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* [Bug c++/84695] New: Missed opportunity to issue warning about override
@ 2018-03-04 6:16 drepper.fsp+rhbz at gmail dot com
2022-01-07 3:56 ` [Bug c++/84695] " pinskia at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: drepper.fsp+rhbz at gmail dot com @ 2018-03-04 6:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84695
Bug ID: 84695
Summary: Missed opportunity to issue warning about override
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: drepper.fsp+rhbz at gmail dot com
Target Milestone: ---
Stroustrup in [1] §20.3.4 writes the compilers should issue warnings about
inconsistent use of explicit override controls.
struct foo {
virtual int one(int) { return 1; }
virtual int two(int) { return 2; }
};
struct bar : foo {
int one(int) override { return 101; }
int two(int) { return 102; }
};
bar b;
In this case the compiler should issue a warning about bar::two.
This is different from -Wsuggest-override. That command line option causes a
warning to be issued but the fact that bar::one uses override should
automatically turn on this type of warnings for the rest of the class. I would
even say there is no need for a further command line option, it should just
been done.
[1] http://www.stroustrup.com/4th.html
>From gcc-bugs-return-596006-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 07:17:07 2018
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From: "bugzilla.gnu at coelho dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/84696] New: internal compiler error: in compute_antic_aux, at tree-ssa-pre.c:2148
Date: Sun, 04 Mar 2018 07:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84696
Bug ID: 84696
Summary: internal compiler error: in compute_antic_aux, at
tree-ssa-pre.c:2148
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: bugzilla.gnu at coelho dot net
Target Milestone: ---
Created attachment 43556
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43556&action=edit
preprocessed source
Compilation of postgresql fails with -fwrapv -O2
sh> gcc --version
gcc (GCC) 8.0.1 20180303 (experimental)
sh> gcc -fwrapv -O2 -c -o localtime.o localtime.i
during GIMPLE pass: pre
localtime.c: In function ‘tzparse’:
localtime.c:897:1: internal compiler error: in compute_antic_aux, at
tree-ssa-pre.c:2148
tzparse(const char *name, struct state *sp, bool lastditch)
^~~~~~~
0xe0b5de compute_antic_aux
../../gcc-trunk-src/gcc/tree-ssa-pre.c:2148
0xe0b5de compute_antic
../../gcc-trunk-src/gcc/tree-ssa-pre.c:2364
0xe0b5de execute
../../gcc-trunk-src/gcc/tree-ssa-pre.c:4131
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
>From gcc-bugs-return-596007-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 08:46:15 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84696] [8 Regression] ICE in compute_antic_aux, at tree-ssa-pre.c:2148
Date: Sun, 04 Mar 2018 08:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84696
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
Status|UNCONFIRMED |NEW
Known to work| |7.3.0
Keywords| |ice-on-valid-code
Last reconfirmed| |2018-03-04
Component|c |tree-optimization
CC| |marxin at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
Summary|internal compiler error: in |[8 Regression] ICE in
|compute_antic_aux, at |compute_antic_aux, at
|tree-ssa-pre.c:2148 |tree-ssa-pre.c:2148
Target Milestone|--- |8.0
Known to fail| |8.0
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with r258124.
I see similar issue:
$ cat ice.i
enum b
{
c,
d
};
struct e
{
enum b code;
};
struct f
{
unsigned g;
};
int h, i;
struct a
{
struct e common;
struct f j;
};
struct a k (void)
{
struct a *l;
do
if (l->common.code == d && l->j.g * 4)
;
else
i = l->j.g | (l->common.code && l);
while (h && l->common.code == c);
}
$ gcc ice.i -c -Ofast
during GIMPLE pass: pre
ice.i: In function 'k':
ice.i:21:10: internal compiler error: in compute_antic_aux, at
tree-ssa-pre.c:2148
struct a k (void)
^
0xd90686 compute_antic_aux
../../gcc/tree-ssa-pre.c:2148
0xd90686 compute_antic
../../gcc/tree-ssa-pre.c:2364
0xd90686 execute
../../gcc/tree-ssa-pre.c:4131
>From gcc-bugs-return-596008-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 10:11:14 2018
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From: "dimhen at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84696] [8 Regression] ICE in compute_antic_aux, at tree-ssa-pre.c:2148
Date: Sun, 04 Mar 2018 10:11:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84696
--- Comment #2 from Dmitry G. Dyachenko <dimhen at gmail dot com> ---
duplicate PR84670?
>From gcc-bugs-return-596009-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 10:30:39 2018
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From: "estellnb at elstel dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84667] unreasonable refusal to use assignment operator method
Date: Sun, 04 Mar 2018 10:30:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84667
--- Comment #8 from Elmar Stellnberger <estellnb at elstel dot org> ---
concerning comment #4: Why do I not get the warning of utf8len being used
uninitialized? I have compiled with -Wall and -Wmaybe-uninitialized. This would
not be the first time that g++ does not notify me about a variable that I have
forgotten to initialize. I have already wasted a lot of time in not knowing
that a certain variable was not initialized in another context.
>From gcc-bugs-return-596010-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 10:37:45 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84667] unreasonable refusal to use assignment operator method
Date: Sun, 04 Mar 2018 10:37:00 -0000
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--- Comment #9 from Elmar Stellnberger <estellnb at elstel dot org> ---
I still do not understand why this constructor gets called: inline xstrbuf(
base_str s ). If I use .as_const() the result should be an xstr_const : public
xstr_abstract<const xchar,xchar> and not an xstr_mutable: public
xstr_abstract<xchar,xchar>. Even if it ascended to xstr_abstract it would have
to discard the const qualifyer.
>From gcc-bugs-return-596011-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 10:41:02 2018
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From: "estellnb at elstel dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84667] unreasonable refusal to use assignment operator method
Date: Sun, 04 Mar 2018 10:41:00 -0000
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--- Comment #10 from Elmar Stellnberger <estellnb at elstel dot org> ---
Created attachment 43557
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43557&action=edit
fixed version of auxtypes.h which works under g++ and clang
Well if I fix things for clang then the code will also do the right thing under
g++. However this does not resolve my initial question.
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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/84697] New: minloc/maxloc not simplified with zero size
Date: Sun, 04 Mar 2018 11:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84697
Bug ID: 84697
Summary: minloc/maxloc not simplified with zero size
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
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Minloc and maxloc simplification are not yet done for zero-sized arrays.
Consider
$ cat minloc_zerosize_1.f90
program main
implicit none
integer, parameter :: z(0) = 0
integer, parameter, dimension(1) :: a = minloc(z)
integer, parameter, dimension(1) :: b = minloc(z,mask=z>0)
integer, parameter :: c = minloc(z,dim=1)
end program main
$ gfortran minloc_zerosize_1.f90
minloc_zerosize_1.f90:4:41:
integer, parameter, dimension(1) :: a = minloc(z)
1
Fehler: Transformierende intrinsische Routine »minloc« bei (1) ist in einem
Initialisierungs-Ausdruck nicht erlaubt
minloc_zerosize_1.f90:5:41:
integer, parameter, dimension(1) :: b = minloc(z,mask=z>0)
1
Fehler: Transformierende intrinsische Routine »minloc« bei (1) ist in einem
Initialisierungs-Ausdruck nicht erlaubt
minloc_zerosize_1.f90:6:27:
integer, parameter :: c = minloc(z,dim=1)
1
Fehler: Transformierende intrinsische Routine »minloc« bei (1) ist in einem
Initialisierungs-Ausdruck nicht erlaubt
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Subject: [Bug fortran/84538] [8 Regression] Array of derived type elements incorrectly accessed in function
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84538
--- Comment #8 from Paul Thomas <pault at gcc dot gnu.org> ---
Fixed on trunk.
Thanks for the report.
Paul
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Subject: [Bug fortran/84538] [8 Regression] Array of derived type elements incorrectly accessed in function
Date: Sun, 04 Mar 2018 11:08:00 -0000
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Paul Thomas <pault at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #9 from Paul Thomas <pault at gcc dot gnu.org> ---
It helps to mark it as RESOLVED!
Paul
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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/84697] minloc/maxloc not simplified with zero size
Date: Sun, 04 Mar 2018 11:11:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-04
Ever confirmed|0 |1
--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Confirmed.
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Subject: [Bug fortran/84697] minloc/maxloc not simplified with zero size
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--- Comment #2 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
There is also a regression here:
$ cat a.f90
program main
implicit none
integer, parameter :: z(0) = 0
print *,minloc(z)
end program main
$ ./a.out
Fortran runtime error: Rank of array needs to be > 0
Error termination. Backtrace:
#0 0x4007eb in ???
#1 0x400871 in ???
#2 0x7ff256574a86 in ???
#3 0x400679 in ???
at ../sysdeps/x86_64/start.S:120
#4 0xffffffffffffffff in ???
$ /usr/bin/gfortran a.f90
$ ./a.out
0
And something that didn't work in gcc7, but for a different reason:
$ cat b.f90
program main
implicit none
integer, parameter :: z(0) = 0
print *,minloc(z,mask=z>0)
end program main
$ gfortran b.f90
$ ./a.out
Fortran runtime error: Rank of array needs to be > 0
Error termination. Backtrace:
#0 0x4007ed in ???
#1 0x400873 in ???
#2 0x7f89d662aa86 in ???
#3 0x400679 in ???
at ../sysdeps/x86_64/start.S:120
#4 0xffffffffffffffff in ???
$ /usr/bin/gfortran b.f90
$ ./a.out
Fortran runtime error: Funny sized logical array
Error termination. Backtrace:
#0 0x40082c in ???
#1 0x4008b2 in ???
#2 0x7f705fcfda86 in ???
#3 0x400699 in ???
at ../sysdeps/x86_64/start.S:120
#4 0xffffffffffffffff in ???
(/usr/bin/gfortran is gcc version 7.3.0 (SUSE Linux) ).
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Subject: [Bug fortran/84697] [8 Regression] minloc/maxloc not simplified with zero size
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid, wrong-code
Blocks| |66128
Target Milestone|--- |8.0
Summary|minloc/maxloc not |[8 Regression]
|simplified with zero size |minloc/maxloc not
| |simplified with zero size
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66128
[Bug 66128] ICE for some intrinsics with zero sized array parameter
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Subject: [Bug c++/84698] New: ICE when using noexcept(noexcept()) declaration on global friend function of template class
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84698
Bug ID: 84698
Summary: ICE when using noexcept(noexcept()) declaration on
global friend function of template class
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: nyronium at genthree dot io
Target Milestone: ---
Created attachment 43558
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43558&action=edit
minimal code example triggering the bug
* Exact gcc version:
Using built-in specs.
COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/7.3.0/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /var/tmp/portage/sys-devel/gcc-7.3.0/work/gcc-7.3.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/7.3.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.3.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.3.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.3.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/include/g++-v7
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/7.3.0/python
--enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--enable-checking=release --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo 7.3.0 p1.0' --disable-esp --enable-libstdcxx-time
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64
--disable-altivec --disable-fixed-point --enable-targets=all --disable-libgcj
--enable-libgomp --disable-libmudflap --disable-libssp --disable-libcilkrts
--disable-libmpx --enable-vtable-verify --enable-libvtv --enable-lto
--without-isl --enable-libsanitizer --enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 7.3.0 (Gentoo 7.3.0 p1.0)
* Command line triggering the bug:
g++ ice_noexcept.cpp
* Output of g++ ice_noexcept.cpp:
ice_noexcept.cpp: In instantiation of ‘template<class ... Args> void
swap(X<Args ...>&, X<Args ...>&)’:
ice_noexcept.cpp:7:14: required from ‘struct X<int, int>’
ice_noexcept.cpp:15:14: required from here
ice_noexcept.cpp:7:14: internal compiler error: in push_access_scope, at
cp/pt.c:228
friend void swap(X<Args...>& a, X<Args...>& b) noexcept(noexcept(a.swap(b)));
^~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.gentoo.org/> for instructions.
* Test with clang++ -std=c++17: accepts the code.
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Subject: [Bug fortran/46897] [OOP] type-bound defined ASSIGNMENT(=) not used for derived type component in intrinsic assign
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
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Subject: [Bug fortran/38319] Memory leaks in allocatable component expressions
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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----------------------------------------------------------------------------
Status|NEW |ASSIGNED
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Subject: [Bug fortran/49636] [F03] ASSOCIATE construct confused with slightly complicated case
Date: Sun, 04 Mar 2018 12:34:00 -0000
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Subject: [Bug fortran/82173] [meta-bug] Parameterized derived type errors
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Subject: [Bug fortran/82753] (PDT) Invalid error for generic interface with different KIND parameter values
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Subject: [Bug fortran/82275] gfortran rejects valid & accepts invalid reference to dimension-remapped type SELECT TYPE selector
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Subject: [Bug fortran/82649] (PDT) Invalid error for assumed parameters in ALLOCATE typespec
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Subject: [Bug fortran/82865] Option -fdec collides with PDT
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Subject: [Bug fortran/82923] Automatic allocation of deferred length character using function result
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Subject: [Bug fortran/82842] (PDT) Constructors do not work
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Subject: [Bug fortran/83275] [PDT] ICE in get_pdt_constructor, at fortran/resolve.c:1185 (and others)
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Subject: [Bug fortran/83646] (PDT) Use statement with PDTs excludes the specific instances.
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Subject: [Bug fortran/65024] [OOP] unlimited polymorphic pointer structure not built when it should be
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Subject: [Bug fortran/83076] [8 Regression] ICE in gfc_deallocate_scalar_with_status, at fortran/trans.c:1598
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Subject: [Bug fortran/80657] [7/8 Regression] Loop in character function declaration
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Subject: [Bug fortran/84219] Failure to generate error for IO of transfer intrinsic, when MOLD has derived type components.
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Subject: [Bug fortran/83898] [6/7 Regression] ICE in gfc_conv_expr_descriptor, at fortran/trans-array.c:7181
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Subject: [Bug fortran/83149] [6- and 7-branches] Missing test for sym->ns->proc_name: crash_signal in toplev.c:325
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Subject: [Bug fortran/40196] [F03] [F08] Type parameter inquiry (str%len, a%kind) and Complex parts (z%re, z%im)
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>From gcc-bugs-return-596039-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 13:56:47 2018
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Subject: [Bug fortran/83076] [8 Regression] ICE in gfc_deallocate_scalar_with_status, at fortran/trans.c:1598
Date: Sun, 04 Mar 2018 13:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83076
--- Comment #12 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Sun Mar 4 13:56:09 2018
New Revision: 258233
URL: https://gcc.gnu.org/viewcvs?rev=258233&root=gcc&view=rev
Log:
2018-03-04 Paul Thomas <pault@gcc.gnu.org>
PR fortran/83076
* resolve.c (resolve_fl_derived0): Add caf_token fields for
allocatable and pointer scalars, when -fcoarray selected.
* trans-types.c (gfc_copy_dt_decls_ifequal): Copy the token
field as well as the backend_decl.
(gfc_get_derived_type): Flag GFC_FCOARRAY_LIB for module
derived types that are not vtypes. Components with caf_token
attribute are pvoid types. For a component requiring it, find
the caf_token field and have the component token field point to
its backend_decl.
PR fortran/83319
*trans-types.c (gfc_get_array_descriptor_base): Add the token
field to the descriptor even when codimen not set.
2018-03-04 Paul Thomas <pault@gcc.gnu.org>
PR fortran/83076
* gfortran.dg/coarray_45.f90 : New test.
PR fortran/83319
* gfortran.dg/coarray_46.f90 : New test.
Added:
branches/gcc-7-branch/gcc/testsuite/gfortran.dg/coarray_45.f90
branches/gcc-7-branch/gcc/testsuite/gfortran.dg/coarray_46.f90
Modified:
branches/gcc-7-branch/gcc/fortran/ChangeLog
branches/gcc-7-branch/gcc/fortran/gfortran.h
branches/gcc-7-branch/gcc/fortran/resolve.c
branches/gcc-7-branch/gcc/fortran/trans-types.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/83319] [7/8 Regression] ICE on use of allocatable component in derived type coarray defined in module
Date: Sun, 04 Mar 2018 13:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83319
--- Comment #6 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Sun Mar 4 13:56:09 2018
New Revision: 258233
URL: https://gcc.gnu.org/viewcvs?rev=258233&root=gcc&view=rev
Log:
2018-03-04 Paul Thomas <pault@gcc.gnu.org>
PR fortran/83076
* resolve.c (resolve_fl_derived0): Add caf_token fields for
allocatable and pointer scalars, when -fcoarray selected.
* trans-types.c (gfc_copy_dt_decls_ifequal): Copy the token
field as well as the backend_decl.
(gfc_get_derived_type): Flag GFC_FCOARRAY_LIB for module
derived types that are not vtypes. Components with caf_token
attribute are pvoid types. For a component requiring it, find
the caf_token field and have the component token field point to
its backend_decl.
PR fortran/83319
*trans-types.c (gfc_get_array_descriptor_base): Add the token
field to the descriptor even when codimen not set.
2018-03-04 Paul Thomas <pault@gcc.gnu.org>
PR fortran/83076
* gfortran.dg/coarray_45.f90 : New test.
PR fortran/83319
* gfortran.dg/coarray_46.f90 : New test.
Added:
branches/gcc-7-branch/gcc/testsuite/gfortran.dg/coarray_45.f90
branches/gcc-7-branch/gcc/testsuite/gfortran.dg/coarray_46.f90
Modified:
branches/gcc-7-branch/gcc/fortran/ChangeLog
branches/gcc-7-branch/gcc/fortran/gfortran.h
branches/gcc-7-branch/gcc/fortran/resolve.c
branches/gcc-7-branch/gcc/fortran/trans-types.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
>From gcc-bugs-return-596040-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 13:58:13 2018
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From: "pault at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/83076] [8 Regression] ICE in gfc_deallocate_scalar_with_status, at fortran/trans.c:1598
Date: Sun, 04 Mar 2018 13:58:00 -0000
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Paul Thomas <pault at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #13 from Paul Thomas <pault at gcc dot gnu.org> ---
Fixed on trunk and 7-branch.
Thanks for the report.
Paul
>From gcc-bugs-return-596041-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 14:01:40 2018
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/82336] [6/7/8 Regression] GCC requires but does not emit defaulted constructors in certain cases
Date: Sun, 04 Mar 2018 14:01:00 -0000
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--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
For reference, testing successfully completed too.
>From gcc-bugs-return-596042-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 14:08:57 2018
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Subject: [Bug target/84277] [8 Regression] A lot of new acats testsuite failures
Date: Sun, 04 Mar 2018 14:08:00 -0000
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|ada |target
--- Comment #12 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Recategorizing.
>From gcc-bugs-return-596043-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 14:18:20 2018
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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/42122] [F03] -fdump-tree-original shows wrong static decl for functions with procptr argument
Date: Sun, 04 Mar 2018 14:18:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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----------------------------------------------------------------------------
Status|NEW |WAITING
--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
With gcc 4.8 up to trunk (8.0) the dump is
setpointer (void (*<T4bb>) () * p)
{
}
MAIN__ ()
{
static void setpointer (void (*<T4bb>) ());
}
Is this eight-year old PR fixed or not?
>From gcc-bugs-return-596044-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 14:20:22 2018
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Subject: [Bug fortran/40978] Use named return value (NRV) for functions returning the result as argument
Date: Sun, 04 Mar 2018 14:20:00 -0000
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--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Six years without any activity. Is there any reason to keep this PR opened?
No feedback in more than two years.
>From gcc-bugs-return-596045-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 14:28:39 2018
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From: "okannen at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/84699] New: discarded value expression of volatile class type shall materialize a temporary
Date: Sun, 04 Mar 2018 14:28:00 -0000
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Bug ID: 84699
Summary: discarded value expression of volatile class type
shall materialize a temporary
Product: gcc
Version: 7.3.1
Status: UNCONFIRMED
Severity: normal
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Component: c++
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Target Milestone: ---
*Description
When a discarded value expression if of class type, a temporary shall be
created by copy construction. This copy construction causes the access to the
value of the copied object.
Example:
struct s{
int i;
s()=default;
s(const volatile s& o):i{o.i}{}
};
struct s1{
int i;
};
volatile s as;
volatile s1 as1;
void test(){
as; //should call the copy constructor of s
as1; //should not compile
(void)as; //should call the copy constructor of s
(void)as1; //should not compile
(as,as); //should call twice the copy constructor of s
(as1,as1); //should not compile
}
Remark: Neither Clang nor MSVC behave according to the standard.
*Standard requirement:
**Since at least C++11,[expr].11
(https://timsong-cpp.github.io/cppwp/n4140/expr#11):
In some contexts, an expression only appears for its side effects. Such an
expression is called a discarded-value expression. The expression is evaluated
and its value is discarded. The array-to-pointer ([conv.array]) and
function-to-pointer ([conv.func]) standard conversions are not applied. The
lvalue-to-rvalue conversion ([conv.lval]) is applied if and only if the
expression is a glvalue of volatile-qualified type and it is one of the
following:[...]
**Since C++14 standard a Note has been added to this which is explicit
(https://timsong-cpp.github.io/cppwp/n4659/expr#12):
[[...] If the lvalue is of class type, it must have a volatile copy
constructor to initialize the temporary that is the result of the
lvalue-to-rvalue conversion.]
>From gcc-bugs-return-596046-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 14:35:09 2018
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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/84697] [8 Regression] minloc/maxloc not simplified with zero size
Date: Sun, 04 Mar 2018 14:35:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |kargl at gcc dot gnu.org
--- Comment #3 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Something is rotten in the state of gfc_simplify_expr.
Adding
Index: simplify.c
===================================================================
--- simplify.c (Revision 258232)
+++ simplify.c (Arbeitskopie)
@@ -230,6 +230,7 @@
return x;
}
+void gfc_debug_expr (gfc_expr *);
/* Test that the expression is a constant array, simplifying if
we are dealing with a parameter array. */
@@ -242,9 +243,11 @@
if (e == NULL)
return true;
+ gfc_debug_expr (e);
if (e->expr_type == EXPR_VARIABLE && e->rank > 0
&& e->symtree->n.sym->attr.flavor == FL_PARAMETER)
gfc_simplify_expr (e, 1);
+ gfc_debug_expr (e);
if (e->expr_type != EXPR_ARRAY || !gfc_is_constant_expr (e))
return false;
on a.f90 below yields
main:z(FULL)
0
but the 0 output after simplification seems to be wrong:
show_expr (p=0x11ec2780) at ../../trunk/gcc/fortran/dump-parse-tree.c:388
388 if (p == NULL)
(gdb) p *p
$1 = {expr_type = EXPR_CONSTANT, ts = {type = BT_INTEGER, kind = 4, u =
{derived = 0x0, cl = 0x0, pad = 0}, interface = 0x0, is_c_interop = 0,
is_iso_c = 0, f90_type = BT_UNKNOWN, deferred = false, interop_kind = 0x0},
rank = 1, shape = 0x0, symtree = 0x0, ref = 0x0, where = {
nextc = 0x11ec0378, lb = 0x11ec02e0},
(gdb) p p->rank
$2 = 1
(gdb) p p->shape
$3 = (mpz_t *) 0x0
Note that this works correctly:
program main
implicit none
integer, parameter :: z(0) = [integer::]
print *,minloc(z)
end program main
This yields (correctly)
(gdb) p *p
$1 = {expr_type = EXPR_ARRAY, ts = {type = BT_INTEGER, kind = 4, u = {derived =
0x0, cl = 0x0, pad = 0}, interface = 0x0, is_c_interop = 0, is_iso_c = 0,
f90_type = BT_UNKNOWN, deferred = false, interop_kind = 0x11d41be0
<file_changes_cur>}, rank = 1, shape = 0x11ea8610, symtree = 0x0, ref = 0x0,
where = {nextc = 0x11ec0378, lb = 0x11ec02e0},
Steve, this may also be the root cause of the other problems in PR66128.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/33097] Function decl trees without proper argument list
Date: Sun, 04 Mar 2018 15:22:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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----------------------------------------------------------------------------
Status|NEW |WAITING
--- Comment #19 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> This was due to the following TODO in gfc_get_symbol_for_expr():
> /* TODO: proper argument lists for external intrinsics. */
This has disappeared from the sources since at least gcc5.
In addition I see:
gcc/fortran/ChangeLog-2011: * trans.h (gfc_chainon_list): Delete.
gcc/fortran/ChangeLog-2011: * trans.c (gfc_chainon_list): Delete.
So the patch in comment 10 is now irrelevant.
Without feedback I'll close this PR as INVALID.
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----------------------------------------------------------------------------
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CC| |jb at gcc dot gnu.org
--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Comment 0 is no longer true for trunk (8.0). What should be done with this PR?
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Subject: [Bug fortran/66128] ICE for some intrinsics with zero sized array parameter
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kargl at gcc dot gnu.org changed:
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--- Comment #13 from kargl at gcc dot gnu.org ---
unassign myself
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Subject: [Bug middle-end/21161] [6/7/8 Regression] "clobbered by longjmp" warning ignores the data flow
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--- Comment #14 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to Peter Bergner from comment #13)
> In case you haven't creduce'd the test case yet, here's what I got:
Of course that's a totally bogus test case given what Bruno was trying to
prove, namely that obj is never updated between the setjmp call and the call to
longjmp, therefor we shouldn't get a warning. I think the following test case
does show what Bruno was trying to prove.
bergner@pike:~/gcc/BUGS/PR21161$ cat bug.c
#include <setjmp.h>
typedef struct { long a; } * b;
b global_obj;
void
c (b obj)
{
jmp_buf env;
if (setjmp(env) != 0)
obj = global_obj;
if (obj->a)
longjmp (env, 1);
}
bergner@pike:~/gcc/BUGS/PR21161$
/home/bergner/gcc/build/gcc-fsf-mainline-debug/gcc/xgcc
-B/home/bergner/gcc/build/gcc-fsf-mainline-debug/gcc -W -O1 -S bug.c
bug.c: In function ‘c’:
bug.c:7:6: warning: argument ‘obj’ might be clobbered by ‘longjmp’ or ‘vfork’
[-Wclobbered]
c (b obj)
~~^~~
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|ICE in gfortran 4.6.3, |heap-use-after-free with
|x86_64 |instrumented compiler
--- Comment #13 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Still present at revision r257960. Changed the summary.
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Subject: [Bug fortran/58200] Option fcheck is misleadingly located in option descriptions
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Taking.
>From gcc-bugs-return-596053-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 17:40:01 2018
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Subject: [Bug c++/71569] [6 regression] Crash: External definition of template member from template struct
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--- Comment #14 from Oliver Tale-Yazdi <oliver.tale at web dot de> ---
So can we close this?
You actually fixed two bugs, should I open a second report for the decltype bug
(accepts-invalid) and link it here as solved?
I dont really know how bugzilla is used here.
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Subject: [Bug fortran/66128] ICE for some intrinsics with zero sized array parameter
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Subject: [Bug fortran/58618] Wrong code with character substring and ASSOCIATE
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Summary|ICE with character |Wrong code with character
|substring and ASSOCIATE |substring and ASSOCIATE
Known to fail|4.8.1, 4.9.0 |6.4.0, 7.3.0, 8.0
--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> I have submitted a patch that fixed PR fortran/58991 and
> PR fortran/58992. That patch fixes the ICE, but leads
> to wrong code. Update keywords to reflect the change in
> the problem.
Changed the summary accordingly.
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |WAITING
--- Comment #10 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
On x86_64-apple-darwin* I cannot reproduce any failure starting with 5.5.0 up
to trunk (8.0):
% gfortran-fsf-5 pr59298.f90 -fsanitize=address,undefined -std=f2008
-static-libgfortran -fcheck=all -Ofast
% ./a.out
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Subject: [Bug fortran/34742] Document the kind of integer passed for string lengths
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Janne Blomqvist <jb at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Janne Blomqvist <jb at gcc dot gnu.org> ---
It's documented in the manual, and the changes for release 8 have been
documented in the changes.html and the wiki. Closing as fixed.
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Subject: [Bug fortran/61180] surprising -Wsurprising warning
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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----------------------------------------------------------------------------
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Assignee|unassigned at gcc dot gnu.org |dominiq at lps dot ens.fr
--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Let me take it to look to comment 3.
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Subject: [Bug fortran/59298] ICE when initialising PARAMETER array of derived-type (containing an array) using array constructor
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Last reconfirmed|2013-11-26 00:00:00 |2018-3-4
--- Comment #11 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Test case from comment#4 passes, test case from comment#9 ICEs:
ig25@linux-d6cw:/tmp> cat a.f90
program p
type t
integer :: m(1,1)
end type
type(t), parameter :: x(1) = [ t(789) ]
integer :: f(1,1)
f = (x(1)%m)
print *, f
end
ig25@linux-d6cw:/tmp> gfortran a.f90
f951: interner Compiler-Fehler: Speicherzugriffsfehler
0xd5b70f crash_signal
../../trunk/gcc/toplev.c:325
0x7db0db gfc_clear_shape(__mpz_struct (*) [1], int)
../../trunk/gcc/fortran/expr.c:412
0x7db0db gfc_free_shape(__mpz_struct (**) [1], int)
../../trunk/gcc/fortran/expr.c:422
0x7db217 free_expr0
../../trunk/gcc/fortran/expr.c:503
0x7db3d0 gfc_replace_expr(gfc_expr*, gfc_expr*)
../../trunk/gcc/fortran/expr.c:615
0x7de9c8 simplify_const_ref
../../trunk/gcc/fortran/expr.c:1796
0x7def2d gfc_simplify_expr(gfc_expr*, int)
../../trunk/gcc/fortran/expr.c:2004
0x7df04d simplify_parameter_variable
../../trunk/gcc/fortran/expr.c:1869
0x7def0e gfc_simplify_expr(gfc_expr*, int)
../../trunk/gcc/fortran/expr.c:1976
0x7dea92 simplify_intrinsic_op
../../trunk/gcc/fortran/expr.c:1105
0x7dea92 gfc_simplify_expr(gfc_expr*, int)
../../trunk/gcc/fortran/expr.c:1965
0x84a8a9 resolve_operator
../../trunk/gcc/fortran/resolve.c:4158
0x84a8a9 gfc_resolve_expr(gfc_expr*)
../../trunk/gcc/fortran/resolve.c:6702
0x841dc1 gfc_resolve_code(gfc_code*, gfc_namespace*)
../../trunk/gcc/fortran/resolve.c:11092
0x844eef resolve_codes
../../trunk/gcc/fortran/resolve.c:16516
0x844fbe gfc_resolve(gfc_namespace*)
../../trunk/gcc/fortran/resolve.c:16551
0x832e20 resolve_all_program_units
../../trunk/gcc/fortran/parse.c:6060
0x832e20 gfc_parse_file()
../../trunk/gcc/fortran/parse.c:6310
0x87950f gfc_be_parse_file
../../trunk/gcc/fortran/f95-lang.c:204
Bitte senden Sie einen vollständigen Fehlerbericht auf Englisch ein;
inclusive vorverarbeitetem Quellcode, wenn es dienlich ist.
Please include the complete backtrace with any bug report.
Weitere Hinweise finden Sie unter »<https://gcc.gnu.org/bugs/>«.
So, we should probably commit the test case from #4.
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Subject: [Bug fortran/59298] ICE when initialising PARAMETER array of derived-type (containing an array) using array constructor
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--- Comment #12 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
I can only get the ICE with an instrumented compiler.
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Subject: [Bug fortran/28154] SPREAD (and friends) on unallocated arrays
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--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Related to/Duplicate of pr36683?
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Subject: [Bug c++/84667] unreasonable refusal to use assignment operator method
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Elmar Stellnberger <estellnb at elstel dot org> changed:
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----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|INVALID |---
--- Comment #11 from Elmar Stellnberger <estellnb at elstel dot org> ---
Why does my gcc not report uninitialized variables. Is the version too old
(6.3.0 20170516)?
Still I do not know how g++ can convert an xstr_const into an xstr_mutable.
That should be impossible as stated in the comment above. Thus the fact that
correcting an error reported by clang has made the program behave correctly
under g++ is simply astonishing. However I have no idea why g++ behaves like
this.
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Subject: [Bug tree-optimization/84670] [8 Regression] ICE: in compute_antic_aux, at tree-ssa-pre.c:2148 with -O2 -fno-tree-dominator-opts
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Gerald Pfeifer <gerald at pfeifer dot com> changed:
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----------------------------------------------------------------------------
CC| |gerald at pfeifer dot com
--- Comment #6 from Gerald Pfeifer <gerald at pfeifer dot com> ---
Created attachment 43559
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43559&action=edit
A testcase from Wine (fairly bigger)
This is a testcase from a full Wine build. The others probably are
better to nail this down, but for verification just in case a first
fix addresses those but might not cover this one as well.
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--- Comment #13 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
This still segfaults:
ig25@linux-d6cw:/tmp> cat a.f90
implicit none
type Plane
integer :: M(1,1)
end type
type(Plane), parameter :: planes(1) = [ Plane(1) ]
integer :: f(1,1)
f = (planes(1)%M)
if (f(1,1) /= 1) stop 1
end program
ig25@linux-d6cw:/tmp> gfortran a.f90
f951: interner Compiler-Fehler: Speicherzugriffsfehler
0xd5b70f crash_signal
../../trunk/gcc/toplev.c:325
0x7db0db gfc_clear_shape(__mpz_struct (*) [1], int)
../../trunk/gcc/fortran/expr.c:412
0x7db0db gfc_free_shape(__mpz_struct (**) [1], int)
../../trunk/gcc/fortran/expr.c:422
0x7db217 free_expr0
../../trunk/gcc/fortran/expr.c:503
0x7db3d0 gfc_replace_expr(gfc_expr*, gfc_expr*)
../../trunk/gcc/fortran/expr.c:615
0x7de9c8 simplify_const_ref
../../trunk/gcc/fortran/expr.c:1796
0x7def2d gfc_simplify_expr(gfc_expr*, int)
../../trunk/gcc/fortran/expr.c:2004
0x7df04d simplify_parameter_variable
../../trunk/gcc/fortran/expr.c:1869
0x7def0e gfc_simplify_expr(gfc_expr*, int)
../../trunk/gcc/fortran/expr.c:1976
0x7dea92 simplify_intrinsic_op
../../trunk/gcc/fortran/expr.c:1105
0x7dea92 gfc_simplify_expr(gfc_expr*, int)
../../trunk/gcc/fortran/expr.c:1965
0x84a8a9 resolve_operator
../../trunk/gcc/fortran/resolve.c:4158
0x84a8a9 gfc_resolve_expr(gfc_expr*)
../../trunk/gcc/fortran/resolve.c:6702
0x841dc1 gfc_resolve_code(gfc_code*, gfc_namespace*)
../../trunk/gcc/fortran/resolve.c:11092
0x844eef resolve_codes
../../trunk/gcc/fortran/resolve.c:16516
0x844fbe gfc_resolve(gfc_namespace*)
../../trunk/gcc/fortran/resolve.c:16551
0x832e20 resolve_all_program_units
../../trunk/gcc/fortran/parse.c:6060
0x832e20 gfc_parse_file()
../../trunk/gcc/fortran/parse.c:6310
0x87950f gfc_be_parse_file
../../trunk/gcc/fortran/f95-lang.c:204
Bitte senden Sie einen vollständigen Fehlerbericht auf Englisch ein;
inclusive vorverarbeitetem Quellcode, wenn es dienlich ist.
Please include the complete backtrace with any bug report.
Weitere Hinweise finden Sie unter »<https://gcc.gnu.org/bugs/>«.
So, a bit too early to commit a test case :-)
>From gcc-bugs-return-596065-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 21:02:24 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/84697] [8 Regression] minloc/maxloc not simplified with zero size
Date: Sun, 04 Mar 2018 21:02:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |tkoenig at gcc dot gnu.org
--- Comment #4 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Created attachment 43560
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43560&action=edit
First attempt...
Well, here is something that fixes the first test case, at least.
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Subject: [Bug tree-optimization/28364] poor optimization choices when iterating over a std::string (probably not c++-specific)
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bin.cheng <amker.cheng at gmail dot com> changed:
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--- Comment #31 from bin.cheng <amker.cheng at gmail dot com> ---
This is a really old issue! I will also check status of this issue on trunk.
>From gcc-bugs-return-596067-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 21:33:37 2018
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Subject: [Bug fortran/59298] ICE when initialising PARAMETER array of derived-type (containing an array) using array constructor
Date: Sun, 04 Mar 2018 21:33:00 -0000
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
CC| |kargl at gcc dot gnu.org
Blocks| |84693
--- Comment #14 from kargl at gcc dot gnu.org ---
Added PR 84693 as blocked. The code is in 84693 is similar, but
the RHS of the expression is a scalar DT and LHS is an array of
the DT.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84693
[Bug 84693] scalar DT not broadcast across an array in an initialization
expression
>From gcc-bugs-return-596068-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 21:35:18 2018
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Subject: [Bug c++/81700] Unresolved function type when taking address of operator() of generic lambda
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--- Comment #1 from Guillaume Racicot <gufideg at gmail dot com> ---
Still happen with 7.3 and trunk on godbolt: https://godbolt.org/g/xXUn1v
>From gcc-bugs-return-596069-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Mar 04 22:06:35 2018
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Subject: [Bug fortran/31009] Generate conditional code to assign arrays, depending on their stride
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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Status|NEW |WAITING
--- Comment #6 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Eleven years later does it make sense to keep this PR opened? Should not the
CONTIGUOUS attribute do the trick now?
>From gcc-bugs-return-596070-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 00:24:55 2018
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/84618] [8 Regression] ICE in build_capture_proxy, at cp/lambda.c:460
Date: Mon, 05 Mar 2018 00:24:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Looking into it.
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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/84700] New: ICE on 32-bit BE powerpc targets w/ -misel -O1
Date: Mon, 05 Mar 2018 02:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84700
Bug ID: 84700
Summary: ICE on 32-bit BE powerpc targets w/ -misel -O1
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
Target: powerpc-*-linux-gnu*, powerpcspe-*-linux-gnu*
gcc from 5 to at least gcc-8.0.0-alpha20180225 snapshot (r257975) inclusive ICE
when compiling the following snippet w/ -misel -O1:
long long int
bk (long long int wi)
{
long long int d0 = wi < 2;
int ga = d0 >= 0;
return d0 + ((wi == 0) ? d0 : ga);
}
% powerpc-e300c3-linux-gnu-gcc-8.0.0-alpha20180225 -misel -O1 -c afkfiar3.c
powerpc-e300c3-linux-gnu-gcc-8.0.0-alpha20180225: internal compiler error:
Segmentation fault signal terminated program cc1
(gdb) where
#0 0x0000000000c24d51 in simplify_const_binary_operation (code=PLUS,
mode=E_SImode, op0=0x7fffea8142a0, op1=0x7fffea8151f8)
at
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180225/work/gcc-8-20180225/gcc/simplify-rtx.c:4032
Backtrace stopped: Cannot access memory at address 0x7ffffbffef50
And gcc 5.4.0:
(gdb) where 10
#0 0x00005555558db8aa in wi::storage_ref::storage_ref(long const*, unsigned
int, unsigned int) ()
#1 0x0000555555906622 in wi::int_traits<generic_wide_int<wide_int_storage>
>::decompose(long*, unsigned int, generic_wide_int<wide_int_storage> const&) ()
#2 0x0000555555905df6 in
wide_int_ref_storage<false>::wide_int_ref_storage<generic_wide_int<wide_int_storage>
>(generic_wide_int<wide_int_storage> const&) ()
#3 0x000055555590572f in generic_wide_int<wide_int_ref_storage<false>
>::generic_wide_int<generic_wide_int<wide_int_storage>
>(generic_wide_int<wide_int_storage> const&) ()
#4 0x0000555555f95aa0 in ?? ()
#5 0x0000555555f95fcf in simplify_subreg(machine_mode, rtx_def*, machine_mode,
unsigned int) ()
#6 0x0000555555f96b54 in simplify_gen_subreg(machine_mode, rtx_def*,
machine_mode, unsigned int) ()
#7 0x00005555565dac73 in ?? ()
#8 0x00005555565da604 in ?? ()
#9 0x00005555565cf80b in ?? ()
(More stack frames follow...)
It looks similar to PR81288 but still reproduces for both powerpc and
powerpcspe.
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Subject: [Bug c++/84701] New: casting to ( typeof(variable) ) gives wrong results
Date: Mon, 05 Mar 2018 06:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84701
Bug ID: 84701
Summary: casting to ( typeof(variable) ) gives wrong results
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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typedef short foo_t;
foo_t s = -1; /* FFFF */
unsigned u = (unsigned foo_t)s; /* result is FFFF */
unsigned u = (unsigned typeof(s))s; /* result is FFFFFFFF */
There is no warning using g++ -Wall -W.
It would be nice if using typeof(var) in a cast would either work, or cause a
compiler error!
>From gcc-bugs-return-596073-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 06:46:16 2018
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Subject: [Bug c++/84702] New: internal compiler error: in tsubst_copy, at cp/pt.c:15082
Date: Mon, 05 Mar 2018 06:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84702
Bug ID: 84702
Summary: internal compiler error: in tsubst_copy, at
cp/pt.c:15082
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vegard.nossum at gmail dot com
CC: webrown.cpp at gmail dot com
Target Milestone: ---
Input:
void a();
namespace {
void a();
}
template<int b = a>
void a() {
a();
}
Output:
$ xgcc -x c++ -S -
<stdin>: In substitution of 'template<int b> void a() [with int b =
<missing>]':
<stdin>:9:4: required from here
<stdin>:7:18: internal compiler error: in tsubst_copy, at cp/pt.c:15082
0x10e95f7 tsubst_copy
/home/vegard/git/gcc/gcc/cp/pt.c:15082
0x10f7da3 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
/home/vegard/git/gcc/gcc/cp/pt.c:17570
0x10c11c6 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/vegard/git/gcc/gcc/cp/pt.c:16984
0x112fffa tsubst_template_arg
/home/vegard/git/gcc/gcc/cp/pt.c:11071
0x112fffa type_unification_real
/home/vegard/git/gcc/gcc/cp/pt.c:19977
0x119c519 fn_type_unification(tree_node*, tree_node*, tree_node*, tree_node*
const*, unsigned int, tree_node*, unification_kind_t, int, bool, bool)
/home/vegard/git/gcc/gcc/cp/pt.c:19165
0x907d89 add_template_candidate_real
/home/vegard/git/gcc/gcc/cp/call.c:3180
0x90af6c add_template_candidate
/home/vegard/git/gcc/gcc/cp/call.c:3258
0x90af6c add_candidates
/home/vegard/git/gcc/gcc/cp/call.c:5525
0x9388a9 perform_overload_resolution
/home/vegard/git/gcc/gcc/cp/call.c:4203
0x9388a9 build_new_function_call(tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
/home/vegard/git/gcc/gcc/cp/call.c:4272
0x1281cd6 finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**,
bool, bool, int)
/home/vegard/git/gcc/gcc/cp/semantics.c:2493
0xf7bb98 cp_parser_postfix_expression
/home/vegard/git/gcc/gcc/cp/parser.c:7244
0xf2e927 cp_parser_unary_expression
/home/vegard/git/gcc/gcc/cp/parser.c:8320
0xec435a cp_parser_cast_expression
/home/vegard/git/gcc/gcc/cp/parser.c:9088
0xec6986 cp_parser_binary_expression
/home/vegard/git/gcc/gcc/cp/parser.c:9189
0xeca75a cp_parser_assignment_expression
/home/vegard/git/gcc/gcc/cp/parser.c:9484
0xece6c6 cp_parser_expression
/home/vegard/git/gcc/gcc/cp/parser.c:9653
0xee2c46 cp_parser_expression_statement
/home/vegard/git/gcc/gcc/cp/parser.c:11129
0xefe550 cp_parser_statement
/home/vegard/git/gcc/gcc/cp/parser.c:10933
$ xgcc --version
xgcc (GCC) 8.0.1 20180303 (experimental)
Built from git 0d86c284d085d29782d862600a79aa1ff0ee0c47 (r258221).
Could be related to bug #79271 based on the crash message, although I don't see
(a) any constexpr in my test case, (b) any arrays in my test case, (c) any
crash with the test case from that bug on my local compiler.
Test case was minimised by C-Reduce.
>From gcc-bugs-return-596074-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 07:02:25 2018
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Subject: [Bug c++/84703] New: internal compiler error: in cxx_eval_bare_aggregate, at cp/constexpr.c:2810
Date: Mon, 05 Mar 2018 07:02:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84703
Bug ID: 84703
Summary: internal compiler error: in cxx_eval_bare_aggregate,
at cp/constexpr.c:2810
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Keywords: ice-on-invalid-code
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vegard.nossum at gmail dot com
CC: webrown.cpp at gmail dot com
Target Milestone: ---
Input:
template<int x>
void a() {
const int c({__builtin_FUNCTION()}, __builtin_LINE());
}
Output:
$ xgcc -x c++ -S -
<stdin>: In function 'void a()':
<stdin>:3:55: warning: list-initializer for non-class type must not be
parenthesized
<stdin>:3:55: error: expression list treated as compound expression in
initializer [-fpermissive]
<stdin>:3:55: internal compiler error: in cxx_eval_bare_aggregate, at
cp/constexpr.c:2810
0xa3ac67 cxx_eval_bare_aggregate
/home/vegard/git/gcc/gcc/cp/constexpr.c:2810
0xa3ac67 cxx_eval_constant_expression
/home/vegard/git/gcc/gcc/cp/constexpr.c:4535
0xa33b44 cxx_eval_constant_expression
/home/vegard/git/gcc/gcc/cp/constexpr.c:4564
0xa35825 cxx_eval_constant_expression
/home/vegard/git/gcc/gcc/cp/constexpr.c:4399
0xa4de8a cxx_eval_outermost_constant_expr
/home/vegard/git/gcc/gcc/cp/constexpr.c:4830
0xa5e2bb fold_non_dependent_expr(tree_node*)
/home/vegard/git/gcc/gcc/cp/constexpr.c:5113
0x142dbd7 store_init_value(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
/home/vegard/git/gcc/gcc/cp/typeck2.c:825
0xb49988 check_initializer
/home/vegard/git/gcc/gcc/cp/decl.c:6422
0xbe1ec6 cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
/home/vegard/git/gcc/gcc/cp/decl.c:6975
0xfa4c59 cp_parser_init_declarator
/home/vegard/git/gcc/gcc/cp/parser.c:19729
0xfa99d7 cp_parser_simple_declaration
/home/vegard/git/gcc/gcc/cp/parser.c:13063
0xfafbc8 cp_parser_block_declaration
/home/vegard/git/gcc/gcc/cp/parser.c:12881
0xfb2094 cp_parser_declaration_statement
/home/vegard/git/gcc/gcc/cp/parser.c:12474
0xefef9b cp_parser_statement
/home/vegard/git/gcc/gcc/cp/parser.c:10923
0xf02a5b cp_parser_statement_seq_opt
/home/vegard/git/gcc/gcc/cp/parser.c:11272
0xf034fa cp_parser_compound_statement
/home/vegard/git/gcc/gcc/cp/parser.c:11226
0xf96a6b cp_parser_function_body
/home/vegard/git/gcc/gcc/cp/parser.c:21776
0xf96a6b cp_parser_ctor_initializer_opt_and_function_body
/home/vegard/git/gcc/gcc/cp/parser.c:21811
0xf9fc75 cp_parser_function_definition_after_declarator
/home/vegard/git/gcc/gcc/cp/parser.c:26816
0xfa62cd cp_parser_function_definition_from_specifiers_and_declarator
/home/vegard/git/gcc/gcc/cp/parser.c:26733
$ xgcc --version
xgcc (GCC) 8.0.1 20180303 (experimental)
Built from git 0d86c284d085d29782d862600a79aa1ff0ee0c47 (r258221).
Test case was minimised by C-Reduce.
>From gcc-bugs-return-596075-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 07:24:17 2018
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From: "vegard.nossum at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84704] New: internal compiler error: gimplification failed
Date: Mon, 05 Mar 2018 07:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84704
Bug ID: 84704
Summary: internal compiler error: gimplification failed
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vegard.nossum at gmail dot com
CC: webrown.cpp at gmail dot com
Target Milestone: ---
Input:
int a[]{0};
void b() {
a[({0;})] %= 0;
}
Output:
$ xgcc -x c++ -S -g -O3 -
<stdin>: In function 'void b()':
<stdin>:4:12: warning: division by zero [-Wdiv-by-zero]
gimplification failed:
<statement_list 0x7f364780a8c0
type <void_type 0x7f36476b5f18 void VOID
align:8 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7f36476b5f18
pointer_to_this <pointer_type 0x7f36476bd0a8>>
head (nil) tail (nil) stmts
>
<stdin>:4:12: internal compiler error: gimplification failed
0x2224a63 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
/home/vegard/git/gcc/gcc/gimplify.c:12393
0x223d389 gimplify_compound_lval
/home/vegard/git/gcc/gcc/gimplify.c:2984
0x221c759 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
/home/vegard/git/gcc/gcc/gimplify.c:11387
0x227970c gimplify_modify_expr
/home/vegard/git/gcc/gcc/gimplify.c:5642
0x221e676 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
/home/vegard/git/gcc/gcc/gimplify.c:11435
0x222b991 gimplify_stmt(tree_node**, gimple**)
/home/vegard/git/gcc/gcc/gimplify.c:6658
0x221da9d gimplify_cleanup_point_expr
/home/vegard/git/gcc/gcc/gimplify.c:6400
0x221da9d gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
/home/vegard/git/gcc/gcc/gimplify.c:11811
0x222b991 gimplify_stmt(tree_node**, gimple**)
/home/vegard/git/gcc/gcc/gimplify.c:6658
0x221f1fb gimplify_statement_list
/home/vegard/git/gcc/gcc/gimplify.c:1767
0x221f1fb gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
/home/vegard/git/gcc/gcc/gimplify.c:11863
0x222b991 gimplify_stmt(tree_node**, gimple**)
/home/vegard/git/gcc/gcc/gimplify.c:6658
0x2234c59 gimplify_body(tree_node*, bool)
/home/vegard/git/gcc/gcc/gimplify.c:12635
0x2236fb0 gimplify_function_tree(tree_node*)
/home/vegard/git/gcc/gcc/gimplify.c:12800
0x19a3517 cgraph_node::analyze()
/home/vegard/git/gcc/gcc/cgraphunit.c:670
0x19b65eb analyze_functions
/home/vegard/git/gcc/gcc/cgraphunit.c:1131
0x19bb301 symbol_table::finalize_compilation_unit()
/home/vegard/git/gcc/gcc/cgraphunit.c:2691
$ xgcc --version
xgcc (GCC) 8.0.1 20180303 (experimental)
Built from git 0d86c284d085d29782d862600a79aa1ff0ee0c47 (r258221).
I am not sure if the code is invalid or not -- for sure div-by-0 is UB at run
time, but I think it should be fine to compile this?
Test case was minimised by C-Reduce.
>From gcc-bugs-return-596076-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 07:31:34 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84704] internal compiler error: gimplification failed
Date: Mon, 05 Mar 2018 07:31:00 -0000
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--- Comment #1 from Vegard Nossum <vegard.nossum at gmail dot com> ---
I should add that both -g and (one of) -Os/-O1/-O2/-O3 seems necessary for the
ICE to trigger. Also, it seems that 7.3.0 works by emitting this for -O1:
b():
mov eax, DWORD PTR a[rip]
mov ecx, 0
cdq
idiv ecx
mov DWORD PTR a[rip], edx
ret
a:
.zero 4
and this for -O2:
b():
ud2
a:
.zero 4
>From gcc-bugs-return-596077-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:01:36 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84694] [8 Regression] internal compiler error: tree check: expected tree that contains 'decl minimal' structure, have 'identifier_node' in do_friend, at cp/friend.c:498
Date: Mon, 05 Mar 2018 08:01:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |error-recovery
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-05
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |8.0
Summary|internal compiler error: |[8 Regression] internal
|tree check: expected tree |compiler error: tree check:
|that contains 'decl |expected tree that contains
|minimal' structure, have |'decl minimal' structure,
|'identifier_node' in |have 'identifier_node' in
|do_friend, at |do_friend, at
|cp/friend.c:498 |cp/friend.c:498
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-596078-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:09:45 2018
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Subject: [Bug c++/84694] [8 Regression] internal compiler error: tree check: expected tree that contains 'decl minimal' structure, have 'identifier_node' in do_friend, at cp/friend.c:498
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |nathan at gcc dot gnu.org
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r248108.
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Subject: [Bug c++/84694] [8 Regression] internal compiler error: tree check: expected tree that contains 'decl minimal' structure, have 'identifier_node' in do_friend, at cp/friend.c:498
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
>From gcc-bugs-return-596080-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:12:00 2018
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Subject: [Bug c++/84702] [8 Regression] internal compiler error: in tsubst_copy, at cp/pt.c:15082
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-invalid-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-05
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |8.0
Summary|internal compiler error: in |[8 Regression] internal
|tsubst_copy, at |compiler error: in
|cp/pt.c:15082 |tsubst_copy, at
| |cp/pt.c:15082
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-596081-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:14:24 2018
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Subject: [Bug c++/84702] [8 Regression] internal compiler error: in tsubst_copy, at cp/pt.c:15082
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |nathan at gcc dot gnu.org
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r248250.
>From gcc-bugs-return-596082-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:16:13 2018
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Subject: [Bug c++/84703] internal compiler error: in cxx_eval_bare_aggregate, at cp/constexpr.c:2810
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-05
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Even 4.8 ICEs.
>From gcc-bugs-return-596083-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:19:40 2018
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Subject: [Bug c++/84703] internal compiler error: in cxx_eval_bare_aggregate, at cp/constexpr.c:2810
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Appeared with r191290.
>From gcc-bugs-return-596084-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:21:26 2018
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Subject: [Bug c++/84704] [8 Regression] internal compiler error: gimplification failed
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-05
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |8.0
Summary|internal compiler error: |[8 Regression] internal
|gimplification failed |compiler error:
| |gimplification failed
Ever confirmed|0 |1
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-596085-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:23:41 2018
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |aoliva at gcc dot gnu.org
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r255947.
>From gcc-bugs-return-596086-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:26:43 2018
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Subject: [Bug c++/84691] [6/7/8 Regression] internal compiler error: in poplevel_class, at cp/name-lookup.c:4430
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84691
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-05
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |6.5
Summary|internal compiler error: in |[6/7/8 Regression] internal
|poplevel_class, at |compiler error: in
|cp/name-lookup.c:4430 |poplevel_class, at
| |cp/name-lookup.c:4430
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
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Subject: [Bug c++/84705] New: internal compiler error: in add_stmt, at cp/semantics.c:390
Date: Mon, 05 Mar 2018 08:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84705
Bug ID: 84705
Summary: internal compiler error: in add_stmt, at
cp/semantics.c:390
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Keywords: ice-on-invalid-code
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vegard.nossum at gmail dot com
CC: webrown.cpp at gmail dot com
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Input:
int a[]{a};
template<int>
struct b {
__attribute__((c([] {
struct {
int a = static_cast<struct d>(a);
} e;
})));
};
Output:
$ xgcc -x c++ -S -
<stdin>:1:10: error: invalid conversion from 'int*' to 'int' [-fpermissive]
<stdin>:7:34: internal compiler error: in add_stmt, at cp/semantics.c:390
0x125ac1b add_stmt(tree_node*)
/home/vegard/git/gcc/gcc/cp/semantics.c:390
0xe67cab do_pushtag
/home/vegard/git/gcc/gcc/cp/name-lookup.c:6475
0xe67cab pushtag(tree_node*, tree_node*, tag_scope)
/home/vegard/git/gcc/gcc/cp/name-lookup.c:6514
0xb63cd5 xref_tag_1
/home/vegard/git/gcc/gcc/cp/decl.c:13724
0xb63cd5 xref_tag(tag_types, tree_node*, tag_scope, bool)
/home/vegard/git/gcc/gcc/cp/decl.c:13781
0xf87b9d cp_parser_elaborated_type_specifier
/home/vegard/git/gcc/gcc/cp/parser.c:17916
0xf26acc cp_parser_type_specifier
/home/vegard/git/gcc/gcc/cp/parser.c:16800
0xf2af47 cp_parser_type_specifier_seq
/home/vegard/git/gcc/gcc/cp/parser.c:21101
0xf6412a cp_parser_type_id_1
/home/vegard/git/gcc/gcc/cp/parser.c:20944
0xf79104 cp_parser_type_id
/home/vegard/git/gcc/gcc/cp/parser.c:21012
0xf79104 cp_parser_postfix_expression
/home/vegard/git/gcc/gcc/cp/parser.c:6724
0xf2e927 cp_parser_unary_expression
/home/vegard/git/gcc/gcc/cp/parser.c:8320
0xec435a cp_parser_cast_expression
/home/vegard/git/gcc/gcc/cp/parser.c:9088
0xec6986 cp_parser_binary_expression
/home/vegard/git/gcc/gcc/cp/parser.c:9189
0xeca75a cp_parser_assignment_expression
/home/vegard/git/gcc/gcc/cp/parser.c:9484
0xed0533 cp_parser_constant_expression
/home/vegard/git/gcc/gcc/cp/parser.c:9768
0xed77de cp_parser_initializer_clause
/home/vegard/git/gcc/gcc/cp/parser.c:21914
0xee0723 cp_parser_initializer
/home/vegard/git/gcc/gcc/cp/parser.c:21854
0xee0961 cp_parser_late_parse_one_default_arg
/home/vegard/git/gcc/gcc/cp/parser.c:27759
0xf1a050 cp_parser_late_parsing_nsdmi
/home/vegard/git/gcc/gcc/cp/parser.c:27811
$ xgcc --version
xgcc (GCC) 8.0.1 20180303 (experimental)
Built from git 0d86c284d085d29782d862600a79aa1ff0ee0c47 (r258221).
Seems to have appeared between 4.7.4 and 4.8.1 (when using -std=c++11).
If you change the initializer for 'a' to this:
int a[]{};
you get a segfault instead:
xgcc -x c++ -S -
<stdin>:7:34: internal compiler error: Segmentation fault
0x3156909 crash_signal
/home/vegard/git/gcc/gcc/toplev.c:325
0x125ab8a add_stmt(tree_node*)
/home/vegard/git/gcc/gcc/cp/semantics.c:390
0xe67cab do_pushtag
/home/vegard/git/gcc/gcc/cp/name-lookup.c:6475
0xe67cab pushtag(tree_node*, tree_node*, tag_scope)
/home/vegard/git/gcc/gcc/cp/name-lookup.c:6514
0xb63cd5 xref_tag_1
/home/vegard/git/gcc/gcc/cp/decl.c:13724
[...]
Test case was minimised by C-Reduce.
>From gcc-bugs-return-596088-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:30:51 2018
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Subject: [Bug c++/84691] [6/7/8 Regression] internal compiler error: in poplevel_class, at cp/name-lookup.c:4430
Date: Mon, 05 Mar 2018 08:30:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |error-recovery
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r179156. Much earlier than bug 84651.
>From gcc-bugs-return-596089-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:33:29 2018
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Subject: [Bug fortran/84675] Random FAIL: gfortran.dg/coarray_47.f90 -O (test for errors, line 12)
Date: Mon, 05 Mar 2018 08:33:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |FIXED
--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Browsing https://gcc.gnu.org/ml/gcc-regression/2018-03/, this seems fixed.
>From gcc-bugs-return-596090-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:35:31 2018
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Subject: [Bug tree-optimization/84670] [8 Regression] ICE: in compute_antic_aux, at tree-ssa-pre.c:2148 with -O2 -fno-tree-dominator-opts
Date: Mon, 05 Mar 2018 08:35:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |needs-reduction
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Gerald Pfeifer from comment #6)
> Created attachment 43559 [details]
> A testcase from Wine (fairly bigger)
>
> This is a testcase from a full Wine build. The others probably are
> better to nail this down, but for verification just in case a first
> fix addresses those but might not cover this one as well.
A fix for the original testcase in this bug also fixes this one (I can
reproduce the ICE with -O2 -m32 on x86_64-linux).
The other two testcases are unrelated - further reduction would be nice
with inclusion of the following to avoid reducing to a testcase for the
issue I have a patch for. Note that in the end I'm going to remove
the assert again - none of the testcases exhibit the infinite antic-in
computation issues.
Index: gcc/tree-ssa-pre.c
===================================================================
--- gcc/tree-ssa-pre.c (revision 258124)
+++ gcc/tree-ssa-pre.c (working copy)
@@ -1393,8 +1393,12 @@ phi_translate_1 (pre_expr expr, bitmap_s
else
{
unsigned value_id = get_expr_value_id (constant);
- constant = find_leader_in_sets (value_id, set1, set2,
- AVAIL_OUT (pred));
+ /* We want a leader in ANTIC_OUT to be consistent
+ with the rest of phi_translate but we don't have
+ that available (and it isn't complete yet) so
+ we resort to AVAIL_OUT here. */
+ constant = bitmap_find_leader (AVAIL_OUT (pred),
+ value_id);
if (constant)
return constant;
}
The original use of set1/set2 is clearly bogus here, as the comment now
states we'd like to use ANTIC_OUT (pred) here but we are computing that
right now. AVAIL_OUT is at least correct even if not 100% in spirit of
this function. The other testcases show that phi_translate is effectively
removing things from the set which is what causes the issue.
>From gcc-bugs-return-596091-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:36:06 2018
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Subject: [Bug ada/84706] New: Ada bootstrap fails on s390x since r258124
Date: Mon, 05 Mar 2018 08:36:00 -0000
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Bug ID: 84706
Summary: Ada bootstrap fails on s390x since r258124
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raised TYPES.UNRECOVERABLE_ERROR : comperr.adb:407
gnatmake: "/home/andreas/gcc/gcc/ada/xref_lib.adb" compilation error
make[3]: *** [../gcc-interface/Makefile:2212: common-tools] Error 4
make[3]: Leaving directory
'/home/andreas/build/gcc-64-master-z13-build/gcc/ada/tools'
make[2]: *** [Makefile:191: gnattools-native] Error 2
make[2]: Leaving directory
'/home/andreas/build/gcc-64-master-z13-build/gnattools'
make[1]: *** [Makefile:13026: all-gnattools] Error 2
make[1]: *** Waiting for unfinished jobs....
>From gcc-bugs-return-596092-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:39:52 2018
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Subject: [Bug target/82005] Early lto debug not implemented on Darwin
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P1 |P3
Summary|[8 regression] early lto |Early lto debug not
|debug creates invalid |implemented on Darwin
|assembly on Darwin |
--- Comment #37 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Dominique - please update with the current status after you manage
> to do another regular bootstrap/test cycle. Extra issues that crop
> up with running the testsuite with -flto -g are of course also welcome.
Results posted at https://gcc.gnu.org/ml/gcc-testresults/2018-03/msg00264.html.
I have changed the summary and reset the priority to P3.
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Subject: [Bug tree-optimization/84696] [8 Regression] ICE in compute_antic_aux, at tree-ssa-pre.c:2148
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84696
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |needs-reduction
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Martins testcase is fixed by the first fix for PR84670, the original testcase
of this PR is not. Would be nice to reduce it further so it can be included in
the testsuite. (with the fix pasted into PR84670 applied)
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Subject: [Bug c++/84705] [6/7/8 Regression] internal compiler error: in add_stmt, at cp/semantics.c:390
Date: Mon, 05 Mar 2018 08:41:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |error-recovery
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-05
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |6.5
Summary|internal compiler error: in |[6/7/8 Regression] internal
|add_stmt, at |compiler error: in
|cp/semantics.c:390 |add_stmt, at
| |cp/semantics.c:390
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
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Subject: [Bug tree-optimization/84696] [8 Regression] ICE in compute_antic_aux, at tree-ssa-pre.c:2148
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84696
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #3)
> Martins testcase is fixed by the first fix for PR84670, the original
> testcase of this PR is not. Would be nice to reduce it further so it can be
> included in the testsuite. (with the fix pasted into PR84670 applied)
Let me bisect that.
>From gcc-bugs-return-596096-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:47:43 2018
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Subject: [Bug tree-optimization/84696] [8 Regression] ICE in compute_antic_aux, at tree-ssa-pre.c:2148
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--- Comment #5 from rguenther at suse dot de <rguenther at suse dot de> ---
On Mon, 5 Mar 2018, marxin at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84696
>
> --- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
> (In reply to Richard Biener from comment #3)
> > Martins testcase is fixed by the first fix for PR84670, the original
> > testcase of this PR is not. Would be nice to reduce it further so it can be
> > included in the testsuite. (with the fix pasted into PR84670 applied)
>
> Let me bisect that.
Reduce please, not bisect ;)
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Subject: [Bug c++/84707] New: internal compiler error: Segmentation fault (tree_check()/duplicate_decls())
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Bug ID: 84707
Summary: internal compiler error: Segmentation fault
(tree_check()/duplicate_decls())
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Keywords: ice-on-invalid-code
Severity: normal
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Target Milestone: ---
Input (this one is positively cute):
inline namespace {
namespace {}
}
namespace {}
Output:
$ xgcc -x c++ -S -
<stdin>:5:1: internal compiler error: Segmentation fault
0x3156909 crash_signal
/home/vegard/git/gcc/gcc/toplev.c:325
0xb8cefc tree_check(tree_node*, char const*, int, char const*, tree_code)
/home/vegard/git/gcc/gcc/tree.h:3131
0xb8cefc duplicate_decls(tree_node*, tree_node*, bool)
/home/vegard/git/gcc/gcc/cp/decl.c:1413
0xe5f3e9 do_pushdecl
/home/vegard/git/gcc/gcc/cp/name-lookup.c:3019
0xe6b16a pushdecl(tree_node*, bool)
/home/vegard/git/gcc/gcc/cp/name-lookup.c:3154
0xe6b16a push_namespace(tree_node*, bool)
/home/vegard/git/gcc/gcc/cp/name-lookup.c:6953
0xffd25f cp_parser_namespace_definition
/home/vegard/git/gcc/gcc/cp/parser.c:18579
0x100203f cp_parser_declaration
/home/vegard/git/gcc/gcc/cp/parser.c:12762
0xff9d9b cp_parser_declaration_seq_opt
/home/vegard/git/gcc/gcc/cp/parser.c:12654
0xffb3c3 cp_parser_translation_unit
/home/vegard/git/gcc/gcc/cp/parser.c:4561
0xffb3c3 c_parse_file()
/home/vegard/git/gcc/gcc/cp/parser.c:38993
0x15a7105 c_common_parse_file()
/home/vegard/git/gcc/gcc/c-family/c-opts.c:1132
$ xgcc --version
xgcc (GCC) 8.0.1 20180303 (experimental)
Built from git 0d86c284d085d29782d862600a79aa1ff0ee0c47 (r258221).
Looks fine with 7.3.0.
Test case was minimised by C-Reduce.
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Subject: [Bug tree-optimization/84696] [8 Regression] ICE in compute_antic_aux, at tree-ssa-pre.c:2148
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--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to rguenther@suse.de from comment #5)
> On Mon, 5 Mar 2018, marxin at gcc dot gnu.org wrote:
>
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84696
> >
> > --- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
> > (In reply to Richard Biener from comment #3)
> > > Martins testcase is fixed by the first fix for PR84670, the original
> > > testcase of this PR is not. Would be nice to reduce it further so it can be
> > > included in the testsuite. (with the fix pasted into PR84670 applied)
> >
> > Let me bisect that.
>
> Reduce please, not bisect ;)
Yeah, I said bisect, but I meant reduce :)
$ cat reduce.i
char *a;
int b(void) {
long d;
if (a) {
char c;
while ((c = *a) && !((unsigned)c - '0' <= 9) && c != ',' && c != '-' &&
c != '+')
++a;
d = (long)a;
}
if (*a)
return d;
}
>From gcc-bugs-return-596100-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:51:41 2018
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Subject: [Bug c++/84705] [6/7/8 Regression] internal compiler error: in add_stmt, at cp/semantics.c:390
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r188473 or r188474.
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From: "krebbel at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84486] [7/8 Regression] code hoisting removes alignment assumption
Date: Mon, 05 Mar 2018 08:51:00 -0000
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--- Comment #3 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #2)
> Created attachment 43540 [details]
> candidate patch
>
> Can you check whether this patch works for you (on the unreduced testcase
> which likely exists)?
Yes, it does fix the bigger testcase as well. Thanks!
Do you plan to backport this also for GCC 7 branch?
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Subject: [Bug c++/84707] [8 Regression] internal compiler error: Segmentation fault (tree_check()/duplicate_decls())
Date: Mon, 05 Mar 2018 08:54:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-05
Ever confirmed|0 |1
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
We should warn, like clang++:
84707.C:5:1: warning: inline namespace reopened as a non-inline namespace
namespace {}
^
inline
84707.C:1:18: note: previous definition is here
inline namespace {
^
1 warning generated.
>From gcc-bugs-return-596101-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:54:16 2018
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Subject: [Bug c++/84707] [8 Regression] internal compiler error: Segmentation fault (tree_check()/duplicate_decls())
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |8.0
Summary|internal compiler error: |[8 Regression] internal
|Segmentation fault |compiler error:
|(tree_check()/duplicate_dec |Segmentation fault
|ls()) |(tree_check()/duplicate_dec
| |ls())
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-596103-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:56:16 2018
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Subject: [Bug tree-optimization/84706] [8 Regression] Ada bootstrap fails on s390x since r258124
Date: Mon, 05 Mar 2018 08:56:00 -0000
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ebotcazou at gcc dot gnu.org
Component|ada |tree-optimization
Target Milestone|--- |8.0
--- Comment #1 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Nothing to do with Ada apparently.
>From gcc-bugs-return-596104-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 08:57:14 2018
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Subject: [Bug c++/84707] [8 Regression] internal compiler error: Segmentation fault (tree_check()/duplicate_decls())
Date: Mon, 05 Mar 2018 08:57:00 -0000
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r253489. Before that:
error: ‘namespace _GLOBAL__N_1 { }’ conflicts with a previous declaration
namespace {}
>From gcc-bugs-return-596105-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 09:12:56 2018
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Subject: [Bug c++/84704] [8 Regression] internal compiler error: gimplification failed
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC| |jakub at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I'll have a look.
>From gcc-bugs-return-596106-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 09:42:23 2018
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Subject: [Bug c++/84704] [8 Regression] internal compiler error: gimplification failed
Date: Mon, 05 Mar 2018 09:42:00 -0000
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Ugh, this one is really nasty.
If a statement-expression has side-effects, like for:
a[({ i++; 0; })] %= 5;
the FE wraps the statement expression with a SAVE_EXPR:
# DEBUG BEGIN STMT;
<<cleanup_point <<< Unknown tree: expr_stmt
(void) (a[SAVE_EXPR <# DEBUG BEGIN STMT;
<<cleanup_point <<< Unknown tree: expr_stmt
(void) i++ >>>>>;
# DEBUG BEGIN STMT;
0>] = a[SAVE_EXPR <# DEBUG BEGIN STMT;
<<cleanup_point <<< Unknown tree: expr_stmt
(void) i++ >>>>>;
# DEBUG BEGIN STMT;
0>] % 5) >>>>>;
But as it doesn't have side-effects in this case, it isn't duplicated, and
unshare_expr/unshare_body uses mostly_copy_tree_r, which actually doesn't copy
STATEMENT_LISTs; and the gimplifier is destructive, so when the STATEMENT_LISTs
are shared by both ARRAY_REFs (which were unshared by unshare_body), the first
ARRAY_REF's index is gimplified fine, but turns the STATEMENT_LIST into void
typed one that only holds the DEBUG_BEGIN_STMT, and moves the constant out into
a temporary's initializer (which also looks problematic for -fcompare-debug)
and when we gimplify the second ARRAY_REF, we ICE, because ARRAY_REF index
really shouldn't have void type.
>From gcc-bugs-return-596107-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 09:51:37 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/84658] [7/8 Regression] -O3 -fmerge-all-constants causes incorrect for-each loop generation.
Date: Mon, 05 Mar 2018 09:51:00 -0000
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--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #11)
> (In reply to Jakub Jelinek from comment #10)
> > If ICF needs to adjust all points-to if it makes any variable aliases,
> > perhaps it should as well adjust the code to use the variables rather than
> > their aliases.
>
> Similar to what we do in sanopt.c:rewrite_usage_of_param? If so, I can do
> that.
But that doesn't help - you'll have points-to sets mentioning both DECLs.
static decls without TREE_ADDRESSABLE set are fine to merge, those won't
ever appear in points-to sets. For all others you really need to adjust
points-to sets.
Note the issue is "new" since we optimize address comparisons since the
idea was that for memory references aliasing doesn't really matter since
all decls we merge are readonly(?). That's of course a bit of a fishy
view...
Given ptrs_compare_unequal is as restricted as it is now we could work
around this issue there by doing instead of
if (VAR_P (obj1)
&& (TREE_STATIC (obj1) || DECL_EXTERNAL (obj1)))
{
varpool_node *node = varpool_node::get (obj1);
/* If obj1 may bind to NULL give up (see below). */
if (! node
|| ! node->nonzero_address ()
|| ! decl_binds_to_current_def_p (obj1))
return false;
}
sth like
if (VAR_P (obj1)
&& (TREE_STATIC (obj1) || DECL_EXTERNAL (obj1)))
{
varpool_node *node = varpool_node::get (obj1);
/* If obj1 may bind to NULL give up (see below). */
if (! node
|| ! node->nonzero_address ()
|| ! decl_binds_to_current_def_p (obj1))
return false;
FOR_EACH_ALIAS (node, ...)
{
tree obj1_alias = ...;
unsigned saved_pt_uid = DECL_PT_UID (obj1_alias);
DECL_PT_UID (obj1_alias) = DECL_UID (obj1_alias);
bool aliases = pt_solution_includes (&pi->pt, obj1_alias);
DECL_PT_UID (obj_alias) = saved_pt_uid;
}
}
with the code walking over aliases adjusted accordingly.
Of course if we ever try to compare two pointers and thus have just
two points-to sets to intersect we're still lost.
>From gcc-bugs-return-596108-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 09:54:16 2018
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From: "vegard.nossum at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84651] internal compiler error: in pop_local_binding, at cp/name-lookup.c:2054
Date: Mon, 05 Mar 2018 09:54:00 -0000
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--- Comment #2 from Vegard Nossum <vegard.nossum at gmail dot com> ---
Related test case/crash:
void a() {
struct {
void b(float) struct b = 0;
void b();
} x;
}
int b;
Gives:
xgcc -x c++ -S -
<stdin>: In function 'void a()':
<stdin>:3:17: error: expected ';' at end of member declaration
<stdin>:3:28: error: expected unqualified-id before '=' token
<stdin>: At global scope:
<stdin>:8:5: internal compiler error: Segmentation fault
0x3156909 crash_signal
/home/vegard/git/gcc/gcc/toplev.c:325
0xe219f2 outer_binding(tree_node*, cxx_binding*, bool)
/home/vegard/git/gcc/gcc/cp/name-lookup.c:5879
0xe5cbc9 lookup_name_real_1
/home/vegard/git/gcc/gcc/cp/name-lookup.c:6002
0xe5cbc9 lookup_name_real(tree_node*, int, int, bool, int, int)
/home/vegard/git/gcc/gcc/cp/name-lookup.c:6103
0xc45fb7 find_last_decl
/home/vegard/git/gcc/gcc/cp/decl2.c:1463
0xc45fb7 cplus_decl_attributes(tree_node**, tree_node*, int)
/home/vegard/git/gcc/gcc/cp/decl2.c:1545
0xc1a30a start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
/home/vegard/git/gcc/gcc/cp/decl.c:5044
0xfa3b9c cp_parser_init_declarator
/home/vegard/git/gcc/gcc/cp/parser.c:19598
0xfa99d7 cp_parser_simple_declaration
/home/vegard/git/gcc/gcc/cp/parser.c:13063
0xfafbc8 cp_parser_block_declaration
/home/vegard/git/gcc/gcc/cp/parser.c:12881
0x1002545 cp_parser_declaration
/home/vegard/git/gcc/gcc/cp/parser.c:12778
0xff9d9b cp_parser_declaration_seq_opt
/home/vegard/git/gcc/gcc/cp/parser.c:12654
0xffb3c3 cp_parser_translation_unit
/home/vegard/git/gcc/gcc/cp/parser.c:4561
0xffb3c3 c_parse_file()
/home/vegard/git/gcc/gcc/cp/parser.c:38993
0x15a7105 c_common_parse_file()
/home/vegard/git/gcc/gcc/c-family/c-opts.c:1132
>From gcc-bugs-return-596109-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 09:58:15 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/84658] [7/8 Regression] -O3 -fmerge-all-constants causes incorrect for-each loop generation.
Date: Mon, 05 Mar 2018 09:58:00 -0000
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--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
So you can loses the TREE_ADDRESSABLE restriction somewhat in requiring at most
one decl to be TREE_ADDRESSABLE - that's the one you need to keep, the others
may become aliases. Given TREE_ADDRESSABLE isn't reliable for !TREE_STATIC
vars
we can't merge any exported decls that way. Consider
const int foo1;
const int foo2;
int *bar(); // in other TU, returns address of foo1
int main ()
{
if (bar() != &foo2)
...;
}
not sure if we want to do hand-waving saying that we can't possibly have
points-to sets mentioning those without seeing the function IL. Well,
might be similarly hand-waving as the reference aliasing issue.
So we could drop the TREE_STATIC restriction if TREE_ADDRESSABLE is reliable
within the current TU.
>From gcc-bugs-return-596110-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 10:01:56 2018
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84704] [8 Regression] internal compiler error: gimplification failed
Date: Mon, 05 Mar 2018 10:01:00 -0000
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Testcase without division by zero:
int a[1] = { 0 };
void
foo ()
{
a[({ 0; })] %= 5;
}
--- gcc/tree.c.jj 2018-02-22 12:37:02.634387690 +0100
+++ gcc/tree.c 2018-03-05 10:50:54.355557537 +0100
@@ -4352,6 +4352,11 @@ stabilize_reference_1 (tree e)
switch (TREE_CODE_CLASS (code))
{
case tcc_exceptional:
+ /* Always wrap STATEMENT_LIST into SAVE_EXPR, even if it doesn't
+ have side-effects. */
+ if (code == STATEMENT_LIST)
+ return save_expr (e);
+ /* FALLTHRU */
case tcc_type:
case tcc_declaration:
case tcc_comparison:
fixes the ICE, but not really sure about it. And wonder if
gimplify_statement_list or voidify_wrapper_expr shouldn't special-case
non-TREE_SIDE_EFFECTS STATEMENT_LISTs which contain just DEBUG_BEGIN_STMTs and
one other stmt to gimplify it more like how it woiuld be gimplified without -g.
E.g. I fear the retval.* will mismatch otherwise.
>From gcc-bugs-return-596111-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 10:03:53 2018
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Subject: [Bug target/70359] [6/7/8 Regression] Code size increase for ARM compared to gcc-5.3.0
Date: Mon, 05 Mar 2018 10:03:00 -0000
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--- Comment #29 from rguenther at suse dot de <rguenther at suse dot de> ---
On Fri, 2 Mar 2018, aldyh at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70359
>
> --- Comment #28 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
> (In reply to Richard Biener from comment #25)
>
>
> > What usually makes things complicated in the end is when for an IV
> > we get overlapping life-ranges for the before and after value because
> > that inhibits coalescing. Is this what happens here?
> ...
> ...
> > So we indeed have p_20 and p_9 live as p_9 is used after the loop.
> > Originally
> > this wasn't the case but fold_stmt in the first forwprop pass does this
> > by means of following use-def chains.
>
> I'm a bit confused.
>
> Where are you looking, after the forprop1 pass? Because after forwprop1 I see:
>
> <bb 5> :
> p_22 = p_8 + 4294967294;
> MEM[(char *)p_19 + 4294967295B] = 45;
>
> <bb 6> :
> # p_9 = PHI <p_19(4), p_22(5)>
> return p_9;
>
> Which as I understand has:
>
> p_8 being the IV at the beginning of the last iteration.
> p_19 being the IV at the end of the last iteration.
> p_22 being the IV at the end of the last iteration MINUS 1.
>
> I don't see a p_20 anywhere. Did you mean that p_8 and p_19 where both live at
> the end of the loop?
Yes. Not sure if that captures all of the issues in this bug but that's
clearly bad.
>From gcc-bugs-return-596114-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 10:16:46 2018
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Subject: [Bug tree-optimization/84650] [8 Regression] [graphite] ICE: Segmentation fault (in create_new_iv)
Date: Mon, 05 Mar 2018 10:16:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug tree-optimization/84650] [8 Regression] [graphite] ICE: Segmentation fault (in create_new_iv)
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-596112-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 10:16:41 2018
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Subject: [Bug tree-optimization/84650] [8 Regression] [graphite] ICE: Segmentation fault (in create_new_iv)
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--- Comment #4 from rguenther at suse dot de <rguenther at suse dot de> ---
On Sat, 3 Mar 2018, amker at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84650
>
> --- Comment #3 from amker at gcc dot gnu.org ---
> So given below dump before sccp:
>
> <bb 2> [local count: 14598063]:
>
> <bb 3> [local count: 118111601]:
> # eu_19 = PHI <0(2), eu_13(7)>
>
> <bb 4> [local count: 955630224]:
> # dj.1_18 = PHI <0(3), _1(8)>
> _1 = dj.1_18 + 1;
> if (_1 <= 1)
> goto <bb 8>; [89.00%]
> else
> goto <bb 5>; [11.00%]
>
> <bb 8> [local count: 850510900]:
> goto <bb 4>; [100.00%]
>
> <bb 5> [local count: 118111601]:
> # _2 = PHI <_1(4)>
> _4 = _2 != 3;
> _5 = (unsigned int) _4;
> _15 = 1 - _5;
> eu_13 = _15 + eu_19;
> if (eu_13 <= 1)
> goto <bb 7>; [87.64%]
> else
> goto <bb 6>; [12.36%]
>
> <bb 7> [local count: 103513538]:
> goto <bb 3>; [100.00%]
>
> <bb 6> [local count: 14598063]:
> # _25 = PHI <_2(5)>
> dj = _25;
> return;
>
> before sccp, e_13, _15 and e_19 was identified as:
> e_13: {_15, _15}
> _15 : _15
> e_19: {0, _15}
>
> During sccp, it proves _15 equals to 0 and thus:
> e_13: 0
> _15 : 0
> e_19: {0, _15}
>
> This information is cached and used in ivopts.
I see scev_reset () being called multiple times between
sccp and ivopts so I doubt that. The SCEV cache isn't
reset between GRAPHITE and IVOPTs though and LIM after
GRAPHITE moves some expressions.
Testing a fix.
>From gcc-bugs-return-596115-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 10:20:10 2018
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--- Comment #2 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Mon Mar 5 10:19:11 2018
New Revision: 258241
URL: https://gcc.gnu.org/viewcvs?rev=258241&root=gcc&view=rev
Log:
2018-03-05 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/82022
* g++.dg/cpp1z/constexpr-lambda20.C: New.
Added:
trunk/gcc/testsuite/g++.dg/cpp1z/constexpr-lambda20.C
Modified:
trunk/gcc/testsuite/ChangeLog
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/54367] [meta-bug] lambda expressions
Date: Mon, 05 Mar 2018 10:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54367
Bug 54367 depends on bug 82022, which changed state.
Bug 82022 Summary: constexpr lambda in template context: expression ‘<lambda>’ is not a constant expression
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82022
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: =?UTF-8?B?W0J1ZyBjKysvODIwMjJdIGNvbnN0ZXhwciBsYW1iZGEgaW4gdGVtcGxhdGUg?= =?UTF-8?B?Y29udGV4dDogZXhwcmVzc2lvbiDigJg8bGFtYmRhPuKAmSBpcyBub3QgYSBj?= =?UTF-8?B?b25zdGFudCBleHByZXNzaW9u?Date: Mon, 05 Mar 2018 10:22:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |8.0
--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed in trunk. Of course this requires -std=c++17
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From: "vegard.nossum at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84708] New: internal compiler error: in lambda_expr_this_capture, at cp/lambda.c:772
Date: Mon, 05 Mar 2018 10:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84708
Bug ID: 84708
Summary: internal compiler error: in lambda_expr_this_capture,
at cp/lambda.c:772
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vegard.nossum at gmail dot com
CC: webrown.cpp at gmail dot com
Target Milestone: ---
Input:
int y;
void a() {
struct {
int b = ([] {
decltype(b) x = y;
return y;
}) ();
} z;
}
Output:
$ xgcc -x c++ -S -
<stdin>: In lambda function:
<stdin>:6:16: internal compiler error: in lambda_expr_this_capture, at
cp/lambda.c:772
0xd491ff lambda_expr_this_capture(tree_node*, bool)
/home/vegard/git/gcc/gcc/cp/lambda.c:770
0xd4980c maybe_resolve_dummy(tree_node*, bool)
/home/vegard/git/gcc/gcc/cp/lambda.c:879
0x12acfc9 finish_non_static_data_member(tree_node*, tree_node*, tree_node*)
/home/vegard/git/gcc/gcc/cp/semantics.c:1788
0x12b23d2 finish_id_expression(tree_node*, tree_node*, tree_node*, cp_id_kind*,
bool, bool, bool*, bool, bool, bool, bool, char const**, unsigned int)
/home/vegard/git/gcc/gcc/cp/semantics.c:3719
0xf7f285 cp_parser_decltype_expr
/home/vegard/git/gcc/gcc/cp/parser.c:13999
0xf7f285 cp_parser_decltype
/home/vegard/git/gcc/gcc/cp/parser.c:14133
0xf31fa7 cp_parser_simple_type_specifier
/home/vegard/git/gcc/gcc/cp/parser.c:17063
0xf26f2d cp_parser_type_specifier
/home/vegard/git/gcc/gcc/cp/parser.c:16850
0xf8c7ba cp_parser_decl_specifier_seq
/home/vegard/git/gcc/gcc/cp/parser.c:13627
0xfa7ca0 cp_parser_simple_declaration
/home/vegard/git/gcc/gcc/cp/parser.c:12936
0xfafbc8 cp_parser_block_declaration
/home/vegard/git/gcc/gcc/cp/parser.c:12881
0xfb2094 cp_parser_declaration_statement
/home/vegard/git/gcc/gcc/cp/parser.c:12474
0xefef9b cp_parser_statement
/home/vegard/git/gcc/gcc/cp/parser.c:10923
0xf02a5b cp_parser_statement_seq_opt
/home/vegard/git/gcc/gcc/cp/parser.c:11272
0xfd3951 cp_parser_lambda_body
/home/vegard/git/gcc/gcc/cp/parser.c:10683
0xfd3951 cp_parser_lambda_expression
/home/vegard/git/gcc/gcc/cp/parser.c:10184
0xf390e4 cp_parser_primary_expression
/home/vegard/git/gcc/gcc/cp/parser.c:5259
0xf7abbb cp_parser_postfix_expression
/home/vegard/git/gcc/gcc/cp/parser.c:7028
0xf2e927 cp_parser_unary_expression
/home/vegard/git/gcc/gcc/cp/parser.c:8320
0xec435a cp_parser_cast_expression
/home/vegard/git/gcc/gcc/cp/parser.c:9088
$ xgcc --version
xgcc (GCC) 8.0.1 20180303 (experimental)
Built from git 0d86c284d085d29782d862600a79aa1ff0ee0c47 (r258221).
I'm not sure if it's really valid code or not, but clang (with -std=c++11)
compiles the test case without any errors.
Test case was minimised by C-Reduce.
Looks related (identical?) to bug #79651 and bug #83268, but the test case
looks smaller in any case.
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84701] casting to ( unsigned typeof(variable) ) gives wrong results
Date: Mon, 05 Mar 2018 10:32:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |jason at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Using typeof(var) in casts of course works, but that is not what you are doing,
you are using that plus unsigned. This is rejected by other compilers or with
-pedantic-errors by G++:
error: long, short, signed or unsigned used invalidly for ‘type name’
Otherwise it is an extension which handles the typedef cases by:
if (explicit_intN)
type = int_n_trees[declspecs->int_n_idx].unsigned_type;
else if (longlong)
type = long_long_unsigned_type_node;
else if (long_p)
type = long_unsigned_type_node;
else if (short_p)
type = short_unsigned_type_node;
else if (type == char_type_node)
type = unsigned_char_type_node;
else if (typedef_decl)
type = unsigned_type_for (type);
else
type = unsigned_type_node;
(that is the typedef_decl case) but typeof doesn't fall into that category and
so it is just always set to unsigned. Not really convinced we should extend
this extension for typeof, perhaps better just to reject it even when not
pedantic if it is the unsigned/signed/long/short etc. typeof () case.
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From: "amker at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84650] [8 Regression] [graphite] ICE: Segmentation fault (in create_new_iv)
Date: Mon, 05 Mar 2018 10:38:00 -0000
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--- Comment #5 from amker at gcc dot gnu.org ---
(In reply to rguenther@suse.de from comment #4)
> On Sat, 3 Mar 2018, amker at gcc dot gnu.org wrote:
>
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84650
> >
> > --- Comment #3 from amker at gcc dot gnu.org ---
> > So given below dump before sccp:
> >
> > <bb 2> [local count: 14598063]:
> >
> > <bb 3> [local count: 118111601]:
> > # eu_19 = PHI <0(2), eu_13(7)>
> >
> > <bb 4> [local count: 955630224]:
> > # dj.1_18 = PHI <0(3), _1(8)>
> > _1 = dj.1_18 + 1;
> > if (_1 <= 1)
> > goto <bb 8>; [89.00%]
> > else
> > goto <bb 5>; [11.00%]
> >
> > <bb 8> [local count: 850510900]:
> > goto <bb 4>; [100.00%]
> >
> > <bb 5> [local count: 118111601]:
> > # _2 = PHI <_1(4)>
> > _4 = _2 != 3;
> > _5 = (unsigned int) _4;
> > _15 = 1 - _5;
> > eu_13 = _15 + eu_19;
> > if (eu_13 <= 1)
> > goto <bb 7>; [87.64%]
> > else
> > goto <bb 6>; [12.36%]
> >
> > <bb 7> [local count: 103513538]:
> > goto <bb 3>; [100.00%]
> >
> > <bb 6> [local count: 14598063]:
> > # _25 = PHI <_2(5)>
> > dj = _25;
> > return;
> >
> > before sccp, e_13, _15 and e_19 was identified as:
> > e_13: {_15, _15}
> > _15 : _15
> > e_19: {0, _15}
> >
> > During sccp, it proves _15 equals to 0 and thus:
> > e_13: 0
> > _15 : 0
> > e_19: {0, _15}
> >
> > This information is cached and used in ivopts.
>
> I see scev_reset () being called multiple times between
> sccp and ivopts so I doubt that. The SCEV cache isn't
> reset between GRAPHITE and IVOPTs though and LIM after
> GRAPHITE moves some expressions.
Hmm, in this case the problem is in scev, which doesn't fold {0, _15} given _15
is known to be zero?
>
> Testing a fix.
Thanks for helping.
>From gcc-bugs-return-596121-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 10:40:26 2018
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From: "simon at pushface dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/82005] Early lto debug not implemented on Darwin
Date: Mon, 05 Mar 2018 10:40:00 -0000
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--- Comment #38 from simon at pushface dot org ---
(In reply to Dominique d'Humieres from comment #37)
> > Dominique - please update with the current status after you manage
> > to do another regular bootstrap/test cycle. Extra issues that crop
> > up with running the testsuite with -flto -g are of course also welcome.
>
> Results posted at
> https://gcc.gnu.org/ml/gcc-testresults/2018-03/msg00264.html.
>
> I have changed the summary and reset the priority to P3.
The ACATS failure (c250002) is to be expected on darwin17 (at least with APFS,
the file system for internal SSDs) because it attempts to create a file with an
illegal name (contains non-utf8 character).
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/67608] ICE when capturing a local 2D array
Date: Mon, 05 Mar 2018 10:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67608
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Dup.
*** This bug has been marked as a duplicate of bug 60230 ***
>From gcc-bugs-return-596123-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 10:44:55 2018
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/60230] internal compiler error on lambdas capturing multidimensional arrays with dynamic boundary
Date: Mon, 05 Mar 2018 10:44:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |linesprower at gmail dot com
--- Comment #7 from Paolo Carlini <paolo.carlini at oracle dot com> ---
*** Bug 67608 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-596124-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 10:50:00 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/84681] tree-ter moving code too much
Date: Mon, 05 Mar 2018 10:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84681
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-05
CC| |rguenth at gcc dot gnu.org
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
TER doesn't hoist things - it moves dependent computations down to sinks, this
is historically "simulating" RTL expansion from GENERIC where we had much
larger expression trees and was added to avoid regressions.
I've experimented in the past with disabling TER and we indeed do see
regressions
there.
Note that the appearant "schedule" on GIMPLE is mostly meaningless if you look
at a single BB given passes do not spend any time thinking about stmt placement
apart from having all dependences available. Thus I suggested to have a
BB-local
"scheduling" pass on GIMPLE that for example minimizes register pressure.
Of course TER will wreck any such thing.
See https://gcc.gnu.org/ml/gcc-patches/2016-06/msg02062.html for an attempt
to keep the scheduling part of TER but remove its effect otherwise (the
scheduling
part is just a side-effect that's somewhat hard to avoid I think). It shows
that we'll need to go a quite big step further and do sth like early
instruction
selection on GIMPLE while expanding to RTL...
>From gcc-bugs-return-596125-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 10:52:03 2018
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84650] [8 Regression] [graphite] ICE: Segmentation fault (in create_new_iv)
Date: Mon, 05 Mar 2018 10:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84650
--- Comment #6 from rguenther at suse dot de <rguenther at suse dot de> ---
On Mon, 5 Mar 2018, amker at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84650
>
> --- Comment #5 from amker at gcc dot gnu.org ---
> (In reply to rguenther@suse.de from comment #4)
> > On Sat, 3 Mar 2018, amker at gcc dot gnu.org wrote:
> >
> > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84650
> > >
> > > --- Comment #3 from amker at gcc dot gnu.org ---
> > > So given below dump before sccp:
> > >
> > > <bb 2> [local count: 14598063]:
> > >
> > > <bb 3> [local count: 118111601]:
> > > # eu_19 = PHI <0(2), eu_13(7)>
> > >
> > > <bb 4> [local count: 955630224]:
> > > # dj.1_18 = PHI <0(3), _1(8)>
> > > _1 = dj.1_18 + 1;
> > > if (_1 <= 1)
> > > goto <bb 8>; [89.00%]
> > > else
> > > goto <bb 5>; [11.00%]
> > >
> > > <bb 8> [local count: 850510900]:
> > > goto <bb 4>; [100.00%]
> > >
> > > <bb 5> [local count: 118111601]:
> > > # _2 = PHI <_1(4)>
> > > _4 = _2 != 3;
> > > _5 = (unsigned int) _4;
> > > _15 = 1 - _5;
> > > eu_13 = _15 + eu_19;
> > > if (eu_13 <= 1)
> > > goto <bb 7>; [87.64%]
> > > else
> > > goto <bb 6>; [12.36%]
> > >
> > > <bb 7> [local count: 103513538]:
> > > goto <bb 3>; [100.00%]
> > >
> > > <bb 6> [local count: 14598063]:
> > > # _25 = PHI <_2(5)>
> > > dj = _25;
> > > return;
> > >
> > > before sccp, e_13, _15 and e_19 was identified as:
> > > e_13: {_15, _15}
> > > _15 : _15
> > > e_19: {0, _15}
> > >
> > > During sccp, it proves _15 equals to 0 and thus:
> > > e_13: 0
> > > _15 : 0
> > > e_19: {0, _15}
> > >
> > > This information is cached and used in ivopts.
> >
> > I see scev_reset () being called multiple times between
> > sccp and ivopts so I doubt that. The SCEV cache isn't
> > reset between GRAPHITE and IVOPTs though and LIM after
> > GRAPHITE moves some expressions.
> Hmm, in this case the problem is in scev, which doesn't fold {0, _15} given _15
> is known to be zero?
SCEV doesn't really do any folding but yeah, I'm not sure why _15
isn't picked up as 0 here. That would be worth investigating.
Note that we don't really expect unfolded/unpropagated constants
so it doesn't surprise me we see this kind of effects.
>From gcc-bugs-return-596126-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 10:53:33 2018
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Subject: [Bug c++/84684] inserting random code / flags produces wrong code
Date: Mon, 05 Mar 2018 10:53:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #1)
> Confirmed, valgrind shows a lot of errors like this:
Use --enable-valgrind-annotations, the sparseset errors are spurious.
> ==13397== Conditional jump or move depends on uninitialised value(s)
> ==13397== at 0xD1F55E: sparseset_bit_p(sparseset_def*, unsigned long) (in
> /home/jwakely/gcc/7.3.0/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1plus)
> ==13397== by 0xD1FF9B: mark_pseudo_regno_live(int) (in
> /home/jwakely/gcc/7.3.0/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1plus)
> ==13397== by 0xD2025C: mark_pseudo_reg_live(rtx_def*, unsigned int) (in
> /home/jwakely/gcc/7.3.0/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1plus)
> ==13397== by 0xD202CA: mark_ref_live(df_ref_d*) (in
> /home/jwakely/gcc/7.3.0/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1plus)
> ==13397== by 0xD22B05: process_bb_node_lives(ira_loop_tree_node*) (in
> /home/jwakely/gcc/7.3.0/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1plus)
> ==13397== by 0xCFA50D: ira_traverse_loop_tree(bool, ira_loop_tree_node*,
> void (*)(ira_loop_tree_node*), void (*)(ira_loop_tree_node*)) (in
> /home/jwakely/gcc/7.3.0/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1plus)
> ==13397== by 0xD23991: ira_create_allocno_live_ranges() (in
> /home/jwakely/gcc/7.3.0/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1plus)
> ==13397== by 0xCFE468: ira_build() (in
> /home/jwakely/gcc/7.3.0/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1plus)
> ==13397== by 0xCF53A5: ira(_IO_FILE*) (in
> /home/jwakely/gcc/7.3.0/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1plus)
> ==13397== by 0xCF5B48: (anonymous
> namespace)::pass_ira::execute(function*) (in
> /home/jwakely/gcc/7.3.0/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1plus)
> ==13397== by 0xE132FF: execute_one_pass(opt_pass*) (in
> /home/jwakely/gcc/7.3.0/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1plus)
> ==13397== by 0xE13650: execute_pass_list_1(opt_pass*) (in
> /home/jwakely/gcc/7.3.0/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1plus)
> ==13397==
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Subject: [Bug c/84685] Designated initializers warning
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-05
Ever confirmed|0 |1
>From gcc-bugs-return-596128-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 10:55:43 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84686] [6/7 Regression] Parenthesized discarded value expression are not evaluated with option -std=c++14
Date: Mon, 05 Mar 2018 10:55:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Priority|P3 |P2
Known to work| |8.0
Summary|[6/7/8 Regression] |[6/7 Regression]
|Parenthesized discarded |Parenthesized discarded
|value expression are not |value expression are not
|evaluated with option |evaluated with option
|-std=c++14 |-std=c++14
>From gcc-bugs-return-596129-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 10:56:58 2018
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Subject: [Bug c++/84691] [6/7/8 Regression] internal compiler error: in poplevel_class, at cp/name-lookup.c:4430
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84691
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
>From gcc-bugs-return-596131-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 11:20:28 2018
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84687] [8 Regression] error: invalid conversion in gimple call with -O3 and -ffast-math
Date: Mon, 05 Mar 2018 11:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84687
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This seems to be a general match.pd issue.
We have:
vect_patt_27.7_52 = exp.simdclone.0 (vect_patt_6.6_50);
vect_patt_27.7_53 = exp.simdclone.0 (vect_patt_6.6_51);
vect__26.9_57 = exp.simdclone.0 (vect__25.8_55);
vect__26.9_58 = exp.simdclone.0 (vect__25.8_56);
vect__4.10_59 = vect__26.9_57 * vect_patt_27.7_52;
vect__4.10_60 = vect__26.9_58 * vect_patt_27.7_53;
and apply the:
/* Simplify expN(x) * expN(y) -> expN(x+y). */
(for exps (EXP EXP2 EXP10 POW10)
(simplify
(mult (exps:s @0) (exps:s @1))
(exps (plus @0 @1))))
rule to it and emit __builtin_exp !! rather than the exp.simdclone.0 calls, but
of course __builtin_exp can't handle vector arguments.
So, shall simd_clone_create just clear DECL_BUILT_IN_CLASS and
DECL_FUNCTION_CODE of the simd clones it creates (thus disabling all further
optimizations of it), or do we want to make match.pd generator smarter and
allow somehow propagating the actual fndecls used from the original and copy,
or both (do the former temporarily and later on undo it and improve match.pd)?
>From gcc-bugs-return-596130-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 11:20:19 2018
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From: "amker at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84650] [8 Regression] [graphite] ICE: Segmentation fault (in create_new_iv)
Date: Mon, 05 Mar 2018 11:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84650
--- Comment #7 from amker at gcc dot gnu.org ---
(In reply to rguenther@suse.de from comment #6)
> On Mon, 5 Mar 2018, amker at gcc dot gnu.org wrote:
>
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84650
> >
> > --- Comment #5 from amker at gcc dot gnu.org ---
> > (In reply to rguenther@suse.de from comment #4)
> > > On Sat, 3 Mar 2018, amker at gcc dot gnu.org wrote:
> > >
> > > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84650
> > > >
> > > > --- Comment #3 from amker at gcc dot gnu.org ---
> > > > So given below dump before sccp:
> > > >
> > > > <bb 2> [local count: 14598063]:
> > > >
> > > > <bb 3> [local count: 118111601]:
> > > > # eu_19 = PHI <0(2), eu_13(7)>
> > > >
> > > > <bb 4> [local count: 955630224]:
> > > > # dj.1_18 = PHI <0(3), _1(8)>
> > > > _1 = dj.1_18 + 1;
> > > > if (_1 <= 1)
> > > > goto <bb 8>; [89.00%]
> > > > else
> > > > goto <bb 5>; [11.00%]
> > > >
> > > > <bb 8> [local count: 850510900]:
> > > > goto <bb 4>; [100.00%]
> > > >
> > > > <bb 5> [local count: 118111601]:
> > > > # _2 = PHI <_1(4)>
> > > > _4 = _2 != 3;
> > > > _5 = (unsigned int) _4;
> > > > _15 = 1 - _5;
> > > > eu_13 = _15 + eu_19;
> > > > if (eu_13 <= 1)
> > > > goto <bb 7>; [87.64%]
> > > > else
> > > > goto <bb 6>; [12.36%]
> > > >
> > > > <bb 7> [local count: 103513538]:
> > > > goto <bb 3>; [100.00%]
> > > >
> > > > <bb 6> [local count: 14598063]:
> > > > # _25 = PHI <_2(5)>
> > > > dj = _25;
> > > > return;
> > > >
> > > > before sccp, e_13, _15 and e_19 was identified as:
> > > > e_13: {_15, _15}
> > > > _15 : _15
> > > > e_19: {0, _15}
> > > >
> > > > During sccp, it proves _15 equals to 0 and thus:
> > > > e_13: 0
> > > > _15 : 0
> > > > e_19: {0, _15}
> > > >
> > > > This information is cached and used in ivopts.
> > >
> > > I see scev_reset () being called multiple times between
> > > sccp and ivopts so I doubt that. The SCEV cache isn't
> > > reset between GRAPHITE and IVOPTs though and LIM after
> > > GRAPHITE moves some expressions.
> > Hmm, in this case the problem is in scev, which doesn't fold {0, _15} given _15
> > is known to be zero?
>
> SCEV doesn't really do any folding but yeah, I'm not sure why _15
> isn't picked up as 0 here. That would be worth investigating.
Ah, I kind of remember that in follow_ssa_edge_binary, it tries each operand of
add operation (a_13 = _15 + e_19;). Here the case might be it finds out
impossible to follow _15 to halting phi, the function then tries e_19 instead
and keep _15 in its own form, thus {0, _15}.
>
> Note that we don't really expect unfolded/unpropagated constants
> so it doesn't surprise me we see this kind of effects.
>From gcc-bugs-return-596132-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 11:22:35 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/84667] unreasonable refusal to use assignment operator method
Date: Mon, 05 Mar 2018 11:22:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Resolution|--- |INVALID
--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Elmar Stellnberger from comment #9)
> I still do not understand why this constructor gets called: inline xstrbuf(
> base_str s ). If I use .as_const() the result should be an xstr_const :
> public xstr_abstract<const xchar,xchar> and not an xstr_mutable: public
> xstr_abstract<xchar,xchar>. Even if it ascended to xstr_abstract it would
> have to discard the const qualifyer.
Read my answer again more carefully.
> This is copy-initialization:
>
> estrbuf copybuf1 = varbuf4.as_const();
>
> That means it's equivalent to this:
>
> estrbuf copybuf1 = estrbuf(varbuf4.as_const());
The result of as_const() is an xstr_const, but then a temporary xstrbuf is
created from that, and then because your copy constructor was not viable for
copying a temporary (it only accepts non-const lvalues) the temporary is
converted to its base class (xstr_mutable) and then the xstrbuf(base_str)
constructor is used.
If you write complicated, unreadblae code then don't be surprised if you can't
understand what it does!
(In reply to Elmar Stellnberger from comment #11)
> Why does my gcc not report uninitialized variables. Is the version too old
> (6.3.0 20170516)?
Yes, I see warnings with GCC 7.1 and later.
> Still I do not know how g++ can convert an xstr_const into an
> xstr_mutable. That should be impossible as stated in the comment above. Thus
> the fact that correcting an error reported by clang has made the program
> behave correctly under g++ is simply astonishing. However I have no idea why
> g++ behaves like this.
Because that's what the C++ standard says should happen.
I don't get any error compiling yuor code with clang, I see exactly the same
behaviour as GCC.
>From gcc-bugs-return-596133-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 11:27:33 2018
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Subject: [Bug c++/84695] Missed opportunity to issue warning about override
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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>From gcc-bugs-return-596134-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 11:29:03 2018
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Subject: [Bug c++/84689] is_invocable is true even for call operator via ambiguous base
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>From gcc-bugs-return-596135-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 11:30:49 2018
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Subject: [Bug c++/80245] Ambiguous operator() call on class with ambiguous base classes treated as hard error in SFINAE context
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>From gcc-bugs-return-596136-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 11:41:07 2018
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81976
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed by r257745
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Subject: [Bug fortran/84615] [8 Regression] Executable Segfault for tests compiled with -fdefault-integer-8 and -m32
Date: Mon, 05 Mar 2018 11:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84615
--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The following test (reduced from gfortran.dg/pr46588.f90)
function aufun(pm)
character(len = *) pm
character(len = *) aufun
print *, ">", pm, "<"
aufun = 'Oh' // trim(pm)
end function aufun
program ds
implicit none
character(len = 4) :: ins = ' no!'
character(len = 20) st, aufun
logical(4) :: tst
print *, ">", ins, "<"
st = aufun(ins)
print *, ">", st, "<"
end
gives
> no!<
Program received signal SIGSEGV: Segmentation fault - invalid memory reference.
at run time when compiled with -m32 -fdefault-integer-8.
I don't see any difference when comparing the outputs of -fdump-tree-original
with -m32 or -m32 -fdefault-integer-8, but I see the following difference in
the assembly files
--- pr46588_db.s 2018-03-05 12:50:58.000000000 +0100
+++ pr46588_db_m32.s 2018-03-05 12:50:41.000000000 +0100
@@ -3,8 +3,7 @@
# GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
# options passed: pr46588_db.f90 -fPIC -m32 -mmacosx-version-min=10.13.0
-# -mtune=corei7 -march=corei7 -fdefault-integer-8 -fdump-tree-original
-# -fverbose-asm
+# -mtune=corei7 -march=corei7 -fdump-tree-original -fverbose-asm
# -fintrinsic-modules-path
/opt/gcc/gcc8w/lib/gcc/x86_64-apple-darwin17.4.0/8.0.1/i386/finclude
# options enabled: -Wnonportable-cfstrings -fPIC
# -faggressive-loop-optimizations -fasynchronous-unwind-tables
@@ -255,16 +254,14 @@ L2$pb:
call __gfortran_st_write_done #
addl $16, %esp #,
# pr46588_db.f90:14: st = aufun(ins)
- subl $12, %esp #,
pushl $4 #
leal _ins.3702-L2$pb(%ebx), %eax #, tmp97
pushl %eax # tmp97
- pushl $0 #
pushl $20 #
leal -48(%ebp), %eax #, tmp98
pushl %eax # tmp98
call _aufun_ #
- addl $32, %esp #,
+ addl $16, %esp #,
movl -48(%ebp), %eax # MEM[(c_char * {ref-all})&str.5], tmp99
movl %eax, -28(%ebp) # tmp99, MEM[(c_char * {ref-all})&st]
movl -44(%ebp), %eax # MEM[(c_char * {ref-all})&str.5], tmp100
>From gcc-bugs-return-596138-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 11:59:02 2018
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From: "jose.dapena at lge dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/84709] New: Cannot define method with same name of previously using declared class
Date: Mon, 05 Mar 2018 11:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84709
Bug ID: 84709
Summary: Cannot define method with same name of previously
using declared class
Product: gcc
Version: 7.3.0
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This test case is failing with g++ 7.3.0:
namespace A {
class Foo {
...
};
}
using A::Foo
namespace B {
class Bar {
const Foo &Foo() const {
...
}
}
The declaration of B Foo accessor fails because it "changes meaning" of A::Foo.
But as far as I could check in C++14 standard, this should be covered by
basic.scope.hiding/2 right?
>From gcc-bugs-return-596139-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 11:59:03 2018
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Subject: [Bug fortran/39030] Support -fexcess-precision={standard,fast} also for Fortran
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |WONTFIX
--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> More than eight years later is there any point to keep this PR opened?
More than four months without feedback. Closing as WONTFIX
>From gcc-bugs-return-596141-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 12:02:53 2018
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Subject: [Bug libstdc++/84690] std::is_invocable not working for ambiguous calls
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Vincent Reverdy from comment #0)
> The std::is_invocable type trait from the standard library fails to detect
> that the first call in the main function is ambiguous. The program returns
> 1, 1, 1 instead of 0, 1, 1. This seems to be related to
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84689 and to
Isn't it identical?
The variadic templates in this version seem irrelevant to the bug.
#include <iostream>
#include <type_traits>
// A base class
struct base {void operator()(int){};};
// Two derived classes inheriting from the same base classes
struct derived1: base {
using base::operator();
};
struct derived2: base {
using base::operator();
void operator()(char);
void operator()(float);
};
// A class inheriting from both derived1 and derived2
struct functor: derived1, derived2 {
using derived1::operator();
using derived2::operator();
};
// Main function
int main()
{
std::cout << std::is_invocable_v<functor, int> << "\n";
std::cout << std::is_invocable_v<functor, float> << "\n";
std::cout << std::is_invocable_v<functor, char> << "\n";
}
*** This bug has been marked as a duplicate of bug 84689 ***
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Subject: [Bug c++/84689] is_invocable is true even for call operator via ambiguous base
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 84690 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-596142-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 12:03:20 2018
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Subject: [Bug libfortran/35844] Overwriting the -std= option at runtime via environment variable
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Almost nine years without reaction. How long would this PR have to rot before
being closed as WONTFIX?
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Subject: [Bug demangler/82195] Undemangleable lambda
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Nathan Sidwell <nathan at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #10 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
yes, no one's complained about the fix :)
>From gcc-bugs-return-596144-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 12:08:18 2018
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Subject: [Bug c++/54367] [meta-bug] lambda expressions
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54367
Bug 54367 depends on bug 82195, which changed state.
Bug 82195 Summary: Undemangleable lambda
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82195
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
>From gcc-bugs-return-596146-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 12:13:20 2018
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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84710] New: [8 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1896 with -O -fno-forward-propagate
Date: Mon, 05 Mar 2018 12:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84710
Bug ID: 84710
Summary: [8 Regression] ICE: RTL check: expected code 'reg',
have 'subreg' in rhs_regno, at rtl.h:1896 with -O
-fno-forward-propagate
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: ice-checking, ice-on-valid-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: aarch64-unknown-linux-gnu
Created attachment 43561
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43561&action=edit
reduced testcase
Compiler output:
$ aarch64-unknown-linux-gnu-gcc -O -fno-forward-propagate testcase.c
during RTL pass: combine
testcase.c: In function 'foo':
testcase.c:9:1: internal compiler error: RTL check: expected code 'reg', have
'subreg' in rhs_regno, at rtl.h:1896
}
^
0x5b8938 rtl_check_failed_code1(rtx_def const*, rtx_code, char const*, int,
char const*)
/repo/gcc-trunk/gcc/rtl.c:846
0x5e73c5 rhs_regno
/repo/gcc-trunk/gcc/rtl.h:1896
0x13e0ae8 rhs_regno
/repo/gcc-trunk/gcc/rtl.h:1447
0x13e0ae8 try_combine
/repo/gcc-trunk/gcc/combine.c:4291
0x13e6682 combine_instructions
/repo/gcc-trunk/gcc/combine.c:1320
0x13e6682 rest_of_handle_combine
/repo/gcc-trunk/gcc/combine.c:14886
0x13e6682 execute
/repo/gcc-trunk/gcc/combine.c:14931
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ aarch64-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-aarch64/bin/aarch64-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-258241-checking-yes-rtl-df-extra-aarch64/bin/../libexec/gcc/aarch64-unknown-linux-gnu/8.0.1/lto-wrapper
Target: aarch64-unknown-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--with-cloog --with-ppl --with-isl
--with-sysroot=/usr/aarch64-unknown-linux-gnu --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=aarch64-unknown-linux-gnu
--with-ld=/usr/bin/aarch64-unknown-linux-gnu-ld
--with-as=/usr/bin/aarch64-unknown-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-258241-checking-yes-rtl-df-extra-aarch64
Thread model: posix
gcc version 8.0.1 20180305 (experimental) (GCC)
Tested revisions:
r258241 - ICE
r258075 - ICE
7-branch r258055 - OK
>From gcc-bugs-return-596145-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 12:13:17 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84701] casting to ( unsigned typeof(variable) ) gives wrong results
Date: Mon, 05 Mar 2018 12:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84701
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think this should be rejected, just like:
typedef int T;
unsigned T i;
You can combine unsigned with int (or char, or long, or short) to refer to a
type, but not use it to modify an existing type.
You make_unsigned_t<typeof(s)> to do that.
>From gcc-bugs-return-596147-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 12:21:22 2018
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Subject: [Bug c++/84694] [8 Regression] internal compiler error: tree check: expected tree that contains 'decl minimal' structure, have 'identifier_node' in do_friend, at cp/friend.c:498
Date: Mon, 05 Mar 2018 12:21:00 -0000
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Nathan Sidwell <nathan at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|NEW |ASSIGNED
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From: "nathan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84702] [8 Regression] internal compiler error: in tsubst_copy, at cp/pt.c:15082
Date: Mon, 05 Mar 2018 12:22:00 -0000
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Nathan Sidwell <nathan at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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>From gcc-bugs-return-596149-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 12:23:08 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84709] Cannot define method with same name of previously using declared class
Date: Mon, 05 Mar 2018 12:23:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|UNCONFIRMED |RESOLVED
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Proper testcase that actually shows the error:
namespace A {
class Foo {
};
}
using A::Foo;
namespace B {
class Bar {
const Foo &Foo() const;
};
}
hide.cc:10:22: error: declaration of ‘const A::Foo& B::Bar::Foo() const’
[-fpermissive]
const Foo &Foo() const;
^~~~~
hide.cc:2:9: error: changes meaning of ‘Foo’ from ‘class A::Foo’ [-fpermissive]
class Foo {
^~~
Which can be reduced to:
struct Foo { };
struct Bar {
const Foo &Foo() const;
};
The member function B::Bar::foo does hide ::Foo, and that violates
[basic.scope.class]/2.
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/84684] inserting random code / flags produces wrong code
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Strange that if I try to get rid of the system headers with:
typedef decltype (sizeof (0)) size_t;
typedef unsigned char uint8_t;
namespace std {
template<class _E>
class initializer_list
{
public:
typedef _E value_type;
typedef const _E& reference;
typedef const _E& const_reference;
typedef size_t size_type;
typedef const _E* iterator;
typedef const _E* const_iterator;
iterator _M_array;
size_type _M_len;
constexpr initializer_list(const_iterator __a, size_type __l)
: _M_array(__a), _M_len(__l) { }
constexpr initializer_list() noexcept
: _M_array(0), _M_len(0) { }
constexpr size_type
size() const noexcept { return _M_len; }
constexpr const_iterator
begin() const noexcept { return _M_array; }
constexpr const_iterator
end() const noexcept { return begin() + size(); }
};
}
template <typename E, size_t N>
struct array
{
constexpr E &operator[](size_t n) noexcept { return elems[n]; }
constexpr const E &operator[](size_t n) const noexcept { return elems[n]; }
constexpr size_t size() const { return N; }
E elems[N];
};
template<typename T>
constexpr
inline T
max (std::initializer_list<T> i)
{
const T *b = i.begin ();
const T *e = i.end ();
if (b == e) return *b;
const T *r = b;
while (++b != e)
if (*r < *b)
r = b;
return *r;
}
template <typename alphabet_type>
constexpr char to_char(alphabet_type const alph)
{
return alph.to_char();
}
template <typename ...alphabet_types>
struct union_composition
{
static constexpr size_t value_size = (alphabet_types::value_size + ... );
uint8_t _value;
template <size_t fixed_size, typename alphabet_t>
static constexpr auto value_to_char_helper(alphabet_t alphabet)
{
array<char, fixed_size> value_to_char{};
for (size_t i = 0u; i < alphabet_t::value_size; ++i) {
value_to_char[i] = to_char(alphabet.assign_rank(i));
}
return value_to_char;
}
static constexpr auto make_value_to_char()
{
constexpr auto N = sizeof...(alphabet_types);
constexpr array<size_t, N> alphabet_sizes
{
alphabet_types::value_size...
};
constexpr size_t fixed_size = max({alphabet_types::value_size...});
array value_to_char_tables = array<array<char, fixed_size>, N>
{
value_to_char_helper<fixed_size>(alphabet_types{})...
};
array<char, value_size> value_to_char{};
for (size_t i = 0u, value = 0u; i < N; ++i)
for (size_t k = 0u; k < alphabet_sizes[i]; ++k, ++value)
value_to_char[value] = value_to_char_tables[i][k];
return value_to_char;
}
};
struct gap
{
constexpr char to_char() const noexcept
{
return '-';
}
constexpr gap & assign_rank([[maybe_unused]] bool const i) noexcept
{
return *this;
}
static constexpr size_t value_size{1};
};
struct dna4
{
constexpr char to_char() const noexcept
{
return value_to_char[_value];
}
constexpr dna4 & assign_rank(uint8_t const c)
{
_value = c;
return *this;
}
static constexpr size_t value_size{4};
static constexpr char value_to_char[value_size] { 'A', 'C', 'G', 'T' };
uint8_t _value;
};
struct dna5
{
constexpr char to_char() const noexcept
{
return value_to_char[_value];
}
constexpr dna5 & assign_rank(uint8_t const c)
{
_value = c;
return *this;
}
static constexpr size_t value_size{5};
static constexpr char value_to_char[value_size] { 'A', 'C', 'G', 'T', 'N'
};
uint8_t _value;
};
int main()
{
constexpr array value_to_char1 =
union_composition<dna4>::make_value_to_char();
static_assert(value_to_char1.size() == 4u);
static_assert(value_to_char1[0] == 'A');
static_assert(value_to_char1[1] == 'C');
static_assert(value_to_char1[2] == 'G');
static_assert(value_to_char1[3] == 'T');
constexpr array value_to_char2 = union_composition<dna4,
gap>::make_value_to_char();
static_assert(value_to_char2.size() == 5u);
static_assert(value_to_char2[0] == 'A');
static_assert(value_to_char2[1] == 'C');
static_assert(value_to_char2[2] == 'G');
static_assert(value_to_char2[3] == 'T');
static_assert(value_to_char2[4] == '-');
constexpr array value_to_char3 = union_composition<dna4, gap,
dna5>::make_value_to_char();
static_assert(value_to_char3.size() == 10u);
static_assert(value_to_char3[0] == 'A');
static_assert(value_to_char3[1] == 'C');
static_assert(value_to_char3[2] == 'G');
static_assert(value_to_char3[3] == 'T');
static_assert(value_to_char3[4] == '-');
static_assert(value_to_char3[5] == 'A');
static_assert(value_to_char3[6] == 'C');
static_assert(value_to_char3[7] == 'G');
static_assert(value_to_char3[8] == 'T');
static_assert(value_to_char3[9] == 'N');
constexpr array value_to_char4 = union_composition<dna5, gap,
dna4>::make_value_to_char();
static_assert(value_to_char4.size() == 10u);
static_assert(value_to_char4[0] == 'A');
static_assert(value_to_char4[1] == 'C');
static_assert(value_to_char4[2] == 'G');
static_assert(value_to_char4[3] == 'T');
static_assert(value_to_char4[4] == 'N');
static_assert(value_to_char4[5] == '-');
static_assert(value_to_char4[6] == 'A');
static_assert(value_to_char4[7] == 'C');
static_assert(value_to_char4[8] == 'G');
static_assert(value_to_char4[9] == 'T');
constexpr array value_to_char5 = union_composition<gap, dna4,
dna5>::make_value_to_char();
static_assert(value_to_char5.size() == 10u);
static_assert(value_to_char5[0] == '-');
static_assert(value_to_char5[1] == 'A');
static_assert(value_to_char5[2] == 'C');
static_assert(value_to_char5[3] == 'G');
static_assert(value_to_char5[4] == 'T');
static_assert(value_to_char5[5] == 'A');
static_assert(value_to_char5[6] == 'C');
static_assert(value_to_char5[7] == 'G');
static_assert(value_to_char5[8] == 'T');
static_assert(value_to_char5[9] == 'N');
}
the errors go away. Or if I remove int main () { and }, i.e. keep the
static_asserts at the toplevel, it fails, but in different spots than when it
is in main.
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Subject: [Bug c++/84702] [8 Regression] internal compiler error: in tsubst_copy, at cp/pt.c:15082
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Subject: [Bug c++/84704] [8 Regression] internal compiler error: gimplification failed
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Subject: [Bug c++/84705] [6/7/8 Regression] internal compiler error: in add_stmt, at cp/semantics.c:390
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/80245] Ambiguous operator() call on class with ambiguous base classes treated as hard error in SFINAE context
Date: Mon, 05 Mar 2018 12:33:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Resolution|--- |DUPLICATE
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced:
struct B { void operator()(char){} };
template <int>
struct base : B {};
struct ob : base<0>, base<1>
{
using base<0>::operator(); // char
using base<1>::operator(); // char
};
template <class...>
using void_t = void;
template <class, class = void>
struct is_ambiguous { };
template <class T>
struct is_ambiguous<T, void_t<decltype(T{}('a'))>> { };
is_ambiguous<ob> test;
ambig.cc: In instantiation of 'struct is_ambiguous<ob>':
ambig.cc:21:18: required from here
ambig.cc:19:43: error: 'B' is an ambiguous base of 'ob'
struct is_ambiguous<T, void_t<decltype(T{}('a'))>> { };
~~~^~~~~
ambig.cc:19:43: error: 'B' is an ambiguous base of 'ob'
> The request for an ambiguous member function call produces a SFINAE-friendly
> context on `clang++5`, allowing the `is_ambiguous` detection to properly
> take place.
I don't think the problem for GCC is that it's not a SFINAE-friendly context,
it's that it gives a different answer in the SFINAE context and when
instantiated. So this is the same as PR 84689.
*** This bug has been marked as a duplicate of bug 84689 ***
>From gcc-bugs-return-596158-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 12:34:44 2018
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Subject: [Bug c++/84707] [8 Regression] internal compiler error: Segmentation fault (tree_check()/duplicate_decls())
Date: Mon, 05 Mar 2018 12:34:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug c++/84689] is_invocable is true even for call operator via ambiguous base
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |vittorio.romeo at outlook dot com
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 80245 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-596157-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 12:34:33 2018
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From: "tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84711] New: AArch32 big-endian fails when taking subreg of a vector mode to a scalar mode.
Date: Mon, 05 Mar 2018 12:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84711
Bug ID: 84711
Summary: AArch32 big-endian fails when taking subreg of a
vector mode to a scalar mode.
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: tnfchris at gcc dot gnu.org
Reporter: tnfchris at gcc dot gnu.org
Target Milestone: ---
Target: armeb-*-*
The following example
typedef __fp16 v4f16
__attribute__ ((vector_size (8)));
v4f16 fn1 (v4f16 p)
{
return p;
}
fails only on arm big-endian when using `-mfpu=neon -mfloat-abi=hard
-mfp16-format=ieee -mbig-endian` and results in an ICE.
This case triggers an endless recursion in the mid-end when taking the subreg
and eventually segfaults when it runs out of stack space.
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Subject: [Bug tree-optimization/84670] [8 Regression] ICE: in compute_antic_aux, at tree-ssa-pre.c:2148 with -O2 -fno-tree-dominator-opts
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84670
Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 84706 has been marked as a duplicate of this bug. ***
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Subject: [Bug target/84711] AArch32 big-endian fails when taking subreg of a vector mode to a scalar mode.
Date: Mon, 05 Mar 2018 12:35:00 -0000
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Tamar Christina <tnfchris at gcc dot gnu.org> changed:
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--- Comment #1 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Currently have a patch for it, will submit it on stage-1 for GCC 9 as this is
not an 8 regression.
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Subject: [Bug tree-optimization/84706] [8 Regression] Ada bootstrap fails on s390x since r258124
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Dup.
*** This bug has been marked as a duplicate of bug 84670 ***
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Subject: [Bug tree-optimization/84670] [8 Regression] ICE: in compute_antic_aux, at tree-ssa-pre.c:2148 with -O2 -fno-tree-dominator-opts
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 84696 has been marked as a duplicate of this bug. ***
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Subject: [Bug tree-optimization/84670] [8 Regression] ICE: in compute_antic_aux, at tree-ssa-pre.c:2148 with -O2 -fno-tree-dominator-opts
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Bug 84670 depends on bug 84696, which changed state.
Bug 84696 Summary: [8 Regression] ICE in compute_antic_aux, at tree-ssa-pre.c:2148
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84696
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Subject: [Bug tree-optimization/84696] [8 Regression] ICE in compute_antic_aux, at tree-ssa-pre.c:2148
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Dup.
*** This bug has been marked as a duplicate of bug 84670 ***
>From gcc-bugs-return-596162-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 12:36:06 2018
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Subject: [Bug c++/84684] inserting random code / flags produces wrong code
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #3)
> the errors go away. Or if I remove int main () { and }, i.e. keep the
> static_asserts at the toplevel, it fails, but in different spots than when
> it is in main.
Yes, that's what made me suspect something uninitialized and try valgrind.
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From: "tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/84711] AArch32 big-endian fails when taking subreg of a vector mode to a scalar mode.
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Tamar Christina <tnfchris at gcc dot gnu.org> changed:
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From: "amker at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/83983] FAIL: g++.dg/lto/pr83121 (test for LTO warnings, pr83121_0.C line 8)
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amker at gcc dot gnu.org changed:
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--- Comment #8 from amker at gcc dot gnu.org ---
(In reply to Eric Botcazou from comment #6)
> > In other words, get_odr_type (t1, true) works on x86 and get_odr_type (t2,
> > true) works on ARM/SPARC, so maybe something like:
> >
> > Index: ipa-devirt.c
> > ===================================================================
> > --- ipa-devirt.c (revision 258068)
> > +++ ipa-devirt.c (working copy)
> > @@ -686,7 +686,10 @@ odr_subtypes_equivalent_p (tree t1, tree t2,
> > return false;
> > /* Limit recursion: If subtypes are ODR types and we know
> > that they are same, be happy. */
> > - if (!odr_type_p (t1) || !get_odr_type (t1, true)->odr_violated)
> > + if (!odr_type_p (t1)
> > + || !odr_type_p (t2)
> > + || (!get_odr_type (t1, true)->odr_violated
> > + && !get_odr_type (t2, true)->odr_violated))
> > return true;
> > }
> >
> > is the proper thing to do.
>
> This brings the missing warnings on SPARC (and presumably Aarch64 too) but
> gives the same order of warnings as on the HP-PA, so the test still formally
> fails.
>
> In other words, the test is not sufficiently robust as currently written.
Yes, now on AArch64, we have:
/.../build/src/gcc/gcc/testsuite/g++.dg/lto/pr83121_0.C:7:10: warning: type
'struct AsyncHooks' violates the C++ One Definition Rule [-Wodr]^M
/.../build/src/gcc/gcc/testsuite/g++.dg/lto/pr83121_1.C:2:10: note: a different
type is defined in another translation unit^M
/.../build/src/gcc/gcc/testsuite/g++.dg/lto/pr83121_0.C:8:21: note: the first
difference of corresponding definitions is field 'providers_'^M
/.../build/src/gcc/gcc/testsuite/g++.dg/lto/pr83121_1.C:3:21: note: a field of
same name but different type is defined in another translation unit^M
/.../build/src/gcc/gcc/testsuite/g++.dg/lto/pr83121_0.C:7:10: note: array types
have different bounds^M
/.../build/src/gcc/gcc/testsuite/g++.dg/lto/pr83121_0.C:6:8: warning: type
'struct Environment' violates the C++ One Definition Rule [-Wodr]^M
/.../build/src/gcc/gcc/testsuite/g++.dg/lto/pr83121_1.C:1:8: note: a different
type is defined in another translation unit^M
/.../build/src/gcc/gcc/testsuite/g++.dg/lto/pr83121_0.C:10:14: note: the first
difference of corresponding definitions is field 'async_hooks_'^M
/.../build/src/gcc/gcc/testsuite/g++.dg/lto/pr83121_1.C:5:14: note: a field of
same name but different type is defined in another translation unit^M
/.../build/src/gcc/gcc/testsuite/g++.dg/lto/pr83121_0.C:7:10: note: type
'struct AsyncHooks' itself violates the C++ One Definition Rule^M
/.../build/src/gcc/gcc/testsuite/g++.dg/lto/pr83121_1.C:2:10: note: the
incompatible type is defined here^M
FAIL: g++.dg/lto/pr83121 (test for LTO warnings, pr83121_0.C line 8)
FAIL: g++.dg/lto/pr83121 (test for LTO warnings, pr83121_1.C line 2)
FAIL: g++.dg/lto/pr83121 (test for LTO warnings, pr83121_1.C line 3)
FAIL: g++.dg/lto/pr83121 cp_lto_pr83121_0.o-cp_lto_pr83121_1.o link, -O0 -flto
>From gcc-bugs-return-596168-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 12:49:17 2018
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84684] inserting random code / flags produces wrong code
Date: Mon, 05 Mar 2018 12:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84684
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Or also defining another method in union_composition, like:
static constexpr auto make_value_to_char1()
{
constexpr auto N = sizeof...(alphabet_types);
return N;
}
makes it go away.
>From gcc-bugs-return-596169-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 12:49:31 2018
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From: "prathamesh3492 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84712] New: Missed evaluating to constant at tree level
Date: Mon, 05 Mar 2018 12:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84712
Bug ID: 84712
Summary: Missed evaluating to constant at tree level
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: prathamesh3492 at gcc dot gnu.org
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Hi,
It seems GCC does not evaluate the following function to a constant at the tree
level:
int sum(void)
{
int a[] = {1, 2, 3, -1};
int x = 0;
for (int i = 0; i < 4; i++)
if (a[i] < 0)
break;
else
x += a[i];
return x;
}
optimized dump shows:
sum ()
{
int x;
int a[4];
int _25;
int _33;
int _41;
<bb 2> [local count: 261993005]:
MEM[(int *)&a] = { 1, 2, 3, -1 };
_25 = a[1];
if (_25 < 0)
goto <bb 5>; [7.91%]
else
goto <bb 3>; [92.09%]
<bb 3> [local count: 246744733]:
x_30 = _25 + 1;
_33 = a[2];
if (_33 < 0)
goto <bb 5>; [7.91%]
else
goto <bb 4>; [92.09%]
<bb 4> [local count: 232383926]:
x_38 = x_30 + _33;
_41 = a[3];
if (_41 < 0)
goto <bb 5>; [7.91%]
else
goto <bb 6>; [92.09%]
<bb 5> [local count: 47244641]:
# x_17 = PHI <x_30(3), 1(2), x_38(4)>
goto <bb 7>; [100.00%]
<bb 6> [local count: 218858940]:
x_10 = x_38 + _41;
<bb 7> [local count: 261993005]:
# x_2 = PHI <x_17(5), x_10(6)>
a ={v} {CLOBBER};
return x_2;
}
However at RTL, cprop seems to do the constant folding and set return value
register to 6.
Thanks,
Prathamesh
>From gcc-bugs-return-596170-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 12:49:43 2018
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Subject: [Bug tree-optimization/84650] [8 Regression] [graphite] ICE: Segmentation fault (in create_new_iv)
Date: Mon, 05 Mar 2018 12:49:00 -0000
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--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Mar 5 12:49:07 2018
New Revision: 258242
URL: https://gcc.gnu.org/viewcvs?rev=258242&root=gcc&view=rev
Log:
2018-03-05 Richard Biener <rguenther@suse.de>
PR tree-optimization/84650
* tree-ssa-loop-im.c (pass_lim::execute): Reset the SCEV cache
if executed in the loop pipeline.
* gcc.dg/graphite/pr84650.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/graphite/pr84650.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-loop-im.c
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Subject: [Bug rtl-optimization/84713] New: ANY_RETURN_P does't check all SIMPLE_RETURNs
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Bug ID: 84713
Summary: ANY_RETURN_P does't check all SIMPLE_RETURNs
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rtl.h has
/* Predicate yielding nonzero iff X is a return or simple_return. */
#define ANY_RETURN_P(X) \
(GET_CODE (X) == RETURN || GET_CODE (X) == SIMPLE_RETURN)
But on x86, for
void
__attribute__((interrupt))
fn (void* frame)
{
}
we generate:
(jump_insn 13 12 14 2 (parallel [
(simple_return)
(unspec [
(const_int 0 [0])
] UNSPEC_INTERRUPT_RETURN)
]) "/tmp/y.i":5 -1
(nil)
-> simple_return)
But ANY_RETURN_P returns false.
>From gcc-bugs-return-596171-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 12:50:48 2018
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Subject: [Bug c++/84707] [8 Regression] internal compiler error: Segmentation fault (tree_check()/duplicate_decls())
Date: Mon, 05 Mar 2018 12:50:00 -0000
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
It really seems all we need is
--- a/gcc/cp/decl.c
+++ b/gcc/cp/decl.c
@@ -1410,7 +1410,9 @@ duplicate_decls (tree newdecl, tree olddecl, bool
newdecl_is_friend)
|| TREE_TYPE (olddecl) == error_mark_node)
return error_mark_node;
- if (UDLIT_OPER_P (DECL_NAME (newdecl))
+ if (DECL_NAME (newdecl)
+ && DECL_NAME (olddecl)
+ && UDLIT_OPER_P (DECL_NAME (newdecl))
&& UDLIT_OPER_P (DECL_NAME (olddecl)))
{
if (TREE_CODE (newdecl) == TEMPLATE_DECL
then we give a nice error:
84707.C:5:1: error: ‘namespace { }’ conflicts with a previous declaration
namespace {}
^~~~~~~~~
84707.C:1:8: note: previous declaration ‘namespace { }’
inline namespace {
^~~~~~~~~
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Subject: [Bug c++/84707] [8 Regression] internal compiler error: Segmentation fault (tree_check()/duplicate_decls())
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org
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Subject: [Bug c++/84684] inserting random code / flags produces wrong code
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--- Comment #6 from gcc-bugs at marehr dot dialup.fu-berlin.de ---
I use now a more simpler approach for the fold expression [1], but the problem
from this bug ticket still persisted when I used the same kind of assignment:
for (size_t i = 0u; i < alphabet_t::value_size; ++i) {
value_to_char[i] = to_char(alphabet.assign_rank(i));
}
Extracting the rhs into a external lambda function
auto assign_rank_to_char = [](auto alphabet, size_t rank) constexpr
{
return seqan3::to_char(seqan3::assign_rank(alphabet, rank));
};
...
for (size_t i = 0u; i < alphabet_t::value_size; ++i) {
value_to_char[i] = assign_rank_to_char(alphabet, i);
}
Seems to resolve the problem for me and our build systems. I'm eager to know
which edge case I triggered here :)
[1]
https://github.com/marehr/seqan3/blob/0aa304d9a4bc81eb52dd144f3da5fd38330408fc/include/seqan3/alphabet/composition/union_composition.hpp#L362-L389
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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84712] Missed evaluating to constant at tree level
Date: Mon, 05 Mar 2018 13:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84712
--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
We unroll quite late (cunroll) and there aren't any passes (like FRE) after
that to do the propagation. Adding #pragma GCC unroll 16 before the loop lets
it optimize.
>From gcc-bugs-return-596176-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 13:18:50 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84670] [8 Regression] ICE: in compute_antic_aux, at tree-ssa-pre.c:2148 with -O2 -fno-tree-dominator-opts
Date: Mon, 05 Mar 2018 13:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84670
--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Mar 5 13:18:12 2018
New Revision: 258243
URL: https://gcc.gnu.org/viewcvs?rev=258243&root=gcc&view=rev
Log:
2018-03-05 Richard Biener <rguenther@suse.de>
PR tree-optimization/84670
* tree-ssa-pre.c (struct bb_bitmap_sets): Add
visited_with_visited_succs
member.
(BB_VISITED_WITH_VISITED_SUCCS): New define.
(compute_antic): Initialize BB_VISITED_WITH_VISITED_SUCCS.
(compute_antic_aux): Only assert the number of values in ANTIC_IN
doesn't grow if all successors (recursively) were visited at least
once.
* gcc.dg/pr84670-1.c: New testcase.
* gcc.dg/pr84670-2.c: Likewise.
* gcc.dg/pr84670-3.c: Likewise.
* gcc.dg/pr84670-4.c: Likewise.
Added:
trunk/gcc/testsuite/gcc.dg/pr84670-1.c
trunk/gcc/testsuite/gcc.dg/pr84670-2.c
trunk/gcc/testsuite/gcc.dg/pr84670-3.c
trunk/gcc/testsuite/gcc.dg/pr84670-4.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-pre.c
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84670] [8 Regression] ICE: in compute_antic_aux, at tree-ssa-pre.c:2148 with -O2 -fno-tree-dominator-opts
Date: Mon, 05 Mar 2018 13:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84670
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
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From: "vegard.nossum at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84714] New: internal compiler error: in create_tmp_var, at gimple-expr.c:476
Date: Mon, 05 Mar 2018 13:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84714
Bug ID: 84714
Summary: internal compiler error: in create_tmp_var, at
gimple-expr.c:476
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Keywords: ice-on-invalid-code
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vegard.nossum at gmail dot com
CC: webrown.cpp at gmail dot com
Target Milestone: ---
Input:
void a(struct b &c) {
asm ("" : "+r" (c));
}
Output:
$ xgcc -x c++ -S -
<stdin>: In function 'void a(b&)':
<stdin>:2:19: internal compiler error: in create_tmp_var, at gimple-expr.c:476
0x20f1583 create_tmp_var(tree_node*, char const*)
/home/vegard/git/gcc/gcc/gimple-expr.c:476
0x2218dd6 create_tmp_from_val
/home/vegard/git/gcc/gcc/gimplify.c:516
0x2218dd6 lookup_tmp_var
/home/vegard/git/gcc/gcc/gimplify.c:537
0x2218dd6 internal_get_tmp_var
/home/vegard/git/gcc/gcc/gimplify.c:590
0x221b55c get_formal_tmp_var(tree_node*, gimple**)
/home/vegard/git/gcc/gcc/gimplify.c:618
0x221b55c gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
/home/vegard/git/gcc/gcc/gimplify.c:12383
0x22469bd gimplify_asm_expr
/home/vegard/git/gcc/gcc/gimplify.c:6328
0x221cc11 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
/home/vegard/git/gcc/gcc/gimplify.c:11766
0x222b991 gimplify_stmt(tree_node**, gimple**)
/home/vegard/git/gcc/gcc/gimplify.c:6658
0x221da9d gimplify_cleanup_point_expr
/home/vegard/git/gcc/gcc/gimplify.c:6400
0x221da9d gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
/home/vegard/git/gcc/gcc/gimplify.c:11811
0x222b991 gimplify_stmt(tree_node**, gimple**)
/home/vegard/git/gcc/gcc/gimplify.c:6658
0x2234c59 gimplify_body(tree_node*, bool)
/home/vegard/git/gcc/gcc/gimplify.c:12635
0x2236fb0 gimplify_function_tree(tree_node*)
/home/vegard/git/gcc/gcc/gimplify.c:12800
0x19a3517 cgraph_node::analyze()
/home/vegard/git/gcc/gcc/cgraphunit.c:670
0x19b65eb analyze_functions
/home/vegard/git/gcc/gcc/cgraphunit.c:1131
0x19bb301 symbol_table::finalize_compilation_unit()
/home/vegard/git/gcc/gcc/cgraphunit.c:2691
$ xgcc --version
xgcc (GCC) 8.0.1 20180303 (experimental)
Built from git 0d86c284d085d29782d862600a79aa1ff0ee0c47 (r258221).
4.1.2 gives the same thing.
Clang gives:
input.cc:2:19: error: dereference of pointer to incomplete type 'struct b'
asm ("" : "+r" (c));
^
input.cc:1:15: note: forward declaration of 'b'
void a(struct b &c) {
^
1 error generated.
Test case was minimised by C-Reduce.
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Subject: [Bug c++/84684] inserting random code / flags produces wrong code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84684
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
#include <array>
#include <algorithm>
template <typename alphabet_type>
constexpr char to_char(alphabet_type const alph)
{
return alph.to_char();
}
constexpr const char *check[][3] = {
{ "ACGT", __null, __null },
{ "ACGT", "-", __null },
{ "ACGT", "-", "ACGTN" },
{ "ACGTN", "-", "ACGT" },
{ "-", "ACGT", "ACGTN" } };
template <int idx, typename ...alphabet_types>
struct union_composition
{
static constexpr size_t value_size = (alphabet_types::value_size + ... );
uint8_t _value;
template <size_t fixed_size, typename alphabet_t>
static constexpr auto value_to_char_helper(alphabet_t alphabet)
{
std::array<char, fixed_size> value_to_char{};
for (size_t i = 0u; i < alphabet_t::value_size; ++i) {
value_to_char[i] = to_char(alphabet.assign_rank(i));
}
return value_to_char;
}
static constexpr auto make_value_to_char()
{
constexpr auto N = sizeof...(alphabet_types);
constexpr std::array<size_t, N> alphabet_sizes
{
alphabet_types::value_size...
};
constexpr size_t fixed_size =
std::max({alphabet_types::value_size...});
constexpr std::array value_to_char_tables = std::array<std::array<char,
fixed_size>, N>
{
value_to_char_helper<fixed_size>(alphabet_types{})...
};
std::array<char, value_size> value_to_char{};
static_assert (value_size == (idx == 0 ? 4 : (idx < 2 ? 5 : 10)));
static_assert (N == (idx == 0 ? 1 : (idx < 2 ? 2 : 3)));
static_assert (fixed_size == (idx < 2 ? 4 : 5));
static_assert (alphabet_sizes[0] == __builtin_strlen(check[idx][0]));
if constexpr(idx >= 1)
static_assert (alphabet_sizes[1] == __builtin_strlen(check[idx][1]));
if constexpr (idx >= 2)
static_assert (alphabet_sizes[2] == __builtin_strlen(check[idx][2]));
static_assert (value_to_char_tables[0][0] == check[idx][0][0]);
if constexpr (alphabet_sizes[0] > 1)
static_assert (value_to_char_tables[0][1] == check[idx][0][1]);
if constexpr (alphabet_sizes[0] > 2)
static_assert (value_to_char_tables[0][2] == check[idx][0][2]);
if constexpr (alphabet_sizes[0] > 3)
static_assert (value_to_char_tables[0][3] == check[idx][0][3]);
if constexpr (alphabet_sizes[0] > 4)
static_assert (value_to_char_tables[0][4] == check[idx][0][4]);
if constexpr (idx >= 1) {
static_assert (value_to_char_tables[1][0] == check[idx][1][0]);
if constexpr (alphabet_sizes[1] > 1)
static_assert (value_to_char_tables[1][1] == check[idx][1][1]);
if constexpr (alphabet_sizes[1] > 2)
static_assert (value_to_char_tables[1][2] == check[idx][1][2]);
if constexpr (alphabet_sizes[1] > 3)
static_assert (value_to_char_tables[1][3] == check[idx][1][3]);
if constexpr (alphabet_sizes[1] > 4)
static_assert (value_to_char_tables[1][4] == check[idx][1][4]);
}
if constexpr (idx >= 2) {
static_assert (value_to_char_tables[2][0] == check[idx][2][0]);
if constexpr (alphabet_sizes[2] > 1)
static_assert (value_to_char_tables[2][1] == check[idx][2][1]);
if constexpr (alphabet_sizes[2] > 2)
static_assert (value_to_char_tables[2][2] == check[idx][2][2]);
if constexpr (alphabet_sizes[2] > 3)
static_assert (value_to_char_tables[2][3] == check[idx][2][3]);
if constexpr (alphabet_sizes[2] > 4)
static_assert (value_to_char_tables[2][4] == check[idx][2][4]);
}
for (size_t i = 0u, value = 0u; i < N; ++i)
for (size_t k = 0u; k < alphabet_sizes[i]; ++k, ++value)
value_to_char[value] = value_to_char_tables[i][k];
return value_to_char;
}
};
struct gap
{
constexpr char to_char() const noexcept
{
return '-';
}
constexpr gap & assign_rank([[maybe_unused]] bool const i) noexcept
{
return *this;
}
static constexpr size_t value_size{1};
};
struct dna4
{
constexpr char to_char() const noexcept
{
return value_to_char[_value];
}
constexpr dna4 & assign_rank(uint8_t const c)
{
_value = c;
return *this;
}
static constexpr size_t value_size{4};
static constexpr char value_to_char[value_size] { 'A', 'C', 'G', 'T' };
uint8_t _value;
};
struct dna5
{
constexpr char to_char() const noexcept
{
return value_to_char[_value];
}
constexpr dna5 & assign_rank(uint8_t const c)
{
_value = c;
return *this;
}
static constexpr size_t value_size{5};
static constexpr char value_to_char[value_size] { 'A', 'C', 'G', 'T', 'N'
};
uint8_t _value;
};
constexpr std::array value_to_char1 = union_composition<0,
dna4>::make_value_to_char();
static_assert(value_to_char1.size() == 4u);
static_assert(value_to_char1[0] == 'A');
static_assert(value_to_char1[1] == 'C');
static_assert(value_to_char1[2] == 'G');
static_assert(value_to_char1[3] == 'T');
constexpr std::array value_to_char2 = union_composition<1, dna4,
gap>::make_value_to_char();
static_assert(value_to_char2.size() == 5u);
static_assert(value_to_char2[0] == 'A');
static_assert(value_to_char2[1] == 'C');
static_assert(value_to_char2[2] == 'G');
static_assert(value_to_char2[3] == 'T');
static_assert(value_to_char2[4] == '-');
constexpr std::array value_to_char3 = union_composition<2, dna4, gap,
dna5>::make_value_to_char();
static_assert(value_to_char3.size() == 10u);
static_assert(value_to_char3[0] == 'A');
static_assert(value_to_char3[1] == 'C');
static_assert(value_to_char3[2] == 'G');
static_assert(value_to_char3[3] == 'T');
static_assert(value_to_char3[4] == '-');
static_assert(value_to_char3[5] == 'A');
static_assert(value_to_char3[6] == 'C');
static_assert(value_to_char3[7] == 'G');
static_assert(value_to_char3[8] == 'T');
static_assert(value_to_char3[9] == 'N');
constexpr std::array value_to_char4 = union_composition<3, dna5, gap,
dna4>::make_value_to_char();
static_assert(value_to_char4.size() == 10u);
static_assert(value_to_char4[0] == 'A');
static_assert(value_to_char4[1] == 'C');
static_assert(value_to_char4[2] == 'G');
static_assert(value_to_char4[3] == 'T');
static_assert(value_to_char4[4] == 'N');
static_assert(value_to_char4[5] == '-');
static_assert(value_to_char4[6] == 'A');
static_assert(value_to_char4[7] == 'C');
static_assert(value_to_char4[8] == 'G');
static_assert(value_to_char4[9] == 'T');
constexpr std::array value_to_char5 = union_composition<4, gap, dna4,
dna5>::make_value_to_char();
static_assert(value_to_char5.size() == 10u);
static_assert(value_to_char5[0] == '-');
static_assert(value_to_char5[1] == 'A');
static_assert(value_to_char5[2] == 'C');
static_assert(value_to_char5[3] == 'G');
static_assert(value_to_char5[4] == 'T');
static_assert(value_to_char5[5] == 'A');
static_assert(value_to_char5[6] == 'C');
static_assert(value_to_char5[7] == 'G');
static_assert(value_to_char5[8] == 'T');
static_assert(value_to_char5[9] == 'N');
when preprocessed with -E -std=c++17 with g++ 7.3.1 and compiled with
-std=c++17 trunk gives:
./cc1plus -quiet -std=c++17 pr84684-6.ii
pr84684-6.C: In instantiation of ‘static constexpr auto union_composition<idx,
alphabet_types>::make_value_to_char() [with int idx = 0; alphabet_types =
{dna4}]’:
pr84684-6.C:152:67: required from here
pr84684-6.C:64:43: error: static assertion failed
static_assert (value_to_char_tables[0][2] == check[idx][0][2]);
pr84684-6.C:156:33: error: static assertion failed
static_assert(value_to_char1[2] == 'G');
>From gcc-bugs-return-596180-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 13:31:10 2018
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Subject: [Bug middle-end/84019] [7/8 regression] ICE in fold-const of std::complex division
Date: Mon, 05 Mar 2018 13:31:00 -0000
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Allan Jensen <linux at carewolf dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #9 from Allan Jensen <linux at carewolf dot com> ---
I now have trouble reproducing it. Let's assume for now my configuration was
wrong at the time this was still reproducable for me.
>From gcc-bugs-return-596181-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 13:38:59 2018
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Subject: [Bug c++/84684] inserting random code / flags produces wrong code
Date: Mon, 05 Mar 2018 13:38:00 -0000
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--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43562
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43562&action=edit
pr84684-7.ii
Even with this simplified version I still get:
pr84684-6.C: In instantiation of ‘static constexpr auto union_composition<idx,
alphabet_types>::make_value_to_char() [with int idx = 0; alphabet_types =
{dna4}]’:
pr84684-6.C:79:67: required from here
pr84684-6.C:43:47: error: static assertion failed
};
pr84684-6.C:83:33: error: static assertion failed
static_assert (value_to_char_tables[2][1] == check[idx][2][1]);
with -std=c++17, no errors with -std=c++17 -O2.
>From gcc-bugs-return-596182-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 13:49:20 2018
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Subject: [Bug c++/84497] link errors with trivial external thread_local variables
Date: Mon, 05 Mar 2018 13:49:00 -0000
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--- Comment #4 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Author: nathan
Date: Mon Mar 5 13:48:43 2018
New Revision: 258244
URL: https://gcc.gnu.org/viewcvs?rev=258244&root=gcc&view=rev
Log:
[PR c++/84497] ref to undefined tls init
https://gcc.gnu.org/ml/gcc-patches/2018-03/msg00209.html
PR c++/84497
* decl2.c (get_tls_init_fn): Check TYPE_HAS_TRIVIAL_DFLT too.
PR c++/84497
* g++.dg/cpp0x/pr84497.C: New.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/pr84497.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/decl2.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-596184-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 13:50:02 2018
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Subject: [Bug c++/59994] [meta-bug] thread_local
Date: Mon, 05 Mar 2018 13:50:00 -0000
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Bug 59994 depends on bug 84497, which changed state.
Bug 84497 Summary: link errors with trivial external thread_local variables
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84497
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug c++/84497] link errors with trivial external thread_local variables
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Nathan Sidwell <nathan at gcc dot gnu.org> changed:
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--- Comment #5 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Fixed r258244.
As the generator side of the compiler isn't changed, this isn't an ABI change.
Just a fix for illformed code generation.
>From gcc-bugs-return-596186-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 13:55:30 2018
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Subject: [Bug target/84710] [8 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1896 with -O -fno-forward-propagate
Date: Mon, 05 Mar 2018 13:55:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug tree-optimization/84712] Missed evaluating to constant at tree level
Date: Mon, 05 Mar 2018 13:55:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-05
CC| |rguenth at gcc dot gnu.org
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
DOM value-numbering doesn't know how to fold the read from the constant
initializer. I belive we have dups for this.
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Subject: [Bug fortran/54687] Use gcc option machinery for gfortran
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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----------------------------------------------------------------------------
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--- Comment #13 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
No activity since over two years. Any objection to close this PR as FIXED?
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Subject: [Bug other/84715] New: "./configure --disable-multilib && make" fails due to "g++: error: gengtype-lex.c: No such file or directory"
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84715
Bug ID: 84715
Summary: "./configure --disable-multilib && make" fails due to
"g++: error: gengtype-lex.c: No such file or
directory"
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: other
Assignee: unassigned at gcc dot gnu.org
Reporter: krichter at posteo dot de
Target Milestone: ---
Running `./configure --disable-multilib && make` fails due to
```
g++: error: gengtype-lex.c: No such file or directory
g++: fatal error: no input files
compilation terminated.
make[3]: *** [build/gengtype-lex.o] Error 1
make[3]: *** Waiting for unfinished jobs....
Makefile:2666: recipe for target 'build/gengtype-lex.o' failed
```
on a pretty empty docker image. I recreated the issue on Ubuntu 14.04, 16.04,
17.10 and 18.04 preview as well as Debian oldstable, stable and testing inside
GitLab CI, see https://gitlab.com/krichter/gcc/pipelines/18408388 for details
and
[.gitlab-ci.yml](https://gitlab.com/krichter/gcc/blob/gitlab-ci/.gitlab-ci.yml)
for the build instructions.
In case this is a user error, it'd be nice if `configure` would check that all
conditions for the configured build are fulfilled and otherwise fail with a
helpful error message.
experienced with 4225b5dcdbcadaa3d7605582f735d02b6fc50cdf
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Subject: [Bug fortran/56667] Syntax error causes misleading message: "Expected PARAMETER symbol in complex constant"
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Status|NEW |WAITING
--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
How difficult would it be to provide better message? Is it worth the work? If
no, this PR could be closed as WONTFIX.
>From gcc-bugs-return-596190-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 14:07:36 2018
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Subject: [Bug other/84715] "./configure --disable-multilib && make" fails due to "g++: error: gengtype-lex.c: No such file or directory"
Date: Mon, 05 Mar 2018 14:07:00 -0000
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Don't run ./configure in the source dir:
https://gcc.gnu.org/wiki/FAQ#configure
If you're building a snapshot or modifying the source, you need Flex:
https://gcc.gnu.org/install/prerequisites.html#Tools_002fpackages-necessary-for-modifying-GCC
We don't want the configure script to require flex, because most users don't
need it. If you're building a snapshot (not an official release) or modifying
the source then you're expected to read the docs and install the required
prerequisites.
>From gcc-bugs-return-596191-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 14:12:50 2018
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Subject: [Bug c++/84684] inserting random code / flags produces wrong code
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |mpolacek at gcc dot gnu.org
--- Comment #9 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r257713.
>From gcc-bugs-return-596192-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 14:19:26 2018
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Subject: [Bug c++/84694] [8 Regression] internal compiler error: tree check: expected tree that contains 'decl minimal' structure, have 'identifier_node' in do_friend, at cp/friend.c:498
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Nathan Sidwell <nathan at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
The testcase can be mutated into valid (but useless) code
>From gcc-bugs-return-596193-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 14:25:45 2018
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Subject: [Bug c++/84684] inserting random code / flags produces wrong code
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--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
In the debugger when looking at cxx_eval_call_expression
union_composition<0, dna4>::value_to_char_helper<4, dna4> (TARGET_EXPR
<D.34562, {}>);
I see:
(gdb) p debug_generic_stmt (result)
{._M_elems={65, 67, 67, 84}}
which is 'A', 'C', 'C', 'T'.
When doing cxx_eval_call_expression for the 3rd invocation of:
to_char<dna4> (TARGET_EXPR <D.34725, *(const struct dna4 &) dna4::assign_rank
(&alphabet, (int) (uint8_t) i)>);
(i.e. when alphabet PARM_DECL has the current value of {._value=2}), we somehow
find it in the hash table:
1598 constexpr_call *entry = NULL;
1599 if (depth_ok && !non_constant_args && ctx->strict)
1600 {
1601 new_call.hash = iterative_hash_template_arg
1602 (new_call.bindings, constexpr_fundef_hasher::hash
(new_call.fundef));
1603
1604 /* If we have seen this call before, we are done. */
1605 maybe_initialize_constexpr_call_table ();
1606 constexpr_call **slot
1607 = constexpr_call_table->find_slot (&new_call, INSERT);
1608 entry = *slot;
(i.e. entry is non-NULL) and actually use the cached result instead of
evaluating it again.
debug_tree (new_call.bindings)
<tree_list 0x7fffee728780
purpose <parm_decl 0x7fffee712a00 alph
type <record_type 0x7fffee6d8738 dna4 readonly type_5 QI
size <integer_cst 0x7fffefc45f60 constant 8>
unit-size <integer_cst 0x7fffefc45f78 constant 1>
align:8 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7fffee6d8738 fields <function_decl 0x7fffee713a00 __ct > context
<translation_unit_decl 0x7fffefc52168 pr84684-7.ii>
full-name "const struct dna4"
X() X(constX&) this=(X&) n_parents=0 use_template=0
interface-unknown
pointer_to_this <pointer_type 0x7fffee6d8888> reference_to_this
<reference_type 0x7fffee714540>>
readonly addressable used read QI pr84684-6.C:5:44 size <integer_cst
0x7fffefc45f60 8> unit-size <integer_cst 0x7fffefc45f78 1>
align:8 warn_if_not_align:0 context <function_decl 0x7fffee713300
to_char>
arg-type <record_type 0x7fffee6d8738 dna4>>
value <constructor 0x7fffee727468 type <record_type 0x7fffee6d8738 dna4>
constant length:1
idx <field_decl 0x7fffee6d45f0 _value type <integer_type 0x7fffef1a41f8
uint8_t>
used unsigned nonlocal decl_3 QI pr84684-6.C:67:11 size
<integer_cst 0x7fffefc45f60 8> unit-size <integer_cst 0x7fffefc45f78 1>
align:8 warn_if_not_align:0 offset_align 128
offset <integer_cst 0x7fffefc45ea0 constant 0>
bit-offset <integer_cst 0x7fffefc45ee8 constant 0> context
<record_type 0x7fffee6d8540 dna4> chain <type_decl 0x7fffee6d4558 dna4>>
val <integer_cst 0x7fffee727438 constant 2>>>
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84686] [6/7 Regression] Parenthesized discarded value expression are not evaluated with option -std=c++14
Date: Mon, 05 Mar 2018 14:28:00 -0000
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--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Mon Mar 5 14:28:15 2018
New Revision: 258246
URL: https://gcc.gnu.org/viewcvs?rev=258246&root=gcc&view=rev
Log:
PR c++/84686 - missing volatile loads.
* cvt.c (convert_to_void): Call maybe_undo_parenthesized_ref.
Added:
branches/gcc-6-branch/gcc/testsuite/g++.dg/tree-ssa/volatile2.C
Modified:
branches/gcc-6-branch/gcc/cp/ChangeLog
branches/gcc-6-branch/gcc/cp/cvt.c
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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84686] [6/7 Regression] Parenthesized discarded value expression are not evaluated with option -std=c++14
Date: Mon, 05 Mar 2018 14:28:00 -0000
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--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Mon Mar 5 14:28:07 2018
New Revision: 258245
URL: https://gcc.gnu.org/viewcvs?rev=258245&root=gcc&view=rev
Log:
PR c++/84686 - missing volatile loads.
* cvt.c (convert_to_void): Call maybe_undo_parenthesized_ref.
Added:
branches/gcc-7-branch/gcc/testsuite/g++.dg/tree-ssa/volatile2.C
Modified:
branches/gcc-7-branch/gcc/cp/ChangeLog
branches/gcc-7-branch/gcc/cp/cvt.c
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84684] inserting random code / flags produces wrong code
Date: Mon, 05 Mar 2018 14:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84684
--- Comment #11 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Seems like another of the wrong caching issues. I can't reproduce it on my
laptop though; can you figure out where the first call, the one which ends up
cached in the constexpr_call_table originates?
>From gcc-bugs-return-596197-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 14:41:35 2018
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From: "wilco at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84114] global reassociation pass prevents fma usage, generates slower code
Date: Mon, 05 Mar 2018 14:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84114
--- Comment #7 from Wilco <wilco at gcc dot gnu.org> ---
Author: wilco
Date: Mon Mar 5 14:40:55 2018
New Revision: 258248
URL: https://gcc.gnu.org/viewcvs?rev=258248&root=gcc&view=rev
Log:
[AArch64] PR84114: Avoid reassociating FMA
As discussed in the PR, the reassociation phase runs before FMAs are formed
and so can significantly reduce FMA opportunities. Although reassociation
could be switched off, it helps in many cases, so a better alternative is to
only avoid reassociation of floating point additions. This fixes the testcase
and gives 1% speedup on SPECFP2017, fixing the performance regression.
gcc/
PR tree-optimization/84114
* config/aarch64/aarch64.c (aarch64_reassociation_width)
Avoid reassociation of FLOAT_MODE addition.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/aarch64/aarch64.c
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From: "mario-baumann at web dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/84716] New: bootstrap fails on Darwin with internal compiler error: in compute_antic_aux, at tree-ssa-pre.c:2148
Date: Mon, 05 Mar 2018 14:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84716
Bug ID: 84716
Summary: bootstrap fails on Darwin with internal compiler
error: in compute_antic_aux, at tree-ssa-pre.c:2148
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: mario-baumann at web dot de
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Created attachment 43563
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43563&action=edit
delta reduction of isl_factorization.c
bootstrap fails on Darwin while compiling ISL file isl_factorization.c from
isl-0.16.1 during stage-2:
isl_factorization.c:44:17: internal compiler error: in compute_antic_aux, at
tree-ssa-pre.c:2148
isl_factorizer* isl_basic_set_factorizer(isl_basic_map* bset)
^~~~~~~~~~~~~~~~~~~~~~~~
> /Gcc/8.0.1/.bld/./prev-gcc/xgcc -v
Using built-in specs.
COLLECT_GCC=/Gcc/8.0.1/.bld/./prev-gcc/xgcc
Target: x86_64-apple-darwin17
Configured with: /Gcc/8.0.1/.src/configure --prefix=/Gcc/8.0.1
--build=x86_64-apple-darwin17 --enable-languages=c,c++,fortran --enable-lto
--enable-stage1-checking --enable-libstdcxx-time --disable-nls
--disable-libquadmath --disable-libquadmath-support --with-ld=/opt/local/bin/ld
--with-ar=/opt/local/bin/ar --with-as=/opt/local/bin/as --with-system-zlib
--with-pkgversion=svn-revision-258242
Thread model: posix
gcc version 8.0.1 20180305 (experimental) (svn-revision-258242)
Findings:
- Delta reduction for isl_factorization.c is attached
- Locally compiled with:
/Gcc/8.0.1/.bld/./prev-gcc/xgcc -B/Gcc/8.0.1/.bld/./prev-gcc/
-B/Gcc/8.0.1/x86_64-apple-darwin17/bin/ -B/Gcc/8.0.1/x86_64-apple-darwin17/bin/
-c -O2 isl_factorization.c
- Compilation with -O1 and -O0 works fine
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84708] [8 Regression] internal compiler error: in lambda_expr_this_capture, at cp/lambda.c:772
Date: Mon, 05 Mar 2018 14:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84708
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|ice-on-invalid-code |ice-on-valid-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-05
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |8.0
Summary|internal compiler error: in |[8 Regression] internal
|lambda_expr_this_capture, |compiler error: in
|at cp/lambda.c:772 |lambda_expr_this_capture,
| |at cp/lambda.c:772
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r251433. Previous revisions compile this fine, so should be
valid.
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Subject: [Bug c++/84684] inserting random code / flags produces wrong code
Date: Mon, 05 Mar 2018 14:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84684
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
CC| |jason at gcc dot gnu.org
Target Milestone|--- |8.0
--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
It seems to be a CONSTRUCTOR sharing issue somewhere.
If I put a breakpoint on cxx_eval_constant_expression when t is:
union_composition<0, dna4>::value_to_char_helper<4, dna4> (TARGET_EXPR
<D.34562, {}>)
and then add breakpoint on constexpr.c:1601, the first hit on that breakpoint
is that value_to_char_helper call (let's just ignore it) and following 3 calls
are
with t
to_char<dna4> (TARGET_EXPR <D.34725, *(const struct dna4 &) dna4::assign_rank
(&alphabet, (int) (uint8_t) i)>)
On the first of these 3 I see:
(gdb) p debug_generic_stmt (new_call.bindings)
alph {._value=0}
$217 = void
(gdb) p new_call.bindings->list.value
$218 = <constructor 0x7fffee727210>
and obviously nothing is found in the cache.
On the second call I see:
(gdb) p debug_generic_stmt (new_call.bindings)
alph {._value=1}
$219 = void
(gdb) p new_call.bindings->list.value
$220 = <constructor 0x7fffee7272b8>
(gdb) p debug_generic_stmt ($218)
{._value=1}
and the last case is already a problem, but we are lucky at this iteration, the
hashes are different and with luck we don't find the entry.
And in the third call I see:
(gdb) p debug_generic_stmt (new_call.bindings)
alph {._value=2}
$222 = void
(gdb) p new_call.bindings->list.value
$223 = <constructor 0x7fffee727378>
(gdb) p debug_generic_stmt ($218)
{._value=2}
$224 = void
(gdb) p debug_generic_stmt ($220)
{._value=2}
and this time we are unlucky and find the call from the previous iteration.
To get this problem far more unlikely, we could in constexpr_call_hasher::equal
add:
if (lhs == rhs)
return 1;
+ if (lhs->hash != rhs->hash)
+ return false;
if (!constexpr_fundef_hasher::equal (lhs->fundef, rhs->fundef))
return 0;
(this function is returning bool, so shouldn't return 0/1 instead of true/false
btw), which I think generally is a good thing for performance reasons.
But it will not really address the underlying bug. Either whatever modified
the $218 and $220 ctors shouldn't really modify them.
To reproduce this bug reliably, do:
--- gcc/cp/constexpr.c.jj 2018-03-05 13:58:05.475928800 +0100
+++ gcc/cp/constexpr.c 2018-03-05 15:54:06.529016570 +0100
@@ -1598,8 +1598,12 @@ cxx_eval_call_expression (const constexp
constexpr_call *entry = NULL;
if (depth_ok && !non_constant_args && ctx->strict)
{
+#if 0
new_call.hash = iterative_hash_template_arg
(new_call.bindings, constexpr_fundef_hasher::hash (new_call.fundef));
+#else
+ new_call.hash = 0;
+#endif
/* If we have seen this call before, we are done. */
maybe_initialize_constexpr_call_table ();
and then it reproduces even on the simplified:
typedef decltype (sizeof (0)) size_t;
namespace std {
template<class _E>
struct initializer_list
{
typedef _E value_type;
typedef const _E& reference;
typedef const _E& const_reference;
typedef size_t size_type;
typedef const _E* iterator;
typedef const _E* const_iterator;
iterator _M_array;
size_type _M_len;
constexpr initializer_list(const_iterator __a, size_type __l) :
_M_array(__a), _M_len(__l) { }
constexpr initializer_list() noexcept : _M_array(0), _M_len(0) { }
constexpr size_type size() const noexcept { return _M_len; }
constexpr const_iterator begin() const noexcept { return _M_array; }
constexpr const_iterator end() const noexcept { return begin() + size(); }
};
}
template <typename E, size_t N>
struct array
{
constexpr E &operator[](size_t n) noexcept { return elems[n]; }
constexpr const E &operator[](size_t n) const noexcept { return elems[n]; }
constexpr size_t size() const { return N; }
E elems[N];
};
template<typename T>
constexpr
inline T
max (std::initializer_list<T> i)
{
const T *b = i.begin ();
const T *e = i.end ();
if (b == e) return *b;
const T *r = b;
while (++b != e)
if (*r < *b)
r = b;
return *r;
}
template <typename alphabet_type>
constexpr char to_char(alphabet_type const alph)
{
return alph.to_char();
}
template <typename ...alphabet_types>
struct union_composition
{
static constexpr size_t value_size = (alphabet_types::value_size + ... );
unsigned char _value;
template <size_t fixed_size, typename alphabet_t>
static constexpr auto value_to_char_helper(alphabet_t alphabet)
{
array<char, fixed_size> value_to_char{};
for (size_t i = 0u; i < alphabet_t::value_size; ++i)
value_to_char[i] = to_char(alphabet.assign_rank(i));
return value_to_char;
}
static constexpr auto make_value_to_char()
{
constexpr auto N = sizeof...(alphabet_types);
constexpr array<size_t, N> alphabet_sizes { alphabet_types::value_size...
};
constexpr size_t fixed_size = max({alphabet_types::value_size...});
array value_to_char_tables = array<array<char, fixed_size>, N> {
value_to_char_helper<fixed_size>(alphabet_types{})...
};
array<char, value_size> value_to_char{};
for (size_t i = 0u, value = 0u; i < N; ++i)
for (size_t k = 0u; k < alphabet_sizes[i]; ++k, ++value)
value_to_char[value] = value_to_char_tables[i][k];
return value_to_char;
}
};
struct gap
{
constexpr char to_char() const noexcept { return '-'; }
constexpr gap & assign_rank([[maybe_unused]] bool const i) noexcept { return
*this; }
static constexpr size_t value_size{1};
};
struct dna4
{
constexpr char to_char() const noexcept { return value_to_char[_value]; }
constexpr dna4 & assign_rank(unsigned char const c) { _value = c; return
*this; }
static constexpr size_t value_size{4};
static constexpr char value_to_char[value_size] { 'A', 'C', 'G', 'T' };
unsigned char _value;
};
struct dna5
{
constexpr char to_char() const noexcept { return value_to_char[_value]; }
constexpr dna5 & assign_rank(unsigned char const c) { _value = c; return
*this; }
static constexpr size_t value_size{5};
static constexpr char value_to_char[value_size] { 'A', 'C', 'G', 'T', 'N' };
unsigned char _value;
};
constexpr array value_to_char1 = union_composition<dna4>::make_value_to_char();
static_assert(value_to_char1.size() == 4u);
static_assert(value_to_char1[0] == 'A');
static_assert(value_to_char1[1] == 'C');
static_assert(value_to_char1[2] == 'G');
static_assert(value_to_char1[3] == 'T');
constexpr array value_to_char2 = union_composition<dna4,
gap>::make_value_to_char();
static_assert(value_to_char2.size() == 5u);
static_assert(value_to_char2[0] == 'A');
static_assert(value_to_char2[1] == 'C');
static_assert(value_to_char2[2] == 'G');
static_assert(value_to_char2[3] == 'T');
static_assert(value_to_char2[4] == '-');
constexpr array value_to_char3 = union_composition<dna4, gap,
dna5>::make_value_to_char();
static_assert(value_to_char3.size() == 10u);
static_assert(value_to_char3[0] == 'A');
static_assert(value_to_char3[1] == 'C');
static_assert(value_to_char3[2] == 'G');
static_assert(value_to_char3[3] == 'T');
static_assert(value_to_char3[4] == '-');
static_assert(value_to_char3[5] == 'A');
static_assert(value_to_char3[6] == 'C');
static_assert(value_to_char3[7] == 'G');
static_assert(value_to_char3[8] == 'T');
static_assert(value_to_char3[9] == 'N');
constexpr array value_to_char4 = union_composition<dna5, gap,
dna4>::make_value_to_char();
static_assert(value_to_char4.size() == 10u);
static_assert(value_to_char4[0] == 'A');
static_assert(value_to_char4[1] == 'C');
static_assert(value_to_char4[2] == 'G');
static_assert(value_to_char4[3] == 'T');
static_assert(value_to_char4[4] == 'N');
static_assert(value_to_char4[5] == '-');
static_assert(value_to_char4[6] == 'A');
static_assert(value_to_char4[7] == 'C');
static_assert(value_to_char4[8] == 'G');
static_assert(value_to_char4[9] == 'T');
constexpr array value_to_char5 = union_composition<gap, dna4,
dna5>::make_value_to_char();
static_assert(value_to_char5.size() == 10u);
static_assert(value_to_char5[0] == '-');
static_assert(value_to_char5[1] == 'A');
static_assert(value_to_char5[2] == 'C');
static_assert(value_to_char5[3] == 'G');
static_assert(value_to_char5[4] == 'T');
static_assert(value_to_char5[5] == 'A');
static_assert(value_to_char5[6] == 'C');
static_assert(value_to_char5[7] == 'G');
static_assert(value_to_char5[8] == 'T');
static_assert(value_to_char5[9] == 'N');
With that hack I get:
pr84684-4.C:111:33: error: static assertion failed
static_assert(value_to_char1[1] == 'C');
pr84684-4.C:112:33: error: static assertion failed
static_assert(value_to_char1[2] == 'G');
pr84684-4.C:113:33: error: static assertion failed
static_assert(value_to_char1[3] == 'T');
pr84684-4.C:118:33: error: static assertion failed
static_assert(value_to_char2[1] == 'C');
pr84684-4.C:119:33: error: static assertion failed
static_assert(value_to_char2[2] == 'G');
pr84684-4.C:120:33: error: static assertion failed
static_assert(value_to_char2[3] == 'T');
pr84684-4.C:126:33: error: static assertion failed
static_assert(value_to_char3[1] == 'C');
pr84684-4.C:127:33: error: static assertion failed
static_assert(value_to_char3[2] == 'G');
pr84684-4.C:128:33: error: static assertion failed
static_assert(value_to_char3[3] == 'T');
pr84684-4.C:131:33: error: static assertion failed
static_assert(value_to_char3[6] == 'C');
pr84684-4.C:132:33: error: static assertion failed
static_assert(value_to_char3[7] == 'G');
pr84684-4.C:133:33: error: static assertion failed
static_assert(value_to_char3[8] == 'T');
pr84684-4.C:134:33: error: static assertion failed
static_assert(value_to_char3[9] == 'N');
pr84684-4.C:139:33: error: static assertion failed
static_assert(value_to_char4[1] == 'C');
pr84684-4.C:140:33: error: static assertion failed
static_assert(value_to_char4[2] == 'G');
pr84684-4.C:141:33: error: static assertion failed
static_assert(value_to_char4[3] == 'T');
pr84684-4.C:142:33: error: static assertion failed
static_assert(value_to_char4[4] == 'N');
pr84684-4.C:145:33: error: static assertion failed
static_assert(value_to_char4[7] == 'C');
pr84684-4.C:146:33: error: static assertion failed
static_assert(value_to_char4[8] == 'G');
pr84684-4.C:147:33: error: static assertion failed
static_assert(value_to_char4[9] == 'T');
pr84684-4.C:153:33: error: static assertion failed
static_assert(value_to_char5[2] == 'C');
pr84684-4.C:154:33: error: static assertion failed
static_assert(value_to_char5[3] == 'G');
pr84684-4.C:155:33: error: static assertion failed
static_assert(value_to_char5[4] == 'T');
pr84684-4.C:157:33: error: static assertion failed
static_assert(value_to_char5[6] == 'C');
pr84684-4.C:158:33: error: static assertion failed
static_assert(value_to_char5[7] == 'G');
pr84684-4.C:159:33: error: static assertion failed
static_assert(value_to_char5[8] == 'T');
pr84684-4.C:160:33: error: static assertion failed
static_assert(value_to_char5[9] == 'N');
>From gcc-bugs-return-596201-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 15:01:36 2018
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Subject: [Bug tree-optimization/84486] [7/8 Regression] code hoisting removes alignment assumption
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84486
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Mar 5 15:00:48 2018
New Revision: 258249
URL: https://gcc.gnu.org/viewcvs?rev=258249&root=gcc&view=rev
Log:
2018-03-05 Richard Biener <rguenther@suse.de>
PR tree-optimization/84486
* tree-ssa-pre.c (create_expression_by_pieces): Remove dead code.
When inserting a __builtin_assume_aligned call set the LHS
SSA name alignment info accordingly.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/tree-ssa-pre.c
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84486] [7 Regression] code hoisting removes alignment assumption
Date: Mon, 05 Mar 2018 15:01:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |8.0
Summary|[7/8 Regression] code |[7 Regression] code
|hoisting removes alignment |hoisting removes alignment
|assumption |assumption
Known to fail| |7.3.0
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk sofar. Will backport with next batch.
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Subject: [Bug bootstrap/84716] bootstrap fails on Darwin with internal compiler error: in compute_antic_aux, at tree-ssa-pre.c:2148
Date: Mon, 05 Mar 2018 15:03:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Dup.
*** This bug has been marked as a duplicate of bug 84670 ***
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Subject: [Bug tree-optimization/84670] [8 Regression] ICE: in compute_antic_aux, at tree-ssa-pre.c:2148 with -O2 -fno-tree-dominator-opts
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mario-baumann at web dot de
--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 84716 has been marked as a duplicate of this bug. ***
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Subject: [Bug other/84715] "./configure --disable-multilib && make" fails due to "g++: error: gengtype-lex.c: No such file or directory"
Date: Mon, 05 Mar 2018 15:04:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
As documented.
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Subject: [Bug c/84717] New: C compiler accepts fortran style suffix "d" with float number but result is strange
Date: Mon, 05 Mar 2018 15:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84717
Bug ID: 84717
Summary: C compiler accepts fortran style suffix "d" with float
number but result is strange
Product: gcc
Version: 6.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: stiefschmied at alice dot de
Target Milestone: ---
Target: x86_64-apple-darwin (and others?)
Created attachment 43564
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43564&action=edit
example c code which compiles with gcc 6.4.0 but should give an error.
When porting code from Fortran, a floating point number was accidentially
written like this:
static double aem = 7.29735d-3;
gcc version 6.4.0 accepts the code, but assigns an unexpected result:
static double aem = 7.29735-3;
Other compilers (tested with: clang 9.0.0 or gcc version 4.4.7) report an error
during compilation:
error: invalid suffix "d" on floating constant
I think this is a compiler bug? The example code is attached.
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Subject: [Bug c++/84684] inserting random code / flags produces wrong code
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--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
If the in-place modification of the CONSTRUCTOR in these cases are intentional,
the fix could be:
if (entry == NULL)
{
/* We need to keep a pointer to the entry, not just the slot, as the
slot can move in the call to cxx_eval_builtin_function_call. */
*slot = entry = ggc_alloc<constexpr_call> ();
*entry = new_call;
+ entry->bindings = unshare_constructor (entry->bindings);
}
with or without the if (lhs->hash != rhs->hash) return false; performance
improvement.
But I really don't have an idea about whether the sharing is intentional or
not, or how much compile time memory increase would the above cause.
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Subject: [Bug c/84717] C compiler accepts fortran style suffix "d" with float number but result is strange
Date: Mon, 05 Mar 2018 15:15:00 -0000
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to stiefschmied from comment #0)
> I think this is a compiler bug? The example code is attached.
No. Compile with -Wpedantic and you see why it's accepted:
84717.c:3:21: warning: suffix for double constant is a GCC extension
static double aem = 7.29735d-3;
^~~~~~~~
84717.c:6:1: error: unknown type name ‘Int’; did you mean ‘int’?
Int main() {
^~~
int
Or use -Wpedantic-errors to reject it.
I think the suffix is to distinguish 1.0d from 1.0f or 1.0l but I can't find
any documentation on it.
>From gcc-bugs-return-596209-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 15:22:49 2018
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Subject: [Bug c++/84714] internal compiler error: in create_tmp_var, at gimple-expr.c:476
Date: Mon, 05 Mar 2018 15:22:00 -0000
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-05
CC| |dmalcolm at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Assertion failure here:
#1 0x0000000000cc4a0b in create_tmp_var (type=type@entry=<record_type
0x7ffff1a079d8 b>, prefix=<optimized out>)
at ../../src/gcc/gimple-expr.c:476
476 gcc_assert (!TREE_ADDRESSABLE (type) && COMPLETE_TYPE_P (type));
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Subject: [Bug middle-end/21161] [6/7/8 Regression] "clobbered by longjmp" warning ignores the data flow
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--- Comment #15 from Bruno Haible <bruno at clisp dot org> ---
> I think the following test case does show what Bruno was trying to prove.
Yes, the test case from comment 14 much better reflects what this bug report is
about, than the one from comment 13.
>From gcc-bugs-return-596211-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 15:26:27 2018
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Subject: [Bug c/84717] suffix for double constant is a GCC extension is not documented
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |documentation
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-05
Summary|C compiler accepts fortran |suffix for double constant
|style suffix "d" with float |is a GCC extension is not
|number but result is |documented
|strange |
Ever confirmed|0 |1
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Extension but not documented as far as I can see.
>From gcc-bugs-return-596212-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 15:29:39 2018
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Subject: [Bug rtl-optimization/84713] ANY_RETURN_P does't check all SIMPLE_RETURNs
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
ANY_RETURN_P is correct. What might not be correct is the usage of
ANY_RETURN_P. But there is not enough context here to see that.
>From gcc-bugs-return-596213-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 15:40:51 2018
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Subject: [Bug c++/84618] [8 Regression] ICE in build_capture_proxy, at cp/lambda.c:460
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--- Comment #4 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Mon Mar 5 15:40:15 2018
New Revision: 258250
URL: https://gcc.gnu.org/viewcvs?rev=258250&root=gcc&view=rev
Log:
/cp
2018-03-05 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84618
* parser.c (cp_parser_lambda_introducer): Reject any capture not
involving a VAR_DECL or a PARM_DECL.
/testsuite
2018-03-05 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84618
* g++.dg/cpp0x/lambda/lambda-ice29.C: New.
* g++.dg/cpp0x/lambda/lambda-ice17.C: Adjust.
* g++.dg/cpp0x/lambda/lambda-ice23.C: Likewise.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-ice29.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/parser.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-ice17.C
trunk/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-ice23.C
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Subject: [Bug c++/54367] [meta-bug] lambda expressions
Date: Mon, 05 Mar 2018 15:41:00 -0000
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Bug 54367 depends on bug 84618, which changed state.
Bug 84618 Summary: [8 Regression] ICE in build_capture_proxy, at cp/lambda.c:460
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84618
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
>From gcc-bugs-return-596214-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 15:41:43 2018
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Subject: [Bug c++/84618] [8 Regression] ICE in build_capture_proxy, at cp/lambda.c:460
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Blocks| |54367
Resolution|--- |FIXED
Assignee|paolo.carlini at oracle dot com |unassigned at gcc dot gnu.org
--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54367
[Bug 54367] [meta-bug] lambda expressions
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Subject: [Bug c++/84709] Cannot define method with same name of previously using declared class
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--- Comment #2 from Jose Dapena Paz <jose.dapena at lge dot com> ---
OK, just for understanding all the edges of this...
So the fact that in namespace B A::Foo the full A::Foo name is still accessible
is not relevant right?
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Subject: [Bug c++/84686] [6/7 Regression] Parenthesized discarded value expression are not evaluated with option -std=c++14
Date: Mon, 05 Mar 2018 15:49:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug target/84264] [8 Regression] ICE in rs6000_emit_le_vsx_store, at config/rs6000/rs6000.c:10367 starting with r256656
Date: Mon, 05 Mar 2018 15:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84264
--- Comment #7 from Peter Bergner <bergner at gcc dot gnu.org> ---
Author: bergner
Date: Mon Mar 5 15:52:11 2018
New Revision: 258251
URL: https://gcc.gnu.org/viewcvs?rev=258251&root=gcc&view=rev
Log:
gcc/
PR target/84264
* config/rs6000/vector.md (mov<mode>): Disallow altivec memory
operands.
gcc/testsuite/
PR target/84264
* g++.dg/pr84264.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/pr84264.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/rs6000/vector.md
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug tree-optimization/84687] [8 Regression] error: invalid conversion in gimple call with -O3 and -ffast-math
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43565
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43565&action=edit
gcc8-pr84687.patch
Untested fix.
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Subject: [Bug target/84524] -O3 causes behavior change
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Mar 5 16:01:03 2018
New Revision: 258252
URL: https://gcc.gnu.org/viewcvs?rev=258252&root=gcc&view=rev
Log:
PR target/84524
* config/i386/sse.md (*<code><mode>3): Replace <mask_prefix3> with
orig,vex.
(*<plusminus_insn><mode>3): Likewise. Remove <mask_operand3> uses.
* gcc.c-torture/execute/pr84524.c: New test.
* gcc.target/i386/avx512bw-pr84524.c: New test.
Added:
trunk/gcc/testsuite/gcc.c-torture/execute/pr84524.c
trunk/gcc/testsuite/gcc.target/i386/avx512bw-pr84524.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/sse.md
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug middle-end/84718] New: [8 regression] ICE when compiling chromium
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84718
Bug ID: 84718
Summary: [8 regression] ICE when compiling chromium
Product: gcc
Version: unknown
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Created attachment 43566
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gcc log
Using latest gcc 8 updated today I hit an internal compiler error in the
Chromium part of qtwebengine in the file
net/spdy/core/spdy_alt_svc_wire_format.cc
>From gcc-bugs-return-596221-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 16:02:39 2018
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Subject: [Bug c++/84684] inserting random code / flags produces wrong code
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org
--- Comment #14 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Let me see if I can figure it out.
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Subject: [Bug middle-end/84718] [8 regression] ICE when compiling chromium
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--- Comment #1 from Allan Jensen <linux at carewolf dot com> ---
Created attachment 43567
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43567&action=edit
spdy_alt_svc_wire_format.s
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Subject: [Bug middle-end/84718] [8 regression] ICE when compiling chromium
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Dup of bug 84670?
>From gcc-bugs-return-596224-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 16:05:20 2018
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Subject: [Bug middle-end/84718] [8 regression] ICE when compiling chromium
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--- Comment #2 from Allan Jensen <linux at carewolf dot com> ---
Created attachment 43568
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spdy_alt_svc_wire_format.ii.gz
>From gcc-bugs-return-596226-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 16:07:19 2018
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From: "linux at carewolf dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/84718] [8 regression] ICE when compiling chromium
Date: Mon, 05 Mar 2018 16:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84718
--- Comment #4 from Allan Jensen <linux at carewolf dot com> ---
I will update my gcc build and check
>From gcc-bugs-return-596227-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 16:10:26 2018
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/84524] -O3 causes behavior change
Date: Mon, 05 Mar 2018 16:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84524
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Mar 5 16:09:49 2018
New Revision: 258253
URL: https://gcc.gnu.org/viewcvs?rev=258253&root=gcc&view=rev
Log:
PR target/84524
* config/i386/sse.md (*<code><mode>3): Replace <mask_prefix3> with
orig,vex.
(*<plusminus_insn><mode>3): Likewise. Remove <mask_operand3> uses.
* gcc.c-torture/execute/pr84524.c: New test.
* gcc.target/i386/avx512bw-pr84524.c: New test.
Added:
branches/gcc-7-branch/gcc/testsuite/gcc.c-torture/execute/pr84524.c
branches/gcc-7-branch/gcc/testsuite/gcc.target/i386/avx512bw-pr84524.c
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/config/i386/sse.md
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug target/84524] -O3 causes behavior change
Date: Mon, 05 Mar 2018 16:11:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84524
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed for 7.4+.
>From gcc-bugs-return-596231-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 16:12:55 2018
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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/83983] FAIL: g++.dg/lto/pr83121 (test for LTO warnings, pr83121_0.C line 8)
Date: Mon, 05 Mar 2018 16:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83983
--- Comment #9 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
David, any idea about how to handle this? Otherwise I'm afraid that the new
LTO warning framework looks rather counter-productive if it makes it easier to
write tests that fail on half of the platforms...
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From: "nathan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/84694] [8 Regression] internal compiler error: tree check: expected tree that contains 'decl minimal' structure, have 'identifier_node' in do_friend, at cp/friend.c:498
Date: Mon, 05 Mar 2018 16:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84694
Nathan Sidwell <nathan at gcc dot gnu.org> changed:
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--- Comment #4 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Fixed r258254.
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Subject: [Bug c++/84694] [8 Regression] internal compiler error: tree check: expected tree that contains 'decl minimal' structure, have 'identifier_node' in do_friend, at cp/friend.c:498
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84694
--- Comment #5 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Author: nathan
Date: Mon Mar 5 16:12:07 2018
New Revision: 258254
URL: https://gcc.gnu.org/viewcvs?rev=258254&root=gcc&view=rev
Log:
[PR c++/84694] ICE on template friend decl
https://gcc.gnu.org/ml/gcc-patches/2018-03/msg00221.html
PR c++/84694
* friend.c (do_friend): Restore check for identifier_p inside
TEMPLATE_ID_EXPR.
PR c++/84694
* g++.dg/template/pr84694.C: New.
Added:
trunk/gcc/testsuite/g++.dg/template/pr84694.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/friend.c
trunk/gcc/testsuite/ChangeLog
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84707] [8 Regression] internal compiler error: Segmentation fault (tree_check()/duplicate_decls())
Date: Mon, 05 Mar 2018 16:16:00 -0000
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--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Mon Mar 5 16:15:35 2018
New Revision: 258255
URL: https://gcc.gnu.org/viewcvs?rev=258255&root=gcc&view=rev
Log:
PR c++/84707
* decl.c (duplicate_decls): Check DECL_NAME before accessing
UDLIT_OPER_P.
* g++.dg/cpp0x/inline-ns10.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/inline-ns10.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/decl.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/84707] [8 Regression] internal compiler error: Segmentation fault (tree_check()/duplicate_decls())
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug target/84564] error: unable to find a register to spill with -mforce-indirect-call
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84564
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Mar 5 16:24:43 2018
New Revision: 258256
URL: https://gcc.gnu.org/viewcvs?rev=258256&root=gcc&view=rev
Log:
PR target/84564
* config/i386/i386.c (ix86_function_ok_for_sibcall): Check for
regparm >= 3 with no arg reg available also for calls with
flag_force_indirect_call. Pass decl to ix86_function_regparm.
* gcc.target/i386/pr84564.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/pr84564.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/84564] error: unable to find a register to spill with -mforce-indirect-call
Date: Mon, 05 Mar 2018 16:26:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-596236-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 16:38:23 2018
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/71832] [7/8 Regression] ICE on invalid C++11 code with incorrect decltype use for non-type template parameter: Segmentation fault
Date: Mon, 05 Mar 2018 16:38:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |paolo.carlini at oracle dot com
--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Avoiding the ICE seems easy, something like the below but the diagnostic we
produce is way too redundant. I believe that in such cases we should skip
completely the body of the template (A).
Index: class.c
===================================================================
--- class.c (revision 258250)
+++ class.c (working copy)
@@ -7568,6 +7568,9 @@ push_nested_class (tree type)
void
pop_nested_class (void)
{
+ if (!current_class_type)
+ return;
+
tree context = DECL_CONTEXT (TYPE_MAIN_DECL (current_class_type));
popclass ();
>From gcc-bugs-return-596237-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 16:39:47 2018
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From: "gpnuma at centaurean dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/84719] New: gcc's __builtin_memcpy performance with certain number of bytes is terrible compared to clang's
Date: Mon, 05 Mar 2018 16:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84719
Bug ID: 84719
Summary: gcc's __builtin_memcpy performance with certain number
of bytes is terrible compared to clang's
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: gpnuma at centaurean dot com
Target Milestone: ---
I post this bug report as an echo to my post here :
https://stackoverflow.com/questions/49098453/
To reproduce : just create a file (test.c), compile (gcc -O3 test.c) and run
(time ./a.out) this simple code :
#include <sys/stat.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
int main(int argc, char *argv[]) {
const uint64_t size = 1000000000;
const size_t alloc_mem = size * sizeof(uint8_t);
uint8_t *mem = (uint8_t*)malloc(alloc_mem);
for (uint_fast64_t i = 0; i < size; i++)
mem[i] = (uint8_t) (i >> 7);
uint8_t block = 0;
uint_fast64_t counter = 0;
uint64_t total = 0x123456789abcdefllu;
uint64_t receiver = 0;
for(block = 1; block <= 8; block ++) {
printf("%u ...\n", block);
counter = 0;
while (counter < size - 8) {
__builtin_memcpy(&receiver, &mem[counter], block);
receiver &= (0xffffffffffffffffllu >> (64 - ((block) << 3)));
total += ((receiver * 0x321654987cbafedllu) >> 48);
counter += block;
}
}
printf("=> %llu\n", total);
return EXIT_SUCCESS;
}
Timings for gcc compiled code are almost 3x slower than those for clang. As a
side note, loop unrolling is not very well handled there as specifying a forced
unroll in gcc 8 improves performance, but this is not any better with clang.
Even with complete manual unrolling, the resulting gcc compiled code is still
3x slower than clangs's. After further testing it appears that the problem is
caused by some specific number of bytes requested in __builtin_memcpy, in
particular the __builtin_memcpy(,,3) performance is very poor.
My platform compiler infos :
gcc-7 -v
Using built-in specs.
COLLECT_GCC=gcc-7
COLLECT_LTO_WRAPPER=/usr/local/Cellar/gcc/7.3.0/libexec/gcc/x86_64-apple-darwin17.4.0/7.3.0/lto-wrapper
Target: x86_64-apple-darwin17.4.0
Configured with: ../configure --build=x86_64-apple-darwin17.4.0
--prefix=/usr/local/Cellar/gcc/7.3.0
--libdir=/usr/local/Cellar/gcc/7.3.0/lib/gcc/7
--enable-languages=c,c++,objc,obj-c++,fortran --program-suffix=-7
--with-gmp=/usr/local/opt/gmp --with-mpfr=/usr/local/opt/mpfr
--with-mpc=/usr/local/opt/libmpc --with-isl=/usr/local/opt/isl
--with-system-zlib --enable-checking=release --with-pkgversion='Homebrew GCC
7.3.0' --with-bugurl=https://github.com/Homebrew/homebrew-core/issues
--disable-nls
Thread model: posix
gcc version 7.3.0 (Homebrew GCC 7.3.0)
cc -v
Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin17.4.0
Thread model: posix
InstalledDir:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bi
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84719] gcc's __builtin_memcpy performance with certain number of bytes is terrible compared to clang's
Date: Mon, 05 Mar 2018 16:41:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-03-05
Ever confirmed|0 |1
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Does -mcpu=native improve it?
Also is GCC calling memcpy instead of doing an inline version?
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Subject: [Bug c++/84720] New: internal compiler error: tree check: expected tree that contains 'decl minimal' structure, have 'error_mark' in decl_anon_ns_mem_p, at cp/tree.c:3472
Date: Mon, 05 Mar 2018 16:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84720
Bug ID: 84720
Summary: internal compiler error: tree check: expected tree
that contains 'decl minimal' structure, have
'error_mark' in decl_anon_ns_mem_p, at cp/tree.c:3472
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Assignee: unassigned at gcc dot gnu.org
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CC: webrown.cpp at gmail dot com
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Input:
template<int &&>
struct a {
template<typename...>
static void b() {
b();
}
};
Output:
$ xgcc -x c++ -S -
<stdin>: In substitution of 'template<int&& <anonymous> > template<class ...>
static void a<<anonymous> >::b() [with <template-parameter-2-1> = <missing>;
int&& <anonymous> = {}]':
<stdin>:5:7: required from here
<stdin>:4:15: internal compiler error: tree check: expected tree that contains
'decl minimal' structure, have 'error_mark' in decl_anon_ns_mem_p, at
cp/tree.c:3472
0x66106d tree_contains_struct_check_failed(tree_node const*,
tree_node_structure_enum, char const*, int, char const*)
/home/vegard/git/gcc/gcc/tree.c:9509
0x131d185 contains_struct_check(tree_node const*, tree_node_structure_enum,
char const*, int, char const*)
/home/vegard/git/gcc/gcc/tree.h:3502
0x131d185 decl_anon_ns_mem_p(tree_node const*)
/home/vegard/git/gcc/gcc/cp/tree.c:3472
0xc3288f determine_visibility(tree_node*)
/home/vegard/git/gcc/gcc/cp/decl2.c:2537
0x117fa53 tsubst_function_decl
/home/vegard/git/gcc/gcc/cp/pt.c:12692
0x1156895 tsubst_decl
/home/vegard/git/gcc/gcc/cp/pt.c:12921
0x11071d6 tsubst(tree_node*, tree_node*, int, tree_node*)
/home/vegard/git/gcc/gcc/cp/pt.c:13809
0x1121474 instantiate_template_1
/home/vegard/git/gcc/gcc/cp/pt.c:18784
0x112423e instantiate_template(tree_node*, tree_node*, int)
/home/vegard/git/gcc/gcc/cp/pt.c:18840
0x119d32b fn_type_unification(tree_node*, tree_node*, tree_node*, tree_node*
const*, unsigned int, tree_node*, unification_kind_t, int, bool, bool)
/home/vegard/git/gcc/gcc/cp/pt.c:19220
0x907d89 add_template_candidate_real
/home/vegard/git/gcc/gcc/cp/call.c:3180
0x90af6c add_template_candidate
/home/vegard/git/gcc/gcc/cp/call.c:3258
0x90af6c add_candidates
/home/vegard/git/gcc/gcc/cp/call.c:5525
0x93bdea build_new_method_call_1
/home/vegard/git/gcc/gcc/cp/call.c:9154
0x93bdea build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, tree_node*, int, tree_node**, int)
/home/vegard/git/gcc/gcc/cp/call.c:9361
0x12802c0 finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**,
bool, bool, int)
/home/vegard/git/gcc/gcc/cp/semantics.c:2450
0xf7bb98 cp_parser_postfix_expression
/home/vegard/git/gcc/gcc/cp/parser.c:7244
0xf2e927 cp_parser_unary_expression
/home/vegard/git/gcc/gcc/cp/parser.c:8320
0xec435a cp_parser_cast_expression
/home/vegard/git/gcc/gcc/cp/parser.c:9088
0xec6986 cp_parser_binary_expression
/home/vegard/git/gcc/gcc/cp/parser.c:9189
$ xgcc --version
xgcc (GCC) 8.0.1 20180303 (experimental)
Built from git 0d86c284d085d29782d862600a79aa1ff0ee0c47 (r258221).
Seems to have been introduced between 6.3.0 and 7.1.0 (as it actually compiles
with 6.3.0). It also seems to compile with clang.
ICE message looks similar to bug #84694 but I have it on good authority that
it's a different bug :-)
Test case was minimised by C-Reduce.
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug inline-asm/84683] [6/7/8 Regression] internal compiler error: in move_for_stack_reg, at reg-stack.c:1173
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43569
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43569&action=edit
gcc8-pr84683.patch
Untested fix.
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From: "gpnuma at centaurean dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/84719] gcc's __builtin_memcpy performance with certain number of bytes is terrible compared to clang's
Date: Mon, 05 Mar 2018 16:53:00 -0000
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--- Comment #2 from gpnuma at centaurean dot com ---
(In reply to Andrew Pinski from comment #1)
> Does -mcpu=native improve it?
> Also is GCC calling memcpy instead of doing an inline version?
No -march=native does not make any difference.
And no, gcc is not calling memcpy as when I replace __builtin_memcpy by memcpy
in the above code it is somewhat slower, but the timing is the same as
clang/memcpy this time. It's just when comparing gcc/__builtin_memcpy and
clang/__builtin_memcpy that the resulting code exhibits considerable
performance differences in favor of clang.
>From gcc-bugs-return-596242-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 17:05:05 2018
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/84700] [6/7/8 Regression] ICE on 32-bit BE powerpc targets w/ -misel -O1
Date: Mon, 05 Mar 2018 17:05:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-05
CC| |jakub at gcc dot gnu.org
Target Milestone|--- |6.5
Summary|ICE on 32-bit BE powerpc |[6/7/8 Regression] ICE on
|targets w/ -misel -O1 |32-bit BE powerpc targets
| |w/ -misel -O1
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r218595. Seems endless recursion in the combiner.
>From gcc-bugs-return-596244-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 17:09:31 2018
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Subject: [Bug tree-optimization/84670] [8 Regression] ICE: in compute_antic_aux, at tree-ssa-pre.c:2148 with -O2 -fno-tree-dominator-opts
Date: Mon, 05 Mar 2018 17:09:00 -0000
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Allan Jensen <linux at carewolf dot com> changed:
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----------------------------------------------------------------------------
CC| |linux at carewolf dot com
--- Comment #13 from Allan Jensen <linux at carewolf dot com> ---
*** Bug 84718 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-596243-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 17:09:30 2018
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Subject: [Bug middle-end/84718] [8 regression] ICE when compiling chromium
Date: Mon, 05 Mar 2018 17:09:00 -0000
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Allan Jensen <linux at carewolf dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #5 from Allan Jensen <linux at carewolf dot com> ---
Yes an updated build which includes the fix from 84670 works.
*** This bug has been marked as a duplicate of bug 84670 ***
>From gcc-bugs-return-596245-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 17:11:53 2018
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Subject: [Bug target/84371] test case gcc.target/powerpc/builtins-3.c fails on power9
Date: Mon, 05 Mar 2018 17:11:00 -0000
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--- Comment #6 from Will Schmidt <willschm at gcc dot gnu.org> ---
Author: willschm
Date: Mon Mar 5 17:11:16 2018
New Revision: 258257
URL: https://gcc.gnu.org/viewcvs?rev=258257&root=gcc&view=rev
Log:
2018-03-05 Will Schmidt <will_schmidt@vnet.ibm.com>
Backport from trunk.
2018-02-16 Will Schmidt <will_schmidt@vnet.ibm.com>
PR target/84371
* gcc.target/powerpc/builtins-3.c: Update dg-options and dg-skip-if
stanzas.
* gcc.target/powerpc/builtins-3.p8.c: Add dg-skip-if stanza.
* gcc.target/powerpc/builtins-3.p9.c: Add dg-skip-if stanza.
Modified:
branches/gcc-7-branch/gcc/testsuite/ChangeLog
branches/gcc-7-branch/gcc/testsuite/gcc.target/powerpc/builtins-3-p8.c
branches/gcc-7-branch/gcc/testsuite/gcc.target/powerpc/builtins-3-p9.c
branches/gcc-7-branch/gcc/testsuite/gcc.target/powerpc/builtins-3.c
>From gcc-bugs-return-596246-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 17:13:05 2018
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Subject: [Bug target/84711] AArch32 big-endian fails when taking subreg of a vector mode to a scalar mode.
Date: Mon, 05 Mar 2018 17:13:00 -0000
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Tamar Christina <tnfchris at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #2 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
I have submitted this for GCC 8 after all.
>From gcc-bugs-return-596247-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 17:27:02 2018
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/84684] inserting random code / flags produces wrong code
Date: Mon, 05 Mar 2018 17:27:00 -0000
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--- Comment #15 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I think this is the fix:
--- a/gcc/cp/typeck2.c
+++ b/gcc/cp/typeck2.c
@@ -1251,8 +1251,7 @@ massage_init_elt (tree type, tree init, int nested,
tsubst_flags_t complain)
init = TARGET_EXPR_INITIAL (init);
/* When we defer constant folding within a statement, we may want to
defer this folding as well. */
- tree t = fold_non_dependent_expr (init);
- t = maybe_constant_init (t);
+ tree t = fold_non_dependent_init (init);
if (TREE_CONSTANT (t))
init = t;
return init;
(implementation of fold_non_dependent_init intentionally omitted here).
>From gcc-bugs-return-596248-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 17:36:25 2018
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Subject: [Bug target/84719] gcc's __builtin_memcpy performance with certain number of bytes is terrible compared to clang's
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|x86_64-apple-darwin17.4.0 |x86_64
CC| |hjl.tools at gmail dot com
--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
Confirmed on Linux/x86-64.
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Subject: [Bug target/84700] [6/7/8 Regression] ICE on 32-bit BE powerpc targets w/ -misel -O1
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |segher at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Seems it is combine_simplify_rtx called with x:
(plus:SI (ltu:SI (plus:SI (if_then_else:SI (eq (reg:CC 147)
(const_int 0 [0]))
(subreg:SI (reg:DI 126) 4)
(reg:SI 146))
(subreg:SI (reg:DI 126) 4))
(if_then_else:SI (eq (reg:CC 147)
(const_int 0 [0]))
(subreg:SI (reg:DI 126) 4)
(reg:SI 146)))
(reg:SI 133 [ iftmp.0_2 ]))
and from == to == pc_rtx.
>From gcc-bugs-return-596250-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 17:44:42 2018
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Subject: [Bug target/84700] [6/7/8 Regression] ICE on 32-bit BE powerpc targets w/ -misel -O1
Date: Mon, 05 Mar 2018 17:44:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43570
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43570&action=edit
gcc8-pr84700.patch
Untested fix.
>From gcc-bugs-return-596251-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 17:45:48 2018
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Subject: [Bug target/84719] gcc's __builtin_memcpy performance with certain number of bytes is terrible compared to clang's
Date: Mon, 05 Mar 2018 17:45:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |NEW
--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
I compared __builtin_memcpy one size at a time. Here are results in
cycles:
clang 1 bytes: 17193410146
gcc 1 bytes: 15440244966
clang 2 bytes: 8997535880
gcc 2 bytes: 8147449530
clang 3 bytes: 6002276628
gcc 3 bytes: 5430387704
clang 4 bytes: 4497121282
gcc 4 bytes: 4069604454
clang 5 bytes: 3644879742
gcc 5 bytes: 3258094970
clang 6 bytes: 3045612708
gcc 6 bytes: 2728410608
clang 7 bytes: 2574110178
gcc 7 bytes: 2330365680
clang 8 bytes: 969894432
gcc 8 bytes: 6436950208
GCC is faster except for 8 byte size.
>From gcc-bugs-return-596252-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 17:56:30 2018
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Subject: [Bug lto/84592] [openacc,openmp] lto1: ICE in input_varpool_node, at lto-cgraph.c:1424: for CSWTCH symbol
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--- Comment #7 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 43571
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43571&action=edit
Tentative patch
Works on nvptx for the examples from comment 0, comment 3 and comment 5.
>From gcc-bugs-return-596253-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 18:07:47 2018
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Subject: [Bug c/84721] New: [8 Regression] ICE in c_push_function_context, at c-decl.c:9667
Date: Mon, 05 Mar 2018 18:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84721
Bug ID: 84721
Summary: [8 Regression] ICE in c_push_function_context, at
c-decl.c:9667
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
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Changed between 20171210 and 20171217 (ICE at -O[gs123]) :
$ cat z1.c
int a[({ int b })];
$ cat z3.c
int a[({ int f() {}; })];
$ gcc-8-20171210 -g -O2 -c z1.c
z1.c:1:7: error: braced-group within expression allowed only inside a function
int a[({ int b })];
^
$ gcc-8-20180304 -g -O2 -c z1.c
z1.c:1:1: internal compiler error: Segmentation fault
int a[({ int b })];
^~~
0xaed10f crash_signal
../../gcc/toplev.c:325
0x6761df c_push_function_context()
../../gcc/c/c-decl.c:9667
0x6b3ef5 c_parser_declaration_or_fndef
../../gcc/c/c-parser.c:2242
0x6b2292 c_parser_compound_statement_nostart
../../gcc/c/c-parser.c:5001
0x6999a8 c_parser_postfix_expression
../../gcc/c/c-parser.c:7943
0x6a2682 c_parser_unary_expression
../../gcc/c/c-parser.c:7262
0x6a3437 c_parser_cast_expression
../../gcc/c/c-parser.c:7103
0x6a3703 c_parser_binary_expression
../../gcc/c/c-parser.c:6906
0x6a4745 c_parser_conditional_expression
../../gcc/c/c-parser.c:6644
0x6a4cd0 c_parser_expr_no_commas
../../gcc/c/c-parser.c:6561
0x6b142a c_parser_direct_declarator_inner
../../gcc/c/c-parser.c:3815
0x6b305f c_parser_declaration_or_fndef
../../gcc/c/c-parser.c:1989
0x6b9be3 c_parser_external_declaration
../../gcc/c/c-parser.c:1644
0x6ba659 c_parser_translation_unit
../../gcc/c/c-parser.c:1524
0x6ba659 c_parse_file()
../../gcc/c/c-parser.c:18410
0x6fd2d5 c_common_parse_file()
../../gcc/c-family/c-opts.c:1132
>From gcc-bugs-return-596254-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 18:11:00 2018
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Subject: [Bug c/84722] New: [8 Regression] ICE in create_dispatcher_calls, at multiple_target.c:147
Date: Mon, 05 Mar 2018 18:11:00 -0000
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Bug ID: 84722
Summary: [8 Regression] ICE in create_dispatcher_calls, at
multiple_target.c:147
Product: gcc
Version: 8.0
Status: UNCONFIRMED
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Changed between 20170618 and 20170716 (on x86_64/linux) :
$ cat z1.c
__attribute__((target_clones("avx","arch=core-avx2","default")))
int foo (int i)
{
return i+1;
}
int weaks (int i) __attribute__((weak, alias("foo")));
$ gcc-8-20170618 -c z1.c
$
$ gcc-8-20180304 -c z1.c
during IPA pass: targetclone
z1.c:6:1: internal compiler error: in create_dispatcher_calls, at
multiple_target.c:147
int weaks (int i) __attribute__((weak, alias("foo")));
^~~
0x11d66f9 create_dispatcher_calls
../../gcc/multiple_target.c:147
0x11d66f9 ipa_target_clone
../../gcc/multiple_target.c:408
0x11d66f9 execute
../../gcc/multiple_target.c:437
>From gcc-bugs-return-596255-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 18:12:56 2018
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Subject: [Bug target/84700] [6/7/8 Regression] ICE on 32-bit BE powerpc targets w/ -misel -O1
Date: Mon, 05 Mar 2018 18:12:00 -0000
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--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
That patch is pre-approved if it tests fine. Thanks!
>From gcc-bugs-return-596257-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 18:13:33 2018
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Subject: [Bug c/84723] New: [8 Regression] ICE in create_target_clone, at multiple_target.c:275
Date: Mon, 05 Mar 2018 18:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84723
Bug ID: 84723
Summary: [8 Regression] ICE in create_target_clone, at
multiple_target.c:275
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
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Changed between 20170723 and 20170820 (on x86_64/linux) :
$ cat z1.c
__attribute__((target_clones("avx","arch=core-avx2","default")))
__attribute__((naked))
void foo (void)
{
}
$ gcc-8-20170723 -c z1.c
z1.c:4:1: warning: 'naked' attribute directive ignored [-Wattributes]
{
^
$
$ gcc-8-20180304 -c z1.c
during IPA pass: targetclone
z1.c:5:1: internal compiler error: Segmentation fault
}
^
0xaed10f crash_signal
../../gcc/toplev.c:325
0x11d6028 create_target_clone
../../gcc/multiple_target.c:275
0x11d6028 expand_target_clones
../../gcc/multiple_target.c:346
0x11d6028 ipa_target_clone
../../gcc/multiple_target.c:404
0x11d6028 execute
../../gcc/multiple_target.c:437
>From gcc-bugs-return-596256-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 18:13:23 2018
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Subject: [Bug c/84721] [8 Regression] ICE in c_push_function_context, at c-decl.c:9667
Date: Mon, 05 Mar 2018 18:13:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-invalid-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-05
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |8.0
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r255569. -gno-statement-frontiers helps.
>From gcc-bugs-return-596258-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 18:37:31 2018
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Subject: [Bug target/84719] gcc's __builtin_memcpy performance with certain number of bytes is terrible compared to clang's
Date: Mon, 05 Mar 2018 18:37:00 -0000
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--- Comment #5 from gpnuma at centaurean dot com ---
Which gcc and which clang ?
Because on my platform, in the above code, if you isolate 3 bytes at a time and
5 bytes at a time it is way slower than clang (by doing manual unrolling).
Or maybe it's the interaction with the bit masking that causes a problem ?
(In reply to H.J. Lu from comment #4)
> I compared __builtin_memcpy one size at a time. Here are results in
> cycles:
>
> clang 1 bytes: 17193410146
> gcc 1 bytes: 15440244966
> clang 2 bytes: 8997535880
> gcc 2 bytes: 8147449530
> clang 3 bytes: 6002276628
> gcc 3 bytes: 5430387704
> clang 4 bytes: 4497121282
> gcc 4 bytes: 4069604454
> clang 5 bytes: 3644879742
> gcc 5 bytes: 3258094970
> clang 6 bytes: 3045612708
> gcc 6 bytes: 2728410608
> clang 7 bytes: 2574110178
> gcc 7 bytes: 2330365680
> clang 8 bytes: 969894432
> gcc 8 bytes: 6436950208
>
> GCC is faster except for 8 byte size.
>From gcc-bugs-return-596260-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 18:41:40 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/84709] Cannot define method with same name of previously using declared class
Date: Mon, 05 Mar 2018 18:41:00 -0000
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Right, it's not relevant. The rule is not really about hiding ::Foo and making
a name inaccessible, it's about the name "Foo" changing meaning in the class
scope.
Consider:
struct Foo { };
struct Bar {
Foo f1 = Foo();
const Foo &Foo() const;
Foo f2 = Foo();
};
At the point of declaration of f1 Foo() means constructing a ::Foo object (and
whether that is really A::Foo is irrelevant) and at the point of declaration of
f2 it means calling the Bar::Foo() function. The meaning of Foo has changed,
and so the class is ill-formed.
>From gcc-bugs-return-596259-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 18:41:27 2018
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Subject: [Bug target/84719] gcc's __builtin_memcpy performance with certain number of bytes is terrible compared to clang's
Date: Mon, 05 Mar 2018 18:41:00 -0000
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--- Comment #6 from gpnuma at centaurean dot com ---
If you compile the following code (-O3 being the only flag used) :
#include <sys/stat.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
int main(int argc, char *argv[]) {
const uint64_t size = 1000000000;
const size_t alloc_mem = size * sizeof(uint8_t);
uint8_t *mem = malloc(alloc_mem);
for (uint_fast64_t i = 0; i < size; i++)
mem[i] = (uint8_t) (i >> 7);
uint_fast64_t counter = 0;
uint64_t total = 0x123456789abcdefllu;
uint64_t receiver = 0;
printf("%u ...\n", 3);
counter = 0;
while (counter < size - 8) {
__builtin_memcpy(&receiver, &mem[counter], 3);
receiver &= (0xffffffffffffffffllu >> (64 - ((3) << 3)));
total += ((receiver * 0x321654987cbafedllu) >> 48);
counter += 3;
}
printf("=> %llu\n", total);
return EXIT_SUCCESS;
}
Here are the results :
gcc
time ./a.out
3 ...
=> 81996806116422545
real 0m4.145s
user 0m3.691s
sys 0m0.396s
clang
time ./a.out
3 ...
=> 81996806116422545
real 0m1.246s
user 0m0.855s
sys 0m0.374s
4x faster
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Subject: [Bug c++/84702] [8 Regression] internal compiler error: in tsubst_copy, at cp/pt.c:15082
Date: Mon, 05 Mar 2018 18:44:00 -0000
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Nathan Sidwell <nathan at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Fixed r258258.
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Subject: [Bug c++/84702] [8 Regression] internal compiler error: in tsubst_copy, at cp/pt.c:15082
Date: Mon, 05 Mar 2018 18:45:00 -0000
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--- Comment #4 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Author: nathan
Date: Mon Mar 5 18:44:24 2018
New Revision: 258258
URL: https://gcc.gnu.org/viewcvs?rev=258258&root=gcc&view=rev
Log:
[PR c++/84702] ICE with default tmpl arg of overload set
https://gcc.gnu.org/ml/gcc-patches/2018-03/msg00227.html
PR c++/84702
* pt.c (process_template_arg): Mark lookup_keep on a default arg.
PR c++/84702
* g++.dg/lookup/pr84702.C: New.
Added:
trunk/gcc/testsuite/g++.dg/lookup/pr84702.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/pt.c
trunk/gcc/testsuite/ChangeLog
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84719] gcc's __builtin_memcpy performance with certain number of bytes is terrible compared to clang's
Date: Mon, 05 Mar 2018 18:48:00 -0000
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--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I wonder if this is not __builtin_memcpy but rather how to optimize and putting
in the lower bytes of an uint64_t. I think your benchmark is not benchmarking
what you think it is benchmarking.
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Subject: [Bug c++/84724] New: internal compiler error: in single_succ_edge, at basic-block.h:339
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Bug ID: 84724
Summary: internal compiler error: in single_succ_edge, at
basic-block.h:339
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Keywords: ice-on-invalid-code
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vegard.nossum at gmail dot com
CC: webrown.cpp at gmail dot com
Target Milestone: ---
Input:
int __builtin_trap();
int a() {
int b;
int c(&b);
return b %= b ? c : 0;
}
Output:
$ xgcc -x c++ -O3 -fpermissive -fno-toplevel-reorder -S -
<stdin>:1:5: warning: new declaration 'int __builtin_trap()' ambiguates
built-in declaration 'void __builtin_trap()' [-Wbuiltin-declaration-mismatch]
<stdin>: In function 'int a()':
<stdin>:5:9: warning: invalid conversion from 'int*' to 'int' [-fpermissive]
<stdin>:3:5: error: wrong outgoing edge flags at end of bb 4
during GIMPLE pass: isolate-paths
<stdin>:3:5: internal compiler error: in single_succ_edge, at basic-block.h:339
0x32700db single_succ_edge
/home/vegard/git/gcc/gcc/basic-block.h:339
0x328b157 single_succ
/home/vegard/git/gcc/gcc/basic-block.h:359
0x328b157 gimple_verify_flow_info
/home/vegard/git/gcc/gcc/tree-cfg.c:5792
0x185db91 verify_flow_info()
/home/vegard/git/gcc/gcc/cfghooks.c:263
0x33140ac checking_verify_flow_info
/home/vegard/git/gcc/gcc/cfghooks.h:198
0x33140ac cleanup_tree_cfg_noloop
/home/vegard/git/gcc/gcc/tree-cfgcleanup.c:920
0x33140ac cleanup_tree_cfg()
/home/vegard/git/gcc/gcc/tree-cfgcleanup.c:971
0x2b6aaa4 execute_function_todo
/home/vegard/git/gcc/gcc/passes.c:1947
0x2b73d16 do_per_function
/home/vegard/git/gcc/gcc/passes.c:1659
0x2b73d16 execute_todo
/home/vegard/git/gcc/gcc/passes.c:2048
$ xgcc --version
xgcc (GCC) 8.0.1 20180303 (experimental)
Built from git 0d86c284d085d29782d862600a79aa1ff0ee0c47 (r258221).
7.3.0 fails differently:
<source>:3:5: internal compiler error: in expand_gimple_basic_block, at
cfgexpand.c:5457
6.3.0 apparently succeeds in compiling it.
Test case was minimised by C-Reduce.
>From gcc-bugs-return-596265-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 18:52:26 2018
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Subject: [Bug target/84570] [og7, openacc, nvptx] Unused offloaded function parameters
Date: Mon, 05 Mar 2018 18:52:00 -0000
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cesar at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
CC| |cesar at gcc dot gnu.org
--- Comment #1 from cesar at gcc dot gnu.org ---
First, variable 'i' is private, so it shouldn't require a param argument.
What we really need here is proper data flow analysis during gimplification.
That would solve a lot of performance issues, including privatizing
uninitialized, privatizing variables only live inside a parallel region, not
transferring unused variables, not copying out dead variables, etc.
I like the idea of privatizing uninitialized variables, but if I'm not
mistaken, that would still require DF information. It looks like that
information doesn't become available until the gimple code goes into SSA.
As an alternative, I proposed postponing the outlining of omp/acc regions until
the SSA information is available. But then that approach would have its own set
of problems.
>From gcc-bugs-return-596266-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 19:02:41 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84725] New: enable attribute nonstring for all narrow character types
Date: Mon, 05 Mar 2018 19:02:00 -0000
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Bug ID: 84725
Summary: enable attribute nonstring for all narrow character
types
Product: gcc
Version: 8.0
Status: UNCONFIRMED
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Priority: P3
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Attribute nonstring newly added in GCC is only accepted on arrays or pointers
to plain char (see the test case below). However, as discussed in the thread
Re: [PATCH] Support the nonstring variable attribute (gcc >= 8), Linux kernel
developers would find the new attribute nonstring useful with all narrow
character types, including signed char and unsigned char:
https://www.spinics.net/lists/kernel/msg2737596.html
This bug tracks that change.
$ cat z.c && gcc -O2 -S -Wall z.c
struct S
{
char __attribute__ ((nonstring)) a[4];
signed char __attribute__ ((nonstring)) b[4];
unsigned char __attribute__ ((nonstring)) c[4];
char __attribute__ ((nonstring)) *p;
signed char __attribute__ ((nonstring)) *q;
unsigned char __attribute__ ((nonstring)) *r;
};
z.c:4:3: warning: ‘nonstring’ attribute ignored on objects of type ‘signed
char[4]’ [-Wattributes]
signed char __attribute__ ((nonstring)) b[4];
^~~~~~
z.c:5:3: warning: ‘nonstring’ attribute ignored on objects of type ‘unsigned
char[4]’ [-Wattributes]
unsigned char __attribute__ ((nonstring)) c[4];
^~~~~~~~
z.c:8:3: warning: ‘nonstring’ attribute ignored on objects of type ‘signed char
*’ [-Wattributes]
signed char __attribute__ ((nonstring)) *q;
^~~~~~
z.c:9:3: warning: ‘nonstring’ attribute ignored on objects of type ‘unsigned
char *’ [-Wattributes]
unsigned char __attribute__ ((nonstring)) *r;
^~~~~~~~
>From gcc-bugs-return-596267-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 19:03:11 2018
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Subject: [Bug tree-optimization/84725] enable attribute nonstring for all narrow character types
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-03-05
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Ever confirmed|0 |1
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Let me make the change.
>From gcc-bugs-return-596268-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 19:10:13 2018
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Subject: [Bug fortran/56667] Syntax error causes misleading message: "Expected PARAMETER symbol in complex constant"
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kargl at gcc dot gnu.org changed:
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CC| |kargl at gcc dot gnu.org
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--- Comment #3 from kargl at gcc dot gnu.org ---
(In reply to Dominique d'Humieres from comment #2)
> How difficult would it be to provide better message? Is it worth the work?
> If no, this PR could be closed as WONTFIX.
I have a patch. The problem is the matcher for a complex entity
runs prior to the matcher for an implied do-loop. Errors are
queued in that order so the slightly obtuse error message is
emitted.
https://gcc.gnu.org/ml/fortran/2018-03/msg00018.html
>From gcc-bugs-return-596269-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 19:12:45 2018
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From: "cesar at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84571] [og7, openacc, nvptx] 32-bit value passed in 64 bits to offloading function
Date: Mon, 05 Mar 2018 19:12:00 -0000
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cesar at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
CC| |cesar at gcc dot gnu.org
--- Comment #1 from cesar at gcc dot gnu.org ---
The is the legacy firstprivate_int optimization. Prior to the param state
optimization, GCC used to build a struct of pointers to all of the data
mappings used by an offloaded region. That struct would then be passed to the
offloaded function. To optimize the transfer of firstprivate integer values,
Jakub introduced an GOMP_MAP_FIRSTPRIVATE_INT data mapping, which effective
converts 32-bit ints to 64-bit ints. The advantage here is that those
firstprivate values do not require a separate data mapping, because the 64-bt
int is casted into a dummy pointer. There should be on-device code to reconvert
that 64-bit int into a 32-bit int. If not, there's a bug somewhere.
With regards to OpenACC code passing data mappings to offloaded functions
directly via function arguments, it's not clear if the approach I took is
optimal for all targets. So, maybe when it comes time to upstream that patch,
it could be rewritten as a separate device-specific pass which expands struct
containing all of the offloaded data mappings into individual function
arguments.
>From gcc-bugs-return-596270-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 19:48:52 2018
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Subject: [Bug target/84264] [8 Regression] ICE in rs6000_emit_le_vsx_store, at config/rs6000/rs6000.c:10367 starting with r256656
Date: Mon, 05 Mar 2018 19:48:00 -0000
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Peter Bergner <bergner at gcc dot gnu.org> changed:
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--- Comment #8 from Peter Bergner <bergner at gcc dot gnu.org> ---
Fixed on trunk.
>From gcc-bugs-return-596271-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 20:07:13 2018
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Subject: [Bug c++/60230] internal compiler error on lambdas capturing multidimensional arrays with dynamic boundary
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Jason Merrill <jason at gcc dot gnu.org> changed:
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--- Comment #8 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Paolo Carlini from comment #6)
> Jason, in 8, at variance with 7, for this testcase and its Dups we issue a
> proper error message mentioning N3639 and no ICE. I think we can resolve the
> bug, right?
Yes, my fix was marked with PR 84560. Actually allowing this code would be an
extension beyond what was allowed under the abandoned array TS.
*** This bug has been marked as a duplicate of bug 84560 ***
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Subject: [Bug c++/54367] [meta-bug] lambda expressions
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Bug 54367 depends on bug 60230, which changed state.
Bug 60230 Summary: internal compiler error on lambdas capturing multidimensional arrays with dynamic boundary
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60230
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
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Subject: [Bug c++/84560] [6/7/8 Regression] Internal error in std::function with std::memset
Date: Mon, 05 Mar 2018 20:07:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
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CC| |moezzia at gmail dot com
--- Comment #7 from Jason Merrill <jason at gcc dot gnu.org> ---
*** Bug 60230 has been marked as a duplicate of this bug. ***
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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/84726] New: [8 regression] Unnecessary lambda capture of constant variables
Date: Mon, 05 Mar 2018 20:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84726
Bug ID: 84726
Summary: [8 regression] Unnecessary lambda capture of constant
variables
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: ABI
Severity: normal
Priority: P3
Component: c++
Assignee: jason at gcc dot gnu.org
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wg21.link/p0588 changes i from not captured to captured by the lambda in this
testcase, but an implementation is allowed to optimize away that capture if it
doesn't affect the semantics of the program. Since we didn't capture it in
previous versions of GCC, the optimization is desirable to avoid an ABI change.
int main()
{
const int i = 42;
auto l = [=]{return i;};
if (sizeof(l) > 1)
__builtin_abort ();
}
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Subject: [Bug c++/84726] [8 regression] Unnecessary lambda capture of constant variables
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Jason Merrill <jason at gcc dot gnu.org> changed:
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Subject: [Bug c++/84726] [8 regression] Unnecessary lambda capture of constant variables
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Jason Merrill <jason at gcc dot gnu.org> changed:
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>From gcc-bugs-return-596277-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 20:34:53 2018
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Subject: [Bug c++/84726] [8 regression] Unnecessary lambda capture of constant variables
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--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> ---
Optimizing it away is allowed by 8.4.5.1p2:
An implementation may define the closure type differently from what is
described below provided this does not alter the observable behavior of the
program other than by changing:
— the size and/or alignment of the closure type,
— whether the closure type is trivially copyable (Clause 12), or
— whether the closure type is a standard-layout class (Clause 12).
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Subject: [Bug c++/79937] [6/7/8 Regression] ICE in replace_placeholders_r
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Jason Merrill <jason at gcc dot gnu.org> changed:
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--- Comment #11 from Jason Merrill <jason at gcc dot gnu.org> ---
Consider also
struct X
{
unsigned i;
unsigned n = bar(X{2,i});
};
which would also have an X PLACEHOLDER_EXPR, but it would refer to the outer X
rather than the temporary.
It seems like maybe we need to defer NSDMI expansion in aggregate
initialization until we know which object we're initializing.
But Jakub's patch is an improvement over what we have now, and may be the right
choice for GCC 8.
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Subject: [Bug tree-optimization/84725] enable attribute nonstring for all narrow character types
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2018-03/msg00237.html
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From: "manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/54687] Use gcc option machinery for gfortran
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--- Comment #14 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Dominique d'Humieres from comment #13)
> No activity since over two years. Any objection to close this PR as FIXED?
I personally don't mind since I don't use gfortran and I am not planning to
work on this, but if somebody ever wanted to fix this, the information above
would be useful.
In a nutshell, gfortran duplicates a lot of the common machinery, which is a
waste of both time (since the options are processed anyway by the common
machinery and then again by gfortran) and space (since gfortran uses its own
structures for options that are already present in the common machinery). Also,
improvements in the common machinery do not benefit gfortran.
Comment #12 explains what's left to do.
On the other hand, the benefits of what remains to be done are likely small.
Not even the C/C++ FE are making full use of the common machinery.
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Subject: [Bug fortran/66128] ICE for some intrinsics with zero sized array parameter
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--- Comment #14 from kargl at gcc dot gnu.org ---
(In reply to Thomas Koenig from comment #11)
> According to your mail at (In reply to kargl from comment #10)
>
> > Closing as fixed.
>
> https://gcc.gnu.org/ml/fortran/2018-03/msg00010.html still shows a few
> tests that fail.
>
> Let's keep this PR open to track these.
First, I should note that the URL does not lead to a list
of tests that fail. It points to a list of intrinsic
subrprogram where the Fortran standard specifically
calls out behavior for dummy arguments associated with
a size zero actual argument. No tests were written
or performed.
Item 1) is covered by PR 54613
Item 2) is now PR 84697.
Items 3)-5) do not exhibit any unexpected behavior.
Item 6) concerns old g77 compatibility routines
I won't check those as no one should be using these
routines.
This PR should be closed, but I'll leave that up to
others.
>From gcc-bugs-return-596282-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 21:35:57 2018
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Subject: [Bug c++/84708] [8 Regression] internal compiler error: in lambda_expr_this_capture, at cp/lambda.c:772
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Jason Merrill <jason at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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CC| |jason at gcc dot gnu.org
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>From gcc-bugs-return-596283-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 21:39:11 2018
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Subject: [Bug fortran/70913] ICE in gfc_encode_character, at fortran/target-memory.c:227
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Harald Anlauf <anlauf at gmx dot de> changed:
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--- Comment #5 from Harald Anlauf <anlauf at gmx dot de> ---
(In reply to Gerhard Steinmetz from comment #3)
> Another situation :
>
> $ cat z4.f90
> program p
> character(3) :: a(2) = ['abc', 'xyz']
> character(3) :: b(1,2) = ' '
> equivalence (b, a)
> end
>
> $ gfortran-6 z4.f90
> internal compiler error: in gfc_encode_character, at
> fortran/target-memory.c:227
>
> ---
>
> Interestingly, this works without initializer of b :
It is not important that b is of rank 2, the ICE occurs also for
character(3) :: b(2) = ' '
Running under the debugger, the assert
220 gfc_encode_character (int kind, size_t length, const gfc_char_t
*string,
221 unsigned char *buffer, size_t buffer_size)
222 {
223 size_t elsize = size_character (1, kind);
224 tree type = gfc_get_char_type (kind);
225
226 gcc_assert (buffer_size >= size_character (length, kind));
appears to be triggered by a call with buffer_size=0 while processing the
equivalence. This can also be guessed by looking at the backtrace.
>From gcc-bugs-return-596284-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 21:49:32 2018
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Subject: [Bug fortran/84218] ICE in free_expr0, at fortran/expr.c:451
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Harald Anlauf <anlauf at gmx dot de> changed:
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--- Comment #4 from Harald Anlauf <anlauf at gmx dot de> ---
The implied do variants z1, z2, and z3 are now rejected,
probably by Steve's recent patch.
z4 is fine.
Is there anything left, or can this PR be closed?
>From gcc-bugs-return-596285-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 21:54:23 2018
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Subject: [Bug fortran/84218] ICE in free_expr0, at fortran/expr.c:451
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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----------------------------------------------------------------------------
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--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> The implied do variants z1, z2, and z3 are now rejected,
> probably by Steve's recent patch.
>
> z4 is fine.
>
> Is there anything left, or can this PR be closed?
Confirmed, closing as FIXED.
>From gcc-bugs-return-596286-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 22:08:55 2018
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Subject: [Bug c++/82611] Incorrect warning for redundant capture in lambda
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--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
By the way, both clang and icc emit an *hard error*, not just a warning for
this usage. Consider yourself lucky ;)
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Subject: [Bug c++/84684] inserting random code / flags produces wrong code
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--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Mar 5 22:12:45 2018
New Revision: 258262
URL: https://gcc.gnu.org/viewcvs?rev=258262&root=gcc&view=rev
Log:
PR c++/84684
* constexpr.c (constexpr_call_hasher::equal): Return false if
lhs->hash != rhs->hash. Change return 1 to return true and
return 0 to return false.
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/constexpr.c
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Subject: [Bug target/84700] [6/7/8 Regression] ICE on 32-bit BE powerpc targets w/ -misel -O1
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Mar 5 22:13:58 2018
New Revision: 258263
URL: https://gcc.gnu.org/viewcvs?rev=258263&root=gcc&view=rev
Log:
PR target/84700
* combine.c (combine_simplify_rtx): Don't try to simplify if
if_then_else_cond returned non-NULL, but either true_rtx or false_rtx
are equal to x.
* gcc.target/powerpc/pr84700.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/powerpc/pr84700.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/combine.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/84708] [8 Regression] internal compiler error: in lambda_expr_this_capture, at cp/lambda.c:772
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--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Mon Mar 5 22:14:38 2018
New Revision: 258264
URL: https://gcc.gnu.org/viewcvs?rev=258264&root=gcc&view=rev
Log:
PR c++/84708 - ICE with lambda in local class NSDMI.
* lambda.c (lambda_expr_this_capture): Handle local class NSDMI
context.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-nsdmi9.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/lambda.c
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Subject: [Bug target/84700] [6/7 Regression] ICE on 32-bit BE powerpc targets w/ -misel -O1
Date: Mon, 05 Mar 2018 22:19:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Summary|[6/7/8 Regression] ICE on |[6/7 Regression] ICE on
|32-bit BE powerpc targets |32-bit BE powerpc targets
|w/ -misel -O1 |w/ -misel -O1
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed on the trunk so far.
>From gcc-bugs-return-596291-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 22:41:23 2018
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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84708] [8 Regression] internal compiler error: in lambda_expr_this_capture, at cp/lambda.c:772
Date: Mon, 05 Mar 2018 22:41:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed.
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From: "npiggin at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84627] powerpc excess padding generated for POWER9 target
Date: Mon, 05 Mar 2018 22:42:00 -0000
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Nicholas Piggin <npiggin at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|INVALID |FIXED
--- Comment #4 from Nicholas Piggin <npiggin at gmail dot com> ---
After some more discussion and testing, it was determined that for POWER9, 16
bytes of padding is sufficient for these small loops and was adjusted.
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=258260
Author: segher
Date: Mon Mar 5 19:11:54 2018 UTC (3 hours, 27 minutes ago)
Log Message:
rs6000: Don't align tiny loops to 32 bytes for POWER9
For POWER4..POWER8 we align loops of 5..8 instructions to 32 bytes
(instead of to 16 bytes) because that executes faster. This is no
longer the case on POWER9, so we can just as well only align to 16
bytes.
* config/rs6000/rs6000.c (rs6000_loop_align): Don't align tiny loops
to 32 bytes when compiling for POWER9.
>From gcc-bugs-return-596293-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 22:53:58 2018
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From: "gpnuma at centaurean dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84719] gcc's __builtin_memcpy performance with certain number of bytes is terrible compared to clang's
Date: Mon, 05 Mar 2018 22:53:00 -0000
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--- Comment #8 from gpnuma at centaurean dot com ---
Just to make sure I commented out bit masking :
#include <sys/stat.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
int main(int argc, char *argv[]) {
const uint64_t size = 1000000000;
const size_t alloc_mem = size * sizeof(uint8_t);
uint8_t *mem = malloc(alloc_mem);
for (uint_fast64_t i = 0; i < size; i++)
mem[i] = (uint8_t) (i >> 7);
uint_fast64_t counter = 0;
uint64_t total = 0x123456789abcdefllu;
uint64_t receiver = 0;
printf("%u ...\n", 3);
counter = 0;
while (counter < size - 8) {
__builtin_memcpy(&receiver, &mem[counter], 3);
// receiver &= (0xffffffffffffffffllu >> (64 - ((3) << 3)));
total += ((receiver * 0x321654987cbafedllu) >> 48);
counter += 3;
}
printf("=> %llu\n", total);
return EXIT_SUCCESS;
}
Results are exactly the same :
gcc
time ./a.out
3 ...
=> 81996806116422545
real 0m3.771s
user 0m3.292s
sys 0m0.403s
clang
time ./a.out
3 ...
=> 81996806116422545
real 0m1.209s
user 0m0.833s
sys 0m0.359s
Still 4x faster
>From gcc-bugs-return-596294-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Mar 05 23:02:20 2018
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From: "romain.geissler at amadeus dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84727] New: [8 regression] Constant class initialization not detected as such
Date: Mon, 05 Mar 2018 23:02:00 -0000
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Bug ID: 84727
Summary: [8 regression] Constant class initialization not
detected as such
Product: gcc
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Hi,
There appear to be a recent regression, triggered when compiling tcmalloc. This
snippet:
#include <stdint.h>
// A safe way of doing "(1 << n) - 1" -- without worrying about overflow
// Note this will all be resolved to a constant expression at compile-time
#define N_ONES_(IntType, N) \
( (N) == 0 ? 0 : ((static_cast<IntType>(1) << ((N)-1))-1 + \
(static_cast<IntType>(1) << ((N)-1))) )
template <int> class A
{
public:
static const int kValuebits = 7;
private:
// With the template version, this fails.
static const uint32_t kValueMask = N_ONES_(uint32_t, kValuebits);
};
class B
{
public:
static const int kValuebits = 7;
private:
// With the non-template version, this works.
static const uint32_t kValueMask = N_ONES_(uint32_t, kValuebits);
};
used to build fine (with no special options) with g++ (GCC) 8.0.1 20180224
(experimental) but fails with g++ (GCC) 8.0.1 20180301 (experimental):
file.cpp:7:59: error: non-constant in-class initialization invalid for static
member 'A<<anonymous> >::kValueMask'
(static_cast<IntType>(1) << ((N)-1))) )
^
file.cpp:16:44: note: in expansion of macro 'N_ONES_'
static const uint32_t kValueMask = N_ONES_(uint32_t, kValuebits);
^~~~~~~
file.cpp:7:59: note: (an out of class initialization is required)
(static_cast<IntType>(1) << ((N)-1))) )
^
file.cpp:16:44: note: in expansion of macro 'N_ONES_'
static const uint32_t kValueMask = N_ONES_(uint32_t, kValuebits);
^~~~~~~
Cheers,
Romain
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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/81572] [7 Regression] gcc-7 regression: unnecessary vector regmove on compare
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Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Peter Bergner <bergner at gcc dot gnu.org> ---
Thanks for fixing this Vlad! Since this is a GCC 7 regression, can we get this
back ported there too? If it would help, I can do the bootstrap, regtesting
and commit.
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From: "romain.geissler at amadeus dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84727] [8 regression] Constant class initialization not detected as such
Date: Mon, 05 Mar 2018 23:12:00 -0000
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--- Comment #1 from Romain Geissler <romain.geissler at amadeus dot com> ---
Mmmh on Godbolt it seems to work with the gcc from today:
https://godbolt.org/g/91wxk7
So it's has been most likely fixed in the meantime.
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Subject: [Bug target/81572] [7 Regression] gcc-7 regression: unnecessary vector regmove on compare
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--- Comment #6 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
(In reply to Peter Bergner from comment #5)
> Thanks for fixing this Vlad! Since this is a GCC 7 regression, can we get
> this back ported there too? If it would help, I can do the bootstrap,
> regtesting and commit.
Yes, I think it is safe to backport it. Thank you for your help, Peter.
>From gcc-bugs-return-596298-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 01:33:57 2018
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Subject: [Bug c++/84724] [7/8 Regression] internal compiler error: in single_succ_edge, at basic-block.h:339 with a declaration of __builtin_trap
Date: Tue, 06 Mar 2018 01:33:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84724
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-06
CC| |msebor at gcc dot gnu.org
Known to work| |6.4.0
Summary|internal compiler error: in |[7/8 Regression] internal
|single_succ_edge, at |compiler error: in
|basic-block.h:339 |single_succ_edge, at
| |basic-block.h:339 with a
| |declaration of
| |__builtin_trap
Ever confirmed|0 |1
Known to fail| |7.3.0, 8.0
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed with r244114 (gcc 7.0.0) as the first revision to ICE:
r244114 | jakub | 2017-01-05 16:14:19 -0500 (Thu, 05 Jan 2017) | 12 lines
PR tree-optimization/71016
Prior to that GCC accepted the test case (with -fpermissive):
t.C:2:5: warning: new declaration ‘int __builtin_trap()’ ambiguates built-in
declaration ‘void __builtin_trap()’ [-Wbuiltin-declaration-mismatch]
int __builtin_trap();
^~~~~~~~~~~~~~
t.C: In function ‘int a()’:
t.C:6:9: warning: invalid conversion from ‘int*’ to ‘int’ [-fpermissive]
int c(&b);
^~
A simpler test case is
int __builtin_trap ();
int a (int i)
{
const char *p = i < 0 ? 0 : "";
return *p;
}
The trouble seems to be that __builtin_trap is expected not to return but the
extern C++ declaration in the program says otherwise and overrides the
built-in. I'd say re-declarations of built-ins that GCC itself depends
on/makes assumptions about should be rejected with a hard error.
>From gcc-bugs-return-596299-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 02:52:02 2018
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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/83969] [8 Regression] ICE in final_scan_insn, at final.c:2997 (error: could not split insn) for powerpc targets
Date: Tue, 06 Mar 2018 02:52:00 -0000
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Peter Bergner <bergner at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |bergner at gcc dot gnu.org
--- Comment #10 from Peter Bergner <bergner at gcc dot gnu.org> ---
This looks like a similar bug I fixed in PR84279, namely mem_operand_gpr()
accepting addresses that are not offsettable.
In this specific bug, we don't have an altivec address, but we do have an index
address which also should be rejected for the "Y" constraint. Replacing the
fix for PR84279 with a test for offsettable_address_p() instead fixes both
ICEs. I'm testing the following patch which mimics the code for
mem_operand_ds_form():
Index: gcc/config/rs6000/rs6000.c
===================================================================
--- gcc/config/rs6000/rs6000.c (revision 258267)
+++ gcc/config/rs6000/rs6000.c (working copy)
@@ -8207,10 +8207,8 @@ mem_operand_gpr (rtx op, machine_mode mo
int extra;
rtx addr = XEXP (op, 0);
- /* Don't allow altivec type addresses like (mem (and (plus ...))).
- See PR target/84279. */
-
- if (GET_CODE (addr) == AND)
+ /* Don't allow non-offsettable addresses. See PRs 83969 and 84279. */
+ if (!offsettable_address_p (false, mode, addr))
return false;
op = address_offset (addr);
>From gcc-bugs-return-596300-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 03:15:56 2018
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/71169] [7/8 Regression] ICE on invalid C++ code in pop_nested_class (cp/class.c:7785)
Date: Tue, 06 Mar 2018 03:15:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Mine.
>From gcc-bugs-return-596301-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 03:16:41 2018
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/71832] [7/8 Regression] ICE on invalid C++11 code with incorrect decltype use for non-type template parameter: Segmentation fault
Date: Tue, 06 Mar 2018 03:16:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #6 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Mine.
>From gcc-bugs-return-596302-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 03:22:55 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/84723] [8 Regression] ICE in create_target_clone, at multiple_target.c:275
Date: Tue, 06 Mar 2018 03:22:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-06
CC| |msebor at gcc dot gnu.org
Ever confirmed|0 |1
Known to fail| |8.0
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed. The first revision to ICE is r250736 (gcc 8.0.0), which is also
where attribute naked was added.
r250736 | uros | 2017-07-31 06:22:41 -0400 (Mon, 31 Jul 2017) | 23 lines
PR target/25967
* config/i386/i386.c (ix86_function_naked): New function.
(ix86_can_use_return_insn_p): Return false for naked functions.
(ix86_expand_prologue): Skip prologue for naked functions.
(ix86_expand_epilogue): Skip epilogue for naked functions
and emit trap instruction.
(ix86_warn_func_return): New function.
(ix86_attribute_table): Add "naked" attribute specification.
(TARGET_WARN_FUNC_RETURN): Define.
* doc/extend.texi (x86 Function Attributes) <naked>: Document it.
Another test case:
__attribute__((target_clones ("avx", "default")))
__attribute__((noclone))
void foo (void) { }
The create_target_clone() function assumes the call to
cgraph_node::create_version_clone_with_body() succeeds, which isn't necessarily
the case.
But mutually exclusive attributes should be detected earlier on, during
parsing, so if target_clones is incompatible with naked, GCC should issue a
warning and drop the latter attribute.
>From gcc-bugs-return-596303-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 03:25:20 2018
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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/70409] Silent truncation of character parameters with len=huge()
Date: Tue, 06 Mar 2018 03:25:00 -0000
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kargl at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
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--- Comment #2 from kargl at gcc dot gnu.org ---
I have a patch. To be submitted after I write a testcase.
>From gcc-bugs-return-596304-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 06:25:18 2018
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From: "aoliva at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/84492] [8 Regression] ICE with statement expression
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--- Comment #4 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Author: aoliva
Date: Tue Mar 6 06:24:40 2018
New Revision: 258269
URL: https://gcc.gnu.org/viewcvs?rev=258269&root=gcc&view=rev
Log:
[PR c++/84492] stmt expr ending with overload
We ICEd when returning a stmt expr that ends with an overloaded
function, because instantiate_type did not know what to do with
STMT_EXPRs. And it shouldn't have to: the expected type of a stmt
expr cannot be used to resolve its value: an unresolved overload
cannot supply the result of a stmt expr. Catch that and report the
error in the stmt expr before we have a chance to instantiate it.
for gcc/cp/ChangeLog
PR c++/84492
* semantics.c (finish_stmt_expr_expr): Reject unresolved
overloads used as stmt expr values.
for gcc/testsuite/ChangeLog
PR c++/84492
* g++.dg/pr84492.C: New.
Added:
trunk/gcc/testsuite/g++.dg/pr84492.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/semantics.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/84593] [6/7/8 Regression] internal compiler error: Segmentation fault (non_type_check())
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84593
--- Comment #3 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Author: aoliva
Date: Tue Mar 6 06:24:53 2018
New Revision: 258270
URL: https://gcc.gnu.org/viewcvs?rev=258270&root=gcc&view=rev
Log:
[PR c++/84593] ice on braced init with uninit ref field
If an initializer expr is to be NULL in a ctor initializer list, we
ICE in picflag_from_initializer and elsewhere.
If we're missing an initializer for a reference field, we report the
error, but then build a zero initializer to avoid the ICE.
for gcc/cp/ChangeLog
PR c++/84593
* init.c (build_zero_init_1): Zero-initialize references.
for gcc/testsuite/ChangeLog
PR c++/84593
* g++.dg/cpp1y/pr84593.C: New.
Added:
trunk/gcc/testsuite/g++.dg/cpp1y/pr84593.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/init.c
trunk/gcc/testsuite/ChangeLog
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84231
--- Comment #5 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Author: aoliva
Date: Tue Mar 6 06:25:12 2018
New Revision: 258271
URL: https://gcc.gnu.org/viewcvs?rev=258271&root=gcc&view=rev
Log:
[C++] [PR84231] overload on cond_expr in template
A non-type-dependent COND_EXPR within a template is reconstructed with
the original operands, after one with non-dependent proxies is built to
determine its result type. This is problematic because the operands of
a COND_EXPR determined to be an rvalue may have been converted to denote
their rvalue nature. The reconstructed one, however, won't have such
conversions, so lvalue_kind may not recognize it as an rvalue, which may
lead to e.g. incorrect overload resolution decisions.
If we mistake such a COND_EXPR for an lvalue, overload resolution might
regard a conversion sequence that binds it to a non-const reference as
viable, and then select that over one that binds it to a const
reference. Only after template substitution would we rebuild the
COND_EXPR, realize it is an rvalue, and conclude the reference binding
is ill-formed, but at that point we'd have long discarded any alternate
candidates we could have used.
This patch modifies the logic that determines whether a
(non-type-dependent) COND_EXPR in a template is an lvalue, to rely on
its type, more specifically, on the presence of a REFERENCE_TYPE
wrapper. In order to avoid a type bootstrapping problem, the
REFERENCE_TYPE that wraps the type of some such COND_EXPRs is
introduced earlier, so that we don't have to test for lvalueness of
the expression using the very code that we wish to change.
for gcc/cp/ChangeLog
PR c++/84231
* tree.c (lvalue_kind): Use presence/absence of REFERENCE_TYPE
only while processing template decls.
* typeck.c (build_x_conditional_expr): Move wrapping of
reference type around type...
* call.c (build_conditional_expr_1): ... here. Rename
is_lvalue to is_glvalue.
* parser.c (cp_parser_fold_expression): Catch REFERENCE_REF_P
INDIRECT_REF of COND_EXPR too.
for gcc/testsuite/ChangeLog
PR c++/84231
* g++.dg/pr84231.C: New.
Added:
trunk/gcc/testsuite/g++.dg/pr84231.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/call.c
trunk/gcc/cp/parser.c
trunk/gcc/cp/tree.c
trunk/gcc/cp/typeck.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/84492] [8 Regression] ICE with statement expression
Date: Tue, 06 Mar 2018 06:26:00 -0000
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Alexandre Oliva <aoliva at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Fixed
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Subject: [Bug c++/84593] [6/7/8 Regression] internal compiler error: Segmentation fault (non_type_check())
Date: Tue, 06 Mar 2018 06:26:00 -0000
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Alexandre Oliva <aoliva at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #4 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Fixed
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Alexandre Oliva <aoliva at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #6 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Fixed
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Subject: [Bug tree-optimization/84687] [8 Regression] error: invalid conversion in gimple call with -O3 and -ffast-math
Date: Tue, 06 Mar 2018 07:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84687
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Mar 6 07:06:44 2018
New Revision: 258272
URL: https://gcc.gnu.org/viewcvs?rev=258272&root=gcc&view=rev
Log:
PR tree-optimization/84687
* omp-simd-clone.c (simd_clone_create): Clear DECL_BUILT_IN_CLASS
on new_node->decl.
* match.pd (pow(C,x)*expN(y) -> expN(logN(C)*x+y)): New optimization.
* gcc.dg/pr84687.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr84687.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/match.pd
trunk/gcc/omp-simd-clone.c
trunk/gcc/testsuite/ChangeLog
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From: "vegard.nossum at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84728] New: internal compiler error: Segmentation fault (is_gimple_variable())
Date: Tue, 06 Mar 2018 07:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84728
Bug ID: 84728
Summary: internal compiler error: Segmentation fault
(is_gimple_variable())
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Keywords: ice-on-invalid-code
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vegard.nossum at gmail dot com
CC: webrown.cpp at gmail dot com
Target Milestone: ---
Input:
void a(int b) {
asm("" : "=m" (b) : "0" (({ ; })));
}
Output:
$ xgcc -x c++ -S -g -O1 -
<stdin>: In function 'void a(int)':
<stdin>:2:37: warning: matching constraint does not allow a register
<stdin>:2:37: warning: matching constraint does not allow a register
<stdin>:2:31: internal compiler error: Segmentation fault
0x3152ce9 crash_signal
/home/vegard/git/gcc/gcc/toplev.c:325
0x20f0ce8 is_gimple_variable
/home/vegard/git/gcc/gcc/gimple-expr.h:83
0x20f0ce8 is_gimple_id
/home/vegard/git/gcc/gcc/gimple-expr.h:94
0x20f0ce8 is_gimple_addressable
/home/vegard/git/gcc/gcc/gimple-expr.h:121
0x20f0ce8 is_gimple_lvalue(tree_node*)
/home/vegard/git/gcc/gcc/gimple-expr.c:595
0x222358a gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
/home/vegard/git/gcc/gcc/gimplify.c:12355
0x2242d00 gimplify_asm_expr
/home/vegard/git/gcc/gcc/gimplify.c:6289
0x2219681 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
/home/vegard/git/gcc/gcc/gimplify.c:11766
0x2228401 gimplify_stmt(tree_node**, gimple**)
/home/vegard/git/gcc/gcc/gimplify.c:6658
0x221a50d gimplify_cleanup_point_expr
/home/vegard/git/gcc/gcc/gimplify.c:6400
0x221a50d gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
/home/vegard/git/gcc/gcc/gimplify.c:11811
0x2228401 gimplify_stmt(tree_node**, gimple**)
/home/vegard/git/gcc/gcc/gimplify.c:6658
0x221bc6b gimplify_statement_list
/home/vegard/git/gcc/gcc/gimplify.c:1767
0x221bc6b gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
/home/vegard/git/gcc/gcc/gimplify.c:11863
0x2228401 gimplify_stmt(tree_node**, gimple**)
/home/vegard/git/gcc/gcc/gimplify.c:6658
0x22316c9 gimplify_body(tree_node*, bool)
/home/vegard/git/gcc/gcc/gimplify.c:12635
0x2233a20 gimplify_function_tree(tree_node*)
/home/vegard/git/gcc/gcc/gimplify.c:12800
0x199ff87 cgraph_node::analyze()
/home/vegard/git/gcc/gcc/cgraphunit.c:670
0x19b305b analyze_functions
/home/vegard/git/gcc/gcc/cgraphunit.c:1131
0x19b7d71 symbol_table::finalize_compilation_unit()
/home/vegard/git/gcc/gcc/cgraphunit.c:2691
$ xgcc --version
xgcc (GCC) 8.0.1 20180306 (experimental)
Built from git 11a93d7a09b871b3b9a2eb108eb91ad83d94e070 (r258271).
7.3.0 fails more gracefully with:
<source>: In function 'void a(int)':
<source>:2:37: warning: matching constraint does not allow a register
asm("" : "=m" (b) : "0" (({ ; })));
^
<source>:2:37: warning: matching constraint does not allow a register
<source>:2:37: error: memory input 1 is not directly addressable
Compiler returned: 1
Test case was minimised by C-Reduce.
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Subject: [Bug c++/84729] New: internal compiler error: verify_gimple failed
Date: Tue, 06 Mar 2018 07:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84729
Bug ID: 84729
Summary: internal compiler error: verify_gimple failed
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Keywords: ice-on-invalid-code
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vegard.nossum at gmail dot com
CC: webrown.cpp at gmail dot com
Target Milestone: ---
Input:
typedef int b[2];
void a() {
new b(a);
}
Output:
$ xgcc -x c++ -S -std=c++14 -fpermissive -fno-toplevel-reorder -
<stdin>: In function 'void a()':
<stdin>:4:10: warning: parenthesized initializer in array new [-fpermissive]
<stdin>:3:6: error: non-trivial conversion at assignment
int
void <T85> (void)
*D.2125 = a.1_1;
<stdin>:3:6: internal compiler error: verify_gimple failed
0x32b4a77 verify_gimple_in_seq(gimple*)
/home/vegard/git/gcc/gcc/tree-cfg.c:5247
0x2232b54 gimplify_body(tree_node*, bool)
/home/vegard/git/gcc/gcc/gimplify.c:12710
0x2233a20 gimplify_function_tree(tree_node*)
/home/vegard/git/gcc/gcc/gimplify.c:12800
0x199ff87 cgraph_node::analyze()
/home/vegard/git/gcc/gcc/cgraphunit.c:670
0x19b305b analyze_functions
/home/vegard/git/gcc/gcc/cgraphunit.c:1131
0x19b7d71 symbol_table::finalize_compilation_unit()
/home/vegard/git/gcc/gcc/cgraphunit.c:2691
$ xgcc --version
xgcc (GCC) 8.0.1 20180306 (experimental)
Built from git 11a93d7a09b871b3b9a2eb108eb91ad83d94e070 (r258271).
Seems to have appeared between 4.6.4 and 4.7.1.
Test case was minimised by C-Reduce.
>From gcc-bugs-return-596313-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 07:37:00 2018
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Subject: [Bug tree-optimization/84687] [8 Regression] error: invalid conversion in gimple call with -O3 and -ffast-math
Date: Tue, 06 Mar 2018 07:37:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-596314-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 07:51:23 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84710] [8 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1896 with -O -fno-forward-propagate
Date: Tue, 06 Mar 2018 07:51:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-06
CC| |jakub at gcc dot gnu.org,
| |segher at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This is on try_combine with
i3:
(insn 21 20 22 2 (set (reg:SI 109)
(const_int 0 [0])) "pr84710.c":8 679 {*aarch64_lshr_sisd_or_int_si3}
(expr_list:REG_DEAD (reg:SI 108)
(nil)))
i2:
(insn 20 19 21 2 (set (reg:SI 108)
(zero_extend:SI (subreg:HI (reg:SI 106) 0))) "pr84710.c":8 89
{*zero_extendhisi2_aarch64}
(nil))
i1:
(insn 19 18 20 2 (set (subreg:HI (reg:SI 106) 0)
(const_int 0 [0])) "pr84710.c":8 45 {*movhi_aarch64}
(nil))
and on:
4286 /* It can only be a SET of a REG or of a paradoxical SUBREG of a
REG. */
4287 x = SET_DEST (x);
4288 if (paradoxical_subreg_p (x))
4289 x = SUBREG_REG (x);
4290
4291 unsigned int regno = REGNO (x);
x is:
(subreg:HI (reg:SI 106) 0)
rtl.texi documents the behavior of SUBREGs as lvalues not just for paradoxical
SUBREGs, but also for normal SUBREGs.
So, we have a proof that the paradoxical_subreg_p guard is insufficient.
I'd go with:
--- gcc/combine.c.jj 2018-03-05 23:13:26.478215559 +0100
+++ gcc/combine.c 2018-03-06 08:50:17.756288841 +0100
@@ -4283,9 +4283,9 @@ try_combine (rtx_insn *i3, rtx_insn *i2,
if (GET_CODE (x) == PARALLEL)
x = XVECEXP (newi2pat, 0, 0);
- /* It can only be a SET of a REG or of a paradoxical SUBREG of a REG.
*/
+ /* It can only be a SET of a REG or of a SUBREG of a REG. */
x = SET_DEST (x);
- if (paradoxical_subreg_p (x))
+ if (SUBREG_P (x))
x = SUBREG_REG (x);
unsigned int regno = REGNO (x);
(until proven otherwise).
>From gcc-bugs-return-596315-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 08:01:03 2018
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Subject: [Bug target/84710] [8 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1896 with -O -fno-forward-propagate
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43572
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43572&action=edit
gcc8-pr84710.patch
Full untested patch.
>From gcc-bugs-return-596316-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 08:13:43 2018
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Subject: [Bug c++/84281] Heap grows indefinitely
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
As said, fixed.
>From gcc-bugs-return-596317-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 08:31:50 2018
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Subject: [Bug target/84719] gcc's __builtin_memcpy performance with certain number of bytes is terrible compared to clang's
Date: Tue, 06 Mar 2018 08:31:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
So with 2 bytes we get
.L3:
movzwl (%rax), %edx
addq $3, %rax
movw %dx, 8(%rsp)
movq 8(%rsp), %rdx
imulq %rcx, %rdx
shrq $48, %rdx
addq %rdx, %rsi
cmpq %rdi, %rax
jne .L3
while with 3 bytes we see
.L3:
movzwl (%rax), %edx
addq $3, %rax
movw %dx, 8(%rsp)
movzbl -1(%rax), %edx
movb %dl, 10(%rsp)
movq 8(%rsp), %rdx
imulq %rcx, %rdx
shrq $48, %rdx
addq %rdx, %rsi
cmpq %rdi, %rax
jne .L3
while clang outputs
.LBB0_3: # =>This Inner Loop Header: Depth=1
movzwl (%r14,%rcx), %edx
movzbl 2(%r14,%rcx), %edi
shlq $16, %rdi
orq %rdx, %rdi
andq $-16777216, %rbx # imm = 0xFFFFFFFFFF000000
orq %rdi, %rbx
movq %rbx, %rdx
imulq %rax, %rdx
shrq $48, %rdx
addq %rdx, %rsi
addq $3, %rcx
cmpq $999999992, %rcx # imm = 0x3B9AC9F8
jb .LBB0_3
that _looks_ slower. Are you sure performance isn't dominated by the
first init loop (both GCC and clang vectorize it). I notice we spill
in the above loop for the bitfield insert where clang uses register
operations. We refuse to inline the memcpy at the GIMPLE level
and further refuse to optimzie it to a BIT_INSERT_EXPR which would
be a possibility.
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Subject: [Bug c/84721] [8 Regression] ICE in c_push_function_context, at c-decl.c:9667
Date: Tue, 06 Mar 2018 08:32:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
CC| |aoliva at gcc dot gnu.org
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Subject: [Bug c++/84720] [7/8 Regression] internal compiler error: tree check: expected tree that contains 'decl minimal' structure, have 'error_mark' in decl_anon_ns_mem_p, at cp/tree.c:3472
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Priority|P3 |P2
Target Milestone|--- |7.4
Summary|internal compiler error: |[7/8 Regression] internal
|tree check: expected tree |compiler error: tree check:
|that contains 'decl |expected tree that contains
|minimal' structure, have |'decl minimal' structure,
|'error_mark' in |have 'error_mark' in
|decl_anon_ns_mem_p, at |decl_anon_ns_mem_p, at
|cp/tree.c:3472 |cp/tree.c:3472
>From gcc-bugs-return-596321-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 08:33:59 2018
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Subject: [Bug middle-end/84723] [8 Regression] ICE in create_target_clone, at multiple_target.c:275
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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>From gcc-bugs-return-596320-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 08:33:29 2018
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Subject: [Bug middle-end/84722] [8 Regression] ICE in create_dispatcher_calls, at multiple_target.c:147
Date: Tue, 06 Mar 2018 08:33:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-596322-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 08:36:27 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84724] [7/8 Regression] internal compiler error: in single_succ_edge, at basic-block.h:339 with a declaration of __builtin_trap
Date: Tue, 06 Mar 2018 08:36:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Yeah. Or rather the FEs shouldn't clobber the builtin decls (_not_ merge into
them) so that when the ME looks up decls for them they never pick up user
decls.
Similar issues for builtin folding if the folded-to builtin is misdeclared.
>From gcc-bugs-return-596323-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 08:38:52 2018
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Subject: [Bug c++/84727] [8 regression] Constant class initialization not detected as such
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-596324-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 08:43:25 2018
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Subject: [Bug c++/84727] [8 regression] Constant class initialization not detected as such
Date: Tue, 06 Mar 2018 08:43:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Yeah, already fixed by my r258116.
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Subject: [Bug middle-end/84722] [8 Regression] ICE in create_dispatcher_calls, at multiple_target.c:147
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-03-06
CC| |marxin at gcc dot gnu.org
Known to work| |7.3.0
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r249365, thus mine.
>From gcc-bugs-return-596326-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 08:46:17 2018
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Subject: [Bug c++/84729] internal compiler error: verify_gimple failed
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with GCC 4.7.0.
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Subject: [Bug target/84719] gcc's __builtin_memcpy performance with certain number of bytes is terrible compared to clang's
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--- Comment #10 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #9)
> So with 2 bytes we get
Try 3 bytes (the worst case).
> Are you sure performance isn't dominated by the
> first init loop (both GCC and clang vectorize it).
Replacing memcpy(,,block) with memcpy(,,8) (the next line masks the other bytes
anyway) gained a factor 8 in running time, when I tried the other day.
>From gcc-bugs-return-596329-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 08:50:51 2018
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Subject: [Bug c++/84729] [6/7/8 Regression] internal compiler error: verify_gimple failed
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |6.5
Summary|internal compiler error: |[6/7/8 Regression] internal
|verify_gimple failed |compiler error:
| |verify_gimple failed
>From gcc-bugs-return-596328-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 08:50:18 2018
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Subject: [Bug c++/84729] internal compiler error: verify_gimple failed
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Probably started with r175674.
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Subject: [Bug c++/84720] [7/8 Regression] internal compiler error: tree check: expected tree that contains 'decl minimal' structure, have 'error_mark' in decl_anon_ns_mem_p, at cp/tree.c:3472
Date: Tue, 06 Mar 2018 08:51:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-06
CC| |jason at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
Known to work| |6.4.0
Ever confirmed|0 |1
Known to fail| |7.3.0, 8.0
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r241425.
>From gcc-bugs-return-596331-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 08:52:49 2018
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Subject: [Bug c++/84728] internal compiler error: Segmentation fault (is_gimple_variable())
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, all releases I have do ICE (4.6.0+).
>From gcc-bugs-return-596332-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 09:23:39 2018
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Subject: [Bug tree-optimization/83325] Compile time hog w/ -Os -fwrapv
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|powerpc-linux |x86_64-*-*
Last reconfirmed|2017-12-08 00:00:00 |2018-3-6
Version|8.0 |7.3.1
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Re-confirmed on the GCC 7 branch for x86_64-linux, on trunk powerpc it no
longer reproduces. I will try to isolate a GIMPLE testcase now...
>From gcc-bugs-return-596333-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 09:26:48 2018
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Subject: [Bug inline-asm/84683] [6/7/8 Regression] internal compiler error: in move_for_stack_reg, at reg-stack.c:1173
Date: Tue, 06 Mar 2018 09:26:00 -0000
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Mar 6 09:23:36 2018
New Revision: 258273
URL: https://gcc.gnu.org/viewcvs?rev=258273&root=gcc&view=rev
Log:
PR inline-asm/84683
* reg-stack.c (move_for_stack_reg): If any_malformed_asm, avoid
assertion failure.
* g++.dg/ext/pr84683.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/ext/pr84683.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/reg-stack.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-596334-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 09:43:19 2018
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Subject: [Bug target/84710] [8 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1896 with -O -fno-forward-propagate
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--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Well, yuck, I missed that part of rtl.texi (or somehow I thought this RTL would
be refused earlier).
Please use reg_or_subregno in the patch though?
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Subject: [Bug target/84710] [8 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1896 with -O -fno-forward-propagate
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--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
The testcase does not crash for me; does it need more non-default options?
The testcase has UB of course (d is undefined).
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Subject: [Bug target/84710] [8 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1896 with -O -fno-forward-propagate
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Segher Boessenkool from comment #4)
> The testcase does not crash for me; does it need more non-default options?
>
> The testcase has UB of course (d is undefined).
The compiler needs to be configured with --enable-checking=yes,rtl .
--- gcc/combine.c.jj 2018-03-05 23:13:26.478215559 +0100
+++ gcc/combine.c 2018-03-06 08:50:17.756288841 +0100
@@ -4283,12 +4283,8 @@ try_combine (rtx_insn *i3, rtx_insn *i2,
if (GET_CODE (x) == PARALLEL)
x = XVECEXP (newi2pat, 0, 0);
- /* It can only be a SET of a REG or of a paradoxical SUBREG of a REG.
*/
- x = SET_DEST (x);
- if (paradoxical_subreg_p (x))
- x = SUBREG_REG (x);
-
- unsigned int regno = REGNO (x);
+ /* It can only be a SET of a REG or of a SUBREG of a REG. */
+ unsigned int regno = reg_or_subregno (SET_DEST (x));
bool done = false;
for (rtx_insn *insn = NEXT_INSN (i3);
is the combine.c part I'll be testing. And, the testcase is dg-do compile
only,
so it doesn't matter if there is UB in it or not, we shouldn't ICE on it (and
yes, my attempts to get rid of the uninit use just resulted in the ICE no
longer happening).
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Subject: [Bug c/84607] [6/7 Regression] Side effects discarded in address computation inside 'if'
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84607
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Mar 6 10:01:52 2018
New Revision: 258274
URL: https://gcc.gnu.org/viewcvs?rev=258274&root=gcc&view=rev
Log:
2018-03-06 Richard Biener <rguenther@suse.de>
Backport from mainline
2018-03-05 Richard Biener <rguenther@suse.de>
PR tree-optimization/84486
* tree-ssa-pre.c (create_expression_by_pieces): Remove dead code.
When inserting a __builtin_assume_aligned call set the LHS
SSA name alignment info accordingly.
2018-02-28 Richard Biener <rguenther@suse.de>
PR middle-end/84607
* genmatch.c (capture_info::walk_match): Do not mark
captured expressions without operands as expr_p given
they act more like predicates and should be subject to
"lost tail" side-effect preserving.
* gcc.dg/pr84607.c: New testcase.
Added:
branches/gcc-7-branch/gcc/testsuite/gcc.dg/pr84607.c
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/genmatch.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
branches/gcc-7-branch/gcc/tree-ssa-pre.c
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Subject: [Bug tree-optimization/84486] [7 Regression] code hoisting removes alignment assumption
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--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Mar 6 10:01:52 2018
New Revision: 258274
URL: https://gcc.gnu.org/viewcvs?rev=258274&root=gcc&view=rev
Log:
2018-03-06 Richard Biener <rguenther@suse.de>
Backport from mainline
2018-03-05 Richard Biener <rguenther@suse.de>
PR tree-optimization/84486
* tree-ssa-pre.c (create_expression_by_pieces): Remove dead code.
When inserting a __builtin_assume_aligned call set the LHS
SSA name alignment info accordingly.
2018-02-28 Richard Biener <rguenther@suse.de>
PR middle-end/84607
* genmatch.c (capture_info::walk_match): Do not mark
captured expressions without operands as expr_p given
they act more like predicates and should be subject to
"lost tail" side-effect preserving.
* gcc.dg/pr84607.c: New testcase.
Added:
branches/gcc-7-branch/gcc/testsuite/gcc.dg/pr84607.c
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/genmatch.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
branches/gcc-7-branch/gcc/tree-ssa-pre.c
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Subject: [Bug c/84721] [8 Regression] ICE in c_push_function_context, at c-decl.c:9667
Date: Tue, 06 Mar 2018 10:02:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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CC| |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The C FE uses building_stmt_list_p predicate in multiple spots, and that
doesn't really work well if we've already pushed a DEBUG_BEGIN_STMT into some
STATEMENT_LIST.
I have an untested patch.
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Subject: [Bug target/84710] [8 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1896 with -O -fno-forward-propagate
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--- Comment #6 from Zdenek Sojka <zsojka at seznam dot cz> ---
(In reply to Segher Boessenkool from comment #4)
> The testcase has UB of course (d is undefined).
The original testcase had defined behavior. The uninitialized use is the result
of delta/creduce reduction. There was an ICE with the unreduced testcase as
well.
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Subject: [Bug target/84710] [8 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1896 with -O -fno-forward-propagate
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--- Comment #7 from Zdenek Sojka <zsojka at seznam dot cz> ---
Created attachment 43573
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43573&action=edit
original testcase
Unreduced testcase; needs additional -fkeep-inline-functions:
$ aarch64-unknown-linux-gnu-gcc -O -fno-forward-propagate
-fkeep-inline-functions xxx.c -w
during RTL pass: combine
xxx.c: In function 'bar2':
xxx.c:81:1: internal compiler error: RTL check: expected code 'reg', have
'subreg' in rhs_regno, at rtl.h:1896
}
...
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Subject: [Bug c/84721] [8 Regression] ICE in c_push_function_context, at c-decl.c:9667
Date: Tue, 06 Mar 2018 10:09:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43574
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43574&action=edit
gcc8-pr84721.patch
Untested fix. Besides fixing this PR, I think it is plain wrong to add the
DEBUG_BEGIN_STMTs somewhere at the file scope, they are necessarily tied to
functions, so it makes only sense to emit them inside of functions.
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Subject: [Bug tree-optimization/84486] [7 Regression] code hoisting removes alignment assumption
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-596344-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 10:18:23 2018
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Subject: [Bug target/84710] [8 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1896 with -O -fno-forward-propagate
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--- Comment #8 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Ah right, I had checking disabled. Need more coffee I guess.
The insns I see are different:
Trying 19, 20 -> 21:
19: r106:SI#0=0
20: r108:SI=zero_extend(r106:SI#0)
21: r109:SI=r108:SI 0>>0x8
REG_DEAD r108:SI
(see insn 20); maybe the i3 in #c1 is already modified?
The #c5 patch is okay for trunk, thanks!
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Subject: [Bug target/84710] [8 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1896 with -O -fno-forward-propagate
Date: Tue, 06 Mar 2018 10:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84710
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Segher Boessenkool from comment #8)
> Ah right, I had checking disabled. Need more coffee I guess.
You don't really need to build the checking compiler for this though, it is
enough to put a breakpoint on that REGNO (x) line and debug_rtx (x) first.
> The insns I see are different:
>
> Trying 19, 20 -> 21:
> 19: r106:SI#0=0
> 20: r108:SI=zero_extend(r106:SI#0)
> 21: r109:SI=r108:SI 0>>0x8
> REG_DEAD r108:SI
>
> (see insn 20); maybe the i3 in #c1 is already modified?
Likely, yes. I've just done up and debug_rtx on the 3 insns passed to
try_combine.
> The #c5 patch is okay for trunk, thanks!
Thanks.
>From gcc-bugs-return-596346-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 10:25:28 2018
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/84723] [8 Regression] ICE in create_target_clone, at multiple_target.c:275
Date: Tue, 06 Mar 2018 10:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84723
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
There are other reasons why versioning is forbidden, e.g.
__attribute__((target_clones ("avx", "default")))
void
foo (void)
{
static void *p = &&lab;
asm volatile ("" : "+m" (p) : : "memory");
lab:;
}
and
__attribute__((target_clones ("avx", "default")))
int
foo (int x)
{
__label__ lab;
__attribute__((noinline)) void bar () { goto lab; }
if (x == 5)
bar ();
x++;
lab:;
return x;
}
ICE too, even when they don't have any extra attributes. So the target clones
code needs to cope with those in any case.
>From gcc-bugs-return-596347-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 10:35:15 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83325] Compile time hog w/ -Os -fwrapv
Date: Tue, 06 Mar 2018 10:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83325
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Got distracted by analysis... we don't do anything "wrong" but hit the latent
issue that we're allowing x_1 -> y_3 lattice transitions. Those are
unfortunately required by the redundant IV removal testcases
tree-ssa/pr19590.c and tree-ssa/ssa-sccvn-{1,2,4}.c who all are very similar.
Index: gcc/tree-ssa-sccvn.c
===================================================================
--- gcc/tree-ssa-sccvn.c (revision 258272)
+++ gcc/tree-ssa-sccvn.c (working copy)
@@ -3283,6 +3283,20 @@ set_ssa_val_to (tree from, tree to)
&& (to == from || SSA_VAL (to) == to))
|| is_gimple_min_invariant (to)));
+ bool changed = false;
+ if (currval != to
+ && !operand_equal_p (currval, to, 0)
+ /* ??? For addresses involving volatile objects or types
operand_equal_p
+ does not reliably detect ADDR_EXPRs as equal. We know we are only
+ getting invariant gimple addresses here, so can use
+ get_addr_base_and_unit_offset to do this comparison. */
+ && !(TREE_CODE (currval) == ADDR_EXPR
+ && TREE_CODE (to) == ADDR_EXPR
+ && (get_addr_base_and_unit_offset (TREE_OPERAND (currval, 0), &coff)
+ == get_addr_base_and_unit_offset (TREE_OPERAND (to, 0), &toff))
+ && coff == toff))
+ changed = true;
+
if (from != to)
{
if (currval == from)
@@ -3297,9 +3311,10 @@ set_ssa_val_to (tree from, tree to)
}
return false;
}
- else if (currval != VN_TOP
- && ! is_gimple_min_invariant (currval)
- && is_gimple_min_invariant (to))
+ else if (changed
+ && currval != VN_TOP
+ && !(is_gimple_min_invariant (currval)
+ && !is_gimple_min_invariant (to)))
{
if (dump_file && (dump_flags & TDF_DETAILS))
{
@@ -3308,9 +3323,9 @@ set_ssa_val_to (tree from, tree to)
print_generic_expr (dump_file, from, 0);
fprintf (dump_file, " from ");
print_generic_expr (dump_file, currval, 0);
- fprintf (dump_file, " (non-constant) to ");
+ fprintf (dump_file, " to ");
print_generic_expr (dump_file, to, 0);
- fprintf (dump_file, " (constant)\n");
+ fprintf (dump_file, "\n");
}
to = from;
}
@@ -3327,17 +3342,7 @@ set_ssa_val_to (tree from, tree to)
print_generic_expr (dump_file, to, 0);
}
- if (currval != to
- && !operand_equal_p (currval, to, 0)
- /* ??? For addresses involving volatile objects or types
operand_equal_p
- does not reliably detect ADDR_EXPRs as equal. We know we are only
- getting invariant gimple addresses here, so can use
- get_addr_base_and_unit_offset to do this comparison. */
- && !(TREE_CODE (currval) == ADDR_EXPR
- && TREE_CODE (to) == ADDR_EXPR
- && (get_addr_base_and_unit_offset (TREE_OPERAND (currval, 0), &coff)
- == get_addr_base_and_unit_offset (TREE_OPERAND (to, 0), &toff))
- && coff == toff))
+ if (changed)
{
/* If we equate two SSA names we have to make the side-band info
of the leader conservative (and remember whatever original value
>From gcc-bugs-return-596348-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 10:43:39 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84730] New: internal compiler error: Segmentation fault (build_class_member_access_expr)
Date: Tue, 06 Mar 2018 10:43:00 -0000
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Bug ID: 84730
Summary: internal compiler error: Segmentation fault
(build_class_member_access_expr)
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Keywords: ice-on-invalid-code
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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CC: webrown.cpp at gmail dot com
Target Milestone: ---
Input:
struct {
int a;
struct {
int b = decltype(b);
int a;
};
};
Output:
$ xgcc -x c++ -S -
<stdin>:5:9: error: 'int <unnamed struct>::<unnamed struct>::a' conflicts with
a previous declaration
<stdin>:2:7: note: previous declaration 'int <unnamed struct>::a'
<stdin>:4:22: internal compiler error: Segmentation fault
0x3152ce9 crash_signal
/home/vegard/git/gcc/gcc/toplev.c:325
0x1409270 build_class_member_access_expr(cp_expr, tree_node*, tree_node*, bool,
int)
/home/vegard/git/gcc/gcc/cp/typeck.c:2408
0x140a55a build_class_member_access_expr(cp_expr, tree_node*, tree_node*, bool,
int)
/home/vegard/git/gcc/gcc/cp/typeck.c:2501
0x12a9da1 finish_non_static_data_member(tree_node*, tree_node*, tree_node*)
/home/vegard/git/gcc/gcc/cp/semantics.c:1860
0x12aec62 finish_id_expression(tree_node*, tree_node*, tree_node*, cp_id_kind*,
bool, bool, bool*, bool, bool, bool, bool, char const**, unsigned int)
/home/vegard/git/gcc/gcc/cp/semantics.c:3726
0xf7b055 cp_parser_decltype_expr
/home/vegard/git/gcc/gcc/cp/parser.c:14001
0xf7b055 cp_parser_decltype
/home/vegard/git/gcc/gcc/cp/parser.c:14135
0xf2db37 cp_parser_simple_type_specifier
/home/vegard/git/gcc/gcc/cp/parser.c:17065
0xf76736 cp_parser_postfix_expression
/home/vegard/git/gcc/gcc/cp/parser.c:6951
0xf2a4b7 cp_parser_unary_expression
/home/vegard/git/gcc/gcc/cp/parser.c:8322
0xebfeca cp_parser_cast_expression
/home/vegard/git/gcc/gcc/cp/parser.c:9090
0xec24f6 cp_parser_binary_expression
/home/vegard/git/gcc/gcc/cp/parser.c:9191
0xec62ca cp_parser_assignment_expression
/home/vegard/git/gcc/gcc/cp/parser.c:9486
0xecc0a3 cp_parser_constant_expression
/home/vegard/git/gcc/gcc/cp/parser.c:9770
0xed334e cp_parser_initializer_clause
/home/vegard/git/gcc/gcc/cp/parser.c:21916
0xedc293 cp_parser_initializer
/home/vegard/git/gcc/gcc/cp/parser.c:21856
0xedc4d1 cp_parser_late_parse_one_default_arg
/home/vegard/git/gcc/gcc/cp/parser.c:27761
0xf15be0 cp_parser_late_parsing_nsdmi
/home/vegard/git/gcc/gcc/cp/parser.c:27813
0xf15be0 cp_parser_class_specifier_1
/home/vegard/git/gcc/gcc/cp/parser.c:22715
0xf231cb cp_parser_class_specifier
/home/vegard/git/gcc/gcc/cp/parser.c:22768
$ xgcc --version
xgcc (GCC) 8.0.1 20180306 (experimental)
Built from git 11a93d7a09b871b3b9a2eb108eb91ad83d94e070 (r258271).
7.3.0 gives:
<source>:5:9: error: redeclaration of 'int <unnamed struct>::<unnamed
struct>::a'
int a;
^
<source>:2:7: note: previous declaration 'int <unnamed struct>::a'
int a;
^
<source>:4: confused by earlier errors, bailing out
Compiler returned: 1
Test case was minimised by C-Reduce.
>From gcc-bugs-return-596349-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 10:48:41 2018
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Subject: [Bug c++/84730] internal compiler error: Segmentation fault (build_class_member_access_expr)
Date: Tue, 06 Mar 2018 10:48:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-06
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed, even 4.7 ICEs.
>From gcc-bugs-return-596350-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 11:10:44 2018
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Subject: [Bug inline-asm/71572] ICE with VLA and "+g" inline-asm in force_constant_size, at gimplify.c:671
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Vegard Nossum <vegard.nossum at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |vegard.nossum at gmail dot com
--- Comment #3 from Vegard Nossum <vegard.nossum at gmail dot com> ---
FWIW this still ICEs on latest trunk (r258271) for me. It also reproduces using
"+r" instead of "+g".
An alternative test case (which is admittedly invalid code) is:
void f() {
int a[0 / 0];
asm("" : "+r" (a));
}
>From gcc-bugs-return-596351-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 11:12:33 2018
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Subject: [Bug driver/84731] New: -Bsymbolic switch ignored
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84731
Bug ID: 84731
Summary: -Bsymbolic switch ignored
Product: gcc
Version: 7.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
Assignee: unassigned at gcc dot gnu.org
Reporter: stsp at users dot sourceforge.net
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-Bsymbolic option is ignored by gcc.
-Wl,-Bsymbolic works correctly.
-Bsymbolic should either be rejected, or
passed to the linker, but not ignored.
>From gcc-bugs-return-596352-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 11:18:17 2018
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Subject: [Bug middle-end/84723] [8 Regression] ICE in create_target_clone, at multiple_target.c:275
Date: Tue, 06 Mar 2018 11:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84723
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43575
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43575&action=edit
gcc8-pr84723.patch
Untested fix.
>From gcc-bugs-return-596353-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 11:19:04 2018
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Subject: [Bug driver/84731] -Bsymbolic switch ignored
Date: Tue, 06 Mar 2018 11:19:00 -0000
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Andreas Schwab <schwab@linux-m68k.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
It is not ignored, it has a differnt meaning.
-B <directory> Add <directory> to the compiler's search paths
>From gcc-bugs-return-596354-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 11:21:11 2018
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Subject: [Bug inline-asm/84683] [6/7 Regression] internal compiler error: in move_for_stack_reg, at reg-stack.c:1173
Date: Tue, 06 Mar 2018 11:21:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[6/7/8 Regression] internal |[6/7 Regression] internal
|compiler error: in |compiler error: in
|move_for_stack_reg, at |move_for_stack_reg, at
|reg-stack.c:1173 |reg-stack.c:1173
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed for 8.1+ so far.
>From gcc-bugs-return-596355-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 11:25:11 2018
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/71832] [7/8 Regression] ICE on invalid C++11 code with incorrect decltype use for non-type template parameter: Segmentation fault
Date: Tue, 06 Mar 2018 11:25:00 -0000
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--- Comment #7 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Skipping completely the body works for this testcase, isn't that difficult to
do, but goes too far, the template completely disappears and we end up with bad
error recovery for anything referring to it afterwards. Probably, a better
approximation would be skipping the *instantiations* of the body.
>From gcc-bugs-return-596356-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 11:32:55 2018
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From: "gpnuma at centaurean dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/84719] gcc's __builtin_memcpy performance with certain number of bytes is terrible compared to clang's
Date: Tue, 06 Mar 2018 11:32:00 -0000
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--- Comment #11 from gpnuma at centaurean dot com ---
Yes it's not the init loop the problem. Just to make sure, with the following
code :
#include <sys/stat.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
int main(int argc, char *argv[]) {
const uint64_t size = 1000000000;
const size_t alloc_mem = size * sizeof(uint8_t);
uint8_t *mem = malloc(alloc_mem);
// for (uint_fast64_t i = 0; i < size; i++)
// mem[i] = (uint8_t) (i >> 7);
uint_fast64_t counter = 0;
uint64_t total = 0x123456789abcdefllu;
uint64_t receiver = 0;
printf("%u ...\n", 3);
counter = 0;
while (counter < size - 8) {
__builtin_memcpy(&receiver, &mem[counter], 3);
// receiver &= (0xffffffffffffffffllu >> (64 - ((3) << 3)));
total += ((receiver * 0x321654987cbafedllu) >> 48);
counter += 3;
}
printf("=> %llu\n", total);
return EXIT_SUCCESS;
}
The result is (the calculated sum is unreliable since we do not init memory) :
gcc
3 ...
=> 81985529216486895
real 0m3.180s
user 0m2.822s
sys 0m0.328s
clang
time ./a.out
3 ...
=> 81985529216486895
real 0m0.972s
user 0m0.621s
sys 0m0.338s
Still 4x faster
(In reply to Richard Biener from comment #9)
> So with 2 bytes we get
>
> .L3:
> movzwl (%rax), %edx
> addq $3, %rax
> movw %dx, 8(%rsp)
> movq 8(%rsp), %rdx
> imulq %rcx, %rdx
> shrq $48, %rdx
> addq %rdx, %rsi
> cmpq %rdi, %rax
> jne .L3
>
> while with 3 bytes we see
>
> .L3:
> movzwl (%rax), %edx
> addq $3, %rax
> movw %dx, 8(%rsp)
> movzbl -1(%rax), %edx
> movb %dl, 10(%rsp)
> movq 8(%rsp), %rdx
> imulq %rcx, %rdx
> shrq $48, %rdx
> addq %rdx, %rsi
> cmpq %rdi, %rax
> jne .L3
>
> while clang outputs
>
> .LBB0_3: # =>This Inner Loop Header: Depth=1
> movzwl (%r14,%rcx), %edx
> movzbl 2(%r14,%rcx), %edi
> shlq $16, %rdi
> orq %rdx, %rdi
> andq $-16777216, %rbx # imm = 0xFFFFFFFFFF000000
> orq %rdi, %rbx
> movq %rbx, %rdx
> imulq %rax, %rdx
> shrq $48, %rdx
> addq %rdx, %rsi
> addq $3, %rcx
> cmpq $999999992, %rcx # imm = 0x3B9AC9F8
> jb .LBB0_3
>
> that _looks_ slower. Are you sure performance isn't dominated by the
> first init loop (both GCC and clang vectorize it). I notice we spill
> in the above loop for the bitfield insert where clang uses register
> operations. We refuse to inline the memcpy at the GIMPLE level
> and further refuse to optimzie it to a BIT_INSERT_EXPR which would
> be a possibility.
>From gcc-bugs-return-596357-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 11:41:55 2018
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Subject: [Bug target/84521] [8 Regression] aarch64: Frame-pointer corruption with __builtin_setjmp/__builtin_longjmp and -fomit-frame-pointer
Date: Tue, 06 Mar 2018 11:41:00 -0000
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sudi at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
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Subject: [Bug c++/84724] [7/8 Regression] internal compiler error: in single_succ_edge, at basic-block.h:339 with a declaration of __builtin_trap
Date: Tue, 06 Mar 2018 11:55:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |jason at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The C FE has quite a lot of code in this case, e.g.
match_builtin_function_types, which the C++ FE doesn't seem to have, and indeed
the C FE leaves the __builtin_trap decl untouched after warning, while the C++
FE changes it.
The ICE in this case isn't caused by a mismatch between __builtin_trap ()
return type, but rather the lack of noreturn attribute on the new decl.
Though I'm sure that redefining similar way many other builtins that GCC emits
on its own or expects a particular arguments or return types will cause many
other ICEs.
>From gcc-bugs-return-596359-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 12:19:43 2018
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Subject: [Bug sanitizer/84732] New: false-positive -Wstringop-truncation warning with -fsanitize-coverage=trace-pc
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Bug ID: 84732
Summary: false-positive -Wstringop-truncation warning with
-fsanitize-coverage=trace-pc
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
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Created attachment 43576
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43576&action=edit
linux/drivers/staging/lustre/lnet/lnet/lib-socket.c, preprocessed, not reduced
I ran into this warning for what looks like correct code in the linux kernel
that we should not warn about:
$ aarch64-linux-gcc-8.0.1 -fno-strict-aliasing -Wno-pointer-sign
-fsanitize-coverage=trace-pc -Wall -O2 -c lib-socket.i
In file included from /git/arm-soc/arch/arm64/include/asm/processor.h:37,
from /git/arm-soc/arch/arm64/include/asm/spinlock.h:21,
from /git/arm-soc/include/linux/spinlock.h:88,
from /git/arm-soc/include/linux/wait.h:9,
from /git/arm-soc/include/linux/net.h:23,
from
/git/arm-soc/drivers/staging/lustre/lnet/lnet/lib-socket.c:37:
/git/arm-soc/drivers/staging/lustre/lnet/lnet/lib-socket.c: In function
'lnet_ipif_query':
/git/arm-soc/include/linux/string.h:254:9: warning: '__builtin_strncpy'
specified bound 16 equals destination size [-Wstringop-truncation]
return __builtin_strncpy(p, q, size);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/git/arm-soc/include/linux/string.h:254:9: warning: '__builtin_strncpy'
specified bound 16 equals destination size [-Wstringop-truncation]
return __builtin_strncpy(p, q, size);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/git/arm-soc/include/linux/string.h:254:9: warning: '__builtin_strncpy'
specified bound 16 equals destination size [-Wstringop-truncation]
return __builtin_strncpy(p, q, size);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
See
https://elixir.bootlin.com/linux/v4.15/source/drivers/staging/lustre/lnet/lnet/lib-socket.c#L99
for the original source code. Without -fsanitize-coverage=trace-pc, the
strlen() comparison is sufficient to avoid that warning, with
fsanitize=coverage=trace-pc, that logic fails:
if (strlen(name) > sizeof(ifr.ifr_name) - 1)
return -E2BIG;
strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
I can probably create a reduced test case if that helps.
>From gcc-bugs-return-596360-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 12:25:19 2018
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Subject: [Bug sanitizer/84732] false-positive -Wstringop-truncation warning with -fsanitize-coverage=trace-pc
Date: Tue, 06 Mar 2018 12:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84732
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-03-06
Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Let me take a look.
>From gcc-bugs-return-596361-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 12:30:52 2018
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Subject: [Bug c++/84720] [7/8 Regression] internal compiler error: tree check: expected tree that contains 'decl minimal' structure, have 'error_mark' in decl_anon_ns_mem_p, at cp/tree.c:3472
Date: Tue, 06 Mar 2018 12:30:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
clang++ accepts this.
In tsubst_function_decl we set DECL_CONTEXT to error_mark_node as that is what
12520 if (member && !closure)
12521 ctx = tsubst_aggr_type (ctx, args,
12522 complain, t, /*entering_scope=*/1);
returns (complain is tf_none), returning error_mark_node here if ctx is
error_mark_node doesn't help, it ICEs later on elsewhere.
>From gcc-bugs-return-596362-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 12:42:30 2018
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Subject: [Bug c++/71832] [7/8 Regression] ICE on invalid C++11 code with incorrect decltype use for non-type template parameter: Segmentation fault
Date: Tue, 06 Mar 2018 12:42:00 -0000
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--- Comment #8 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Another idea - which appears to work great! - is skipping the bodies of the
member function definitions. If everything goes well I'll send soon a draft
patch.
>From gcc-bugs-return-596363-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 12:48:55 2018
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Subject: [Bug rtl-optimization/84659] [8 Regression] ICE: Segmentation fault (stack overflow in bb_note) w/ selective scheduling
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-06
CC| |abel at gcc dot gnu.org,
| |amonakov at gcc dot gnu.org,
| |jakub at gcc dot gnu.org
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So, we have bb 5:
(code_label 29 65 30 5 4 (nil) [1 uses])
(note 30 29 32 5 [bb 5] NOTE_INSN_BASIC_BLOCK)
(insn 32 30 33 5 (set (mem:SI (reg/f:SI 125 [ _5 ]) [1 *_20+0 S4 A32])
(reg:SI 143)) "pr84659.c":7 503 {*movsi_internal1}
(expr_list:REG_DEAD (reg:SI 143)
(expr_list:REG_DEAD (reg/f:SI 125 [ _5 ])
(nil))))
(insn 33 32 34 5 (set (reg/f:SI 125 [ _5 ])
(mem/f:SI (reg/v/f:SI 129 [ x ]) [2 *x_10(D)+0 S4 A32])) "pr84659.c":4
503 {*movsi_internal1}
(nil))
(insn 34 33 36 5 (set (reg:SI 126 [ _6 ])
(mem:SI (reg/f:SI 125 [ _5 ]) [1 *_5+0 S4 A32])) "pr84659.c":4 503
{*movsi_internal1}
(nil))
(insn 36 34 64 5 (set (reg:CC 144)
(compare:CC (reg:SI 126 [ _6 ])
(const_int 0 [0]))) "pr84659.c":4 774 {*cmpsi_signed}
(nil))
(insn 64 36 37 5 (const_int -1 [0xffffffffffffffff]) "pr84659.c":7 -1
(nil))
(jump_insn 37 64 38 5 (set (pc)
(if_then_else (le (reg:CC 144)
(const_int 0 [0]))
(label_ref:SI 29)
(pc))) "pr84659.c":4 849 {*rs6000.md:12271}
(expr_list:REG_DEAD (reg:CC 144)
(int_list:REG_BR_PROB 955630228 (nil)))
-> 29)
with succs edges 5->5 and 5->6, and call compute_live_after_bb on that bb.
This in turn does:
3073 IOR_REG_SET (lv, compute_live (sel_bb_head (e->dest)));
where sel_bb_head is insn 32 above, but src is NULL there, BB_LV_SET_VALID_P
(bb) is false and so is INSN_LIVE_VALID_P in all the insns (32, 34, 36, 64 and
37).
This means we:
3124 temp = NEXT_INSN (insn);
3125 final = NEXT_INSN (BB_END (bb));
3126 while (temp != final && ! INSN_LIVE_VALID_P (temp))
3127 temp = NEXT_INSN (temp);
3128 if (temp == final)
3129 {
3130 lv = compute_live_after_bb (bb);
3131 temp = PREV_INSN (temp);
3132 }
temp == final == first insn of the following bb, and we recurse again into
compute_live_after_bb.
>From gcc-bugs-return-596364-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 12:51:54 2018
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Subject: [Bug rtl-optimization/84659] [6/7/8 Regression] ICE: Segmentation fault (stack overflow in bb_note) w/ selective scheduling
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Summary|[8 Regression] ICE: |[6/7/8 Regression] ICE:
|Segmentation fault (stack |Segmentation fault (stack
|overflow in bb_note) w/ |overflow in bb_note) w/
|selective scheduling |selective scheduling
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r211725 (though, that likely just made a latent sel-sched bug
reproducible).
>From gcc-bugs-return-596365-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 13:01:07 2018
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Subject: [Bug tree-optimization/84114] global reassociation pass prevents fma usage, generates slower code
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--- Comment #8 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to Steve Ellcey from comment #6)
> (In reply to Wilco from comment #5)
> > (In reply to Steve Ellcey from comment #4)
> > > While teaching the reassociation pass about fma's seems like the right
> > > answer would it be reasonable (and simpler) to do the fma pass
> > > (pass_optimize_widening_mul) before
> > > the reassociation pass (pass_reassoc) to get the most fma's?
> > >
> > > That fixes my small test case but I haven't done a bigger performance check
> > > to see what the overall impact would be.
> >
> > I don't know what else that would affect since the reassociation phase runs
> > very early - and it's late at this stage. My patch seems much safer. Even
> > easier might be to return 1 for FLOAT_MODE PLUS_EXPR in
> > aarch64_reassociation_width. Then we can fix the reassociation phase in GCC9.
>
> Moving the fma phase did not have a good performance impact (it was worse).
So it looks like it's best to teach the reassociation phase about FMA for GCC9.
> Your patch of setting the reassociation width to 1 did help performance on
> ThunderX2.
Can you let me know if my workaround helped? If useful I could backport it to
GCC7 as well.
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Subject: [Bug c++/53281] poor error message for calling a non-const method from a const object
Date: Tue, 06 Mar 2018 13:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53281
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Current trunk gives:
cv.cc: In member function ‘void Foo::bar2(const Foo&)’:
cv.cc:4:26: error: passing ‘const Foo’ as ‘this’ argument discards qualifiers
[-fpermissive]
foo.bar1();
^
cv.cc:2:14: note: in call to ‘void Foo::bar1()’
void bar1() {}
^~~~
With this patch:
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -7799,7 +7799,24 @@ build_over_call (struct z_candidate *cand, int flags,
tsubst_flags_t complain)
if (permerror (input_location, "passing %qT as %<this%> "
"argument discards qualifiers",
TREE_TYPE (argtype)))
- inform (DECL_SOURCE_LOCATION (fn), " in call to %qD", fn);
+ {
+ int argquals = cp_type_quals (TREE_TYPE (argtype));
+ int fnquals = cp_type_quals (TREE_TYPE (fn));
+ int discarded = argquals & ~fnquals;
+ bool non_const = discarded & TYPE_QUAL_CONST;
+ bool non_volatile = discarded & TYPE_QUAL_VOLATILE;
+ const char *descr;
+ if (non_const && non_volatile)
+ descr = " which is non-const and non-volatile";
+ else if (non_const)
+ descr = " which is non-const";
+ else if (non_volatile)
+ descr = " which is non-volatile";
+ else
+ descr = "";
+ inform (DECL_SOURCE_LOCATION (fn), " in call to %qD%s",
+ fn, descr);
+ }
}
else
return error_mark_node;
we get:
cv.cc: In member function ‘void Foo::bar2(const Foo&)’:
cv.cc:4:26: error: passing ‘const Foo’ as ‘this’ argument discards qualifiers
[-fpermissive]
foo.bar1();
^
cv.cc:2:14: note: in call to ‘void Foo::bar1()’ which is non-const
void bar1() {}
^~~~
Note the addition of "which is non-const" to the note.
>From gcc-bugs-return-596367-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 13:46:36 2018
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From: "vegard.nossum at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84733] New: internal compiler error: Segmentation fault (check_local_shadow())
Date: Tue, 06 Mar 2018 13:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84733
Bug ID: 84733
Summary: internal compiler error: Segmentation fault
(check_local_shadow())
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Keywords: ice-on-invalid-code
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vegard.nossum at gmail dot com
CC: webrown.cpp at gmail dot com
Target Milestone: ---
Input:
struct c {
~c();
} b;
void f() {
try {
d:
;
} catch (int) {
}
decltype(b) a;
int e;
struct e f;
}
Output:
$ xgcc -x c++ -S -
<stdin>:14:10: internal compiler error: Segmentation fault
0x3152ce9 crash_signal
/home/vegard/git/gcc/gcc/toplev.c:325
0xe47760 check_local_shadow
/home/vegard/git/gcc/gcc/cp/name-lookup.c:2683
0xe5b1b7 do_pushdecl
/home/vegard/git/gcc/gcc/cp/name-lookup.c:3086
0xe6030f pushdecl(tree_node*, bool)
/home/vegard/git/gcc/gcc/cp/name-lookup.c:3154
0xe6030f do_pushdecl_with_scope
/home/vegard/git/gcc/gcc/cp/name-lookup.c:3982
0xe62f98 do_pushtag
/home/vegard/git/gcc/gcc/cp/name-lookup.c:6444
0xe62f98 pushtag(tree_node*, tree_node*, tag_scope)
/home/vegard/git/gcc/gcc/cp/name-lookup.c:6514
0xb5f965 xref_tag_1
/home/vegard/git/gcc/gcc/cp/decl.c:13726
0xb5f965 xref_tag(tag_types, tree_node*, tag_scope, bool)
/home/vegard/git/gcc/gcc/cp/decl.c:13783
0xf8396d cp_parser_elaborated_type_specifier
/home/vegard/git/gcc/gcc/cp/parser.c:17918
0xf2265c cp_parser_type_specifier
/home/vegard/git/gcc/gcc/cp/parser.c:16802
0xf8858a cp_parser_decl_specifier_seq
/home/vegard/git/gcc/gcc/cp/parser.c:13629
0xfa3a70 cp_parser_simple_declaration
/home/vegard/git/gcc/gcc/cp/parser.c:12938
0xfab998 cp_parser_block_declaration
/home/vegard/git/gcc/gcc/cp/parser.c:12883
0xfade64 cp_parser_declaration_statement
/home/vegard/git/gcc/gcc/cp/parser.c:12476
0xefab2b cp_parser_statement
/home/vegard/git/gcc/gcc/cp/parser.c:10925
0xefe5eb cp_parser_statement_seq_opt
/home/vegard/git/gcc/gcc/cp/parser.c:11274
0xeff08a cp_parser_compound_statement
/home/vegard/git/gcc/gcc/cp/parser.c:11228
0xf9283b cp_parser_function_body
/home/vegard/git/gcc/gcc/cp/parser.c:21778
0xf9283b cp_parser_ctor_initializer_opt_and_function_body
/home/vegard/git/gcc/gcc/cp/parser.c:21813
$ xgcc --version
xgcc (GCC) 8.0.1 20180306 (experimental)
Built from git 11a93d7a09b871b3b9a2eb108eb91ad83d94e070 (r258271).
5.5.0 says:
<source>: In function 'void f()':
<source>:12:13: error: 'decltype' was not declared in this scope
decltype(b) a;
^
<source>:14:12: error: aggregate 'f()::e f' has incomplete type and cannot be
defined
struct e f;
^
Compiler returned: 1
Test case was minimised by C-Reduce.
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Subject: [Bug tree-optimization/68523] CFG Expansion Computes Incorrect Block Frequencies for Nested Loops
Date: Tue, 06 Mar 2018 13:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68523
Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
The constant loop is now completely optimised away before expand; use
-fno-loop-interchange to prevent that.
Even with that I see no problem any more now, maybe the new frequency
stuff changed this?
Resolving as fixed.
>From gcc-bugs-return-596369-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 13:56:34 2018
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Subject: [Bug c++/53281] poor error message for calling a non-const method from a const object
Date: Tue, 06 Mar 2018 13:56:00 -0000
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
FWIW Clang says:
cv.cc:4:17: error: member function 'bar1' not viable: 'this' argument has type
'const Foo', but function is not marked const
foo.bar1();
^~~
cv.cc:2:14: note: 'bar1' declared here
void bar1() {}
^
1 error generated.
And EDG says:
"cv.cc", line 4: error: the object has type qualifiers that are not compatible
with the member function
object type is: const Foo
foo.bar1();
^
1 error detected in the compilation of "cv.cc".
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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/84734] New: [8 Regression] Compiling gfortran.dg/size_kind_(2|3).f90 with -fdefault-integer-8 gives an ICE
Date: Tue, 06 Mar 2018 14:15:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84734
Bug ID: 84734
Summary: [8 Regression] Compiling
gfortran.dg/size_kind_(2|3).f90 with
-fdefault-integer-8 gives an ICE
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: dominiq at lps dot ens.fr
Target Milestone: ---
Compiling gfortran.dg/size_kind_(2|3).f90 with -fdefault-integer-8 gives an
ICE:
% gfc /opt/gcc/_clean/gcc/testsuite/gfortran.dg/size_kind_2.f90
-fdefault-integer-8
f951: internal compiler error: Segmentation fault: 11
The backtrace is
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS
(code=1, address=0x0)
frame #0: 0x0000000100002367 f951`::eval_intrinsic_f3(op=INTRINSIC_PLUS,
eval=(f951`::gfc_arith_plus(gfc_expr *, gfc_expr *, gfc_expr **) at
arith.c:614), op1=0x0000000000000000, op2=0x0000000000000000)(gfc_expr *,
gfc_expr *, gfc_expr **), gfc_expr *, gfc_expr *) at arith.c:1661
1658 static int
1659 gfc_zero_size_array (gfc_expr *e)
1660 {
-> 1661 if (e->expr_type != EXPR_ARRAY)
1662 return 0;
1663
1664 return e->value.constructor == NULL;
Target 0: (f951) stopped.
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS
(code=1, address=0x0)
* frame #0: 0x0000000100002367 f951`::eval_intrinsic_f3(op=INTRINSIC_PLUS,
eval=(f951`::gfc_arith_plus(gfc_expr *, gfc_expr *, gfc_expr **) at
arith.c:614), op1=0x0000000000000000, op2=0x0000000000000000)(gfc_expr *,
gfc_expr *, gfc_expr **), gfc_expr *, gfc_expr *) at arith.c:1661
frame #1: 0x000000010003cc13 f951`gfc_simplify_expr(p=0x00000001439187e0,
type=0) at expr.c:1133
frame #2: 0x0000000100029a4f f951`gfc_match_data_decl() at decl.c:2365
frame #3: 0x00000001000299d4 f951`gfc_match_data_decl()
frame #4: 0x000000010008e984 f951`::decode_statement() at parse.c:65
frame #5: 0x000000010008e97f f951`::decode_statement()
frame #6: 0x00000001000928b5 f951`::next_statement() at parse.c:1230
frame #7: 0x000000010009a05f f951`gfc_parse_file() at parse.c:6190
frame #8: 0x00000001000e661c f951`::gfc_be_parse_file() at f95-lang.c:204
frame #9: 0x0000000100c2f59a f951`::compile_file() at toplev.c:455
frame #10: 0x00000001012973eb f951`toplev::main(int, char**) at
toplev.c:2132
frame #11: 0x0000000101298f2e f951`main(argc=3, argv=0x00007ffeefbff220) at
main.c:39
The change occurred between revisions r257969 (2018-02-25, OK) and r258235
(2018-03-04, ICE).
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Subject: [Bug fortran/84734] [8 Regression] Compiling gfortran.dg/size_kind_(2|3).f90 with -fdefault-integer-8 gives an ICE
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84734
Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-06
Known to work| |6.4.0, 7.3.0
Blocks| |32770
Target Milestone|--- |8.0
Ever confirmed|0 |1
Known to fail| |8.0
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=32770
[Bug 32770] [Meta-bug] -fdefault-integer-8 issues
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Subject: [Bug fortran/84734] [8 Regression] Compiling gfortran.dg/size_kind_(2|3).f90 with -fdefault-integer-8 gives an ICE
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--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The following variant
integer(4) :: B(huge(1_4)+3_8,2_8)
integer(8) :: var1(2), var2, var3
print *, kind(B), size(B)
var1 = shape(B) ! { dg-error "SHAPE overflows its kind" }
print *, var1
var2 = size(B) ! { dg-error "SIZE overflows its kind" }
var3 = size(B,dim=1) ! { dg-error "SIZE overflows its kind" }
end
gives the expected errors when compiled without -fdefault-integer-8, but
compile with -fdefault-integer-8 and gives at run time
4 4294967300
2147483650 2
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Subject: [Bug c++/53281] poor error message for calling a non-const method from a const object
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
A further improvement might be to stop talking about "passing '...' as 'this'
argument" since that's a leaky abstraction: although member functions are
implemented with a hidden 'this' parameter, that's not how most C++ programmers
think of it, or how the abstract machine is described. Also, 'this' is a
pointer, and 'const Foo' is not a pointer type (Clang loses points there too).
So maybe this would be better:
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -7796,8 +7796,15 @@ build_over_call (struct z_candidate *cand, int flags,
tsubst_flags_t complain)
{
if (complain & tf_error)
{
- if (permerror (input_location, "passing %qT as %<this%> "
- "argument discards qualifiers",
+ int argquals = cp_type_quals (TREE_TYPE (argtype));
+ int fnquals = cp_type_quals (TREE_TYPE (fn));
+ int discarded = argquals & ~fnquals;
+ bool non_const = discarded & TYPE_QUAL_CONST;
+ bool non_volatile = discarded & TYPE_QUAL_VOLATILE;
+ if (permerror (input_location, "cannot call %s%s member "
+ "function on object of type %qT",
+ non_const ? "non-const" : "",
+ non_volatile ? "non-volatile" : "",
TREE_TYPE (argtype)))
inform (DECL_SOURCE_LOCATION (fn), " in call to %qD", fn);
}
cv.cc: In member function 'void Foo::bar2(const Foo&)':
cv.cc:4:26: error: cannot call non-const member function on object of type
'const Foo' [-fpermissive]
foo.bar1();
^
cv.cc:2:14: note: in call to 'void Foo::bar1()'
void bar1() {}
^~~~
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Subject: [Bug gcov-profile/84735] New: [8 Regression] Describe recent gcov data file format changes in gcov-io.h
Date: Tue, 06 Mar 2018 14:42:00 -0000
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Bug ID: 84735
Summary: [8 Regression] Describe recent gcov data file format
changes in gcov-io.h
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Brief Description of 'gcov' Data Files
in the manual says:
The full details of the file format is specified in 'gcov-io.h', and
functions provided in that header file should be used to access the
coverage files.
but the recent changes weren't documented in gcov-io.h.
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Subject: [Bug sanitizer/84732] false-positive -Wstringop-truncation warning with -fsanitize-coverage=trace-pc
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Reduced test-case:
$ cat ~/Programming/testcases/ice.i
char *arg;
struct buffer{
char a[16];
};
struct buffer a, b;
void e(void) {
if (__builtin_strlen(arg) > 1)
__builtin_strncpy(a.a, arg, sizeof(struct buffer));
}
Without coverage sanitization:
$ ./xgcc -B. ~/Programming/testcases/ice.i -c -O2 -Wall
-fdump-tree-strlen=/dev/stdout
;; Function e (e, funcdef_no=0, decl_uid=1962, cgraph_uid=0, symbol_order=3)
e ()
{
char * arg.0_1;
long unsigned int _2;
<bb 2> [local count: 1073741825]:
arg.0_1 = arg;
_2 = __builtin_strlen (arg.0_1);
if (_2 > 1)
goto <bb 3>; [41.48%]
else
goto <bb 4>; [58.52%]
<bb 3> [local count: 445388109]:
__builtin_strncpy (&a.a, arg.0_1, 16);
<bb 4> [local count: 1073741825]:
return;
}
With:
./xgcc -B. ~/Programming/testcases/ice.i -c -O2 -fsanitize-coverage=trace-pc
-fdump-tree-strlen=/dev/stdout
;; Function e (e, funcdef_no=0, decl_uid=2322, cgraph_uid=0, symbol_order=3)
e ()
{
char * arg.0_1;
long unsigned int _2;
<bb 2> [local count: 1073741825]:
__builtin___sanitizer_cov_trace_pc ();
arg.0_1 = arg;
_2 = __builtin_strlen (arg.0_1);
if (_2 > 1)
goto <bb 3>; [41.48%]
else
goto <bb 4>; [58.52%]
<bb 3> [local count: 445388109]:
__builtin___sanitizer_cov_trace_pc ();
__builtin_strncpy (&a.a, arg.0_1, 16);
<bb 4> [local count: 1073741825]:
__builtin___sanitizer_cov_trace_pc ();
return;
}
I guess it somehow confuses VRP, Martin can you please take a look? Note that
__builtin___sanitizer_cov_trace_pc is pure function, can't modify memory in
original program.
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-03-06
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Known to fail| |8.0
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Subject: [Bug c++/79937] [6/7/8 Regression] ICE in replace_placeholders_r
Date: Tue, 06 Mar 2018 14:52:00 -0000
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--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43577
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43577&action=edit
gcc8-pr79937.patch
My #c8 patch doesn't work at all, but this one at least fixes the two testcases
(but indeed doesn't fix one where bar returns X rather than C).
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Subject: [Bug tree-optimization/28364] poor optimization choices when iterating over a std::string (probably not c++-specific)
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CC| |amker at gcc dot gnu.org
--- Comment #32 from amker at gcc dot gnu.org ---
(In reply to bin.cheng from comment #31)
> This is a really old issue! I will also check status of this issue on trunk.
For multi-exit cases, I wonder if it's possible to only copy wrto the one
checking IV. It should still satisfy ch's purpose.
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Subject: [Bug c++/79937] [6/7/8 Regression] ICE in replace_placeholders_r
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--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
That said, I've tried:
--- gcc/cp/semantics.c.jj 2018-03-06 08:01:37.851883447 +0100
+++ gcc/cp/semantics.c 2018-03-06 15:19:27.685013764 +0100
@@ -2814,6 +2814,11 @@ finish_compound_literal (tree type, tree
if (!VECTOR_TYPE_P (type))
compound_literal = get_target_expr_sfinae (compound_literal, complain);
+ if (TREE_CODE (compound_literal) == TARGET_EXPR)
+ compound_literal
+ = replace_placeholders (compound_literal,
+ TARGET_EXPR_SLOT (compound_literal));
+
return compound_literal;
}
instead, but that fails miserably during gimplification, seems we optimize away
those TARGET_EXPRs at some point just to their TARGET_EXPR_INITIAL and
referring in that CONSTRUCTOR to the TARGET_EXPR_SLOT then doesn't really work.
The regression was introduced by the:
- case TARGET_EXPR:
- /* Don't mess with placeholders in an unrelated object. */
- *walk_subtrees = false;
- break;
replace_placeholders_r change, which makes me wonder if replace_placeholders
could somehow make a difference between TARGET_EXPRs it wants to walk into
(e.g. the TARGET_EXPR created in nsdmi-aggr3.C:
#0 make_node (code=TARGET_EXPR) at ../../gcc/tree.c:1056
#1 0x00000000015d4974 in build4 (code=TARGET_EXPR, tt=<record_type
0x7fffefd9fd20 A>, arg0=<var_decl 0x7fffefdbd360>,
arg1=<aggr_init_expr 0x7fffefdb4600>, arg2=<tree 0x0>, arg3=<tree 0x0>) at
../../gcc/tree.c:4797
#2 0x0000000000ace5e4 in build_target_expr (decl=<var_decl 0x7fffefdbd360>,
value=<aggr_init_expr 0x7fffefdb4600>, complain=3)
at ../../gcc/cp/tree.c:454
#3 0x0000000000acf39c in build_cplus_new (type=<record_type 0x7fffefd9fd20 A>,
init=<aggr_init_expr 0x7fffefdb4440>, complain=3)
at ../../gcc/cp/tree.c:631
#4 0x0000000000ad8b16 in bot_manip (tp=0x7fffffffc3c8,
walk_subtrees=0x7fffffffc37c, data=0x2dd3c80) at ../../gcc/cp/tree.c:2915
#5 0x00000000015f02f2 in walk_tree_1 (tp=0x7fffffffc3c8, func=0xad89ae
<bot_manip(tree*, int*, void*)>, data=0x2dd3c80, pset=0x0,
lh=0xae085b <cp_walk_subtrees(tree_node**, int*, tree_node*
(*)(tree_node**, int*, void*), void*, hash_set<tree_node*,
default_hash_traits<tree_node*> >*)>) at ../../gcc/tree.c:11400
#6 0x0000000000ad94e2 in break_out_target_exprs (t=<target_expr
0x7fffefc510a8>) at ../../gcc/cp/tree.c:3050
#7 0x000000000093e0f2 in get_nsdmi (member=<field_decl 0x7fffefd6dab0 a>,
in_ctor=false, complain=3) at ../../gcc/cp/init.c:637
and the TARGET_EXPRs created by finish_compound_literal by the testcase
included in the above patch or the:
// PR c++/79937
// { dg-do run { target c++14 } }
struct X {
unsigned i;
unsigned n = i;
unsigned m = i;
};
X
bar (X x)
{
if (x.i != 1 || x.n != 2 || x.m != 1)
__builtin_abort ();
return x;
}
int
main ()
{
X x = bar (X {1, X {2}.n});
if (x.i != 1 || x.n != 2 || x.m != 1)
__builtin_abort ();
}
E.g. could we walk into TARGET_EXPRs that have TARGET_EXPR_INITIAL
AGGR_INIT_EXPR, but avoid those that have TARGET_EXPR_INITIAL a CONSTRUCTOR, or
a CONSTRUCTOR with certain flags, or have some flags on TARGET_EXPRs?
Tried:
--- gcc/cp/tree.c.jj 2018-03-06 08:01:37.851883447 +0100
+++ gcc/cp/tree.c 2018-03-06 16:07:53.296061505 +0100
@@ -3165,6 +3165,13 @@ replace_placeholders_r (tree* t, int* wa
break;
}
+ case TARGET_EXPR:
+ /* Don't mess with placeholders in finish_compound_literal
+ created TARGET_EXPRs. */
+ if (TREE_CODE (TARGET_EXPR_INITIAL (*t)) == CONSTRUCTOR)
+ *walk_subtrees = false;
+ break;
+
default:
if (d->pset->add (*t))
*walk_subtrees = false;
but that FAILs nsdmi13.C, where the TARGET_EXPR is created by:
#4 0x00000000015c5ff9 in make_node (code=TARGET_EXPR) at ../../gcc/tree.c:1053
#5 0x00000000015d49ca in build4 (code=TARGET_EXPR, tt=<record_type
0x7fffefd9f9d8 A>, arg0=<var_decl 0x7fffefdb8480>,
arg1=<constructor 0x7fffefdb32b8>, arg2=<tree 0x0>, arg3=<tree 0x0>) at
../../gcc/tree.c:4797
#6 0x0000000000ace5e4 in build_target_expr (decl=<var_decl 0x7fffefdb8480>,
value=<constructor 0x7fffefdb32b8>, complain=3)
at ../../gcc/cp/tree.c:454
#7 0x0000000000acfaee in force_target_expr (type=<record_type 0x7fffefd9f9d8
A>, init=<constructor 0x7fffefdb32b8>, complain=3)
at ../../gcc/cp/tree.c:782
#8 0x0000000000acfa92 in build_target_expr_with_type (init=<constructor
0x7fffefdb32b8>, type=<record_type 0x7fffefd9f9d8 A>, complain=3)
at ../../gcc/cp/tree.c:766
#9 0x0000000000acfc0e in get_target_expr_sfinae (init=<constructor
0x7fffefdb32b8>, complain=3) at ../../gcc/cp/tree.c:797
#10 0x0000000000821df6 in convert_like_real (convs=0x2e5f280, expr=<constructor
0x7fffefdb32b8>, fn=<function_decl 0x7fffefdb6900 __ct_comp >,
argnum=0, issue_conversion_warnings=true, c_cast_p=false, complain=3) at
../../gcc/cp/call.c:6902
#11 0x0000000000821ede in convert_like_real (convs=0x2e5f2b0, expr=<constructor
0x7fffefdb32b8>, fn=<function_decl 0x7fffefdb6900 __ct_comp >,
argnum=0, issue_conversion_warnings=true, c_cast_p=false, complain=3) at
../../gcc/cp/call.c:6912
#12 0x0000000000826426 in build_over_call (cand=0x2e5f2e0, flags=1, complain=3)
at ../../gcc/cp/call.c:7945
#13 0x000000000082d3fb in build_new_method_call_1 (instance=<indirect_ref
0x7fffefdb2dc0>, fns=<overload 0x7fffefdb2940>,
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Subject: [Bug c++/79937] [6/7/8 Regression] ICE in replace_placeholders_r
Date: Tue, 06 Mar 2018 15:25:00 -0000
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--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The CONSTRUCTORS in TARGET_EXPR in the pr79937-{1,2,3}.C testcases have all
CONSTRUCTOR_IS_DIRECT_INIT and TREE_HAS_CONSTRUCTOR set, while nsdmi13.C
doesn't.
Does any of those matter?
In the nsdmi13.C case, there is just a single replace_placeholders call on the
whole testcase, so if we don't replace everything, we die during
gimplification,
but in pr79937-{1,2,3}.C the gimplification of the CONSTRUCTOR results in
cp_gimplify_init_expr and calls it there and handles the replacements that
aren't otherwise done.
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Subject: [Bug tree-optimization/84178] [7/8 Regression] ICE in release_bb_predicate
Date: Tue, 06 Mar 2018 15:29:00 -0000
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Subject: [Bug target/84280] [6/7/8 Regression] Performance regression in g++-7 with Eigen for non-AVX2 CPUs
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Subject: [Bug fortran/84394] [7/8 Regression] compiler error when using modules with derived types in block data subprograms
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Subject: [Bug c++/84611] [6/7/8 Regression] ICE in operator[], at vec.h:826 (local_class_index())
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Summary|[5/67/8 Regression] ICE in |[6/7/8 Regression] ICE in
|operator[], at vec.h:826 |operator[], at vec.h:826
|(local_class_index()) |(local_class_index())
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Subject: [Bug c++/84588] [8 Regression] internal compiler error: Segmentation fault (contains_struct_check())
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Subject: [Bug c++/84221] [6/7/8 Regression] spurious -Wunused warning on a variable of a template type declared unused
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Subject: [Bug c++/84222] [6/7/8 Regression] [[deprecated]] class complains about internal class usage
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Subject: [Bug lto/84241] [8 regression] test case g++.dg/torture/pr67600.C fails starting with r257412
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Subject: [Bug target/84719] gcc's __builtin_memcpy performance with certain number of bytes is terrible compared to clang's
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Manuel Lauss <manuel.lauss at googlemail dot com> changed:
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--- Comment #12 from Manuel Lauss <manuel.lauss at googlemail dot com> ---
clang-7 achieves an impressive level of ipc (amd zen):
Performance counter stats for './memtime-clangO2' (10 runs):
358,260795 task-clock:u (msec) # 0,999 CPUs utilized
( +- 1,43% )
0 context-switches:u # 0,000 K/sec
0 cpu-migrations:u # 0,000 K/sec
244.191 page-faults:u # 0,682 M/sec
( +- 0,00% )
1.253.573.425 cycles:u # 3,499 GHz
( +- 1,50% )
149.207.036 stalled-cycles-frontend:u # 11,90% frontend cycles
idle ( +- 2,04% )
333.373.414 stalled-cycles-backend:u # 26,59% backend cycles
idle ( +- 0,00% )
4.333.767.562 instructions:u # 3,46 insn per cycle
# 0,08 stalled cycles per
insn ( +- 0,00% )
333.621.304 branches:u # 931,225 M/sec
( +- 0,00% )
248.011 branch-misses:u # 0,07% of all branches
( +- 0,06% )
0,358644336 seconds time elapsed
( +- 1,43% )
compared to gcc-8 as of today:
Performance counter stats for './memtime-gcc8O2' (10 runs):
2087,357431 task-clock:u (msec) # 1,000 CPUs utilized
( +- 0,19% )
0 context-switches:u # 0,000 K/sec
0 cpu-migrations:u # 0,000 K/sec
244.191 page-faults:u # 0,117 M/sec
( +- 0,00% )
8.273.911.027 cycles:u # 3,964 GHz
( +- 0,00% )
3.691.281.142 stalled-cycles-frontend:u # 44,61% frontend cycles
idle ( +- 0,02% )
333.373.414 stalled-cycles-backend:u # 4,03% backend cycles
idle ( +- 0,00% )
3.667.101.412 instructions:u # 0,44 insn per cycle
# 1,01 stalled cycles per
insn ( +- 0,00% )
333.621.824 branches:u # 159,830 M/sec
( +- 0,00% )
248.423 branch-misses:u # 0,07% of all branches
( +- 0,01% )
2,088370519 seconds time elapsed
( +- 0,19% )
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Subject: [Bug target/84251] [8 Regression] Performance regression in gcc 8 when comparing floating point numbers
Date: Tue, 06 Mar 2018 15:38:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
So we changed wrong-code to missed-optimization. Sounds reasonable enough to
not make this P1.
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Subject: [Bug rtl-optimization/84345] [8 Regression] ICE: qsort checking failed (error: qsort comparator non-negative on sorted output: 1)
Date: Tue, 06 Mar 2018 15:39:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug target/84301] [6/7/8 Regression] ICE in create_pre_exit, at mode-switching.c:451
Date: Tue, 06 Mar 2018 15:39:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-596399-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 15:41:21 2018
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Subject: [Bug testsuite/84456] [8 regression] gcc.dg/guality/pr49888.c fail
Date: Tue, 06 Mar 2018 15:41:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
So it's a testsuite issue? Can somebody with a recent assembler verify with
-gno-whatever? Maybe we need a dg-require-effective-target locview?
>From gcc-bugs-return-596400-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 15:43:06 2018
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Subject: [Bug tree-optimization/84468] [8 Regression] bogus -Wstringop-truncation despite assignment after conditional strncpy
Date: Tue, 06 Mar 2018 15:43:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #16 from Richard Biener <rguenth at gcc dot gnu.org> ---
I still say simply walk to the next VDEF...
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Subject: [Bug debug/84550] [8 Regression] stepping through gcc does not work with gdb 8.0.1
Date: Tue, 06 Mar 2018 15:44:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Raising priority. A fix can be either in GCC or in gdb (we can just document a
new gdb requirement).
>From gcc-bugs-return-596402-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 15:44:48 2018
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Subject: [Bug tree-optimization/84552] [8 Regression] Compile time hog w/ -O2 -floop-nest-optimize -fno-tree-copy-prop -fno-tree-fre -fno-tree-loop-ivcanon
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug target/84565] [8 Regression] ICE in extract_insn, at recog.c:2304 on aarch64
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Subject: [Bug c++/84610] [6/7/8 Regression] ICE in synthesize_implicit_template_parm, at cp/parser.c:38843
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug tree-optimization/84650] [8 Regression] [graphite] ICE: Segmentation fault (in create_new_iv)
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug c++/84729] [6/7/8 Regression] internal compiler error: verify_gimple failed
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug tree-optimization/80511] [8 Regression] gcc.dg/Wstrict-overflow-18.c gcc.dg/Wstrict-overflow-7.c gcc.dg/pragma-diag-3.c
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug rtl-optimization/80791] [8 regression] test case gcc.dg/sms-1.c fail2 starting with r247885
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug c++/79937] [6/7/8 Regression] ICE in replace_placeholders_r
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--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43578
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43578&action=edit
gcc8-pr79937.patch
Actually, seems TREE_HAS_CONSTRUCTOR is set on a CONSTRUCTOR only by
finish_compound_literal. So if those are something we don't want to walk into
and everything else we do, then this patch might be it (passed make
check-c++-all, but otherwise untested).
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Subject: [Bug c++/81764] [6/7/8 Regression] Visibility attributes for explicitly instantiated template class get warned if it has been implicitly instantiated
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug target/81572] [7 Regression] gcc-7 regression: unnecessary vector regmove on compare
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--- Comment #7 from Peter Bergner <bergner at gcc dot gnu.org> ---
Author: bergner
Date: Tue Mar 6 15:54:30 2018
New Revision: 258280
URL: https://gcc.gnu.org/viewcvs?rev=258280&root=gcc&view=rev
Log:
gcc/
Backport from mainline
2018-02-22 Vladimir Makarov <vmakarov@redhat.com>
PR target/81572
* lra-int.h (LRA_UNKNOWN_ALT, LRA_NON_CLOBBERED_ALT): New macros.
* lra.c (lra_set_insn_recog_data, lra_update_insn_recog_data): Use
LRA_UNKNOWN_ALT.
* lra-constraints.c (curr_insn_transform): Set up
LRA_NON_CLOBBERED_ALT for moves processed on the fast path. Use
LRA_UNKNOWN_ALT.
(remove_inheritance_pseudos): Use LRA_UNKNOWN_ALT.
* lra-eliminations.c (spill_pseudos): Ditto.
(process_insn_for_elimination): Ditto.
* lra-lives.c (reg_early_clobber_p): Use the new macros.
* lra-spills.c (spill_pseudos): Use LRA_UNKNOWN_ALT and
LRA_NON_CLOBBERED_ALT.
gcc/testsuite/
Backport from mainline
2018-02-22 Vladimir Makarov <vmakarov@redhat.com>
PR target/81572
* gcc.target/powerpc/pr81572.c: New.
Added:
branches/gcc-7-branch/gcc/testsuite/gcc.target/powerpc/pr81572.c
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/lra-constraints.c
branches/gcc-7-branch/gcc/lra-eliminations.c
branches/gcc-7-branch/gcc/lra-int.h
branches/gcc-7-branch/gcc/lra-lives.c
branches/gcc-7-branch/gcc/lra-spills.c
branches/gcc-7-branch/gcc/lra.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
>From gcc-bugs-return-596413-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 16:02:59 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/84550] [8 Regression] stepping through gcc does not work with gdb 8.0.1
Date: Tue, 06 Mar 2018 16:02:00 -0000
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--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
My limited understanding is this is a GDB bug and that it basically never
worked properly with -freorder-blocks-and-partition. So not really sure how we
could work around it in GCC. Pedro, do you agree?
>From gcc-bugs-return-596412-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 16:02:20 2018
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Subject: [Bug target/81572] [7 Regression] gcc-7 regression: unnecessary vector regmove on compare
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Peter Bergner <bergner at gcc dot gnu.org> changed:
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--- Comment #8 from Peter Bergner <bergner at gcc dot gnu.org> ---
Backport testing was clean. Patch committed to the GCC 7 release branch.
Closing as fixed everywhere.
>From gcc-bugs-return-596414-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 16:33:11 2018
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Subject: [Bug c++/84736] New: When compiling with -g -O2 internal compiler error: in force_type_die, at dwarf2out.c:25111
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84736
Bug ID: 84736
Summary: When compiling with -g -O2 internal compiler error: in
force_type_die, at dwarf2out.c:25111
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: kuba.skowron at gmail dot com
Target Milestone: ---
Created attachment 43579
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43579&action=edit
Zipped first.ii file
There is internal compiler error when compiling with -g -O2 (ii file attached).
$ g++-7 -save-temps -Wall -g -O2 first.cpp
In file included from osd/OSD.cc:51:0:
osd/ReplicatedPG.h: In destructor ‘virtual
ReplicatedPG::WaitTrimTimer::WaitTrimTimer(boost::statechart::state<ReplicatedPG::WaitTrimTimer,
ReplicatedPG::Trimming>::my_context)::OnTimer::~OnTimer()’:
osd/ReplicatedPG.h:1667:14: internal compiler error: in force_type_die, at
dwarf2out.c:25111
struct OnTimer : Context {
^~~~~~~
0x8206ba force_type_die
../../src/gcc/dwarf2out.c:25111
0x82089b get_context_die
../../src/gcc/dwarf2out.c:25025
0x82089b force_decl_die
../../src/gcc/dwarf2out.c:25044
0x81ba47 gen_subprogram_die
../../src/gcc/dwarf2out.c:21905
0x816138 gen_decl_die
../../src/gcc/dwarf2out.c:25347
0x816e6e dwarf2out_decl
../../src/gcc/dwarf2out.c:25856
0x81cb42 dwarf2out_abstract_function
../../src/gcc/dwarf2out.c:21681
0xb46695 expand_call_inline
../../src/gcc/tree-inline.c:4887
0xb48084 gimple_expand_calls_inline
../../src/gcc/tree-inline.c:4917
0xb48084 optimize_inline_calls(tree_node*)
../../src/gcc/tree-inline.c:5057
0x113f6a9 early_inliner(function*)
../../src/gcc/ipa-inline.c:2721
$ g++-7 -v
Using built-in specs.
COLLECT_GCC=g++-7
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
7.2.0-1ubuntu1~16.04' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-7
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib
--with-target-system-zlib --enable-objc-gc=auto --enable-multiarch
--disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 7.2.0 (Ubuntu 7.2.0-1ubuntu1~16.04)
>From gcc-bugs-return-596415-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 16:35:07 2018
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From: "pthaugen at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/84737] New: 20% degradation in CPU2000 172.mgrid starting with r256888
Date: Tue, 06 Mar 2018 16:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84737
Bug ID: 84737
Summary: 20% degradation in CPU2000 172.mgrid starting with
r256888
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ipa
Assignee: unassigned at gcc dot gnu.org
Reporter: pthaugen at gcc dot gnu.org
CC: dje at gcc dot gnu.org, marxin at gcc dot gnu.org,
segher at gcc dot gnu.org, wschmidt at gcc dot gnu.org
Target Milestone: ---
Host: powerpc64-unknown-linux-gnu
Target: powerpc64-unknown-linux-gnu
Build: powerpc64-unknown-linux-gnu
I'm seeing a 20% degradation on 172.mgrid with r256888. Benchmark was built
with "-O3 -mcpu=power7 -ffast-math". Profiling shows the difference comes from
function resid() and its clone.
r256887
-------
Counted PM_RUN_CYC events (Run_cycles.) with a unit mask of 0x00 (No unit mask)
count 100000
samples % image name symbol name
658215 48.2563 mgrid_base.pat_test_64 .resid_
367381 26.9341 mgrid_base.pat_test_64 .psinv_
153587 11.2601 mgrid_base.pat_test_64 .interp_
109785 8.0488 mgrid_base.pat_test_64 .rprj3_
52642 3.8594 mgrid_base.pat_test_64 .comm3_
7912 0.5801 mgrid_base.pat_test_64 .MAIN__
3796 0.2783 libc-2.17.so .__memset_power8
r256888
-------
Counted PM_RUN_CYC events (Run_cycles.) with a unit mask of 0x00 (No unit mask)
count 100000
samples % image name symbol name
1109100 59.2023 mgrid_base.gcc_hunt_64 .resid_.constprop.1
368930 19.6930 mgrid_base.gcc_hunt_64 .psinv_
160102 8.5460 mgrid_base.gcc_hunt_64 .interp_
114954 6.1361 mgrid_base.gcc_hunt_64 .MAIN__
55253 2.9493 mgrid_base.gcc_hunt_64 .comm3_
46903 2.5036 mgrid_base.gcc_hunt_64 .resid_
5103 0.2724 libc-2.17.so .__memset_power8
>From gcc-bugs-return-596416-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 16:38:51 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84737] [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888
Date: Tue, 06 Mar 2018 16:38:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Component|ipa |tree-optimization
Target Milestone|--- |8.0
Summary|20% degradation in CPU2000 |[8 Regression] 20%
|172.mgrid starting with |degradation in CPU2000
|r256888 |172.mgrid starting with
| |r256888
>From gcc-bugs-return-596417-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 16:42:58 2018
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Subject: [Bug sanitizer/84732] false-positive -Wstringop-truncation warning with -fsanitize-coverage=trace-pc
Date: Tue, 06 Mar 2018 16:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84732
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
In general, by inserting their instrumentation the sanitizers cause all sorts
of trouble for middle-end warnings. The usual answer has been to disable
-Werror when using -fsanitize. Personally, I think that's less than optimal
(ideally we want both good static analysis and robust runtime detection), but
sometimes it may be the only viable solution.
The -Wstringop-truncation suppression logic looks for the next statement after
a strncpy call that writes a NUL into the destination (actually, it looks for
an assignment of any value to the destination for now, but that will likely
change in the future). The __builtin___sanitizer_cov_trace_pc() call inserted
by the sanitizer just after the strncpy() call disables the suppression.
__builtin_strncpy (&a.a, arg.0_1, 16);
<bb 4> [local count: 1073741825]:
__builtin___sanitizer_cov_trace_pc ();
There are other similar examples where this can happen (e.g., bug 84624). It
might be possible to deal with some of them either by hardcoding a whitelist of
things to skip over, or by making the logic smart enough to see that some
calls/expressions cannot access (read from) the strncpy destination, or some
combination of the two. Richi has been suggesting the latter approach. The
challenge (for me) is to figure out how to avoid false negatives on things
like:
void f (const char *s)
{
char d[8];
char *p = strncpy (d, s, sizeof d); // want a -Wstringop-truncation here
foo (p); // reads a string from d
d[sizeof d - 1] = '\0';
}
or even:
extern char *p;
void f (const char *s)
{
char d[8];
p = strncpy (d, s, sizeof d); // also want a -Wstringop-truncation here
foo (); // also reads a string from d through p
d[sizeof d - 1] = '\0';
}
>From gcc-bugs-return-596418-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 16:57:08 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/84732] false-positive -Wstringop-truncation warning with -fsanitize-coverage=trace-pc
Date: Tue, 06 Mar 2018 16:57:00 -0000
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #2)
> I guess it somehow confuses VRP, Martin can you please take a look? Note
> that __builtin___sanitizer_cov_trace_pc is pure function, can't modify
> memory in original program.
No, __builtin___sanitizer_cov_trace_pc is certainly not pure and can't really
be, otherwise would optimize them all away (nothing uses their void return
value),
so the problem is that it invalidates all recorded string lengths, at least
those that escape (but in this testcase it is a global variable).
As __sanitizer_cov_trace_pc is a user-supplied function, I don't really think
we can assume anything on it (e.g. that it will not change any global or
escaped local variables, it can change them and most likely will do at least
some of them, otherwise it would be useless).
>From gcc-bugs-return-596419-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 17:10:07 2018
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From: "raphael.kubo.da.costa at intel dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/70431] [C++11] Out of line defaulted copy constructor of a union does not compile.
Date: Tue, 06 Mar 2018 17:10:00 -0000
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Raphael Kubo da Costa <raphael.kubo.da.costa at intel dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |raphael.kubo.da.costa@intel
| |.com
--- Comment #1 from Raphael Kubo da Costa <raphael.kubo.da.costa at intel dot com> ---
This is also true for classes and structs, I've just run into the same bug with
7.3.1 and 8.0.1 when debugging
https://chromium-review.googlesource.com/c/chromium/src/+/944403
>From gcc-bugs-return-596420-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 17:41:41 2018
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From: "ville.voutilainen at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/70431] [C++11] Out of line defaulted copy constructor of a union does not compile.
Date: Tue, 06 Mar 2018 17:41:00 -0000
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Ville Voutilainen <ville.voutilainen at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-06
CC| |jason at redhat dot com
Ever confirmed|0 |1
--- Comment #2 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
clang accepts the code.
>From gcc-bugs-return-596421-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 17:47:01 2018
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From: "jr98 at hotmail dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/84738] New: stack-overflow in regex_match
Date: Tue, 06 Mar 2018 17:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84738
Bug ID: 84738
Summary: stack-overflow in regex_match
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: jr98 at hotmail dot de
Target Milestone: ---
The following code crashes with a stack-oveflow
Code: (min.cpp)
#include <string>
#include <regex>
int main(int argc, char *argv[])
{
std::regex re("y**{83}{72}b");
std::regex_match("", re);
return 0;
}
Compile comandline:
g++-7 -fsanitize=address -std=c++17 -O2 -g -ggdb min.cpp
Version:
g++-7 -v
Using built-in specs.
COLLECT_GCC=g++-7
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
7.2.0-8ubuntu3.2' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-7
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --with-target-system-zlib --enable-objc-gc=auto
--enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 7.2.0 (Ubuntu 7.2.0-8ubuntu3.2)
__GLIBCXX__ is 20171003
>From gcc-bugs-return-596422-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 18:22:39 2018
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From: "gscfq@t-online.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/84739] New: [6/7/8 Regression] ICE in get_value_for_expr, at tree-ssa-ccp.c:649
Date: Tue, 06 Mar 2018 18:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84739
Bug ID: 84739
Summary: [6/7/8 Regression] ICE in get_value_for_expr, at
tree-ssa-ccp.c:649
Product: gcc
Version: 8.0
Status: UNCONFIRMED
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Affects versions 6/7/8 at -O[s23] :
$ cat z1.c
static void baz (void) __attribute__((weakref("bar")));
int
foo (int x, int y)
{
if (x)
y = 0;
if (y)
goto L1;
y = 0;
L1:
return y;
}
void
bar (int x, int y)
{
y = foo (x, y);
if (y != 0)
baz ();
}
$ gcc-5 -O2 -c z1.c
$
$ gcc-8-20180304 -O2 -c z1.c
z1.c:1:13: warning: 'baz' alias between functions of incompatible types
'void(void)' and 'void(int, int)' [-Wattribute-alias]
static void baz (void) __attribute__((weakref("bar")));
^~~
z1.c:14:1: note: aliased declaration here
bar (int x, int y)
^~~
during GIMPLE pass: ccp
z1.c: In function 'bar':
z1.c:14:1: internal compiler error: Segmentation fault
0xaed10f crash_signal
../../gcc/toplev.c:325
0xbc5401 get_value_for_expr
../../gcc/tree-ssa-ccp.c:649
0xbc7ea8 ccp_propagate::visit_phi(gphi*)
../../gcc/tree-ssa-ccp.c:1133
0xc42778 ssa_propagation_engine::simulate_stmt(gimple*)
../../gcc/tree-ssa-propagate.c:233
0xc42992 ssa_propagation_engine::simulate_block(basic_block_def*)
../../gcc/tree-ssa-propagate.c:359
0xc43669 ssa_propagation_engine::ssa_propagate()
../../gcc/tree-ssa-propagate.c:800
0xbc4697 do_ssa_ccp
../../gcc/tree-ssa-ccp.c:2474
0xbc4697 execute
../../gcc/tree-ssa-ccp.c:2518
>From gcc-bugs-return-596423-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 18:23:04 2018
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Subject: [Bug c/84739] [6/7/8 Regression] ICE in get_value_for_expr, at tree-ssa-ccp.c:649
Date: Tue, 06 Mar 2018 18:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84739
--- Comment #1 from G. Steinmetz <gscfq@t-online.de> ---
Configured with --enable-checking=yes :
$ gcc-8-20180304 -O2 -c z1.c
z1.c:1:13: warning: 'baz' alias between functions of incompatible types
'void(void)' and 'void(int, int)' [-Wattribute-alias]
static void baz (void) __attribute__((weakref("bar")));
^~~
z1.c:14:1: note: aliased declaration here
bar (int x, int y)
^~~
during GIMPLE pass: tailr
z1.c: In function 'bar':
z1.c:19:1: internal compiler error: in gimple_call_arg, at gimple.h:3179
}
^
0xecae86 gimple_call_arg
../../gcc/gimple.h:3179
0xecae86 gimple_call_arg
../../gcc/gimple.h:3187
0xecae86 eliminate_tail_call
../../gcc/tree-tailcall.c:921
0xecae86 optimize_tail_call
../../gcc/tree-tailcall.c:953
0xecae86 tree_optimize_tail_calls_1
../../gcc/tree-tailcall.c:1082
>From gcc-bugs-return-596424-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 18:26:46 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/84740] New: [8 Regression] ICE in build_constructors, at tree-switch-conversion.c:965
Date: Tue, 06 Mar 2018 18:26:00 -0000
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Bug ID: 84740
Summary: [8 Regression] ICE in build_constructors, at
tree-switch-conversion.c:965
Product: gcc
Version: 8.0
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Gives an ICE at -O[s23] since at least 20170618.
Shrinked/modified from gcc.dg/tree-ssa/cswtch-4.c
$ cat z1.c
void
frobulate_for_gcc (unsigned int v)
{
const char *s;
switch (v)
{
case 0:
s = "foo";
break;
case 1:
s = "bar";
break;
case 2:
s = "spam";
break;
default:
s = (const char *) 0;
break;
}
if (!s)
__builtin_printf ("%s\n", s);
}
$ gcc-7 -c z1.c -O2
$ gcc-8-20180304 -c z1.c -O1
$ gcc-8-20180304 -c z1.c -O2
during GIMPLE pass: switchconv
z1.c: In function 'frobulate_for_gcc':
z1.c:22:1: internal compiler error: in build_constructors, at
tree-switch-conversion.c:965
}
^
0xbb98a0 build_constructors
../../gcc/tree-switch-conversion.c:965
0xbb98a0 process_switch
../../gcc/tree-switch-conversion.c:1566
0xbb98a0 execute
../../gcc/tree-switch-conversion.c:1630
No ICE without line "if (!s)".
>From gcc-bugs-return-596425-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 18:28:33 2018
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From: "sudi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84521] [8 Regression] aarch64: Frame-pointer corruption with __builtin_setjmp/__builtin_longjmp and -fomit-frame-pointer
Date: Tue, 06 Mar 2018 18:28:00 -0000
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--- Comment #16 from sudi at gcc dot gnu.org ---
So I think I would go with Jakub's suggestion of defining calls_builtin_setjmp
and use that in aarch64_layout_frame for cfun->machine->frame.emit_frame_chain.
I am still investigating Wilco's concern over pr60003.c
Also I would like to ask if we can pick up the discussions on PR59039 and on
the documentation patch. Some definition would be a lot more helpful for
someone like me who had no idea about __builtin_setjmp/longjmp to wrap my head
around what it actually is.
The macro DONT_USE_BUITIN_SETJMP made me very confused for a while until Ramana
pointed it out to me that its only used in the context of compiler's exception
unwinding machinery and does not apply to a case like this where the user calls
the builtin function. With this context in head when I went back and read the
document, it made sense. Can we possibly tweak the wording to make it clearer?
>From gcc-bugs-return-596426-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 18:30:24 2018
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Subject: [Bug c/84741] New: [7/8 Regression] ICE in ix86_expand_prologue, at config/i386/i386.c:13893
Date: Tue, 06 Mar 2018 18:30:00 -0000
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Bug ID: 84741
Summary: [7/8 Regression] ICE in ix86_expand_prologue, at
config/i386/i386.c:13893
Product: gcc
Version: 8.0
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Starts to ICE from 20170129 on with option -fstack-usage.
File gcc/testsuite/gcc.dg/rtl/x86_64/test-return-const.c.after-expand.c
$ gcc-8-20180304 -c test-return-const.c.after-expand.c
$ gcc-8-20180304 -c test-return-const.c.after-expand.c -fstack-usage
during RTL pass: pro_and_epilogue
test-return-const.c.after-expand.c: In function 'test_returning_constant':
test-return-const.c.after-expand.c:32:1: internal compiler error: Segmentation
fault
}
^
0xaed10f crash_signal
../../gcc/toplev.c:325
0xda329c ix86_expand_prologue()
../../gcc/config/i386/i386.c:13893
0xfc4cda gen_prologue()
../../gcc/config/i386/i386.md:13183
0xd8f588 target_gen_prologue
../../gcc/config/i386/i386.md:19561
0x88f139 make_prologue_seq
../../gcc/function.c:5926
0x88f352 thread_prologue_and_epilogue_insns()
../../gcc/function.c:6043
0x88f9f2 rest_of_handle_thread_prologue_and_epilogue
../../gcc/function.c:6534
0x88f9f2 execute
../../gcc/function.c:6576
>From gcc-bugs-return-596427-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 18:42:26 2018
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Subject: [Bug target/83748] Local variables not aligned to word boundary
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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Resolution|--- |WORKSFORME
--- Comment #7 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Closing this now.
This was fixed in 2013, in r205896 -- so should be fixed in 4.9 already.
That commit added this to the documentation:
In some cases, such as when the 'packed' attribute is applied to a
structure field, it may not be possible to access the field with a
single read or write that is correctly aligned for the target
machine. In this case GCC falls back to generating multiple
accesses rather than code that will fault or truncate the result at
run time.
(and also added the code to implement it; as you noticed, older compilers
will do misaligned loads if you're not careful).
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug inline-asm/84742] New: internal compiler error: in process_alt_operands, at lra-constraints.c:2112
Date: Tue, 06 Mar 2018 18:46:00 -0000
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Bug ID: 84742
Summary: internal compiler error: in process_alt_operands, at
lra-constraints.c:2112
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Keywords: ice-on-invalid-code
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Created attachment 43580
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43580&action=edit
valgrind output
Input:
void a() {
char b;
asm volatile ("" :
"+fm<rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggx<gT,ggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg"
(b));
{
try {
} catch (char ()) {
}
}
}
Output:
$ xgcc -x c++ -S -std=c++14 -O3 -fpermissive -fno-toplevel-reorder -
during RTL pass: reload
<stdin>: In function 'void a()':
<stdin>:9:1: internal compiler error: in process_alt_operands, at
lra-constraints.c:2112
0x289cf5b process_alt_operands
/home/vegard/git/gcc/gcc/lra-constraints.c:2112
0x28a6043 curr_insn_transform
/home/vegard/git/gcc/gcc/lra-constraints.c:3860
0x28b93b6 lra_constraints(bool)
/home/vegard/git/gcc/gcc/lra-constraints.c:4877
0x2829984 lra(_IO_FILE*)
/home/vegard/git/gcc/gcc/lra.c:2419
0x2608794 do_reload
/home/vegard/git/gcc/gcc/ira.c:5465
0x2608794 execute
/home/vegard/git/gcc/gcc/ira.c:5649
$ xgcc --version
xgcc (GCC) 8.0.1 20180306 (experimental)
Built from git 11a93d7a09b871b3b9a2eb108eb91ad83d94e070 (r258271).
This one is a bit of a weird one. It doesn't reproduce with "trunk" on
godbolt.org for me and the crash itself is indeterministic. Sometimes the
compiler doesn't print anything and it returns 0, sometimes it hangs after
printing "during RTL pass: reload", and sometimes it gives the splat above
(about 1 in every 10 runs, I'd say). I recommend running it in a loop to
increase the chances of reproducing.
Valgrind shows a bunch of errors, this is the first one:
==31845== Conditional jump or move depends on uninitialised value(s)
==31845== at 0x2757C74: sparseset_bit_p (sparseset.h:147)
==31845== by 0x2757C74: mark_pseudo_regno_live(int) (ira-lives.c:289)
==31845== by 0x2760800: process_bb_node_lives(ira_loop_tree_node*)
(ira-lives.c:1140)
==31845== by 0x2677F7D: ira_traverse_loop_tree(bool, ira_loop_tree_node*,
void (*)(ira_loop_tree_node*), void (*)(ira_loop_tree_node*))
(ira-build.c:1806)
==31845== by 0x276BED9: ira_create_allocno_live_ranges() (ira-lives.c:1565)
==31845== by 0x2687F08: ira_build() (ira-build.c:3429)
==31845== by 0x2640C54: ira (ira.c:5295)
==31845== by 0x2640C54: (anonymous namespace)::pass_ira::execute(function*)
(ira.c:5606)
==31845== by 0x2B7EDA7: execute_one_pass(opt_pass*) (passes.c:2497)
==31845== by 0x2B84CFB: execute_pass_list_1(opt_pass*) [clone .constprop.89]
(passes.c:2586)
==31845== by 0x2B85DA0: execute_pass_list_1 (passes.c:2587)
==31845== by 0x2B85DA0: execute_pass_list(function*, opt_pass*)
(passes.c:2597)
==31845== by 0x19A118E: cgraph_node::expand() (cgraphunit.c:2139)
==31845== by 0x19AA5A7: expand_all_functions (cgraphunit.c:2275)
==31845== by 0x19AA5A7: symbol_table::compile() [clone .part.56]
(cgraphunit.c:2624)
==31845== by 0x19B84D7: compile (cgraphunit.c:2537)
==31845== by 0x19B84D7: symbol_table::finalize_compilation_unit()
(cgraphunit.c:2717)
I've attached a full valgrind log as well, in case that helps.
Test case was minimised by C-Reduce.
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Subject: [Bug tree-optimization/84739] [6/7/8 Regression] ICE in get_value_for_expr, at tree-ssa-ccp.c:649
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug target/84371] test case gcc.target/powerpc/builtins-3.c fails on power9
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Will Schmidt <willschm at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #7 from Will Schmidt <willschm at gcc dot gnu.org> ---
fixed and backported. Closing now.
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Subject: [Bug fortran/56667] Syntax error causes misleading message: "Expected PARAMETER symbol in complex constant"
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--- Comment #4 from kargl at gcc dot gnu.org ---
Author: kargl
Date: Tue Mar 6 19:05:48 2018
New Revision: 258281
URL: https://gcc.gnu.org/viewcvs?rev=258281&root=gcc&view=rev
Log:
2018-03-06 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/56667
* primary.c (match_sym_complex_part): Give the matcher for an implied
do-loop a chance to run.
2018-03-06 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/56667
* gfortran.dg/implied_do_2.f90: New test.
* gfortran.dg/coarray_8.f90: Update for new error message.
Added:
trunk/gcc/testsuite/gfortran.dg/implied_do_2.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/primary.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gfortran.dg/coarray_8.f90
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Subject: [Bug rtl-optimization/82982] [8 Regression] ICE: qsort checking failed (error: qsort comparator non-negative on sorted output: 5) in ready_sort_real in haifa scheduler
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--- Comment #8 from Will Schmidt <willschm at gcc dot gnu.org> ---
(In reply to Will Schmidt from comment #6)
> (In reply to Arseny Solokha from comment #5)
> > (In reply to Will Schmidt from comment #4)
> > > Tried to re-create locally, I've gotten two ICE's using the provided
> > > testcode snippet, neither look quite like the originally reported issue.
> >
> > You are right. I also cannot reproduce the original issue anymore w/ r257975.
>
> Today I cannot get any ICE's out of this test. Wonder if things were fixed
> up in the mean-time, or if I tickled a config option and managed to hide the
> issue(s). Going to try a few more runs with older trees to see if I can
> verify things are fixed.
(In reply to Arseny Solokha from comment #7)
> OK, the original issue still reproduces for the powerpc-e500v2-linux-gnuspe
> target as of r257975, so the change that affected this issue must have been
> local to the rs6000 backend.
Ok. so at the moment I'm going to claim that I am unable to recreate the
initially reported problem in my environments, which are 64-bit or 64/32 mixed.
Nothing pure 32-bit here, nothing e300* or e500*, etc.
The ICe's that I did see (comment #4) seem to be to be a separate issue. Those
only occur in my sandbox/debug build of gcc, which has
CFLAGS,CXXFLAGS,CFLAGS_FOR_BUILD, CFLAGS_FOR_TARGET, etc all set to "-O0 -g3
-fno-inline". I otherwise don't see any ICE with this test case.
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Subject: [Bug c++/79937] [6/7/8 Regression] ICE in replace_placeholders_r
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--- Comment #16 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #13)
> E.g. could we walk into TARGET_EXPRs that have TARGET_EXPR_INITIAL
> AGGR_INIT_EXPR, but avoid those that have TARGET_EXPR_INITIAL a CONSTRUCTOR,
> or a CONSTRUCTOR with certain flags, or have some flags on TARGET_EXPRs?
No, the form of the TARGET_EXPR isn't sufficient to distinguish. Here's a
complete testcase:
struct X {
unsigned i;
unsigned n = i;
};
X bar(X x) {
return x;
}
struct Y
{
static Y bar(Y y) { return y; }
unsigned i;
unsigned n = bar(Y{2,i}).n;
};
int main()
{
X x { 1, bar(X{2}).n };
if (x.n != 2)
__builtin_abort();
Y y { 1 };
if (y.n != 1)
__builtin_abort();
}
Here, the initializers for x and y end up looking equivalent within
store_init_value, but the PLACEHOLDER_EXPRs are meant to refer to different
objects. There's no way for replace_placeholders to tell the difference.
I think to handle this we'll need to change process_init_constructor_record to
either not expose PLACEHOLDER_EXPRs, or adjust them to indicate better which
CONSTRUCTOR they refer to.
>From gcc-bugs-return-596434-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 19:28:24 2018
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Subject: [Bug fortran/56667] Syntax error causes misleading message: "Expected PARAMETER symbol in complex constant"
Date: Tue, 06 Mar 2018 19:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56667
--- Comment #5 from kargl at gcc dot gnu.org ---
Author: kargl
Date: Tue Mar 6 19:27:48 2018
New Revision: 258282
URL: https://gcc.gnu.org/viewcvs?rev=258282&root=gcc&view=rev
Log:
2018-03-06 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/56667
* primary.c (match_sym_complex_part): Give the matcher for an implied
do-loop a chance to run.
2018-03-06 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/56667
* gfortran.dg/implied_do_2.f90: New test.
* gfortran.dg/coarray_8.f90: Update for new error message.
Added:
branches/gcc-7-branch/gcc/testsuite/gfortran.dg/implied_do_2.f90
Modified:
branches/gcc-7-branch/gcc/fortran/ChangeLog
branches/gcc-7-branch/gcc/fortran/primary.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
branches/gcc-7-branch/gcc/testsuite/gfortran.dg/coarray_8.f90
>From gcc-bugs-return-596435-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 19:31:35 2018
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Subject: [Bug fortran/56667] Syntax error causes misleading message: "Expected PARAMETER symbol in complex constant"
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56667
--- Comment #6 from kargl at gcc dot gnu.org ---
Author: kargl
Date: Tue Mar 6 19:30:41 2018
New Revision: 258283
URL: https://gcc.gnu.org/viewcvs?rev=258283&root=gcc&view=rev
Log:
2018-03-06 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/56667
* primary.c (match_sym_complex_part): Give the matcher for an implied
do-loop a chance to run.
2018-03-06 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/56667
* gfortran.dg/implied_do_2.f90: New test.
* gfortran.dg/coarray_8.f90: Update for new error message.
Added:
branches/gcc-6-branch/gcc/testsuite/gfortran.dg/implied_do_2.f90
Modified:
branches/gcc-6-branch/gcc/fortran/ChangeLog
branches/gcc-6-branch/gcc/fortran/primary.c
branches/gcc-6-branch/gcc/testsuite/ChangeLog
branches/gcc-6-branch/gcc/testsuite/gfortran.dg/coarray_8.f90
>From gcc-bugs-return-596436-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 19:32:16 2018
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Subject: [Bug fortran/56667] Syntax error causes misleading message: "Expected PARAMETER symbol in complex constant"
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |6.5
--- Comment #7 from kargl at gcc dot gnu.org ---
Fixed on 6-branch, 7-branch, and trunk.
Thanks for bug report.
>From gcc-bugs-return-596437-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 19:53:22 2018
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Subject: [Bug target/84743] New: default widths for parallel reassociation now hurt rather than help
Date: Tue, 06 Mar 2018 19:53:00 -0000
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Bug ID: 84743
Summary: default widths for parallel reassociation now hurt
rather than help
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: acsawdey at gcc dot gnu.org
Reporter: acsawdey at gcc dot gnu.org
Target Milestone: ---
Target: powerpc64le power8
The width settings in rs6000_reassociation_width() were chosen to help
performance for SPEC CPU in gcc 7.
Testing on power8 shows that in gcc 8 (258101) there are now major degradations
in CPU2017 int with the default reassociation widths as compared to using
--param tree-reassoc-width=1 to disable reassociation.
Benchmark
500.perlbench_r -5.98%
502.gcc_r -1.16%
505.mcf_r -12.44%
520.omnetpp_r -39.00%
523.xalancbmk_r -9.78%
525.x264_r -1.76%
531.deepsjeng_r -4.23%
548.exchange2_r -0.66%
557.xz_r -2.04%
>From gcc-bugs-return-596438-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 20:00:55 2018
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Subject: [Bug target/84743] default widths for parallel reassociation now hurt rather than help
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
CC| |segher at gcc dot gnu.org
--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
This needs to be fixed before GCC 8 release.
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Subject: [Bug lto/83954] [6/7 Regression] LTO: Bogus -Wlto-type-mismatch warning for array of pointer to incomplete type
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--- Comment #14 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Mar 6 20:01:44 2018
New Revision: 258285
URL: https://gcc.gnu.org/viewcvs?rev=258285&root=gcc&view=rev
Log:
Backport r257183
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-01-30 Jan Hubicka <hubicka@ucw.cz>
PR lto/83954
* lto-symtab.c (warn_type_compatibility_p): Silence false positive
for type match warning on arrays of pointers.
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-01-30 Jan Hubicka <hubicka@ucw.cz>
PR lto/83954
* gcc.dg/lto/pr83954.h: New testcase.
* gcc.dg/lto/pr83954_0.c: New testcase.
* gcc.dg/lto/pr83954_1.c: New testcase.
Added:
branches/gcc-7-branch/gcc/testsuite/gcc.dg/lto/pr83954.h
branches/gcc-7-branch/gcc/testsuite/gcc.dg/lto/pr83954_0.c
branches/gcc-7-branch/gcc/testsuite/gcc.dg/lto/pr83954_1.c
Modified:
branches/gcc-7-branch/gcc/lto/ChangeLog
branches/gcc-7-branch/gcc/lto/lto-symtab.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
>From gcc-bugs-return-596440-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 20:02:39 2018
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Subject: [Bug lto/83954] [6/7 Regression] LTO: Bogus -Wlto-type-mismatch warning for array of pointer to incomplete type
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--- Comment #15 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Mar 6 20:02:03 2018
New Revision: 258286
URL: https://gcc.gnu.org/viewcvs?rev=258286&root=gcc&view=rev
Log:
Backport r257343
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-02 Eric Botcazou <ebotcazou@adacore.com>
PR lto/83954
* lto-symtab.c (warn_type_compatibility_p): Do not recurse into the
component type of array types with non-aliased component.
Modified:
branches/gcc-7-branch/gcc/lto/ChangeLog
branches/gcc-7-branch/gcc/lto/lto-symtab.c
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Subject: [Bug lto/81004] [7 Regression] linking failed with -flto and static libboost_program_options
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81004
--- Comment #27 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Mar 6 20:02:22 2018
New Revision: 258287
URL: https://gcc.gnu.org/viewcvs?rev=258287&root=gcc&view=rev
Log:
Backport r257412
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-01-30 Jan Hubicka <hubicka@ucw.cz>
PR lto/81004
* lto.c: Include builtins.h
(register_resolution): Merge resolutions in case trees was
merged across units.
(lto_maybe_register_decl): Break out from ...
(lto_read_decls): ... here.
(unify_scc): Also register decls here.
(read_cgraph_and_symbols): Sanity check that all resolutions was
read.
Modified:
branches/gcc-7-branch/gcc/lto/ChangeLog
branches/gcc-7-branch/gcc/lto/lto.c
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Subject: [Bug ipa/81360] [8 Regression] ice in estimate_edge_growth, at ipa-inline.h:86
Date: Tue, 06 Mar 2018 20:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81360
--- Comment #17 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Mar 6 20:04:20 2018
New Revision: 258289
URL: https://gcc.gnu.org/viewcvs?rev=258289&root=gcc&view=rev
Log:
Backport r257490
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-08 Jan Hubicka <hubicka@ucw.cz>
PR ipa/81360
* cgraph.h (symtab_node::output_to_lto_symbol_table_p): Declare
* symtab.c: Include builtins.h
(symtab_node::output_to_lto_symbol_table_p): Move here
from lto-streamer-out.c:output_symbol_p.
* lto-streamer-out.c (write_symbol): Turn early exit to assert.
(output_symbol_p): Move all logic to symtab.c
(produce_symtab): Update.
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-08 Jan Hubicka <hubicka@ucw.cz>
PR ipa/81360
* lto.c (unify_scc): Register prevailing trees, not trees to be freed.
(read_cgraph_and_symbols): Use
symtab_node::output_to_lto_symbol_table_p.
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/cgraph.h
branches/gcc-7-branch/gcc/lto-streamer-out.c
branches/gcc-7-branch/gcc/lto/ChangeLog
branches/gcc-7-branch/gcc/lto/lto.c
branches/gcc-7-branch/gcc/symtab.c
branches/gcc-7-branch/gcc/tree.c
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Subject: [Bug c/84229] A valid code rejected with -flto
Date: Tue, 06 Mar 2018 20:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84229
--- Comment #11 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Mar 6 20:04:36 2018
New Revision: 258290
URL: https://gcc.gnu.org/viewcvs?rev=258290&root=gcc&view=rev
Log:
Backport r257877
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-21 Jan Hubicka <hubicka@ucw.cz>
PR c/84229
* ipa-cp.c (determine_versionability): Do not version functions caling
va_arg_pack.
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/ipa-cp.c
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Subject: [Bug testsuite/79455] c-c++-common/tsan/race_on_mutex.c fails on powerpcle starting with r244854 (where it was activated)
Date: Tue, 06 Mar 2018 20:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79455
--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Mar 6 20:05:52 2018
New Revision: 258293
URL: https://gcc.gnu.org/viewcvs?rev=258293&root=gcc&view=rev
Log:
Backport r247342
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2017-04-27 Martin Liska <mliska@suse.cz>
PR testsuite/79455
* c-c++-common/tsan/race_on_mutex.c: Make the scanned pattern
more generic.
Modified:
branches/gcc-7-branch/gcc/testsuite/ChangeLog
branches/gcc-7-branch/gcc/testsuite/c-c++-common/tsan/race_on_mutex.c
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Subject: [Bug rtl-optimization/82675] ICE in duplicate_loop_to_header_edge at gcc/cfgloopmanip.c:1207
Date: Tue, 06 Mar 2018 20:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82675
--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Mar 6 20:06:10 2018
New Revision: 258294
URL: https://gcc.gnu.org/viewcvs?rev=258294&root=gcc&view=rev
Log:
Backport r255818
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2017-12-19 Martin Liska <mliska@suse.cz>
PR rtl-optimization/82675
* loop-unroll.c (unroll_loop_constant_iterations): Allocate one
more element in sbitmap.
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/loop-unroll.c
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Subject: [Bug gcov-profile/84137] Typo in gcov online documentation
Date: Tue, 06 Mar 2018 20:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84137
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Mar 6 20:06:56 2018
New Revision: 258297
URL: https://gcc.gnu.org/viewcvs?rev=258297&root=gcc&view=rev
Log:
Backport r257384
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-05 Martin Liska <mliska@suse.cz>
PR gcov-profile/84137
* doc/gcov.texi: Fix typo in documentation.
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/doc/gcov.texi
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Subject: [Bug lto/81440] -Wlto-type-mismatch warning with flexible array in struct
Date: Tue, 06 Mar 2018 20:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81440
--- Comment #10 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Mar 6 20:06:29 2018
New Revision: 258295
URL: https://gcc.gnu.org/viewcvs?rev=258295&root=gcc&view=rev
Log:
Backport r256989
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-01-23 Martin Liska <mliska@suse.cz>
PR lto/81440
* lto-symtab.c (lto_symtab_merge): Handle and do not warn about
trailing arrays at the end of a struct.
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-01-23 Martin Liska <mliska@suse.cz>
PR lto/81440
* gcc.dg/lto/pr81440.h: New test.
* gcc.dg/lto/pr81440_0.c: New test.
* gcc.dg/lto/pr81440_1.c: New test.
Added:
branches/gcc-7-branch/gcc/testsuite/gcc.dg/lto/pr81440.h
branches/gcc-7-branch/gcc/testsuite/gcc.dg/lto/pr81440_0.c
branches/gcc-7-branch/gcc/testsuite/gcc.dg/lto/pr81440_1.c
Modified:
branches/gcc-7-branch/gcc/lto/ChangeLog
branches/gcc-7-branch/gcc/lto/lto-symtab.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
>From gcc-bugs-return-596447-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 20:07:22 2018
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Subject: [Bug gcov-profile/83879] __gcov_dump doesn't work with dlopen-ed libraries
Date: Tue, 06 Mar 2018 20:07:00 -0000
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--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Mar 6 20:06:45 2018
New Revision: 258296
URL: https://gcc.gnu.org/viewcvs?rev=258296&root=gcc&view=rev
Log:
Backport r257383
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-05 Martin Liska <mliska@suse.cz>
PR gcov-profile/83879
* doc/gcov.texi: Document necessity of --dynamic-list-data when
using dlopen functionality.
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/doc/gcov.texi
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Subject: [Bug other/80589] Typing mistakes in two messages
Date: Tue, 06 Mar 2018 20:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80589
--- Comment #12 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Mar 6 20:07:18 2018
New Revision: 258298
URL: https://gcc.gnu.org/viewcvs?rev=258298&root=gcc&view=rev
Log:
Backport r257803
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-19 Martin Liska <mliska@suse.cz>
PR other/80589
* doc/invoke.texi: Fix typo.
* params.def (PARAM_MAX_LOOP_HEADER_INSNS): Likewise.
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/doc/invoke.texi
branches/gcc-7-branch/gcc/params.def
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Subject: [Bug target/79747] Missing documentation for -malign-{jumps,label,loops,functions}= and strange value range limitation
Date: Tue, 06 Mar 2018 20:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79747
--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Mar 6 20:07:38 2018
New Revision: 258299
URL: https://gcc.gnu.org/viewcvs?rev=258299&root=gcc&view=rev
Log:
Backport r257842
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-20 Martin Liska <mliska@suse.cz>
PR c/84310
PR target/79747
* final.c (shorten_branches): Build align_tab array with one
more element.
* opts.c (finish_options): Add alignment option limit check.
(MAX_CODE_ALIGN): Likewise.
(MAX_CODE_ALIGN_VALUE): Likewise.
* doc/invoke.texi: Document maximum allowed option value for
all -falign-* options.
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-20 Martin Liska <mliska@suse.cz>
PR c/84310
PR target/79747
* gcc.target/i386/pr84310.c: New test.
* gcc.target/i386/pr84310-2.c: Likewise.
Added:
branches/gcc-7-branch/gcc/testsuite/gcc.target/i386/pr84310-2.c
branches/gcc-7-branch/gcc/testsuite/gcc.target/i386/pr84310.c
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/doc/invoke.texi
branches/gcc-7-branch/gcc/final.c
branches/gcc-7-branch/gcc/opts.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug c/84310] -falign-{labels,loops,jumps} with value >= 32768+1 cause a segfault
Date: Tue, 06 Mar 2018 20:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84310
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Mar 6 20:07:38 2018
New Revision: 258299
URL: https://gcc.gnu.org/viewcvs?rev=258299&root=gcc&view=rev
Log:
Backport r257842
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-20 Martin Liska <mliska@suse.cz>
PR c/84310
PR target/79747
* final.c (shorten_branches): Build align_tab array with one
more element.
* opts.c (finish_options): Add alignment option limit check.
(MAX_CODE_ALIGN): Likewise.
(MAX_CODE_ALIGN_VALUE): Likewise.
* doc/invoke.texi: Document maximum allowed option value for
all -falign-* options.
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-20 Martin Liska <mliska@suse.cz>
PR c/84310
PR target/79747
* gcc.target/i386/pr84310.c: New test.
* gcc.target/i386/pr84310-2.c: Likewise.
Added:
branches/gcc-7-branch/gcc/testsuite/gcc.target/i386/pr84310-2.c
branches/gcc-7-branch/gcc/testsuite/gcc.target/i386/pr84310.c
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/doc/invoke.texi
branches/gcc-7-branch/gcc/final.c
branches/gcc-7-branch/gcc/opts.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug testsuite/80551] c-c++-common/tsan/race_on_mutex.c fails on powerpc
Date: Tue, 06 Mar 2018 20:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80551
--- Comment #20 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Mar 6 20:07:49 2018
New Revision: 258300
URL: https://gcc.gnu.org/viewcvs?rev=258300&root=gcc&view=rev
Log:
Backport r257932
2018-03-06 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-23 Segher Boessenkool <segher@kernel.crashing.org>
PR testsuite/80551
* c-c++-common/tsan/race_on_mutex.c: Change regexp to allow
__GI___pthread_mutex_init as well.
Modified:
branches/gcc-7-branch/gcc/testsuite/ChangeLog
branches/gcc-7-branch/gcc/testsuite/c-c++-common/tsan/race_on_mutex.c
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Subject: [Bug testsuite/80551] c-c++-common/tsan/race_on_mutex.c fails on powerpc
Date: Tue, 06 Mar 2018 20:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80551
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |FIXED
--- Comment #21 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed now.
>From gcc-bugs-return-596454-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 20:36:47 2018
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84740] [8 Regression] ICE in build_constructors, at tree-switch-conversion.c:965
Date: Tue, 06 Mar 2018 20:36:00 -0000
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-06
CC| |dmalcolm at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Confirmed; assertion failure here:
#1 0x0000000000e405ce in build_constructors (info=0x7fffffffdb80,
swtch=<optimized out>)
at ../../src/gcc/tree-switch-conversion.c:965
965 gcc_assert (!info->contiguous_range);
(gdb) p info->contiguous_range
$1 = true
(gdb) call debug (info->range_min)
0
(gdb) call debug (info->range_max)
2
Started between r247528 (not affected) and r247538 (affected); probably
r247538.
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Subject: [Bug target/84710] [8 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1896 with -O -fno-forward-propagate
Date: Tue, 06 Mar 2018 20:42:00 -0000
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--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Mar 6 20:41:37 2018
New Revision: 258301
URL: https://gcc.gnu.org/viewcvs?rev=258301&root=gcc&view=rev
Log:
PR target/84710
* combine.c (try_combine): Use reg_or_subregno instead of handling
just paradoxical SUBREGs and REGs.
* gcc.dg/pr84710.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr84710.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/combine.c
trunk/gcc/testsuite/ChangeLog
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/84721] [8 Regression] ICE in c_push_function_context, at c-decl.c:9667
Date: Tue, 06 Mar 2018 20:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84721
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Mar 6 20:57:30 2018
New Revision: 258302
URL: https://gcc.gnu.org/viewcvs?rev=258302&root=gcc&view=rev
Log:
PR c/84721
* c-parser.c (add_debug_begin_stmt): Don't add DEBUG_BEGIN_STMT if
!building_stmt_list_p ().
* gcc.dg/pr84721.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr84721.c
Modified:
trunk/gcc/c/ChangeLog
trunk/gcc/c/c-parser.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/84710] [8 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1896 with -O -fno-forward-propagate
Date: Tue, 06 Mar 2018 20:59:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
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--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug c/84721] [8 Regression] ICE in c_push_function_context, at c-decl.c:9667
Date: Tue, 06 Mar 2018 20:59:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug fortran/64107] [F95] Pure function as array size
Date: Tue, 06 Mar 2018 21:06:00 -0000
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kargl at gcc dot gnu.org changed:
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--- Comment #1 from kargl at gcc dot gnu.org ---
This appears to be fixed by my patch for PR 83633. I will
convert the code and add it as a testcase to trunk.
% gfcx -o z a.f90
a.f90:15:22:
integer :: x2(foo())
1
Error: Explicit shaped array with nonconstant bounds at (1)
a.f90:24:22:
integer :: x4(foo())
1
Error: Explicit shaped array with nonconstant bounds at (1)
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Subject: [Bug c++/84684] inserting random code / flags produces wrong code
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--- Comment #17 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Tue Mar 6 21:11:46 2018
New Revision: 258303
URL: https://gcc.gnu.org/viewcvs?rev=258303&root=gcc&view=rev
Log:
PR c++/84684
* constexpr.c (cxx_bind_parameters_in_call): Unshare evaluated
arguments.
* g++.dg/cpp1z/constexpr-84684.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp1z/constexpr-84684.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/constexpr.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/83969] [8 Regression] ICE in final_scan_insn, at final.c:2997 (error: could not split insn) for powerpc targets
Date: Tue, 06 Mar 2018 21:24:00 -0000
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Peter Bergner <bergner at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #11 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to Peter Bergner from comment #10)
> + /* Don't allow non-offsettable addresses. See PRs 83969 and 84279. */
> + if (!offsettable_address_p (false, mode, addr))
> return false;
Ok, I had one regression and that was caused by a TImode load that was at the
end of the valid offset range...meaning "addr" was ok for a offset address, but
we could not add one more offset, which is what offsettable_address_p() tests
for. Looks like I just need to replace offsettable_address_p() with
rs6000_offsettable_memref_p(). That fixes the failing test case. I'll
rebootstrap/regtest with that change.
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Subject: [Bug tree-optimization/84740] [8 Regression] ICE in build_constructors, at tree-switch-conversion.c:965
Date: Tue, 06 Mar 2018 21:26:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
I can take a look.
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Subject: [Bug c++/79937] [6/7/8 Regression] ICE in replace_placeholders_r
Date: Tue, 06 Mar 2018 21:27:00 -0000
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--- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Jason Merrill from comment #16)
> (In reply to Jakub Jelinek from comment #13)
> > E.g. could we walk into TARGET_EXPRs that have TARGET_EXPR_INITIAL
> > AGGR_INIT_EXPR, but avoid those that have TARGET_EXPR_INITIAL a CONSTRUCTOR,
> > or a CONSTRUCTOR with certain flags, or have some flags on TARGET_EXPRs?
>
> No, the form of the TARGET_EXPR isn't sufficient to distinguish. Here's a
> complete testcase:
>
> struct X {
> unsigned i;
> unsigned n = i;
> };
>
> X bar(X x) {
> return x;
> }
>
> struct Y
> {
> static Y bar(Y y) { return y; }
> unsigned i;
> unsigned n = bar(Y{2,i}).n;
> };
>
> int main()
> {
> X x { 1, bar(X{2}).n };
> if (x.n != 2)
> __builtin_abort();
>
> Y y { 1 };
> if (y.n != 1)
> __builtin_abort();
> }
>
> Here, the initializers for x and y end up looking equivalent within
> store_init_value, but the PLACEHOLDER_EXPRs are meant to refer to different
> objects. There's no way for replace_placeholders to tell the difference.
>
> I think to handle this we'll need to change process_init_constructor_record
> to either not expose PLACEHOLDER_EXPRs, or adjust them to indicate better
> which CONSTRUCTOR they refer to.
Ah, ok, that indeed fails with my patch. Couldn't we mark somewhere using a
new lang flag the CONSTRUCTORs that are supposed to be boundaries for the
PLACEHOLDER_EXPRs
(in the above testcase on
{.i=1, .n=(TARGET_EXPR <D.2450, bar (TARGET_EXPR <D.2449, {.i=2,
.n=(&<PLACEHOLDER_EXPR struct X>)->i}>)>).n}
it would be the {.i=2, .n=(&<PLACEHOLDER_EXPR struct X>)->i} CONSTRUCTOR
and on
{.i=1, .n=(TARGET_EXPR <D.2452, Y::bar (TARGET_EXPR <D.2453, {.i=2,
.n=(&<PLACEHOLDER_EXPR struct Y>)->i}>)>).n}
it wouldn't mark any)? Is it the case that PLACEHOLDER_EXPRs should always
bind to some containing CONSTRUCTOR and can't be intermixed (say one
PLACEHOLDER_EXPR binding to inner CONSTRUCTOR and some other PLACEHOLDER_EXPR
within the same CONSTRUCTOR binding to an outer CONSTRUCTOR?
Or do you want the #c12 patch as a partial fix for GCC8 and come up with a real
fix for GCC9? Or do nothing for now, something else?
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Subject: [Bug libstdc++/84601] [8 Regression] std::optional<std::pair<int, int>> is not assignment copyable
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--- Comment #3 from ville at gcc dot gnu.org ---
Author: ville
Date: Tue Mar 6 21:43:03 2018
New Revision: 258304
URL: https://gcc.gnu.org/viewcvs?rev=258304&root=gcc&view=rev
Log:
PR libstdc++/84601
* include/std/optional (_Optional_payload): Split into multiple
specializations that can handle different cases of trivial or
non-trivial assignment operators.
* testsuite/20_util/optional/84601.cc: New.
* testsuite/20_util/optional/cons/value_neg.cc: Adjust.
Added:
trunk/libstdc++-v3/testsuite/20_util/optional/84601.cc
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/std/optional
trunk/libstdc++-v3/testsuite/20_util/optional/cons/value_neg.cc
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Subject: [Bug tree-optimization/84739] [6/7/8 Regression] ICE in get_value_for_expr, at tree-ssa-ccp.c:649
Date: Tue, 06 Mar 2018 21:45:00 -0000
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Last reconfirmed| |2018-03-06
CC| |dmalcolm at gcc dot gnu.org
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--- Comment #2 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Confirmed.
The ICE in comment #1 started with r231428.
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Subject: [Bug libstdc++/84601] [8 Regression] std::optional<std::pair<int, int>> is not assignment copyable
Date: Tue, 06 Mar 2018 21:47:00 -0000
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Ville Voutilainen <ville.voutilainen at gmail dot com> changed:
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--- Comment #4 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
Fixed.
>From gcc-bugs-return-596467-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 22:08:21 2018
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Subject: [Bug inline-asm/84677] internal compiler error: in extract_constrain_insn, at recog.c:2205
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org
--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Doesn't need the "-x c++".
Started somewhere between r229464 (unaffected) and r229470 (affected); probably
r229470.
Running into this for gcc 8 due to:
2572 if (flag_checking)
2573 check_rtl (true);
Is this valid code? My asm-syntax knowledge isn't strong.
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Subject: [Bug tree-optimization/84739] [6/7/8 Regression] ICE in get_value_for_expr, at tree-ssa-ccp.c:649
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Untested fix:
--- gcc/tree-tailcall.c.jj 2018-01-12 11:35:51.470222838 +0100
+++ gcc/tree-tailcall.c 2018-03-06 23:05:39.779048759 +0100
@@ -481,7 +481,7 @@ find_tail_calls (basic_block bb, struct
{
tree arg;
- for (param = DECL_ARGUMENTS (func), idx = 0;
+ for (param = DECL_ARGUMENTS (current_function_decl), idx = 0;
param && idx < gimple_call_num_args (call);
param = DECL_CHAIN (param), idx ++)
{
Wonder if the bug is also reproduceable when the gimple call has some different
fntype.
>From gcc-bugs-return-596469-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 22:24:53 2018
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Subject: [Bug debug/84550] [8 Regression] stepping through gcc does not work with gdb 8.0.1
Date: Tue, 06 Mar 2018 22:24:00 -0000
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--- Comment #10 from Pedro Alves <palves at redhat dot com> ---
It sounds that way, but I haven't verified, e.g., by trying older versions of
gdb, and/or bisecting.
Kevin, in addition to trying older versions of gdb with
freorder-blocks-and-partition, I'm curious about why gdb finds different ends
of prologue when stepping vs when setting a breakpoint. It may be that making
both spots use the same logic (e.g., it may one is skipping instructions
manually using the heuristic unwinders and another is using the line tables)
will be good enough of a stopgap to unblock this bug.
>From gcc-bugs-return-596470-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 22:57:50 2018
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Subject: [Bug fortran/64124] [F95] Valid constant expr rejected
Date: Tue, 06 Mar 2018 22:57:00 -0000
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kargl at gcc dot gnu.org changed:
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Assignee|unassigned at gcc dot gnu.org |kargl at gcc dot gnu.org
--- Comment #2 from kargl at gcc dot gnu.org ---
I think my patch for PR 70409 also fixes this one.
>From gcc-bugs-return-596471-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 23:14:05 2018
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From: "development@faf-ltd.com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/84744] New: cannot use glibc 2.27 with gcc 7.3
Date: Tue, 06 Mar 2018 23:14:00 -0000
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Bug ID: 84744
Summary: cannot use glibc 2.27 with gcc 7.3
Product: gcc
Version: 7.3.0
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Created attachment 43581
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43581&action=edit
error messages
I have installed gcc 7.3 in the /FaF directory and glibc 2.27 in the /FaF/glibc
directory.
Compiling this code
-------------------
#include <cstdlib>
#include <cmath>
int main( int argc, char * argv [] )
{
if ( argc != 2 )
{
return 1;
}
return std::abs(std::atoi(argv[1]));
}
with g++ -c foo.cpp works fine.
Adding the glibc 2.27 include path fails horrible: g++ -c foo.cpp -I
/FaF/glibc/include
Here the full error list: https://gofile.io/?c=J2Zwlv or see the attached file.
Compiling it with the system gcc 4.8.5 works fine even the glibc 2.27 include
path is added.
Output for g++ -xc++ -E -v - -I /FaF/glibc/include/
---------------------------------------------------
Using built-in specs.
COLLECT_GCC=g++
Target: x86_64-suse-linux
Configured with: ../gcc-7.3.0/configure --prefix=/FaF --infodir=/FaF/share/info
--mandir=/FaF/share/man --libdir=/FaF/lib64 --libexecdir=/FaF/lib64
--enable-languages=c,c++ --enable-checking=release --with-gmp=/FaF/
--with-mpfr=/FaF --with-gmc=/FaF --with-gxx-include-dir=/FaF/include/c++/7.3
--enable-ssp --disable-libssp --disable-plugin
--with-bugurl=http://bugs.opensuse.org/--with-pkgversion='SUSE Linux'
--disable-libgcj --disable-libmudflap --with-slibdir=/lib64 --with-system-zlib
--enable-__cxa_atexit --enable-libstdcxx-allocator=new --disable-libstdcxx-pch
--enable-version-specific-runtime-libs --enable-linker-build-id
--enable-linux-futex --program-suffix=-7.3 --without-system-libunwind
--with-arch-32=i586 --with-tune=generic --build=x86_64-suse-linux
--host=x86_64-suse-linux --disable-multilib
Thread model: posix
gcc version 7.3.0 (SUSE Linux)
COLLECT_GCC_OPTIONS='-E' '-v' '-I' '/FaF/glibc/include/' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
/FaF/lib64/gcc/x86_64-suse-linux/7.3.0/cc1plus -E -quiet -v -I
/FaF/glibc/include/ -D_GNU_SOURCE - -mtune=generic -march=x86-64
ignoring nonexistent directory
"/FaF/lib64/gcc/x86_64-suse-linux/7.3.0/../../../../x86_64-suse-linux/include"
#include "..." search starts here:
#include <...> search starts here:
/FaF/glibc/include/
/FaF/include/c++/7.3
/FaF/include/c++/7.3/x86_64-suse-linux
/FaF/include/c++/7.3/backward
/FaF/lib64/gcc/x86_64-suse-linux/7.3.0/include
/usr/local/include
/FaF/include
/FaF/lib64/gcc/x86_64-suse-linux/7.3.0/include-fixed
/usr/include
End of search list.
First error lines - for some reasons g++ starts to use the g++ starts to use
the g++ 4.8.5 - which is installed on the system - include path.
In file included from /usr/include/math.h:48:0,
from /FaF/include/c++/7.3/cmath:45,
from foo.cpp:11:
/FaF/glibc/include/bits/mathdef.h:19:3: error: #error "Never use
<bits/mathdef.h> directly; include <complex.h> instead"
# error "Never use <bits/mathdef.h> directly; include <complex.h> instead"
^~~~~
In file included from /FaF/include/c++/7.3/cstdlib:75:0,
from foo.cpp:10:
/usr/include/stdlib.h:95:1: error: ‘__BEGIN_NAMESPACE_STD’ does not name a
type; did you mean ‘__BEGIN_DECLS’?
__BEGIN_NAMESPACE_STD
^~~~~~~~~~~~~~~~~~~~~
__BEGIN_DECLS
/usr/include/stdlib.h:101:5: error: ‘div_t’ does not name a type; did you mean
‘size_t’?
} div_t;
^~~~~
>From gcc-bugs-return-596472-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 23:21:09 2018
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Subject: [Bug c++/84744] cannot use glibc 2.27 with gcc 7.3
Date: Tue, 06 Mar 2018 23:21:00 -0000
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>-I /FaF/glibc/include
Use -isystem instead or a true sysroot instead.
>From gcc-bugs-return-596474-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 23:32:00 2018
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Subject: [Bug c++/84744] cannot use glibc 2.27 with gcc 7.3
Date: Tue, 06 Mar 2018 23:31:00 -0000
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--- Comment #3 from Peter VARGA <development@faf-ltd.com> ---
(In reply to Andrew Pinski from comment #1)
> >-I /FaF/glibc/include
>
> Use -isystem instead or a true sysroot instead.
Sorry, but this does not help.
>From gcc-bugs-return-596473-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 23:31:28 2018
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Subject: [Bug c++/84744] cannot use glibc 2.27 with gcc 7.3
Date: Tue, 06 Mar 2018 23:31:00 -0000
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--- Comment #2 from Peter VARGA <development@faf-ltd.com> ---
Sorry, but this does not help.
>From gcc-bugs-return-596475-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 23:44:18 2018
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Subject: [Bug c++/84744] cannot use glibc 2.27 with gcc 7.3
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--- Comment #4 from Peter VARGA <development@faf-ltd.com> ---
(In reply to Andrew Pinski from comment #1)
> >-I /FaF/glibc/include
>
> Use -isystem instead or a true sysroot instead.
Can you post the full g++ command line options how you mean it?
>From gcc-bugs-return-596477-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 23:50:39 2018
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Subject: [Bug fortran/66128] ICE for some intrinsics with zero sized array parameter
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66128
--- Comment #15 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Tue Mar 6 23:50:01 2018
New Revision: 258305
URL: https://gcc.gnu.org/viewcvs?rev=258305&root=gcc&view=rev
Log:
2017-03-06 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/84697
PR fortran/66128
* expr.c (simplify_parameter_variable): If p is a size zero array
and not an ARRAY_EXPR insert an empty array constructor and
return.
* gfortran.h: Add prototype for gfc_is_size_zero_array.
* simplify.c (is_size_zero_array): Make non-static and rename into
(gfc_is_size_zero_array): Check for parameter arrays of zero
size by comparing shape and absence of constructor.
(gfc_simplify_all): Use gfc_is_size_zero_array instead of
is_size_zero_array.
(gfc_simplify_count): Likewise.
(gfc_simplify_iall): Likewise.
(gfc_simplify_iany): Likewise.
(gfc_simplify_iparity): Likewise.
(gfc_simplify_minval): Likewise.
(gfc_simplify_maxval): Likewise.
(gfc_simplify_product): Likewise.
(gfc_simplify_sum): Likewise.
2017-03-06 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/84697
PR fortran/66128
* gfortran.dg/minmaxloc_zerosize_1.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/minmaxloc_zerosize_1.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/expr.c
trunk/gcc/fortran/gfortran.h
trunk/gcc/fortran/simplify.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-596476-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 23:50:39 2018
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Subject: [Bug fortran/84697] [8 Regression] minloc/maxloc not simplified with zero size
Date: Tue, 06 Mar 2018 23:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84697
--- Comment #5 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Tue Mar 6 23:50:01 2018
New Revision: 258305
URL: https://gcc.gnu.org/viewcvs?rev=258305&root=gcc&view=rev
Log:
2017-03-06 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/84697
PR fortran/66128
* expr.c (simplify_parameter_variable): If p is a size zero array
and not an ARRAY_EXPR insert an empty array constructor and
return.
* gfortran.h: Add prototype for gfc_is_size_zero_array.
* simplify.c (is_size_zero_array): Make non-static and rename into
(gfc_is_size_zero_array): Check for parameter arrays of zero
size by comparing shape and absence of constructor.
(gfc_simplify_all): Use gfc_is_size_zero_array instead of
is_size_zero_array.
(gfc_simplify_count): Likewise.
(gfc_simplify_iall): Likewise.
(gfc_simplify_iany): Likewise.
(gfc_simplify_iparity): Likewise.
(gfc_simplify_minval): Likewise.
(gfc_simplify_maxval): Likewise.
(gfc_simplify_product): Likewise.
(gfc_simplify_sum): Likewise.
2017-03-06 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/84697
PR fortran/66128
* gfortran.dg/minmaxloc_zerosize_1.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/minmaxloc_zerosize_1.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/expr.c
trunk/gcc/fortran/gfortran.h
trunk/gcc/fortran/simplify.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-596479-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 06 23:51:56 2018
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Subject: [Bug fortran/84697] [8 Regression] minloc/maxloc not simplified with zero size
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Fixed on trunk, closing.
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Subject: [Bug fortran/66128] ICE for some intrinsics with zero sized array parameter
Date: Tue, 06 Mar 2018 23:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66128
Bug 66128 depends on bug 84697, which changed state.
Bug 84697 Summary: [8 Regression] minloc/maxloc not simplified with zero size
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84697
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
>From gcc-bugs-return-596480-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 00:17:29 2018
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Subject: [Bug debug/84550] [8 Regression] stepping through gcc does not work with gdb 8.0.1
Date: Wed, 07 Mar 2018 00:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84550
--- Comment #11 from Kevin Buettner <kevinb at redhat dot com> ---
I've simplified Jakub's example slightly:
--- vau2.c ---
struct A { int a; };
struct B { struct A *b; };
struct C { struct B *c; };
__attribute__((noipa)) bool
foo (struct A *p)
{
return false;
}
__attribute__((noipa)) int
baz (int x)
{
return 0;
}
__attribute__((noipa)) void
qux (struct C *p)
{
struct A *a;
bool b;
int c;
if (!p->c) __builtin_abort ();
a = p->c->b;
b = (a->a == 4)
&& (foo (a));
c = baz (0);
baz (b);
}
int
main ()
{
struct A a = { 4 };
struct B b = { &a };
struct C c = { &b };
qux (&c);
return 0;
}
--- end vau2.c ---
When I compile this via "g++ -O2 -g vau2.c -o vau2", and load it into gdb, it
exhibits the same behavior shown by Jakub. I.e. the following sequence...
b qux
run
s
s
s
... does not stop in foo as expected. The program instead exits.
It turns out that qux consists of two disjoint pieces which, for some reason,
are separated by a lot of other code, e.g. main, _start, foo, baz, and a lot of
other stuff too. Here's what it looks like:
0x400460 <qux(C*)>: callq 0x400430 <abort@plt>
0x400465: nopw %cs:0x0(%rax,%rax,1)
0x40046f: nop
0x400470 <main()>: sub $0x28,%rsp
0x400474 <main()+4>: lea 0xc(%rsp),%rax
0x400479 <main()+9>: lea 0x18(%rsp),%rdi
0x40047e <main()+14>: movl $0x4,0xc(%rsp)
0x400486 <main()+22>: mov %rax,0x10(%rsp)
0x40048b <main()+27>: lea 0x10(%rsp),%rax
0x400490 <main()+32>: mov %rax,0x18(%rsp)
0x400495 <main()+37>: callq 0x4005b0 <_Z3quxP1C>
0x40049a <main()+42>: xor %eax,%eax
0x40049c <main()+44>: add $0x28,%rsp
0x4004a0 <main()+48>: retq
0x4004a1: nopw %cs:0x0(%rax,%rax,1)
0x4004ab: nopl 0x0(%rax,%rax,1)
0x4004b0 <_start>: xor %ebp,%ebp
0x4004b2 <_start+2>: mov %rdx,%r9
0x4004b5 <_start+5>: pop %rsi
0x4004b6 <_start+6>: mov %rsp,%rdx
0x4004b9 <_start+9>: and $0xfffffffffffffff0,%rsp
0x4004bd <_start+13>: push %rax
0x4004be <_start+14>: push %rsp
0x4004bf <_start+15>: mov $0x400660,%r8
0x4004c6 <_start+22>: mov $0x4005f0,%rcx
0x4004cd <_start+29>: mov $0x400470,%rdi
0x4004d4 <_start+36>: callq 0x400440 <__libc_start_main@plt>
0x4004d9 <_start+41>: hlt
...
0x400590 <foo(A*)>: xor %eax,%eax
0x400592 <foo(A*)+2>: retq
0x400593: nopl (%rax)
0x400596: nopw %cs:0x0(%rax,%rax,1)
0x4005a0 <baz(int)>: xor %eax,%eax
0x4005a2 <baz(int)+2>: retq
0x4005a3: nopl (%rax)
0x4005a6: nopw %cs:0x0(%rax,%rax,1)
0x4005b0 <_Z3quxP1C>: push %rbx
0x4005b1 <_Z3quxP1C+1>: mov (%rdi),%rax
0x4005b4 <_Z3quxP1C+4>: test %rax,%rax
0x4005b7 <_Z3quxP1C+7>: je 0x400460 <qux(C*)>
0x4005bd <_Z3quxP1C+13>: mov (%rax),%rdi
0x4005c0 <_Z3quxP1C+16>: xor %ebx,%ebx
0x4005c2 <_Z3quxP1C+18>: cmpl $0x4,(%rdi)
0x4005c5 <_Z3quxP1C+21>: je 0x4005d8 <_Z3quxP1C+40>
0x4005c7 <_Z3quxP1C+23>: xor %edi,%edi
0x4005c9 <_Z3quxP1C+25>: callq 0x4005a0 <baz(int)>
0x4005ce <_Z3quxP1C+30>: mov %ebx,%edi
0x4005d0 <_Z3quxP1C+32>: pop %rbx
0x4005d1 <_Z3quxP1C+33>: jmp 0x4005a0 <baz(int)>
0x4005d3 <_Z3quxP1C+35>: nopl 0x0(%rax,%rax,1)
0x4005d8 <_Z3quxP1C+40>: callq 0x400590 <foo(A*)>
0x4005dd <_Z3quxP1C+45>: xor %edi,%edi
0x4005df <_Z3quxP1C+47>: movzbl %al,%ebx
0x4005e2 <_Z3quxP1C+50>: callq 0x4005a0 <baz(int)>
0x4005e7 <_Z3quxP1C+55>: mov %ebx,%edi
0x4005e9 <_Z3quxP1C+57>: pop %rbx
0x4005ea <_Z3quxP1C+58>: jmp 0x4005a0 <baz(int)>
0x4005ec: nopl 0x0(%rax)
Within GDB, this is where things go wrong:
top-gdb> bt 4
#0 find_pc_partial_function_gnu_ifunc (pc=4195728, name=0x7fffffffdd28,
address=0x7fffffffdd18, endaddr=0x7fffffffdd20, is_gnu_ifunc_p=0x0)
at
/ironwood1/sourceware-git/mesquite-native-thread_handle_to_thread_info/bld/../../binutils-gdb/gdb/blockframe.c:213
#1 0x0000000000553281 in find_pc_partial_function (pc=4195728,
name=0x7fffffffdd28, address=0x7fffffffdd18, endaddr=0x7fffffffdd20)
at
/ironwood1/sourceware-git/mesquite-native-thread_handle_to_thread_info/bld/../../binutils-gdb/gdb/blockframe.c:323
#2 0x00000000006b6aec in fill_in_stop_func (gdbarch=0x1249170,
ecs=0x7fffffffdcd0)
at
/ironwood1/sourceware-git/mesquite-native-thread_handle_to_thread_info/bld/../../binutils-gdb/gdb/infrun.c:4303
#3 0x00000000006baf13 in process_event_stop_test (ecs=0x7fffffffdcd0)
at
/ironwood1/sourceware-git/mesquite-native-thread_handle_to_thread_info/bld/../../binutils-gdb/gdb/infrun.c:6494
That pc value is actually the first address for foo(), which is what we want:
top-gdb> p/x pc
$22 = 0x400590
(Refer to my disassembly above to verify this.)
This code, which is in find_pc_partial_function_gnu_ifunc(), incorrectly
identifies this address, 0x400590, as belonging to qux:
if (mapped_pc >= cache_pc_function_low
&& mapped_pc < cache_pc_function_high
&& section == cache_pc_function_section)
goto return_cached_value;
top-gdb> p/x cache_pc_function_low
$30 = 0x400460
top-gdb> p/x cache_pc_function_high
$31 = 0x4005ec
Note that these high and low addresses include not only qux, but foo, baz,
main, and _start. This is due to the fact that qux consists of two separate
parts separated by a lot of other code.
So far as I can tell, prologue analysis is not at fault here.
I'm now trying to figure out how this might be fixed.
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Subject: [Bug debug/84550] [8 Regression] stepping through gcc does not work with gdb 8.0.1
Date: Wed, 07 Mar 2018 00:25:00 -0000
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--- Comment #12 from Kevin Buettner <kevinb at redhat dot com> ---
I'll note, too, that just setting a breakpoint on qux and then looking at the
locations reveals another problem...
(gdb) b qux
Breakpoint 1 at 0x400460: qux. (2 locations)
(gdb) info break
Num Type Disp Enb Address What
1 breakpoint keep y <MULTIPLE>
1.1 y 0x0000000000400460 in qux(C*) at vau2.c:24
1.2 y 0x00000000004005b0 in qux(C*) at vau2.c:24
(gdb) x/4i 0x400460
0x400460 <qux(C*)>: callq 0x400430 <abort@plt>
0x400465: nopw %cs:0x0(%rax,%rax,1)
0x40046f: nop
0x400470 <main()>: sub $0x28,%rsp
(gdb) x/4i 0x4005b0
0x4005b0 <_Z3quxP1C>: push %rbx
0x4005b1 <_Z3quxP1C+1>: mov (%rdi),%rax
0x4005b4 <_Z3quxP1C+4>: test %rax,%rax
0x4005b7 <_Z3quxP1C+7>: je 0x400460 <qux(C*)>
Placing a breakpoint on 0x400460 is incorrect since this is not an actual entry
point to the function.
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Subject: [Bug fortran/64107] [F95] Pure function as array size
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--- Comment #2 from kargl at gcc dot gnu.org ---
Author: kargl
Date: Wed Mar 7 00:25:30 2018
New Revision: 258311
URL: https://gcc.gnu.org/viewcvs?rev=258311&root=gcc&view=rev
Log:
2018-03-06 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/64107
* gfortran.dg/pr64107.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/pr64107.f90
Modified:
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/32834] [Meta-bug] 'Fortran 95'-only failures
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Bug 32834 depends on bug 64107, which changed state.
Bug 64107 Summary: [F95] Pure function as array size
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64107
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug fortran/64107] [F95] Pure function as array size
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |8.0
--- Comment #3 from kargl at gcc dot gnu.org ---
Closing as fixed on trunk. Thanks for bug report.
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Subject: [Bug debug/84550] [8 Regression] stepping through gcc does not work with gdb 8.0.1
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--- Comment #13 from Kevin Buettner <kevinb at redhat dot com> ---
(In reply to Kevin Buettner from comment #11)
> This code, which is in find_pc_partial_function_gnu_ifunc(), incorrectly
> identifies this address, 0x400590, as belonging to qux:
>
> if (mapped_pc >= cache_pc_function_low
> && mapped_pc < cache_pc_function_high
> && section == cache_pc_function_section)
> goto return_cached_value;
I've determined that if this code is disabled, then things work. I'm not
suggesting this as a fix, just adding another data point.
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Subject: [Bug fortran/57197] [Fortran-Dev][Regression] ICE in record_reference, at cgraphbuild.c:66
Date: Wed, 07 Mar 2018 03:39:00 -0000
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kargl at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
Status|NEW |WAITING
CC| |kargl at gcc dot gnu.org
--- Comment #3 from kargl at gcc dot gnu.org ---
The code in comment one compiles without a problem.
Can this be closed as fixed.
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Subject: [Bug fortran/56818] [meta-bug] fortran-dev bugs
Date: Wed, 07 Mar 2018 06:53:00 -0000
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Bug 56818 depends on bug 57197, which changed state.
Bug 57197 Summary: [Fortran-Dev][Regression] ICE in record_reference, at cgraphbuild.c:66
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57197
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----------------------------------------------------------------------------
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Subject: [Bug fortran/57197] [Fortran-Dev][Regression] ICE in record_reference, at cgraphbuild.c:66
Date: Wed, 07 Mar 2018 06:53:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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----------------------------------------------------------------------------
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Blocks| |56818
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--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> The code in comment one compiles without a problem.
> Can this be closed as fixed.
It even compiles with fortran-dev revision 240290 (2016-09-19).
Closing.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56818
[Bug 56818] [meta-bug] fortran-dev bugs
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Subject: [Bug c++/84745] New: internal compiler error: Segmentation fault (main_block_label())
Date: Wed, 07 Mar 2018 07:21:00 -0000
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Bug ID: 84745
Summary: internal compiler error: Segmentation fault
(main_block_label())
Product: gcc
Version: 8.0.1
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Priority: P3
Component: c++
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CC: webrown.cpp at gmail dot com
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Input:
void a() {
alignof(({
b: 0;
}));
goto b;
}
Output:
$ xgcc -x c++ -S -
during GIMPLE pass: cfg
<stdin>: In function 'void a()':
<stdin>:1:6: internal compiler error: Segmentation fault
0x3152ce9 crash_signal
/home/vegard/git/gcc/gcc/toplev.c:325
0x32834db main_block_label
/home/vegard/git/gcc/gcc/tree-cfg.c:1496
0x3292fff cleanup_dead_labels()
/home/vegard/git/gcc/gcc/tree-cfg.c:1679
0x32f0b70 build_gimple_cfg
/home/vegard/git/gcc/gcc/tree-cfg.c:240
0x32f0b70 execute_build_cfg
/home/vegard/git/gcc/gcc/tree-cfg.c:410
0x32f0b70 execute
/home/vegard/git/gcc/gcc/tree-cfg.c:446
$ xgcc --version
xgcc (GCC) 8.0.1 20180306 (experimental)
Built from git 11a93d7a09b871b3b9a2eb108eb91ad83d94e070 (r258271).
Funnily, clang also segfaults on this exact input.
Test case was minimised by C-Reduce.
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Subject: [Bug c++/84744] cannot use glibc 2.27 with gcc 7.3
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--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> ---
That's not how you use a different glibc. If you look at the include order
printed by -v, it has to remain in that order (libstdc++ before glibc, in
particular), whereas you are adding your glibc in front. Best would be to
recompile gcc, which has the added advantage that it will be able to take
advantage of the new features in the new glibc this way.
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Subject: [Bug c++/84744] cannot use glibc 2.27 with gcc 7.3
Date: Wed, 07 Mar 2018 07:50:00 -0000
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--- Comment #6 from Peter VARGA <development@faf-ltd.com> ---
(In reply to Marc Glisse from comment #5)
> That's not how you use a different glibc. If you look at the include order
> printed by -v, it has to remain in that order (libstdc++ before glibc, in
> particular), whereas you are adding your glibc in front. Best would be to
> recompile gcc, which has the added advantage that it will be able to take
> advantage of the new features in the new glibc this way.
May be for you all is clear but I am not in the gnu gcc developer team and I am
using only gcc. Therefore I don't really understand what I should do. You all
give just half of some hints and they don't even work.
What should I do different when I recompile gcc?
This works - but why should I do it? Why is g++ using the path /usr/include
BEFORE the others and this is the problem! gcc does NOT keep the include order.
g++ foo.cpp -o foo -nostdinc -I /FaF/include/c++/7.3 -I
/FaF/include/c++/7.3/x86_64-suse-linux/ -I /FaF/glibc/include/ -I
/FaF/lib64/gcc/x86_64-suse-linux/7.3.0/include
In /FaF is my gcc 7.3 and in /FaF/glibc is glibc 2.27
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Subject: [Bug c++/84684] inserting random code / flags produces wrong code
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--- Comment #18 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Wed Mar 7 07:50:57 2018
New Revision: 258313
URL: https://gcc.gnu.org/viewcvs?rev=258313&root=gcc&view=rev
Log:
PR c++/84684
* constexpr.c (cxx_bind_parameters_in_call): Unshare evaluated
arguments.
* g++.dg/cpp1z/constexpr-84684.C: New test.
Added:
branches/gcc-7-branch/gcc/testsuite/g++.dg/cpp1z/constexpr-84684.C
Modified:
branches/gcc-7-branch/gcc/cp/ChangeLog
branches/gcc-7-branch/gcc/cp/constexpr.c
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Subject: [Bug c++/84684] inserting random code / flags produces wrong code
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #19 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug tree-optimization/84746] New: ICE on valid code at -O2 and -O3: Segmentation fault
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84746
Bug ID: 84746
Summary: ICE on valid code at -O2 and -O3: Segmentation fault
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
Target Milestone: ---
$ gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/home/su/software/tmp/gcc/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/8.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/home/su/software/tmp/gcc/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 8.0.1 20180307 (experimental) [trunk revision 258312] (GCC)
$
$ gcctk -Os -c small.c
$ gcc-7.2.0 -O2 -c small.c
$
$ gcctk -O2 -c small.c
during GIMPLE pass: pre
small.c: In function ‘fn1’:
small.c:4:6: internal compiler error: Segmentation fault
void fn1 ()
^~~
0xca7f6f crash_signal
../../gcc-source-trunk/gcc/toplev.c:325
0xedd700 update_dep_bb
../../gcc-source-trunk/gcc/tree-ssa-tail-merge.c:402
0xedfbf9 same_succ_hash
../../gcc-source-trunk/gcc/tree-ssa-tail-merge.c:506
0xedfbf9 find_same_succ_bb
../../gcc-source-trunk/gcc/tree-ssa-tail-merge.c:717
0xee00ff find_same_succ
../../gcc-source-trunk/gcc/tree-ssa-tail-merge.c:748
0xee00ff init_worklist
../../gcc-source-trunk/gcc/tree-ssa-tail-merge.c:767
0xee00ff tail_merge_optimize(unsigned int)
../../gcc-source-trunk/gcc/tree-ssa-tail-merge.c:1733
0xe7c6b6 execute
../../gcc-source-trunk/gcc/tree-ssa-pre.c:4196
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$
--------------------------------------------------
int a, b, c, d, e;
char f, g;
void fn1 ()
{
while (1)
{
if (d)
goto L1;
if (e)
goto L3;
int q = (c && a) % (f * (d || a)) && b;
e = q;
if (b)
break;
L1:
L2:
c = f;
L3:
f = g;
while (a)
goto L2;
}
}
>From gcc-bugs-return-596495-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 08:07:03 2018
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Subject: [Bug tree-optimization/84746] [8 Regression] ICE on valid code at -O2 and -O3: Segmentation fault
Date: Wed, 07 Mar 2018 08:07:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-07
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |8.0
Summary|ICE on valid code at -O2 |[8 Regression] ICE on valid
|and -O3: Segmentation fault |code at -O2 and -O3:
| |Segmentation fault
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-596496-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 08:08:34 2018
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Subject: [Bug tree-optimization/84746] [8 Regression] ICE on valid code at -O2 and -O3: Segmentation fault
Date: Wed, 07 Mar 2018 08:08:00 -0000
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r258124.
>From gcc-bugs-return-596497-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 08:18:59 2018
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Subject: [Bug c++/79937] [6/7/8 Regression] ICE in replace_placeholders_r
Date: Wed, 07 Mar 2018 08:18:00 -0000
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--- Comment #18 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
struct Y
{
static Y bar (Y y) { return y; }
int i;
int n = bar (Y{2,i}).m + bar {Y{2,i,i}).n;
int m = i;
};
is rejected, so I can't find a counter-example where PLACEHOLDER_EXPRs for
different objects would be intermixed in the same CONSTRUCTOR (assuming there
must be a CONSTRUCTOR).
>From gcc-bugs-return-596498-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 08:33:27 2018
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Subject: [Bug lto/84592] [openacc,openmp] lto1: ICE in input_varpool_node, at lto-cgraph.c:1424: for CSWTCH symbol
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--- Comment #8 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #7)
> Created attachment 43571 [details]
> Tentative patch
>
> Works on nvptx for the examples from comment 0, comment 3 and comment 5.
Tested libgomp on x86_64 with nvptx accelerator, no issues found.
Now doing bootstrap and reg-test on x86_64.
>From gcc-bugs-return-596499-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 08:33:51 2018
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Subject: [Bug lto/84592] [openacc,openmp] lto1: ICE in input_varpool_node, at lto-cgraph.c:1424: for CSWTCH symbol
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--- Comment #9 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #6)
> Looks like a duplicate of PR71536
Actually, this is not fixed by the patch, so likely another issue.
>From gcc-bugs-return-596500-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 08:52:39 2018
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Subject: [Bug tree-optimization/84739] [6/7/8 Regression] ICE in get_value_for_expr, at tree-ssa-ccp.c:649
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43582
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43582&action=edit
gcc8-pr84739.patch
Untested fix. With different gimple_call_fntype the ICE doesn't reproduce,
because if there is a mismatch between func's DECL_ARGUMENTS and the actual
arguments, the current code already rejects it as tail recursion. In the past,
there used to be if (func == current_function_decl) condition and so what we
picked DECL_ARGUMENTS from didn't really matter, but now with the
recursive_call_p check it does.
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Subject: [Bug target/84565] [8 Regression] ICE in extract_insn, at recog.c:2304 on aarch64
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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URL| |https://gcc.gnu.org/ml/gcc-
| |patches/2018-02/msg01484.ht
| |ml
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Subject: [Bug tree-optimization/84746] [8 Regression] ICE on valid code at -O2 and -O3: Segmentation fault
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
We are calling update_dep_bb on a in-freelist SSA_NAME.
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Subject: [Bug tree-optimization/84746] [8 Regression] ICE on valid code at -O2 and -O3: Segmentation fault
Date: Wed, 07 Mar 2018 09:02:00 -0000
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The SSA_NAME has been freed in:
#1 0x0000000001291cfd in release_ssa_name_fn (fn=0x7fffefd9b000,
var=<error_mark 0x7fffefda75a0>) at ../../gcc/tree-ssanames.c:579
#2 0x00000000010b76eb in release_ssa_name (name=<error_mark 0x7fffefda75a0>)
at ../../gcc/tree-ssanames.h:141
#3 0x00000000010b8590 in remove_phi_node (gsi=0x7fffffffdb50,
release_lhs_p=true) at ../../gcc/tree-phinodes.c:449
#4 0x0000000001221501 in vn_eliminate (inserted_exprs=0x2b51008) at
../../gcc/tree-ssa-sccvn.c:5928
#5 0x00000000011e94a2 in (anonymous namespace)::pass_pre::execute
(this=0x2ae9720, fun=0x7fffefd9b000) at ../../gcc/tree-ssa-pre.c:4173
#6 0x0000000000e735c5 in execute_one_pass (pass=<opt_pass* 0x2ae9720
"pre"(139)>) at ../../gcc/passes.c:2497
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Subject: [Bug tree-optimization/84746] [8 Regression] ICE on valid code at -O2 and -O3: Segmentation fault
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine.
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Subject: [Bug debug/84550] [8 Regression] stepping through gcc does not work with gdb 8.0.1
Date: Wed, 07 Mar 2018 09:11:00 -0000
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--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
In addition to reordering basic blocks in the compiled function, in
order to reduce number of taken branches, partitions hot and cold
basic blocks into separate sections of the assembly and '.o' files,
to improve paging and cache locality performance.
is what we say about -freorder-blocks-and-partition in the documentation, when
functions are normally placed in .text section rather than anything different,
the cold basic blocks go into .text.cold subsection and the linker merges all
those cold subsections from all objects into one part of the resulting .text
section, so unlikely used code from all the functions is adjacent and hot code
from all of them elsewhere too. The cold partition could end up either below
or above the hot partition, it is purely up to the linker to decide that.
As written above, the real entrypoint to the function can be found in DWARF by
checking DW_AT_entry_pc if it exists, or if it doesn't, as the base address of
the function which is the lowest address of the first range if it has
DW_AT_ranges, or if it has DW_AT_{low,high}_pc as the DW_AT_low_pc.
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Subject: [Bug target/84209] [avr] Don't split SP in split2
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--- Comment #3 from denisc at gcc dot gnu.org ---
Author: denisc
Date: Wed Mar 7 09:13:12 2018
New Revision: 258315
URL: https://gcc.gnu.org/viewcvs?rev=258315&root=gcc&view=rev
Log:
Backport from mainline
2018-02-07 Georg-Johann Lay <avr@gjlay.de>
PR target/84209
* config/avr/avr.h (GENERAL_REGNO_P, GENERAL_REG_P): New macros.
* config/avr/avr.md: Only post-reload split REG-REG moves if
either register is GENERAL_REG_P.
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/config/avr/avr.h
branches/gcc-7-branch/gcc/config/avr/avr.md
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Subject: [Bug tree-optimization/84739] [6/7/8 Regression] ICE in get_value_for_expr, at tree-ssa-ccp.c:649
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Subject: [Bug target/84741] [7/8 Regression] ICE in ix86_expand_prologue, at config/i386/i386.c:13893
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug debug/84736] When compiling with -g -O2 internal compiler error: in force_type_die, at dwarf2out.c:25111
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |needs-bisection,
| |needs-reduction
Known to work| |7.3.0
Known to fail| |7.2.0
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed with GCC 7.2, but fixed with GCC 7.3. needs reduction / bisection to
see if sth was really fixed or the issue just has gone latent.
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Subject: [Bug tree-optimization/84740] [8 Regression] ICE in build_constructors, at tree-switch-conversion.c:965
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Subject: [Bug middle-end/84723] [8 Regression] ICE in create_target_clone, at multiple_target.c:275
Date: Wed, 07 Mar 2018 09:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84723
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Mar 7 09:16:07 2018
New Revision: 258316
URL: https://gcc.gnu.org/viewcvs?rev=258316&root=gcc&view=rev
Log:
PR middle-end/84723
* multiple_target.c: Include tree-inline.h and intl.h.
(expand_target_clones): Diagnose and fail if node->definition and
!tree_versionable_function_p (node->decl).
* gcc.target/i386/pr84723-1.c: New test.
* gcc.target/i386/pr84723-2.c: New test.
* gcc.target/i386/pr84723-3.c: New test.
* gcc.target/i386/pr84723-4.c: New test.
* gcc.target/i386/pr84723-5.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/pr84723-1.c
trunk/gcc/testsuite/gcc.target/i386/pr84723-2.c
trunk/gcc/testsuite/gcc.target/i386/pr84723-3.c
trunk/gcc/testsuite/gcc.target/i386/pr84723-4.c
trunk/gcc/testsuite/gcc.target/i386/pr84723-5.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/multiple_target.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/84704] [8 Regression] internal compiler error: gimplification failed
Date: Wed, 07 Mar 2018 09:21:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84704
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Mar 7 09:19:36 2018
New Revision: 258317
URL: https://gcc.gnu.org/viewcvs?rev=258317&root=gcc&view=rev
Log:
PR c++/84704
* gimple-expr.c (create_tmp_var_raw): Set DECL_NAMELESS flag
on tmp_var.
* tree-pretty-print.c (dump_decl_name): For TDF_COMPARE_DEBUG,
don't print names of DECL_NAMELESS DECL_IGNORED_P decls.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/gimple-expr.c
trunk/gcc/tree-pretty-print.c
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84743] default widths for parallel reassociation now hurt rather than help
Date: Wed, 07 Mar 2018 09:25:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
That sounds odd... can you try analyzing at least one case (520.omnetpp_r?)?
Does reassoc width still help SPEC CPU 2006 (which is what I suppose you
used for gcc7 testing?)
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Subject: [Bug lto/83954] [6/7 Regression] LTO: Bogus -Wlto-type-mismatch warning for array of pointer to incomplete type
Date: Wed, 07 Mar 2018 09:43:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83954
--- Comment #16 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Mar 7 09:43:23 2018
New Revision: 258319
URL: https://gcc.gnu.org/viewcvs?rev=258319&root=gcc&view=rev
Log:
Backport r257183
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-01-30 Jan Hubicka <hubicka@ucw.cz>
PR lto/83954
* lto-symtab.c (warn_type_compatibility_p): Silence false positive
for type match warning on arrays of pointers.
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-01-30 Jan Hubicka <hubicka@ucw.cz>
PR lto/83954
* gcc.dg/lto/pr83954.h: New testcase.
* gcc.dg/lto/pr83954_0.c: New testcase.
* gcc.dg/lto/pr83954_1.c: New testcase.
Added:
branches/gcc-6-branch/gcc/testsuite/gcc.dg/lto/pr83954.h
branches/gcc-6-branch/gcc/testsuite/gcc.dg/lto/pr83954_0.c
branches/gcc-6-branch/gcc/testsuite/gcc.dg/lto/pr83954_1.c
Modified:
branches/gcc-6-branch/gcc/lto/ChangeLog
branches/gcc-6-branch/gcc/lto/lto-symtab.c
branches/gcc-6-branch/gcc/testsuite/ChangeLog
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Subject: [Bug lto/83954] [6/7 Regression] LTO: Bogus -Wlto-type-mismatch warning for array of pointer to incomplete type
Date: Wed, 07 Mar 2018 09:44:00 -0000
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--- Comment #17 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Mar 7 09:43:49 2018
New Revision: 258320
URL: https://gcc.gnu.org/viewcvs?rev=258320&root=gcc&view=rev
Log:
Backport r257343
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-02 Eric Botcazou <ebotcazou@adacore.com>
PR lto/83954
* lto-symtab.c (warn_type_compatibility_p): Do not recurse into the
component type of array types with non-aliased component.
Modified:
branches/gcc-6-branch/gcc/lto/ChangeLog
branches/gcc-6-branch/gcc/lto/lto-symtab.c
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Subject: [Bug lto/81004] [7 Regression] linking failed with -flto and static libboost_program_options
Date: Wed, 07 Mar 2018 09:44:00 -0000
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--- Comment #28 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Mar 7 09:44:03 2018
New Revision: 258321
URL: https://gcc.gnu.org/viewcvs?rev=258321&root=gcc&view=rev
Log:
Backport r257412
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-01-30 Jan Hubicka <hubicka@ucw.cz>
PR lto/81004
* lto.c: Include builtins.h
(register_resolution): Merge resolutions in case trees was
merged across units.
(lto_maybe_register_decl): Break out from ...
(lto_read_decls): ... here.
(unify_scc): Also register decls here.
(read_cgraph_and_symbols): Sanity check that all resolutions was
read.
Modified:
branches/gcc-6-branch/gcc/lto/ChangeLog
branches/gcc-6-branch/gcc/lto/lto.c
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Subject: [Bug c/84229] A valid code rejected with -flto
Date: Wed, 07 Mar 2018 09:46:00 -0000
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--- Comment #12 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Mar 7 09:46:01 2018
New Revision: 258324
URL: https://gcc.gnu.org/viewcvs?rev=258324&root=gcc&view=rev
Log:
Backport r257877
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-21 Jan Hubicka <hubicka@ucw.cz>
PR c/84229
* ipa-cp.c (determine_versionability): Do not version functions caling
va_arg_pack.
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/ipa-cp.c
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/81360] [8 Regression] ice in estimate_edge_growth, at ipa-inline.h:86
Date: Wed, 07 Mar 2018 09:46:00 -0000
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--- Comment #18 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Mar 7 09:45:44 2018
New Revision: 258323
URL: https://gcc.gnu.org/viewcvs?rev=258323&root=gcc&view=rev
Log:
Backport r257490
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-08 Jan Hubicka <hubicka@ucw.cz>
PR ipa/81360
* cgraph.h (symtab_node::output_to_lto_symbol_table_p): Declare
* symtab.c: Include builtins.h
(symtab_node::output_to_lto_symbol_table_p): Move here
from lto-streamer-out.c:output_symbol_p.
* lto-streamer-out.c (write_symbol): Turn early exit to assert.
(output_symbol_p): Move all logic to symtab.c
(produce_symtab): Update.
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-08 Jan Hubicka <hubicka@ucw.cz>
PR ipa/81360
* lto.c (unify_scc): Register prevailing trees, not trees to be freed.
(read_cgraph_and_symbols): Use
symtab_node::output_to_lto_symbol_table_p.
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/cgraph.h
branches/gcc-6-branch/gcc/lto-streamer-out.c
branches/gcc-6-branch/gcc/lto/ChangeLog
branches/gcc-6-branch/gcc/lto/lto.c
branches/gcc-6-branch/gcc/symtab.c
branches/gcc-6-branch/gcc/tree.c
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Subject: [Bug rtl-optimization/82675] ICE in duplicate_loop_to_header_edge at gcc/cfgloopmanip.c:1207
Date: Wed, 07 Mar 2018 09:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82675
--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Mar 7 09:47:11 2018
New Revision: 258327
URL: https://gcc.gnu.org/viewcvs?rev=258327&root=gcc&view=rev
Log:
Backport r255818
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2017-12-19 Martin Liska <mliska@suse.cz>
PR rtl-optimization/82675
* loop-unroll.c (unroll_loop_constant_iterations): Allocate one
more element in sbitmap.
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/loop-unroll.c
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Subject: [Bug gcov-profile/83879] __gcov_dump doesn't work with dlopen-ed libraries
Date: Wed, 07 Mar 2018 09:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83879
--- Comment #9 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Mar 7 09:48:02 2018
New Revision: 258329
URL: https://gcc.gnu.org/viewcvs?rev=258329&root=gcc&view=rev
Log:
Backport r257383
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-05 Martin Liska <mliska@suse.cz>
PR gcov-profile/83879
* doc/gcov.texi: Document necessity of --dynamic-list-data when
using dlopen functionality.
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/doc/gcov.texi
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Subject: [Bug lto/81440] -Wlto-type-mismatch warning with flexible array in struct
Date: Wed, 07 Mar 2018 09:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81440
--- Comment #11 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Mar 7 09:47:46 2018
New Revision: 258328
URL: https://gcc.gnu.org/viewcvs?rev=258328&root=gcc&view=rev
Log:
Backport r256989
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-01-23 Martin Liska <mliska@suse.cz>
PR lto/81440
* lto-symtab.c (lto_symtab_merge): Handle and do not warn about
trailing arrays at the end of a struct.
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-01-23 Martin Liska <mliska@suse.cz>
PR lto/81440
* gcc.dg/lto/pr81440.h: New test.
* gcc.dg/lto/pr81440_0.c: New test.
* gcc.dg/lto/pr81440_1.c: New test.
Added:
branches/gcc-6-branch/gcc/testsuite/gcc.dg/lto/pr81440.h
branches/gcc-6-branch/gcc/testsuite/gcc.dg/lto/pr81440_0.c
branches/gcc-6-branch/gcc/testsuite/gcc.dg/lto/pr81440_1.c
Modified:
branches/gcc-6-branch/gcc/lto/ChangeLog
branches/gcc-6-branch/gcc/lto/lto-symtab.c
branches/gcc-6-branch/gcc/testsuite/ChangeLog
>From gcc-bugs-return-596522-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 09:49:49 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug gcov-profile/84137] Typo in gcov online documentation
Date: Wed, 07 Mar 2018 09:49:00 -0000
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--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Mar 7 09:48:44 2018
New Revision: 258330
URL: https://gcc.gnu.org/viewcvs?rev=258330&root=gcc&view=rev
Log:
Backport r257384
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-05 Martin Liska <mliska@suse.cz>
PR gcov-profile/84137
* doc/gcov.texi: Fix typo in documentation.
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/doc/gcov.texi
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Subject: [Bug other/80589] Typing mistakes in two messages
Date: Wed, 07 Mar 2018 09:49:00 -0000
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--- Comment #13 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Mar 7 09:49:11 2018
New Revision: 258331
URL: https://gcc.gnu.org/viewcvs?rev=258331&root=gcc&view=rev
Log:
Backport r257803
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-19 Martin Liska <mliska@suse.cz>
PR other/80589
* doc/invoke.texi: Fix typo.
* params.def (PARAM_MAX_LOOP_HEADER_INSNS): Likewise.
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/doc/invoke.texi
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/79747] Missing documentation for -malign-{jumps,label,loops,functions}= and strange value range limitation
Date: Wed, 07 Mar 2018 09:50:00 -0000
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--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Mar 7 09:49:47 2018
New Revision: 258332
URL: https://gcc.gnu.org/viewcvs?rev=258332&root=gcc&view=rev
Log:
Backport r257842
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-20 Martin Liska <mliska@suse.cz>
PR c/84310
PR target/79747
* final.c (shorten_branches): Build align_tab array with one
more element.
* opts.c (finish_options): Add alignment option limit check.
(MAX_CODE_ALIGN): Likewise.
(MAX_CODE_ALIGN_VALUE): Likewise.
* doc/invoke.texi: Document maximum allowed option value for
all -falign-* options.
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-20 Martin Liska <mliska@suse.cz>
PR c/84310
PR target/79747
* gcc.target/i386/pr84310.c: New test.
* gcc.target/i386/pr84310-2.c: Likewise.
Added:
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/pr84310-2.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/pr84310.c
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/doc/invoke.texi
branches/gcc-6-branch/gcc/final.c
branches/gcc-6-branch/gcc/opts.c
branches/gcc-6-branch/gcc/testsuite/ChangeLog
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Subject: [Bug c/84310] -falign-{labels,loops,jumps} with value >= 32768+1 cause a segfault
Date: Wed, 07 Mar 2018 09:50:00 -0000
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--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Mar 7 09:49:47 2018
New Revision: 258332
URL: https://gcc.gnu.org/viewcvs?rev=258332&root=gcc&view=rev
Log:
Backport r257842
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-20 Martin Liska <mliska@suse.cz>
PR c/84310
PR target/79747
* final.c (shorten_branches): Build align_tab array with one
more element.
* opts.c (finish_options): Add alignment option limit check.
(MAX_CODE_ALIGN): Likewise.
(MAX_CODE_ALIGN_VALUE): Likewise.
* doc/invoke.texi: Document maximum allowed option value for
all -falign-* options.
2018-03-07 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-02-20 Martin Liska <mliska@suse.cz>
PR c/84310
PR target/79747
* gcc.target/i386/pr84310.c: New test.
* gcc.target/i386/pr84310-2.c: Likewise.
Added:
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/pr84310-2.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/pr84310.c
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/doc/invoke.texi
branches/gcc-6-branch/gcc/final.c
branches/gcc-6-branch/gcc/opts.c
branches/gcc-6-branch/gcc/testsuite/ChangeLog
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Subject: [Bug c/84310] -falign-{labels,loops,jumps} with value >= 32768+1 cause a segfault
Date: Wed, 07 Mar 2018 09:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84310
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed on all active branches.
>From gcc-bugs-return-596530-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 09:51:36 2018
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Subject: [Bug rtl-optimization/82675] ICE in duplicate_loop_to_header_edge at gcc/cfgloopmanip.c:1207
Date: Wed, 07 Mar 2018 09:51:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed on all active branches.
>From gcc-bugs-return-596531-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 09:51:46 2018
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Subject: [Bug c/84229] A valid code rejected with -flto
Date: Wed, 07 Mar 2018 09:51:00 -0000
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--- Comment #13 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed on all active branches.
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Subject: [Bug ipa/81360] [8 Regression] ice in estimate_edge_growth, at ipa-inline.h:86
Date: Wed, 07 Mar 2018 09:51:00 -0000
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--- Comment #19 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed on all active branches.
>From gcc-bugs-return-596528-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 09:51:10 2018
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Subject: [Bug gcov-profile/84137] Typo in gcov online documentation
Date: Wed, 07 Mar 2018 09:51:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed on all active branches.
>From gcc-bugs-return-596527-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 09:51:01 2018
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Subject: [Bug other/80589] Typing mistakes in two messages
Date: Wed, 07 Mar 2018 09:51:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #14 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed on all active branches.
>From gcc-bugs-return-596529-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 09:51:17 2018
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Subject: [Bug gcov-profile/83879] __gcov_dump doesn't work with dlopen-ed libraries
Date: Wed, 07 Mar 2018 09:51:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #10 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed on all active branches.
>From gcc-bugs-return-596536-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 09:52:09 2018
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Subject: [Bug c++/81716] Bogus -Wlto warning with forward-declared pointers
Date: Wed, 07 Mar 2018 09:52:00 -0000
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Bug 81716 depends on bug 83954, which changed state.
Bug 83954 Summary: [6/7 Regression] LTO: Bogus -Wlto-type-mismatch warning for array of pointer to incomplete type
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83954
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>From gcc-bugs-return-596534-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 09:52:09 2018
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Subject: [Bug lto/83954] [6/7 Regression] LTO: Bogus -Wlto-type-mismatch warning for array of pointer to incomplete type
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #18 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed on all active branches.
>From gcc-bugs-return-596537-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 09:52:53 2018
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Subject: [Bug lto/81440] -Wlto-type-mismatch warning with flexible array in struct
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81440
Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #12 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed on all active branches.
>From gcc-bugs-return-596535-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 09:52:09 2018
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Subject: [Bug lto/81440] -Wlto-type-mismatch warning with flexible array in struct
Date: Wed, 07 Mar 2018 09:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81440
Bug 81440 depends on bug 83954, which changed state.
Bug 83954 Summary: [6/7 Regression] LTO: Bogus -Wlto-type-mismatch warning for array of pointer to incomplete type
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83954
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----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug lto/81004] [7 Regression] linking failed with -flto and static libboost_program_options
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #29 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed on all active branches.
>From gcc-bugs-return-596538-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 09:53:09 2018
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Subject: [Bug target/79747] Missing documentation for -malign-{jumps,label,loops,functions}= and strange value range limitation
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed on all active branches.
>From gcc-bugs-return-596539-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 09:56:48 2018
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Subject: [Bug target/84741] [7/8 Regression] ICE in ix86_expand_prologue, at config/i386/i386.c:13893
Date: Wed, 07 Mar 2018 09:56:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org,
| |jakub at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I don't think this is a regression, the __RTL stuff has been introduced in GCC
7. And, there are infinite number of ways to get ICEs with __RTL or __GIMPLE
by just adding invalid IL, __RTL and __GIMPLE are just meant for testing the
compiler.
The reason this ICEs is that if we call run_rtl_passes we bypass the
initialization done at expand time, in particular prepare_function_start
which among other things does:
if (flag_stack_usage_info)
{
cfun->su = ggc_cleared_alloc<stack_usage> ();
cfun->su->static_stack_size = -1;
}
and so cfun->su is uninitialized.
Note, if I replace in the testcase __RTL (startwith ("vregs")) with just __RTL,
it ICEs exactly in prepare_function_start on the assertion that
gcc_assert (!get_last_insn ());
Note prepare_function_start initializes a bunch of other global vars:
cse_not_expected = ! optimize;
/* Caller save not needed yet. */
caller_save_needed = 0;
/* We haven't done register allocation yet. */
reg_renumber = 0;
/* Indicate that we have not instantiated virtual registers yet. */
virtuals_instantiated = 0;
/* Indicate that we want CONCATs now. */
generating_concat_p = 1;
/* Indicate we have no need of a frame pointer yet. */
frame_pointer_needed = 0;
If we don't start with expand pass, I guess we want !generating_concat_p, but
the others really depend on what exact pass it starts with. I'm afraid the RTL
passes has lots of other state that I don't really see how run_rtl_passes would
make it work. E.g. reload_completed, epilogue_completed, regstack_completed,
... All those start initially clear (or as set above), and at some point are
changed after some pass.
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Subject: [Bug target/84741] [7/8 Regression] ICE in ix86_expand_prologue, at config/i386/i386.c:13893
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug c++/84744] cannot use glibc 2.27 with gcc 7.3
Date: Wed, 07 Mar 2018 10:16:00 -0000
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--- Comment #7 from Peter VARGA <development@faf-ltd.com> ---
This is the original version:
#include <algorithm>
#include <atomic>
#include <chrono>
#include <cmath>
#include <condition_variable>
#include <cstdlib>
#include <forward_list>
#include <fstream>
#include <functional>
#include <iostream>
#include <map>
#include <mutex>
#include <regex>
#include <set>
#include <string>
#include <thread>
#include <vector>
#include <execinfo.h>
#include <gnu/libc-version.h>
#include <libgen.h>
#include <locale.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/poll.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/sysinfo.h>
#include <unistd.h>
#include <mysql/my_global.h>
#include <mysql/mysql.h>
Before I found now finally a solution I had to sort out the order - it was not
really that trivial and very annoying.
This is now how it works and - as it should be - the order of the include files
in the project does NOT matter anymore.
BUT, it is very important that /usr/include is last in the list, otherwise it
won't compile:
-nostdinc
-I /FaF/curl/include
-I /usr/include/mysql
-I /FaF/lib64/gcc/x86_64-suse-linux/7.3.0/include-fixed
-I /FaF/include/c++/7.3
-I /FaF/include/c++/7.3/x86_64-suse-linux/
-I /FaF/lib64/gcc/x86_64-suse-linux/7.3.0/include
-I /FaF/glibc/include/
-I /usr/include
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Subject: [Bug debug/84736] When compiling with -g -O2 internal compiler error: in force_type_die, at dwarf2out.c:25111
Date: Wed, 07 Mar 2018 10:17:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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CC| |marxin at gcc dot gnu.org
Resolution|--- |DUPLICATE
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed in gcc-7-branch@254761 thus dup.
*** This bug has been marked as a duplicate of bug 82155 ***
>From gcc-bugs-return-596543-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 10:17:45 2018
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Subject: [Bug debug/82155] [7 Regression] ICE in dwarf2out_abstract_function, at dwarf2out.c:21655
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |kuba.skowron at gmail dot com
--- Comment #10 from Martin Liška <marxin at gcc dot gnu.org> ---
*** Bug 84736 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-596544-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 10:18:56 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84746] [8 Regression] ICE on valid code at -O2 and -O3: Segmentation fault
Date: Wed, 07 Mar 2018 10:18:00 -0000
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--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
The issue is PRE inserted a PHI with a SSA name argument that is not available
there. The reason is that
constant = fully_constant_expression (expr);
...
if (constant->kind != CONSTANT)
{
...
unsigned value_id = get_expr_value_id (constant);
constant = find_leader_in_sets (value_id, set1, set2,
AVAIL_OUT (pred));
is wrong in using the ANTIC sets to find a leader. See the original fix I
pasted into PR84670. This fix regresses some testcase(s) though
(gcc.dg/tree-ssa/pr35287.c at least). Trying to recover with sth more clever
regressed sth else. As the other fix (for the assert) fixed all testcases
I had I didn't pursue this further.
Looking again.
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Subject: [Bug target/84565] [8 Regression] ICE in extract_insn, at recog.c:2304 on aarch64
Date: Wed, 07 Mar 2018 10:40:00 -0000
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Mar 7 10:39:32 2018
New Revision: 258333
URL: https://gcc.gnu.org/viewcvs?rev=258333&root=gcc&view=rev
Log:
PR fortran/84565
* config/aarch64/predicates.md (aarch64_simd_reg_or_zero): Use
aarch64_simd_or_scalar_imm_zero rather than aarch64_simd_imm_zero.
* gfortran.dg/pr84565.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/pr84565.f90
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/aarch64/predicates.md
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug middle-end/84723] [8 Regression] ICE in create_target_clone, at multiple_target.c:275
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-596546-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 10:43:48 2018
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Subject: [Bug target/84565] [8 Regression] ICE in extract_insn, at recog.c:2304 on aarch64
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-596548-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 11:01:43 2018
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Subject: [Bug driver/83206] -mfpu=auto does not work on ARM (armv7l-unknown-linux-gnueabihf)
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Tamar Christina <tnfchris at gcc dot gnu.org> changed:
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--- Comment #21 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Since the bug seems to be fixed, anything keeping this ticket open?
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Subject: [Bug tree-optimization/84740] [8 Regression] ICE in build_constructors, at tree-switch-conversion.c:965
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
Assignee|marxin at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Untested fix:
--- gcc/tree-switch-conversion.c.jj 2018-01-09 08:58:15.000000000 +0100
+++ gcc/tree-switch-conversion.c 2018-03-07 12:03:42.228246408 +0100
@@ -1563,7 +1563,8 @@ process_switch (gswitch *swtch)
gather_default_values (info.default_case_nonstandard
? gimple_switch_label (swtch, 1)
: gimple_switch_default_label (swtch), &info);
- build_constructors (swtch, &info);
+ if (info.phi_count)
+ build_constructors (swtch, &info);
build_arrays (swtch, &info); /* Build the static arrays and assignments.
*/
gen_inbound_check (swtch, &info); /* Build the bounds check. */
I think it is better to do this rather than if (info.phi_count) return "no
non-virtual phis"; before create_temp_arrays, because this way we optimize the
switch into if, while otherwise we don't. Most of the functions will not
really do much, e.g. allocate 0 elts arrays, etc., but only build_constructors
relies on info->phi_count > 0.
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Subject: [Bug tree-optimization/84740] [8 Regression] ICE in build_constructors, at tree-switch-conversion.c:965
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43583
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43583&action=edit
gcc8-pr84740.patch
Full untested patch.
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Subject: [Bug c/84747] New: alias analysis reports may-conflict for references to disjoint address spaces
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Bug ID: 84747
Summary: alias analysis reports may-conflict for references to
disjoint address spaces
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: stefan at reservoir dot com
Target Milestone: ---
Created attachment 43584
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43584&action=edit
patch to improve alias analysis for disjoint address spaces
For an out-of-tree target that supports address spaces the aliaser does not
report that references to distinct non-overlapping address spaces don’t
conflict. The following program shows this failure when compiled with gcc 7.3
and ‘–O’:
typedef int v4si __attribute__((__vector_size__(16)));
v4si
foo (__seg_gs v4si* ap, v4si* gp)
{
*gp += (v4si){1,1,1,1};
*ap = (v4si){1,2,3,4};
return *gp;
}
To wit, the store ‘*ap =’ should not kill the available value of ‘*gp +=’ of
the preceding line, hence no reload of ‘*gp’ should be needed for the return.
The attached patch eliminates the load for the return, both in tree-ssa-alias.c
(ME) and alias.c (BE). The latter is included for completeness.
This target also supports some references to a special address space with some
side effects that cannot be described by the IR. We use intrinsics to perform
these operations. These intrinsics should not kill references to the generic
address space. To accomplish this, the attached patch also provides target
hooks to leave it to the target specific code to decide whether these
intrinsics conflict with other references. These hooks are not yet documented
since I wasn’t sure in which section they should be documented.
Finally, the patch includes a warning for conversions between pointers to
non-overlapping address spaces that are not known to be null pointers, as such
conversions are ill defined.
>From gcc-bugs-return-596552-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 11:28:03 2018
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Subject: [Bug tree-optimization/84746] [8 Regression] ICE on valid code at -O2 and -O3: Segmentation fault
Date: Wed, 07 Mar 2018 11:28:00 -0000
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--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
This is also latent on the GCC 7 branch.
>From gcc-bugs-return-596553-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 12:04:57 2018
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Subject: [Bug middle-end/84747] alias analysis reports may-conflict for references to disjoint address spaces
Date: Wed, 07 Mar 2018 12:04:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |alias, missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-07
Component|c |middle-end
Ever confirmed|0 |1
Severity|normal |enhancement
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note that patches to gcc should be posted to gcc-patches@gcc.gnu.org
Note that to contribute patches you (and/or your empolyer) need to assign
copyright to the FSF, see https://gcc.gnu.org/contribute.html
Confirmed, GCC doesn't use address-space info for disambiguation.
>From gcc-bugs-return-596554-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 12:11:40 2018
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Subject: [Bug c++/59798] [C++11] ICE befriending an inheriting constructor template specialization
Date: Wed, 07 Mar 2018 12:11:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mpolacek at gcc dot gnu.org
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
The ICE is now:
59798.C:4:8: internal compiler error: in deduce_inheriting_ctor, at
cp/method.c:1909
B b(0);
^
0x97582e deduce_inheriting_ctor(tree_node*)
/home/marek/src/gcc/gcc/cp/method.c:1909
0x81692e build_over_call
/home/marek/src/gcc/gcc/cp/call.c:7678
0x81f04a build_new_method_call_1
/home/marek/src/gcc/gcc/cp/call.c:9289
0x81f62e build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, tree_node*, int, tree_node**, int)
/home/marek/src/gcc/gcc/cp/call.c:9364
0x81c95c build_special_member_call(tree_node*, tree_node*, vec<tree_node*,
va_gc, vl_embed>**, tree_node*, int, int)
/home/marek/src/gcc/gcc/cp/call.c:8892
0x93573d expand_default_init
/home/marek/src/gcc/gcc/cp/init.c:1892
0x935d60 expand_aggr_init_1
/home/marek/src/gcc/gcc/cp/init.c:2007
0x934a6a build_aggr_init(tree_node*, tree_node*, int, int)
/home/marek/src/gcc/gcc/cp/init.c:1747
0x8c942b build_aggr_init_full_exprs
/home/marek/src/gcc/gcc/cp/decl.c:6228
0x8ca267 check_initializer
/home/marek/src/gcc/gcc/cp/decl.c:6377
0x8cdaaa cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
/home/marek/src/gcc/gcc/cp/decl.c:7078
0x9c0f77 cp_parser_init_declarator
/home/marek/src/gcc/gcc/cp/parser.c:19723
0x9b4527 cp_parser_simple_declaration
/home/marek/src/gcc/gcc/cp/parser.c:13057
0x9b4090 cp_parser_block_declaration
/home/marek/src/gcc/gcc/cp/parser.c:12882
0x9b3e12 cp_parser_declaration
/home/marek/src/gcc/gcc/cp/parser.c:12780
0x9b396b cp_parser_declaration_seq_opt
/home/marek/src/gcc/gcc/cp/parser.c:12656
0x9a21cf cp_parser_translation_unit
/home/marek/src/gcc/gcc/cp/parser.c:4561
0x9f43d7 c_parse_file()
/home/marek/src/gcc/gcc/cp/parser.c:38995
0xb81b40 c_common_parse_file()
/home/marek/src/gcc/gcc/c-family/c-opts.c:1132
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
>From gcc-bugs-return-596555-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 12:12:57 2018
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Subject: [Bug fortran/84734] [8 Regression] Compiling gfortran.dg/size_kind_(2|3).f90 with -fdefault-integer-8 gives an ICE
Date: Wed, 07 Mar 2018 12:12:00 -0000
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--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The following code
integer :: B(huge(1_8)+3_8,2_8)
integer(8) :: var1(2), var2, var3
var1 = shape(B,kind=8)
var2 = size(B,kind=8)
var3 = size(B,dim=1,kind=8)
end
gives the same ICE without -fdefault-integer-8.
New range between revisions r257969 (2018-02-25, OK) and r258030 (2018-02-27,
ICE).
>From gcc-bugs-return-596556-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 12:32:51 2018
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Subject: [Bug rtl-optimization/84748] New: [8 Regression] wrong code with u128 at aarch64 at -O and and above
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Bug ID: 84748
Summary: [8 Regression] wrong code with u128 at aarch64 at -O
and and above
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
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Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: aarch64-unknown-linux-gnu
Created attachment 43585
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43585&action=edit
reduced testcase
Output:
$ aarch64-unknown-linux-gnu-gcc -O testcase.c -static
$ ./a.out
qemu: uncaught target signal 6 (Aborted) - core dumped
Aborted
$ aarch64-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-aarch64/bin/aarch64-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-258314-checking-yes-rtl-df-extra-aarch64/bin/../libexec/gcc/aarch64-unknown-linux-gnu/8.0.1/lto-wrapper
Target: aarch64-unknown-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--with-cloog --with-ppl --with-isl
--with-sysroot=/usr/aarch64-unknown-linux-gnu --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=aarch64-unknown-linux-gnu
--with-ld=/usr/bin/aarch64-unknown-linux-gnu-ld
--with-as=/usr/bin/aarch64-unknown-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-258314-checking-yes-rtl-df-extra-aarch64
Thread model: posix
gcc version 8.0.1 20180307 (experimental) (GCC)
This patch:
+++ testcase.s 2018-03-07 13:30:25.248052580 +0100
@@ -27,6 +27,7 @@
ldr x2, [x19, #:lo12:b]
ldr x1, [x20, 8]
adds x0, x0, x2
+ adc x1, x4, x1
adrp x2, d
ldr w2, [x2, #:lo12:d]
sub w2, w2, #81920
@@ -36,7 +37,6 @@
str w2, [x3, #:lo12:c]
and x2, x2, 1
mov x3, 0
- adc x1, x4, x1
bl __udivti3
str x0, [x19, #:lo12:b]
str x1, [x20, 8]
fixes the -O1 assembly; the "adc" is probably scheduled later by some pass,
even though it crosses modification of the carry flag.
>From gcc-bugs-return-596557-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 12:43:43 2018
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Subject: [Bug c++/84699] discarded value expression of volatile class type shall materialize a temporary
Date: Wed, 07 Mar 2018 12:43:00 -0000
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--- Comment #1 from Olivier Kannengieser <okannen at gmail dot com> ---
A link to an answer to a question on stack overflow that details what should
happen:
https://stackoverflow.com/a/29873914/5632316
>From gcc-bugs-return-596558-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 12:50:06 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/84744] cannot use glibc 2.27 with gcc 7.3
Date: Wed, 07 Mar 2018 12:50:00 -0000
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--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
You need to recompile gcc telling it to use the new glibc.
When GCC is built it creates fixed dependencies on the C library. You can't
just point it to a new libc and expect it to work. A new C library needs a new
compiler as well.
So build GCC (see https://gcc.gnu.org/wiki/InstallingGCC for a starting point)
and add --with-native-system-header-dir=/FaF/glibc/include/ to the configure
options.
>From gcc-bugs-return-596559-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 13:01:20 2018
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Subject: [Bug rtl-optimization/84748] [8 Regression] wrong code with u128 at aarch64 at -O and and above
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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>From gcc-bugs-return-596560-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 13:12:48 2018
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Subject: [Bug sanitizer/84732] false-positive -Wstringop-truncation warning with -fsanitize-coverage=trace-pc
Date: Wed, 07 Mar 2018 13:12:00 -0000
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--- Comment #5 from Arnd Bergmann <arnd at linaro dot org> ---
Created attachment 43586
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43586&action=edit
drivers/gpu/drm/drm_property.c, preprocessed
I found another case that appears to be related but not the same, attaching
another (non-reduced) file for reference. The code that triggered a warning
this time is:
strncpy(property->name, name, DRM_PROP_NAME_LEN);
property->name[DRM_PROP_NAME_LEN-1] = '\0';
but unlike the first one, this only happens with -fsanitize=kernel-address but
not with -fsanitize-coverage=trace-pc:
$ x86_64-linux-gcc-8.0.1 -fno-strict-aliasing -O2 -Wall -S drm_property.i
-fsanitize=kernel-address
/git/arm-soc/drivers/gpu/drm/drm_property.c: In function 'drm_property_create':
/git/arm-soc/include/linux/string.h:254:9: warning: '__builtin_strncpy'
specified bound 32 equals destination size [-Wstringop-truncation]
return __builtin_strncpy(p, q, size);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/git/arm-soc/drivers/gpu/drm/drm_property.c: In function
'drm_property_add_enum':
/git/arm-soc/include/linux/string.h:254:9: warning: '__builtin_strncpy'
specified bound 32 equals destination size [-Wstringop-truncation]
return __builtin_strncpy(p, q, size);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/git/arm-soc/include/linux/string.h:254:9: warning: '__builtin_strncpy'
specified bound 32 equals destination size [-Wstringop-truncation]
return __builtin_strncpy(p, q, size);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>From gcc-bugs-return-596561-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 13:22:43 2018
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Subject: [Bug lto/84592] [openacc,openmp] lto1: ICE in input_varpool_node, at lto-cgraph.c:1424: for CSWTCH symbol
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Tom de Vries <vries at gcc dot gnu.org> changed:
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--- Comment #10 from Tom de Vries <vries at gcc dot gnu.org> ---
https://gcc.gnu.org/ml/gcc-patches/2018-03/msg00320.html
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Subject: [Bug debug/63572] [6/7/8 Regression] ICF breaks user debugging experience
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Target Milestone|6.5 |---
>From gcc-bugs-return-596563-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 13:37:20 2018
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Subject: [Bug driver/84749] New: -w does not work with option property Warn
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Bug ID: 84749
Summary: -w does not work with option property Warn
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As example,
echo|i386-linux-gcc -mintel-syntax -w -xc -S -
prints
i386-linux-gcc: warning: '-mintel-syntax' and '-mno-intel-syntax' are
deprecated; use '-masm=intel' and '-masm=att' instead
while -w should shut up all warnings (there is no other way to turn off
messages
by Warn option properties either).
>From gcc-bugs-return-596564-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 13:41:50 2018
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Subject: [Bug sanitizer/84732] false-positive -Wstringop-truncation warning with -fsanitize-coverage=trace-pc
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Short testcase for the latter, -O2 -Wall vs. -O2 -Wall -fsanitize=address:
struct S { char p[32]; };
struct S *
foo (char *q)
{
struct S *p = __builtin_malloc (sizeof (struct S));
__builtin_strncpy (p->p, q, 32);
p->p[31] = '\0';
return p;
}
With -fsanitize={,kernel-}address there is:
__builtin_strncpy (_1, q_5(D), 32);
_8 = &p_4->p[31];
ASAN_CHECK (7, _8, 1, 1);
p_4->p[31] = 0;
So, the -Wstringop-truncation would need to do the suggested alias search for
the store rather than next statement it does now, and in addition to that would
need to ignore ASAN_CHECK, because those are guaranteed not to actually read
the passed memory, just to check corresponding shadow memory.
>From gcc-bugs-return-596565-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:01:01 2018
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Subject: [Bug libstdc++/84738] stack-overflow in regex_match
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-07
CC| |marxin at gcc dot gnu.org
Ever confirmed|0 |1
Known to fail| |6.4.0, 7.3.0, 8.0
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, I see it for GCC 6,7,8. But maybe older versions are also affected.
>From gcc-bugs-return-596566-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:03:33 2018
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Subject: [Bug driver/83206] -mfpu=auto does not work on ARM (armv7l-unknown-linux-gnueabihf)
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--- Comment #22 from Andrew Roberts <andrewm.roberts at sky dot com> ---
The RPI Zero bug was fixed, I'm retesting with the latest snapshot (8.0.1
20180304) just to be sure it is ok. There are still a number of inconsistencies
and things which could be improved.
On Odroid-Xu4 (Cortex A15/A7 Big/little, Aarch32)
-------------------------------------------------
/usr/local/gcc/bin/gcc -mfpu=auto -O3 -o matrix matrix.c
cc1: error: -mfloat-abi=hard: selected processor lacks an FPU
It would be better if this error could let the user know they need to select a
CPU manually, rather than incorrectly state it lacks an FPU. This is going to
be confusing to people.
/usr/local/gcc/bin/gcc -mcpu=native -mfpu=auto -O3 -o matrix matrix.c
Is fine.
/usr/local/gcc/bin/gcc -march=native -Q --help=target | grep
"mcpu\|mfpu\|march"
-march= armv7ve+vfpv3-d16
-mcpu=
-mfpu= vfpv3-d16
/usr/local/gcc/bin/gcc -march=native -mcpu=native -Q --help=target | grep
"mcpu\|mfpu\|march"
-march= armv7ve+vfpv3-d16
-mcpu= cortex-a7
-mfpu= vfpv3-d16
This is still not detecting BIG/little CPU combinations (I had a separate PR
about this [83207]).
On ODROID-C2 (Cortex A53,AARCH64)
----------------------
/usr/local/gcc/bin/gcc -march=native -mcpu=native -Q --help=target | grep
"mcpu\|mfpu\|march"
-march=ARCH armv8-a+crc
-mcpu=CPU cortex-a53
The output is inconsistent with aarch32 output (=ARCH, =CPU), I had also raised
a PR about this [83193].
On RPI 3 (Cortex A53,AArch32)
-----------------------------
No issues here that I can see.
I'll update again tomorrow when the RPI Zero build has completed
>From gcc-bugs-return-596567-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:07:13 2018
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Subject: [Bug tree-optimization/84737] [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888
Date: Wed, 07 Mar 2018 14:07:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-03-07
Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Isn't that dup of 84149? Can you please tweak --param ipa-cp-eval-threshold to
value to 200, 300, 400? Can you please attach -fdump-ipa-cp-details file?
>From gcc-bugs-return-596568-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:07:38 2018
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Subject: [Bug c++/58908] ICE in process_init_constructor_array for std::vector
Date: Wed, 07 Mar 2018 14:07:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed by r257720.
>From gcc-bugs-return-596569-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:12:21 2018
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Subject: [Bug c++/64035] [C++11] ICE in reshape_init_r when using initializer list aggregate initialization for default function parameters
Date: Wed, 07 Mar 2018 14:12:00 -0000
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--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Still ICEs:
$ ./cc1plus -quiet test1.cpp
test1.cpp: In function ‘int main()’:
test1.cpp:18:7: internal compiler error: in reshape_init_r, at cp/decl.c:6097
func();
^
0x8c8d7e reshape_init_r
/home/marek/src/gcc/gcc/cp/decl.c:6097
0x8c810a reshape_init_class
/home/marek/src/gcc/gcc/cp/decl.c:5879
0x8c8e2b reshape_init_r
/home/marek/src/gcc/gcc/cp/decl.c:6110
0x8c90b3 reshape_init(tree_node*, tree_node*, int)
/home/marek/src/gcc/gcc/cp/decl.c:6170
0x7ff6da implicit_conversion
/home/marek/src/gcc/gcc/cp/call.c:1831
0x824b2f perform_implicit_conversion_flags(tree_node*, tree_node*, int, int)
/home/marek/src/gcc/gcc/cp/call.c:10563
0xb077ad convert_for_initialization(tree_node*, tree_node*, tree_node*, int,
impl_conv_rhs, tree_node*, int, int)
/home/marek/src/gcc/gcc/cp/typeck.c:8980
0x81559e convert_default_arg(tree_node*, tree_node*, tree_node*, int, int)
/home/marek/src/gcc/gcc/cp/call.c:7355
0x81820e build_over_call
/home/marek/src/gcc/gcc/cp/call.c:7960
0x808f59 build_new_function_call(tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
/home/marek/src/gcc/gcc/cp/call.c:4317
0xa9b767 finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool,
bool, int)
/home/marek/src/gcc/gcc/cp/semantics.c:2500
0x9a80e8 cp_parser_postfix_expression
/home/marek/src/gcc/gcc/cp/parser.c:7243
0x9aa988 cp_parser_unary_expression
/home/marek/src/gcc/gcc/cp/parser.c:8322
0x9abaa4 cp_parser_cast_expression
/home/marek/src/gcc/gcc/cp/parser.c:9090
0x9abba1 cp_parser_binary_expression
/home/marek/src/gcc/gcc/cp/parser.c:9191
0x9ac97e cp_parser_assignment_expression
/home/marek/src/gcc/gcc/cp/parser.c:9486
0x9acd1b cp_parser_expression
/home/marek/src/gcc/gcc/cp/parser.c:9655
0x9aff06 cp_parser_expression_statement
/home/marek/src/gcc/gcc/cp/parser.c:11131
0x9af813 cp_parser_statement
/home/marek/src/gcc/gcc/cp/parser.c:10935
0x9b0565 cp_parser_statement_seq_opt
/home/marek/src/gcc/gcc/cp/parser.c:11274
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
>From gcc-bugs-return-596570-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:17:26 2018
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Subject: [Bug driver/84750] New: Both the driver and cc1 warn for Target Warn option properties
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Try rs6000 with -mstring for example:
$ powerpc-linux-gcc -Wall -W -O2 -S 0.c -mstring
powerpc-linux-gcc: warning: '-mstring' is deprecated
cc1: warning: '-mstring' is deprecated
Or on another target:
$ arc-elf-gcc -Wall -W -O2 -S 0.c -mcrc
arc-elf-gcc: warning: '-mcrc' is deprecated
cc1: warning: '-mcrc' is deprecated
>From gcc-bugs-return-596571-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:20:06 2018
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Subject: [Bug c++/61228] noexcept(expression) causes internal compiler error
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed by r254022.
>From gcc-bugs-return-596572-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:32:37 2018
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Subject: [Bug c++/64751] internal compiler error: in gen_type_die_with_usage, at dwarf2out.c:19486
Date: Wed, 07 Mar 2018 14:32:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
All active branches seem to reject this and don't ICE.
>From gcc-bugs-return-596573-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:37:02 2018
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Subject: [Bug c++/67724] internal compiler error in stl_vector.h
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
The testcase contains binary data. GCC 4.9 is no longer supported. I'll close
this, please reopen if you still see the bug.
>From gcc-bugs-return-596574-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:41:50 2018
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Subject: [Bug c++/68180] [ICE] at cp/constexpr.c:2768 in initializing __vector in a loop
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----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |mpolacek at gcc dot gnu.org
Resolution|--- |FIXED
--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Testcase is now rejected with
error: modification of ‘(float [4])v’ is not a constant-expression
constexpr float32x4_t v = fill(1.f);
since r236630. ICE is gone. Closing.
>From gcc-bugs-return-596576-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:43:41 2018
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Subject: [Bug c++/70938] [5 only] internal compiler error: in tsubst_copy, at cp/pt.c:13008
Date: Wed, 07 Mar 2018 14:43:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
GCC 5 is not supported anymore, closing.
>From gcc-bugs-return-596575-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:43:07 2018
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Subject: [Bug c++/68451] internal compiler error: Segmentation fault when using decltype with friend inside a class template
Date: Wed, 07 Mar 2018 14:43:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Still ICEs:
$ ./cc1plus -quiet 68451.C
68451.C: In instantiation of ‘struct C<int>’:
68451.C:21:12: required from here
68451.C:12:7: internal compiler error: Segmentation fault
A a;
^
0x1230d5b crash_signal
/home/marek/src/gcc/gcc/toplev.c:325
0xa2c870 instantiate_class_template_1
/home/marek/src/gcc/gcc/cp/pt.c:10926
0xa2cd6b instantiate_class_template(tree_node*)
/home/marek/src/gcc/gcc/cp/pt.c:11055
0xae51f4 complete_type(tree_node*)
/home/marek/src/gcc/gcc/cp/typeck.c:136
0x8c5cf7 start_decl_1(tree_node*, bool)
/home/marek/src/gcc/gcc/cp/decl.c:5241
0x8c5af9 start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
/home/marek/src/gcc/gcc/cp/decl.c:5204
0x9c0aa6 cp_parser_init_declarator
/home/marek/src/gcc/gcc/cp/parser.c:19598
0x9b4527 cp_parser_simple_declaration
/home/marek/src/gcc/gcc/cp/parser.c:13057
0x9b4090 cp_parser_block_declaration
/home/marek/src/gcc/gcc/cp/parser.c:12882
0x9b3480 cp_parser_declaration_statement
/home/marek/src/gcc/gcc/cp/parser.c:12476
0x9af7d6 cp_parser_statement
/home/marek/src/gcc/gcc/cp/parser.c:10925
0x9b0565 cp_parser_statement_seq_opt
/home/marek/src/gcc/gcc/cp/parser.c:11274
0x9b045b cp_parser_compound_statement
/home/marek/src/gcc/gcc/cp/parser.c:11228
0x9c4e18 cp_parser_function_body
/home/marek/src/gcc/gcc/cp/parser.c:21776
0x9c50db cp_parser_ctor_initializer_opt_and_function_body
/home/marek/src/gcc/gcc/cp/parser.c:21813
0x9ced83 cp_parser_function_definition_after_declarator
/home/marek/src/gcc/gcc/cp/parser.c:26818
0x9ceba9 cp_parser_function_definition_from_specifiers_and_declarator
/home/marek/src/gcc/gcc/cp/parser.c:26734
0x9c07c8 cp_parser_init_declarator
/home/marek/src/gcc/gcc/cp/parser.c:19502
0x9b4527 cp_parser_simple_declaration
/home/marek/src/gcc/gcc/cp/parser.c:13057
0x9b4090 cp_parser_block_declaration
/home/marek/src/gcc/gcc/cp/parser.c:12882
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
>From gcc-bugs-return-596577-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:45:52 2018
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Subject: [Bug c++/80452] [DR 1579] incorrect value category deduced for return value
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
As the code snippet is also rejected in GCC 7, do you plan to backport that?
>From gcc-bugs-return-596578-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:48:45 2018
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Subject: [Bug c++/77869] ICE on a code piece
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed by r255780.
>From gcc-bugs-return-596579-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:49:28 2018
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Subject: [Bug rtl-optimization/84748] [8 Regression] wrong code with u128 at aarch64 at -O and and above
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ktkachov at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
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Known to work| |7.2.1
Ever confirmed|0 |1
Known to fail| |8.0
--- Comment #1 from ktkachov at gcc dot gnu.org ---
Confirmed.
>From gcc-bugs-return-596580-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:51:54 2018
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Subject: [Bug c++/79271] Internal compiler error (ICE) in 'tsubst_copy' when combining constexpr array and higher order functions
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed by r251433. Not backportable.
>From gcc-bugs-return-596581-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:53:24 2018
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Subject: [Bug c++/84699] discarded value expression of volatile class type shall materialize a temporary
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Jens Maurer <jens.maurer at gmx dot net> changed:
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--- Comment #2 from Jens Maurer <jens.maurer at gmx dot net> ---
This is core issue 1054.
>From gcc-bugs-return-596582-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 14:59:20 2018
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Subject: [Bug rtl-optimization/84748] [8 Regression] wrong code with u128 at aarch64 at -O and and above
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ktkachov at gcc dot gnu.org changed:
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--- Comment #2 from ktkachov at gcc dot gnu.org ---
I see the problem. Testing a patch.
Combine ends up moving the CC-using instruction over a
*compare_cstore<mode>_insn pattern because *compare_cstore<mode>_insn is not
marked as clobbering the CC reg, though it does so during post-reload
splitting.
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Subject: [Bug libstdc++/78420] [6/7/8 Regression] std::less<T*> is not a total order with -O2 enabled
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From: "acsawdey at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/84743] default widths for parallel reassociation now hurt rather than help
Date: Wed, 07 Mar 2018 15:22:00 -0000
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--- Comment #3 from acsawdey at gcc dot gnu.org ---
Yes I'm digging into this now and omnetpp is at the top of the list. I can see
if there is a difference between cpu2006 and 2017 as well. For gcc7 I used 2006
to determine the widths.
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Subject: [Bug fortran/59093] Segfault in gfc_trans_pointer_assignment
Date: Wed, 07 Mar 2018 15:23:00 -0000
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--- Comment #14 from Matt Thompson <matthew.thompson at nasa dot gov> ---
Query: What version of GCC will fix this? It was reported fixed last year, but
GCC 7.3.0 still ICEs out.
>From gcc-bugs-return-596586-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 15:26:45 2018
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Subject: [Bug fortran/77296] [F03] Compiler Error with allocatable string and associate
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--- Comment #6 from Matt Thompson <matthew.thompson at nasa dot gov> ---
(In reply to Thomas Koenig from comment #5)
> This has been fixed by Paul's patch, closing.
>
> Thanks for the bug report!
Will this patch appear in GCC 8? 7.4? I only ask because I had another bug (bug
59093) which was marked FIXED in 2017 but still isn't fixed in 7.3.
Is there a way to query which version bugs are fixed in?
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Subject: [Bug target/84277] [8 Regression] A lot of new acats testsuite failures
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--- Comment #13 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Author: ebotcazou
Date: Wed Mar 7 15:54:59 2018
New Revision: 258338
URL: https://gcc.gnu.org/viewcvs?rev=258338&root=gcc&view=rev
Log:
PR target/84277
* except.h (output_function_exception_table): Adjust prototype.
* except.c (output_function_exception_table): Remove FNNAME parameter
and add SECTION parameter. Ouput one part of the table at a time.
* final.c (final_scan_insn_1) <NOTE_INSN_SWITCH_TEXT_SECTIONS>: Output
the first part of the exception table and emit unwind directives.
* config/i386/i386-protos.h (i386_pe_end_cold_function): Declare.
(i386_pe_seh_cold_init): Likewise.
* config/i386/cygming.h (ASM_DECLARE_COLD_FUNCTION_NAME): New macro.
(ASM_DECLARE_COLD_FUNCTION_SIZE): Likewise.
* config/i386/i386.c (x86_expand_epilogue): Fix wording in comment.
(ix86_output_call_insn): Emit a nop in one more case for SEH.
* config/i386/winnt.c: Include except.h.
(struct seh_frame_state): Add reg_offset, after_prologue and
in_cold_section fields.
(i386_pe_seh_end_prologue): Set seh->after_prologue.
(i386_pe_seh_cold_init): New function.
(i386_pe_seh_fini): Add COLD parameter and bail out if it is not equal
to seh->in_cold_section.
(seh_emit_push): Record the offset of the push.
(seh_emit_save): Record the offet of the save.
(i386_pe_seh_unwind_emit): Deal with NOTE_INSN_SWITCH_TEXT_SECTIONS.
Test seh->after_prologue to disregard the epilogue.
(i386_pe_end_function): Pass FALSE to i386_pe_seh_fini.
(i386_pe_end_cold_function): New function.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/cygming.h
trunk/gcc/config/i386/i386-protos.h
trunk/gcc/config/i386/i386.c
trunk/gcc/config/i386/winnt.c
trunk/gcc/except.c
trunk/gcc/except.h
trunk/gcc/final.c
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Subject: [Bug target/84277] [8 Regression] A lot of new acats testsuite failures
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
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Resolution|--- |FIXED
--- Comment #14 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Results for 8.x should be on par with those for 7.3.x now.
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Subject: [Bug c++/80452] [DR 1579] incorrect value category deduced for return value
Date: Wed, 07 Mar 2018 17:07:00 -0000
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--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #4)
> As the code snippet is also rejected in GCC 7, do you plan to backport that?
I wasn't planning to, since it isn't a regression, but I could be convinced.
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/80598] [7/8 regression] -Wunused triggers for functions used in uninstantiated templates
Date: Wed, 07 Mar 2018 17:36:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |jason at gcc dot gnu.org
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r245643.
I wonder if we couldn't do something like following, still set TREE_USED on
where we've previously called mark_used but not really do the rest.
--- gcc/cp/semantics.c.jj 2018-03-06 21:40:35.717360176 +0100
+++ gcc/cp/semantics.c 2018-03-07 18:31:35.782132830 +0100
@@ -3740,10 +3740,15 @@ finish_id_expression (tree id_expression
But only mark it if it's a complete postfix-expression; in a call,
ADL might select a different function, and we'll call mark_used in
build_over_call. */
- if (done
- && !really_overloaded_fn (decl)
- && !mark_used (first_fn))
- return error_mark_node;
+ if (!really_overloaded_fn (decl))
+ {
+ if (done && !mark_used (first_fn))
+ return error_mark_node;
+ /* Otherwise in templates mark first_fn as potentially used
+ for the benefit of -Wunused, see PR80598. */
+ else if (!done && processing_template_decl)
+ TREE_USED (first_fn) = 1;
+ }
if (!template_arg_p
&& TREE_CODE (first_fn) == FUNCTION_DECL
--- gcc/testsuite/g++.dg/warn/Wunused-function4.C.jj 2018-03-07
18:34:30.463176743 +0100
+++ gcc/testsuite/g++.dg/warn/Wunused-function4.C 2018-03-07
18:33:20.484159148 +0100
@@ -0,0 +1,21 @@
+// PR c++/80598
+// { dg-do compile }
+// { dg-options "-Wunused-function" }
+
+static void
+foo () // { dg-bogus "defined but not used" }
+{
+}
+
+static void
+bar () // { dg-warning "defined but not used" }
+{
+}
+
+template <class T>
+int
+baz (T x)
+{
+ foo ();
+ return 0;
+}
>From gcc-bugs-return-596591-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 17:39:48 2018
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From: "willschm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84751] New: ICE with debug build of gcc GIMPLE pass: store-merging or IPA pass: cp
Date: Wed, 07 Mar 2018 17:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84751
Bug ID: 84751
Summary: ICE with debug build of gcc GIMPLE pass:
store-merging or IPA pass: cp
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: willschm at gcc dot gnu.org
Target Milestone: ---
Created attachment 43587
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43587&action=edit
testcase
This was noticed during investigation into pr82982 on powerpc64-*-linux-gnu* ,
but believed to be a separate issue.
With a 'debug' build of gcc, where $CPU_COUNT is any value, and the assorted
CFLAGS values are set like in the following.
make -j $CPU_COUNT CFLAGS="-O0 -g3 -fno-inline" CXXFLAGS="-O0 -g3 -fno-inline"
CFLAGS_FOR_BUILD="-O0 -g3 -fno-inline" CFLAGS_FOR_TARGET="-O0 -g3 -fno-inline"
CXXFLAGS_FOR_BUILD="-O0 -g3 -fno-inline" CXXFLAGS_FOR_TARGET="-O0 -g3
-fno-inline"
the resulting gcc will ICE when building the testcase with -O2 or higher.
# driver with -O2
~/gcc/generic.noprereqs.noconfig.debug> ./gcc/cc1 ../pr82982.c -O2
km
Analyzing compilation unit
Performing interprocedural optimizations
<*free_lang_data> <visibility> <build_ssa_passes> <opt_local_passes>
<targetclone> <free-fnsummary> <whole-program> <profile_estimate> <icf>
<devirt> <cp> <fnsummary> <inline> <pure-const> <free-fnsummary> <static-var>
<single-use> <comdats>Assembling functions:
<materialize-all-clones> kmduring GIMPLE pass: store-merging
../pr82982.c: In function ‘km’:
../pr82982.c:4:1: internal compiler error: Segmentation fault
km (void)
^~
0x10f2da87 crash_signal
/home/willschm/gcc/trunk.svn/gcc/toplev.c:325
0x11f76638 trim_filename(char const*)
/home/willschm/gcc/trunk.svn/gcc/diagnostic.c:1023
0x11f78517 fancy_abort(char const*, int, char const*)
/home/willschm/gcc/trunk.svn/gcc/diagnostic.c:1509
0x114b56df inchash::add_expr(tree_node const*, inchash::hash&, unsigned int)
/home/willschm/gcc/trunk.svn/gcc/tree.c:7425
0x10f82493 iterative_hash_expr
/home/willschm/gcc/trunk.svn/gcc/tree.h:4934
0x10f89467 tree_operand_hash::hash(tree_node* const&)
/home/willschm/gcc/trunk.svn/gcc/tree-hash-traits.h:34
0x11d73dbb hash
/home/willschm/gcc/trunk.svn/gcc/hash-map-traits.h:49
0x11d7497b get
/home/willschm/gcc/trunk.svn/gcc/hash-map.h:161
0x11d84fab process_store
/home/willschm/gcc/trunk.svn/gcc/gimple-ssa-store-merging.c:4171
0x11d85697 execute
/home/willschm/gcc/trunk.svn/gcc/gimple-ssa-store-merging.c:4279
Please submit a full bug report,
with preprocessed source if appropriate.
# gcc with -O2
/home/willschm/gcc/install/gcc-mainline-pr82982/bin/gcc ~/gcc/pr82982.c -c -O2
during GIMPLE pass: store-merging
/home/willschm/gcc/pr82982.c: In function ‘km’:
/home/willschm/gcc/pr82982.c:4:1: internal compiler error: Segmentation fault
km (void)
^~
0x10f76343 crash_signal
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/toplev.c:325
0x11fd5d98 internal_error(char const*, ...)
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/diagnostic.c:1433
0x11fd5e3f fancy_abort(char const*, int, char const*)
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/diagnostic.c:1500
0x114fd4cb inchash::add_expr(tree_node const*, inchash::hash&, unsigned int)
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/tree.c:7425
0x10fcad2f iterative_hash_expr
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/tree.h:4934
0x10fd1d03 tree_operand_hash::hash(tree_node* const&)
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/tree-hash-traits.h:34
0x11da7caf hash
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/hash-map-traits.h:49
0x11da886f get
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/hash-map.h:161
0x11db8e9f process_store
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/gimple-ssa-store-merging.c:4171
0x11db958b execute
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/gimple-ssa-store-merging.c:4279
Please submit a full bug report,
# gcc with -O3
# looks like the failure shows up during IPA pass: cp with -O3.
/home/willschm/gcc/install/gcc-mainline-pr82982/bin/gcc ~/gcc/pr82982.c -c -O3
during IPA pass: cp
/home/willschm/gcc/pr82982.c:31:1: internal compiler error: Segmentation fault
}
^
0x10f76343 crash_signal
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/toplev.c:325
0x103de144 tree_check(tree_node*, char const*, int, char const*, tree_code)
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/tree.h:3131
0x10daaa6f opts_for_fn
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/tree.h:5319
0x10dbec43 cgraph_node::optimize_for_size_p()
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/cgraph.h:3152
0x11e526bf ipcp_cloning_candidate_p
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/ipa-cp.c:727
0x11e52ab7 initialize_node_lattices
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/ipa-cp.c:1195
0x11e5fd3f ipcp_propagate_stage
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/ipa-cp.c:3302
0x11e600db ipcp_driver
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/ipa-cp.c:5044
0x11e601c3 execute
/home/willschm/gcc/gcc-mainline-pr82982/gcc.git/gcc/ipa-cp.c:5138
Please submit a full bug report,
>From gcc-bugs-return-596592-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 17:48:56 2018
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Subject: [Bug middle-end/84747] alias analysis reports may-conflict for references to disjoint address spaces
Date: Wed, 07 Mar 2018 17:48:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
On some targets where the address spaces are really separate, one kind of
memory and another kind of memory, I can see why assuming non-aliasing is fine.
But exactly on x86_64 I don't see how that could be safe, %fs/%gs simply are
the given addresses plus the segment base. You can access the same memory both
with
%gs:ptr1 and ptr2 where ptr2 is ptr1 + gs_segment_base, e.g. glibc uses for TLS
heavily both kinds of accesses.
>From gcc-bugs-return-596593-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 18:03:41 2018
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Subject: [Bug middle-end/84747] alias analysis reports may-conflict for references to disjoint address spaces
Date: Wed, 07 Mar 2018 18:03:00 -0000
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--- Comment #3 from Stefan M Freudenberger <stefan at reservoir dot com> ---
In this case I would have expected that TARGET_ADDR_SPACE_SUBSET_P will return
TRUE, as appropriate.
Granted, it would render my example invalid for x86.
>From gcc-bugs-return-596594-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 18:10:59 2018
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Subject: [Bug c++/84745] internal compiler error: Segmentation fault (main_block_label())
Date: Wed, 07 Mar 2018 18:10:00 -0000
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-07
CC| |dmalcolm at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Confirmed with trunk, gcc7 and gcc 6, and all the way back to at least 4.8.3
(using -std=c++11).
Program received signal SIGSEGV, Segmentation fault.
main_block_label (label=label@entry=0x7ffff18d5100) at
../../src/gcc/tree-cfg.c:1496
1496 tree main_label = label_for_bb[bb->index].label;
(gdb) p bb
$1 = <basic_block 0x0>
>From gcc-bugs-return-596595-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 18:25:55 2018
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Subject: [Bug c++/84733] [8 Regression] internal compiler error: Segmentation fault (check_local_shadow())
Date: Wed, 07 Mar 2018 18:25:00 -0000
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-07
CC| |dmalcolm at gcc dot gnu.org,
| |nathan at gcc dot gnu.org
Summary|internal compiler error: |[8 Regression] internal
|Segmentation fault |compiler error:
|(check_local_shadow()) |Segmentation fault
| |(check_local_shadow())
Ever confirmed|0 |1
--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Confirmed with trunk. gcc 7 and 6 show the output quoted above for 5.5.0,
with:
"confused by earlier errors, bailing out"
The trunk ICE is here:
Program received signal SIGSEGV, Segmentation fault.
check_local_shadow (decl=decl@entry=0x7ffff19d5b48) at
../../src/gcc/cp/name-lookup.c:2682
2682 if (scope->kind == sk_class
(gdb) p scope
$1 = (cp_binding_level *) 0x0
The segfault started somewhere between r248121 (unaffected) and r248123
(affected), probably r248123, so CCing Nathan.
Prior to that, the:
"confused by earlier errors, bailing out"
comes from this assertion failing in pop_local_binding:
405 gcc_assert (binding->type == decl);
masked in release builds by the "confused by earlier errors, bailing out"
post-error-ICE-handler. This failure started somewhere between r180695
(unaffected) and r180713 (affected).
>From gcc-bugs-return-596596-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 18:29:43 2018
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Subject: [Bug target/84209] [avr] Don't split SP in split2
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Georg-Johann Lay <gjl at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |7.4
--- Comment #4 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
Fixed in v7.4+
>From gcc-bugs-return-596597-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 18:50:30 2018
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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/59093] Segfault in gfc_trans_pointer_assignment
Date: Wed, 07 Mar 2018 18:50:00 -0000
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kargl at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
CC| |kargl at gcc dot gnu.org
--- Comment #15 from kargl at gcc dot gnu.org ---
(In reply to Matt Thompson from comment #14)
> Query: What version of GCC will fix this? It was reported fixed last year,
> but GCC 7.3.0 still ICEs out.
If you follow the links, you find
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=34640#c35
that is a fairly large intrusive patch. I suspect that
Paul did not backport to the 7-branch because of this.
So, the fix will be in 8.0 (or 8.1 can't remember what
the releasing scheme is).
>From gcc-bugs-return-596598-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 18:59:02 2018
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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/66128] ICE for some intrinsics with zero sized array parameter
Date: Wed, 07 Mar 2018 18:59:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
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--- Comment #16 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
I'll take a look at what's left (maxval for strings, at least)
and fix what is necessary to fix.
>From gcc-bugs-return-596599-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 19:00:02 2018
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From: "sudi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84521] [8 Regression] aarch64: Frame-pointer corruption with __builtin_setjmp/__builtin_longjmp and -fomit-frame-pointer
Date: Wed, 07 Mar 2018 19:00:00 -0000
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--- Comment #17 from sudi at gcc dot gnu.org ---
I looked up what other targets were doing and one thing found to be interesting
was that a lot of them are defining the target hook
TARGET_BUILTIN_SETJMP_FRAME_VALUE. In AArch64 case I am suggesting to define it
to return the hard frame pointer. That seems to solve the issue with both the
attached test case and the test that Wilco mentioned.
Does this look like it solves "mid-end versus back-end : who fixes this issue"
problem?
I am still pretty new to knowing how the stack should actually look. So calling
for some help!
Sudi
>From gcc-bugs-return-596600-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 19:03:47 2018
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Subject: [Bug fortran/66128] ICE for some intrinsics with zero sized array parameter
Date: Wed, 07 Mar 2018 19:03:00 -0000
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--- Comment #17 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Here's a problem with maxval:
$ cat maxval_parameter_2.f90
! { dg-do run }
program main
integer, dimension(0,3), parameter :: i = 0
integer, dimension(0,3) :: j = 0
print *,maxval(i,dim=1)
print *,maxval(j,dim=1)
end program main
$ gfortran maxval_parameter_2.f90
$ ./a.out
-2147483648
-2147483648 -2147483648 -2147483648
The run-time result is correct, the simplified version isn't.
>From gcc-bugs-return-596601-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 19:06:33 2018
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Subject: [Bug c++/84752] New: [8 Regression] ICE with constexpr array referenced in lambda
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Bug ID: 84752
Summary: [8 Regression] ICE with constexpr array referenced in
lambda
Product: gcc
Version: 8.0
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The following valid code snippet triggers an ICE on trunk:
===============================
void foo()
{
constexpr int x[1] = {};
[&x]{ return (bool)x; };
}
===============================
bug.cc: In lambda function:
bug.cc:4:22: internal compiler error: in build_address, at cp/typeck.c:5744
[&x]{ return (bool)x; };
^
0x66a78b build_address(tree_node*)
../../gcc/gcc/tree.h:3332
0x9dcaca cp_build_addr_expr_1
../../gcc/gcc/cp/typeck.c:5974
0x9ddede cp_build_addr_expr(tree_node*, int)
../../gcc/gcc/cp/typeck.c:6020
0x9ddede decay_conversion(tree_node*, int, bool)
../../gcc/gcc/cp/typeck.c:2082
0x8236df convert_like_real
../../gcc/gcc/cp/call.c:7087
0x823045 convert_like_real
../../gcc/gcc/cp/call.c:6912
0x82cbe2 perform_direct_initialization_if_possible(tree_node*, tree_node*,
bool, int)
../../gcc/gcc/cp/call.c:10665
0x9e3b36 build_static_cast_1
../../gcc/gcc/cp/typeck.c:7035
0x9e7dc7 cp_build_c_cast(tree_node*, tree_node*, int)
../../gcc/gcc/cp/typeck.c:7796
0x9e807a build_c_cast(unsigned int, tree_node*, cp_expr)
../../gcc/gcc/cp/typeck.c:7704
0x915d21 cp_parser_cast_expression
../../gcc/gcc/cp/parser.c:9079
0x91628a cp_parser_binary_expression
../../gcc/gcc/cp/parser.c:9191
0x917ac4 cp_parser_assignment_expression
../../gcc/gcc/cp/parser.c:9486
0x9181d8 cp_parser_expression
../../gcc/gcc/cp/parser.c:9655
0x920a26 cp_parser_jump_statement
../../gcc/gcc/cp/parser.c:12415
0x920a26 cp_parser_statement
../../gcc/gcc/cp/parser.c:10829
0x9217f0 cp_parser_statement_seq_opt
../../gcc/gcc/cp/parser.c:11274
0x9222c7 cp_parser_lambda_body
../../gcc/gcc/cp/parser.c:10685
0x9222c7 cp_parser_lambda_expression
../../gcc/gcc/cp/parser.c:10186
0x9222c7 cp_parser_primary_expression
../../gcc/gcc/cp/parser.c:5261
Please submit a full bug report, [etc.]
The regression was introduced between 2017-09-26 and 2017-10-07.
>From gcc-bugs-return-596602-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 19:09:50 2018
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Subject: [Bug c++/84733] [8 Regression] internal compiler error: Segmentation fault (check_local_shadow())
Date: Wed, 07 Mar 2018 19:09:00 -0000
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Nathan Sidwell <nathan at gcc dot gnu.org> changed:
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>From gcc-bugs-return-596603-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 19:15:39 2018
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From: "jamborm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/84149] [8 Regression] SPEC CPU2017 505.mcf/605.mcf ~10% performance regression with r256888
Date: Wed, 07 Mar 2018 19:15:00 -0000
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Martin Jambor <jamborm at gcc dot gnu.org> changed:
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CC| |hubicka at gcc dot gnu.org
--- Comment #4 from Martin Jambor <jamborm at gcc dot gnu.org> ---
In my (more recent) checkout of trunk, the estimated benefit is even
lower, only 270. Raising devirtualization hint to compensate seems
excessive, I need:
diff --git a/gcc/ipa-cp.c b/gcc/ipa-cp.c
index ee41a8d55b7..09ba92ef14d 100644
--- a/gcc/ipa-cp.c
+++ b/gcc/ipa-cp.c
@@ -2612,6 +2612,25 @@ devirtualization_time_bonus (struct cgraph_node *node,
res += 7 / ((int)speculative + 1);
}
+ if (res)
+ /* Devirtualization is likely more important in recursive callers because
+ those cannot be entirely inlined themselves. */
+ for (cgraph_edge *e = node->callees; e; e = e->next_callee)
+ {
+ enum availability avail;
+ cgraph_node *callee = e->callee->function_symbol (&avail);
+ if (e->caller == callee
+ && avail >= AVAIL_AVAILABLE)
+ {
+ res = 8 * res;
+
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "Recursive devirtualization bohus %i\n",
+ res);
+ break;
+ }
+ }
+
return res;
}
Which is excessive (but it may make sense to boost IPA-CP bonuses for
self-recursive functions a bit since those cannot be dealt with
completely by inlining). Nevertless I already have a prototype patch which
can explain to IPA-CP that only there is only one remaining value in the
contexts for which we did not clone and replace it there too.
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Subject: [Bug c++/84752] [8 Regression] ICE with constexpr array referenced in lambda
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-07
CC| |jakub at gcc dot gnu.org,
| |jason at gcc dot gnu.org
Target Milestone|--- |8.0
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r253266.
>From gcc-bugs-return-596605-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 19:23:08 2018
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From: "jamborm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/84149] [8 Regression] SPEC CPU2017 505.mcf/605.mcf ~10% performance regression with r256888
Date: Wed, 07 Mar 2018 19:23:00 -0000
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--- Comment #5 from Martin Jambor <jamborm at gcc dot gnu.org> ---
Created attachment 43588
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43588&action=edit
Prototype patch
I have to leave the office now but this is the (only very very lightly tested)
prototype patch that fixes the regression as described above. It still needs a
bit of care before submitting, however.
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Subject: [Bug tree-optimization/84468] [8 Regression] bogus -Wstringop-truncation despite assignment after conditional strncpy
Date: Wed, 07 Mar 2018 19:31:00 -0000
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--- Comment #17 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Wed Mar 7 19:30:31 2018
New Revision: 258339
URL: https://gcc.gnu.org/viewcvs?rev=258339&root=gcc&view=rev
Log:
PR tree-optimization/84468 - bogus -Wstringop-truncation despite assignment
after conditional strncpy
gcc/ChangeLog:
PR tree-optimization/84468
* tree-ssa-strlen.c (maybe_diag_stxncpy_trunc): Consider successor
basic block when looking for nul assignment.
gcc/testsuite/ChangeLog:
PR tree-optimization/84468
* g++.dg/warn/Wstringop-truncation-2.C: New test.
* gcc.dg/Wstringop-truncation.c: New test.
* gcc.dg/Wstringop-truncation-2.c: New test.
Added:
trunk/gcc/testsuite/g++.dg/warn/Wstringop-truncation-2.C
trunk/gcc/testsuite/gcc.dg/Wstringop-truncation-2.c
trunk/gcc/testsuite/gcc.dg/Wstringop-truncation.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/warn/Wstringop-truncation-1.C
trunk/gcc/tree-ssa-strlen.c
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Subject: [Bug tree-optimization/84468] [8 Regression] bogus -Wstringop-truncation despite assignment after conditional strncpy
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #18 from Martin Sebor <msebor at gcc dot gnu.org> ---
Fixed with r258339 on trunk. For GCC 9 I'll look into something more
sophisticated.
>From gcc-bugs-return-596608-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 19:41:35 2018
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Subject: [Bug c++/59704] Wrong overload chosen, compiler errornously thinks non-constant zero expression is implicitly castable to null pointer
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Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> changed:
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--- Comment #2 from Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> ---
Here is another example:
https://wandbox.org/permlink/UYsLyMaLcBb6sjJa
GCC incorrectly considers `int()` to be a null pointer constant.
Notice that GCC correctly handles `int{}` with curly braces; it gets confused
only about `int()` with parens.
#include <stdio.h>
void foo(const char *) {}
template<class T> decltype(foo(T())) red(T) { puts("yes"); }
void red(...) { puts("no"); }
int main() {
foo(int()); // should not compile
red(1); // should print "no", not "yes"
}
>From gcc-bugs-return-596609-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 20:00:39 2018
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Subject: [Bug tree-optimization/84737] [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888
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--- Comment #2 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
Created attachment 43589
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43589&action=edit
ipa-cp dump
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Subject: [Bug tree-optimization/84737] [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888
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--- Comment #3 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #1)
> Isn't that dup of 84149? Can you please tweak --param ipa-cp-eval-threshold
> to value to 200, 300, 400? Can you please attach -fdump-ipa-cp-details file?
I tried the param with the 3 different values and none made any difference to
execution time.
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Subject: [Bug c++/84744] cannot use glibc 2.27 with gcc 7.3
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Jim Wilson <wilson at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |wilson at gcc dot gnu.org
--- Comment #9 from Jim Wilson <wilson at gcc dot gnu.org> ---
Building and using glibc is complicated. It is best to refer to a FAQ if you
haven't done this before. You can find some info on the glibc wiki about this
here:
https://sourceware.org/glibc/wiki/Testing/Builds
You probably want item 5.
It is a little simpler if you build a gcc that is set up to use your glibc
build, which requires building a complete toolchain from scratch. If you want
to learn how to do this, it is best to look at someone else's scripts showing
how to do it. Every linux distro has scripts for this. I like to use
crosstools-ng. You can find some info on how to build a toolchain here:
https://crosstool-ng.github.io/docs/toolchain-construction/
and look at the scripts if you want the details of how this works.
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Subject: [Bug target/82411] const is not always read-only
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--- Comment #6 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Wed Mar 7 20:27:11 2018
New Revision: 258340
URL: https://gcc.gnu.org/viewcvs?rev=258340&root=gcc&view=rev
Log:
rs6000: -mreadonly-in-sdata (PR82411)
This adds a new option -mreadonly-in-sdata (on by default) that
controls whether readonly data can be put in sdata. (For EABI this
does nothing, readonly data is put in sdata2 as usual).
PR target/82411
* config/rs6000/rs6000.c (rs6000_elf_in_small_data_p): Don't put
readonly data in sdata, if that is disabled.
* config/rs6000/sysv4.opt (mreadonly-in-sdata): New option.
* doc/invoke.texi (RS/6000 and PowerPC Options): Document
-mreadonly-in-sdata option.
gcc/testsuite/
PR target/82411
* gcc.target/powerpc/ppc-sdata-2.c: Skip if -mno-readonly-in-sdata.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/rs6000/rs6000.c
trunk/gcc/config/rs6000/sysv4.opt
trunk/gcc/doc/invoke.texi
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/powerpc/ppc-sdata-2.c
>From gcc-bugs-return-596613-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 20:29:23 2018
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Subject: [Bug target/82411] const is not always read-only
Date: Wed, 07 Mar 2018 20:29:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #7 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Done on trunk; backports pending.
>From gcc-bugs-return-596614-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 21:19:13 2018
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From: "noloader at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/84753] New: GCC does not fold xxswapd followed by vperm
Date: Wed, 07 Mar 2018 21:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84753
Bug ID: 84753
Summary: GCC does not fold xxswapd followed by vperm
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: noloader at gmail dot com
Target Milestone: ---
I'm working on GCC112 from the compile farm. It is ppc64-le machine. It has
both GCC 4.8.5 and GCC 7.2.0 installed. The issue is present on both.
We are trying to recover missing 1 to 2 cpb performance when using Power8 SHA
built-ins. Part of the code to load a message into the message schedule looks
like so:
uint8_t msg[64] = {...};
__vector unsigned char mask = {3,2,1,0, 7,6,5,4, 11,10,9,8, 15,14,13,12};
__vector unsigned int t = vec_vsx_ld(0, msg);
t = vec_perm(t, t, mask);
When I compile at -O3 and disassemble it, I see:
100008bc: 99 26 20 7c lxvd2x vs33,0,r4
...
100008d0: 57 0a 21 f0 xxswapd vs33,vs33
100008d8: 2b 08 21 10 vperm v1,v1,v1,v0
Calling xxswapd followed by vperm seems to be a lot like calling shuffle_epi32
followed by shuffle_epi8 on an x86 machine. It feels like the two permutes
should be folded into one.
On x86 I would manually fold the two shuffles. On PPC I cannot because xxswapd
is generated as part of the load, and then I call vperm. I have not figured out
how to avoid the xxswapd. (I even tried to issue my own xxswapd to cancel out
the one being generated by the compiler).
**********
Here's a minimal case, but the optimizer is removing the code of interest. The
real code suffers it, and it can be found at
https://github.com/noloader/SHA-Intrinsics/blob/master/sha256-p8.cxx .
$ cat test.cxx
#include <stdint.h>
#if defined(__ALTIVEC__)
# include <altivec.h>
# undef vector
# undef pixel
# undef bool
#endif
typedef __vector unsigned char uint8x16_p8;
typedef __vector unsigned int uint32x4_p8;
// Unaligned load
template <class T> static inline
uint32x4_p8 VectorLoad32x4u(const T* data, int offset)
{
return vec_vsx_ld(offset, (uint32_t*)data);
}
// Unaligned store
template <class T> static inline
void VectorStore32x4u(const uint32x4_p8 val, T* data, int offset)
{
vec_vsx_st(val, offset, (uint32_t*)data);
}
static inline
uint32x4_p8 VectorPermute32x4(const uint32x4_p8 val, const uint8x16_p8 mask)
{
return (uint32x4_p8)vec_perm(val, val, mask);
}
int main(int argc, char* argv[])
{
uint8_t M[64];
uint32_t W[64];
uint8_t* m = M;
uint32_t* w = W;
const uint8x16_p8 mask = {3,2,1,0, 7,6,5,4, 11,10,9,8, 15,14,13,12};
for (unsigned int i=0; i<16; i+=4, m+=4, w+=4)
VectorStore32x4u(VectorPermute32x4(VectorLoad32x4u(m, 0), mask), w, 0);
return 0;
}
>From gcc-bugs-return-596615-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 21:46:03 2018
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Subject: [Bug rtl-optimization/84753] GCC does not fold xxswapd followed by vperm
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Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |wschmidt at gcc dot gnu.org
Resolution|--- |INVALID
--- Comment #1 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
GCC 4.8.5 is out of service. This is fixed in all in-service versions of GCC
(6.4 and later).
>From gcc-bugs-return-596616-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 21:52:31 2018
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Subject: [Bug rtl-optimization/84753] GCC does not fold xxswapd followed by vperm
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--- Comment #2 from Jeffrey Walton <noloader at gmail dot com> ---
(In reply to Bill Schmidt from comment #1)
> GCC 4.8.5 is out of service. This is fixed in all in-service versions of
> GCC (6.4 and later).
Interesting. I'm seeing it in GCC 7.2.0. Are you certain of this?
>From gcc-bugs-return-596617-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 21:55:43 2018
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Subject: [Bug rtl-optimization/84753] GCC does not fold xxswapd followed by vperm
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--- Comment #3 from Jeffrey Walton <noloader at gmail dot com> ---
(In reply to Jeffrey Walton from comment #2)
> (In reply to Bill Schmidt from comment #1)
> > GCC 4.8.5 is out of service. This is fixed in all in-service versions of
> > GCC (6.4 and later).
>
> Interesting. I'm seeing it in GCC 7.2.0. Are you certain of this?
Here's an example to make sure we are on the same page.
$ /opt/cfarm/gcc-latest/bin/g++ --version
g++ (GCC) 7.2.0
$ /opt/cfarm/gcc-latest/bin/g++ -g3 -O3 -Wall -DTEST_MAIN -mcpu=power8
sha256-p8.cxx -o sha256-p8.exe
$ objdump --disassemble sha256-p8.exe | c++filt
0000000010000880 <SHA256_SCHEDULE(unsigned int*, unsigned char const*)>:
10000880: 03 10 40 3c lis r2,4099
10000884: 00 81 42 38 addi r2,r2,-32512
10000888: f0 ff c1 fb std r30,-16(r1)
1000088c: f8 ff e1 fb std r31,-8(r1)
10000890: fe ff 22 3d addis r9,r2,-2
10000894: 10 00 c4 3b addi r30,r4,16
10000898: 70 8e 29 39 addi r9,r9,-29072
1000089c: 10 00 e3 3b addi r31,r3,16
100008a0: 20 00 84 39 addi r12,r4,32
100008a4: 20 00 63 39 addi r11,r3,32
100008a8: 99 4e 00 7c lxvd2x vs32,0,r9
100008ac: 30 00 a3 38 addi r5,r3,48
100008b0: 40 00 23 39 addi r9,r3,64
100008b4: c4 ff c0 38 li r6,-60
100008b8: c0 ff e0 38 li r7,-64
100008bc: 99 26 20 7c lxvd2x vs33,0,r4
100008c0: 30 00 84 38 addi r4,r4,48
100008c4: f8 ff 00 39 li r8,-8
100008c8: e4 ff 40 39 li r10,-28
100008cc: 57 02 00 f0 xxswapd vs32,vs32
100008d0: 57 0a 21 f0 xxswapd vs33,vs33
100008d4: 97 05 00 f0 xxlnand vs32,vs32,vs32
100008d8: 2b 08 21 10 vperm v1,v1,v1,v0
100008dc: 57 0a 21 f0 xxswapd vs33,vs33
100008e0: 99 1f 20 7c stxvd2x vs33,0,r3
100008e4: 18 00 60 38 li r3,24
100008e8: a6 03 69 7c mtctr r3
100008ec: 99 f6 20 7c lxvd2x vs33,0,r30
100008f0: 57 0a 21 f0 xxswapd vs33,vs33
100008f4: 2b 08 21 10 vperm v1,v1,v1,v0
100008f8: 57 0a 21 f0 xxswapd vs33,vs33
100008fc: 99 ff 20 7c stxvd2x vs33,0,r31
10000900: 99 66 20 7c lxvd2x vs33,0,r12
10000904: 57 0a 21 f0 xxswapd vs33,vs33
10000908: 2b 08 21 10 vperm v1,v1,v1,v0
1000090c: 57 0a 21 f0 xxswapd vs33,vs33
10000910: 99 5f 20 7c stxvd2x vs33,0,r11
10000914: 99 26 20 7c lxvd2x vs33,0,r4
10000918: 57 0a 21 f0 xxswapd vs33,vs33
1000091c: 2b 08 01 10 vperm v0,v1,v1,v0
10000920: 57 02 00 f0 xxswapd vs32,vs32
10000924: 99 2f 00 7c stxvd2x vs32,0,r5
10000928: 00 00 00 60 nop
1000092c: 00 00 42 60 ori r2,r2,0
10000930: 99 36 09 7c lxvd2x vs32,r9,r6
10000934: 99 3e 89 7d lxvd2x vs44,r9,r7
10000938: 99 56 a9 7d lxvd2x vs45,r9,r10
1000093c: 99 46 29 7c lxvd2x vs33,r9,r8
10000940: 82 06 00 10 vshasigmaw v0,v0,0,0
10000944: 82 7e 21 10 vshasigmaw v1,v1,0,15
10000948: 80 60 00 10 vadduwm v0,v0,v12
1000094c: 80 68 00 10 vadduwm v0,v0,v13
10000950: 80 08 00 10 vadduwm v0,v0,v1
10000954: 99 4f 00 7c stxvd2x vs32,0,r9
10000958: 08 00 29 39 addi r9,r9,8
1000095c: d4 ff 00 42 bdnz 10000930 <SHA256_SCHEDULE(unsigned
int*, unsigned char const*)+0xb0>
10000960: f0 ff c1 eb ld r30,-16(r1)
10000964: f8 ff e1 eb ld r31,-8(r1)
10000968: 20 00 80 4e blr
1000096c: 00 00 00 00 .long 0x0
10000970: 00 09 00 00 .long 0x900
10000974: 00 02 00 00 attn
10000978: 00 00 00 60 nop
1000097c: 00 00 42 60 ori r2,r2,0
>From gcc-bugs-return-596618-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 23:03:06 2018
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Subject: [Bug tree-optimization/83456] -Wrestrict false positive on a non-overlapping memcpy in an inline function
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |patch
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2018-03/msg00358.html
>From gcc-bugs-return-596619-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 07 23:07:34 2018
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Subject: [Bug target/83712] [6/7/8 Regression] "Unable to find a register to spill" when compiling for thumb1
Date: Wed, 07 Mar 2018 23:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83712
--- Comment #6 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
I've decided to fix it in RA because it could help to fix analogous bugs when
existing hard reg splitting code fails. This particular bug is more complicated
because it happens for non-small reg class. It requires a lot of changes in
LRA and changing its sub-pass flow.
I've been working on this PR for some time and now I can say that it will
probably fixed on this week.
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From: "wschmidt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/84753] GCC does not fold xxswapd followed by vperm
Date: Thu, 08 Mar 2018 00:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84753
Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |UNCONFIRMED
Resolution|INVALID |---
--- Comment #4 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
OK, I see. We optimize swapped vperm in most cases as part of a general
swap-optimization algorithm. However, this algorithm is defeated when there is
a mix of loads/stores accompanied by swaps and loads/stores that are not
accompanied by swaps. The "big-endian" loads that are used with vshasigmaw and
friends are the problem here. (This problem goes away with Power9, but doesn't
help you here.)
There is a slight possibility we can address this in GCC 8, but it is unlikely,
as the code base is closed except for regression fixes. In any case, a
solution would still keep some swap instructions in place, and thus would not
be ideal. (I.e., we can fold a swap and a vperm when the result of the swap is
not used elsewhere, but other swaps associated with loads and stores will still
be present.) So I don't think we should go this route.
The best performance will be achieved by writing this loop entirely using
inline asm code, with all data loaded/stored using lxvd2x and stxvd2x (no
swaps), thus in "big-endian element order" (element 0 in the high-order
position of the register). Because of the big-endian nature of vshasigmaw,
this is always going to be the best approach.
I am still poking the bushes for a reference implementation; I thought of
another person to ask while writing this note. Will let you know what I find
out.
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Subject: [Bug rtl-optimization/84753] GCC does not fold xxswapd followed by vperm
Date: Thu, 08 Mar 2018 00:09:00 -0000
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--- Comment #5 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
s/this loop/this function
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Subject: [Bug fortran/64124] [F95] Valid constant expr rejected
Date: Thu, 08 Mar 2018 00:43:00 -0000
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--- Comment #3 from kargl at gcc dot gnu.org ---
Author: kargl
Date: Thu Mar 8 00:42:41 2018
New Revision: 258347
URL: https://gcc.gnu.org/viewcvs?rev=258347&root=gcc&view=rev
Log:
2018-03-07 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/64124
PR fortran/70409
* decl.c (gfc_match_char_spec): Try to reduce a charlen to a constant.
2018-03-07 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/64124
PR fortran/70409
* gfortran.dg/pr64124.f90: New tests.
* gfortran.dg/pr70409.f90: New tests.
Added:
trunk/gcc/testsuite/gfortran.dg/pr64124.f90
trunk/gcc/testsuite/gfortran.dg/pr70409.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/decl.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/70409] Silent truncation of character parameters with len=huge()
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--- Comment #3 from kargl at gcc dot gnu.org ---
Author: kargl
Date: Thu Mar 8 00:42:41 2018
New Revision: 258347
URL: https://gcc.gnu.org/viewcvs?rev=258347&root=gcc&view=rev
Log:
2018-03-07 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/64124
PR fortran/70409
* decl.c (gfc_match_char_spec): Try to reduce a charlen to a constant.
2018-03-07 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/64124
PR fortran/70409
* gfortran.dg/pr64124.f90: New tests.
* gfortran.dg/pr70409.f90: New tests.
Added:
trunk/gcc/testsuite/gfortran.dg/pr64124.f90
trunk/gcc/testsuite/gfortran.dg/pr70409.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/decl.c
trunk/gcc/testsuite/ChangeLog
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84754] New: missing -Wrestrict on a possible strcpy overlap with constant offset
Date: Thu, 08 Mar 2018 00:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84754
Bug ID: 84754
Summary: missing -Wrestrict on a possible strcpy overlap with
constant offset
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
-Wrestrict triggers for a strcpy call from a string of unknown length and
unknown offset but not the same call with a constant offset, even though the
latter seems more likely to overlap than the former (the smaller the offset the
more likely the cooy is to overlap). In any case, unlike for memcpy, for
string functions -Wrestrict is specifically meant to warn even for possible
overlaps (i.e., when copying into the same array) so this is a bug, not just a
missing feature or design choice.
$ cat z.c && gcc -O2 -S -Wall -fdump-tree-wrestrict=/dev/stdout z.c
char a[32];
void f (int i)
{
__builtin_strcpy (a, a + i); // -Wrestrict (good)
}
void g (void)
{
__builtin_strcpy (a, a + 1); // missing -Wrestrict
}
;; Function f (f, funcdef_no=0, decl_uid=1959, cgraph_uid=0, symbol_order=1)
z.c: In function ‘f’:
z.c:5:3: warning: ‘__builtin_strcpy’ accessing 1 byte at offsets 0 and [0, 32]
may overlap 1 byte at offset 0 [-Wrestrict]
__builtin_strcpy (a, a + i); // -Wrestrict (good)
^~~~~~~~~~~~~~~~~~~~~~~~~~~
f (int i)
{
sizetype _1;
const char * _2;
<bb 2> [local count: 1073741825]:
_1 = (sizetype) i_3(D);
_2 = &a + _1;
__builtin_strcpy (&a, _2);
return;
}
;; Function g (g, funcdef_no=1, decl_uid=1962, cgraph_uid=1, symbol_order=2)
g ()
{
<bb 2> [local count: 1073741825]:
__builtin_strcpy (&a, &MEM[(void *)&a + 1B]);
return;
}
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Subject: [Bug tree-optimization/83519] missing -Wrestrict on an overlapping strcpy to a non-member array
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--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Thu Mar 8 00:56:07 2018
New Revision: 258348
URL: https://gcc.gnu.org/viewcvs?rev=258348&root=gcc&view=rev
Log:
PR tree-optimization/83519 - missing -Wrestrict on an overlapping strcpy to a
non-member array
gcc/testsuite/ChangeLog:
* gcc.dg/Wrestrict-13.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/Wrestrict-13.c
Modified:
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug tree-optimization/83519] missing -Wrestrict on an overlapping strcpy to a non-member array
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
This was fixed by r256180:
r256180 | prathamesh3492 | 2018-01-03 11:07:32 -0500 (Wed, 03 Jan 2018) | 9
lines
2018-01-03 Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>
PR tree-optimization/83501
* tree-ssa-strlen.c (get_string_cst): New.
(handle_char_store): Call get_string_cst.
>From gcc-bugs-return-596627-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 01:03:35 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/81269] wrong color highlighting in -Wrestrict warnings
Date: Thu, 08 Mar 2018 01:03:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
The -Wrestrict patch for sprintf wasn't approved for GCC 8 so this is not
really an issue at the moment. Resolving as invalid based on comment #2.
>From gcc-bugs-return-596628-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 01:22:26 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/60256] No -Wuninitialized warning for strcpy copying to self
Date: Thu, 08 Mar 2018 01:22:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail|7.0 |7.3.0, 8.0
--- Comment #10 from Martin Sebor <msebor at gcc dot gnu.org> ---
GCC 8 issues a -Wrestrict warning for the test case in comment #0 but still no
-Wuninitialized. I agree that issuing -Wuninitialized will be difficult
because (as noted in comment #5) the call is folded too early to tell whether
the argument is valid (either initialized or assigned to) prior to the call.
The only way I can think of is to delay the folding until it is known and that
has not been a popular idea in the past.
$ cat pr60256.c && gcc -O2 -S -Wall pr60256.c
#include <string.h>
void f(void) {
char* s;
strcpy(s, s);
}
pr60256.c: In function ‘f’:
pr60256.c:4:3: warning: ‘strcpy’ source argument is the same as destination
[-Wrestrict]
strcpy(s, s);
^~~~~~~~~~~~
>From gcc-bugs-return-596629-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 01:24:45 2018
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Subject: [Bug c/60256] No -Wuninitialized warning for strcpy copying to self
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=83456
--- Comment #11 from Martin Sebor <msebor at gcc dot gnu.org> ---
I should mention that even the -Wrestrict warning runs into problems this early
-- see bug 83456.
>From gcc-bugs-return-596630-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 01:25:43 2018
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Subject: [Bug fortran/49278] ICE (segfault) when combining DATA with default initialization
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Jürgen Reuter <juergen.reuter at desy dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |juergen.reuter at desy dot de
--- Comment #15 from Jürgen Reuter <juergen.reuter at desy dot de> ---
I just stumbled over this again while reading c.l.f. This still is ICEing with
8.0.1. If it is inconsistent code as the c.l.f. discussion and the J3 answer to
the interpretation request point out, this should be caught with an exception.
>From gcc-bugs-return-596631-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 01:31:23 2018
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Subject: [Bug fortran/49278] ICE (segfault) when combining DATA with default initialization
Date: Thu, 08 Mar 2018 01:31:00 -0000
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--- Comment #16 from Jürgen Reuter <juergen.reuter at desy dot de> ---
In addition to what Tobias remarked, NAG now gives a clear error message:
NAG Fortran Compiler Release 6.1(Tozai) Build 6138
Error: data.f90, line 13: Object TRLKOLD of type ACTIVE is default-initialised,
therefore subobject TRLKOLD%V is not permitted in a DATA statement
Intel in v18.0.1 still does not give a compilation or runtime error.
>From gcc-bugs-return-596632-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 01:46:07 2018
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Subject: [Bug c/84755] New: GCC 4.6.0 build error with GCC-4.8.5 in Ubuntu 16.04 LTS
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Bug ID: 84755
Summary: GCC 4.6.0 build error with GCC-4.8.5 in Ubuntu 16.04
LTS
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
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Created attachment 43590
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43590&action=edit
make all-target-libgcc error log
Hello, gcc
I have an compile error when building GCC 4.6.0
My host env is Ubuntu 16.04 64bit LTS (kernel was installed 4.13.0-36-generic)
and
gcc-4.8.5
=============================================================================
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.8.5-4ubuntu2'
--with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.8 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap
--enable-plugin --with-system-zlib --disable-browser-plugin
--enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686
--with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.8.5 (Ubuntu 4.8.5-4ubuntu2)
=============================================================================
I downloaded, compiled and installed : M4(1.4.18), GMP(5.0.3), MPFR(3.0.1),
MPC(0.9), PPL(0.11.2), CLoog-PPL(0.15.11), BinUtils(2.21.1a)
Before GCC-4.6.0 Configuring, I patched 3 files : (attached file)
- gcc-4.6.0-branch_update-1.patch
- gcc-4.6.0-pure64_specs-1.patch
- gcc-4.6.0-jslim.patch
I GCC-4.6.0 configured like this:
AR=ar LDFLAGS="-Wl,-rpath,/home/jslim/toolchain/cross-tools/lib"
../gcc-4.6.0/configure --prefix=/home/jslim/toolchain/cross-tools
--build=x86_64-cross-linux-gnu --host=x86_64-cross-linux-gnu
--target=x86_64-unknown-linux-gnu --with-sysroot=/home/jslim/toolchain
--with-local-prefix=/home/jslim/toolchain/tools --disable-nls --disable-shared
--with-mpfr=/home/jslim/toolchain/cross-tools
--with-gmp=/home/jslim/toolchain/cross-tools
--with-ppl=/home/jslim/toolchain/cross-tools
--with-cloog=/home/jslim/toolchain/cross-tools --without-headers --with-newlib
--disable-decimal-float --disable-libgomp --disable-libmudflap --disable-libssp
--disable-threads --enable-languages=c --disable-multilib
* I attached "config.log" file
GCC-4.6.0 Configuring done, and I followed make steps like this:
make all-gcc // This step seemed fine. (attached
"compile_all-gcc.log" file)
make all-target-libgcc // This step failed. I attached
"compile_all-target-libgcc.log" file
Please help me.
I hope let me know what was fault and how to do.
Thanks.
PS. this bug reporting can attachment only one file. So, I attached
"compile_all-target-libgcc.log" file only. If you want more files(config.log,
patch files ...), plz request for me.
>From gcc-bugs-return-596634-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 01:50:40 2018
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Subject: [Bug c/84755] GCC 4.6.0 build error with GCC-4.8.5 in Ubuntu 16.04 LTS
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--- Comment #2 from June,Lim <lux1075 at naver dot com> ---
Created attachment 43592
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GCC-4.6.0 configure log
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Subject: [Bug c/84755] GCC 4.6.0 build error with GCC-4.8.5 in Ubuntu 16.04 LTS
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--- Comment #1 from June,Lim <lux1075 at naver dot com> ---
Created attachment 43591
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43591&action=edit
make all-gcc log
>From gcc-bugs-return-596635-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 03:02:24 2018
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Subject: [Bug target/34452] Multiply-by-constant pessimation
Date: Thu, 08 Mar 2018 03:02:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=30354,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=28417
--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Bernhard Reutner-Fischer from comment #4)
> Is this realted to PR30354 and/or PR28417 ?
Possibly, let's find out by putting them under "See Also" and seeing if anyone
confirms.
>From gcc-bugs-return-596636-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 03:14:11 2018
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Subject: [Bug middle-end/34516] trivial sentinels
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> And why don't you submit it????
I'm assuming it has something to do with this bug being filed around the time
of the GPL3 transition...
>From gcc-bugs-return-596637-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 03:17:26 2018
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Subject: [Bug target/28508] Assembler Error: operand out of range (145 not between -128 and 127) form m32r-target
Date: Thu, 08 Mar 2018 03:17:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |egallager at gcc dot gnu.org
Resolution|--- |FIXED
--- Comment #9 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Debian GCC Maintainers from comment #8)
> please mark it as closed, if it is not a candidate for a backport.
>
> Matthias
OK.
>From gcc-bugs-return-596638-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 03:20:53 2018
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Subject: [Bug target/35365] dlopen fails because of missing _Jv_RegisterClasses under HP-UX 11.11
Date: Thu, 08 Mar 2018 03:20:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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CC| |egallager at gcc dot gnu.org
Resolution|--- |INVALID
--- Comment #1 from Eric Gallager <egallager at gcc dot gnu.org> ---
_Jv_RegisterClasses is a Java thing, and Java has been removed from newer
versions of GCC, so I'm going to close this.
>From gcc-bugs-return-596639-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 03:26:07 2018
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Subject: [Bug target/20802] mmix-knuth-mmixware testsuite failure: gcc.dg/builtin-apply4.c execution
Date: Thu, 08 Mar 2018 03:26:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
Known to work| |4.1.0
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=20076
Known to fail| |3.4.0, 4.2.0, 4.3.0
--- Comment #8 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Rob from comment #7)
> I tried this on i686-pc-linux-gnu using gcc-3.4 (from Debian), gcc-4.1 (from
> Debian), gcc version 4.2.0 20070501 (prerelease) (from SVN), and gcc version
> 4.3.0 20070607 (experimental) (from SVN):
>
> I modified as follows:
>
> /* PR tree-optimization/20076 */
> /* { dg-options "-O2" } */
> /* { dg-do run } */
>
> extern void abort (void);
>
> double
> foo (int arg)
> {
> printf("foo1 - arg = %u \n", arg);
> if (arg != 116)
> abort();
> printf("foo2 - arg = %u \n", arg);
> return arg + 1;
> }
>
> inline double
> bar (int arg)
> {
> printf("bar1 - arg = %u \n", arg);
> foo (arg);
> printf("bar2 - arg = %u \n", arg);
> __builtin_return (__builtin_apply ((void (*) ()) foo, __builtin_apply_args
> (), 128));
> __builtin_return (__builtin_apply ((void (*) ()) foo, __builtin_apply_args
> (), 32));
> __builtin_return (__builtin_apply ((void (*) ()) foo, __builtin_apply_args
> (), 16));
> printf("bar3 - arg = %u \n", arg);
> }
>
> int
> main (int argc, char **argv)
> {
> printf("main1 - pre bar\n");
> if (bar (116) != 117.0) {
> printf("main2 - post bar - abort\n");
> abort ();
> }
> printf("main2 - post bar - no abort\n");
> return 0;
> }
>
>
> The printf statments are the only changes, everything else is the same as
> 4.3.0.
>
> Here is what the .exe's print for each version of gcc:
>
> # ./builtin-apply4_gcc3.4.exe
> main1 - pre bar
> bar1 - arg = 116
> foo1 - arg = 116
> foo2 - arg = 116
> bar2 - arg = 116
> foo1 - arg = 1
> Aborted
>
> # ./builtin-apply4_gcc4.1.exe
> main1 - pre bar
> bar1 - arg = 116
> foo1 - arg = 116
> foo2 - arg = 116
> bar2 - arg = 116
> foo1 - arg = 116
> foo2 - arg = 116
> main2 - post bar - no abort
>
> # ./builtin-apply4_gcc4.2.exe
> main1 - pre bar
> bar1 - arg = 116
> foo1 - arg = 116
> foo2 - arg = 116
> bar2 - arg = 116
> foo1 - arg = 116
> foo2 - arg = 116
> main2 - post bar - abort
> Aborted
>
> # ./builtin-apply4_4.3.exe
> main1 - pre bar
> bar1 - arg = 116
> foo1 - arg = 116
> foo2 - arg = 116
> bar2 - arg = 116
> foo1 - arg = 116
> foo2 - arg = 116
> main2 - post bar - abort
> Aborted
>
>
> GCC 3.4 prints "foo1 - arg = 1" - which is way off.
>
> GCC 4.1 prints "main2 - post bar - no abort" - which means it is OK
>
> The others are incorrect. I do not have 4.0.0 to confirm this report but you
> might says it was fixed in 4.1 - only to re-occur in later versions :( .
>
> I'd change the known to fail field but I don't have permission.
I changed it for you.
>From gcc-bugs-return-596640-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 03:27:47 2018
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Subject: [Bug libgomp/35614] libgomp info documentation file is in the wrong category
Date: Thu, 08 Mar 2018 03:27:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |documentation, easyhack,
| |patch
CC| |egallager at gcc dot gnu.org
--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Sahak Petrosyan from comment #3)
> I posted the patch to the mailing list:
> http://gcc.gnu.org/ml/gcc-patches/2008-03/msg01639.html
Adding "patch" keyword (among others)
>From gcc-bugs-return-596641-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 03:32:55 2018
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Subject: [Bug middle-end/26061] error and warning count
Date: Thu, 08 Mar 2018 03:32:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org,
| |egallager at gcc dot gnu.org
--- Comment #21 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Kevin André from comment #20)
> (In reply to comment #19)
>
> > I really don't want to make it default off as it's really useful. I hope to fix
> > the patch and make it default on for gcc 4.4 at least.
>
> I agree. What's the status for getting it into 4.4?
>
> People complain that changing GCC's output will break tools that parse that
> output. I can understand why they're complaining, but IMHO this reveals a
> more fundamental problem. The current diagnostic output tries to serve two
> purposes: being readable for humans and being parseable by tools. And I
> think those two should be separated. Why not have the default output be
> human-friendly, and introduce a separate option, say
> "-fparseable-diagnostics" to switch to an easily parseable output format?
clang has had an error and warning count for a really long time now and tools
work with it. gcc 7 added -fdiagnostics-parseable-fixits but fixits are only
part of diagnostics.
>From gcc-bugs-return-596642-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 03:35:49 2018
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Subject: [Bug bootstrap/21547] GMP/MPFR shared libraries not in LD_LIBRARY_PATH: failure to build libgfortran
Date: Thu, 08 Mar 2018 03:35:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=44425
--- Comment #10 from Eric Gallager <egallager at gcc dot gnu.org> ---
Possibly related to bug 44425
>From gcc-bugs-return-596643-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 03:49:38 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug driver/84749] -w does not work with option property Warn
Date: Thu, 08 Mar 2018 03:49:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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Last reconfirmed| |2018-03-08
CC| |msebor at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
I recently noticed this too. For instance, here -w suppresses -Wreturn-type
but doesn't suppress the warning about -Wmudflap being no longer supported:
$ grep -B1 "Warn(" /src/gcc/svn/gcc/c-family/c.opt | head -n2
Wmudflap
C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
$ echo "f() { }" | gcc -S -Wall -Wextra -Wmudflap -Wreturn-type -w -xc -
xgcc: warning: switch ‘-Wmudflap’ is no longer supported
>From gcc-bugs-return-596644-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 04:01:01 2018
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Subject: [Bug other/44035] internals documentation cannot be fixed without new GFDL license grants
Date: Thu, 08 Mar 2018 04:01:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=44032
--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
Does this really need to have "blocker" importance? It has gone several years
without actually blocking any releases.
>From gcc-bugs-return-596645-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 04:21:21 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug inline-asm/84742] internal compiler error: in process_alt_operands, at lra-constraints.c:2112
Date: Thu, 08 Mar 2018 04:21:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-08
CC| |msebor at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
I have reproduced it (intermittently) with revisions as recent as r258160, but
only with ASLR enabled. The valgrind errors for sparseset_bit_p are expected
and go away --with-enable-valgrind-annotations. I don't see any other errors
in my report and I can't reproduce it without ASLR or under GDB so there isn't
much to go on.
$ /opt/notnfs/gcc-bisect/obj/gcc/cc1plus.258160 -quiet -O3 -fpermissive
-fno-toplevel-reorder -std=c++14 -o/dev/null t.C
during RTL pass: reload
t.C: In function ‘void a()’:
t.C:10:1: internal compiler error: in process_alt_operands, at
lra-constraints.c:2112
}
^
0x1013ddb process_alt_operands
../../gcc/lra-constraints.c:2112
0x10187ca curr_insn_transform
../../gcc/lra-constraints.c:3860
0x101c13f lra_constraints(bool)
../../gcc/lra-constraints.c:4877
0x1004f6f lra(_IO_FILE*)
../../gcc/lra.c:2419
0xfac579 do_reload
../../gcc/ira.c:5465
0xfaca6c execute
../../gcc/ira.c:5649
>From gcc-bugs-return-596646-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 04:27:25 2018
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Subject: [Bug c++/84698] ICE when using noexcept(noexcept()) declaration on global friend function of template class
Date: Thu, 08 Mar 2018 04:27:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-08
CC| |jason at gcc dot gnu.org,
| |msebor at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed. Bisection points to r209907 (gcc 4.10.0):
r209907 | jason | 2014-04-29 14:04:50 -0400 (Tue, 29 Apr 2014) | 27 lines
DR 1351
Represent the unevaluated exception specification of an implicitly
declared or deleted function with a simple placeholder, not a list
of functions.
Before then GCC errors out with:
pr84698.C: In instantiation of ‘struct X<int, int>’:
pr84698.C:15:14: required from here
pr84698.C:7:14: error: declaration of ‘template<class ... Args> void
swap(X<Args ...>&, X<Args ...>&) noexcept (<uninstantiated>)’ has a different
exception specifier
friend void swap(X<Args...>& a, X<Args...>& b) noexcept(noexcept(a.swap(b)));
^
pr84698.C:11:13: error: from previous declaration ‘template<class ... Args>
void swap(X<Args ...>&, X<Args ...>&) noexcept (noexcept (a.swap(b)))’
inline void swap(X<Args...>& a, X<Args...>& b) noexcept(noexcept(a.swap(b))) {
^
>From gcc-bugs-return-596647-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 04:32:52 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug inline-asm/84680] [6/7/8 Regression] internal compiler error: Max. number of generated reload insns per insn is achieved (90)
Date: Thu, 08 Mar 2018 04:32:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-08
CC| |msebor at gcc dot gnu.org
Known to work| |4.8.4
Summary|internal compiler error: |[6/7/8 Regression] internal
|Max. number of generated |compiler error: Max. number
|reload insns per insn is |of generated reload insns
|achieved (90) |per insn is achieved (90)
Ever confirmed|0 |1
Known to fail| |4.9.3, 5.3.0, 6.1.0, 7.3.0,
| |8.0
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed. Bisection points to:
r201915 (gcc 4.9.0):
r201915 | kyukhin | 2013-08-22 02:06:03 -0400 (Thu, 22 Aug 2013) | 135 lines
* common/config/i386/i386-common.c (OPTION_MASK_ISA_AVX512F_SET): New.
...
Before that, GCC would fail with:
pr84680.C: In function ‘void a()’:
pr84680.C:4:56: error: impossible constraint in ‘asm’
asm volatile("" : "=vp" (b) : "0" (__builtin_alloca));
^
>From gcc-bugs-return-596648-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 04:35:32 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug inline-asm/84679] [6/7/8 Regression] internal compiler error: in lra_eliminate_reg_if_possible, at lra-eliminations.c:1382
Date: Thu, 08 Mar 2018 04:35:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-08
CC| |msebor at gcc dot gnu.org
Known to work| |4.9.4
Summary|internal compiler error: in |[6/7/8 Regression] internal
|lra_eliminate_reg_if_possib |compiler error: in
|le, at |lra_eliminate_reg_if_possib
|lra-eliminations.c:1382 |le, at
| |lra-eliminations.c:1382
Ever confirmed|0 |1
Known to fail| |5.3.0, 6.4.0, 7.3.0, 8.0
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed. Bisection points to r211475 (gcc 4.10.0):
r211475 | rsandifo | 2014-06-11 12:59:17 -0400 (Wed, 11 Jun 2014) | 34 lines
gcc/
* common.md: New file.
* doc/md.texi: Update description of generic, machine-independent
constraints.
* config/s390/constraints.md (e): Delete.
* Makefile.in (md_file): Include common.md.
* config/m32c/t-m32c (md_file): Likewise.
* genpreds.c (general_mem): New array.
(generic_constraint_letters): Remove constraints now defined by
common.md.
(add_constraint): Map TARGET_MEM_CONSTRAINT to general_mem.
Allow the first character to be '<' or '>' as well.
* genoutput.c (general_mem): New array.
(indep_constraints): Remove constraints now defined by common.md.
(note_constraint): Map TARGET_MEM_CONSTRAINT to general_mem.
Remove special handling of 'm'.
* ira-costs.c (record_reg_classes): Remove special handling of
constraints now defined by common.md.
* ira.c (ira_setup_alts, ira_get_dup_out_num): Likewise.
* ira-lives.c (single_reg_class): Likewise.
(ira_implicitly_set_insn_hard_regs): Likewise.
* lra-constraints.c (reg_class_from_constraints): Likewise.
(process_alt_operands, process_address, curr_insn_transform): Likewise.
* postreload.c (reload_cse_simplify_operands): Likewise.
* reload.c (push_secondary_reload, scratch_reload_class)
(find_reloads, alternative_allows_const_pool_ref): Likewise.
* reload1.c (maybe_fix_stack_asms): Likewise.
* targhooks.c (default_secondary_reload): Likewise.
* stmt.c (parse_output_constraint): Likewise.
* recog.c (preprocess_constraints): Likewise.
(constrain_operands, peep2_find_free_register): Likewise.
(asm_operand_ok): Likewise, but add a comment saying why 'o'
must be handled specially.
>From gcc-bugs-return-596649-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 04:39:57 2018
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Subject: [Bug inline-asm/84677] [6/7/8 Regression] internal compiler error: in extract_constrain_insn, at recog.c:2205
Date: Thu, 08 Mar 2018 04:39:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Known to work| |5.4.0
Keywords| |ice-on-valid-code
Last reconfirmed| |2018-03-08
CC| |msebor at gcc dot gnu.org
Ever confirmed|0 |1
Summary|internal compiler error: in |[6/7/8 Regression] internal
|extract_constrain_insn, at |compiler error: in
|recog.c:2205 |extract_constrain_insn, at
| |recog.c:2205
Known to fail| |6.4.0, 7.3.0, 8.0
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed. My bisection also points to r229470 (gcc 6.0.0):
r229470 | law | 2015-10-27 21:05:53 -0400 (Tue, 27 Oct 2015) | 184 lines
[PATCH 7/9] ENABLE_CHECKING refactoring: middle-end, LTO FE
gcc/lto/ChangeLog:
2015-10-27 Mikhail Maltsev <maltsevm@gmail.com>
* lto.c (unify_scc): Use flag_checking and remove ENABLE_CHECKING
conditionals.
(lto_fixup_state): Likewise.
(do_whole_program_analysis): Use
symtab_node::checking_verify_symtab_nodes and remove ENABLE_CHECKING
conditionals.
...
Before that GCC accepted the code so I'm assuming it's ice-on-valid-code.
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Subject: [Bug c++/84582] [8 Regression] Rejected valid C++ code since r257961
Date: Thu, 08 Mar 2018 05:41:00 -0000
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Bug 84582 depends on bug 84596, which changed state.
Bug 84596 Summary: [8 Regression] internal compiler error: unexpected expression '(bool)c' of kind implicit_conv_expr (cxx_eval_constant_expression)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84596
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |ASSIGNED
Resolution|FIXED |---
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Subject: [Bug c++/84596] [8 Regression] internal compiler error: unexpected expression '(bool)c' of kind implicit_conv_expr (cxx_eval_constant_expression)
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Alexandre Oliva <aoliva at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P4 |P3
Status|RESOLVED |ASSIGNED
Resolution|FIXED |---
--- Comment #7 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Vegard, this PR is already resolved, I suggest filing a new PR for the bug you
detected with the testcase in comment 6, and linking back to this one there,
for reference.
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Subject: [Bug driver/83206] -mfpu=auto does not work on ARM (armv7l-unknown-linux-gnueabihf)
Date: Thu, 08 Mar 2018 05:52:00 -0000
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--- Comment #23 from Andrew Roberts <andrewm.roberts at sky dot com> ---
RPI Zero still looks ok with latest snapshot.
/usr/local/gcc/bin/gcc -mfpu=auto -O3 -o matrix matrix.c
cc1: error: -mfloat-abi=hard: selected processor lacks an FPU
/usr/local/gcc/bin/gcc -mcpu=native -mfpu=auto -O3 -o matrix matrix.c
Is ok.
/usr/local/gcc/bin/gcc -march=native -mcpu=native -Q --help=target | grep
"mcpu\|mfpu\|march"
-march= armv6zk+fp
-mcpu= arm1176jzf-s
-mfpu= vfp
/usr/local/gcc/bin/gcc -v
Using built-in specs.
COLLECT_GCC=/usr/local/gcc/bin/gcc
COLLECT_LTO_WRAPPER=/usr/local/gcc-8.0.0/libexec/gcc/armv6l-unknown-linux-gnueabihf/8.0.1/lto-wrapper
Target: armv6l-unknown-linux-gnueabihf
Configured with: ../gcc-8.0.0/configure --prefix=/usr/local/gcc-8.0.0
--program-suffix= --disable-werror --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-gnu-unique-object
--enable-linker-build-id --with-linker-hash-style=gnu --enable-plugin
--enable-gnu-indirect-function --enable-lto --with-isl
--enable-languages=c,c++,fortran,lto --disable-libgcj --enable-clocale=gnu
--disable-libstdcxx-pch --enable-install-libiberty --disable-multilib
--disable-libssp --enable-default-pie --enable-default-ssp
--host=armv6l-unknown-linux-gnueabihf --build=armv6l-unknown-linux-gnueabihf
--with-arch=armv6 --with-float=hard --with-fpu=vfp --disable-bootstrap
Thread model: posix
gcc version 8.0.1 20180304 (experimental) (GCC)
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Subject: [Bug fortran/77296] [F03] Compiler Error with allocatable string and associate
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janus at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |8.0
--- Comment #7 from janus at gcc dot gnu.org ---
(In reply to Matt Thompson from comment #6)
> (In reply to Thomas Koenig from comment #5)
> > This has been fixed by Paul's patch, closing.
> >
> > Thanks for the bug report!
>
> Will this patch appear in GCC 8?
Yes, it has been committed to trunk, so it will be included in the next major
release, which is GCC 8.
> 7.4?
Probably not, since it has not been backported to the 7-branch (which usually
is only done for regressions).
> Is there a way to query which version bugs are fixed in?
That's what the "target milestone" field is for. I just updated that.
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Subject: [Bug fortran/34640] ICE when assigning item of a derived-component to a pointer
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janus at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |8.0
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Subject: [Bug c/84755] GCC 4.6.0 build error with GCC-4.8.5 in Ubuntu 16.04 LTS
Date: Thu, 08 Mar 2018 06:56:00 -0000
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--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
gcc 4.6 and 4.8 branches are old and not supported anymore. Besides, trying
4.6.0 (with unidentified patches!) instead of 4.6.N with the largest possible
N is just asking for trouble (the problem may already be fixed in 4.6.N).
Google also has plenty of hits for your error, some may be relevant.
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Subject: [Bug tree-optimization/84739] [6/7/8 Regression] ICE in get_value_for_expr, at tree-ssa-ccp.c:649
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Mar 8 06:56:59 2018
New Revision: 258351
URL: https://gcc.gnu.org/viewcvs?rev=258351&root=gcc&view=rev
Log:
PR tree-optimization/84739
* tree-tailcall.c (find_tail_calls): Check call arguments against
DECL_ARGUMENTS (current_function_decl) rather than
DECL_ARGUMENTS (func) when checking for tail recursion.
* gcc.dg/pr84739.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr84739.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-tailcall.c
>From gcc-bugs-return-596657-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 06:59:55 2018
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Subject: [Bug tree-optimization/84739] [6/7 Regression] ICE in get_value_for_expr, at tree-ssa-ccp.c:649
Date: Thu, 08 Mar 2018 06:59:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[6/7/8 Regression] ICE in |[6/7 Regression] ICE in
|get_value_for_expr, at |get_value_for_expr, at
|tree-ssa-ccp.c:649 |tree-ssa-ccp.c:649
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed on the trunk so far.
>From gcc-bugs-return-596658-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 07:17:50 2018
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Subject: [Bug target/84751] ICE with debug build of gcc GIMPLE pass: store-merging or IPA pass: cp
Date: Thu, 08 Mar 2018 07:17:00 -0000
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----------------------------------------------------------------------------
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
What configure flags for that specially configured gcc?
Can you in a debugger pt whatever tree_operand_hash::hash is called on?
I certainly can't reproduce this with a cross to powerpc64-linux, even under
valgrind it is clear.
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Subject: [Bug target/84756] New: Multiplication done twice just to get upper and lower parts of product
Date: Thu, 08 Mar 2018 07:22:00 -0000
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Bug ID: 84756
Summary: Multiplication done twice just to get upper and lower
parts of product
Product: gcc
Version: 7.2.0
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Consider the following C code valid for both x86 and amd64 targets:
#ifdef __SIZEOF_INT128__
typedef __uint128_t Longer;
#else
typedef unsigned long long Longer;
#endif
typedef unsigned long Shorter;
Shorter mul(Shorter a, Shorter b, Shorter* upper)
{
*upper=(Longer)a*b >> 8*sizeof(Shorter);
return (Longer)a*b;
}
Longer lmul(Shorter a, Shorter b)
{
return (Longer)a*b;
}
From lmul function I get the expected good assembly:
lmul:
mov eax, DWORD PTR [esp+8]
mul DWORD PTR [esp+4]
ret
But for mul gcc generates two multiplications instead of one:
mul:
push ebx
mov ecx, DWORD PTR [esp+8]
mov ebx, DWORD PTR [esp+12]
mov eax, ecx
mul ebx
mov eax, DWORD PTR [esp+16]
mov DWORD PTR [eax], edx
mov eax, ecx
imul eax, ebx
pop ebx
ret
Here 'mul ebx' is used to get the upper part of the result, and `imul eax, ebx`
is supposed to ge the lower part, although it has already been present right
after `mul ebx` in eax register.
Similar problem happens when I use -m64 option for gcc to get amd64 code.
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Subject: [Bug tree-optimization/84740] [8 Regression] ICE in build_constructors, at tree-switch-conversion.c:965
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Mar 8 07:29:42 2018
New Revision: 258354
URL: https://gcc.gnu.org/viewcvs?rev=258354&root=gcc&view=rev
Log:
PR tree-optimization/84740
* tree-switch-conversion.c (process_switch): Call build_constructors
only if info.phi_count is non-zero.
* gcc.dg/torture/pr84740.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr84740.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-switch-conversion.c
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Subject: [Bug tree-optimization/84740] [8 Regression] ICE in build_constructors, at tree-switch-conversion.c:965
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug target/84757] New: Useless MOVs and PUSHes to store results of MUL
Date: Thu, 08 Mar 2018 07:47:00 -0000
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Bug ID: 84757
Summary: Useless MOVs and PUSHes to store results of MUL
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Consider the following C code:
#ifdef __SIZEOF_INT128__
typedef __uint128_t Longer;
#else
typedef unsigned long long Longer;
#endif
typedef unsigned long Shorter;
Shorter mulSmarter(Shorter a, Shorter b, Shorter* upper)
{
const Longer ab=(Longer)a*b;
*upper=ab >> 8*sizeof(Shorter);
return ab;
}
On amd64 with -m64 option I get identical assembly on both gcc 7.x and 6.3. But
on x86 (or amd64 with -m32) assembly is different, and on gcc 7.x is less
efficient. See to compare:
# gcc 6.3
mulSmarter:
mov eax, DWORD PTR [esp+8]
mul DWORD PTR [esp+4]
mov ecx, edx
mov edx, DWORD PTR [esp+12]
mov DWORD PTR [edx], ecx
ret
# gcc 7.3
mulSmarter:
push esi
push ebx
mov eax, DWORD PTR [esp+16]
mul DWORD PTR [esp+12]
mov esi, edx
mov edx, DWORD PTR [esp+20]
mov ebx, eax
mov eax, ebx
mov DWORD PTR [edx], esi
pop ebx
pop esi
ret
The gcc 6.3 version is already not perfect, but it's much better than that of
7.3.
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Subject: [Bug rtl-optimization/84682] [6/7/8 Regression] internal compiler error: Segmentation fault (process_address_1)
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----------------------------------------------------------------------------
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CC| |aoliva at gcc dot gnu.org
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--- Comment #4 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Mine
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/84408] [8 regression] gcc.dg/plugin/poly-int-07_plugin.c compilation times out with -g
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--- Comment #12 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Author: aoliva
Date: Thu Mar 8 08:27:56 2018
New Revision: 258355
URL: https://gcc.gnu.org/viewcvs?rev=258355&root=gcc&view=rev
Log:
[LVU] reset view at function entry, omit views at line zero
Location views might be associated with locations that lack line
number information (line number zero), but since we omit .loc
directives that would have been issued with line number zero, we also
omit the symbolic view numbers that would have been issued at such
points.
Resetting views at function entry points address some of these issues,
and alleviate the huge chains of symbolic views that have burdened
assemblers since we disabled -ginternal-reset-location-views by
default, but other problems of undefined views remain when it's not
the whole function that lacks line number info, just parts of it.
So, when we encounter a request to output a view that may have been
referenced, but we decide to omit the .loc because the line is zero,
we will now omit the view as well, i.e., we will internally regard
that view as zero-numbered.
for gcc/ChangeLog
PR debug/84404
PR debug/84408
* dwarf2out.c (struct dw_line_info_table): Update comments for
view == -1.
(FORCE_RESET_NEXT_VIEW): New.
(FORCE_RESETTING_VIEW_P): New.
(RESETTING_VIEW_P): Check for -1 too.
(ZERO_VIEW_P): Likewise.
(new_line_info_table): Force-reset next view.
(dwarf2out_begin_function): Likewise.
(dwarf2out_source_line): Simplify zero_view_p initialization.
Test FORCE_RESETTING_VIEW_P and RESETTING_VIEW_P instead of
view directly. Omit view when omitting .loc at line 0.
for gcc/testsuite/ChangeLog
PR debug/84404
PR debug/84408
* gcc.dg/graphite/pr84404.c: New.
Added:
trunk/gcc/testsuite/gcc.dg/graphite/pr84404.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dwarf2out.c
trunk/gcc/testsuite/ChangeLog
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/84404] Several "leb128 operand is an undefined symbol" in go testsuite with latest debug improvements
Date: Thu, 08 Mar 2018 08:28:00 -0000
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--- Comment #8 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Author: aoliva
Date: Thu Mar 8 08:27:56 2018
New Revision: 258355
URL: https://gcc.gnu.org/viewcvs?rev=258355&root=gcc&view=rev
Log:
[LVU] reset view at function entry, omit views at line zero
Location views might be associated with locations that lack line
number information (line number zero), but since we omit .loc
directives that would have been issued with line number zero, we also
omit the symbolic view numbers that would have been issued at such
points.
Resetting views at function entry points address some of these issues,
and alleviate the huge chains of symbolic views that have burdened
assemblers since we disabled -ginternal-reset-location-views by
default, but other problems of undefined views remain when it's not
the whole function that lacks line number info, just parts of it.
So, when we encounter a request to output a view that may have been
referenced, but we decide to omit the .loc because the line is zero,
we will now omit the view as well, i.e., we will internally regard
that view as zero-numbered.
for gcc/ChangeLog
PR debug/84404
PR debug/84408
* dwarf2out.c (struct dw_line_info_table): Update comments for
view == -1.
(FORCE_RESET_NEXT_VIEW): New.
(FORCE_RESETTING_VIEW_P): New.
(RESETTING_VIEW_P): Check for -1 too.
(ZERO_VIEW_P): Likewise.
(new_line_info_table): Force-reset next view.
(dwarf2out_begin_function): Likewise.
(dwarf2out_source_line): Simplify zero_view_p initialization.
Test FORCE_RESETTING_VIEW_P and RESETTING_VIEW_P instead of
view directly. Omit view when omitting .loc at line 0.
for gcc/testsuite/ChangeLog
PR debug/84404
PR debug/84408
* gcc.dg/graphite/pr84404.c: New.
Added:
trunk/gcc/testsuite/gcc.dg/graphite/pr84404.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dwarf2out.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/80452] [DR 1579] incorrect value category deduced for return value
Date: Thu, 08 Mar 2018 08:35:00 -0000
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--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 43593
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43593&action=edit
Reduced test-case from chromium
Well, I've got following reduced test-case. It comes from chromium project and
my question is how can user easily modify source code to make older GCC
releases happy :) ?
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Subject: [Bug rtl-optimization/84682] [6/7/8 Regression] internal compiler error: Segmentation fault (process_address_1)
Date: Thu, 08 Mar 2018 08:36:00 -0000
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--- Comment #5 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Created attachment 43594
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43594&action=edit
candidate patch
Here's what I'm testing
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/84732] false-positive -Wstringop-truncation warning with -fsanitize-coverage=trace-pc
Date: Thu, 08 Mar 2018 08:38:00 -0000
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--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
> So, the -Wstringop-truncation would need to do the suggested alias search
> for the store rather than next statement it does now, and in addition to
> that would need to ignore ASAN_CHECK, because those are guaranteed not to
> actually read the passed memory, just to check corresponding shadow memory.
Which is probably similar to what was seen in PR84307, am I right?
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Subject: [Bug lto/81004] [7 Regression] linking failed with -flto and static libboost_program_options
Date: Thu, 08 Mar 2018 08:39:00 -0000
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Christophe Lyon <clyon at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |clyon at gcc dot gnu.org
--- Comment #30 from Christophe Lyon <clyon at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #29)
> Should be fixed on all active branches.
Actually the backport to gcc-6-branch introduced a regression. On arm, I'm
seeing:
lto1: fatal error: missing resolution data for _ZTV4base
compilation terminated.
lto-wrapper: fatal error:
/aci-gcc-fsf/builds/gcc-fsf-gccsrc/obj-arm-none-linux-gnueabihf/gcc3/gcc/testsuite/g++2/../../xg++
returned 1 exit status
compilation terminated.
/aci-gcc-fsf/builds/gcc-fsf-gccsrc/tools/arm-none-linux-gnueabihf/bin/ld:
error: lto-wrapper failed
collect2: error: ld returned 1 exit status
compiler exited with status 1
FAIL: g++.dg/lto/20081125 cp_lto_20081125_0.o-cp_lto_20081125_1.o link, -flto
-flto-partition=1to1
UNRESOLVED: g++.dg/lto/20081125 cp_lto_20081125_0.o-cp_lto_20081125_1.o execute
-flto -flto-partition=1to1
Similar regressions on:
g++.dg/lto/20081125 cp_lto_20081125_0.o-cp_lto_20081125_1.o link, -flto
-flto-partition=1to1
g++.dg/lto/20090311 cp_lto_20090311_0.o-cp_lto_20090311_1.o link, -O0 -flto
-flto-partition=none -fuse-linker-plugin
g++.dg/lto/20090311 cp_lto_20090311_0.o-cp_lto_20090311_1.o link, -O0 -flto
-fuse-linker-plugin -fno-fat-lto-objects
g++.dg/lto/20091210-1 cp_lto_20091210-1_0.o-cp_lto_20091210-1_1.o link, -O0
-flto -flto-partition=none -fuse-linker-plugin
g++.dg/lto/20091210-1 cp_lto_20091210-1_0.o-cp_lto_20091210-1_1.o link, -O0
-flto -fuse-linker-plugin -fno-fat-lto-objects
g++.dg/torture/pr67600.C -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects (test for excess errors)
On aarch64, one of the testcases now produces an ICE:
/aci-gcc-fsf/builds/gcc-fsf-gccsrc/obj-aarch64-none-elf/gcc3/gcc/testsuite/g++3/../../xg++
-B/aci-gcc-fsf/builds/gcc-fsf-gccsrc/obj-aarch64-none-elf/gcc3/gcc/testsuite/g++3/../../
cp_lto_20091210-1_0.o cp_lto_20091210-1_1.o g++_tg.o
-fno-diagnostics-show-caret -fdiagnostics-color=never -nostdinc++
-I/aci-gcc-fsf/builds/gcc-fsf-gccsrc/obj-aarch64-none-elf/gcc3/aarch64-none-elf/libstdc++-v3/include/aarch64-none-elf
-I/aci-gcc-fsf/builds/gcc-fsf-gccsrc/obj-aarch64-none-elf/gcc3/aarch64-none-elf/libstdc++-v3/include
-I/libstdc++-v3/libsupc++ -I/libstdc++-v3/include/backward
-I/libstdc++-v3/testsuite/util -fmessage-length=0 -O0 -flto
-flto-partition=none -fuse-linker-plugin -specs=aem-ve.specs
-L/aci-gcc-fsf/builds/gcc-fsf-gccsrc/obj-aarch64-none-elf/gcc3/aarch64-none-elf/./libstdc++-v3/src/.libs
-B/aci-gcc-fsf/builds/gcc-fsf-gccsrc/obj-aarch64-none-elf/gcc3/aarch64-none-elf/./libstdc++-v3/src/.libs
-Wl,-wrap,exit -Wl,-wrap,_exit -Wl,-wrap,main -Wl,-wrap,abort -o
g++-dg-lto-20091210-1-01.exe
lto1: internal compiler error: in register_resolution, at lto/lto.c:840
0x5dd465 register_resolution
/gcc/lto/lto.c:840
0x5ddf57 lto_read_decls
/gcc/lto/lto.c:1792
0x5dff11 lto_file_finalize
/gcc/lto/lto.c:2064
0x5dff11 lto_create_files_from_ids
/gcc/lto/lto.c:2074
0x5dff11 lto_file_read
/gcc/lto/lto.c:2115
0x5dff11 read_cgraph_and_symbols
/gcc/lto/lto.c:2825
0x5dff11 lto_main()
/gcc/lto/lto.c:3337
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: fatal error:
/aci-gcc-fsf/builds/gcc-fsf-gccsrc/obj-aarch64-none-elf/gcc3/gcc/testsuite/g++3/../../xg++
returned 1 exit status
compilation terminated.
/aci-gcc-fsf/builds/gcc-fsf-gccsrc/tools/aarch64-none-elf/bin/ld: error:
lto-wrapper failed
collect2: error: ld returned 1 exit status
compiler exited with status 1
FAIL: g++.dg/lto/20091210-1 cp_lto_20091210-1_0.o-cp_lto_20091210-1_1.o link,
-O0 -flto -flto-partition=none -fuse-linker-plugin (internal compiler error)
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/84732] false-positive -Wstringop-truncation warning with -fsanitize-coverage=trace-pc
Date: Thu, 08 Mar 2018 08:39:00 -0000
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--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #4)
> (In reply to Martin Liška from comment #2)
> > I guess it somehow confuses VRP, Martin can you please take a look? Note
> > that __builtin___sanitizer_cov_trace_pc is pure function, can't modify
> > memory in original program.
>
> No, __builtin___sanitizer_cov_trace_pc is certainly not pure and can't
> really be, otherwise would optimize them all away (nothing uses their void
> return value),
> so the problem is that it invalidates all recorded string lengths, at least
> those that escape (but in this testcase it is a global variable).
> As __sanitizer_cov_trace_pc is a user-supplied function, I don't really
> think we can assume anything on it (e.g. that it will not change any global
> or escaped local variables, it can change them and most likely will do at
> least some of them, otherwise it would be useless).
I see, I was probably too eager :)
>From gcc-bugs-return-596671-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 08:47:30 2018
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Subject: [Bug tree-optimization/84737] [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888
Date: Thu, 08 Mar 2018 08:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84737
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Thank you, may I please ask you for the IPA CP dump file for not affected
revision (r256887). Do I understand the numbers right that version with
.resid_.constprop.1 is slower?
>From gcc-bugs-return-596672-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 08:49:18 2018
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Subject: [Bug target/84751] ICE with debug build of gcc GIMPLE pass: store-merging or IPA pass: cp
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |powerpc64-linux
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-03-08
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>From gcc-bugs-return-596673-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 08:51:32 2018
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Subject: [Bug target/84756] Multiplication done twice just to get upper and lower parts of product
Date: Thu, 08 Mar 2018 08:51:00 -0000
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--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
We immediately narrow "return (Longer)a*b;" to "return a*b;" which makes it
hard to CSE later.
If you can, it would be better to write the code as:
Longer mul = (Longer)a*b;
... use mul twice ...
Not sure what the best place would be for this optimization. Somewhere in RTL
when we don't care about signed/unsigned? Earlier in value numbering, checking
for each mult if a widening version is already available? Other, say like we
check if cos and sin are called on the same argument?
>From gcc-bugs-return-596674-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 08:52:25 2018
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Subject: [Bug c/84755] GCC 4.6.0 build error with GCC-4.8.5 in Ubuntu 16.04 LTS
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
As said, both compilers in question are no longer supported.
>From gcc-bugs-return-596675-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 08:53:15 2018
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Subject: [Bug gcov-profile/82457] libgcov fork and exec hooks not always used
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--- Comment #12 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Thu Mar 8 08:52:39 2018
New Revision: 258356
URL: https://gcc.gnu.org/viewcvs?rev=258356&root=gcc&view=rev
Log:
Backport r254137
2018-03-08 Martin Liska <mliska@suse.cz>
Backport from mainline
2017-10-27 Martin Liska <mliska@suse.cz>
PR gcov-profile/82457
* doc/invoke.texi: Document that one needs a non-strict ISO mode
for fork-like functions to be properly instrumented.
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/doc/invoke.texi
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Subject: [Bug target/84757] [7/8 Regression] Useless MOVs and PUSHes to store results of MUL
Date: Thu, 08 Mar 2018 08:55:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |i?86-*-*
Priority|P3 |P2
Status|UNCONFIRMED |NEW
Keywords| |missed-optimization
Last reconfirmed| |2018-03-08
Ever confirmed|0 |1
Summary|Useless MOVs and PUSHes to |[7/8 Regression] Useless
|store results of MUL |MOVs and PUSHes to store
| |results of MUL
Target Milestone|--- |7.4
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-596678-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 08:56:56 2018
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Subject: [Bug other/82352] [7 Regression] comdat-local function called by void h::i() outside its comdat
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--- Comment #11 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Thu Mar 8 08:56:20 2018
New Revision: 258358
URL: https://gcc.gnu.org/viewcvs?rev=258358&root=gcc&view=rev
Log:
Backport r256226
2018-03-08 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-01-04 Martin Liska <mliska@suse.cz>
PR ipa/82352
* ipa-icf.c (sem_function::merge): Do not cross comdat boundary.
2018-03-08 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-01-04 Martin Liska <mliska@suse.cz>
PR ipa/82352
* g++.dg/ipa/pr82352.C: New test.
Added:
branches/gcc-6-branch/gcc/testsuite/g++.dg/ipa/pr82352.C
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/ipa-icf.c
branches/gcc-6-branch/gcc/testsuite/ChangeLog
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Subject: [Bug gcov-profile/82633] Document GCOV and function removal (-fkeep-inline-functions, -fkeep-static-functions)
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--- Comment #13 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Thu Mar 8 08:55:59 2018
New Revision: 258357
URL: https://gcc.gnu.org/viewcvs?rev=258357&root=gcc&view=rev
Log:
Backport r254257
2018-03-08 Martin Liska <mliska@suse.cz>
Backport from mainline
2017-10-31 Martin Liska <mliska@suse.cz>
PR gcov-profile/82633
* doc/gcov.texi: Document -fkeep-{static,inline}-functions and
their interaction with GCOV infrastructure.
* configure.ac: Add -fkeep-{inline,static}-functions to
coverage_flags.
* configure: Regenerate.
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/configure
branches/gcc-6-branch/gcc/configure.ac
branches/gcc-6-branch/gcc/doc/gcov.texi
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Subject: [Bug debug/77844] [5 Regression] Compilation of simple C++ example exhaust memory
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77844
--- Comment #13 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Thu Mar 8 08:56:45 2018
New Revision: 258359
URL: https://gcc.gnu.org/viewcvs?rev=258359&root=gcc&view=rev
Log:
Backport r243662
2018-03-08 Martin Liska <mliska@suse.cz>
Backport from mainline
2016-12-14 Jakub Jelinek <jakub@redhat.com>
PR debug/77844
* valtrack.c: Include rtl-iter.h.
(struct rtx_subst_pair): Add insn field.
(propagate_for_debug_subst): If pair->to contains at least 2
regs, create a DEBUG_INSN with a debug temp before pair->insn
and replace from with the debug temp instead of pair->to.
(propagate_for_debug): Initialize p.insn.
* combine.c (insn_uid_check): New inline function.
(INSN_COST, LOG_LINKS): Use it instead of INSN_UID.
(find_single_use, combine_instructions,
cant_combine_insn_p, try_combine): Use NONDEBUG_INSN_P instead of
INSN_P.
2018-03-08 Martin Liska <mliska@suse.cz>
Backport from mainline
2016-12-14 Jakub Jelinek <jakub@redhat.com>
PR debug/77844
* g++.dg/opt/pr77844.C: New test.
Added:
branches/gcc-6-branch/gcc/testsuite/g++.dg/opt/pr77844.C
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/combine.c
branches/gcc-6-branch/gcc/testsuite/ChangeLog
branches/gcc-6-branch/gcc/valtrack.c
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Subject: [Bug gcov-profile/82457] libgcov fork and exec hooks not always used
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #13 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed on all active branches.
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Subject: [Bug gcov-profile/82633] Document GCOV and function removal (-fkeep-inline-functions, -fkeep-static-functions)
Date: Thu, 08 Mar 2018 08:57:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #14 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed on all active branches.
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Subject: [Bug ipa/82107] [6 Regression] O2 optimisation on amd64 leads to error
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed on GCC-6 branch.
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Subject: [Bug c++/84569] [6 Regression] g++ -g -O3 consumes all memory
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed on GCC-6 branch.
>From gcc-bugs-return-596684-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 09:06:23 2018
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Subject: [Bug gcov-profile/84735] [8 Regression] Describe recent gcov data file format changes in gcov-io.h
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Thu Mar 8 09:05:26 2018
New Revision: 258360
URL: https://gcc.gnu.org/viewcvs?rev=258360&root=gcc&view=rev
Log:
Document gcov-io (PR gcov-profile/84735).
2018-03-08 Martin Liska <mliska@suse.cz>
PR gcov-profile/84735
* doc/gcov.texi: Document usage of profile files.
* gcov-io.h: Document changes in the format.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/doc/gcov.texi
trunk/gcc/gcov-io.h
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Subject: [Bug gcov-profile/84735] [8 Regression] Describe recent gcov data file format changes in gcov-io.h
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug debug/84404] Several "leb128 operand is an undefined symbol" in go testsuite with latest debug improvements
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Alexandre Oliva <aoliva at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
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--- Comment #9 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Fixed
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Subject: [Bug tree-optimization/84746] [8 Regression] ICE on valid code at -O2 and -O3: Segmentation fault
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P1 |P2
Known to work| |8.0
Target Milestone|8.0 |7.4
Summary|[8 Regression] ICE on valid |[7 Regression] ICE on valid
|code at -O2 and -O3: |code at -O2 and -O3:
|Segmentation fault |Segmentation fault
Priority|P2 |P1
Known to work|8.0 |
Target Milestone|7.4 |8.0
Summary|[7 Regression] ICE on valid |[8 Regression] ICE on valid
|code at -O2 and -O3: |code at -O2 and -O3:
|Segmentation fault |Segmentation fault
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk, I'm eventually going to backport a variant of this.
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Mar 8 09:23:44 2018
New Revision: 258361
URL: https://gcc.gnu.org/viewcvs?rev=258361&root=gcc&view=rev
Log:
2018-03-08 Richard Biener <rguenther@suse.de>
PR tree-optimization/84746
* tree-ssa-pre.c (find_leader_in_sets): Deal with SET1 being NULL.
(phi_translate): Pass in destination ANTIC_OUT set.
(phi_translate_1): Likewise. For a simplified result lookup
a leader in ANTIC_OUT and AVAIL_OUT, not the ANTIC_IN sets.
(phi_translate_set): Adjust.
(do_pre_regular_insertion): Likewise.
(do_pre_partial_partial_insertion): Likewise.
* gcc.dg/torture/pr84746.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr84746.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-pre.c
>From gcc-bugs-return-596687-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 09:26:29 2018
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Subject: [Bug tree-optimization/84746] [8 Regression] ICE on valid code at -O2 and -O3: Segmentation fault
Date: Thu, 08 Mar 2018 09:26:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P1 |P2
Known to work| |8.0
Target Milestone|8.0 |7.4
Summary|[8 Regression] ICE on valid |[7 Regression] ICE on valid
|code at -O2 and -O3: |code at -O2 and -O3:
|Segmentation fault |Segmentation fault
Priority|P2 |P1
Known to work|8.0 |
Target Milestone|7.4 |8.0
Summary|[7 Regression] ICE on valid |[8 Regression] ICE on valid
|code at -O2 and -O3: |code at -O2 and -O3:
|Segmentation fault |Segmentation fault
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk, I'm eventually going to backport a variant of this.
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Mar 8 09:23:44 2018
New Revision: 258361
URL: https://gcc.gnu.org/viewcvs?rev=258361&root=gcc&view=rev
Log:
2018-03-08 Richard Biener <rguenther@suse.de>
PR tree-optimization/84746
* tree-ssa-pre.c (find_leader_in_sets): Deal with SET1 being NULL.
(phi_translate): Pass in destination ANTIC_OUT set.
(phi_translate_1): Likewise. For a simplified result lookup
a leader in ANTIC_OUT and AVAIL_OUT, not the ANTIC_IN sets.
(phi_translate_set): Adjust.
(do_pre_regular_insertion): Likewise.
(do_pre_partial_partial_insertion): Likewise.
* gcc.dg/torture/pr84746.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr84746.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-pre.c
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Subject: [Bug lto/81004] [7 Regression] linking failed with -flto and static libboost_program_options
Date: Thu, 08 Mar 2018 09:35:00 -0000
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--- Comment #31 from Jan Hubicka <hubicka at ucw dot cz> ---
I will take a look.
Honza
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Subject: [Bug c++/84724] [7/8 Regression] internal compiler error: in single_succ_edge, at basic-block.h:339 with a declaration of __builtin_trap
Date: Thu, 08 Mar 2018 09:42:00 -0000
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43595
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43595&action=edit
gcc8-pr84724.patch
Untested fix.
>From gcc-bugs-return-596691-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 09:49:17 2018
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Subject: [Bug lto/81004] [7 Regression] linking failed with -flto and static libboost_program_options
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |---
--- Comment #32 from Martin Liška <marxin at gcc dot gnu.org> ---
Reopened.
>From gcc-bugs-return-596692-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 09:54:16 2018
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Subject: [Bug lto/81004] [7 Regression] linking failed with -flto and static libboost_program_options
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--- Comment #33 from Martin Liška <marxin at gcc dot gnu.org> ---
Can't reproduce the ICE on aarch64. There's my resolution file:
cat -- -lm.res
2
20091210-1_0.o 20
213 a66530621f3cf044 PREVAILING_DEF_IRONLY _ZN5Base1D2Ev
206 a66530621f3cf044 PREVAILING_DEF_IRONLY _ZTV5Base1
216 a66530621f3cf044 PREVAILING_DEF_IRONLY _ZN5Base1D1Ev
261 a66530621f3cf044 PREVAILING_DEF_IRONLY _ZN4Base1fEv
265 a66530621f3cf044 PREVAILING_DEF_IRONLY _ZThn8_N4Base1fEv
268 a66530621f3cf044 PREVAILING_DEF_IRONLY _ZN4BaseD2Ev
246 a66530621f3cf044 PREVAILING_DEF_IRONLY _ZTV4Base
270 a66530621f3cf044 PREVAILING_DEF_IRONLY _ZN4BaseD1Ev
273 a66530621f3cf044 PREVAILING_DEF_IRONLY _ZN4BaseD0Ev
275 a66530621f3cf044 PREVAILING_DEF_IRONLY _ZN5Base1D0Ev
299 a66530621f3cf044 PREVAILING_DEF_IRONLY _ZTS5Base1
312 a66530621f3cf044 PREVAILING_DEF_IRONLY _ZTI5Base1
326 a66530621f3cf044 PREVAILING_DEF_IRONLY _ZTS5Base2
328 a66530621f3cf044 PREVAILING_DEF_IRONLY _ZTI5Base2
336 a66530621f3cf044 PREVAILING_DEF_IRONLY _ZTS4Base
362 a66530621f3cf044 PREVAILING_DEF_IRONLY _ZTI4Base
181 a66530621f3cf044 RESOLVED_DYN __gxx_personality_v0
323 a66530621f3cf044 RESOLVED_DYN _ZTVN10__cxxabiv117__class_type_infoE
368 a66530621f3cf044 RESOLVED_DYN _ZTVN10__cxxabiv121__vmi_class_type_infoE
284 a66530621f3cf044 RESOLVED_DYN _ZdlPvm
20091210-1_1.o 25
213 e10871a982460b97 PREEMPTED_IR _ZN5Base1D2Ev
206 e10871a982460b97 PREEMPTED_IR _ZTV5Base1
216 e10871a982460b97 PREEMPTED_IR _ZN5Base1D1Ev
279 e10871a982460b97 PREVAILING_DEF_IRONLY _ZN3Foo1gEv
282 e10871a982460b97 PREEMPTED_IR _ZN5Base1D0Ev
285 e10871a982460b97 PREVAILING_DEF main
291 e10871a982460b97 PREEMPTED_IR _ZN4BaseD2Ev
293 e10871a982460b97 PREEMPTED_IR _ZN4BaseD1Ev
296 e10871a982460b97 PREVAILING_DEF_IRONLY _ZN3FooD2Ev
264 e10871a982460b97 PREVAILING_DEF_IRONLY _ZTV3Foo
298 e10871a982460b97 PREVAILING_DEF_IRONLY _ZN3FooD1Ev
300 e10871a982460b97 PREVAILING_DEF_IRONLY _ZN3FooD0Ev
302 e10871a982460b97 PREEMPTED_IR _ZN4BaseD0Ev
332 e10871a982460b97 PREEMPTED_IR _ZTS5Base1
345 e10871a982460b97 PREEMPTED_IR _ZTI5Base1
364 e10871a982460b97 PREVAILING_DEF_IRONLY _ZTS3Foo
380 e10871a982460b97 PREVAILING_DEF_IRONLY _ZTI3Foo
181 e10871a982460b97 RESOLVED_DYN __gxx_personality_v0
253 e10871a982460b97 RESOLVED_IR _ZTV4Base
356 e10871a982460b97 RESOLVED_DYN _ZTVN10__cxxabiv117__class_type_infoE
386 e10871a982460b97 RESOLVED_DYN _ZTVN10__cxxabiv120__si_class_type_infoE
404 e10871a982460b97 RESOLVED_IR _ZTI4Base
306 e10871a982460b97 RESOLVED_IR _ZN4Base1fEv
308 e10871a982460b97 RESOLVED_IR _ZThn8_N4Base1fEv
317 e10871a982460b97 RESOLVED_DYN _ZdlPvm
Can you please Christophe attach yours and take a look why the ICE is
triggered?
Thanks.
>From gcc-bugs-return-596693-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 10:13:08 2018
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Subject: [Bug c++/84076] [6/7/8 Regression] Warning about objects through POD mistakenly claims the object is a pointer
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43596
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gcc8-pr84076.patch
Untested fix.
>From gcc-bugs-return-596694-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 10:15:59 2018
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Subject: [Bug target/70359] [6/7/8 Regression] Code size increase for ARM compared to gcc-5.3.0
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Aldy Hernandez <aldyh at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |aldyh at gcc dot gnu.org
--- Comment #30 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Created attachment 43597
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43597&action=edit
untested patch implementing suggestion in comment 26
The attached untested patch attempts to implement the suggestion in comment 26
of replacing the out-of-loop pre-inc with post-inc values.
Richi, is this more or less what you had in mind?
Assuming this:
LOOP:
# p_8 = PHI <p_16(2), p_19(3)>
...
p_19 = p_8 + 4294967295;
goto LOOP:
The patch replaces:
p_22 = p_8 + 4294967294;
MEM[(char *)p_19 + 4294967295B] = 45;
into:
p_22 = p_19 + 4294967295;
*p_22 = 45;
This allows the backend to use auto-dec in two places:
strb r1, [r4, #-1]!
...
strblt r3, [r4, #-1]!
...reducing the byte count from 116 to 104, but just shy of the 96 needed to
eliminate the regression. I will discuss the missing bytes in a follow-up
comment, as they are unrelated to this IV adjustment patch.
It is worth noting that x86 also benefits from a reduction of 3 bytes with this
patch, as we remove 2 lea instructions: one within the loop, and one before
returning. Thus, I believe this is a regression across the board, or at least
in multiple architectures.
A few comments...
While I see the benefit of hijacking insert_backedge_copies() for this, I am
not a big fan of changing the IL after the last tree dump (*t.optimized), as
the modified IL would only be visible in *r.expand. Could we perhaps move this
to another spot? Say after the last forwprop pass, or perhaps right before
expand? Or perhaps have a *t.final dump right before expand?
As mentioned, this is only a proof of concept. I made the test rather
restrictive. I suppose we could relax the conditions and generalize it a bit.
There are comments throughout showing what I had in mind.
>From gcc-bugs-return-596695-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 10:18:59 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug gcov-profile/84758] New: Wrong coverage for quite simple CFG
Date: Thu, 08 Mar 2018 10:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84758
Bug ID: 84758
Summary: Wrong coverage for quite simple CFG
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: gcov-profile
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: marxin at gcc dot gnu.org
Target Milestone: ---
Following isolated test-case is wrong:
$ cat gcovbug2.c
int x, y;
static void
foo (int a, int b)
{
{
if (a == 1 || a == 2)
{
x = 4;
if (b == 3)
x = 6;
}
else
x = 15;
}
}
int
main (void)
{
foo (2, 3);
return 0;
}
$ gcc --coverage gcovbug2.c && ./a.out && gcov gcovbug2.c && cat
gcovbug2.c.gcov
File 'gcovbug2.c'
Lines executed:90.00% of 10
Creating 'gcovbug2.c.gcov'
-: 0:Source:gcovbug2.c
-: 0:Graph:gcovbug2.gcno
-: 0:Data:gcovbug2.gcda
-: 0:Runs:1
-: 0:Programs:1
-: 1:int x, y;
-: 2:
-: 3:static void
1: 4:foo (int a, int b)
-: 5:{
-: 6: {
1: 7: if (a == 1 || a == 2)
-: 8: {
1: 9: x = 4;
2: 10: if (b == 3) <---- this line is wrong
1: 11: x = 6;
-: 12: }
-: 13: else
#####: 14: x = 15;
-: 15: }
1: 16:}
-: 17:
-: 18:int
1: 19:main (void)
-: 20:{
1: 21: foo (2, 3);
1: 22: return 0;
-: 23:}
>From gcc-bugs-return-596696-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 10:21:49 2018
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Subject: [Bug gcov-profile/84758] Wrong coverage for quite simple CFG
Date: Thu, 08 Mar 2018 10:21:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |8.0
>From gcc-bugs-return-596697-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 10:32:29 2018
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/70359] [6/7/8 Regression] Code size increase for x86/ARM/others compared to gcc-5.3.0
Date: Thu, 08 Mar 2018 10:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70359
--- Comment #31 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 8 Mar 2018, aldyh at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70359
>
> Aldy Hernandez <aldyh at gcc dot gnu.org> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> Assignee|unassigned at gcc dot gnu.org |aldyh at gcc dot gnu.org
>
> --- Comment #30 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
> Created attachment 43597
> --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43597&action=edit
> untested patch implementing suggestion in comment 26
>
> The attached untested patch attempts to implement the suggestion in comment 26
> of replacing the out-of-loop pre-inc with post-inc values.
>
> Richi, is this more or less what you had in mind?
Yes.
> Assuming this:
>
> LOOP:
> # p_8 = PHI <p_16(2), p_19(3)>
> ...
> p_19 = p_8 + 4294967295;
> goto LOOP:
>
> The patch replaces:
> p_22 = p_8 + 4294967294;
> MEM[(char *)p_19 + 4294967295B] = 45;
> into:
> p_22 = p_19 + 4294967295;
> *p_22 = 45;
>
> This allows the backend to use auto-dec in two places:
>
> strb r1, [r4, #-1]!
> ...
> strblt r3, [r4, #-1]!
>
> ...reducing the byte count from 116 to 104, but just shy of the 96 needed to
> eliminate the regression. I will discuss the missing bytes in a follow-up
> comment, as they are unrelated to this IV adjustment patch.
>
> It is worth noting that x86 also benefits from a reduction of 3 bytes with this
> patch, as we remove 2 lea instructions: one within the loop, and one before
> returning. Thus, I believe this is a regression across the board, or at least
> in multiple architectures.
>
> A few comments...
>
> While I see the benefit of hijacking insert_backedge_copies() for this, I am
> not a big fan of changing the IL after the last tree dump (*t.optimized), as
> the modified IL would only be visible in *r.expand. Could we perhaps move this
> to another spot? Say after the last forwprop pass, or perhaps right before
> expand? Or perhaps have a *t.final dump right before expand?
I don't see a big problem here - but yes, for example doing it
during uncprop would be possible as well (moving all of
insert_backedge_copies then). I'd not do this at this point though.
> As mentioned, this is only a proof of concept. I made the test rather
> restrictive. I suppose we could relax the conditions and generalize it a bit.
> There are comments throughout showing what I had in mind.
I'd have not restricted the out-of-loop IV use to IV +- CST but
instead did the transform
+ LOOP:
+ # p_8 = PHI <p_16(2), p_INC(3)>
+ ...
+ p_INC = p_8 - 1;
+ goto LOOP;
+ ... p_8 uses ...
to
+ LOOP:
+ # p_8 = PHI <p_16(2), p_INC(3)>
+ ...
+ p_INC = p_8 - 1;
+ goto LOOP;
newtem_12 = p_INC + 1; // undo IV increment
... p_8 out-of-loop p_8 uses replaced with newtem_12 ...
so it would always work if we can undo the IV increment.
The disadvantage might be that we then rely on RTL optimizations
to combine the original out-of-loop constant add with the
newtem computation but I guess that's not too much to ask ;)
k
>From gcc-bugs-return-596698-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 10:34:15 2018
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Subject: [Bug target/70359] [6/7/8 Regression] Code size increase for x86/ARM/others compared to gcc-5.3.0
Date: Thu, 08 Mar 2018 10:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70359
--- Comment #32 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
As mentioned in the previous comment, the proposed patch brings down the count
from 116 to 108 on ARM, but is shy of the desired 96.
The missing bytes can be attributed to forwprop folding this (IL expanded for
illustration):
if (ui_7 / 10 != 0)
into:
if (ui_7 > 9)
More specifically, changing this:
# ui_7 = PHI <ui_13(2), ui_21(3)>
...
ui_21 = ui_7 / 10;
if (ui_21 != 0)
into:
# ui_7 = PHI <ui_13(2), ui_21(3)>
...
ui_21 = ui_7 / 10;
if (ui_7 > 9)
Inhibiting this optimization brings down the byte count to 92 which is even
lower than our 96 boogie man, so perhaps worth pursuing. (Assumes my proposed
patch is also applied.) I'm no expert, but isn't a EQ/NE with 0 preferable
than a <> with a non-zero?
If so, should we restrict the folding somewhat, or clean this up after the
fact?
For reference, the folding (in forwprop) is due to this match.pd pattern:
/* X / C1 op C2 into a simple range test. */
...though eliminating it causes another pattern to pick up the slack and do the
same:
/* Transform:
* (X / Y) == 0 -> X < Y if X, Y are unsigned.
* (X / Y) != 0 -> X >= Y, if X, Y are unsigned.
*/
Eliminating both patterns "fixes" the problem.
Suggestions welcome :).
>From gcc-bugs-return-596699-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 10:37:51 2018
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Subject: [Bug target/70359] [6/7/8 Regression] Code size increase for x86/ARM/others compared to gcc-5.3.0
Date: Thu, 08 Mar 2018 10:37:00 -0000
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--- Comment #33 from Segher Boessenkool <segher at gcc dot gnu.org> ---
The "> 9" transform reduces path length. But foe -Os that is often not a
good idea.
>From gcc-bugs-return-596700-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 10:46:23 2018
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/84456] [8 regression] gcc.dg/guality/pr49888.c fail
Date: Thu, 08 Mar 2018 10:46:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-08
CC| |jakub at gcc dot gnu.org
Component|testsuite |debug
Ever confirmed|0 |1
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
In gcc 7 as well as with -gvariable-location-views in trunk, the 6 problematic
tests are UNSUPPORTED, due to:
Breakpoint 1, f (p=p@entry=0x7fffffffd844) at
/usr/src/gcc-7/gcc/testsuite/gcc.dg/guality/pr49888.c:18
18 v = 0; /* { dg-final { gdb-test 18 "!c" "1" } } */
pr49888.gdb:3: Error in sourced command file:
value has been optimized out
UNSUPPORTED: gcc.dg/guality/pr49888.c -O1 line 18 !c == 1
etc.
On the trunk without location views, it is a FAIL instead:
Breakpoint 1, f (p=p@entry=0x7fffffffd7d4) at
/usr/src/gcc/gcc/testsuite/gcc.dg/guality/pr49888.c:18
18 v = 0; /* { dg-final { gdb-test 18 "!c" "1" } } */
$1 = 0
$2 = 1
A debugging session is active.
Inferior 1 [process 11689] will be killed.
0 != 1
FAIL: gcc.dg/guality/pr49888.c -O1 line 18 !c == 1
The *.final dump is still correct, on the trunk:
1: NOTE_INSN_DELETED
25: NOTE_INSN_VAR_LOCATION{loc di:DI} ! p var
4: NOTE_INSN_BASIC_BLOCK 2
17: NOTE_INSN_PROLOGUE_END
3: NOTE_INSN_FUNCTION_BEG
21: NOTE_INSN_BEGIN_STMT
26: NOTE_INSN_VAR_LOCATION{loc [di:DI]} ! c var
22: NOTE_INSN_BEGIN_STMT
23: NOTE_INSN_BEGIN_STMT
11: [di:DI]=0x1
REG_DEAD di:DI
27: NOTE_INSN_VAR_LOCATION{loc (nil)} ! c var
24: NOTE_INSN_BEGIN_STMT
13: [`v']=0
18: NOTE_INSN_EPILOGUE_BEG
19: simple_return
20: barrier
16: NOTE_INSN_DELETED
and in 7.3 similarly with the NOTE_INSN_BEGIN_STMT deleted.
1: NOTE_INSN_DELETED
17: NOTE_INSN_VAR_LOCATION{loc di:DI} ! p var
4: NOTE_INSN_BASIC_BLOCK 2
13: NOTE_INSN_PROLOGUE_END
3: NOTE_INSN_FUNCTION_BEG
18: NOTE_INSN_VAR_LOCATION{loc [di:DI]} ! c var
8: [di:DI]=0x1
REG_DEAD di:DI
19: NOTE_INSN_VAR_LOCATION{loc (nil)}
9: [`v']=0
14: NOTE_INSN_EPILOGUE_BEG
15: simple_return
16: barrier
12: NOTE_INSN_DELETED
The bug is that the trunk without -gvariable-location-views makes:
.uleb128 0x2 # (DIE (0xb4) DW_TAG_variable)
.ascii "c\0" # DW_AT_name
.byte 0x1 # DW_AT_decl_file (pr49888.c)
.byte 0xa # DW_AT_decl_line
.byte 0x7 # DW_AT_decl_column
.long 0x41 # DW_AT_type
.uleb128 0x2 # DW_AT_location
.byte 0x75 # DW_OP_breg5
.sleb128 0
out of it rather than the expected:
.uleb128 0x9 # (DIE (0xaf) DW_TAG_variable)
.ascii "c\0" # DW_AT_name
.byte 0x1 # DW_AT_decl_file (pr49888.c)
.byte 0xa # DW_AT_decl_line
.long 0x40 # DW_AT_type
.long .LLST0 # DW_AT_location
that e.g. GCC 7 emits.
>From gcc-bugs-return-596701-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 10:47:25 2018
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Subject: [Bug target/70359] [6/7/8 Regression] Code size increase for x86/ARM/others compared to gcc-5.3.0
Date: Thu, 08 Mar 2018 10:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70359
--- Comment #34 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 8 Mar 2018, aldyh at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70359
>
> --- Comment #32 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
> As mentioned in the previous comment, the proposed patch brings down the count
> from 116 to 108 on ARM, but is shy of the desired 96.
>
> The missing bytes can be attributed to forwprop folding this (IL expanded for
> illustration):
>
> if (ui_7 / 10 != 0)
>
> into:
>
> if (ui_7 > 9)
>
> More specifically, changing this:
>
> # ui_7 = PHI <ui_13(2), ui_21(3)>
> ...
> ui_21 = ui_7 / 10;
> if (ui_21 != 0)
>
> into:
>
> # ui_7 = PHI <ui_13(2), ui_21(3)>
> ...
> ui_21 = ui_7 / 10;
> if (ui_7 > 9)
>
> Inhibiting this optimization brings down the byte count to 92 which is even
> lower than our 96 boogie man, so perhaps worth pursuing. (Assumes my proposed
> patch is also applied.) I'm no expert, but isn't a EQ/NE with 0 preferable
> than a <> with a non-zero?
>
> If so, should we restrict the folding somewhat, or clean this up after the
> fact?
>
> For reference, the folding (in forwprop) is due to this match.pd pattern:
>
> /* X / C1 op C2 into a simple range test. */
>
> ...though eliminating it causes another pattern to pick up the slack and do the
> same:
>
> /* Transform:
> * (X / Y) == 0 -> X < Y if X, Y are unsigned.
> * (X / Y) != 0 -> X >= Y, if X, Y are unsigned.
> */
>
> Eliminating both patterns "fixes" the problem.
>
> Suggestions welcome :).
In other places where this happened we add single_use () checks to
the patterns. The :s isn't really effective for patterns that
simplify into "simple" expressions. A patch doing that to the
two patterns in question would be OK I think.
Sth like
Index: gcc/match.pd
===================================================================
--- gcc/match.pd (revision 258359)
+++ gcc/match.pd (working copy)
@@ -1290,11 +1290,12 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
/* X / C1 op C2 into a simple range test. */
(for cmp (simple_comparison)
(simplify
- (cmp (trunc_div:s @0 INTEGER_CST@1) INTEGER_CST@2)
+ (cmp (trunc_div:s@3 @0 INTEGER_CST@1) INTEGER_CST@2)
(if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
&& integer_nonzerop (@1)
&& !TREE_OVERFLOW (@1)
- && !TREE_OVERFLOW (@2))
+ && !TREE_OVERFLOW (@2)
+ && single_use (@3))
(with { tree lo, hi; bool neg_overflow;
enum tree_code code = fold_div_compare (cmp, @1, @2, &lo, &hi,
&neg_overflow); }
tough there is at least one constant simplification result where
we shouldn't apply this restriction so moving the single_use check
to multiple places below or factoring things a bit would be
appropriate.
Similar for the other pattern then.
>From gcc-bugs-return-596702-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 10:49:39 2018
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Subject: [Bug target/70359] [6/7/8 Regression] Code size increase for x86/ARM/others compared to gcc-5.3.0
Date: Thu, 08 Mar 2018 10:49:00 -0000
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--- Comment #35 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 8 Mar 2018, segher at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70359
>
> --- Comment #33 from Segher Boessenkool <segher at gcc dot gnu.org> ---
> The "> 9" transform reduces path length. But foe -Os that is often not a
> good idea.
Hm, indeed - the > 9 might be notably faster. So it's not a clear
win to disable the folding here.
>From gcc-bugs-return-596703-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 10:49:48 2018
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Subject: [Bug tree-optimization/84746] [7 Regression] ICE on valid code at -O2 and -O3: Segmentation fault
Date: Thu, 08 Mar 2018 10:49:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P1 |P2
Known to work| |8.0
Target Milestone|8.0 |7.4
Summary|[8 Regression] ICE on valid |[7 Regression] ICE on valid
|code at -O2 and -O3: |code at -O2 and -O3:
|Segmentation fault |Segmentation fault
--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk, I'm eventually going to backport a variant of this.
>From gcc-bugs-return-596704-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 11:06:12 2018
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Subject: [Bug gcov-profile/84758] Wrong coverage for quite simple CFG
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|8.0 |9.0
>From gcc-bugs-return-596705-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 11:20:58 2018
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Subject: [Bug ipa/84658] [7/8 Regression] -O3 -fmerge-all-constants causes incorrect for-each loop generation.
Date: Thu, 08 Mar 2018 11:20:00 -0000
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--- Comment #14 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #13)
> So you can loses the TREE_ADDRESSABLE restriction somewhat in requiring at
> most one decl to be TREE_ADDRESSABLE - that's the one you need to keep, the
> others may become aliases. Given TREE_ADDRESSABLE isn't reliable for
> !TREE_STATIC vars
> we can't merge any exported decls that way. Consider
>
> const int foo1;
> const int foo2;
>
> int *bar(); // in other TU, returns address of foo1
>
> int main ()
> {
> if (bar() != &foo2)
> ...;
> }
>
> not sure if we want to do hand-waving saying that we can't possibly have
> points-to sets mentioning those without seeing the function IL. Well,
> might be similarly hand-waving as the reference aliasing issue.
>
> So we could drop the TREE_STATIC restriction if TREE_ADDRESSABLE is reliable
> within the current TU.
Note that this issue happens only with -fmerge-all-constants. And we have
caveat
in documentation that using the option, pointer comparison can be broken:
Languages like C or C++ require each variable,
including multiple instances of the same variable in recursive
calls, to have distinct locations, so using this option results in
non-conforming behavior.
Thus:
$ cat test.c
const int foo1 = 3;
const int foo2 = 3;
const int *
__attribute__((noinline))
bar()
{
return &foo1;
}
int main ()
{
if ((bar() - &foo2) == 0)
__builtin_abort ();
return 0;
}
$ gcc test.c -O2 -fno-ipa-icf -fmerge-all-constants && ./a.out
Aborted (core dumped)
That said, would be Richi your comment in c#12 a sufficient fix?
>From gcc-bugs-return-596706-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 11:21:02 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84552] [6/7/8 Regression] Compile time hog w/ -O2 -floop-nest-optimize -fno-tree-copy-prop -fno-tree-fre -fno-tree-loop-ivcanon
Date: Thu, 08 Mar 2018 11:21:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P4 |P2
Target Milestone|8.0 |6.5
Summary|[8 Regression] Compile time |[6/7/8 Regression] Compile
|hog w/ -O2 |time hog w/ -O2
|-floop-nest-optimize |-floop-nest-optimize
|-fno-tree-copy-prop |-fno-tree-copy-prop
|-fno-tree-fre |-fno-tree-fre
|-fno-tree-loop-ivcanon |-fno-tree-loop-ivcanon
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
So this is really a latent issue and not dependent on -floop-nest-optimize. It
materializes during unrolling where we perform SCEV analysis on not up-to-date
SSA form when analyzing.
>From gcc-bugs-return-596707-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 11:28:09 2018
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Subject: [Bug ipa/84658] [7/8 Regression] -O3 -fmerge-all-constants causes incorrect for-each loop generation.
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--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #14)
> (In reply to Richard Biener from comment #13)
> > So you can loses the TREE_ADDRESSABLE restriction somewhat in requiring at
> > most one decl to be TREE_ADDRESSABLE - that's the one you need to keep, the
> > others may become aliases. Given TREE_ADDRESSABLE isn't reliable for
> > !TREE_STATIC vars
> > we can't merge any exported decls that way. Consider
> >
> > const int foo1;
> > const int foo2;
> >
> > int *bar(); // in other TU, returns address of foo1
> >
> > int main ()
> > {
> > if (bar() != &foo2)
> > ...;
> > }
> >
> > not sure if we want to do hand-waving saying that we can't possibly have
> > points-to sets mentioning those without seeing the function IL. Well,
> > might be similarly hand-waving as the reference aliasing issue.
> >
> > So we could drop the TREE_STATIC restriction if TREE_ADDRESSABLE is reliable
> > within the current TU.
>
> Note that this issue happens only with -fmerge-all-constants. And we have
> caveat
> in documentation that using the option, pointer comparison can be broken:
>
> Languages like C or C++ require each variable,
> including multiple instances of the same variable in recursive
> calls, to have distinct locations, so using this option results in
> non-conforming behavior.
>
> Thus:
>
> $ cat test.c
> const int foo1 = 3;
> const int foo2 = 3;
>
> const int *
> __attribute__((noinline))
> bar()
> {
> return &foo1;
> }
>
> int main ()
> {
> if ((bar() - &foo2) == 0)
> __builtin_abort ();
>
> return 0;
> }
>
> $ gcc test.c -O2 -fno-ipa-icf -fmerge-all-constants && ./a.out
> Aborted (core dumped)
Sure, the caveat of -fmerge-all-constants is that different constants can be
merged.
But that doesn't imply that the #c0 failure is fine, the testcase doesn't
really care if kTestCases constant arrays from the two functions are merged
together or not, if not, they will be separate, if yes, they will be the same,
but if it doesn't try to compare them in any way, it should make zero
difference on the behavior.
>From gcc-bugs-return-596708-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 11:30:04 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/84658] [7/8 Regression] -O3 -fmerge-all-constants causes incorrect for-each loop generation.
Date: Thu, 08 Mar 2018 11:30:00 -0000
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--- Comment #16 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #14)
> (In reply to Richard Biener from comment #13)
> > So you can loses the TREE_ADDRESSABLE restriction somewhat in requiring at
> > most one decl to be TREE_ADDRESSABLE - that's the one you need to keep, the
> > others may become aliases. Given TREE_ADDRESSABLE isn't reliable for
> > !TREE_STATIC vars
> > we can't merge any exported decls that way. Consider
> >
> > const int foo1;
> > const int foo2;
> >
> > int *bar(); // in other TU, returns address of foo1
> >
> > int main ()
> > {
> > if (bar() != &foo2)
> > ...;
> > }
> >
> > not sure if we want to do hand-waving saying that we can't possibly have
> > points-to sets mentioning those without seeing the function IL. Well,
> > might be similarly hand-waving as the reference aliasing issue.
> >
> > So we could drop the TREE_STATIC restriction if TREE_ADDRESSABLE is reliable
> > within the current TU.
>
> Note that this issue happens only with -fmerge-all-constants. And we have
> caveat
> in documentation that using the option, pointer comparison can be broken:
>
> Languages like C or C++ require each variable,
> including multiple instances of the same variable in recursive
> calls, to have distinct locations, so using this option results in
> non-conforming behavior.
>
> Thus:
>
> $ cat test.c
> const int foo1 = 3;
> const int foo2 = 3;
>
> const int *
> __attribute__((noinline))
> bar()
> {
> return &foo1;
> }
>
> int main ()
> {
> if ((bar() - &foo2) == 0)
> __builtin_abort ();
>
> return 0;
> }
>
> $ gcc test.c -O2 -fno-ipa-icf -fmerge-all-constants && ./a.out
> Aborted (core dumped)
>
> That said, would be Richi your comment in c#12 a sufficient fix?
Hum, isn't the bug INVALID then? Shouldn't we restrict -fmerge-all-constants
to not address-taken variables to not make the option useless?
The suggested fix in c#12 is a band-aid only.
What's the impact of not merging TREE_ADDRESSABLE decls into other decls?
I presume -fmerge-all-constants pre-dates ICF?
>From gcc-bugs-return-596709-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 11:34:24 2018
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Subject: [Bug ipa/84658] [7/8 Regression] -O3 -fmerge-all-constants causes incorrect for-each loop generation.
Date: Thu, 08 Mar 2018 11:34:00 -0000
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--- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #16)
> Hum, isn't the bug INVALID then? Shouldn't we restrict -fmerge-all-constants
No.
> to not address-taken variables to not make the option useless?
-fmerge-all-constants is an extension where the addresses of the constant
variables may be the same even if without the option they would need to be
guaranteed to be different. That is the whole point of the option, many people
just don't care about it and care more about .rodata size, so they have an
option to tell the compiler about it.
> I presume -fmerge-all-constants pre-dates ICF?
Yes, by far. -fmerge-all-constants is from 2001, ICF from 2014.
>From gcc-bugs-return-596710-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 11:36:16 2018
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Subject: [Bug inline-asm/84742] internal compiler error: in process_alt_operands, at lra-constraints.c:2112
Date: Thu, 08 Mar 2018 11:36:00 -0000
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--- Comment #2 from Vegard Nossum <vegard.nossum at gmail dot com> ---
Created attachment 43598
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43598&action=edit
ASAN output
I compiled gcc itself using -fstack-protector-all -fsanitize=address and it
occasionally gives me the "heap-use-after-free" error (log attached).
>From gcc-bugs-return-596711-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 11:44:11 2018
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Subject: [Bug middle-end/54183] Generate __udivmoddi4 instead of __udivdi3 plus __umoddi3
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Ruslan <b7.10110111 at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |b7.10110111 at gmail dot com
--- Comment #1 from Ruslan <b7.10110111 at gmail dot com> ---
This seems to be fixed in GCC 7: see https://godbolt.org/g/Mz3Qi6 for example.
>From gcc-bugs-return-596712-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 11:52:57 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84759] New: Calculation of quotient and remainder with constant denominator uses __umoddi3+__udivdi3 instead of __udivmoddi4
Date: Thu, 08 Mar 2018 11:52:00 -0000
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Bug ID: 84759
Summary: Calculation of quotient and remainder with constant
denominator uses __umoddi3+__udivdi3 instead of
__udivmoddi4
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
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Starting from GCC 7, code calculating both quotient and remainder of a loong
division calls a single __udivmodti4. But this only happens for general values
of denominator, while for specific constants for some reason GCC still
generates calls to __umodti3 and __udivti3. See the following code (the picture
is the same for x86 and amd64 targets):
#ifdef __SIZEOF_INT128__
typedef __uint128_t Longer;
#else
typedef unsigned long long Longer;
#endif
typedef unsigned long Shorter;
Shorter divmod(Longer numerator, Shorter denominator, Shorter* remainder)
{
*remainder = numerator%denominator;
return numerator/denominator;
}
Shorter divmodConst(Longer numerator, Shorter* remainder)
{
const Shorter denominator = 100;
*remainder = numerator%denominator;
return numerator/denominator;
}
Here divmod is optimized, while divmodConst appears not optimized:
divmod:
sub esp, 28
xor edx, edx
mov eax, DWORD PTR [esp+40]
lea ecx, [esp+8]
sub esp, 12
push ecx
push edx
push eax
push DWORD PTR [esp+60]
push DWORD PTR [esp+60]
call __udivmoddi4
mov edx, DWORD PTR [esp+76]
mov ecx, DWORD PTR [esp+40]
mov DWORD PTR [edx], ecx
add esp, 60
ret
divmodConst:
push edi
push esi
sub esp, 4
mov esi, DWORD PTR [esp+16]
mov edi, DWORD PTR [esp+20]
push 0
push 100
push edi
push esi
call __umoddi3
add esp, 16
mov edx, DWORD PTR [esp+24]
mov DWORD PTR [edx], eax
push 0
push 100
push edi
push esi
call __udivdi3
add esp, 20
pop esi
pop edi
ret
>From gcc-bugs-return-596713-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 11:55:51 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug inline-asm/84742] internal compiler error: in process_alt_operands, at lra-constraints.c:2112
Date: Thu, 08 Mar 2018 11:55:00 -0000
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--- Comment #3 from Vegard Nossum <vegard.nossum at gmail dot com> ---
gcc/recog.c:2395 is:
2390 case '0': case '1': case '2': case '3': case '4':
2391 case '5': case '6': case '7': case '8': case '9':
2392 {
2393 char *end;
2394 op_alt[i].matches = strtoul (p, &end, 10);
2395 op_alt[op_alt[i].matches].matched = i;
2396 p = end;
2397 }
2398 continue;
It's a bit weird because I don't see any digits in the constraints in the test
case.
>From gcc-bugs-return-596714-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 11:57:24 2018
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Subject: [Bug debug/84456] [8 regression] gcc.dg/guality/pr49888.c fail
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So, the bug is that GCC 7's dw_loc_list tail:
/* Try to avoid the overhead of a location list emitting a location
expression instead, but only if we didn't have more than one
location entry in the first place. If some entries were not
representable, we don't want to pretend a single entry that was
applies to the entire scope in which the variable is
available. */
if (list && loc_list->first->next)
gen_llsym (list);
has been replaced with:
/* Try to avoid the overhead of a location list emitting a location
expression instead, but only if we didn't have more than one
location entry in the first place. If some entries were not
representable, we don't want to pretend a single entry that was
applies to the entire scope in which the variable is
available. */
maybe_gen_llsym (list);
where maybe_gen_llsym has:
if (!list || (!list->dw_loc_next && !loc_list_has_views (list)))
return;
gen_llsym (list);
That is not really equivalent; it is equivalent in the other spot, where it
used to be:
if (list && list->dw_loc_next)
gen_llsym (list);
and now is:
maybe_gen_llsym (list);
but in the first case, we were calling gen_llsym even when list &&
list->dw_loc_next == NULL, intentionally so, that means we got some location
note that would start the range and then another one that resets the range.
The following patch fixes this for me:
2018-03-08 Jakub Jelinek <jakub@redhat.com>
PR debug/84456
* dwarf2out.c (dw_loc_list): If list && loc_list->first->next, call
gen_llsym, otherwise call maybe_gen_llsym.
--- gcc/dwarf2out.c.jj 2018-03-02 00:15:54.704780976 +0100
+++ gcc/dwarf2out.c 2018-03-08 12:54:01.794054675 +0100
@@ -17076,7 +17076,10 @@ dw_loc_list (var_loc_list *loc_list, tre
representable, we don't want to pretend a single entry that was
applies to the entire scope in which the variable is
available. */
- maybe_gen_llsym (list);
+ if (list && loc_list->first->next)
+ gen_llsym (list);
+ else
+ maybe_gen_llsym (list);
return list;
}
The maybe_gen_llsym will cover the case when -gvariable-location-views and
list && list->dw_loc_next == NULL && loc_list->first->next == NULL and the
single entry list has some non-zero view.
>From gcc-bugs-return-596715-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 12:06:35 2018
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Subject: [Bug driver/83193] Help for invalid -march= options from cc1 omits -march=native on x86-64, arm. aarch64, output also inconsistent
Date: Thu, 08 Mar 2018 12:06:00 -0000
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ktkachov at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ktkachov at gcc dot gnu.org
--- Comment #14 from ktkachov at gcc dot gnu.org ---
I'm testing a patch for issue 2b) from
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83193#c6 .
Thanks for Andrew for the report and thanks Martin for the analysis!
>From gcc-bugs-return-596716-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 12:18:13 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84178] [7/8 Regression] ICE in release_bb_predicate
Date: Thu, 08 Mar 2018 12:18:00 -0000
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--- Comment #6 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Author: dmalcolm
Date: Thu Mar 8 12:17:36 2018
New Revision: 258363
URL: https://gcc.gnu.org/viewcvs?rev=258363&root=gcc&view=rev
Log:
tree-if-conv.c: fix ICE seen with -fno-tree-forwprop (PR
tree-optimization/84178)
PR tree-optimization/84178 reports a couple of source files that ICE inside
ifcvt when compiled with -03 -fno-tree-forwprop (trunk and gcc 7).
Both cases involve problems with ifcvt's per-BB gimplified predicates.
Testcase 1 fails this assertion within release_bb_predicate during cleanup:
283 if (flag_checking)
284 for (gimple_stmt_iterator i = gsi_start (stmts);
285 !gsi_end_p (i); gsi_next (&i))
286 gcc_assert (! gimple_use_ops (gsi_stmt (i)));
The testcase contains a division in the loop, which leads to
if_convertible_loop_p returning false (due to gimple_could_trap_p being true
for the division). This happens *after* the per-BB gimplified predicates
have been created in predicate_bbs (loop).
Hence tree_if_conversion bails out to "cleanup", but the gimplified predicates
exist and make use of SSA names; for example this conjunction for two BB
conditions:
_4 = h4.1_112 != 0;
_175 = (signed char) _117;
_176 = _175 >= 0;
_174 = _4 & _176;
is using SSA names.
This assertion was added in r236498 (aka
c3deca2519d97c55876869c57cf11ae1e5c6cf8b):
2016-05-20 Richard Biener <rguenther@suse.de>
* tree-if-conv.c (add_bb_predicate_gimplified_stmts): Use
gimple_seq_add_seq_without_update.
(release_bb_predicate): Assert we have no operands to free.
(if_convertible_loop_p_1): Calculate post dominators later.
Do not free BB predicates here.
(combine_blocks): Do not recompute BB predicates.
(version_loop_for_if_conversion): Save BB predicates around
loop versioning.
* gcc.dg/tree-ssa/ifc-cd.c: Adjust.
The following patch fixes this by adding a call to gimple_seq_discard
to release_bb_predicate. It also updates the assertion, so that
instead of asserting the stmts have no imm uses, instead assert that
they weren't added to a bb before discarding them (otherwise discarding
them would be a bug). We know this is the case because
insert_gimplified_predicates has:
/* Once the sequence is code generated, set it to NULL. */
set_bb_predicate_gimplified_stmts (bb, NULL);
but asserting it seems appropriate as a double-check.
The patch doesn't address the 2nd issue within PR tree-optimization/84178.
gcc/ChangeLog:
PR tree-optimization/84178
* tree-if-conv.c (release_bb_predicate): Remove the
the assertion that the stmts have NULL use_ops.
Discard the statements, asserting that they haven't
yet been added to a BB.
gcc/testsuite/ChangeLog:
PR tree-optimization/84178
* gcc.c-torture/compile/pr84178-1.c: New test.
Added:
trunk/gcc/testsuite/gcc.c-torture/compile/pr84178-1.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-if-conv.c
>From gcc-bugs-return-596717-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 12:20:45 2018
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From: "ramana.radhakrishnan at foss dot arm.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84521] [8 Regression] aarch64: Frame-pointer corruption with __builtin_setjmp/__builtin_longjmp and -fomit-frame-pointer
Date: Thu, 08 Mar 2018 12:20:00 -0000
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--- Comment #18 from ramana.radhakrishnan at foss dot arm.com ---
On 07/03/2018 18:59, sudi at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84521
>
> --- Comment #17 from sudi at gcc dot gnu.org ---
> I looked up what other targets were doing and one thing found to be interesting
> was that a lot of them are defining the target hook
> TARGET_BUILTIN_SETJMP_FRAME_VALUE. In AArch64 case I am suggesting to define it
> to return the hard frame pointer. That seems to solve the issue with both the
> attached test case and the test that Wilco mentioned.
>
> Does this look like it solves "mid-end versus back-end : who fixes this issue"
> problem?
>
> I am still pretty new to knowing how the stack should actually look. So calling
> for some help!
>
> Sudi
>
That looks sensible. Especially see the comment in arc/arc.c - that
seems to mirror the decision we want in AArch64 as well. The logic /
comment around this in the arc port seems quite reasonable to me and
looks like what we can have on AArch64 as well.
Ramana
>From gcc-bugs-return-596718-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 12:22:38 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug inline-asm/84742] internal compiler error: in process_alt_operands, at lra-constraints.c:2112
Date: Thu, 08 Mar 2018 12:22:00 -0000
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--- Comment #4 from Vegard Nossum <vegard.nossum at gmail dot com> ---
So I think the problem is that this loop in lra_set_insn_recog_data() counts
the number of commas and uses that as the number of alternatives:
1018 for (p = constraints[0]; *p; p++)
1019 nalt += *p == ',';
And then later we can skip over the comma inside preprocess_constraints()
because 'T' is not recognised in the switch and then it does:
p += CONSTRAINT_LEN (c, p);
where CONSTRAINT_LEN for 'T' is 2:
static inline size_t
insn_constraint_len (char fc, const char *str ATTRIBUTE_UNUSED)
{
switch (fc)
{
case 'B': return 2;
case 'T': return 2;
case 'W': return 2;
case 'Y': return 2;
default: break;
}
return 1;
}
(so the real problematic bit of the constraint is this: "T,")
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Subject: [Bug tree-optimization/84178] [7/8 Regression] ICE in release_bb_predicate
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--- Comment #7 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
(In reply to David Malcolm from comment #6)
> Author: dmalcolm
> Date: Thu Mar 8 12:17:36 2018
> New Revision: 258363
This fixes the testcase in comment #0 on trunk. Not yet fixed for
gcc-7-branch.
The testcase in comment #2 still affects trunk and gcc-7-branch; candidate
patch for that is here:
https://gcc.gnu.org/ml/gcc-patches/2018-03/msg00376.html
>From gcc-bugs-return-596720-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 12:39:28 2018
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From: "prathamesh3492 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84759] Calculation of quotient and remainder with constant denominator uses __umoddi3+__udivdi3 instead of __udivmoddi4
Date: Thu, 08 Mar 2018 12:39:00 -0000
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prathamesh3492 at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |prathamesh3492 at gcc dot gnu.org
--- Comment #1 from prathamesh3492 at gcc dot gnu.org ---
In the former case, the divmod transform takes place and we emit call to
__udivmoddi4. However it does't trigger for divmodConst, because we avoid
handling constants in the transform since expand_divmod has specialized
expansions for few constants, which would otherwise have been missed. I suppose
this could be somewhat improved.
Thanks,
Prathamesh
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Subject: [Bug tree-optimization/84178] [7/8 Regression] ICE in release_bb_predicate
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--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Mar 8 12:56:40 2018
New Revision: 258364
URL: https://gcc.gnu.org/viewcvs?rev=258364&root=gcc&view=rev
Log:
2018-03-08 Richard Biener <rguenther@suse.de>
PR tree-optimization/84178
* tree-if-conv.c (combine_blocks): Move insert_gimplified_predicates
to caller.
(version_loop_for_if_conversion): Delay update_ssa call.
(tree_if_conversion): Delay update_ssa until after predicate
insertion.
* gcc.dg/torture/pr84178-2.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr84178-2.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-if-conv.c
>From gcc-bugs-return-596722-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 13:03:50 2018
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Subject: [Bug lto/81004] [7 Regression] linking failed with -flto and static libboost_program_options
Date: Thu, 08 Mar 2018 13:03:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81004
--- Comment #34 from Jan Hubicka <hubicka at ucw dot cz> ---
Hi,
I do not get any assertion at lto.c:840, so please also check if that still
reproduce
with current branch and let us know the backtrace.
Honza
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/84658] [7/8 Regression] -O3 -fmerge-all-constants causes incorrect for-each loop generation.
Date: Thu, 08 Mar 2018 13:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84658
--- Comment #18 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 8 Mar 2018, jakub at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84658
>
> --- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
> (In reply to Richard Biener from comment #16)
> > Hum, isn't the bug INVALID then? Shouldn't we restrict -fmerge-all-constants
>
> No.
>
> > to not address-taken variables to not make the option useless?
>
> -fmerge-all-constants is an extension where the addresses of the constant
> variables may be the same even if without the option they would need to be
> guaranteed to be different. That is the whole point of the option, many people
> just don't care about it and care more about .rodata size, so they have an
> option to tell the compiler about it.
That's not really an answer to the question ...
But anyway, we have precedence in points-to-set editing which we do
during RTL expansion to reflect variable coalescing.
So ... a different approach for fixing would be if ICF would keep
a) a global bitmap of all DECL_UID that took part in any merging operation
b) a mapping of merged DECL_UID to prevailing DECL_UID (which is also the
DECL_PT_UID of the merged ones)
then during IPA ICF transform phase do
FOR_EACH_DEFINED_FUNCTION (...)
{
FOR_EACH_SSA_NAME_FN (..., name)
if (POINTER_TYPE_P (TREE_TYPE (name))
&& SSA_NAME_PTR_INFO (name))
fixup_pt_set (&SSA_NAME_PTR_INFO (name)->pt);
fixup_pt_set (fn->gimple_df->escaped);
/* The above get's us to 99% I guess, at least catching the
address compares. Below also gets us aliasing correct
but as said we're giving leeway to the situation with
readonly vars anyway, so ... */
FOR_EACH_BB_FN (...)
for (each-stmt)
if (is_gimple_call (...))
{
fixup_pt_set (gimple_call_use_set (call));
fixup_pt_set (gimple_call_clobber_set (call));
}
}
and fixup_pt_set essentially doing
EXECUTE_IF_AND_IN_BITMAP (pt->vars, bitmap-of-merged-decls, 0, i, bi)
bitmap_set_bit (pt->vars, *merged_uid_to_pt_uid->get (i));
that would be a "real" fix, also allowing the forthcoming pointer
comparison optimization using two pointers (and thus two points-to
sets).
> > I presume -fmerge-all-constants pre-dates ICF?
>
> Yes, by far. -fmerge-all-constants is from 2001, ICF from 2014.
>From gcc-bugs-return-596724-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 13:19:50 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug inline-asm/84742] internal compiler error: in process_alt_operands, at lra-constraints.c:2112
Date: Thu, 08 Mar 2018 13:19:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC| |jakub at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
Target Milestone|--- |8.0
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
We have many loops that assume the constraints are sane and it is safe to skip
all the CONSTRAINT_LEN characters, so I think it is desirable to catch this
early.
asm_operand_ok already has:
len = CONSTRAINT_LEN (c, constraint);
do
constraint++;
while (--len && *constraint);
if (len)
return 0;
which catches multi-character constraints with '\0' in the middle of it, and
rejects those during vregs pass that also removes them:
if (asm_noperands (PATTERN (insn)) >= 0)
{
if (!check_asm_operands (PATTERN (insn)))
{
error_for_asm (insn, "impossible constraint in %<asm%>");
/* For asm goto, instead of fixing up all the edges
just clear the template and clear input operands
(asm goto doesn't have any output operands). */
if (JUMP_P (insn))
{
rtx asm_op = extract_asm_operands (PATTERN (insn));
ASM_OPERANDS_TEMPLATE (asm_op) = ggc_strdup ("");
ASM_OPERANDS_INPUT_VEC (asm_op) = rtvec_alloc (0);
ASM_OPERANDS_INPUT_CONSTRAINT_VEC (asm_op) = rtvec_alloc (0);
}
else
delete_insn (insn);
}
}
So I'm just adding a check for ',' inside such constraints too.
>From gcc-bugs-return-596725-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 13:28:57 2018
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Subject: [Bug lto/81004] [7 Regression] linking failed with -flto and static libboost_program_options
Date: Thu, 08 Mar 2018 13:28:00 -0000
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--- Comment #35 from Christophe Lyon <clyon at gcc dot gnu.org> ---
It took me a while to reproduce manually: there is an ICE at r258321, which is
fixed by the next backport (r258322), at which point there 6 failures on
aarch64-none-elf:
FAIL: g++.dg/lto/20081125 cp_lto_20081125_0.o-cp_lto_20081125_1.o link, -flto
-flto-partition=1to1
FAIL: g++.dg/lto/20090311 cp_lto_20090311_0.o-cp_lto_20090311_1.o link, -O0
-flto -flto-partition=none -fuse-linker-plugin
FAIL: g++.dg/lto/20090311 cp_lto_20090311_0.o-cp_lto_20090311_1.o link, -O0
-flto -fuse-linker-plugin -fno-fat-lto-objects
FAIL: g++.dg/lto/20091210-1 cp_lto_20091210-1_0.o-cp_lto_20091210-1_1.o link,
-O0 -flto -flto-partition=none -fuse-linker-plugin
FAIL: g++.dg/lto/20091210-1 cp_lto_20091210-1_0.o-cp_lto_20091210-1_1.o link,
-O0 -flto -fuse-linker-plugin -fno-fat-lto-objects
FAIL: g++.dg/torture/pr67600.C -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects (test for excess errors)
But my first manual attempt at r258359 had no failure, so the above ones a
probably fixed between r258322 and r258359.
My validation is triggered at every commit on the release branches, so
sometimes this gives too much detail it seems :)
>From gcc-bugs-return-596726-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 13:30:58 2018
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Subject: [Bug inline-asm/84742] internal compiler error: in process_alt_operands, at lra-constraints.c:2112
Date: Thu, 08 Mar 2018 13:30:00 -0000
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43599
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43599&action=edit
gcc8-pr84742.patch
Untested fix.
>From gcc-bugs-return-596727-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 13:36:57 2018
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Subject: [Bug ipa/84658] [7/8 Regression] -O3 -fmerge-all-constants causes incorrect for-each loop generation.
Date: Thu, 08 Mar 2018 13:36:00 -0000
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--- Comment #19 from Martin Liška <marxin at gcc dot gnu.org> ---
Just having chat with Honza and he is curious why IPA passes should maintain
points-to-sets info as it's rebuild in pass_build_alias quite soon in post IPA
passes? Another question is why the pass_rebuild_alias isn't the first one and
is sitting after CCP?
Isn't also possible to release all points-to-sets before IPA passes? That can
save some memory.
>From gcc-bugs-return-596728-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 13:38:49 2018
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Subject: [Bug ipa/84658] [7/8 Regression] -O3 -fmerge-all-constants causes incorrect for-each loop generation.
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--- Comment #20 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
How would IPA-PTA work then?
>From gcc-bugs-return-596729-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 13:42:00 2018
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Subject: [Bug ipa/84658] [7/8 Regression] -O3 -fmerge-all-constants causes incorrect for-each loop generation.
Date: Thu, 08 Mar 2018 13:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84658
--- Comment #21 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #20)
> How would IPA-PTA work then?
Not having experience how that works, but I would expect a complete rebuild.
Similar to what the tree PTA does?
>From gcc-bugs-return-596730-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 13:45:44 2018
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Subject: [Bug lto/81004] [7 Regression] linking failed with -flto and static libboost_program_options
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |FIXED
--- Comment #36 from Martin Liška <marxin at gcc dot gnu.org> ---
That said it's fixed.
>From gcc-bugs-return-596731-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 13:49:03 2018
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Subject: [Bug c++/80452] [DR 1579] incorrect value category deduced for return value
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--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
return std::move(cv);
>From gcc-bugs-return-596732-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 13:50:26 2018
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Subject: [Bug ipa/84658] [7/8 Regression] -O3 -fmerge-all-constants causes incorrect for-each loop generation.
Date: Thu, 08 Mar 2018 13:50:00 -0000
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--- Comment #22 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #21)
> (In reply to Jakub Jelinek from comment #20)
> > How would IPA-PTA work then?
>
> Not having experience how that works, but I would expect a complete rebuild.
> Similar to what the tree PTA does?
Note that the TREE PTA is just a TODO_rebuild_alias flag. Thus I would expect
IPA PTA is also a rebuild of PTA information.
>From gcc-bugs-return-596733-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 13:54:34 2018
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Subject: [Bug target/84277] [8 Regression] A lot of new acats testsuite failures
Date: Thu, 08 Mar 2018 13:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84277
--- Comment #15 from Rainer Emrich <rainer@emrich-ebersheim.de> ---
Hi Eric,
thanks for all your work.
Unfortunately your changes introduced an ICE while building binutils 2.19.1:
make[4]: Entering directory
'/opt/devel/SCRATCH/tmp.5VoInHZZvv/gcc-8.0.0/binutils-2.29.1/opcodes'
/bin/sh ./libtool --tag=CC --mode=compile gcc -DHAVE_CONFIG_H -I.
-I/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes -I.
-I/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes -I../bfd
-I/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes/../include
-I/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes/../bfd -I./../intl
-W -Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow -Wstack-usage=262144
-g -O2 -D__USE_MINGW_ACCESS -MT i386-dis.lo -MD -MP -MF .deps/i386-dis.Tpo -c
-o i386-dis.lo
/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes/i386-dis.c
libtool: compile: gcc -DHAVE_CONFIG_H -I.
-I/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes -I.
-I/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes -I../bfd
-I/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes/../include
-I/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes/../bfd -I./../intl
-W -Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow -Wstack-usage=262144
-g -O2 -D__USE_MINGW_ACCESS -MT i386-dis.lo -MD -MP -MF .deps/i386-dis.Tpo -c
/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes/i386-dis.c -o
i386-dis.o
during RTL pass: final
D:/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes/i386-dis.c: In
function 'print_insn':
D:/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes/i386-dis.c:13471:1:
internal compiler error: in i386_pe_seh_cold_init, at config/i386/winnt.c:913
}
^
libbacktrace could not find executable to open
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
make[4]: *** [Makefile:1005: i386-dis.lo] Error 1
make[4]: Leaving directory
'/opt/devel/SCRATCH/tmp.5VoInHZZvv/gcc-8.0.0/binutils-2.29.1/opcodes'
I did not run the testsuite so far. I always bootstrap gcc, build all
prerequisites with the just bootstrapped gcc and boostrap again using the
bootstrapped gcc as bootstrap compiler. This process has uncovered several
issues in the past, including this one.
>From gcc-bugs-return-596734-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 14:08:23 2018
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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84277] [8 Regression] A lot of new acats testsuite failures
Date: Thu, 08 Mar 2018 14:08:00 -0000
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--- Comment #16 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <https://gcc.gnu.org/bugs/> for instructions.
> make[4]: *** [Makefile:1005: i386-dis.lo] Error 1
> make[4]: Leaving directory
> '/opt/devel/SCRATCH/tmp.5VoInHZZvv/gcc-8.0.0/binutils-2.29.1/opcodes'
Then do as indicated and open a new bug report.
>From gcc-bugs-return-596735-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 14:13:48 2018
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Subject: [Bug target/84760] New: Finish implementation of __builtin_altivec_lvx_v1ti
Date: Thu, 08 Mar 2018 14:13:00 -0000
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Bug ID: 84760
Summary: Finish implementation of __builtin_altivec_lvx_v1ti
Product: gcc
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The gcc/config/rs6000/rs6000-builtin.def source file contains an entry that
introduces the enumeration constant ALTIVEC_BUILTIN_LVX_V1TI and the built-in
function __builtin_atlivec_lvx_v1ti:
BU_ALTIVEC_X (LVX_V1TI, "lvx_v1ti", MEM)
The remainder of the implementation, which is required to define the prototype
for this function and to connect the function with its implementation, is
missing. This was an apparent oversight at the time that this definition was
introduced. T
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/84658] [7/8 Regression] -O3 -fmerge-all-constants causes incorrect for-each loop generation.
Date: Thu, 08 Mar 2018 14:34:00 -0000
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--- Comment #23 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 8 Mar 2018, marxin at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84658
>
> --- Comment #22 from Martin Liška <marxin at gcc dot gnu.org> ---
> (In reply to Martin Liška from comment #21)
> > (In reply to Jakub Jelinek from comment #20)
> > > How would IPA-PTA work then?
> >
> > Not having experience how that works, but I would expect a complete rebuild.
> > Similar to what the tree PTA does?
>
> Note that the TREE PTA is just a TODO_rebuild_alias flag. Thus I would expect
> IPA PTA is also a rebuild of PTA information.
IPA PTA rebuilds everything (and with -fipa-pta we should be fine). The
issue is the time between IPA ICF and the late pass_build_alias,
we do the "invalid" folding in pass_ccp.
And yes, we do want to do some scalar cleanup before running PTA.
If we'd decide not to then the "proper" place would probably be
pass_ipa_pta which then either would do local PTA or IPA PTA based
on the flag.
But that's too much for GCC 8 or 7.
>From gcc-bugs-return-596737-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 14:35:02 2018
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From: "vincent-gcc at vinc17 dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/84761] New: AddressSanitizer is not compatible with glibc 2.27 on x86
Date: Thu, 08 Mar 2018 14:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84761
Bug ID: 84761
Summary: AddressSanitizer is not compatible with glibc 2.27 on
x86
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: sanitizer
Assignee: unassigned at gcc dot gnu.org
Reporter: vincent-gcc at vinc17 dot net
CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
jakub at gcc dot gnu.org, kcc at gcc dot gnu.org, marxin at gcc dot gnu.org
Target Milestone: ---
After an upgrade to glibc 2.27 on a Debian/unstable machine, on a program that
does nothing, the AddressSanitizer segfaults with the 32-bit x86 ABI.
I have the following gcc-snapshot script:
#!/bin/sh
LD_LIBRARY_PATH=/usr/lib/gcc-snapshot/lib:$LD_LIBRARY_PATH
PATH=/usr/lib/gcc-snapshot/bin:$PATH
rpath=""
OLD_IFS="$IFS"
IFS=:
for i in $LD_RUN_PATH
do
rpath="$rpath -Wl,-rpath -Wl,$i"
done
IFS="$OLD_IFS"
exec gcc -Wl,-rpath -Wl,/usr/lib/gcc-snapshot/lib \
-Wl,-rpath -Wl,/usr/lib/gcc-snapshot/lib32 \
-Wl,-rpath -Wl,/usr/lib/gcc-snapshot/libx32 $rpath "$@"
cventin:~> gcc-snapshot --version
gcc (Debian 20180216-1) 8.0.1 20180216 (experimental) [trunk revision 257720]
[...]
cventin:~> cat tst.c
int main (void)
{
return 0;
}
cventin:~> gcc-snapshot -m32 -fsanitize=address tst.c -o tst
cventin:~> ./tst
AddressSanitizer:DEADLYSIGNAL
=================================================================
==25032==ERROR: AddressSanitizer: SEGV on unknown address 0xf7fa7e70 (pc
0xf7fa7e84 bp 0xffbf40ac sp 0xffbf406c T16777215)
==25032==The signal is caused by a WRITE memory access.
#0 0xf7fa7e83 in _dl_get_tls_static_info (/lib/ld-linux.so.2+0x11e83)
#1 0xf7ac147d (/usr/lib/gcc-snapshot/lib32/libasan.so.5+0x10e47d)
#2 0xf7aafd27 (/usr/lib/gcc-snapshot/lib32/libasan.so.5+0xfcd27)
#3 0xf7fa591a (/lib/ld-linux.so.2+0xf91a)
#4 0xf7f96cb9 (/lib/ld-linux.so.2+0xcb9)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/lib/ld-linux.so.2+0x11e83) in
_dl_get_tls_static_info
==25032==ABORTING
My original bug report:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892096
The explanations given by Aurelien Jarno:
------------------------------------------------------------
The AddressSanitizer is using glibc internal functions though dlsym(), and such
functions have the right to change in new major versions:
From libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc:
| void *get_tls_static_info_ptr = dlsym(RTLD_NEXT, "_dl_get_tls_static_info");
And on the glibc side:
| $ readelf -s /lib/ld-linux.so.2 | grep _dl_get_tls_static_info
| 4: 00011e70 35 FUNC GLOBAL DEFAULT 12
_dl_get_tls_static_info@@GLIBC_PRIVATE
This has been discussed for example there:
https://www.sourceware.org/ml/libc-alpha/2018-02/msg00611.html
The AddressSanitizer people should discuss for a public API so that it doesn't
happen again. Otherwise it might break at every new glibc version.
------------------------------------------------------------
In the mean time, it should at least be made compatible with glibc 2.27.
>From gcc-bugs-return-596738-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 14:42:17 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84552] [6/7/8 Regression] Compile time hog w/ -O2 -floop-nest-optimize -fno-tree-copy-prop -fno-tree-fre -fno-tree-loop-ivcanon
Date: Thu, 08 Mar 2018 14:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84552
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Mar 8 14:41:39 2018
New Revision: 258365
URL: https://gcc.gnu.org/viewcvs?rev=258365&root=gcc&view=rev
Log:
2018-03-08 Richard Biener <rguenther@suse.de>
PR middle-end/84552
* tree-scalar-evolution.c: Include tree-into-ssa.h.
(follow_copies_to_constant): Do not follow SSA names registered
for update.
* gcc.dg/graphite/pr84552.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/graphite/pr84552.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-scalar-evolution.c
>From gcc-bugs-return-596739-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 14:55:42 2018
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From: "jorrit at jorrit dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/84569] [6 Regression] g++ -g -O3 consumes all memory
Date: Thu, 08 Mar 2018 14:55:00 -0000
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--- Comment #5 from Jö <jorrit at jorrit dot de> ---
I can report that that indeed fixes the issue for us; the unit test now
compiles fine with gcc revision 258359. Thanks a lot!
>From gcc-bugs-return-596740-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 14:58:23 2018
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From: "sirl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/84762] New: GCC for PowerPC32 violates the SysV ABI spec for small struct returns
Date: Thu, 08 Mar 2018 14:58:00 -0000
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Bug ID: 84762
Summary: GCC for PowerPC32 violates the SysV ABI spec for small
struct returns
Product: gcc
Version: 6.4.1
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Host: x86_64-linux
Target: powerpc-eabi
For an example like:
struct smallstruct { char a; char b; char c; };
struct smallstruct f(void)
{
struct smallstruct s = { 0x11, 0x22, 0x33 };
return s;
}
r3 should look like 0x11223300, but GCC returns 0x00112233 in r3 (with the '00'
part actually being undefined).
The relevant part of the spec
https://www.polyomino.org.uk/publications/2011/Power-Arch-32-bit-ABI-supp-1.0-Embedded.pdf:
Aggregates or unions whose size is less than or equal to eight bytes shall be
returned in r3 and r4, as if they were first stored in memory area and then the
low-addressed word were loaded in r3 and the high-addressed word were loaded
into r4. Bits beyond the last member of the structure or union are not defined.
Or the older http://refspecs.linux-foundation.org/elf/elfspec_ppc.pdf says
nearly the same (with an additional alignment clause):
A structure or union whose size is less than or equal to 8 bytes shall be
returned in r3 and r4, as if it were first stored in an 8-byte aligned memory
area and then the low-addressed word were loaded into r3 and the high-addressed
word into r4. Bits beyond the last member of the structure or union are not
defined.
This was discovered during parameter passing tests as a difference to a
proprietary compiler.
As it is probably too late in the game to change GCC, this is more a
documentation request I guess.
Eventually -msvr4-struct-return could be extended to
-msvr4-struct-return={sysv,gnu} with 'gnu' as the (compile-time configurable?)
default.
>From gcc-bugs-return-596741-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 15:51:12 2018
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From: "ktkachov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84748] [8 Regression] wrong code with u128 at aarch64 at -O and and above
Date: Thu, 08 Mar 2018 15:51:00 -0000
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--- Comment #3 from ktkachov at gcc dot gnu.org ---
Author: ktkachov
Date: Thu Mar 8 15:50:25 2018
New Revision: 258366
URL: https://gcc.gnu.org/viewcvs?rev=258366&root=gcc&view=rev
Log:
[AArch64] PR target/84748: Mark *compare_cstore<mode>_insn as clobbering CC reg
In this wrong-code PR the combine pass ends up moving a CC-using instruction
past a *compare_cstore<mode>_insn
insn_and_split. After reload the *compare_cstore<mode>_insn splitter ends up
generating a SUBS instruction that
clobbers the condition flags, and things go bad.
The solution is simple, the *compare_cstore<mode>_insn pattern should specify
that it clobbers the CC register
so that combine (or any other pass) does not assume that it can move CC-using
patterns across it.
This patch does that and fixes the testcase.
The testcase FAILs on GCC 8 only, but the buggy pattern is in GCC 6 onwards, so
we should backport this as
a latent bug fix after it's had some time to bake in trunk.
Bootstrapped and tested on aarch64-none-linux-gnu.
PR target/84748
* config/aarch64/aarch64.md (*compare_cstore<mode>_insn): Mark pattern
as clobbering CC_REGNUM.
* gcc.c-torture/execute/pr84748.c: New test.
Added:
trunk/gcc/testsuite/gcc.c-torture/execute/pr84748.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/aarch64/aarch64.md
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/84748] [6/7 Regression] wrong code with u128 at aarch64 at -O and and above
Date: Thu, 08 Mar 2018 15:52:00 -0000
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ktkachov at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P1 |P2
Known to work| |6.4.1
Summary|[8 Regression] wrong code |[6/7 Regression] wrong code
|with u128 at aarch64 at -O |with u128 at aarch64 at -O
|and and above |and and above
--- Comment #4 from ktkachov at gcc dot gnu.org ---
Fixed on trunk. The testcase doesn't abort on the branches but the buggy
pattern is there so the fix is worth backporting. I'll do it once it's baked on
trunk for a bit
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Subject: [Bug target/84760] Finish implementation of __builtin_altivec_lvx_v1ti
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--- Comment #1 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Hm. For this one I think I would recommend we just remove the partial
implementation, provided that vec_ld already supports vector __int128.
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From: "wschmidt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/84753] GCC does not fold xxswapd followed by vperm
Date: Thu, 08 Mar 2018 15:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84753
Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-08
Ever confirmed|0 |1
--- Comment #6 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
We should keep this issue open for a different problem, though. When swap
optimization doesn't succeed on such a loop, we don't end up optimizing away
the xxlnand associated with the vperm on Power8. Currently that is only done
as part of swap optimization. It's a minor savings but worth doing.
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Subject: [Bug rtl-optimization/84753] GCC does not fold xxswapd followed by vperm
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Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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From: "wilco at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84521] [8 Regression] aarch64: Frame-pointer corruption with __builtin_setjmp/__builtin_longjmp and -fomit-frame-pointer
Date: Thu, 08 Mar 2018 15:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84521
--- Comment #19 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to sudi from comment #17)
> I looked up what other targets were doing and one thing found to be
> interesting was that a lot of them are defining the target hook
> TARGET_BUILTIN_SETJMP_FRAME_VALUE. In AArch64 case I am suggesting to define
> it to return the hard frame pointer. That seems to solve the issue with both
> the attached test case and the test that Wilco mentioned.
>
> Does this look like it solves "mid-end versus back-end : who fixes this
> issue" problem?
>
> I am still pretty new to knowing how the stack should actually look. So
> calling for some help!
This is not about stack layout but ensuring we don't corrupt the frame pointer
or the stack pointer. Any changes to SP/FP are inherently extremely risky and
need to be done exactly right or lots of things will fail.
There are too many issues to make a full list, but here are a few obvious ones:
1. The TARGET_BUILTIN_SETJMP_FRAME_VALUE only fixes the store of the frame
pointer, however it does not fix the landing pad, I see code like this:
str x29, [x3, #:lo12:.LANCHOR0]
mov x0, sp
stp x1, x0, [x2, 8]
bl baz
.p2align 2
.L7:
sub x29, x29, #176
ldr w0, [x29, 172]
mov sp, x29
So now the store is correct, but when returning at L2 we corrupt the frame
pointer badly (and then the stack pointer as well)... This is basically the
same as pr60003.c but with an alloca added.
2. We still need to force the frame pointer to be saved,
TARGET_BUILTIN_SETJMP_FRAME_VALUE doesn't fix that.
3. __builtin_longjmp is still incorrect, like I showed in PR64242, it also
fails on AArch64:
#include <setjmp.h>
#include <string.h>
void bug (jmp_buf buf)
{
jmp_buf buf2;
memcpy (buf2, buf, sizeof (jmp_buf));
__builtin_longjmp (buf2, 1);
}
bug:
stp x29, x30, [sp, -336]!
mov x1, x0
mov x2, 312
mov x29, sp
add x0, x29, 24
bl memcpy
ldr x0, [x29, 32]
ldr x29, [x29, 24] // oops
ldr x1, [x29, 40]
mov sp, x1
br x0
4. Trying to use setjmp and longjmp in the same function often gives this ICE:
during RTL pass: cse1
setjmp.c: In function ‘bug1’:
setjmp.c:86:1: internal compiler error: in mark_jump_label_1, at jump.c:1151
}
^
0xa598f7 mark_jump_label_1
/home/wdijkstr/gcc/gcc/jump.c:1151
0xa59a6b mark_jump_label_1
/home/wdijkstr/gcc/gcc/jump.c:1211
0xa59a6b mark_jump_label_1
/home/wdijkstr/gcc/gcc/jump.c:1211
0xa59e17 mark_all_labels
/home/wdijkstr/gcc/gcc/jump.c:305
0xa59e17 rebuild_jump_labels_1
/home/wdijkstr/gcc/gcc/jump.c:74
0x128ce23 rest_of_handle_cse
/home/wdijkstr/gcc/gcc/cse.c:7628
0x128ce23 execute
/home/wdijkstr/gcc/gcc/cse.c:7662
5. Things get really interesting on ARM and Thumb-2 where there are multiple
frame pointer registers. This shows again why it is wrong to change the sp/fp
in the longjmp - for it to work correctly it must be done in the landing pad in
the function that has the setjmp.
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Subject: [Bug target/84763] New: [8 Regression] ICE in i386_pe_seh_cold_init
Date: Thu, 08 Mar 2018 15:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84763
Bug ID: 84763
Summary: [8 Regression] ICE in i386_pe_seh_cold_init
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Created attachment 43600
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43600&action=edit
preprocessed source
Building binutils 2.29.1 there's an ICE in i386_pe_seh_cold_init.
make[2]: Entering directory '/opt/devel/SCRATCH/tmp/opcodes'
/bin/sh ./libtool --tag=CC --mode=compile gcc -DHAVE_CONFIG_H -I.
-I/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes -I.
-I/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes -I../bfd
-I/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes/../include
-I/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes/../bfd -I./../intl
-W -Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow -Wstack-usage=262144
-g -O2 -D__USE_MINGW_ACCESS -MT i386-dis.lo -MD -MP -MF .deps/i386-dis.Tpo -c
-o i386-dis.lo
/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes/i386-dis.c
libtool: compile: gcc -DHAVE_CONFIG_H -I.
-I/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes -I.
-I/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes -I../bfd
-I/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes/../include
-I/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes/../bfd -I./../intl
-W -Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow -Wstack-usage=262144
-g -O2 -D__USE_MINGW_ACCESS -MT i386-dis.lo -MD -MP -MF .deps/i386-dis.Tpo -c
/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes/i386-dis.c -o
i386-dis.o
during RTL pass: final
D:/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes/i386-dis.c: In
function 'print_insn':
D:/opt/devel/gnu/src/gcc-mingw-w64/binutils-2.29.1/opcodes/i386-dis.c:13471:1:
internal compiler error: in i386_pe_seh_cold_init, at config/i386/winnt.c:913
}
^
libbacktrace could not find executable to open
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
make[2]: *** [Makefile:1005: i386-dis.lo] Error 1
make[2]: Leaving directory '/opt/devel/SCRATCH/tmp/opcodes'
Caused by r258338.
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Subject: [Bug target/84763] [8 Regression] ICE in i386_pe_seh_cold_init
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug target/67288] [6/7/8 regression] non optimal simple function (useless additional shift/remove/shift/add)
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with my r204516 change aka
https://gcc.gnu.org/ml/gcc-patches/2013-11/msg00768.html
The changes in *.optimized dump look reasonable, fewer IVs:
<bb 3>:
+ # RANGE [16, 4294967280]
+ _18 = _22 * 16;
+ # RANGE [0, 4294967295]
+ _9 = _18 + _6;
+ _3 = (void *) _9;
<bb 4>:
# PT = nonlocal
# ALIGN = 16, MISALIGN = 0
# addr_23 = PHI <addr_15(5), addr_7(3)>
- # RANGE [0, 4294967295] NONZERO 0x0000000000fffffff
- # i_24 = PHI <i_14(5), 0(3)>
__asm__ __volatile__("dcbf 0, %0" : : "r" addr_23 : "memory");
- # RANGE [0, 4294967295] NONZERO 0x0000000000fffffff
- i_14 = i_24 + 1;
# PT = nonlocal
# ALIGN = 16, MISALIGN = 0
addr_15 = addr_23 + 16;
- if (i_14 != _22)
+ if (addr_15 != _3)
The * 16 is present in GIMPLE, but the right shift by 4 / division by 16 is
something added in the doloop pass later on, so this doesn't seem to be
something that can be optimized in GIMPLE.
On the trunk, we have in *.optimized:
# RANGE [0, 268435455] NONZERO 268435455
_20 = size_12 >> 4;
if (_20 != 0)
goto <bb 3>; [89.00%]
else
goto <bb 6>; [11.00%]
<bb 3> [local count: 105119325]:
# RANGE [16, 4294967280]
_6 = _20 * 16;
_4 = _1 + _6;
_3 = (void *) _4;
<bb 4> [local count: 955630224]:
# PT = nonlocal null
# ALIGN = 16, MISALIGN = 0
# addr_21 = PHI <addr_10(3), addr_15(4)>
__asm__ __volatile__("dcbf 0, %0" : : "r" addr_21 : "memory");
# PT = nonlocal null
# ALIGN = 16, MISALIGN = 0
addr_15 = addr_21 + 16;
if (_3 != addr_15)
goto <bb 4>; [89.00%]
else
goto <bb 5>; [11.00%]
To optimize this on RTL we'd need to have accurate value range info, otherwise
optimizing (unsigned) (x << 4 + (cst << 4)) >> 4 into x + cst is not valid.
Before *.combine we have:
(insn 16 15 17 3 (set (reg:SI 135)
(ashift:SI (reg:SI 128 [ _20 ])
(const_int 4 [0x4]))) 269 {ashlsi3}
(expr_list:REG_DEAD (reg:SI 128 [ _20 ])
(nil)))
(insn 17 16 42 3 (set (reg/f:SI 122 [ _3 ])
(plus:SI (reg:SI 135)
(reg/v/f:SI 127 [ addr ]))) 72 {*addsi3}
(expr_list:REG_DEAD (reg:SI 135)
(nil)))
(insn 42 17 43 3 (set (reg:SI 138)
(minus:SI (reg/f:SI 122 [ _3 ])
(reg/v/f:SI 127 [ addr ]))) -1
(expr_list:REG_DEAD (reg/f:SI 122 [ _3 ])
(nil)))
(insn 43 42 44 3 (set (reg:SI 139)
(plus:SI (reg:SI 138)
(const_int -16 [0xfffffffffffffff0]))) -1
(expr_list:REG_DEAD (reg:SI 138)
(nil)))
(insn 44 43 45 3 (set (reg:SI 140)
(lshiftrt:SI (reg:SI 139)
(const_int 4 [0x4]))) -1
(expr_list:REG_DEAD (reg:SI 139)
(nil)))
and only combine turns that into:
(insn 42 17 43 3 (set (reg:SI 138)
(ashift:SI (reg:SI 128 [ _20 ])
(const_int 4 [0x4]))) 269 {ashlsi3}
(expr_list:REG_DEAD (reg:SI 128 [ _20 ])
(nil)))
(insn 43 42 44 3 (set (reg:SI 139)
(plus:SI (reg:SI 138)
(const_int -16 [0xfffffffffffffff0]))) 72 {*addsi3}
(expr_list:REG_DEAD (reg:SI 138)
(nil)))
(insn 44 43 45 3 (set (reg:SI 140)
(lshiftrt:SI (reg:SI 139)
(const_int 4 [0x4]))) 279 {lshrsi3}
(expr_list:REG_DEAD (reg:SI 139)
(nil)))
(insn 45 44 21 3 (set (reg:SI 137)
(plus:SI (reg:SI 140)
(const_int 1 [0x1]))) 72 {*addsi3}
(expr_list:REG_DEAD (reg:SI 140)
(nil)))
While reg:SI 128 is set only once and thus in theory we could in theory use in
RTL the corresponding GIMPLE value ranges for that SSA_NAME, the SSA_NAME for
_20 is [0, 268435455] and thus only allows us to figure out that << 4 will not
shift away any bits out of it (i.e. that (r128 << 4) >> 4 is equal to r128. We
need to know that it can't be zero as well, which on GIMPLE is present in the
value range of _6 - [16, 4294967280], but unfortunately that info is lost
during TER, pseudo 135 doesn't really have REG_EXPR set.
Maybe that would be fixable by some expander work.
Then the question is if we actually can use GIMPLE VRP info during RTL
optimizations, and whether all optimizations on RTL that would invalidate that
reset REG_EXPR or could in some other way signal that the VRP info can't be
trusted.
The combiner first optimizes:
Trying 17 -> 42:
17: r122:SI=r135:SI+r127:SI
REG_DEAD r135:SI
42: r138:SI=r122:SI-r127:SI
REG_DEAD r122:SI
Successfully matched this instruction:
(set (reg:SI 138)
(reg:SI 135))
and then:
Trying 16 -> 42:
16: r135:SI=r128:SI<<0x4
REG_DEAD r128:SI
42: r138:SI=r135:SI
REG_DEAD r135:SI
Successfully matched this instruction:
(set (reg:SI 138)
(ashift:SI (reg:SI 128 [ _20 ])
(const_int 4 [0x4])))
so if we had VRP info on _6 aka (reg:SI 135 [ _6 ]) we'd need to signal that it
is the same on r138.
And then have some way to query it and somewhere optimize.
>From gcc-bugs-return-596750-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 16:14:28 2018
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Subject: [Bug target/84521] [8 Regression] aarch64: Frame-pointer corruption with __builtin_setjmp/__builtin_longjmp and -fomit-frame-pointer
Date: Thu, 08 Mar 2018 16:14:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ebotcazou at gcc dot gnu.org
--- Comment #20 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
You can use __builtin_setjmp and __builtin_longjmp in the same function, only
if they use a different buffer. Otherwise it is invalid. So, while we
shouldn't ICE on invalid code, not sure why you are listing 4 here.
CCing Eric for the other __builtin_setjmp related issues.
>From gcc-bugs-return-596751-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 16:21:36 2018
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Subject: [Bug target/84763] [8 regression] ICE in i386_pe_seh_cold_init
Date: Thu, 08 Mar 2018 16:21:00 -0000
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-03-08
Assignee|unassigned at gcc dot gnu.org |ebotcazou at gcc dot gnu.org
Summary|[8 Regression] ICE in |[8 regression] ICE in
|i386_pe_seh_cold_init |i386_pe_seh_cold_init
Ever confirmed|0 |1
--- Comment #1 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Thanks, I'm going to have a look.
>From gcc-bugs-return-596752-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 16:33:10 2018
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Subject: [Bug target/84521] [8 Regression] aarch64: Frame-pointer corruption with __builtin_setjmp/__builtin_longjmp and -fomit-frame-pointer
Date: Thu, 08 Mar 2018 16:33:00 -0000
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--- Comment #21 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> You can use __builtin_setjmp and __builtin_longjmp in the same function,
> only if they use a different buffer. Otherwise it is invalid.
Yes, that's invalid.
> CCing Eric for the other __builtin_setjmp related issues.
I don't see anything special with Aarch64 that would make it impossible to
support __builtin_setjmp/__builtin_longjmp properly. You can parameterize a
lot of things in the back-end with TARGET_BUILTIN_SETJMP_FRAME_VALUE and
various patterns like:
save_stack_nonlocal
restore_stack_nonlocal,
nonlocal_goto_receiver,
builtin_setjmp_setup,
builtin_setjmp_receiver,
builtin_longjmp
See the documentation and existing ports.
>From gcc-bugs-return-596753-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 08 16:41:46 2018
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^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/84695] Missed opportunity to issue warning about override
2018-03-04 6:16 [Bug c++/84695] New: Missed opportunity to issue warning about override drepper.fsp+rhbz at gmail dot com
@ 2022-01-07 3:56 ` pinskia at gcc dot gnu.org
2022-02-04 8:03 ` [Bug c++/84695] Missed opportunity to issue warning about override [-Winconsistent-missing-override] egallager at gcc dot gnu.org
2022-07-15 6:38 ` dcb314 at hotmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-01-07 3:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84695
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Clang has -Winconsistent-missing-override which is turned on by default and
provides the warning:
<source>:8:7: warning: 'two' overrides a member function but is not marked
'override' [-Winconsistent-missing-override]
int two(int) { return 102; }
^
<source>:4:15: note: overridden virtual function is here
virtual int two(int) { return 2; }
^
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/84695] Missed opportunity to issue warning about override [-Winconsistent-missing-override]
2018-03-04 6:16 [Bug c++/84695] New: Missed opportunity to issue warning about override drepper.fsp+rhbz at gmail dot com
2022-01-07 3:56 ` [Bug c++/84695] " pinskia at gcc dot gnu.org
@ 2022-02-04 8:03 ` egallager at gcc dot gnu.org
2022-07-15 6:38 ` dcb314 at hotmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: egallager at gcc dot gnu.org @ 2022-02-04 8:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84695
Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Missed opportunity to issue |Missed opportunity to issue
|warning about override |warning about override
| |[-Winconsistent-missing-ove
| |rride]
CC| |egallager at gcc dot gnu.org
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
adding suggested name for the warning to the title
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/84695] Missed opportunity to issue warning about override [-Winconsistent-missing-override]
2018-03-04 6:16 [Bug c++/84695] New: Missed opportunity to issue warning about override drepper.fsp+rhbz at gmail dot com
2022-01-07 3:56 ` [Bug c++/84695] " pinskia at gcc dot gnu.org
2022-02-04 8:03 ` [Bug c++/84695] Missed opportunity to issue warning about override [-Winconsistent-missing-override] egallager at gcc dot gnu.org
@ 2022-07-15 6:38 ` dcb314 at hotmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: dcb314 at hotmail dot com @ 2022-07-15 6:38 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84695
David Binderman <dcb314 at hotmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dcb314 at hotmail dot com
--- Comment #3 from David Binderman <dcb314 at hotmail dot com> ---
Interestingly, gcc trunk source code produces this warning when
compiled by clang:
$ fgrep Winco /tmp/0 | sort | uniq -c
1 ../../trunk.git/gcc/analyzer/region-model.cc:3007:8: warning:
'visit_unaryop_svalue' overrides a member function but is not marked 'override'
[-Winconsistent-missing-override]
1 ../../trunk.git/gcc/analyzer/region-model.cc:3031:8: warning:
'visit_repeated_svalue' overrides a member function but is not marked
'override' [-Winconsistent-missing-override]
2 ../../trunk.git/gcc/config/i386/i386-features.h:184:8: warning:
'convert_op' overrides a member function but is not marked 'override'
[-Winconsistent-missing-override]
2 ../../trunk.git/gcc/config/i386/i386-features.h:199:8: warning:
'convert_op' overrides a member function but is not marked 'override'
[-Winconsistent-missing-override]
11 ../../trunk.git/gcc/value-range-equiv.h:57:8: warning: 'set_undefined'
overrides a member function but is not marked 'override'
[-Winconsistent-missing-override]
11 ../../trunk.git/gcc/value-range-equiv.h:58:8: warning: 'set_varying'
overrides a member function but is not marked 'override'
[-Winconsistent-missing-override]
11 ../../trunk.git/gcc/value-range-equiv.h:68:8: warning: 'dump' overrides
a member function but is not marked 'override'
[-Winconsistent-missing-override]
$
A couple in the analyzer, a couple in the i386 machine specific code and 3
in value-range-equiv.h.
Might be worth fixing ?
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-07-15 6:38 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2018-03-04 6:16 [Bug c++/84695] New: Missed opportunity to issue warning about override drepper.fsp+rhbz at gmail dot com
2022-01-07 3:56 ` [Bug c++/84695] " pinskia at gcc dot gnu.org
2022-02-04 8:03 ` [Bug c++/84695] Missed opportunity to issue warning about override [-Winconsistent-missing-override] egallager at gcc dot gnu.org
2022-07-15 6:38 ` dcb314 at hotmail dot com
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