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* [Bug target/85666] gcc-8.0.1 fails to build mmix target: gcc/libgcc/libgcc2.h:203:20: internal compiler error: in leaf_function_p, at final.c:4488
[not found] <bug-85666-4@http.gcc.gnu.org/bugzilla/>
@ 2018-05-09 0:35 ` hp at gcc dot gnu.org
2018-05-28 0:07 ` hp at gcc dot gnu.org
1 sibling, 0 replies; 2+ messages in thread
From: hp at gcc dot gnu.org @ 2018-05-09 0:35 UTC (permalink / raw)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85666
Hans-Peter Nilsson <hp at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hp at gcc dot gnu.org
--- Comment #4 from Hans-Peter Nilsson <hp at gcc dot gnu.org> ---
(In reply to Sergei Trofimovich from comment #0)
> gcc-7.3.0 worked. gcc-8.0.1 fails as:
Don't you mean "9.0.1" which is what gcc outputs for the trunk?
Perhaps "both" and you copy-pasted output from trunk after the release?
An SVN revision number and "trunk" or branch name is generally preferable in
spot reports from git or svn, but I guess I can make use of the git revision
mentioned in comment #2, thanks for that.
> gcc version 9.0.0 20180505 (experimental) (GCC)
FWIW, I hope to have a look at this next weekend.
Thanks for the report.
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85698] [8/9 Regression] CPU2017 525.x264_r fails starting with r257581
Date: Wed, 09 May 2018 00:45:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85698
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |8.2
Summary|CPU2017 525.x264_r fails |[8/9 Regression] CPU2017
|starting with r257581 |525.x264_r fails starting
| |with r257581
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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++/85706] [8 regression][concepts] Bogus "deduced class type in function return type"
Date: Wed, 09 May 2018 02:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85706
Jason Merrill <jason at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|ASSIGNED |RESOLVED
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--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug c++/85706] [8 regression][concepts] Bogus "deduced class type in function return type"
Date: Wed, 09 May 2018 02:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85706
--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Wed May 9 02:08:59 2018
New Revision: 260067
URL: https://gcc.gnu.org/viewcvs?rev=260067&root=gcc&view=rev
Log:
PR c++/85706 - class deduction under decltype
* pt.c (for_each_template_parm_r): Handle DECLTYPE_TYPE. Clear
*walk_subtrees whether or not we walked into the operand.
(type_uses_auto): Only look at deduced contexts.
Added:
branches/gcc-8-branch/gcc/testsuite/g++.dg/concepts/class-deduction2.C
Modified:
branches/gcc-8-branch/gcc/cp/ChangeLog
branches/gcc-8-branch/gcc/cp/pt.c
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85706] [8 regression][concepts] Bogus "deduced class type in function return type"
Date: Wed, 09 May 2018 02:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85706
--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Wed May 9 02:08:52 2018
New Revision: 260066
URL: https://gcc.gnu.org/viewcvs?rev=260066&root=gcc&view=rev
Log:
PR c++/85706 - class deduction under decltype
* pt.c (for_each_template_parm_r): Handle DECLTYPE_TYPE. Clear
*walk_subtrees whether or not we walked into the operand.
(type_uses_auto): Only look at deduced contexts.
Added:
trunk/gcc/testsuite/g++.dg/concepts/class-deduction2.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/pt.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++/85646] [7/8/9 Regression] Incorrect lambda visibility with -fvisibility=hidden
Date: Wed, 09 May 2018 02:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85646
--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Wed May 9 02:34:03 2018
New Revision: 260069
URL: https://gcc.gnu.org/viewcvs?rev=260069&root=gcc&view=rev
Log:
PR c++/85646 - lambda visibility.
* decl2.c (determine_visibility): Don't mess with template arguments
from the containing scope.
(vague_linkage_p): Check DECL_ABSTRACT_P before looking at a 'tor
thunk.
Added:
branches/gcc-7-branch/gcc/testsuite/g++.dg/ext/visibility/lambda1.C
Modified:
branches/gcc-7-branch/gcc/cp/ChangeLog
branches/gcc-7-branch/gcc/cp/decl2.c
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Subject: [Bug c++/85646] [7/8/9 Regression] Incorrect lambda visibility with -fvisibility=hidden
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Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed for 7.4 and 8.2.
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From: "violetcrestfall at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85708] New: A corrupt fold expression passed compilation
Date: Wed, 09 May 2018 02:46:00 -0000
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Bug ID: 85708
Summary: A corrupt fold expression passed compilation
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: violetcrestfall at hotmail dot com
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Created attachment 44095
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44095&action=edit
A corrupt fold expression example that passed compilation with GCC
The example attached has passed compilation with
GCC 8.1 (on gcc.godbolt.org) and GCC 8.0.1 (r259500).
The 5th line in the example:
(std::cerr << "Error: " << ... << std::forward<tArgs>(vArgs)) << std::endl;
[std::cerr << "Error: "] is not a cast-expression apparently, so this
expression should not have been recognized as a fold-expression.
The code failed to be compiled with MSVC 19.14 and Clang 6.0.0, which is the
correct behavior.
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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++/85707] -Wclass-memaccess should excempt safe usage inside of a class and its friends
Date: Wed, 09 May 2018 02:49:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-05-09
CC| |msebor at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Can you please provide some examples of the use cases you have in mind? (Test
cases that trigger the warning.)
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From: "violetcrestfall at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85708] A corrupt fold expression passed compilation
Date: Wed, 09 May 2018 02:52:00 -0000
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--- Comment #1 from violetcrestfall at hotmail dot com ---
Sorry for typo: GCC 8.0.1 (r259590).
>From gcc-bugs-return-604119-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 04:14:42 2018
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From: "redbeard0531 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85707] -Wclass-memaccess should excempt safe usage inside of a class and its friends
Date: Wed, 09 May 2018 04:14:00 -0000
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--- Comment #2 from Mathias Stearn <redbeard0531 at gmail dot com> ---
Here is a boiled down example of some of our code that trips this warning:
https://godbolt.org/g/ChLrch. It also shows why we do this, since the codegen
is *substantially* better for init_table_memset than init_table_assignment, at
least at -O2. Even if you improve the codegen for that case tomorrow, we'd
still need to keep using memset for a while until we stop supporting older
compilers.
This is reduced from
https://github.com/mongodb/mongo/blob/11a3d5ccb1216da0e84d941fd48e486f72455ba4/src/mongo/db/pipeline/document_internal.h.
The actual key type is stored as a variable-lenth string stored directly in the
buffer and the Key type in the interface is our pre-17 string_view equivalent.
The value is actually a type called Value, that holds an internal 16-byte type
called ValueStorage as its only member. ValueStorage also triggers the warning
in its lifetime methods:
https://github.com/mongodb/mongo/blob/11a3d5ccb1216da0e84d941fd48e486f72455ba4/src/mongo/db/pipeline/value_internal.h#L165-L221
(the DEV macro expands to "if (DEBUG_BUILD)" so you can ignore anything on
those lines). If necessary I can try to boil down that type too, but it is much
more complex, so I'm not sure how small I can make it.
This is all to implement what is essentially a dynamically-typed JSON object
which is something we need to be *REALLY* fast. A lot of effort went into
micro-optimizing these types so that the business logic code doesn't need to
worry about any of this and can write very natural looking, modern c++ code.
All of this memory-munging is hidden in internal types in _internal.h files.
The user facing types are not supposed to expose any of this, except to the
implementations which are all friendly which each other.
The third_party code that is tripping this is in S2. It tries to memcpy
https://github.com/mongodb/mongo/blob/11a3d5ccb1216da0e84d941fd48e486f72455ba4/src/mongo/db/pipeline/value_internal.h#L165-L221
an array of S2Points (typedef for Vector3<double>)
https://github.com/mongodb/mongo/blob/11a3d5ccb1216da0e84d941fd48e486f72455ba4/src/third_party/s2/util/math/vector3.h#L30.
This doesn't meet the self-or-friend condition described in the ticket, so I'm
not sure what the solution there is, but it is an example of code that is
correct (I think, I haven't reviewed it *too* closely) but still triggers this
warning.
>From gcc-bugs-return-604120-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 04:14:58 2018
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Subject: [Bug middle-end/81478] By default, GCC emits a function call for complex multiplication, should partially inline that
Date: Wed, 09 May 2018 04:14:00 -0000
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Ben Woodard <woodard at redhat dot com> changed:
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CC| |woodard at redhat dot com
--- Comment #7 from Ben Woodard <woodard at redhat dot com> ---
We're hitting this issue over here at LLNL. On 86_64 it was just an annoyance
because users who ran into this problem just switched to ICC to work around it.
A similar thing happened with the power architecture where the workaround was
to use the XL compiler. ARM is making this a higher priority issue for us
because there are no vendor compilers to switch to.
>From gcc-bugs-return-604121-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 04:20:16 2018
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Subject: [Bug libstdc++/83140] assoc_legendre returns negated value when m is odd
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--- Comment #2 from emsr at gcc dot gnu.org ---
The fact that Boost followed us into this makes the situation interesting. We
are the only two impls that I know of. I like the std convention slightly
better but maybe we should ask for a lib change.
or not.
>From gcc-bugs-return-604122-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 04:20:36 2018
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Subject: [Bug middle-end/85704] cc1 run out of memory when it compile
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--- Comment #3 from Haruue Icymoon <haruue at caoyue dot com.cn> ---
* More Information
Tested the gcc that build with following commands can reproduce this problem.
wget https://ftp.gnu.org/gnu/gcc/gcc-8.1.0/gcc-8.1.0.tar.xz
tar -Jxf gcc-8.1.0.tar.xz
./configure --enable-languages=c --disable-multilib
make
make install
Then test it with
ulimit -m 1500000 -v 1500000
/usr/local/bin/gcc ubd_kern.i
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Subject: [Bug target/85666] gcc-8.0.1 fails to build mmix target: gcc/libgcc/libgcc2.h:203:20: internal compiler error: in leaf_function_p, at final.c:4488
Date: Wed, 09 May 2018 06:31:00 -0000
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--- Comment #5 from Sergei Trofimovich <slyfox at inbox dot ru> ---
(In reply to Hans-Peter Nilsson from comment #4)
> (In reply to Sergei Trofimovich from comment #0)
> > gcc-7.3.0 worked. gcc-8.0.1 fails as:
>
> Don't you mean "9.0.1" which is what gcc outputs for the trunk?
> Perhaps "both" and you copy-pasted output from trunk after the release?
Yes, both 8.0.1 and trunk do fail. 7.3.0 was last working version.
>From gcc-bugs-return-604124-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 07:21:01 2018
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Subject: [Bug middle-end/81478] By default, GCC emits a function call for complex multiplication, should partially inline that
Date: Wed, 09 May 2018 07:21:00 -0000
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ktkachov at gcc dot gnu.org changed:
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--- Comment #8 from ktkachov at gcc dot gnu.org ---
(In reply to Ben Woodard from comment #7)
> We're hitting this issue over here at LLNL. On 86_64 it was just an
> annoyance because users who ran into this problem just switched to ICC to
> work around it. A similar thing happened with the power architecture where
> the workaround was to use the XL compiler. ARM is making this a higher
> priority issue for us because there are no vendor compilers to switch to.
This looks like PR 70291. Can you please try a trunk compiler after r259889 ?
>From gcc-bugs-return-604125-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 07:21:14 2018
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Subject: [Bug tree-optimization/85697] At -Os nontrivial ctor does not use SSE to zero
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-09
CC| |jakub at gcc dot gnu.org
Component|target |tree-optimization
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
vectorization is not enabled at -Os (or at -O2), the SSE instructions are
generated by basic-block vectorization though I could imagine that
store-merging
could also generate those from
<bb 2> [100.00%]:
MEM[(struct &)&a] ={v} {CLOBBER};
MEM[(int *)&a] = 0;
MEM[(int *)&a + 8B] = 0;
UseA (&a);
_3 = a.a;
a ={v} {CLOBBER};
return _3;
The target would need to decide whether TImode stores are wanted or not
(via MAX_MOVE_PIECES or sth related). We could also, for -Os and some
embedded targets, consider emitting a memset from store-merging in case
regions are large enough and the initializer is memset compatible.
Similarly a MEM = {} could be used for zeroing, leaving actual implementation
to RTL expansion. What type to use here needs experimentation of course.
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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/85698] [8/9 Regression] CPU2017 525.x264_r fails starting with r257581
Date: Wed, 09 May 2018 07:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85698
Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |wrong-code
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmpf. Sounds like the issue requires "careful" preparation of stmt operand
order
(aka SSA name numbering). We've had issues in this area in the past.
Can you help me with isolating this to a single function inside that file?
Maybe try sticking __attribute__((optimize("no-tree-vectorize"))) on some
functions. Oh, there's also the vect_loop debug counter
(-fdbg-cnt=vect_loop:N).
Eventually we simply trigger a latent issue elsewhere when we now recognize
sth for SLP vectorization.
Otherwise I'll have to find a power8 machine where I can set up CPU 2017
myself (unlikely this week due to public holidays).
>From gcc-bugs-return-604128-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 07:28:37 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 tree-optimization/85699] [9 regression] gcc.dg/nextafter-2.c fail
Date: Wed, 09 May 2018 07:28:00 -0000
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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-604127-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 07:28:25 2018
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From: "david at westcontrol dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/85709] New: Consistent variable, type and function attributes across ports
Date: Wed, 09 May 2018 07:28:00 -0000
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Bug ID: 85709
Summary: Consistent variable, type and function attributes
across ports
Product: gcc
Version: unknown
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Component: c
Assignee: unassigned at gcc dot gnu.org
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gcc supports many different targets. For some of these, there can be special
attributes (variable, type, function) for particular features. This is
important to programming low-level and bare-metal code. Often these are for
particular features of the particular architecture, and that's fine.
However, they can also be more general attributes that might be of interest or
use across a range of ports. There are also cases where different ports have
attributes for the same feature, but are inconsistent about naming or other
details.
Would it be possible to tidy this up a little, giving more features and greater
consistency for people who work with multiple gcc targets?
Examples of attributes that could be generalised and used on many ports :
"naked" function attribute, for SPU, RISC-V, MSP430, AVR, and a few others.
"critical" function attribute for MSP430, which disables global interrupts
during the function. (Clearly this is not appropriate for all targets - but it
would be useful on many more devices than just the MSP430.)
"noinit" variable attribute for MSP430 that puts the variable in a different
section (not .bss) which is not cleared at startup. This can improve startup
times when you have large static arrays, and lets you keep data across resets.
It would be useful on many microcontrollers and small systems.
Examples of inconsistent attributes :
"interrupt" function attributes handled in different ways in different ports,
with different naming and details.
Function attributes to explicitly save all volatile registers (useful for
functions called from assembly or interrupt handlers), or to say that no
registers need to be saved (useful for RTOS thread task functions) - some ports
have these, with different names, but they are inconsistent and could be useful
on many targets.
>From gcc-bugs-return-604129-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 07:30:01 2018
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Subject: [Bug fortran/85701] ICE in mark_scope_block_unused, at tree-ssa-live.c:364
Date: Wed, 09 May 2018 07:30:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |openacc
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Sounds like wrecked BLOCK trees.
>From gcc-bugs-return-604130-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 07:38:12 2018
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Subject: [Bug c/85704] [8/9 Regression] cc1 run out of memory when it compile
Date: Wed, 09 May 2018 07:38:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86_64-*-*
Priority|P3 |P2
Status|UNCONFIRMED |NEW
Known to work| |7.3.0
Keywords| |needs-bisection,
| |needs-reduction
Last reconfirmed|2018-05-08 00:00:00 |2018-05-09
Component|middle-end |c
Ever confirmed|0 |1
Summary|cc1 run out of memory when |[8/9 Regression] cc1 run
|it compile |out of memory when it
| |compile
Target Milestone|--- |8.2
Known to fail| |8.1.0
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed with just -Os. We're stuck in parsing.
Run till exit from #0 0x0000000000874c8c in output_pending_init_elements (
all=1, braced_init_obstack=0x7fffffffc000)
at /space/rguenther/src/svn/gcc-8-branch/gcc/c/c-typeck.c:9392
...
>From gcc-bugs-return-604131-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 07:46:34 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85707] -Wclass-memaccess should excempt safe usage inside of a class and its friends
Date: Wed, 09 May 2018 07:46:00 -0000
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note for the example if you use -O3 the loop gets turned into memset() and the
code generated is the same besides the memset being conditional
on if (_buckets != 0)
For the diagnostic, isn't class Position "enough" POD so we can avoid the
diagnostic? So IMHO whatever the standard active considers (extended) PODs
should be not warned about (or the warning get multiple levels so users
get a choice?)
>From gcc-bugs-return-604134-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 07:50:04 2018
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Subject: [Bug tree-optimization/70291] muldc3 code generation could be smarter
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |smcallis at gmail dot com
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 81478 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-604132-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 07:50:01 2018
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Subject: [Bug tree-optimization/85694] Generation of vectorized AVG (Average) instruction
Date: Wed, 09 May 2018 07:50:00 -0000
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
OK, so adding another pattern plus IFN would be the canonical way of
vectorizing this.
>From gcc-bugs-return-604133-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 07:50:02 2018
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Subject: [Bug middle-end/81478] By default, GCC emits a function call for complex multiplication, should partially inline that
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Indeed a duplicate.
*** This bug has been marked as a duplicate of bug 70291 ***
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Subject: [Bug c++/70693] valgrind error in get_visual_column
Date: Wed, 09 May 2018 07:55:00 -0000
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David Binderman <dcb314 at hotmail dot com> changed:
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----------------------------------------------------------------------------
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Resolution|FIXED |---
--- Comment #2 from David Binderman <dcb314 at hotmail dot com> ---
Problem seems to have come back, somewhere between revisions 259747 and 259789
/home/dcb/gcc/results.259742.ubsan/bin/gcc
/home/dcb/gcc/results.259747.asan/bin/gcc
/home/dcb/gcc/results.259789/bin/gcc
bug277.cc: In member function ‘bool
{anonymous}::SgmlFilter::process_char(FilterChar::Chr)’:
bug277.cc:54:39: internal compiler error: in operator[], at input.h:62
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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85638] [8/9 regression] build failure for Ada runtime with SJLJ exceptions on x86
Date: Wed, 09 May 2018 07:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85638
--- Comment #16 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Author: ebotcazou
Date: Wed May 9 07:58:29 2018
New Revision: 260070
URL: https://gcc.gnu.org/viewcvs?rev=260070&root=gcc&view=rev
Log:
PR rtl-optimization/85638
* bb-reorder.c: Include common/common-target.h.
(create_forwarder_block): New function extracted from...
(fix_up_crossing_landing_pad): ...here. Rename into...
(dw2_fix_up_crossing_landing_pad): ...this.
(sjlj_fix_up_crossing_landing_pad): New function.
(find_rarely_executed_basic_blocks_and_crossing_edges): In SJLJ mode,
call sjlj_fix_up_crossing_landing_pad if there are incoming EH edges
from both partitions and exit the loop after one iteration.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/bb-reorder.c
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Subject: [Bug rtl-optimization/85638] [8/9 regression] build failure for Ada runtime with SJLJ exceptions on x86
Date: Wed, 09 May 2018 08:03:00 -0000
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--- Comment #17 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Author: ebotcazou
Date: Wed May 9 07:59:46 2018
New Revision: 260071
URL: https://gcc.gnu.org/viewcvs?rev=260071&root=gcc&view=rev
Log:
PR rtl-optimization/85638
* bb-reorder.c: Include common/common-target.h.
(create_forwarder_block): New function extracted from...
(fix_up_crossing_landing_pad): ...here. Rename into...
(dw2_fix_up_crossing_landing_pad): ...this.
(sjlj_fix_up_crossing_landing_pad): New function.
(find_rarely_executed_basic_blocks_and_crossing_edges): In SJLJ mode,
call sjlj_fix_up_crossing_landing_pad if there are incoming EH edges
from both partitions and exit the loop after one iteration.
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/bb-reorder.c
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Subject: [Bug sanitizer/85556] attribute no_sanitize does not accept multiple options as documented
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
Known to fail| |8.1.0
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Mine.
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Subject: [Bug ipa/85656] gcc.dg/ipa/ipa-icf-38.c FAILs
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-05-09
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Mine.
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Subject: [Bug ipa/85607] [9 Regression] ice in add_type, at ipa-icf.c:1583
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Mine.
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Subject: [Bug tree-optimization/70291] muldc3 code generation could be smarter
Date: Wed, 09 May 2018 08:26:00 -0000
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--- Comment #6 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to ktkachov from comment #4)
> Implemented for GCC 9.
Since multiple people seem interested in the improvement, would it be useful to
backport?
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Subject: [Bug rtl-optimization/85638] [8/9 regression] build failure for Ada runtime with SJLJ exceptions on x86
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Resolution|--- |FIXED
--- Comment #18 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Thanks for reporting the problem.
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Subject: [Bug c++/19808] miss a warning about uninitialized member usage in member initializer list in constructor
Date: Wed, 09 May 2018 08:39:00 -0000
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--- Comment #39 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jason Merrill from comment #38)
> (In reply to Jonathan Wakely from comment #37)
>
> If you add a
>
> Y y{};
>
> GCC warns about the Y constructor.
>
> We don't warn about the implicit X constructor because we don't clobber the
> object at the beginning of an implicit constructor, because
> value-initialization zero-initializes the object before calling the implicit
> constructor, and we mustn't clobber that initialization (bug 68006). The
> middle end relies on the clobber to know what's uninitialized, so we don't
> get the warning here.
>
> It would be appropriate to give a maybe-uninitialized warning here, though.
> I don't know how complicated it would be to do that using the existing
> mechanisms.
These case are difficult because they involve exported globals which GCC
thinks are always initialized. For the testcase only the initializer
of x prevails, the constructor of y is discarded before we run the
warning machinery. The initializer of x prevails in
__static_initialization_and_destruction_0 like
_1 = x.x2;
x.x1 = _1;
which has the aforementioned issue. So for a proper testcase we need
calls to the constructors (where we should warn in?) and the constructors
prevail.
Adding
Y y{};
makes Y::Y prevail and as you said we warn about it. IL:
Y::Y (struct Y * const this)
{
int _1;
<bb 2> :
MEM[(struct &)this_3(D)] ={v} {CLOBBER};
_1 = this_3(D)->y2;
this_3(D)->y1 = _1;
this_3(D)->y2 = 0;
return;
so - how do I make X::X used and thus prevail? It looks like it doesn't
really exist and the C++ FE even for
void foo() { X x{}; }
just outputs
;; Function void foo() (null)
;; enabled by -tree-original
{
struct X x = {.x2=0};
<<cleanup_point struct X x = {.x2=0};>>;
<<cleanup_point <<< Unknown tree: expr_stmt
x.x1 = x.x2 >>>>>;
}
which ends up as
foo ()
{
struct X x;
try
{
x = {};
_1 = x.x2;
x.x1 = _1;
}
finally
{
x = {CLOBBER};
}
}
so there is no uninitialized use.
OK, doing void foo() { X x; } shows
X::X (struct X * const this)
{
_1 = this->x2;
this->x1 = _1;
this->x2 = 0;
}
foo ()
{
struct X x;
try
{
X::X (&x);
}
finally
{
x = {CLOBBER};
}
}
warning would need inlining of the constructor which only happens after
the early warning pass, the late one isn't run at -O0 and with optimization
everything of course vanishes.
>From gcc-bugs-return-604144-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 08:49:25 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++/33260] For scope warning despite -ffor-scope
Date: Wed, 09 May 2018 08:49:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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----------------------------------------------------------------------------
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Known to work| |6.1.0
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--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed long time ago, in 6.1.0.
>From gcc-bugs-return-604145-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 08:59:15 2018
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From: "rsandifo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85694] Generation of vectorized AVG (Average) instruction
Date: Wed, 09 May 2018 08:59:00 -0000
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rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
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--- Comment #5 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
We'd identified a similar problem with the corresponding AArch64 instruction.
Hope to get round to this next week.
>From gcc-bugs-return-604146-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 09:16:00 2018
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Subject: [Bug libstdc++/83140] assoc_legendre returns negated value when m is odd
Date: Wed, 09 May 2018 09:16:00 -0000
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Dinkumware also have an implementation of the TR1 special functions.
>From gcc-bugs-return-604147-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 09:36:00 2018
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Subject: [Bug c++/85707] -Wclass-memaccess should excempt safe usage inside of a class and its friends
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The Position type is trivially-copyable, so IMHO shouldn't warn about uses of
memset/memcpy, but I'm not sure what the conditions for the warning are.
>From gcc-bugs-return-604148-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 09:37:09 2018
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Subject: [Bug c++/85707] -Wclass-memaccess should excempt safe usage inside of a class and its friends
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
IMHO classes and their friends should not have any special exemptions, because
undefined behaviour is still undefined behaviour, it doesn't matter who does
it. But in this case I don't think there is any UB.
>From gcc-bugs-return-604149-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 10:12:53 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85707] -Wclass-memaccess should excempt safe usage inside of a class and its friends
Date: Wed, 09 May 2018 10:12:00 -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> ---
Thus confirmed. Trivially copyable classes should not be warned on.
>From gcc-bugs-return-604150-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 10:20:05 2018
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From: "romain.naour at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/85180] Infinite loop in RTL DSE optimizer
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Romain Naour <romain.naour at gmail dot com> changed:
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--- Comment #18 from Romain Naour <romain.naour at gmail dot com> ---
(In reply to Richard Biener from comment #17)
> (In reply to romain.naour from comment #16)
> > Hi,
> >
> > gcc 7.3.0 is affected by this bug but only on microblaze architecture, see
> > [1].
> > Do you plan to backport this patch on gcc 7.x?
> > It is safe to do so without take the risk to break something with other
> > architecture or optimization level?
> >
> > Best regards,
> > Romain
> >
> > [1] http://lists.busybox.net/pipermail/buildroot/2018-April/220156.html
>
> The bug isn't a regression so technically it doesn't qualify. OTOH it
> looks reasonably safe to backport and the bug is annoying. Jakub, would
> you be ok with a backport?
Ping?
>From gcc-bugs-return-604151-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 10:26:15 2018
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Subject: [Bug middle-end/85599] Function need not be evaluated in logical expression
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janus at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=57160
--- Comment #14 from janus at gcc dot gnu.org ---
(In reply to Dominique d'Humieres from comment #10)
> Am I mistaken to read this as being handled by the middle-end?
The short-circuiting is finally handled by the middle end, since the front end
translates .and. into &&. See also comment 6.
Apparently the standard does neither require nor forbid the short-circuiting
(see c.l.f. discussion), but I would argue that it would be a more reasonable
for gfortran to avoid the short-circuiting (by translating to &), at least if
it is not clear whether the function has side effects.
> If yes, the
> situation is discussed in pr57160 comment 1.
Right, this PR is very much related.
> Does it means that 'check' has to be evaluated in
>
> if (flag) flag = check ()
>
> even if flag==.false. ?
No, I'm pretty sure that is not the case.
>From gcc-bugs-return-604152-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 10:33:18 2018
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Subject: [Bug target/85626] [nvptx] __builtin_trap should not return
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--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Wed May 9 10:32:40 2018
New Revision: 260072
URL: https://gcc.gnu.org/viewcvs?rev=260072&root=gcc&view=rev
Log:
[nvptx] Make trap insn noreturn
2018-05-09 Tom de Vries <tom@codesourcery.com>
PR target/85626
* config/nvptx/nvptx.md (define_insn "trap", define_insn
"trap_if_true")
(define_insn "trap_if_false"): Add exit after trap.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/nvptx/nvptx.md
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Subject: [Bug rtl-optimization/85180] Infinite loop in RTL DSE optimizer
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--- Comment #19 from rguenther at suse dot de <rguenther at suse dot de> ---
On Wed, 9 May 2018, romain.naour at gmail dot com wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85180
>
> Romain Naour <romain.naour at gmail dot com> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> CC| |romain.naour at gmail dot com
>
> --- Comment #18 from Romain Naour <romain.naour at gmail dot com> ---
> (In reply to Richard Biener from comment #17)
> > (In reply to romain.naour from comment #16)
> > > Hi,
> > >
> > > gcc 7.3.0 is affected by this bug but only on microblaze architecture, see
> > > [1].
> > > Do you plan to backport this patch on gcc 7.x?
> > > It is safe to do so without take the risk to break something with other
> > > architecture or optimization level?
> > >
> > > Best regards,
> > > Romain
> > >
> > > [1] http://lists.busybox.net/pipermail/buildroot/2018-April/220156.html
> >
> > The bug isn't a regression so technically it doesn't qualify. OTOH it
> > looks reasonably safe to backport and the bug is annoying. Jakub, would
> > you be ok with a backport?
>
> Ping?
Jakub said it doesn't qualify give it's too risky.
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Subject: [Bug target/85626] [nvptx] __builtin_trap should not return
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Tom de Vries <vries at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
Patch committed, marking resolved-fixed.
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Subject: [Bug c/85696] OpenMP with variably modified and default(none) won't compile
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-05-09
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Ever confirmed|0 |1
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 44096
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44096&action=edit
gcc9-pr85696.patch
Untested fix.
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Subject: [Bug ipa/85655] [8/9 Regression] ICE with -flto and -O2 during IPA pass: cp lto1: internal compiler error: Segmentation fault
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r259319.
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Subject: [Bug target/85231] [og7, openacc, nvptx] Too much shared memory claimed for long vector length
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Subject: [Bug tree-optimization/84958] int loads not eliminated against larger stores
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Subject: [Bug lto/85583] [9 Regression] lto1: internal compiler error: in lto_balanced_map, at lto/lto-partition.c:833
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Can't reproduce, can you please provide output --verbose.
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Subject: [Bug rtl-optimization/85645] ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
Date: Wed, 09 May 2018 12:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85645
--- Comment #9 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Wed May 9 12:12:33 2018
New Revision: 260074
URL: https://gcc.gnu.org/viewcvs?rev=260074&root=gcc&view=rev
Log:
regcprop: Avoid REG_CFA_REGISTER notes (PR85645)
Changing a SET that has a REG_CFA_REGISTER note is wrong if we are
changing the SET_DEST, or if the REG_CFA_REGISTER has nil as its
argument, and maybe some other cases. It's never really useful to
propagate into such an instruction, so let's just bail whenever we
see such a note.
PR rtl-optimization/85645
* regcprop.c (copyprop_hardreg_forward_1): Don't propagate into an
insn that has a REG_CFA_REGISTER note.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/regcprop.c
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Subject: [Bug target/85616] ARM target using -O2 may cause unaligned access
Date: Wed, 09 May 2018 12:14:00 -0000
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Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Resolution|FIXED |INVALID
--- Comment #7 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Setting correct closed state.
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Subject: [Bug rtl-optimization/85645] ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
Date: Wed, 09 May 2018 12:16:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85645
--- Comment #10 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Wed May 9 12:14:39 2018
New Revision: 260075
URL: https://gcc.gnu.org/viewcvs?rev=260075&root=gcc&view=rev
Log:
regrename: Don't rename the dest of a REG_CFA_REGISTER (PR85645)
We should never change the destination of a REG_CFA_REGISTER, just
like for insns with a REG_CFA_RESTORE, because we need to have the
same control flow information on all branches that join. It is very
doubtful that renaming the scratch registers used for prologue/epilogue
will help anything either.
PR rtl-optimization/85645
* regrename.c (build_def_use): Also kill the chains that include the
destination of a REG_CFA_REGISTER note.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/regrename.c
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Subject: [Bug lto/85583] [9 Regression] lto1: internal compiler error: in lto_balanced_map, at lto/lto-partition.c:833
Date: Wed, 09 May 2018 12:17:00 -0000
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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> ---
(In reply to Martin Liška from comment #3)
> Can't reproduce, can you please provide output --verbose.
Not needed, I have another test-case that I've been reducing.
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From: "jwyatt at feralinteractive dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85710] New: Enabling memset-elt-size warning causes ICE on memset of template member array
Date: Wed, 09 May 2018 12:29:00 -0000
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Bug ID: 85710
Summary: Enabling memset-elt-size warning causes ICE on memset
of template member array
Product: gcc
Version: 8.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jwyatt at feralinteractive dot com
Target Milestone: ---
The memset-elt-size warning causes an internal compiler error when compiling:
#include <cstring>
template <typename T> struct A { int a; };
template <typename T>
class E
{
public:
void Clear();
private:
A<T> mA[2];
};
template<typename T>
void E<T>::Clear()
{
memset(mA, 0, sizeof(int)*2);
}
It does not cause an ICE if mA is not an array, or is an array of size 1. It
does not cause an ICE if using memset(mA, 0, sizeof(mA)); or memset(&mA[0], 0,
sizeof(int)*2);
The code causes an ICE when compiled with:
g++ -Wmemset-elt-size test.cpp
It does not cause an ICE when compiled with:
g++ -Wall -Wextra -Wno-memset-elt-size
Reproduces in:
g++ (GCC) 8.1.1 20180502 (Red Hat 8.1.1-1)
Configured with: ../gcc-8.1.0/configure
--prefix=/opt/compiler-explorer/gcc-build/staging --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --enable-clocale=gnu --enable-languages=c,c++,fortran
--enable-ld=yes --enable-gold=yes --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-linker-build-id --enable-lto
--enable-plugins --enable-threads=posix --with-pkgversion=GCC-Explorer-Build
Thread model: posix
gcc version 8.1.0 (GCC-Explorer-Build)
Configured with: ../gcc-trunk-20180508/configure
--prefix=/opt/compiler-explorer/gcc-build/staging --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --enable-clocale=gnu --enable-languages=c,c++,fortran
--enable-ld=yes --enable-gold=yes --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-linker-build-id --enable-lto
--enable-plugins --enable-threads=posix --with-pkgversion=GCC-Explorer-Build
Thread model: posix
gcc version 9.0.0 20180508 (experimental) (GCC-Explorer-Build)
Does not reproduce in:
Configured with: ../gcc-7.3.0/configure --prefix /root/staging
--build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
--disable-bootstrap --enable-multiarch --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --enable-clocale=gnu
--enable-languages=c,c++,fortran --enable-ld=yes --enable-gold=yes
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-linker-build-id
--enable-lto --enable-plugins --enable-threads=posix
--with-pkgversion=GCC-Explorer-Build
Thread model: posix
gcc version 7.3.0 (GCC-Explorer-Build)
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Subject: [Bug rtl-optimization/85645] ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
Date: Wed, 09 May 2018 12:49:00 -0000
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--- Comment #11 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Wed May 9 12:48:43 2018
New Revision: 260076
URL: https://gcc.gnu.org/viewcvs?rev=260076&root=gcc&view=rev
Log:
shrink-wrap: Improve spread_components (PR85645)
In the testcase for PR85645 we do a pretty dumb placement of the
prologue/epilogue for the LR component: we place an epilogue for LR
before a control flow split where one of the branches clobbers LR
eventually, and the other does not. The branch that does clobber it
will need a prologue again some time later. Because saving and
restoring LR is a two step process---it needs to be moved via a GPR---
the backend emits CFI directives so that we get correct unwind
information. But both regcprop and regrename do not properly handle
such CFI directives leading to ICEs.
Now, neither of the two branches needs to have LR restored at all,
because both of the branches end up in an infinite loop.
This patch makes spread_component return a boolean saying if anything
was changed, and if so, it is called again. This obviously is finite
(there is a finite number of basic blocks, each with a finite number
of components, and spread_components can only assign more components
to a block, never less). I also instrumented the code, and on a
bootstrap+regtest spread_components made changes a maximum of two
times. Interestingly though it made changes on two iterations in
a third of the cases it did anything at all!
PR rtl-optimization/85645
* shrink-wrap.c (spread_components): Return a boolean saying if
anything was changed.
(try_shrink_wrapping_separate): Iterate spread_components until
nothing changes anymore.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/shrink-wrap.c
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Subject: [Bug rtl-optimization/85645] ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
Date: Wed, 09 May 2018 12:51:00 -0000
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--- Comment #12 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Wed May 9 12:51:00 2018
New Revision: 260077
URL: https://gcc.gnu.org/viewcvs?rev=260077&root=gcc&view=rev
Log:
rs6000: Give an argument to every REG_CFA_REGISTER (PR85645)
The one for the prologue mflr did not have any value set, which means
use the SET that is in the insn pattern. This works fine, except when
some late pass decides to replace the SET_SRC -- this changes the
meaning of the REG_CFA_REGISTER! Such passes should not do these
things, but let's be more explicit here, for extra robustness. It
could be argued that this defaulting is a design misfeature (it does
not save much space either, etc.)
PR rtl-optimization/85645
* config/rs6000/rs6000.c (rs6000_emit_prologue_components): Put a SET
in the REG_CFA_REGISTER note for LR, don't leave it empty.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/rs6000/rs6000.c
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Subject: [Bug rtl-optimization/85645] ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
Date: Wed, 09 May 2018 12:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85645
--- Comment #13 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Fixed on trunk. The comment 9 and comment 10 patches probably should be
backported.
>From gcc-bugs-return-604167-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 12:56:11 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 lto/85583] [9 Regression] lto1: internal compiler error: in lto_balanced_map, at lto/lto-partition.c:833
Date: Wed, 09 May 2018 12:56:00 -0000
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--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Reduced test-case:
$ cat json.ii
class b {
public:
virtual ~b();
};
template <typename> class c : b {};
class B {
c<char> d;
};
extern template class c<char>;
main() { B a; }
$ ./xgcc -B. -flto=8 -O2 -std=gnu++17 json.ii
json.ii:10:6: warning: ISO C++ forbids declaration of ‘main’ with no type
[-Wreturn-type]
main() { B a; }
^
lto1: internal compiler error: in lto_balanced_map, at lto/lto-partition.c:836
0x62014f lto_balanced_map(int, int)
../../gcc/lto/lto-partition.c:836
0x614b2c do_whole_program_analysis
../../gcc/lto/lto.c:3179
0x614b2c lto_main()
../../gcc/lto/lto.c:3374
Honza, can you please fix that?
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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/85699] [9 regression] gcc.dg/nextafter-2.c fail
Date: Wed, 09 May 2018 13:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85699
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
If you are using glibc < 2.24, then maybe this is:
https://sourceware.org/bugzilla/show_bug.cgi?id=20205
>From gcc-bugs-return-604169-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 13:06:31 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 ipa/85607] [9 Regression] ice in add_type, at ipa-icf.c:1583
Date: Wed, 09 May 2018 13:06:00 -0000
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r259772. We should skip incomplete types in ICF. I'm cooking a
patch for that.
>From gcc-bugs-return-604171-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 13:17:23 2018
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Subject: [Bug tree-optimization/85699] [9 regression] gcc.dg/nextafter-2.c fail
Date: Wed, 09 May 2018 13:17:00 -0000
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 44097
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44097&action=edit
gcc9-pr85699.patch
Untested workaround (if we want to workaround libc bugs in the testsuite).
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Subject: [Bug target/85711] New: ICE in aarch64_classify_address, at config/aarch64/aarch64.c:5678
Date: Wed, 09 May 2018 13:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85711
Bug ID: 85711
Summary: ICE in aarch64_classify_address, at
config/aarch64/aarch64.c:5678
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
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Reporter: marxin at gcc dot gnu.org
CC: amker at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-linux-gnu
Target: aarch64-linux-gnu
Following ICEs:
$ aarch64-linux-gnu-gcc
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/torture/pr84682-2.c
asm("" : : "pir"(c));
^~~
0xdeadbeef aarch64_classify_address
.././../gcc/config/aarch64/aarch64.c:5677
0xdeadbeef aarch64_legitimate_address_hook_p
.././../gcc/config/aarch64/aarch64.c:5958
0xdeadbeef memory_address_addr_space_p(machine_mode, rtx_def*, unsigned char)
.././../gcc/recog.c:1334
0xdeadbeef address_operand(rtx_def*, machine_mode)
.././../gcc/recog.c:1073
0xdeadbeef asm_operand_ok(rtx_def*, char const*, char const**)
.././../gcc/recog.c:1816
0xdeadbeef expand_asm_stmt
.././../gcc/cfgexpand.c:3138
0xdeadbeef expand_gimple_stmt_1
.././../gcc/cfgexpand.c:3621
0xdeadbeef expand_gimple_stmt
.././../gcc/cfgexpand.c:3790
0xdeadbeef expand_gimple_basic_block
.././../gcc/cfgexpand.c:5819
0xdeadbeef execute
.././../gcc/cfgexpand.c:6425
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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++/85710] [8/9 Regression] Enabling memset-elt-size warning causes ICE on memset of template member array
Date: Wed, 09 May 2018 13:27:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Status|UNCONFIRMED |NEW
Known to work| |7.3.0
Keywords| |ice-on-valid-code,
| |needs-bisection
Last reconfirmed| |2018-05-09
Ever confirmed|0 |1
Summary|Enabling memset-elt-size |[8/9 Regression] Enabling
|warning causes ICE on |memset-elt-size warning
|memset of template member |causes ICE on memset of
|array |template member array
Target Milestone|--- |8.2
Known to fail| |8.1.0
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
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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/85712] New: [8/9 Regression] ICE in all_phi_incrs_profitable_1 at gcc/gimple-ssa-strength-reduction.c:3479
Date: Wed, 09 May 2018 13:31:00 -0000
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Bug ID: 85712
Summary: [8/9 Regression] ICE in all_phi_incrs_profitable_1 at
gcc/gimple-ssa-strength-reduction.c:3479
Product: gcc
Version: unknown
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Target Milestone: ---
Starting from r251264 we ICE on:
$ ./xgcc -B.
/home/marxin/Programming/gcc/gcc/testsuite/gfortran.dg/whole_file_9.f90 -O3
--param scev-max-expr-size=0 -c
during GIMPLE pass: slsr
/home/marxin/Programming/gcc/gcc/testsuite/gfortran.dg/whole_file_9.f90:8:0:
program test
internal compiler error: Segmentation fault
0xc5b59f crash_signal
../../gcc/toplev.c:325
0x865faa dominated_by_p(cdi_direction, basic_block_def const*, basic_block_def
const*)
../../gcc/dominance.c:1118
0x1464481 all_phi_incrs_profitable_1
../../gcc/gimple-ssa-strength-reduction.c:3479
0x1464aa4 all_phi_incrs_profitable
../../gcc/gimple-ssa-strength-reduction.c:3550
0x1464aa4 replace_profitable_candidates
../../gcc/gimple-ssa-strength-reduction.c:3806
0x14649e3 replace_profitable_candidates
../../gcc/gimple-ssa-strength-reduction.c:3838
0x1468cbc analyze_candidates_and_replace
../../gcc/gimple-ssa-strength-reduction.c:3917
0x1468cbc execute
../../gcc/gimple-ssa-strength-reduction.c:3995
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Subject: [Bug tree-optimization/85712] [8/9 Regression] ICE in all_phi_incrs_profitable_1 at gcc/gimple-ssa-strength-reduction.c:3479
Date: Wed, 09 May 2018 13:32:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-09
Version|unknown |9.0
Ever confirmed|0 |1
>From gcc-bugs-return-604176-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 13:33:10 2018
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From: "ktkachov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85711] ICE in aarch64_classify_address, at config/aarch64/aarch64.c:5678
Date: Wed, 09 May 2018 13:33:00 -0000
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ktkachov at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
CC| |ktkachov at gcc dot gnu.org
--- Comment #1 from ktkachov at gcc dot gnu.org ---
This is awaiting review of Bin's patch
https://gcc.gnu.org/ml/gcc-patches/2018-04/msg01085.html
>From gcc-bugs-return-604177-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 13:37:17 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 target/84332] ICE in insn_default_length, at config/s390/s390.md:9697 for -fstack-clash-protection
Date: Wed, 09 May 2018 13:37:00 -0000
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
May I please ping this..
>From gcc-bugs-return-604178-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 13:47:25 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 c++/85713] New: [9 Regression] ICE in dependent_type_p, at cp/pt.c:24582 on invalid code
Date: Wed, 09 May 2018 13:47:00 -0000
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Bug ID: 85713
Summary: [9 Regression] ICE in dependent_type_p, at
cp/pt.c:24582 on invalid code
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
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Reporter: marxin at gcc dot gnu.org
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Starting from r260050 we ICE on:
$ ./xg++ -B.
/home/marxin/BIG/Programming/llvm/tools/clang/test/CXX/dcl.dcl/dcl.spec/dcl.type/dcl.spec.auto/p3-generic-lambda-1y.cpp
/home/marxin/BIG/Programming/llvm/tools/clang/test/CXX/dcl.dcl/dcl.spec/dcl.type/dcl.spec.auto/p3-generic-lambda-1y.cpp:
In function ‘int main()’:
/home/marxin/BIG/Programming/llvm/tools/clang/test/CXX/dcl.dcl/dcl.spec/dcl.type/dcl.spec.auto/p3-generic-lambda-1y.cpp:37:20:
internal compiler error: in dependent_type_p, at cp/pt.c:24582
) -> int { return v + i + c
^~~
0x83a1ab dependent_type_p(tree_node*)
../../gcc/cp/pt.c:24582
0x6beb68 require_complete_types_for_parms
../../gcc/cp/decl.c:12571
0x6beb68 check_function_type
../../gcc/cp/decl.c:14743
0x6beb68 start_preparsed_function(tree_node*, tree_node*, int)
../../gcc/cp/decl.c:14959
0x728ab4 start_lambda_function(tree_node*, tree_node*)
../../gcc/cp/lambda.c:1393
0x779148 cp_parser_lambda_body
../../gcc/cp/parser.c:10656
0x777d36 cp_parser_lambda_expression
../../gcc/cp/parser.c:10170
0x76d154 cp_parser_primary_expression
../../gcc/cp/parser.c:5263
0x771190 cp_parser_postfix_expression
../../gcc/cp/parser.c:7005
0x7747ae cp_parser_unary_expression
../../gcc/cp/parser.c:8300
0x7758c0 cp_parser_cast_expression
../../gcc/cp/parser.c:9068
0x7759bd cp_parser_binary_expression
../../gcc/cp/parser.c:9169
0x77679a cp_parser_assignment_expression
../../gcc/cp/parser.c:9464
0x776fad cp_parser_constant_expression
../../gcc/cp/parser.c:9748
0x78f225 cp_parser_initializer_clause
../../gcc/cp/parser.c:21927
0x78f043 cp_parser_initializer
../../gcc/cp/parser.c:21867
0x78abe0 cp_parser_init_declarator
../../gcc/cp/parser.c:19678
0x77e300 cp_parser_simple_declaration
../../gcc/cp/parser.c:13038
0x77de43 cp_parser_block_declaration
../../gcc/cp/parser.c:12857
0x77d23d cp_parser_declaration_statement
../../gcc/cp/parser.c:12451
Where the file can be downloaded here:
https://github.com/llvm-mirror/clang/blob/master/test/CXX/dcl.dcl/dcl.spec/dcl.type/dcl.spec.auto/p3-generic-lambda-1y.cpp
>From gcc-bugs-return-604179-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 13:47:48 2018
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Subject: [Bug c++/85713] [9 Regression] ICE in dependent_type_p, at cp/pt.c:24582 on invalid code
Date: Wed, 09 May 2018 13:47:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-invalid-code
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>From gcc-bugs-return-604180-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 13:51:40 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/85712] [8/9 Regression] ICE in all_phi_incrs_profitable_1 at gcc/gimple-ssa-strength-reduction.c:3479
Date: Wed, 09 May 2018 13:51:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
CC| |wschmidt at gcc dot gnu.org
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think we've been here before. stmt_cand_map gets stale somehow. Oh, it's
actually basis->cand_stmt that is no longer in the IL. It gets replaced by
replace_one_candidate:
#0 gsi_replace (gsi=0x7fffffffd5b0, stmt=<gimple_assign 0x7ffff669db90>,
update_eh_info=false)
at /space/rguenther/src/gcc-slpcost/gcc/gimple-iterator.c:428
#1 0x0000000001ca03e7 in replace_one_candidate (c=0x2dcd280, i=0,
basis_name=<ssa_name 0x7ffff66965a0>)
at
/space/rguenther/src/gcc-slpcost/gcc/gimple-ssa-strength-reduction.c:3741
#2 0x0000000001ca074b in replace_profitable_candidates (c=0x2dcd280)
at
/space/rguenther/src/gcc-slpcost/gcc/gimple-ssa-strength-reduction.c:3829
#3 0x0000000001ca09d9 in analyze_candidates_and_replace ()
at
/space/rguenther/src/gcc-slpcost/gcc/gimple-ssa-strength-reduction.c:3917
#4 0x0000000001ca0bd0 in (anonymous
namespace)::pass_strength_reduction::execute (this=0x2cf1490,
fun=0x7ffff6a5c160)
at
/space/rguenther/src/gcc-slpcost/gcc/gimple-ssa-strength-reduction.c:3995
I suppose
gsi_replace (&gsi, copy_stmt, false);
c->cand_stmt = copy_stmt;
^^^
this is supposed to fix it up. But we fixup only this and following
(next_interp) candidates - but this one has "previous" ones.
52 [24] _99 = S.17_130 * iftmp.23_30;
MULT : (S.17_130 + 0) * iftmp.23_30 : integer(kind=8)
basis: 49 dependent: 63 sibling: 0
next-interp: 53 dead-savings: 0
53 [24] _99 = S.17_130 * iftmp.23_30;
MULT : (iftmp.23_30 + 0) * S.17_130 : integer(kind=8)
basis: 48 dependent: 0 sibling: 0
next-interp: 0 dead-savings: 0
Bill?
>From gcc-bugs-return-604181-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 13:53:31 2018
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libgomp/83792] [openacc] Factor out async argument utility functions
Date: Wed, 09 May 2018 13:53:00 -0000
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--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Wed May 9 13:52:49 2018
New Revision: 260081
URL: https://gcc.gnu.org/viewcvs?rev=260081&root=gcc&view=rev
Log:
[openacc] Factor out async argument utility functions
2018-05-09 Tom de Vries <tom@codesourcery.com>
PR libgomp/83792
* oacc-int.h (async_valid_stream_id_p, async_valid_p)
(async_synchronous_p): New function.
* oacc-async.c (acc_async_test, acc_wait, acc_wait_all_async): Use
async_valid_p.
* oacc-cuda.c (acc_get_cuda_stream, acc_set_cuda_stream): Use
async_valid_stream_id_p.
* oacc-mem.c (gomp_acc_remove_pointer): Use async_synchronous_p.
* oacc-parallel.c (GOACC_parallel_keyed): Same.
Modified:
trunk/libgomp/ChangeLog
trunk/libgomp/oacc-async.c
trunk/libgomp/oacc-cuda.c
trunk/libgomp/oacc-int.h
trunk/libgomp/oacc-mem.c
trunk/libgomp/oacc-parallel.c
>From gcc-bugs-return-604182-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 13:56:27 2018
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Subject: [Bug libgomp/83792] [openacc] Factor out async argument utility functions
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Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
Patch committed, marking resolved-fixed.
>From gcc-bugs-return-604183-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 13:59:03 2018
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From: "thomas.otto@pdv-fs.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85714] New: -Wimplicit-fallthrough and nested exhaustive switch statements with enum classes and return
Date: Wed, 09 May 2018 13:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85714
Bug ID: 85714
Summary: -Wimplicit-fallthrough and nested exhaustive switch
statements with enum classes and return
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: thomas.otto@pdv-fs.de
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Nesting enum class switch statements which are exhaustive and whose cases all
return produces a false positive -Werror=implicit-fallthrough warning:
$ ~/gcc/8.1.0/bin/g++ -Wall -Wextra -c switch_fallthrough.cpp -Werror
switch_fallthrough.cpp: In function 'int example(Foo, Bar)':
switch_fallthrough.cpp:8:7: error: this statement may fall through
[-Werror=implicit-fallthrough=]
switch(b) {
^~~~~~
switch_fallthrough.cpp:13:5: note: here
case Foo::E2:
^~~~
Uncommenting the [[fallthrough]]; fixes this, but should not be required since
no fallthrough can happen.
Related, the last return -1 in the function should not be required since the
outer switch is also exhaustive.
enum class Foo { E1, E2 };
enum class Bar { A, B };
int example(Foo f, Bar b)
{
switch(f) {
case Foo::E1:
switch(b) {
case Bar::A: return 1;
case Bar::B: return 2;
}
/// [[fallthrough]]; // -Wimplicit-fallthrough -- new in gcc 8.1
case Foo::E2:
switch(b) {
case Bar::A: return 3;
case Bar::B: return 4;
}
}
return -1; // -Wreturn-type -- already in gcc 7.3, should not be required
}
>From gcc-bugs-return-604184-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 14:01:17 2018
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Subject: [Bug libgomp/83792] [openacc] Factor out async argument utility functions
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Tom de Vries <vries at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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>From gcc-bugs-return-604185-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 14:02:28 2018
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From: "thomas.otto@pdv-fs.de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85714] -Wimplicit-fallthrough and nested exhaustive switch statements with enum classes and return
Date: Wed, 09 May 2018 14:02:00 -0000
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--- Comment #1 from Thomas Otto <thomas.otto@pdv-fs.de> ---
Created attachment 44098
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44098&action=edit
-Werror=implicit-fallthrough false positive demo
>From gcc-bugs-return-604186-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 14:04:31 2018
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From: "wschmidt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85712] [8/9 Regression] ICE in all_phi_incrs_profitable_1 at gcc/gimple-ssa-strength-reduction.c:3479
Date: Wed, 09 May 2018 14:04:00 -0000
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Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |wschmidt at gcc dot gnu.org
--- Comment #2 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
I'll take a look. FYI, I will be traveling over the next week or so, so it may
be later in the month before I can get this sorted out. Thanks for the
heads-up!
>From gcc-bugs-return-604187-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 14:42:46 2018
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From: "daffra.claudio at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/59832] [c++11] ICE in reshape_init_class with initializer list
Date: Wed, 09 May 2018 14:42:00 -0000
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claudio daffra <daffra.claudio at gmail dot com> changed:
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----------------------------------------------------------------------------
CC| |daffra.claudio at gmail dot com
--- Comment #14 from claudio daffra <daffra.claudio at gmail dot com> ---
internal compiler error: in reshape_init_class
I have reproduce this error in source code below
C:\prj\cd>g++ src\prova.cpp -o prova.exe -std=c++14
src\prova.cpp: In function 'int main()':
src\prova.cpp:24:5: internal compiler error: in reshape_init_class, at
cp/decl.c:5484
t1 = { 1,"tok",{ .real=3.4 } ,1,2} ;
^
libbacktrace could not find executable to open
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://sourceforge.net/projects/mingw-w64> for instructions.
C:\prj\cd>
#include <iostream>
#include <string>
#include <stdio.h>
#include <stdint.h>
typedef struct token_s
{
uint8_t sym ;
std::string tok ;
union {
uint64_t integer ;
double real;
} ;
uint32_t row ;
uint32_t col ;
} token_t ;
int main ( void )
{
token_t t1 ;
t1 = { 1,"tok",{ .real=3.4 } ,1,2} ;
wprintf ( L"%d %s %d %d
%d\n",t1.sym,t1.tok.c_str(),t1.integer,t1.row,t1.col ) ;
return 0 ;
}
>From gcc-bugs-return-604188-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 14:48:59 2018
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From: "daffra.claudio at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85715] New: internal compiler error: in reshape_init_class ( in anonymous union )
Date: Wed, 09 May 2018 14:48:00 -0000
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Bug ID: 85715
Summary: internal compiler error: in reshape_init_class ( in
anonymous union )
Product: gcc
Version: 5.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Reporter: daffra.claudio at gmail dot com
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Created attachment 44099
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44099&action=edit
error source code to reproduce it
internal compiler error: in reshape_init_class
I have reproduce this error in source code below
C:\prj\cd>g++ src\prova.cpp -o prova.exe -std=c++14
src\prova.cpp: In function 'int main()':
src\prova.cpp:24:5: internal compiler error: in reshape_init_class, at
cp/decl.c:5484
t1 = { 1,"tok",{ .real=3.4 } ,1,2} ;
^
libbacktrace could not find executable to open
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://sourceforge.net/projects/mingw-w64> for instructions.
C:\prj\cd>
similar error : https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59832
#include <iostream>
#include <string>
#include <stdio.h>
#include <stdint.h>
typedef struct token_s
{
uint8_t sym ;
std::string tok ;
union {
uint64_t integer ;
double real;
} ;
uint32_t row ;
uint32_t col ;
} token_t ;
int main ( void )
{
token_t t1 ;
t1 = { 1,"tok",{ .real=3.4 } ,1,2} ;
wprintf ( L"%d %s %d %d
%d\n",t1.sym,t1.tok.c_str(),t1.integer,t1.row,t1.col ) ;
return 0 ;
}
C:\prj\cd>g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=C:/Qt/Qt5.10.1/Tools/mingw530_32/bin/../libexec/gcc/i686-w64-mingw32/5.3.0/lto-wrapper.exe
Target: i686-w64-mingw32
Configured with: ../../../src/gcc-5.3.0/configure --host=i686-w64-mingw32
--build=i686-w64-mingw32 --target=i686-w64-mingw32 --prefix=/mingw32
--with-sysroot=/c/mingw530/i686-530-posix-dwarf-rt_v4-rev0/mingw32
--with-gxx-include-dir=/mingw32/i686-w64-mingw32/include/c++ --enable-shared
--enable-static --disable-multilib --enable-languages=c,c++,fortran,lto
--enable-libstdcxx-time=yes --enable-threads=posix --enable-libgomp
--enable-libatomic --enable-lto --enable-graphite --enable-checking=release
--enable-fully-dynamic-string --enable-version-specific-runtime-libs
--disable-sjlj-exceptions --with-dwarf2 --disable-isl-version-check
--disable-libstdcxx-pch --disable-libstdcxx-debug --enable-bootstrap
--disable-rpath --disable-win32-registry --disable-nls --disable-werror
--disable-symvers --with-gnu-as --with-gnu-ld --with-arch=i686
--with-tune=generic --with-libiconv --with-system-zlib
--with-gmp=/c/mingw530/prerequisites/i686-w64-mingw32-static
--with-mpfr=/c/mingw530/prerequisites/i686-w64-mingw32-static
--with-mpc=/c/mingw530/prerequisites/i686-w64-mingw32-static
--with-isl=/c/mingw530/prerequisites/i686-w64-mingw32-static
--with-pkgversion='i686-posix-dwarf-rev0, Built by MinGW-W64 project'
--with-bugurl=http://sourceforge.net/projects/mingw-w64 CFLAGS='-O2 -pipe
-I/c/mingw530/i686-530-posix-dwarf-rt_v4-rev0/mingw32/opt/include
-I/c/mingw530/prerequisites/i686-zlib-static/include
-I/c/mingw530/prerequisites/i686-w64-mingw32-static/include' CXXFLAGS='-O2
-pipe -I/c/mingw530/i686-530-posix-dwarf-rt_v4-rev0/mingw32/opt/include
-I/c/mingw530/prerequisites/i686-zlib-static/include
-I/c/mingw530/prerequisites/i686-w64-mingw32-static/include' CPPFLAGS=
LDFLAGS='-pipe -L/c/mingw530/i686-530-posix-dwarf-rt_v4-rev0/mingw32/opt/lib
-L/c/mingw530/prerequisites/i686-zlib-static/lib
-L/c/mingw530/prerequisites/i686-w64-mingw32-static/lib
-Wl,--large-address-aware'
Thread model: posix
gcc version 5.3.0 (i686-posix-dwarf-rev0, Built by MinGW-W64 project)
C:\prj\cd>
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Subject: [Bug c++/19808] miss a warning about uninitialized member usage in member initializer list in constructor
Date: Wed, 09 May 2018 14:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19808
--- Comment #40 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #39)
> so - how do I make X::X used and thus prevail? It looks like it doesn't
> really exist
True, for C++14 and up, "X x{};" does aggregate initialization rather than
calling the constructor. We ought to warn about this at function scope, but we
clear the object first, so it isn't actually uninitialized.
As you found, removing the {} makes it use the constructor.
> OK, doing void foo() { X x; } shows
>
> X::X (struct X * const this)
> {
> _1 = this->x2;
> this->x1 = _1;
> this->x2 = 0;
> }
>
> foo ()
> {
> struct X x;
>
> try
> {
> X::X (&x);
> }
> finally
> {
> x = {CLOBBER};
> }
> }
>
> warning would need inlining of the constructor which only happens after
> the early warning pass, the late one isn't run at -O0 and with optimization
> everything of course vanishes.
I was wondering about a maybe-uninitialized warning for the constructor without
considering where it's called from; even if a particular object is
zero-initialized when we enter the implicit constructor, the constructor
shouldn't rely on that. Basically, warn as if there were a clobber, without
there actually being one.
>From gcc-bugs-return-604190-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 15:01:57 2018
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Subject: [Bug c++/19808] miss a warning about uninitialized member usage in member initializer list in constructor
Date: Wed, 09 May 2018 15:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19808
--- Comment #41 from Manuel López-Ibáñez <lopezibanez at gmail dot com> ---
All these cases can be handled perfectly by the FE and there's a patch
above.
Why complicate it by expecting the ME to understand C++ mem-initializer
semantics?
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/85716] New: No easy way for end-user to tell what GCC is doing when compilation is slow
Date: Wed, 09 May 2018 15:14:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85716
Bug ID: 85716
Summary: No easy way for end-user to tell what GCC is doing
when compilation is slow
Product: gcc
Version: unknown
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From #gcc on freenode:
<PlasmaHH_> Hi, I just refactored some of my code and now gcc won't finish
compiling and grows in memory size (18gig so far after 30 minutes) and I would
like to know what it is doing there. Likely something is going on with some
template instantiations or so, is there any sane debugging option that will
tell what it does on a somewhat high level while going along?
* PlasmaHH_ is now known as PlasmaHH
<dmalcolm> PlasmaHH: -ftime-report would probably be the first thing to try
<PlasmaHH> dmalcolm: those seem to output only something after they are done,
which doesn't seem to finish. at least it doesn't output anything here.
<dmalcolm> hmmm
<dmalcolm> maybe -Q then
<PlasmaHH> dmalcolm: I was afraid you come up with that, its tons of
information and all on one line ^^ which is why I was looking for a somewhat
abstract level... but guess there isn't much then...
<dmalcolm> PlasmaHH: maybe there is something, and I'm just not thinking of it.
Seems to me like a valid thing to be able to "ask the compiler" about.
<PlasmaHH> dmalcolm: maybe that giant amount of (to me) unreadable output of -Q
is just a consequence of something going wrong...
<dmalcolm> PlasmaHH: if there were linebreaks, would it be more readable?
<dmalcolm> (my job is improving GCC usability, so it's a serious question)
<PlasmaHH> dmalcolm: definetly. since it seems to output every function... I
tried to split on ) but thats not too good for when there is a ) in the
function signature or so
<dmalcolm> PlasmaHH: I think I'll open a BZ about this for GCC 9; it seems like
there's room for improvement here
<PlasmaHH> most of the part (where things get wrong) seem to be really weird,
probably functors being passed to functors ad inf. so if they were on one line
I could much easier see that its indeed one big functor, at the moment its just
a big mess :/
<PlasmaHH> taking things apart a bit the signature of one function is so far
mentioned 184049 times in that -Q dump, possibly at various recursion
depths....
<PlasmaHH> that doesnt sound good
<dmalcolm> perhaps a infinite recursion bug, or perhaps some kind of
exponential template expansion?
As noted above, I'm capturing this in BZ as it seems like there's room for
improvement here.
Am I missing something, or is there no "easy" way (for some definition of
"easy") for an end-user to track what GCC is doing during a very long compile?
Some "brainstorm"-ish ideas:
Should -Q add newlines?
Maybe with timestamps?
Maybe a option to have some kind of timestamp-based logging, emitting a series
of lines of the form:
[TIMESTAMP] Doing something
perhaps piggy-backing off of the timevar hooks, so that if something within GCC
goes off into the weeds, the user can see e.g. which function it's having
trouble with.
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Subject: [Bug other/85716] No easy way for end-user to tell what GCC is doing when compilation is slow
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug tree-optimization/85699] [9 regression] gcc.dg/nextafter-2.c fail
Date: Wed, 09 May 2018 15:16:00 -0000
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--- Comment #4 from Andrey Guskov <andrey.y.guskov at intel dot com> ---
Jakub, here is the requested output:
bug at 136 aa == -3.36210314311209350626267781732175260e-4932L / 4.0L +
3.64519953188247460252840593361941982e-4951L
bug at 145 aa == -3.36210314311209350626267781732175260e-4932L / 4.0L +
3.64519953188247460252840593361941982e-4951L
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Subject: [Bug c++/85717] New: anonymous union in initializer list : do not handle the types correctly
Date: Wed, 09 May 2018 15:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85717
Bug ID: 85717
Summary: anonymous union in initializer list : do not handle
the types correctly
Product: gcc
Version: 5.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
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Created attachment 44100
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44100&action=edit
anonymous union in initializer list : do not handle the types correctly
anonymous union in initializer list : do not handle the types correctly
when i use initializer list in anonyumouse union, g++ gives this error code
more or less i expected;
C:\prj\cd>g++ src\prova.cpp -o prova.exe -std=c++14
src\prova.cpp: In function 'int main()':
src\prova.cpp:31:5: error: narrowing conversion of
'3.3999999999999999e+0' from 'double' to 'uint64_t {aka long long unsigned
int}' inside { } [-Wnarrowing]
t1 = { 1 ,"a",3.4 } ;
^
indeed in a normal way, code below all works o perfectly
t1.real = 6.6 ;
std::cout << t1.real << "\n" ;
t1.integer = 3 ;
std::cout << t1.integer << "\n" ;
despite result change if i swith union member
union {
uint64_t integer ;
double real;
} ;
i put
union {
double real;
uint64_t integer ;
} ;
source code error
#include <iostream>
#include <string>
#include <stdio.h>
#include <stdint.h>
#include <assert.h>
typedef struct token_s
{
uint8_t sym ;
std::string tok ;
union {
double real;
uint64_t integer ;
} ;
} token_t ;
int main ( void )
{
assert ( sizeof(uint64_t)==sizeof(double) ) ;
token_t t1 ;
t1.real = 6.6 ;
std::cout << t1.real << "\n" ;
t1.integer = 3 ;
std::cout << t1.integer << "\n" ;
t1 = { 1 ,"a",3.4 } ;
std::cout << t1.real << "\n" ;
t1 = { 1 ,"a",2 } ;
std::cout << t1.integer << "\n" ;
return 0 ;
}
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85707] -Wclass-memaccess should excempt safe usage inside of a class and its friends
Date: Wed, 09 May 2018 15:29:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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--- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> ---
In the test case, the warning is intended because the access in
HashTable::init_table_memset() bypasses the constructor of the Position class.
If the constructor had other side-effects (e.g., count the number of objects of
the class) bypassing it could violate the invariant (see the example below).
Detecting this sort of a problem is one the design goals of the warning.
To avoid the warning either cast the argument to void* or access the array via
the address of the Position::index member of the first element of the table_
array:
memset (&table_->index, 0xff, sizeof(Position) * _buckets);
Alternatively, suppress the warning via #pragma GCC diagnostic.
$ cat pr85707.C && gcc -O2 -S -Wall pr85707.C
struct S
{
static int count;
int i;
S () {
++count;
__builtin_memset (this, 0, sizeof *this);
}
~S () { --count; }
void f () { __builtin_memset (this, 0, sizeof *this); } // no warning (see
pr84850)
void g (S *p) {
__builtin_memset (p, 0, sizeof *p); // -Wclass-memaccess
}
};
pr85707.C: In member function ‘void S::g(S*)’:
pr85707.C:17:38: warning: ‘void* __builtin_memset(void*, int, long unsigned
int)’ clearing an object of non-trivial type ‘struct S’; use assignment or
value-initialization instead [-Wclass-memaccess]
__builtin_memset (p, 0, sizeof *p); // -Wclass-memaccess
^
pr85707.C:1:8: note: ‘struct S’ declared here
struct S
^
As a side note, in the solution added for pr84850, -Wclass-memaccess was
relaxed to avoid triggering for raw memory accesses to *this in non-static
member functions of non-nontrivial classes with no non-trivial members. It was
a deliberate decision to avoid applying the solution to accesses to objects
other than *this.
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug other/85716] No easy way for end-user to tell what GCC is doing when compilation is slow
Date: Wed, 09 May 2018 15:31:00 -0000
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--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Another idea: maybe reuse the hierarchical logging support from libgccjit?
(possibly with an option to add timestamps or somesuch).
See:
https://gcc.gnu.org/onlinedocs/jit/internals/index.html#example-of-log-file
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Subject: [Bug other/85716] No easy way for end-user to tell what GCC is doing when compilation is slow
Date: Wed, 09 May 2018 15:32:00 -0000
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--- Comment #2 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
(or indeed, showing GGC usage)
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From: "roliver at roku dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85718] New: Incorrect name mangling for va_list on mipsel
Date: Wed, 09 May 2018 16:00:00 -0000
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Bug ID: 85718
Summary: Incorrect name mangling for va_list on mipsel
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: roliver at roku dot com
Target Milestone: ---
--------------------
#include <stdarg.h>
extern void log(char const* fmt, ...);
extern void log(char const* fmt, va_list args);
int main() {
int i = 5;
log("Location of i: %p", &i);
return 0;
}
--------------------
On mipsel, 'log(char const* fmt, va_list args)' is incorrectly mangled to
_Z3logPKcPv rather than _Z3logPKcSt9__va_list which is used on other platforms.
In the above example, code is incorrectly generated to call _Z3logPKcPv on
mipsel whereas the correct code to call _Z3logPKcz is generated on other
platforms. (i.e. the generated code attempts to call the 'va_list'
implementation rather than '...').
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Subject: [Bug libgomp/82901] GOACC_declare calls GOACC_enter_exit_data with async arg 0
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--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Wed May 9 16:01:30 2018
New Revision: 260085
URL: https://gcc.gnu.org/viewcvs?rev=260085&root=gcc&view=rev
Log:
[openacc, libgomp] Use GOMP_ASYNC_SYNC in GOACC_declare
2018-05-09 Tom de Vries <tom@codesourcery.com>
PR libgomp/82901
* oacc-parallel.c (GOACC_declare): Use GOMP_ASYNC_SYNC as async
argument
to GOACC_enter_exit_data.
Modified:
trunk/libgomp/ChangeLog
trunk/libgomp/oacc-parallel.c
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Subject: [Bug libgomp/82901] GOACC_declare calls GOACC_enter_exit_data with async arg 0
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Tom de Vries <vries at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
marking resolved-fixed.
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Subject: [Bug c++/85707] -Wclass-memaccess should excempt safe usage inside of a class and its friends
Date: Wed, 09 May 2018 16:04:00 -0000
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--- Comment #8 from Mathias Stearn <redbeard0531 at gmail dot com> ---
> If the constructor had other side-effects (e.g., count
> the number of objects of the class) bypassing it could
> violate the invariant.
I thought one of the points of friendship was to allow friends to violate a
class's invariants temporarily as long as they promise that the class is left
in a valid state in the end. Since presumably a class and its friends are
maintained by the same people, they are aware of what the actual requirements
of the class are, even if they can't be stated precisely in the language today.
>From gcc-bugs-return-604202-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 16:10:32 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++/85713] [9 Regression] ICE in dependent_type_p, at cp/pt.c:24582 on invalid code
Date: Wed, 09 May 2018 16:10:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC|paolo.carlini at oracle dot com |
Assignee|unassigned at gcc dot gnu.org |paolo.carlini at oracle dot com
--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Too bad. Anyway, c++/84588 is just a minor error-recovery issue, thus for now
I'm simply reverting the commit.
>From gcc-bugs-return-604203-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 16:13:58 2018
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Subject: [Bug lto/83201] [7/8 Regression] SPEC CPU2017 505.mcf_r produces incorrect output when built with -flto and FDO
Date: Wed, 09 May 2018 16:13:00 -0000
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john henning <mailboxnotfound at yahoo dot com> changed:
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----------------------------------------------------------------------------
CC| |mailboxnotfound at yahoo dot com
--- Comment #21 from john henning <mailboxnotfound at yahoo dot com> ---
Comments from SPEC CPU Documentation Guy:
As described at
https://www.spec.org/cpu2017/Docs/faq.html#Miscompare.07
https://www.spec.org/cpu2017/Docs/benchmarks/505.mcf_r.html#Portability
SPEC's recommendation is to use
-fno-strict-aliasing
The patch attached to this bug is not approved by SPEC.
SPEC generally does not change benchmarks after release (no moving targets);
more detail is at the above links.
John Henning
SPEC CPU Subcommittee Secretary
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Subject: [Bug c++/84588] [8 Regression] internal compiler error: Segmentation fault (contains_struct_check())
Date: Wed, 09 May 2018 16:18:00 -0000
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--- Comment #8 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Wed May 9 16:17:36 2018
New Revision: 260086
URL: https://gcc.gnu.org/viewcvs?rev=260086&root=gcc&view=rev
Log:
/cp
2018-05-09 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/85713
Revert:
2018-05-08 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84588
* parser.c (cp_parser_parameter_declaration_list): When the
entire parameter-declaration-list is erroneous maybe call
abort_fully_implicit_template.
/testsuite
2018-05-09 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/85713
Revert:
2018-05-08 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84588
* g++.dg/cpp1y/pr84588.C: New.
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/parser.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/cpp1y/pr84588.C
>From gcc-bugs-return-604204-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 16:18:13 2018
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From: "luke at diamand dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85718] Incorrect name mangling for va_list on mipsel
Date: Wed, 09 May 2018 16:18:00 -0000
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luke at diamand dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |luke at diamand dot org
--- Comment #1 from luke at diamand dot org ---
You can also see the problem with this code:
--------------------
#include <stdarg.h>
void log(char const *fmt, void *foo)
{
}
void log(char const *fmt, va_list args)
{
}
--------------------
With the v8 compiler I get this:
mipsel-linux-gnu-g++-8 -std=c++14 -Wall -c bar.cpp
bar.cpp:8:6: error: redefinition of ‘void log(const char*, va_list)’
void log(char const *fmt, va_list args)
^~~
bar.cpp:4:6: note: ‘void log(const char*, void*)’ previously defined here
void log(char const *fmt, void *foo)
^~~
With a non-MIPS compiler it compiles just fine.
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From: "paolo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85713] [9 Regression] ICE in dependent_type_p, at cp/pt.c:24582 on invalid code
Date: Wed, 09 May 2018 16:18:00 -0000
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--- Comment #2 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Wed May 9 16:17:36 2018
New Revision: 260086
URL: https://gcc.gnu.org/viewcvs?rev=260086&root=gcc&view=rev
Log:
/cp
2018-05-09 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/85713
Revert:
2018-05-08 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84588
* parser.c (cp_parser_parameter_declaration_list): When the
entire parameter-declaration-list is erroneous maybe call
abort_fully_implicit_template.
/testsuite
2018-05-09 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/85713
Revert:
2018-05-08 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84588
* g++.dg/cpp1y/pr84588.C: New.
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/parser.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/cpp1y/pr84588.C
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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++/85713] [9 Regression] ICE in dependent_type_p, at cp/pt.c:24582 on invalid code
Date: Wed, 09 May 2018 16:19:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Assignee|paolo.carlini at oracle dot com |unassigned at gcc dot gnu.org
Target Milestone|--- |9.0
--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Done.
>From gcc-bugs-return-604208-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 16:19:48 2018
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From: "paolo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85713] [9 Regression] ICE in dependent_type_p, at cp/pt.c:24582 on invalid code
Date: Wed, 09 May 2018 16:19:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Assignee|paolo.carlini at oracle dot com |unassigned at gcc dot gnu.org
Target Milestone|--- |9.0
paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |ASSIGNED
Resolution|FIXED |---
Assignee|unassigned at gcc dot gnu.org |paolo.carlini at oracle dot com
Target Milestone|9.0 |---
--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Done.
--- Comment #4 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Wed May 9 16:19:09 2018
New Revision: 260087
URL: https://gcc.gnu.org/viewcvs?rev=260087&root=gcc&view=rev
Log:
/cp
2018-05-09 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/85713
Revert:
2018-05-08 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84588
* parser.c (cp_parser_parameter_declaration_list): When the
entire parameter-declaration-list is erroneous maybe call
abort_fully_implicit_template.
/testsuite
2018-05-09 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/85713
Revert:
2018-05-08 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84588
* g++.dg/cpp1y/pr84588.C: New.
Removed:
trunk/gcc/testsuite/g++.dg/cpp1y/pr84588.C
>From gcc-bugs-return-604209-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 16:19:48 2018
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Subject: [Bug c++/84588] [8 Regression] internal compiler error: Segmentation fault (contains_struct_check())
Date: Wed, 09 May 2018 16:19:00 -0000
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--- Comment #9 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Wed May 9 16:19:09 2018
New Revision: 260087
URL: https://gcc.gnu.org/viewcvs?rev=260087&root=gcc&view=rev
Log:
/cp
2018-05-09 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/85713
Revert:
2018-05-08 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84588
* parser.c (cp_parser_parameter_declaration_list): When the
entire parameter-declaration-list is erroneous maybe call
abort_fully_implicit_template.
/testsuite
2018-05-09 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/85713
Revert:
2018-05-08 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84588
* g++.dg/cpp1y/pr84588.C: New.
Removed:
trunk/gcc/testsuite/g++.dg/cpp1y/pr84588.C
>From gcc-bugs-return-604210-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 16:21:42 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++/84588] [8/9 Regression] internal compiler error: Segmentation fault (contains_struct_check())
Date: Wed, 09 May 2018 16:21:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[8 Regression] internal |[8/9 Regression] internal
|compiler error: |compiler error:
|Segmentation fault |Segmentation fault
|(contains_struct_check()) |(contains_struct_check())
--- Comment #10 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Reverted for now the fix, caused c++/85713.
>From gcc-bugs-return-604211-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 16:25:41 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++/85718] Incorrect name mangling for va_list on mipsel
Date: Wed, 09 May 2018 16:25:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-05-09
Ever confirmed|0 |1
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
That suggests that va_list is void* for MIPS, which is a valid implementation
because the type of va_list is unspecified. Assuming that va_list will be the
same type across all targets (and therefore that functions taking va_list will
always have the same mangled name) is a bad assumption.
But we need preprocessed source as requested by https://gcc.gnu.org/bugs/
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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++/85713] [9 Regression] ICE in dependent_type_p, at cp/pt.c:24582 on invalid code
Date: Wed, 09 May 2018 16:27:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
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--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
.
>From gcc-bugs-return-604213-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 16:43:20 2018
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Subject: [Bug target/85718] Incorrect name mangling for va_list on mipsel
Date: Wed, 09 May 2018 16:43:00 -0000
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--- Comment #3 from Andreas Schwab <schwab@linux-m68k.org> ---
See gcc/config/mips/mips.c:mips_build_builtin_va_list. va_list is a simple
void* unless compiling for EABI.
>From gcc-bugs-return-604214-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 16:53:07 2018
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Subject: [Bug target/85718] Incorrect name mangling for va_list on mipsel
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
So then this behaviour is correct and working as intended.
>From gcc-bugs-return-604215-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 17:30:57 2018
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Subject: [Bug target/85719] New: Unclear docs for AVR io attribute
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Bug ID: 85719
Summary: Unclear docs for AVR io attribute
Product: gcc
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Target: avr-*-*
https://gcc.gnu.org/onlinedocs/gcc/AVR-Variable-Attributes.html#index-io-variable-attribute_002c-AVR
says
"The address specified in the address in the data address range."
What is this supposed to mean? Is it stating a requirement that users must
meet?
Also the grammar in the next paragraph should be fixed:
"Otherwise, the variable it is not assigned an address,"
>From gcc-bugs-return-604216-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 17:48:58 2018
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Subject: [Bug middle-end/85599] Function need not be evaluated in logical expression
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--- Comment #15 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Wed, May 09, 2018 at 10:25:59AM +0000, janus at gcc dot gnu.org wrote:
>
> --- Comment #14 from janus at gcc dot gnu.org ---
> (In reply to Dominique d'Humieres from comment #10)
> > Am I mistaken to read this as being handled by the middle-end?
>
> The short-circuiting is finally handled by the middle end, since the front end
> translates .and. into &&. See also comment 6.
>
> Apparently the standard does neither require nor forbid the short-circuiting
> (see c.l.f. discussion), but I would argue that it would be a more reasonable
> for gfortran to avoid the short-circuiting (by translating to &), at least if
> it is not clear whether the function has side effects.
>
To be clear.
1) Are you proposing that .AND. should be special-cased to
force evaluation of both operands?
2) Are you proposing that the operands in rational expressions
must be evaluated?
3) Are you proposing that the operands for all operators must
be evaluated?
If the answer to any of the above is 'yes', then add a new
option -fno-short-circuit and implement it to transform
result = op1 binop op2
into
tmp1 = op1
tmp2 = op2
result = tmp1 BINOP tmp2
where BINOP differs from binop in that it knows tmp1 and tmp2
have been evaluated. To be completely symmetric, you'll need
a similar treatment for unary operators. That is
result = unop op1
becomes
tmp1 = op1
result = UNOP tmp1
The flow of the compiler would then be
parse code
if (no short circuit) then
walk expression trees forcing evaulation of all operands
else
front optimize pass (walk expression trees)
end if
Give everything to middle-end
Seems like a good method to pessimize performance.
>From gcc-bugs-return-604217-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 18:00:47 2018
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Subject: [Bug c/82967] "did you mean" suggestions are way too suggestive
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--- Comment #3 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Another example:
ia3230612.c:4:41: error: '__i386__' undeclared here (not in a function); did
you mean '__DATE__'?
&& sizeof (long) == 4 ? 1 : -1] = { __i386__ };
^~~~~~~~
__DATE__
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Subject: [Bug c/82967] "did you mean" suggestions are way too suggestive
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=69968
--- Comment #4 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Note that this could well interact with PR 69968 (use of Damerau-Levenshtein,
rather than Levenshtein for edit distance): allowing transpositions will make
some distances shorter.
For the __i386__ vs __DATE__ case, maybe we should detect leading/trailing
underscores and ignore them when computing if the edit distance is reasonable.
It's an edit distance of 4 (4 substitutions) on a length of 8, but perhaps the
effective length should be 4 (ignoring the underscores)?
>From gcc-bugs-return-604219-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 18:08:14 2018
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Subject: [Bug c++/85707] -Wclass-memaccess should excempt safe usage inside of a class and its friends
Date: Wed, 09 May 2018 18:08:00 -0000
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--- Comment #9 from Martin Sebor <msebor at gcc dot gnu.org> ---
The purpose of friendship is to grant access to class members that would
otherwise be inaccessible. The purpose of constructors is to establish class
invariants, and it is the responsibility of member functions and friends to
maintain them. There can certainly be implementation-only functions that need
to temporarily break invariants and HashTable::init_table_memset() could be
viewed as one, but those are the exceptions to the rule.
The goal of the warning is to help detect likely coding mistakes. In some
cases, it's impossible to reliably distinguish these from carefully crafted
code that is actually safe. It's a judgment call whether to err on the side of
false positives or false negatives. I think the MongoDB use cases are
sufficiently rare and specialized that warning for them is acceptable even
though the code is safe. The warnings are easy to avoid, either by following
the suggestions, or by suppressing it by one of the techniques I mentioned.
This might even provide an opportunity to improve the code. Expert programmers
should have no problem with that. Relaxing the warning, on the other hand,
would compromise its goal at the expense of less experienced or less careful
programmers.
As an aside, using assignment and copy constructors should be at least as
efficient as calling memset and memcpy, and ideally more, and they should
always be preferred over the raw memory functions. If/where they aren't as
efficient please open bugs for missing optimizations.
>From gcc-bugs-return-604220-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 18:18:30 2018
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Subject: [Bug other/85716] No easy way for end-user to tell what GCC is doing when compilation is slow
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--- Comment #3 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
More from #gcc on freenode:
<TemptorSent> dmalcolm - A flag to have gcc spit out what it's doing on
long-runnign compiles would be immensely useful! I'm still trying to debug
compile runs with checking=all running incredibly slowly, and haven't been able
to bifurcate a particular test yet.
<TemptorSent> ...perhaps a flag to echo the checking in progress and statistics
as it runs?
[...reference to this PR...]
<TemptorSent> I think the timestamp logging would be great, as well as a marker
for transitions between compilation phases.
<dmalcolm> TemptorSent: OK if I paste this IRC log into that BZ, or do you want
to add a comment to it?
<dmalcolm> also, do you need absolute timestamps, or is
relative-to-start-of-cc1 ok?
<dmalcolm> (I was just going to use relative to start of cc1)
<dmalcolm> (or cc1plus, whatever)
<TemptorSent> Relative should be fine, although tagging the start time with the
absolute time may be useful.
>From gcc-bugs-return-604221-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 18:21:52 2018
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Subject: [Bug go/82131] FAIL: TestCgoCallbackGC in gotools testsuite; segfaults in morestack.S:529
Date: Wed, 09 May 2018 18:21:00 -0000
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Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |WORKSFORME
--- Comment #4 from Uroš Bizjak <ubizjak at gmail dot com> ---
The segfault is gone with the latest gcc-9.
>From gcc-bugs-return-604222-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 18:24:44 2018
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Subject: [Bug other/85716] No easy way for end-user to tell what GCC is doing when compilation is slow
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--- Comment #4 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
<TemptorSent> Also, I'm not sure if it's available, but if we could print the
parent process and commandline passed at the beginning of an error report, and
tag the output for the error report with the PIDs, it would make tracking
things in parallel builds much easier.
>From gcc-bugs-return-604223-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 18:37:41 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85720] New: bad codegen for looped assignment of primitives at -O2
Date: Wed, 09 May 2018 18:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85720
Bug ID: 85720
Summary: bad codegen for looped assignment of primitives at -O2
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
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https://godbolt.org/g/qp19Cv
using SIZE_T = decltype(sizeof(0));
void fill(char* p, SIZE_T n) {
for (SIZE_T i = 0; i < n; i++){
p[i] = -1;
}
}
fill(char*, unsigned long):
test rsi, rsi
je .L1
add rsi, rdi
.L3:
mov BYTE PTR [rdi], -1
add rdi, 1
cmp rdi, rsi
jne .L3
.L1:
ret
At -O3 it basically just tail-calls memset.
Also applies to other types than char, but char is most egregious.
This ticket is spun out of from
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85707
>From gcc-bugs-return-604224-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 18:46:34 2018
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Subject: [Bug c++/85720] bad codegen for looped assignment of primitives at -O2
Date: Wed, 09 May 2018 18:46:00 -0000
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
That is because -ftree-loop-distribute-patterns is turned on only for -O3 and
above.
>From gcc-bugs-return-604225-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 18:49:52 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/82092] gcc fails to link genmodes on darwin (cfiStartsArray[i] != cfiStartsArray[i-1])
Date: Wed, 09 May 2018 18:49:00 -0000
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--- Comment #10 from Ryan Schmidt <gcc at ryandesign dot com> ---
Is gcc8 ever going to be buildable on macOS again? It's been unbuildable for 11
months now.
>From gcc-bugs-return-604226-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 18:56:15 2018
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Subject: [Bug c++/85721] New: bad codegen for looped copy of primitives at -O2 and -O3 (differently bad)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85721
Bug ID: 85721
Summary: bad codegen for looped copy of primitives at -O2 and
-O3 (differently bad)
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
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https://godbolt.org/g/Gg9fFt
Related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85720, but filed
separately because this also affects -O3. Similarly, while this affects types
other than char, char is most egregious.
using SIZE_T = decltype(sizeof(0));
void copy(char* out, const char* in, SIZE_T n) {
for (SIZE_T i = 0; i < n; i++){
out[i] = in[i];
}
}
This should probably just be compiled to check size then jmp memmove. At O2 it
copies byte-by-byte:
copy(char*, char const*, unsigned long):
test rdx, rdx
je .L1
xor eax, eax
.L3:
movzx ecx, BYTE PTR [rsi+rax]
mov BYTE PTR [rdi+rax], cl
add rax, 1
cmp rdx, rax
jne .L3
.L1:
ret
At O3 it generates a TON of code:
copy(char*, char const*, unsigned long):
test rdx, rdx
je .L1
lea rax, [rsi+16]
cmp rdi, rax
lea rax, [rdi+16]
setnb cl
cmp rsi, rax
setnb al
or cl, al
je .L7
lea rax, [rdx-1]
cmp rax, 14
jbe .L7
mov rcx, rdx
xor eax, eax
and rcx, -16
.L4:
movdqu xmm0, XMMWORD PTR [rsi+rax]
movups XMMWORD PTR [rdi+rax], xmm0
add rax, 16
cmp rax, rcx
jne .L4
mov rax, rdx
and rax, -16
cmp rdx, rax
je .L1
movzx ecx, BYTE PTR [rsi+rax]
mov BYTE PTR [rdi+rax], cl
lea rcx, [rax+1]
cmp rdx, rcx
jbe .L1
movzx ecx, BYTE PTR [rsi+1+rax]
mov BYTE PTR [rdi+1+rax], cl
lea rcx, [rax+2]
cmp rdx, rcx
jbe .L1
movzx ecx, BYTE PTR [rsi+2+rax]
mov BYTE PTR [rdi+2+rax], cl
lea rcx, [rax+3]
cmp rdx, rcx
jbe .L1
movzx ecx, BYTE PTR [rsi+3+rax]
mov BYTE PTR [rdi+3+rax], cl
lea rcx, [rax+4]
cmp rdx, rcx
jbe .L1
movzx ecx, BYTE PTR [rsi+4+rax]
mov BYTE PTR [rdi+4+rax], cl
lea rcx, [rax+5]
cmp rdx, rcx
jbe .L1
movzx ecx, BYTE PTR [rsi+5+rax]
mov BYTE PTR [rdi+5+rax], cl
lea rcx, [rax+6]
cmp rdx, rcx
jbe .L1
movzx ecx, BYTE PTR [rsi+6+rax]
mov BYTE PTR [rdi+6+rax], cl
lea rcx, [rax+7]
cmp rdx, rcx
jbe .L1
movzx ecx, BYTE PTR [rsi+7+rax]
mov BYTE PTR [rdi+7+rax], cl
lea rcx, [rax+8]
cmp rdx, rcx
jbe .L1
movzx ecx, BYTE PTR [rsi+8+rax]
mov BYTE PTR [rdi+8+rax], cl
lea rcx, [rax+9]
cmp rdx, rcx
jbe .L1
movzx ecx, BYTE PTR [rsi+9+rax]
mov BYTE PTR [rdi+9+rax], cl
lea rcx, [rax+10]
cmp rdx, rcx
jbe .L1
movzx ecx, BYTE PTR [rsi+10+rax]
mov BYTE PTR [rdi+10+rax], cl
lea rcx, [rax+11]
cmp rdx, rcx
jbe .L1
movzx ecx, BYTE PTR [rsi+11+rax]
mov BYTE PTR [rdi+11+rax], cl
lea rcx, [rax+12]
cmp rdx, rcx
jbe .L1
movzx ecx, BYTE PTR [rsi+12+rax]
mov BYTE PTR [rdi+12+rax], cl
lea rcx, [rax+13]
cmp rdx, rcx
jbe .L1
movzx ecx, BYTE PTR [rsi+13+rax]
mov BYTE PTR [rdi+13+rax], cl
lea rcx, [rax+14]
cmp rdx, rcx
jbe .L1
movzx edx, BYTE PTR [rsi+14+rax]
mov BYTE PTR [rdi+14+rax], dl
ret
.L7:
xor eax, eax
.L3:
movzx ecx, BYTE PTR [rsi+rax]
mov BYTE PTR [rdi+rax], cl
add rax, 1
cmp rdx, rax
jne .L3
.L1:
ret
A) This should probably just call memmove which has a tuned implementation for
many architectures and uses ifunc dispatch to choose the right one based on the
runtime CPU rather than the compile-time settings. Also, all functions like
this for all types would all just jump to a single function, there should be I$
advantages.
B) If you really want to emit code for this rather than calling into libc, it
is probably best to use their technique of overlapped reads and writes for the
last vector rather than going into an unrolled byte-by-byte loop:
https://github.molgen.mpg.de/git-mirror/glibc/blob/20003c49884422da7ffbc459cdeee768a6fee07b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S#L331-L335
>From gcc-bugs-return-604227-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 19:08:32 2018
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/85721] bad codegen for looped copy of primitives at -O2 and -O3 (differently bad)
Date: Wed, 09 May 2018 19:08:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Component|c++ |middle-end
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
At -O3, it is vectorized with an alias check at the beginning.
.L4:
movdqu xmm0, XMMWORD PTR [rsi+rax]
movups XMMWORD PTR [rdi+rax], xmm0
add rax, 16
cmp rax, rcx
jne .L4
That is a vectorized part of the loop
lea rax, [rsi+16]
cmp rdi, rax
lea rax, [rdi+16]
setnb cl
cmp rsi, rax
setnb al
or cl, al
je .L7
lea rax, [rdx-1]
cmp rax, 14
jbe .L7
That is an alias check, though it looks like it could be improved.
>From gcc-bugs-return-604228-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 19:13:06 2018
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Subject: [Bug middle-end/85720] bad codegen for looped assignment of primitives at -O2
Date: Wed, 09 May 2018 19:13:00 -0000
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--- Comment #2 from Mathias Stearn <redbeard0531 at gmail dot com> ---
Hmm. Taking the example from the -ftree-loop-distribute-patterns documentation,
it still seems to generate poor code, this time at both -O2 and -O3:
https://godbolt.org/g/EsQDj8
Why isn't that transformed to memset(A, 0, N); memset(B, 1, N); ? This feels
similar to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85721. Should I make a
new ticket with this example?
>From gcc-bugs-return-604229-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 19:22:33 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/29557] multilib zlib build broken. wrong path to prev-gcc
Date: Wed, 09 May 2018 19:22:00 -0000
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Chris Giorgi <chrisgiorgi at gmail dot com> changed:
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----------------------------------------------------------------------------
CC| |chrisgiorgi at gmail dot com
--- Comment #3 from Chris Giorgi <chrisgiorgi at gmail dot com> ---
I'm seeing a regression with the exact symptoms in GCC-7.3.1 when attempting to
build with internal zlib on x86_64 when it attempts to build the 32 bit
library.
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Subject: [Bug middle-end/85721] bad codegen for looped copy of primitives at -O2 and -O3 (differently bad)
Date: Wed, 09 May 2018 19:26:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
#include <algorithm>
void copy2(char* out, const char* in, SIZE_T n) {
std::copy(in, in+n, out);
}
At -O3:
copy2(char*, char const*, unsigned long):
test rdx, rdx
jne .L21
ret
.L21:
jmp memmove
#include <memory>
void copy3(char* out, const char* in, SIZE_T n) {
std::uninitialized_copy(in, in+n, out);
}
At -O3:
copy3(char*, char const*, unsigned long):
test rdx, rdx
jne .L21
ret
.L21:
jmp memmove
Even with -O1 these beat your loop hands down:
copy2(char*, char const*, unsigned long):
test rdx, rdx
jne .L11
ret
.L11:
sub rsp, 8
call memmove
add rsp, 8
ret
copy3(char*, char const*, unsigned long):
test rdx, rdx
jne .L18
ret
.L18:
sub rsp, 8
call memmove
add rsp, 8
ret
>From gcc-bugs-return-604231-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 19:28:31 2018
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Subject: [Bug middle-end/85720] bad codegen for looped assignment of primitives at -O2
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--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Mathias Stearn from comment #2)
> Hmm. Taking the example from the -ftree-loop-distribute-patterns
> documentation, it still seems to generate poor code, this time at both -O2
> and -O3: https://godbolt.org/g/EsQDj8
>
> Why isn't that transformed to memset(A, 0, N); memset(B, 1, N); ? This feels
> similar to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85721. Should I make
> a new ticket with this example?
Again, you are ignoring aliasing issues (just like in your other PR the
function copy isn't equivalent to memmove). Does adding __restrict change the
result? Also, B[i]=B[i]+1 doesn't look like a memset...
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Subject: [Bug middle-end/85721] bad codegen for looped copy of primitives at -O2 and -O3 (differently bad)
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--- Comment #3 from Mathias Stearn <redbeard0531 at gmail dot com> ---
@Jonathan Wakely, that is because std::copy cheats and calls memmove directly.
A slight modification of the type that shouldn't matter defeats that
optimization and causes both forms to degrade to byte-by-byte:
https://godbolt.org/g/Z4fWNT.
I actually consider that the fact that the explicit optimization in std::copy
is necessary should be considered an optimizer bug. Why isn't the optimizer
noticing that the simple implementation is the same as a memmove and do the
transformation for you? It generally seems unfortunate if similar code that
clearly means the same thing results in very different performance. Ideally,
even providing user-defined inline copy operations should result in calling
memmove if they are equivalent since the compiler should be able to "see
through" the non-triviality and optimize it all away.
I'm filing these tickets based on what Martin Sebor said: "As an aside, using
assignment and copy constructors should be at least as efficient as calling
memset and memcpy, and ideally more, and they should always be preferred over
the raw memory functions. If/where they aren't as efficient please open bugs
for missing optimizations." Do you disagree with that statement?
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Subject: [Bug c++/85713] [9 Regression] ICE in dependent_type_p, at cp/pt.c:24582 on invalid code
Date: Wed, 09 May 2018 19:47:00 -0000
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--- Comment #6 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Wed May 9 19:46:47 2018
New Revision: 260092
URL: https://gcc.gnu.org/viewcvs?rev=260092&root=gcc&view=rev
Log:
2018-05-09 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/85713
* g++.dg/cpp1y/lambda-generic-85713.C: New.
Added:
trunk/gcc/testsuite/g++.dg/cpp1y/lambda-generic-85713.C
Modified:
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/85713] [9 Regression] ICE in dependent_type_p, at cp/pt.c:24582 on valid code
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|ice-on-invalid-code |ice-on-valid-code
Summary|[9 Regression] ICE in |[9 Regression] ICE in
|dependent_type_p, at |dependent_type_p, at
|cp/pt.c:24582 on invalid |cp/pt.c:24582 on valid code
|code |
--- Comment #7 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Was in fact a serious ICE on valid, I added a minimized testcase.
>From gcc-bugs-return-604235-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 19:51:31 2018
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Subject: [Bug libffi/85722] New: testsuite failure in libffi
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Bug ID: 85722
Summary: testsuite failure in libffi
Product: gcc
Version: 7.3.1
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Priority: P3
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Experienced testsuite failure with gcc-7.3.1 svn259984, tracked down to
attached failure in libffi. On grepping, the same error for missing __i386__
appears 1391 times in the test logs, but only fails in libffi.
>From gcc-bugs-return-604236-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 19:53:10 2018
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From: "msharov at users dot sourceforge.net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/80354] Poor support to silence -Wformat-truncation=1
Date: Wed, 09 May 2018 19:53:00 -0000
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Mike Sharov <msharov at users dot sourceforge.net> changed:
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| |et
--- Comment #7 from Mike Sharov <msharov at users dot sourceforge.net> ---
I really do have to add my complaint about this one. Can't we have another
override option here? Have the compiler parse "truncates" in a comment, for
example, like it does for fallthrough. Doing format precision is not a good
workaround because it hardcodes the size of the buffer into the format string,
creating a maintenance problem in case the buffer size is increased later. Not
to mention unnecessarily creating multiple format strings where previously a
single one could have been shared. Why make us all create unnecessarily larger
executables?
Worse, truncation is always going to be a false positive here. Nobody wants to
choose buffer size based on worst case output. Sometimes it is merely useless,
such as when writing diagnostic messages. 8k of text won't fit in a message box
anyway and will be truncated. Other times it is distinctly wrong. For example,
if building a path from multiple components in PATH_MAX sized buffers, the
result must not be larger than PATH_MAX anyway, and must be truncated. Another
example is when you are trying to get a prefix from a large string. snprintf is
a great way of doing that, but your warning may now lead people to rewrite the
code with strncpy and its insecure behavior, possibly forgetting that it always
requires explicitly terminating the buffer.
Sure, it is just another warning to fix. I've had to fix some new warning with
every gcc release. Not a single one of them was an actual problem with the
code. It's always just "the way we've got to do things from now on", having to
write each code construct in a particular way to avoid a warning. A 100% false
positive rate is annoying, isn't it? Yet, I keep all warnings on, for some
strange reason. Can't we all be friends and always have a polite way of saying
"I know what I am doing here"?
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Subject: [Bug libffi/85722] testsuite failure in libffi
Date: Wed, 09 May 2018 19:55:00 -0000
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--- Comment #1 from Chris Giorgi <chrisgiorgi at gmail dot com> ---
Created attachment 44102
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44102&action=edit
config.log
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From: "pthaugen at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85698] [8/9 Regression] CPU2017 525.x264_r fails starting with r257581
Date: Wed, 09 May 2018 20:00:00 -0000
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--- Comment #3 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #2)
>
> Can you help me with isolating this to a single function inside that file?
> Maybe try sticking __attribute__((optimize("no-tree-vectorize"))) on some
> functions. Oh, there's also the vect_loop debug counter
> (-fdbg-cnt=vect_loop:N).
add4x4_idct() looks like the function, adding the attribute (or
"no-tree-slp-vectorize") to it resulted in a successful run.
> Otherwise I'll have to find a power8 machine where I can set up CPU 2017
> myself (unlikely this week due to public holidays).
Note that it also fails with -mcpu=power7, so a power8 machine is not needed.
>From gcc-bugs-return-604238-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 20:00:28 2018
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Subject: [Bug libffi/85722] testsuite failure in libffi
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--- Comment #2 from Chris Giorgi <chrisgiorgi at gmail dot com> ---
Can not attach libffi.log to bug because of bugzilla software error:
"Wide character in compress at Bugzilla/Attachment.pm line 859."
Please see http://termbin.com/zyur9 for content of file.
>From gcc-bugs-return-604240-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 20:09:49 2018
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Subject: [Bug middle-end/85720] bad codegen for looped assignment of primitives at -O2
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--- Comment #4 from Mathias Stearn <redbeard0531 at gmail dot com> ---
(In reply to Marc Glisse from comment #3)
> Again, you are ignoring aliasing issues (just like in your other PR the
> function copy isn't equivalent to memmove). Does adding __restrict change
> the result? Also, B[i]=B[i]+1 doesn't look like a memset...
Sorry, I typoed. It was supposed to be B[i] = A[i] + 1. That still does
basically the same thing though: https://godbolt.org/g/dtmU5t. Good point about
aliasing though. I guess the right code gen in that case would actually be
something that detected the overlap and did the right calls to memset to only
set each byte once. Or just do the simple thing:
if (b > a && b < a + n) {
memset(b, 1, n);
memset(a, 0, n);
} else {
memset(a, 0, n);
memset(b, 1, n);
}
Yes, __restrict helps, but that isn't part of standard c++, and it seems like
it never will be.
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Subject: [Bug libffi/85722] testsuite failure in libffi
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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is obsolete| |
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Created attachment 44105
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I've attached the file from that URL.
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Subject: [Bug libffi/85722] testsuite failure in libffi
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Chris Giorgi from comment #1)
> Created attachment 44102 [details]
> config.log
Configure command is:
../gcc-7.3.1/configure --disable-libssp --enable-multilib
--enable-version-specific-runtime-libs --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/7.3.1
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.3.1
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.3.1/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.3.1/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/include/g++-v7.3.1
--enable-libstdcxx-time --enable-__cxa_atexit --enable-clocale=gnu
--host=x86_64-pc-linux-gnu --enable-obsolete --disable-werror
--enable-libmudflap --enable-secureplt --enable-lto --with-system-zlib
--with-cloog --with-bugurl=http://bugs.funtoo.org --with-pkgversion=Funtoo
Hardened 7.3.1-r1 --enable-stage1-checking=assert,runtime,misc,tree,gc,rtlflag
--enable-checking=assert,runtime --enable-objc-gc
--enable-languages=c,c++,objc,obj-c++,fortran,go,ada --disable-libgcj
--enable-bootstrap --enable-shared --enable-threads=posix --enable-libgomp
--build=x86_64-pc-linux-gnu --enable-libgomp --enable-libsanitizer
--enable-default-pie --enable-default-ssp
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/7.3.1/python --enable-nls
--with-included-gettext --with-arch=westmere
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From: "roger at rankedgaming dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/19808] miss a warning about uninitialized member usage in member initializer list in constructor
Date: Wed, 09 May 2018 20:41:00 -0000
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--- Comment #42 from Roger Weber <roger at rankedgaming dot com> ---
I posted the latest duplicate of this bug, and I don't know anything about how
gcc works. I am very grateful for the hard work you guys put into this, but
just looking at the data. This bug was first reported 13 years ago - and I
think it's a pretty important one as one can easily make a mistake with
initialization.
>From gcc-bugs-return-604244-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 21:05:00 2018
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From: "manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/19808] miss a warning about uninitialized member usage in member initializer list in constructor
Date: Wed, 09 May 2018 21:04:00 -0000
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Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
--- Comment #43 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Roger Weber from comment #42)
> I posted the latest duplicate of this bug, and I don't know anything about
> how gcc works. I am very grateful for the hard work you guys put into this,
> but just looking at the data. This bug was first reported 13 years ago - and
> I think it's a pretty important one as one can easily make a mistake with
> initialization.
GCC is very large and growing and the number of GCC developers is very very
small and not growing. There are thousands of open bugs, thus developers need
to prioritize. If something was truly pretty important, someone would have
stepped up (or paid someone) to fix it. There is a 60 lines patch that fixes
most of the testcases here and could serve as inspiration to solve the rest.
The person who produced the patch left the work unfinished. Someone needs to
finish it:
https://gcc.gnu.org/wiki/GettingStarted#Basics:_Contributing_to_GCC_in_10_easy_steps
It is a simple as that.
>From gcc-bugs-return-604245-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 21:17:52 2018
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From: "wilson at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84797] RISC-V: add --with-multilib-list support
Date: Wed, 09 May 2018 21:17:00 -0000
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--- Comment #4 from Jim Wilson <wilson at gcc dot gnu.org> ---
Author: wilson
Date: Wed May 9 21:17:14 2018
New Revision: 260096
URL: https://gcc.gnu.org/viewcvs?rev=260096&root=gcc&view=rev
Log:
RISC-V: Add with-multilib-list support.
gcc/
PR target/84797
* config.gcc (riscv*-*-*): Handle --with-multilib-list.
* config/riscv/t-withmultilib: New.
* config/riscv/withmultilib.h: New.
* doc/install.texi: Document RISC-V --with-multilib-list support.
Added:
trunk/gcc/config/riscv/t-withmultilib
trunk/gcc/config/riscv/withmultilib.h
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config.gcc
trunk/gcc/doc/install.texi
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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/80354] Poor support to silence -Wformat-truncation=1
Date: Wed, 09 May 2018 21:43:00 -0000
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--- Comment #8 from Martin Sebor <msebor at gcc dot gnu.org> ---
The problem in the pathname example is one of the bugs the warning is meant to
prevent. Allowing a pathname to be silently truncated can lead to bugs -- see
CWE 22 for some background and CVE-2002-0499 for an example of a vulnerability
that can result from it.
A simple way to avoid the warning while also avoiding bugs resulting from
unhandled truncation is to detect it and abort if it happens, e.g., like so:
struct Path { char a[256]; };
void f (struct Path *d, const struct Path *s, int i)
{
int n = snprintf (d->a, sizeof d->a, "%s%d", s->a, i);
if ((size_t)n > sizeof d->a)
abort ();
// use d->a
}
Many warnings have a non-zero false positive rate, certainly all those that
depend on data or flow analysis, but the vast majority of them, certainly all
those in -Wall and -Wextra, try to strike a reasonable balance between false
and true positives, based on building entire Linux distributions. If you're
confident that the rate of GCC warnings for your code is 100% then the
appropriate mechanism to let the compiler know that "you know what you're
doing" and don't need its help in detecting bugs is to turn warnings off,
either individually of wholesale via -w.
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From: "joseph_marino at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85723] New: [C++17][DR 1496] __is_trivial intrinsic fails with no trivial non-deleted default c'tor
Date: Wed, 09 May 2018 21:47:00 -0000
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Bug ID: 85723
Summary: [C++17][DR 1496] __is_trivial intrinsic fails with no
trivial non-deleted default c'tor
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: joseph_marino at hotmail dot com
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gcc version 8.1.0 (GCC-Explorer-Build) when compiled with the flags:
-std=c++17 -Wall -Wextra
rejects the following code:
struct NonTrivial { NonTrivial() = delete; };
static_assert(!__is_trivial (NonTrivial), "NonTrivial is trivial");
emitting:
<source>:2:15: error: static assertion failed: NonTrivial is trivial
The assert should pass, as all default constructors of NonTrivial are deleted,
which does not meet the requirements in 12 [class] p6:
A trivial class is a class that is trivially copyable and has one or more
default constructors (15.1), all of which are either trivial or deleted and
**at least one of which is not deleted**.
This wording was introduced by the acceptance of DR 1496.
Full contents of compiling with -v follow:
Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-8.1.0/bin/g++
Target: x86_64-linux-gnu
Configured with: ../gcc-8.1.0/configure
--prefix=/opt/compiler-explorer/gcc-build/staging --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --enable-clocale=gnu --enable-languages=c,c++,fortran
--enable-ld=yes --enable-gold=yes --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-linker-build-id --enable-lto
--enable-plugins --enable-threads=posix --with-pkgversion=GCC-Explorer-Build
Thread model: posix
gcc version 8.1.0 (GCC-Explorer-Build)
COLLECT_GCC_OPTIONS='-fdiagnostics-color=always' '-g' '-o'
'/tmp/compiler-explorer-compiler11849-52-1aa40zw.lzvg/output.s' '-masm=intel'
'-S' '-v' '-std=c++17' '-Wall' '-Wextra' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
/opt/compiler-explorer/gcc-8.1.0/bin/../libexec/gcc/x86_64-linux-gnu/8.1.0/cc1plus
-quiet -v -imultiarch x86_64-linux-gnu -iprefix
/opt/compiler-explorer/gcc-8.1.0/bin/../lib/gcc/x86_64-linux-gnu/8.1.0/
-D_GNU_SOURCE <source> -quiet -dumpbase example.cpp -masm=intel -mtune=generic
-march=x86-64 -auxbase-strip
/tmp/compiler-explorer-compiler11849-52-1aa40zw.lzvg/output.s -g -Wall -Wextra
-std=c++17 -version -fdiagnostics-color=always -o
/tmp/compiler-explorer-compiler11849-52-1aa40zw.lzvg/output.s
GNU C++17 (GCC-Explorer-Build) version 8.1.0 (x86_64-linux-gnu)
compiled by GNU C version 5.4.0 20160609, GMP version 6.1.0, MPFR
version 3.1.4, MPC version 1.0.3, isl version isl-0.18-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory
"/opt/compiler-explorer/gcc-8.1.0/bin/../lib/gcc/x86_64-linux-gnu/8.1.0/../../../../x86_64-linux-gnu/include"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-8.1.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/8.1.0/../../../../include/c++/8.1.0"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-8.1.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/8.1.0/../../../../include/c++/8.1.0/x86_64-linux-gnu"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-8.1.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/8.1.0/../../../../include/c++/8.1.0/backward"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-8.1.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/8.1.0/include"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-8.1.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/8.1.0/include-fixed"
ignoring nonexistent directory
"/opt/compiler-explorer/gcc-8.1.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/8.1.0/../../../../x86_64-linux-gnu/include"
ignoring duplicate directory "/usr/include/x86_64-linux-gnu"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/x86_64-linux-gnu
/opt/compiler-explorer/gcc-8.1.0/bin/../lib/gcc/x86_64-linux-gnu/8.1.0/../../../../include/c++/8.1.0
/opt/compiler-explorer/gcc-8.1.0/bin/../lib/gcc/x86_64-linux-gnu/8.1.0/../../../../include/c++/8.1.0/x86_64-linux-gnu
/opt/compiler-explorer/gcc-8.1.0/bin/../lib/gcc/x86_64-linux-gnu/8.1.0/../../../../include/c++/8.1.0/backward
/opt/compiler-explorer/gcc-8.1.0/bin/../lib/gcc/x86_64-linux-gnu/8.1.0/include
/opt/compiler-explorer/gcc-8.1.0/bin/../lib/gcc/x86_64-linux-gnu/8.1.0/include-fixed
/usr/local/include
/opt/compiler-explorer/gcc-8.1.0/bin/../lib/gcc/../../include
/usr/include
End of search list.
GNU C++17 (GCC-Explorer-Build) version 8.1.0 (x86_64-linux-gnu)
compiled by GNU C version 5.4.0 20160609, GMP version 6.1.0, MPFR
version 3.1.4, MPC version 1.0.3, isl version isl-0.18-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 2a4ed8141a9e6ff21b9c06e24d4e4c1a
<source>:2:15: error: static assertion failed: NonTrivial is trivial
static_assert(!__is_trivial (NonTrivial), "NonTrivial is trivial");
^~~~~~~~~~~~~~~~~~~~~~~~~~
Compiler returned: 1
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From: "koenigni at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/25829] [F03] Asynchronous IO support
Date: Wed, 09 May 2018 22:43:00 -0000
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Nicolas Koenig <koenigni at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #44034|0 |1
is obsolete| |
--- Comment #40 from Nicolas Koenig <koenigni at gcc dot gnu.org> ---
Created attachment 44106
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44106&action=edit
Next version of patch
This patch works for reading and writing, for simple data types and
for arrays.
Still missing are mixed synchronous/asynchronous statements, inquire,
flush, backspace, rewind etc and error handling.
The reason why error handling is not implemented yet is that I do not
understand the standard, and I have not been able to find any
explanation for this:
9.7.1, paragraph 5:
If an error or end-of-file condition occurs during a wait operation for a unit,
the processor performs a wait
19 operation for all pending data transfer operations for that unit.
What does that mean? Does it mean that all pending transfers should be
thrown away, or that they should still be performed? I think the second
option is probably the right one, but it seems to make little sense since
trying to flush after and error results in loads and loads of corrupt
data.
>From gcc-bugs-return-604249-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 23:01:01 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 tree-optimization/85724] New: strspn of one-element arrays can be assumed to return zero
Date: Wed, 09 May 2018 23:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85724
Bug ID: 85724
Summary: strspn of one-element arrays can be assumed to return
zero
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
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GCC folds strlen() calls with one-element array arguments to zero but it
doesn't do that same for calls to strspn and strcspn with the same arguments
even though they too must return zero (they return the length of a substring in
the first argument).
$ cat u.c && gcc -O2 -S -Wall -fdump-tree-optimized=/dev/stdout u.c
extern char a[1];
int f (void)
{
return __builtin_strlen (a); // folded to 0
}
int g (const char *s)
{
return __builtin_strspn (a, s); // not folded
}
int h (const char *s)
{
return __builtin_strcspn (a, s); // not folded
}
;; Function f (f, funcdef_no=0, decl_uid=1957, cgraph_uid=0, symbol_order=0)
f ()
{
<bb 2> [local count: 1073741825]:
return 0;
}
;; Function g (g, funcdef_no=1, decl_uid=1960, cgraph_uid=1, symbol_order=1)
g (const char * s)
{
long unsigned int _1;
int _4;
<bb 2> [local count: 1073741825]:
_1 = __builtin_strspn (&a, s_3(D));
_4 = (int) _1;
return _4;
}
;; Function h (h, funcdef_no=2, decl_uid=1963, cgraph_uid=2, symbol_order=2)
h (const char * s)
{
long unsigned int _1;
int _4;
<bb 2> [local count: 1073741825]:
_1 = __builtin_strcspn (&a, s_3(D));
_4 = (int) _1;
return _4;
}
>From gcc-bugs-return-604250-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 23:04:07 2018
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From: "msharov at users dot sourceforge.net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/80354] Poor support to silence -Wformat-truncation=1
Date: Wed, 09 May 2018 23:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80354
--- Comment #9 from Mike Sharov <msharov at users dot sourceforge.net> ---
(In reply to Martin Sebor from comment #8)
> A simple way to avoid the warning while also avoiding bugs resulting from
> unhandled truncation is to detect it and abort if it happens, e.g.
First of all, you might want to mention this in the error message. The way it
is presently worded gives the impression that the only way to remove the
warning is to increase the buffer size. I guarantee you that most people will
just turn off the warning in this case. And then come here to complain, because
the kind of warning that is wrong in most cases (if only in our opinion) should
not be in -Wall.
Secondly, this is precisely the annoying part about it: you are making the
decision that allowing truncation to happen is always a bug and forcing it to
be handled as one. I do not consider it a problem to pass a truncated filename
to open and having it fail there. There are, naturally, some cases where this
could cause a security problem, but I am the one who should determine whether
each particular snprintf is one of those cases, and consequently I should also
have the option to tell the compiler that it is not. If I was ok with bloating
my program due to an excessive concern with safety, I'd be using Java, not C.
>From gcc-bugs-return-604251-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 23:08:15 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 tree-optimization/85725] New: strchr and strstr of a one-element array with a non-empty string can be assumed to return null
Date: Wed, 09 May 2018 23:08:00 -0000
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Bug ID: 85725
Summary: strchr and strstr of a one-element array with a
non-empty string can be assumed to return null
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
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Similarly to pr85724, calls to strchr, strrchr, and strstr with a one-element
array as the first argument can be folded to null when the second argument is a
non-empty string (or a non-zero character) because the only string that can be
stored in a one-element array is the empty string.
$ cat u.c && gcc -O2 -S -Wall -fdump-tree-optimized=/dev/stdout u.c
extern char a[1];
int f0 (void)
{
return __builtin_strlen (a); // folded to 0
}
char* f1 (void)
{
return __builtin_strchr (a, '1'); // can be folded to null
}
char* f2 (const char *s)
{
return __builtin_strstr (a, "123"); // can be folded to null
}
;; Function f0 (f0, funcdef_no=0, decl_uid=1957, cgraph_uid=0, symbol_order=0)
f0 ()
{
<bb 2> [local count: 1073741825]:
return 0;
}
;; Function f1 (f1, funcdef_no=1, decl_uid=1960, cgraph_uid=1, symbol_order=1)
f1 ()
{
char * _2;
<bb 2> [local count: 1073741825]:
_2 = __builtin_strchr (&a, 49); [tail call]
return _2;
}
;; Function f2 (f2, funcdef_no=2, decl_uid=1963, cgraph_uid=2, symbol_order=2)
f2 (const char * s)
{
char * _2;
<bb 2> [local count: 1073741825]:
_2 = __builtin_strstr (&a, "123"); [tail call]
return _2;
}
>From gcc-bugs-return-604252-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 23:32:51 2018
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From: "hp at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85726] New: div C1 to div C2 match.pd suboptimization
Date: Wed, 09 May 2018 23:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85726
Bug ID: 85726
Summary: div C1 to div C2 match.pd suboptimization
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
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See the attached test-case, ready to drop into testsuite/gcc.dg.
The suboptimization results in separate div and mod sequences
across all architectures where division or modulus by a constant
is implemented as a widened multiplication and right-shift
(actually most; at least x86_64, mips, ppc, aarch64). The
test-case doesn't fail for e.g. sparc, that doesn't do it that
way.
This is a somewhat long-standing suboptimality, but a regression.
The title hints at the cause and solution; patch to be posted.
>From gcc-bugs-return-604253-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 23:33:25 2018
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Subject: [Bug tree-optimization/85726] div C1 to div C2 match.pd suboptimization
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----------------------------------------------------------------------------
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>From gcc-bugs-return-604254-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 09 23:35:52 2018
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Subject: [Bug tree-optimization/85726] div C1 to div C2 match.pd suboptimization
Date: Wed, 09 May 2018 23:35:00 -0000
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--- Comment #1 from Hans-Peter Nilsson <hp at gcc dot gnu.org> ---
Created attachment 44107
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44107&action=edit
test-case
>From gcc-bugs-return-604255-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 00:24:07 2018
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Subject: [Bug other/85716] No easy way for end-user to tell what GCC is doing when compilation is slow
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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CC| |egallager at gcc dot gnu.org
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--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> ---
I think I remember someone suggesting a progress bar at one point; it involved
hacking the pass manager...
(confirmed)
>From gcc-bugs-return-604256-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 00:29:42 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/82092] [8/9 regression] gcc fails to link genmodes on darwin (cfiStartsArray[i] != cfiStartsArray[i-1])
Date: Thu, 10 May 2018 00:29:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|gcc fails to link genmodes |[8/9 regression] gcc fails
|on darwin |to link genmodes on darwin
|(cfiStartsArray[i] != |(cfiStartsArray[i] !=
|cfiStartsArray[i-1]) |cfiStartsArray[i-1])
--- Comment #11 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Ryan Schmidt from comment #10)
> Is gcc8 ever going to be buildable on macOS again? It's been unbuildable for
> 11 months now.
Maybe adding a regression marker will get people to notice...
>From gcc-bugs-return-604257-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 00:32:49 2018
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84797
Jim Wilson <wilson at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Jim Wilson <wilson at gcc dot gnu.org> ---
Fixed on mainline.
>From gcc-bugs-return-604258-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 03:23:24 2018
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Subject: [Bug rtl-optimization/85727] New: ICE in simplify_subreg, at simplify-rtx.c:6271
Date: Thu, 10 May 2018 03:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85727
Bug ID: 85727
Summary: ICE in simplify_subreg, at simplify-rtx.c:6271
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: ice-checking, ice-on-valid-code
Severity: normal
Priority: P3
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Target: powerpc-*-linux-gnu*
gcc-9.0.0-alpha20180506 snapshot (r259982) ICEs when compiling the following
snippet w/ -O2 -fno-dce -fno-forward-propagate -fno-guess-branch-probability
-fno-tree-coalesce-vars -fno-tree-dce -fno-tree-loop-im -fno-tree-pre
-fno-tree-sink -g:
long long int w9, t0;
int d1, zf;
void
ct (double nd, long long int lu, int xp, int cx, short int hz, char sb)
{
long long int yk = 0;
unsigned int i6 = hz;
int ae = xp;
t0 = cx;
while ((int) ((double) (1 / ae) + 1) / 3 == lu)
{
unsigned long long int ba = 0x8001;
yk = zf / ba - d1 + (ae - ba / (sb + 1));
nd = (i6 - yk) | (w9 + xp + ba);
ae = !sb + d1 / ba;
}
while (nd < 1.0)
hz = yk + t0 / sb;
}
% powerpc-e300c3-linux-gnu-gcc-9.0.0-alpha20180506 -O2 -fno-dce
-fno-forward-propagate -fno-guess-branch-probability -fno-tree-coalesce-vars
-fno-tree-dce -fno-tree-loop-im -fno-tree-pre -fno-tree-sink -g -c yudhcajz.c
during RTL pass: vartrack
yudhcajz.c: In function 'ct':
yudhcajz.c:24:1: internal compiler error: in simplify_subreg, at
simplify-rtx.c:6271
}
^
0xc2efb0 simplify_subreg(machine_mode, rtx_def*, machine_mode, poly_int<1u,
unsigned long>)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/simplify-rtx.c:6271
0xc332bb simplify_gen_subreg(machine_mode, rtx_def*, machine_mode, poly_int<1u,
unsigned long>)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/simplify-rtx.c:6525
0xfcec61 vt_expand_loc_callback
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/var-tracking.c:8470
0x78a049 cselib_expand_value_rtx_1
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/cselib.c:1679
0x789e2a cselib_expand_value_rtx_1
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/cselib.c:1753
0x78be7d cselib_expand_value_rtx_cb(rtx_def*, bitmap_head*, int, rtx_def*
(*)(rtx_def*, bitmap_head*, int, void*), void*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/cselib.c:1561
0xfcec3c vt_expand_loc_callback
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/var-tracking.c:8463
0x78a049 cselib_expand_value_rtx_1
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/cselib.c:1679
0x789e2a cselib_expand_value_rtx_1
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/cselib.c:1753
0x78be7d cselib_expand_value_rtx_cb(rtx_def*, bitmap_head*, int, rtx_def*
(*)(rtx_def*, bitmap_head*, int, void*), void*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/cselib.c:1561
0xfcf13a vt_expand_var_loc_chain
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/var-tracking.c:8366
0xfcf13a vt_expand_loc_callback
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/var-tracking.c:8529
0x78a100 cselib_expand_value_rtx_1
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/cselib.c:1714
0x78be7d cselib_expand_value_rtx_cb(rtx_def*, bitmap_head*, int, rtx_def*
(*)(rtx_def*, bitmap_head*, int, void*), void*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/cselib.c:1561
0xfcf13a vt_expand_var_loc_chain
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/var-tracking.c:8366
0xfcf13a vt_expand_loc_callback
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/var-tracking.c:8529
0x78be7d cselib_expand_value_rtx_cb(rtx_def*, bitmap_head*, int, rtx_def*
(*)(rtx_def*, bitmap_head*, int, void*), void*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/cselib.c:1561
0xfcec3c vt_expand_loc_callback
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/var-tracking.c:8463
0x78a049 cselib_expand_value_rtx_1
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/cselib.c:1679
0x78be7d cselib_expand_value_rtx_cb(rtx_def*, bitmap_head*, int, rtx_def*
(*)(rtx_def*, bitmap_head*, int, void*), void*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180506/work/gcc-9-20180506/gcc/cselib.c:1561
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>From gcc-bugs-return-604260-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 06:10:17 2018
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Subject: [Bug middle-end/85721] bad codegen for looped copy of primitives at -O2 and -O3 (differently bad)
Date: Thu, 10 May 2018 06:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85721
--- Comment #4 from Mathias Stearn <redbeard0531 at gmail dot com> ---
Marc Glisse pointed out at
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85720#c3 that my I missed an
aliasing case when I created this ticket. memmove isn't a valid replacement if
out is in the range (in, in + n). I did some benchmarking to see what the best
solution is and how much this matters. This seems to do the best on
sandybridge, haswell, and an Opteron 6344 Piledriver:
[[gnu::noinline, gnu::optimize("s")]] void copy0(char* out, const char* in,
size_t n) {
if (n >= 8 &&__builtin_expect(out >= in + n || out + n <= in, 1)) {
memcpy(out, in, n);
return;
}
for (size_t i = 0; i < n; i++){
out[i] = in[i];
}
}
copy0(char*, char const*, unsigned long):
cmp rdx, 7
jbe .L7
lea rax, [rsi+rdx]
cmp rdi, rax
jnb .L3
lea rax, [rdi+rdx]
cmp rsi, rax
jb .L7
.L3:
jmp memcpy
.L7:
xor eax, eax
.L5:
cmp rax, rdx
je .L1
mov cl, BYTE PTR [rsi+rax]
mov BYTE PTR [rdi+rax], cl
inc rax
jmp .L5
.L1:
ret
With char, it is substantially faster than the current codegen for the orignal
loop at -O2 and moderately faster than -O3, while being about 10% the size.
With a TriviallyCopiable type with a non-trivial default ctor, even -O3 does
byte-by-byte, so it is a substantial win there as well.
Let me know if you'd like me to post the benchmark I was using.
>From gcc-bugs-return-604261-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 07:37:16 2018
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85400
--- Comment #6 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Author: ebotcazou
Date: Thu May 10 07:36:38 2018
New Revision: 260106
URL: https://gcc.gnu.org/viewcvs?rev=260106&root=gcc&view=rev
Log:
PR c++/85400
cp/
* decl2.c (adjust_var_decl_tls_model): New static function.
(comdat_linkage): Call it on a variable.
(maybe_make_one_only): Likewise.
c-family/
* c-attribs.c (handle_visibility_attribute): Do not set no_add_attrs.
Added:
trunk/gcc/testsuite/g++.dg/tls/pr85400.C
Modified:
trunk/gcc/c-family/ChangeLog
trunk/gcc/c-family/c-attribs.c
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/decl2.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug tree-optimization/85699] [9 regression] gcc.dg/nextafter-2.c fail
Date: Thu, 10 May 2018 07:39:00 -0000
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu May 10 07:38:24 2018
New Revision: 260107
URL: https://gcc.gnu.org/viewcvs?rev=260107&root=gcc&view=rev
Log:
PR tree-optimization/85699
* gcc.dg/nextafter-1.c (NO_LONG_DOUBLE): Define if not defined. Use
!NO_LONG_DOUBLE instead of __LDBL_MANT_DIG__ != 106.
* gcc.dg/nextafter-2.c: Include stdlib.h. For glibc < 2.24 define
NO_LONG_DOUBLE to 1 before including nextafter-1.c.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/nextafter-1.c
trunk/gcc/testsuite/gcc.dg/nextafter-2.c
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Subject: [Bug c++/85400] invalid Local Dynamic TLS relaxation for symbol defined in method
Date: Thu, 10 May 2018 07:39:00 -0000
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Fixed on the mainline.
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Subject: [Bug c++/85728] New: strncpy -Wstringop-truncation
Date: Thu, 10 May 2018 08:18:00 -0000
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Bug ID: 85728
Summary: strncpy -Wstringop-truncation
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
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const char* Status::CopyState(const char* state) {
const size_t cch = std::strlen(state) + 1; // +1 for the null terminator
char* const result = new char[cch];
result[cch - 1] = '\0';
#ifdef OS_WIN
errno_t ret;
ret = strncpy_s(result, cch, state, cch - 1);
assert(ret == 0);
#else
std::strncpy(result, state, cch - 1);
#endif
return result;
}
error: ‘char* strncpy(char*, const char*, size_t)’ output truncated before
terminating nul copying as many bytes from a string as its length
[-Werror=stringop-truncation]
std::strncpy(result, state, cch);
~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
status.cc:18:33: note: length computed here
const size_t cch = std::strlen(state);
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Subject: [Bug ipa/85656] gcc.dg/ipa/ipa-icf-38.c FAILs
Date: Thu, 10 May 2018 08:41:00 -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> ---
Can you please attach WPA ICF dump file. It should say why it's failing.
And do you know how long has been that failing?
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Subject: [Bug target/85718] Incorrect name mangling for va_list on mipsel
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--- Comment #5 from Richard Oliver <roliver at roku dot com> ---
(In reply to Jonathan Wakely from comment #4)
> So then this behaviour is correct and working as intended.
Even accepting the fact that 'void *' is a valid implementation for va_args,
surely the code generation is wrong in my original bug report for:
'log("Location of i: %p", &i)' as the '...' version should be selected in the
generated code?
'bl _Z3logPKcz' is generated on ARM, and 'jal _Z3logPKcPv' is
generated on MIPS.
Surely this is independent of the internal implementation of 'va_args' as we're
not actually calling that function. Commenting out the va_list
forward-declaration results in the correct code being generated.
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Subject: [Bug sanitizer/85389] posix_memalign() crash with address sanitizer when passing invalid arguments
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
So it's nice what we do currently, this works for me:
$ gcc pr85329.c -fsanitize=address && ASAN_OPTIONS=allocator_may_return_null=1
./a.out
rv = 22
ptr = 0xffffffffffffffff
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Subject: [Bug ipa/85656] gcc.dg/ipa/ipa-icf-38.c FAILs
Date: Thu, 10 May 2018 09:25:00 -0000
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--- Comment #3 from Rainer Orth <ro at gcc dot gnu.org> ---
Created attachment 44108
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44108&action=edit
i386-pc-solaris2.11 ipa-icf-38.exe.wpa.073i.icf
It's only one part that fails
FAIL: gcc.dg/ipa/ipa-icf-38.c scan-ltrans-tree-dump-not fixup_cfg4 "Function
bar"
which was introduced by
2018-05-02 Tom de Vries <tom@codesourcery.com>
PR testsuite/85106
* gcc.dg/ipa/ipa-icf-38.c: Use scan-ltrans-tree-dump.
[...]
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Subject: [Bug other/63426] [meta-bug] Issues found with -fsanitize=undefined
Date: Thu, 10 May 2018 10:16:00 -0000
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Bug 63426 depends on bug 64914, which changed state.
Bug 64914 Summary: [UBSAN/bootstrap-ubsan] With -g3: libiberty/md5.c:336:7: runtime error: load of misaligned address for type 'const md5_uint32', which requires 4 byte alignment
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64914
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Resolution|--- |FIXED
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/64914] [UBSAN/bootstrap-ubsan] With -g3: libiberty/md5.c:336:7: runtime error: load of misaligned address for type 'const md5_uint32', which requires 4 byte alignment
Date: Thu, 10 May 2018 10:16:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-604269-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 10:16:19 2018
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Subject: [Bug bootstrap/64914] [UBSAN/bootstrap-ubsan] With -g3: libiberty/md5.c:336:7: runtime error: load of misaligned address for type 'const md5_uint32', which requires 4 byte alignment
Date: Thu, 10 May 2018 10:16:00 -0000
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Thu May 10 10:15:42 2018
New Revision: 260112
URL: https://gcc.gnu.org/viewcvs?rev=260112&root=gcc&view=rev
Log:
Improve boostrap-ubsan config (PR bootstrap/64914).
2018-05-10 Martin Liska <mliska@suse.cz>
PR bootstrap/64914
* bootstrap-ubsan.mk: Define UBSAN_BOOTSTRAP.
2018-05-10 Martin Liska <mliska@suse.cz>
PR bootstrap/64914
* md5.c: Use strict alignment with UBSAN_BOOTSTRAP.
Modified:
trunk/config/ChangeLog
trunk/config/bootstrap-ubsan.mk
trunk/libiberty/ChangeLog
trunk/libiberty/md5.c
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Subject: [Bug fortran/70864] internal compiler error: in gfc_get_symbol_decl, at fortran/trans-decl.c:1403
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--- Comment #5 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Thu May 10 10:48:50 2018
New Revision: 260113
URL: https://gcc.gnu.org/viewcvs?rev=260113&root=gcc&view=rev
Log:
2018-05-10 Paul Thomas <pault@gcc.gnu.org>
PR fortran/68846
PR fortran/70864
* resolve.c (get_temp_from_expr): The temporary must not have
dummy or intent attributes.
2018-05-10 Paul Thomas <pault@gcc.gnu.org>
PR fortran/68846
* gfortran.dg/temporary_3.f90 : New test.
PR fortran/70864
* gfortran.dg/temporary_2.f90 : New test.
Added:
trunk/gcc/testsuite/gfortran.dg/temporary_2.f90
trunk/gcc/testsuite/gfortran.dg/temporary_3.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/resolve.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/68846] Pointer function as LValue doesn't work when the assignment regards a dummy argument.
Date: Thu, 10 May 2018 10:49:00 -0000
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--- Comment #7 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Thu May 10 10:48:50 2018
New Revision: 260113
URL: https://gcc.gnu.org/viewcvs?rev=260113&root=gcc&view=rev
Log:
2018-05-10 Paul Thomas <pault@gcc.gnu.org>
PR fortran/68846
PR fortran/70864
* resolve.c (get_temp_from_expr): The temporary must not have
dummy or intent attributes.
2018-05-10 Paul Thomas <pault@gcc.gnu.org>
PR fortran/68846
* gfortran.dg/temporary_3.f90 : New test.
PR fortran/70864
* gfortran.dg/temporary_2.f90 : New test.
Added:
trunk/gcc/testsuite/gfortran.dg/temporary_2.f90
trunk/gcc/testsuite/gfortran.dg/temporary_3.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/resolve.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/68846] Pointer function as LValue doesn't work when the assignment regards a dummy argument.
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Paul Thomas <pault at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |pault at gcc dot gnu.org
--- Comment #8 from Paul Thomas <pault at gcc dot gnu.org> ---
I will backport as soon as I have time.
Paul
>From gcc-bugs-return-604275-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 10:51:44 2018
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Subject: [Bug fortran/70864] internal compiler error: in gfc_get_symbol_decl, at fortran/trans-decl.c:1403
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Paul Thomas <pault at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |pault at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |pault at gcc dot gnu.org
--- Comment #6 from Paul Thomas <pault at gcc dot gnu.org> ---
I will backport as soon as I have time.
Paul
>From gcc-bugs-return-604276-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 11:10:05 2018
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From: "nsz at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/85729] New: including c++ headers within extern "C" linkage specification
Date: Thu, 10 May 2018 11:10:00 -0000
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Bug ID: 85729
Summary: including c++ headers within extern "C" linkage
specification
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
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Reporter: nsz at gcc dot gnu.org
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some code does not include c++ headers in the top level but has
extern "C" {
#include <cstring>
}
this is invalid c++ (similar to bug 19373 where the include is under
namespace specification), but this can be made to work for c*
headers by adding explicit extern "C++" annotations where necessary
in libstdc++ headers. (currently it happens to work with a normal
gnu toolchain, because then glibc provides the string function
prototypes with explicit extern "C++", but with other setups it
can fail.)
alternatively gcc could try to warn about such header usage,
the relevant text in the spec is
[using.headers]:
A translation unit shall include a header only outside of any external
declaration or definition, and shall include the header lexically
before the first reference in that translation unit to any of the
entities declared in that header. No diagnostic is required.
>From gcc-bugs-return-604277-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 11:25:33 2018
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Subject: [Bug libstdc++/85729] including c++ headers within extern "C" linkage specification
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
See also PR 69386 where we had to workaround:
extern "C" {
#inclue <winapi.h>
}
which includes <stdlib.h> which includes <cstdlib>. Sigh.
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Subject: [Bug tree-optimization/85730] New: complex code for modifying lowest byte in a 4-byte vector
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85730
Bug ID: 85730
Summary: complex code for modifying lowest byte in a 4-byte
vector
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: tree-optimization
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Reporter: zsojka at seznam dot cz
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Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 44109
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44109&action=edit
reduced testcase
The attached testcase has 3 implementations of the same function, yet the
compiled code differs: (@ -O3)
foo:
movsx edx, dil
mov eax, edi
add edx, edx
mov al, dl
ret
bar:
mov eax, edi
add al, al
ret
baz:
movsx edx, dil
mov eax, edi
add edx, edx
mov al, dl
ret
bar() has the shortest code and is also using fewer registers. I tried
benchmarking all 3 functions on a Skylake CPU; I could not find out which
function is the fastest (the jitter was too high).
The difference between foo() and bar() is that bar() is compiled with
-fno-tree-ccp -fno-tree-fre. baz() has one extra constant in the code, which
needs to be propagated in foor() and bar().
>From gcc-bugs-return-604279-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 12:13:11 2018
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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85730] complex code for modifying lowest byte in a 4-byte vector
Date: Thu, 10 May 2018 12:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85730
Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-10
Component|tree-optimization |target
Ever confirmed|0 |1
--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
At gimple, the difference is essentially
BIT_FIELD_REF <v, 8, 0> = _6;
vs
v_9 = BIT_INSERT_EXPR <v_8(D), _4, 0 (8 bits)>;
Before combine, that translates to modifying a register directly
(insn 6 3 7 2 (set (reg:SI 93 [ v ])
(sign_extend:SI (subreg:QI (reg/v:SI 92 [ v ]) 0))) "v.c":6 155
{extendqisi2}
(nil))
(insn 7 6 8 2 (parallel [
(set (reg:SI 94)
(ashift:SI (reg:SI 93 [ v ])
(const_int 1 [0x1])))
(clobber (reg:CC 17 flags))
]) "v.c":6 550 {*ashlsi3_1}
(expr_list:REG_DEAD (reg:SI 93 [ v ])
(expr_list:REG_UNUSED (reg:CC 17 flags)
(nil))))
(insn 8 7 13 2 (set (strict_low_part (subreg:QI (reg/v:SI 92 [ v ]) 0))
(subreg:QI (reg:SI 94) 0)) "v.c":6 101 {*movstrictqi_1}
(expr_list:REG_DEAD (reg:SI 94)
(nil)))
or modifying a copy of it
(sign_extend:SI (subreg:QI (reg/v:SI 92 [ v ]) 0))) "v.c":12 155
{extendqisi2}
(nil))
(insn 7 6 9 2 (parallel [
(set (reg:SI 94)
(ashift:SI (reg:SI 93 [ v ])
(const_int 1 [0x1])))
(clobber (reg:CC 17 flags))
]) "v.c":12 550 {*ashlsi3_1}
(expr_list:REG_DEAD (reg:SI 93 [ v ])
(expr_list:REG_UNUSED (reg:CC 17 flags)
(nil))))
(insn 9 7 10 2 (set (reg:SI 96 [ v ])
(reg/v:SI 92 [ v ])) "v.c":12 86 {*movsi_internal}
(expr_list:REG_DEAD (reg/v:SI 92 [ v ])
(nil)))
(insn 10 9 15 2 (set (strict_low_part (subreg:QI (reg:SI 96 [ v ]) 0))
(subreg:QI (reg:SI 94) 0)) "v.c":12 101 {*movstrictqi_1}
(expr_list:REG_DEAD (reg:SI 94)
(nil)))
and combine only manages to match in the first case
(insn 8 7 13 2 (parallel [
(set (strict_low_part (subreg:QI (reg/v:SI 92 [ v ]) 0))
(ashift:QI (subreg:QI (reg/v:SI 92 [ v ]) 0)
(const_int 1 [0x1])))
(clobber (reg:CC 17 flags))
]) "v.c":6 556 {*ashlqi3_1_slp}
(expr_list:REG_UNUSED (reg:CC 17 flags)
(nil)))
Operations on partial registers are often not so fast, but in any case it seems
that we should generate the same code for both cases. Either target or
rtl-optimization.
>From gcc-bugs-return-604280-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 12:18:56 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/71181] Reserving in unordered_map doesn't reserve enough
Date: Thu, 10 May 2018 12:18:00 -0000
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
François, I think you fixed this for GCC 7.1, so should we close the bug
report?
>From gcc-bugs-return-604281-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 12:22:57 2018
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From: "jaak at ristioja dot ee" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85731] New: [8/9 Regression] Inner class method declaration changes meaning of outer template class template method
Date: Thu, 10 May 2018 12:22:00 -0000
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Bug ID: 85731
Summary: [8/9 Regression] Inner class method declaration
changes meaning of outer template class template
method
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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The following code compiles with GCC 7.3.0 and earlier, but errors with GCC
8.1.0 and trunk.
template <typename T>
struct Outer {
struct Inner;
template <int I> static void f();
};
template <typename T>
struct Outer<T>::Inner {
decltype(Outer<T>::f<42>()) f();
};
int main() { Outer<int>::Inner().f(); }
<source>: In instantiation of 'struct Outer<int>::Inner':
<source>:12:36: required from here
<source>:8:28: error: declaration of 'decltype (f<42>()) Outer<T>::Inner::f()
[with T = int; decltype (f<42>()) = void]' [-fpermissive]
struct Outer<T>::Inner {
^
<source>:4:38: error: changes meaning of 'f' from 'static void Outer<T>::f()
[with int I = I; T = int]' [-fpermissive]
template <int I> static void f();
^
>From gcc-bugs-return-604282-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 12:23:31 2018
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Subject: [Bug c++/85732] New: use_facet<moneypunct<char, true>>(mylocale) retrieving wrong locale information
Date: Thu, 10 May 2018 12:23:00 -0000
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Bug ID: 85732
Summary: use_facet<moneypunct<char, true>>(mylocale) retrieving
wrong locale information
Product: gcc
Version: 6.4.0
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Created attachment 44110
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44110&action=edit
Source code and test output results showing error
Dear Bug Team,
I just recently upgraded using "apt" my Ubuntu 16.04 system and gcc was
upgraded from 6.2.0 to 6.4.0 which introduced the following bug.
In the attached archive is a program "testlocale.cpp" which requires only
gcc-supplied header files. The command line to compile it and execute it is in
the comments at the top of the file.
In essence, it tests each facet of three locales (on my system "en_US.utf8",
"pt_BR.utf8" and "C" locales. All worked perfectly in g++ 6.2.0. As of g++
6.4.0, all of the facets, except the "moneypunct" facet work properly (see line
134).
Here is my information:
Linux version
$ uname -a
Linux asusubuntu16 4.13.0-41-generic #46~16.04.1-Ubuntu SMP Thu May 3 10:06:43
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Compiler version
$ gcc --version
gcc (Ubuntu 5.5.0-12ubuntu1~16.04) 5.5.0 20171010
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compile command:
$ g++ -std=c++14 -m64 testlocale.cpp -static -o testlocale
Run command:
$ ./testlocale > testlocale.out
Attached is a test output generated by gcc 6.4.0 on my system. Of course, you
can test it on your system yourself and try to duplicate the error.
Best regards,
Tom Straub
>From gcc-bugs-return-604283-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 12:26:08 2018
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Subject: [Bug c++/70693] valgrind error in get_visual_column
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--- Comment #3 from David Binderman <dcb314 at hotmail dot com> ---
Reduced code seems to be
class a {
public: typedef char b;
};
namespace {
class c {
enum {
}
d;
bool e(a::b );
};
bool c::e(a::b ) {
switch( d ) {
if( '>' ) ;
break;
}
}
}
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Subject: [Bug c++/85732] use_facet<moneypunct<char, true>>(mylocale) retrieving wrong locale information
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--- Comment #1 from Tom Straub <gnu-org at bignm dot com> ---
Sorry, wrong compiler included in post, here is the right one:
$ g++ --version
g++ (Ubuntu 6.4.0-17ubuntu1~16.04) 6.4.0 20180424
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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David Binderman <dcb314 at hotmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org
--- Comment #4 from David Binderman <dcb314 at hotmail dot com> ---
svn blame seems to indicate that dmalcolm may be able to help.
>From gcc-bugs-return-604286-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 12:31:47 2018
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From: "antoshkka at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/82899] *this in constructors could not alias with reference input parameters of the same type
Date: Thu, 10 May 2018 12:31:00 -0000
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--- Comment #9 from Antony Polukhin <antoshkka at gmail dot com> ---
There's an identical issue for clang:
https://bugs.llvm.org/show_bug.cgi?id=37329
During review of that issue Richard Smith noted that the solution could be made
more generic by adding `__restrict` for `this` for any constructor (not just
copy and move constructors).
Does the violation of noalias in GCC could be treated as unspecified behavior
or is it undefined?
>From gcc-bugs-return-604287-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 12:36:23 2018
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Subject: [Bug libstdc++/85729] including c++ headers within extern "C" linkage specification
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu May 10 12:35:45 2018
New Revision: 260114
URL: https://gcc.gnu.org/viewcvs?rev=260114&root=gcc&view=rev
Log:
PR libstdc++/85729 add linkage specifications to headers
PR libstdc++/85729
* include/bits/c++config.h (__replacement_assert): Add linkage
specification.
* include/bits/std_abs.h: Add comment to closing brace of block.
* include/c_global/cstddef: Add linkage specification.
* include/c_global/cstring: Likewise.
* include/c_global/cwchar: Likewise.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/bits/c++config
trunk/libstdc++-v3/include/bits/std_abs.h
trunk/libstdc++-v3/include/c_global/cstddef
trunk/libstdc++-v3/include/c_global/cstring
trunk/libstdc++-v3/include/c_global/cwchar
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Does that fix it?
If not then we'll need a preprocessed reproducer.
>From gcc-bugs-return-604289-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 12:47:46 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/85732] use_facet<moneypunct<char, true>>(mylocale) retrieving wrong locale information
Date: Thu, 10 May 2018 12:47:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-05-10
Ever confirmed|0 |1
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It works fine for me with any version of GCC, including 6.4.0
Testing 'moneypunct' Facet:
--> Setting locale 'pt_BR.utf8'
Natl Currency Symbol = 'R$'
Intl Currency Symbol = 'BRL '
Natl Positive Sign = ''
Intl Positive Sign = ''
Natl Positive Format = { sign, symbol, space, value }
Intl Positive Format = { sign, symbol, space, value }
Natl Negative Sign = '-'
Natl Negative Format = { sign, symbol, space, value }
Intl Negative Sign = '-'
Intl Negative Format = { sign, symbol, space, value }
Natl Decimal Point = ','
Intl Decimal Point = ','
Natl Thousands Separator = '.'
Intl Thousands Separator = '.'
Natl Fractional Digits = '2'
Intl Fractional Digits = '2'
Natl Grouping Length [0] = 3 digits
Natl Grouping Length [1] = 3 digits
Intl Grouping Length [0] = 3 digits
Intl Grouping Length [1] = 3 digits
Are you sure something else didn't change on your system at the same time? The
C++ library just parses the locale definition data on your system, that data
comes from glibc not from GCC.
>From gcc-bugs-return-604290-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 12:50:18 2018
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Subject: [Bug libstdc++/85732] use_facet<moneypunct<char, true>>(mylocale) retrieving wrong locale information
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Oh I take it back, when I use -static I can reproduce the problem.
>From gcc-bugs-return-604291-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 12:56:40 2018
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Subject: [Bug rtl-optimization/85180] Infinite loop in RTL DSE optimizer
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Matt Weber <matthew.weber at rockwellcollins dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |matthew.weber@rockwellcolli
| |ns.com
--- Comment #20 from Matt Weber <matthew.weber at rockwellcollins dot com> ---
Another datapoint that libnss 3.35 fails to build on the microblaze arch
(uclibc) with any of the 6.x series and this bug's patch resolves that
(https://github.com/gcc-mirror/gcc/commit/df03ebc3574a0d7893127e3b9754a01abf2d8b70).
microblazeel-buildroot-linux-uclibc-gcc -o
Linux2.6_microblazeel_microblazeel-buildroot-linux-uclibc-gcc.br_real_glibc_PTH_OPT.OBJ/sslgrp.o
-c -O2 -fPIC -pipe -ffunction-sections -fdata-sections -DHAVE_STRERROR
-DLINUX -Dlinux -Wall -Werror -DXP_UNIX -UDEBUG -DNDEBUG -D_REENTRANT
-DNSS_NO_INIT_SUPPORT -DUSE_UTIL_DIRECTLY -DNO_NSPR_10_SUPPORT
-DSSL_DISABLE_DEPRECATED_CIPHER_SUITE_NAMES -Isysroot/usr/include/nspr
-Ilibnss-3.35/dist/include -I../../../dist/public/nss
-I../../../dist/private/nss sslgrp.c
However the libnss build works fine with the 7.x branch and master. I've been
bisecting all 3 branches for a few days and figured I should just try this
patch before debugging the 6.x branch further. I even went back and tried to
find common ancestors between the 6.x and 7.x and couldn't get a point where
the good/bad builds matched up. Guessing backports on 6.x from master
introduced the libnss bug variant as the gcc/cse* and gcc/alias.x files had a
lot of updates from 5.x to 7.x.
Here's the stack trace on cc1 when its hung building a libnss sslgrp.c
file.......
( A lot more find_base_terms() before this one)
#71 0x00000000005ae67d in find_base_term(rtx_def*) ()
#72 0x00000000005ae532 in find_base_term(rtx_def*) ()
#73 0x00000000005ae67d in find_base_term(rtx_def*) ()
#74 0x00000000005ae532 in find_base_term(rtx_def*) ()
#75 0x00000000005ae67d in find_base_term(rtx_def*) ()
#76 0x00000000005ae568 in find_base_term(rtx_def*) ()
#77 0x00000000005b137d in write_dependence_p(rtx_def const*, rtx_def const*,
machine_mode, rtx_def*, bool, bool, bool) ()
#78 0x00000000005b1585 in canon_anti_dependence(rtx_def const*, bool, rtx_def
const*, machine_mode, rtx_def*) ()
#79 0x000000000061c5e3 in cselib_invalidate_mem(rtx_def*) ()
#80 0x000000000061d32d in cselib_record_sets(rtx_insn*) ()
#81 0x000000000061e5c8 in cselib_process_insn(rtx_insn*) ()
#82 0x00000000008774b8 in reload_cse_regs_1() ()
#83 0x00000000008777dc in (anonymous
namespace)::pass_postreload_cse::execute(function*) ()
#84 0x000000000086714d in execute_one_pass(opt_pass*) ()
>From gcc-bugs-return-604292-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 13:08:44 2018
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Subject: [Bug libstdc++/85732] use_facet<moneypunct<char, true>>(mylocale) retrieving wrong locale information
Date: Thu, 10 May 2018 13:08:00 -0000
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced:
#include <iostream>
#include <locale>
using namespace std;
void test(std::locale loc)
{
cout << "--> Setting locale '" << loc.name() << "'\n";
const moneypunct<char, true> & l_facMoneyIntl = use_facet<moneypunct<char,
true> >(loc);
const moneypunct<char, false> & l_facMoneyNatl = use_facet<moneypunct<char,
false> >(loc);
cout << "Natl Currency Symbol = '"; cout << l_facMoneyNatl.curr_symbol();
cout << "'" << "\n";
cout << "Intl Currency Symbol = '"; cout << l_facMoneyIntl.curr_symbol();
cout << "'" << "\n";
cout << "\n";
}
int main(int argc, char** argv)
{
locale global ("");
// locale::global(global);
test(locale(argc == 1 ? "pt_BR.utf8" : argv[1]));
test(global);
test(locale("C"));
}
Without -static this produces something like:
--> Setting locale 'pt_BR.utf8'
Natl Currency Symbol = 'R$'
Intl Currency Symbol = 'BRL '
--> Setting locale
'LC_CTYPE=en_GB.UTF-8;LC_NUMERIC=en_GB.UTF-8;LC_TIME=en_GB.UTF-8;LC_COLLATE=C;LC_MONETARY=en_GB.UTF-8;LC_MESSAGES=en_GB.UTF-8;LC_PAPER=en_GB.UTF-8;LC_NAME=en_GB.UTF-8;LC_ADDRESS=en_GB.UTF-8;LC_TELEPHONE=en_GB.UTF-8;LC_MEASUREMENT=en_GB.UTF-8;LC_IDENTIFICATION=en_GB.UTF-8'
Natl Currency Symbol = '£'
Intl Currency Symbol = 'GBP '
--> Setting locale 'C'
Natl Currency Symbol = ''
Intl Currency Symbol = ''
But with -static the fields are all blank:
--> Setting locale 'pt_BR.utf8'
Natl Currency Symbol = ''
Intl Currency Symbol = ''
--> Setting locale
'LC_CTYPE=en_GB.UTF-8;LC_NUMERIC=en_GB.UTF-8;LC_TIME=en_GB.UTF-8;LC_COLLATE=C;LC_MONETARY=en_GB.UTF-8;LC_MESSAGES=en_GB.UTF-8;LC_PAPER=en_GB.UTF-8;LC_NAME=en_GB.UTF-8;LC_ADDRESS=en_GB.UTF-8;LC_TELEPHONE=en_GB.UTF-8;LC_MEASUREMENT=en_GB.UTF-8;LC_IDENTIFICATION=en_GB.UTF-8'
Natl Currency Symbol = ''
Intl Currency Symbol = ''
--> Setting locale 'C'
Natl Currency Symbol = ''
Intl Currency Symbol = ''
I can reproduce this with any version tested (back to 4.3.6).
>From gcc-bugs-return-604293-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 13:15:21 2018
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Subject: [Bug libstdc++/85732] use_facet<moneypunct<char, true>>(mylocale) retrieving wrong locale information
Date: Thu, 10 May 2018 13:15:00 -0000
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--- Comment #5 from Tom Straub <gnu-org at bignm dot com> ---
Hi Johnathon,
Okay, thanks for confirming. I didn't realize it was such as old bug. You're
right, I just recently switched over to using -static (got tired of the library
mismatches with multiple gcc versions on my system).
Best, Tom
>From gcc-bugs-return-604294-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 13:20:16 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85606] [8 regression] Assembly file generated for ARM Cortex-M0 should not specify `.arch armv6-m` at all or use `.arch armv6s-m`
Date: Thu, 10 May 2018 13:20:00 -0000
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Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-10
Target Milestone|--- |8.2
Summary|Assembly file generated for |[8 regression] Assembly
|ARM Cortex-M0 should not |file generated for ARM
|specify `.arch armv6-m` at |Cortex-M0 should not
|all or use `.arch armv6s-m` |specify `.arch armv6-m` at
| |all or use `.arch armv6s-m`
Ever confirmed|0 |1
--- Comment #1 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
This is the convergence of a number of niggly issues.
Initially Arm defined both ARMv6-M and ARMv6S-M. The two differed only by
support for the SVC instruction in the latter. Later, they dropped the name
ARMv6S-M but added support for SVC to ARMv6-M (in effect they made ARMv6-M
equivalent to ARMv6S-M).
To avoid massive churn on the assembler every time new CPU names are added, we
changed GCC-8 to not emit CPU names directly into the assembler files
(architecture names are much more stable and smaller in number); this makes it
far more likely that you won't have to update GAS each time a new CPU name is
added (a Good Thing TM).
Cortex-m0, cortex-m0plus and cortex-m1 are all ARMv6-M parts, but they are
really, in GCC/gas terminology ARMv6S-M parts. Gas seems to treat these CPUs
as ARMv6S-M, but still distinguishes between v6-M and v6S-M, hence the failure
reported.
So I think the compiler should treat all these parts as ARMv6S-M going forward.
That's a fairly simple change to arm-cpus.in.
I think GAS needs some changes as well, to make .arch armv6-m be treated in the
same way as armv6s-m, but that's a separate issue.
>From gcc-bugs-return-604295-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 13:37:32 2018
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Subject: [Bug target/84379] Problems with sol2.c GTY handling
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Rainer Orth <ro at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
URL| |https://gcc.gnu.org/ml/gcc-
| |patches/2018-05/msg00466.ht
| |ml
Last reconfirmed| |2018-05-10
Assignee|unassigned at gcc dot gnu.org |ro at gcc dot gnu.org
Target Milestone|--- |9.0
Ever confirmed|0 |1
--- Comment #2 from Rainer Orth <ro at gcc dot gnu.org> ---
Mine, patch posted.
>From gcc-bugs-return-604296-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 13:50:14 2018
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Subject: [Bug target/85733] New: ARM -mbe8 behaviour doesn't match documentation
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Bug ID: 85733
Summary: ARM -mbe8 behaviour doesn't match documentation
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The documentation for the ARM -mbe8 option says "For ARMv6 and later
architectures the default is BE8, for older architectures the default is
BE32.". But in arm-cpus.in it looks like only the ARMv6 fgroup includes the
be8 feature, while ARMv7 and later are based on ARMv6m, which doesn't inherit
ARMv6 and doesn't specify be8 directly. This means that -march=armv8-a (say)
selects BE32 by default.
>From gcc-bugs-return-604297-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 14:01:11 2018
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Subject: [Bug libstdc++/83140] assoc_legendre returns negated value when m is odd
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--- Comment #4 from emsr at gcc dot gnu.org ---
Author: emsr
Date: Thu May 10 13:59:52 2018
New Revision: 260115
URL: https://gcc.gnu.org/viewcvs?rev=260115&root=gcc&view=rev
Log:
2018-05-10 Edward Smith-Rowland <3dw4rd@verizon.net>
PR libstdc++/83140 - assoc_legendre returns negated value when m is odd
* include/tr1/legendre_function.tcc (__assoc_legendre_p): Add __phase
argument defaulted to +1. Doxy comments on same.
* testsuite/special_functions/02_assoc_legendre/
check_assoc_legendre.cc: Regen.
* testsuite/tr1/5_numerical_facilities/special_functions/
02_assoc_legendre/check_tr1_assoc_legendre.cc: Regen.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/tr1/legendre_function.tcc
trunk/libstdc++-v3/testsuite/special_functions/02_assoc_legendre/check_value.cc
trunk/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/02_assoc_legendre/check_value.cc
>From gcc-bugs-return-604298-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 14:32:35 2018
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Subject: [Bug fortran/54613] [F08] Add FINDLOC plus support MAXLOC/MINLOC with KIND=/BACKDate: Thu, 10 May 2018 14:32:00 -0000
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--- Comment #10 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Thu May 10 14:31:54 2018
New Revision: 260116
URL: https://gcc.gnu.org/viewcvs?rev=260116&root=gcc&view=rev
Log:
2018-05-10 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/54613
* intrinsic.texi: Document BACK for MINLOC and MAXLOC.
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/intrinsic.texi
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Subject: [Bug ipa/85655] [8/9 Regression] ICE with -flto and -O2 during IPA pass: cp lto1: internal compiler error: Segmentation fault
Date: Thu, 10 May 2018 14:36:00 -0000
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--- Comment #4 from Martin Jambor <jamborm at gcc dot gnu.org> ---
I have posted a proposed fix to the mailing list:
https://gcc.gnu.org/ml/gcc-patches/2018-05/msg00468.html
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Subject: [Bug tree-optimization/85693] Generation of SAD (Sum of Absolute Difference) instruction
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85693
--- Comment #5 from uros at gcc dot gnu.org ---
Author: uros
Date: Thu May 10 14:50:59 2018
New Revision: 260117
URL: https://gcc.gnu.org/viewcvs?rev=260117&root=gcc&view=rev
Log:
PR target/85693
* config/i386/sse.md (usadv64qi): New expander.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/sse.md
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From: "nsz at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/85729] including c++ headers within extern "C" linkage specification
Date: Thu, 10 May 2018 15:03:00 -0000
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--- Comment #4 from nsz at gcc dot gnu.org ---
(In reply to Jonathan Wakely from comment #3)
> Does that fix it?
yes, thanks.
>From gcc-bugs-return-604302-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 15:05:11 2018
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From: "ryxi at stu dot xidian.edu.cn" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/48200] linking shared library with LTO results in different exported symbols
Date: Thu, 10 May 2018 15:05:00 -0000
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--- Comment #19 from Xi Ruoyao <ryxi at stu dot xidian.edu.cn> ---
I think the best result would be like FMV, for e.g.
int foo(void) __attribute__((symver("@1.1")))
{
return 0;
}
int foo(void) __attribute__((symver("@@1.2")))
{
return 1;
}
Would produce two symbols "foo.symver.1.1" and "foo.symver.1.2", and
.symver foo.symver.1.1 foo@1.1
.symver foo.symver.1.2 foo@@1.2
And we can also use
int foo(void) __attribute__((symver("@1.0"), alias("foo_old")));
But this seems difficult in C FE, it tends to complain the "redefine" of foo -
note that FMV is still only for C++ until now.
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Subject: [Bug c++/82899] *this in constructors could not alias with reference input parameters of the same type
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--- Comment #10 from Marc Glisse <glisse at gcc dot gnu.org> ---
This seems fixed in 8.1 (at least we don't generate the extra mov anymore), can
you check?
>From gcc-bugs-return-604304-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 15:13:57 2018
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Subject: [Bug c++/85715] internal compiler error: in reshape_init_class ( in anonymous union )
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-10
CC| |mpolacek at gcc dot gnu.org
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed with G++ 7; fixed for 8 and 9.
>From gcc-bugs-return-604305-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 15:22:36 2018
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Subject: [Bug c++/85715] internal compiler error: in reshape_init_class ( in anonymous union )
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed by r258585.
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From: "thopre01 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85434] Address of stack protector guard spilled to stack on ARM
Date: Thu, 10 May 2018 15:46:00 -0000
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--- Comment #12 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
(In reply to Thomas Preud'homme from comment #11)
> I've started to work on a new patch according to review feedbacks. I've
> reached the stage where I can compile without -fPIC with the stack protect
> test being an UNSPEC split after register allocation as suggested.
>
> Next steps are:
>
> 1) do the same for the stack protect set (ie setting the canari)
Done
> 3) include the conditional branch in the combined stack protect test to
> ensure the register holding the result of the comparison is not spilled
> before it's used for the conditional branch
Done
> 5) cleanup the patch
In progress
> 2) add support for PIC access to the guard
> 4) clear all registers involved before branching
TODO.
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From: "eggert at gnu dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/85734] New: --suggest-attribute=malloc misdiagnoses static functions
Date: Thu, 10 May 2018 16:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85734
Bug ID: 85734
Summary: --suggest-attribute=malloc misdiagnoses static
functions
Product: gcc
Version: 8.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
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Target Milestone: ---
GCC 8's --suggest-attribute=malloc diagnoses static functions, even though the
malloc attribute is useless for static functions (after all, the compiler has
deduced the property on its own). This is leading to my having to litter code
with '__attribute__ (malloc)' declarations merely to pacify GCC. GCC should
treat the malloc attribute like other attributes (e.g., const), and should
issue the diagnostic only for non-static functions where the attribute is in
fact useful.
This bug report differs from GCC bug 85562, in that this bug is about false
alarms whereas bug 85562 is about the wording of the diagnostics.
Here is an illustration of the bug. For this program:
#include <stdlib.h>
void *pe (void *x) { return x; }
static void *ps (void *x) { return x; }
void *me (size_t n) { return malloc (n); }
static void *ms (size_t n) { return malloc (n); }
int main (void) { return !pe (me (1)) + !ps (ms (2)); }
gcc (GCC) 8.1.1 20180502 (Red Hat 8.1.1-1) x86-64, with the command:
gcc -Wsuggest-attribute=malloc -Wsuggest-attribute=const -O2 -S example.c
outputs the diagnostics at the end of this bug report. GCC correctly diagnoses
'pe' amd 'me', which are extern. GCC is correctly silent for the pure function
'ps', which is static. However, GCC mistakenly diagnoses 'ms', which is also
static.
example.c: In function ‘ms’:
example.c:5:14: warning: function might be candidate for attribute ‘malloc’ if
it is known to return normally [-Wsuggest-attribute=malloc]
static void *ms (size_t n) { return malloc (n); }
^~
example.c: In function ‘pe’:
example.c:2:14: warning: function might be candidate for attribute ‘const’
[-Wsuggest-attribute=const]
void *pe (void *x) { return x; }
^~
example.c: In function ‘me’:
example.c:4:14: warning: function might be candidate for attribute ‘malloc’ if
it is known to return normally [-Wsuggest-attribute=malloc]
void *me (size_t n) { return malloc (n); }
^~
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Subject: [Bug c/85562] -Wsuggest-attribute=malloc misleads about "returning normally"
Date: Thu, 10 May 2018 16:11:00 -0000
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Paul Eggert <eggert at gnu dot org> changed:
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--- Comment #2 from Paul Eggert <eggert at gnu dot org> ---
Also please see GCC bug 85734, which is about false alarms with
-Wsuggest-attribute=malloc.
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/85729] including c++ headers within extern "C" linkage specification
Date: Thu, 10 May 2018 16:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85729
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Great, fixed in trunk then. Let me know if you need it backported, it would be
safe for the branches.
>From gcc-bugs-return-604310-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 16:20:11 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++/85728] strncpy -Wstringop-truncation
Date: Thu, 10 May 2018 16:20:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |msebor at gcc dot gnu.org
Resolution|--- |INVALID
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Please review https://gcc.gnu.org/bugs to see what information GCC bug reports
are expected to include. This one contains none of the requested information.
As far as I can see the warning message reflects the effect of the strncpy call
in the function but the source code printed by the message doesn't correspond
to the source code so it's not clear how the diagnostic messages are related to
the code snippet, or even what it is you are trying to point out. Thus this is
not a valid report.
If you can provide the requested information and explain what you think is
wrong with GCC's output feel free to reopen it.
>From gcc-bugs-return-604312-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 16:25:47 2018
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85735] f951 crashes on empty input
Date: Thu, 10 May 2018 16:25:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-05-10
Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org
Target Milestone|--- |9.0
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I have a patch.
>From gcc-bugs-return-604311-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 16:25:13 2018
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Subject: [Bug fortran/85735] New: f951 crashes on empty input
Date: Thu, 10 May 2018 16:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85735
Bug ID: 85735
Summary: f951 crashes on empty input
Product: gcc
Version: 9.0
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Entering ^D:
$ ./f951 -quiet
f951: Warning: Reading file ‘<stdin>’ as free form
.file "<stdin>"
f951: internal compiler error: Segmentation fault
0xf41544 crash_signal
/home/marek/src/gcc/gcc/toplev.c:325
0xf39315 get_identifier(char const*)
/home/marek/src/gcc/gcc/stringpool.c:95
0x86d423 gfc_create_decls
/home/marek/src/gcc/gcc/fortran/f95-lang.c:195
0x86d45c gfc_be_parse_file
/home/marek/src/gcc/gcc/fortran/f95-lang.c:203
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.
This works though:
$ ./f951 -quiet -
f951: Warning: Reading file ‘<stdin>’ as free form
>From gcc-bugs-return-604313-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 16:29:33 2018
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From: "redbeard0531 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85736] New: Support warn_unused or warn_unused_result on specific constructors
Date: Thu, 10 May 2018 16:29:00 -0000
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Bug ID: 85736
Summary: Support warn_unused or warn_unused_result on specific
constructors
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It would be nice to get the benefits of those attributes on a per-constructor
basis, rather than requiring them on the whole type. The particular use case I
have in mind is for unique_lock's default constructor (or at least on our
wrapper around it). I recently did a code review where someone typed:
std::unique_lock<std::mutex> myMutex;
where they meant to use:
std::unique_lock<std::mutex> lk(myMutex);
There is currently no warning for this at -Wall -Wextra, although thankfully it
is at least caught when myMutex has parentheses around it, which is the more
common mistake. Clearly, it wouldn't make sense to put warn_unused on the whole
unique_lock since the second line is fine.
It would probably make sense on almost all default constructors actually, since
with the exception of a few specific types that alter global or thread-local
state, why are you declaring a default constructed variable then not using it
at all? But on a few types like unique_lock it seems actively dangerous rather
than just simply wasteful.
>From gcc-bugs-return-604314-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 17:03:23 2018
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Subject: [Bug c++/82899] *this in constructors could not alias with reference input parameters of the same type
Date: Thu, 10 May 2018 17:03:00 -0000
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--- Comment #11 from Antony Polukhin <antoshkka at gmail dot com> ---
Seems perfect https://godbolt.org/g/GX3GQd
The mov is not generated for any constructor and the following code:
extern struct A a;
struct A {
int m, n;
A(const A &v);
};
A::A(const A &v) : m(v.m), n((a.m = 1, v.m)) {}
Is not optimized to "A::A(int, const A &v) : m(v.m), n(v.m) { a.m = 1; }"
(which is a mistake).
Are there some tests to make sure that the `mov` won't appear again?
>From gcc-bugs-return-604315-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 17:08:45 2018
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Subject: [Bug c++/85717] anonymous union in initializer list : do not handle the types correctly
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--- Comment #1 from claudio daffra <daffra.claudio at gmail dot com> ---
if swap types, result of compilation changes :
union {
uint64_t integer ;
double real;
} ;
union {
double real;
uint64_t integer ;
} ;
link stack overflow :
https://stackoverflow.com/questions/50260850/anonymous-union-in-initializer-list-do-not-handle-the-types-correctly
>From gcc-bugs-return-604316-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 17:09:54 2018
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Subject: [Bug c++/85717] anonymous union in initializer list : do not handle the types correctly
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--- Comment #2 from claudio daffra <daffra.claudio at gmail dot com> ---
if swap types, result of compilation changes :
union {
uint64_t integer ;
double real;
} ;
union {
double real;
uint64_t integer ;
} ;
link stack overflow :
https://stackoverflow.com/questions/50260850/anonymous-union-in-initializer-list-do-not-handle-the-types-correctly
>From gcc-bugs-return-604317-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 17:35:26 2018
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Subject: [Bug fortran/85737] New: gfortran 8.1.0 false positive with -Wdo-subscript
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85737
Bug ID: 85737
Summary: gfortran 8.1.0 false positive with -Wdo-subscript
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: spapanik21 at gmail dot com
Target Milestone: ---
After the update to gcc-fortran 8.1.0 the following program:
program false_positive
integer, dimension(5, 5) :: matrix = reshape( &
(/ &
32, 63, 93, 53, 69, &
32, 40, 62, 76, 36, &
85, 74, 14, 36, 16, &
16, 23, 57, 15, 54, &
11, 89, 19, 67, 48 &
/), &
shape(matrix), &
order=(/ 2, 1 /) &
)
integer :: i, j, m, n
m = size(matrix, 1)
n = size(matrix, 2)
do i = 1, m
do j = 1, n
if (j > 4) then
print *, matrix(i, j - 3)
end if
end do
end do
end program false_positive
produces the following warning:
stephanos@darwin $ gfortran -Wdo-subscript -c fp.f90
fp.f90:20:35:
fp.f90:18:19:
do j = 1, n
2
fp.f90:20:35:
print *, matrix(i, j - 3)
1
Warning: Array reference at (1) out of bounds (-2 < 1) in loop beginning at (2)
[-Wdo-subscript]
The warning was not present in gcc-fortran 7.3.1
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From: "antoshkka at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/82899] *this in constructors could not alias with reference input parameters of the same type
Date: Thu, 10 May 2018 17:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82899
--- Comment #12 from Antony Polukhin <antoshkka at gmail dot com> ---
(In reply to Marc Glisse from comment #10)
> This seems fixed in 8.1 (at least we don't generate the extra mov anymore),
> can you check?
Actually it still does not work for subobjects. For example
https://godbolt.org/g/zPha3U
Code
struct array {
int d[2];
};
struct test {
array data1;
array data2;
test(const array& t);
};
test::test(const array& t)
: data1{t}
, data2{t}
{}
produces assembly
test::test(array const&):
mov rax, QWORD PTR [rsi]
mov QWORD PTR [rdi], rax
mov rax, QWORD PTR [rsi] <== Not required. Could not alias
mov QWORD PTR [rdi+8], rax
ret
[class.ctor] paragraph 14 also covers this case:
"During the construction of an object, if the value of the object *or any of
its subobjects* is accessed through a glvalue that is not obtained, directly or
indirectly, from the constructor’s this pointer, the value of the object or
subobject thus obtained is unspecified."
Looks like not only `this` should be marked with __restrict, but also all the
subobjects of the type.
>From gcc-bugs-return-604319-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 10 17:41:07 2018
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Subject: [Bug c++/85662] [8/9 Regression] "error: non-constant condition for static assertion" from __builtin_offsetof in C++
Date: Thu, 10 May 2018 17:41:00 -0000
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu May 10 17:40:28 2018
New Revision: 260119
URL: https://gcc.gnu.org/viewcvs?rev=260119&root=gcc&view=rev
Log:
PR c++/85662
* c-common.h (fold_offsetof_1): Removed.
(fold_offsetof): Add TYPE argument defaulted to size_type_node and
CTX argument defaulted to ERROR_MARK.
* c-common.c (fold_offsetof_1): Renamed to ...
(fold_offsetof): ... this. Remove wrapper function. Add TYPE
argument, convert the pointer constant to TYPE and use size_binop
with PLUS_EXPR instead of fold_build_pointer_plus if type is not
a pointer type. Adjust recursive calls.
* c-fold.c (c_fully_fold_internal): Use fold_offsetof rather than
fold_offsetof_1, pass TREE_TYPE (expr) as TYPE to it and drop the
fold_convert_loc.
* c-typeck.c (build_unary_op): Use fold_offsetof rather than
fold_offsetof_1, pass argtype as TYPE to it and drop the
fold_convert_loc.
* cp-gimplify.c (cp_fold): Use fold_offsetof rather than
fold_offsetof_1, pass TREE_TYPE (x) as TYPE to it and drop the
fold_convert.
* g++.dg/ext/offsetof2.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/ext/offsetof2.C
Modified:
trunk/gcc/c-family/ChangeLog
trunk/gcc/c-family/c-common.c
trunk/gcc/c-family/c-common.h
trunk/gcc/c/ChangeLog
trunk/gcc/c/c-fold.c
trunk/gcc/c/c-typeck.c
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/cp-gimplify.c
trunk/gcc/testsuite/ChangeLog
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/85732] use_facet<moneypunct<char, true>>(mylocale) retrieving wrong locale information
Date: Thu, 10 May 2018 17:59:00 -0000
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This isn't a libstdc++ bug, I get the same with a pure C program:
$ cat loc.c
#include <locale.h>
#include <langinfo.h>
#include <stdio.h>
int main()
{
locale_t loc = newlocale(1 << LC_ALL, "en_US.UTF-8", 0);
const char* ccurr = nl_langinfo_l(CURRENCY_SYMBOL, loc);
printf("Currency symbol: %s\n", ccurr);
return 0;
}
$ gcc -D_GNU_SOURCE loc.c
$ ./a.out
Currency symbol: $
$ gcc -D_GNU_SOURCE loc.c -static
$ ./a.out
Currency symbol:
So this seems to be a glibc problem.
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Subject: Dassault SIMULIA Accounts
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* [Bug target/85666] gcc-8.0.1 fails to build mmix target: gcc/libgcc/libgcc2.h:203:20: internal compiler error: in leaf_function_p, at final.c:4488
[not found] <bug-85666-4@http.gcc.gnu.org/bugzilla/>
2018-05-09 0:35 ` [Bug target/85666] gcc-8.0.1 fails to build mmix target: gcc/libgcc/libgcc2.h:203:20: internal compiler error: in leaf_function_p, at final.c:4488 hp at gcc dot gnu.org
@ 2018-05-28 0:07 ` hp at gcc dot gnu.org
1 sibling, 0 replies; 2+ messages in thread
From: hp at gcc dot gnu.org @ 2018-05-28 0:07 UTC (permalink / raw)
To: gcc-bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85666
--- Comment #11 from Hans-Peter Nilsson <hp at gcc dot gnu.org> ---
(In reply to Hans-Peter Nilsson from comment #10)
> Created attachment 44180 [details]
> patch to mmix.c
>
> Builds libgcc. More late this weekend, I hope.
I now see the assertion in assemble_integer alluded to in comment #6 and have
to go chase that down. Commenting out the gcc_assert is not an option.
>From gcc-bugs-return-605794-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 00:22:16 2018
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From: "juergen.reuter at desy dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85942] New: ICE with PDTs
Date: Mon, 28 May 2018 00:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85942
Bug ID: 85942
Summary: ICE with PDTs
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: juergen.reuter at desy dot de
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The following code from c.l.f. thread from Sep 28, 2015. ("Vectors on everyday
physics") leads to an ICE with gfortran 9.0, but works without problems with
ifort 18 and 19, cf. code below.
The expected output would be:
matrix mat_r4: kind = 4
matrix mat_r4: num cols = 2
matrix mat_r4: num rows = 3
a_r4 = 1.000000 2.000000 3.000000 4.000000
5.000000 6.000000
matrix mat_r8: kind = 8
matrix mat_r8: num cols = 4
matrix mat_r8: num rows = 4
a_r8 = 1.00000000000000 2.00000000000000
3.00000000000000 4.00000000000000 5.00000000000000
6.00000000000000 7.00000000000000 8.00000000000000
9.00000000000000 10.0000000000000 11.0000000000000
12.0000000000000 13.0000000000000 14.0000000000000
15.0000000000000 16.0000000000000
Code leading to the segfault:
module mykinds
use, intrinsic :: iso_fortran_env, only : i4 => int32, r4 => real32, r8 =>
real64
implicit none
private
public :: i4, r4, r8
end module mykinds
module matrix
use mykinds, only : r4, r8
implicit none
private
type, public :: mat_t(k,c,r)
private
!.. type parameters
integer, kind :: k = r4
integer, len :: c = 1
integer, len :: r = 1
!.. private by default
!.. type data
real(kind=k) :: m_a(c,r)
end type mat_t
interface assignment(=)
module procedure geta_r4
module procedure seta_r4
module procedure geta_r8
module procedure seta_r8
!.. additional bindings elided
end interface assignment(=)
public :: assignment(=)
contains
subroutine geta_r4(a_lhs, t_rhs)
real(r4), allocatable, intent(out) :: a_lhs(:,:)
class(mat_t(k=r4,c=*,r=*)), intent(in) :: t_rhs
a_lhs = t_rhs%m_a
return
end subroutine geta_r4
subroutine geta_r8(a_lhs, t_rhs)
real(r8), allocatable, intent(out) :: a_lhs(:,:)
class(mat_t(k=r8,c=*,r=*)), intent(in) :: t_rhs
a_lhs = t_rhs%m_a
return
end subroutine geta_r8
subroutine seta_r4(t_lhs, a_rhs)
class(mat_t(k=r4,c=*,r=*)), intent(inout) :: t_lhs
real(r4), intent(in) :: a_rhs(:,:)
!.. checks on size elided
t_lhs%m_a = a_rhs
return
end subroutine seta_r4
subroutine seta_r8(t_lhs, a_rhs)
class(mat_t(k=r8,c=*,r=*)), intent(inout) :: t_lhs
real(r8), intent(in) :: a_rhs(:,:)
!.. checks on size elided
t_lhs%m_a = a_rhs
return
end subroutine seta_r8
end module matrix
program p
use mykinds, only : r4, r8
use matrix, only : mat_t, assignment(=)
implicit none
type(mat_t(k=r4,c=:,r=:)), allocatable :: mat_r4
type(mat_t(k=r8,c=:,r=:)), allocatable :: mat_r8
real(r4), allocatable :: a_r4(:,:)
real(r8), allocatable :: a_r8(:,:)
integer :: N
integer :: M
integer :: i
integer :: istat
N = 2
M = 3
allocate( mat_t(k=r4,c=N,r=M) :: mat_r4, stat=istat )
if ( istat /= 0 ) then
print *, " error allocating mat_r4: stat = ", istat
stop
end if
print *, " matrix mat_r4: kind = ", mat_r4%k
print *, " matrix mat_r4: num cols = ", mat_r4%c
print *, " matrix mat_r4: num rows = ", mat_r4%r
mat_r4 = reshape( [ (real(i, kind=mat_r4%k), i=1,N*M) ], [ N, M ] )
a_r4 = mat_r4
print *, " a_r4 = ", a_r4
N = 4
M = 4
allocate( mat_t(k=r8,c=N,r=M) :: mat_r8, stat=istat )
if ( istat /= 0 ) then
print *, " error allocating mat_r4: stat = ", istat
stop
end if
print *, " matrix mat_r8: kind = ", mat_r8%k
print *, " matrix mat_r8: num cols = ", mat_r8%c
print *, " matrix mat_r8: num rows = ", mat_r8%r
mat_r8 = reshape( [ (real(i, kind=mat_r8%k), i=1,N*M) ], [ N, M ] )
a_r8 = mat_r8
print *, " a_r8 = ", a_r8
deallocate( mat_r4, stat=istat )
if ( istat /= 0 ) then
print *, " error deallocating mat_r4: stat = ", istat
stop
end if
deallocate( mat_r8, stat=istat )
if ( istat /= 0 ) then
print *, " error deallocating mat_r4: stat = ", istat
stop
end if
stop
end program p
>From gcc-bugs-return-605795-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 03:26:53 2018
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Subject: [Bug c++/85943] New: Template function permits outside access to private variable
Date: Mon, 28 May 2018 03:26:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85943
Bug ID: 85943
Summary: Template function permits outside access to private
variable
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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This probably should be classified under meta-bug
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59002
See this example on Godbolt's compiler explorer: https://godbolt.org/g/skvWAt
If the accessing function were not a template function, then GCC correctly
prevents the private access.
If the private member was a function instead of a variable, then GCC correctly
prevents the private access, but only upon instantiation.
Note: in all of these cases, clang will not compile, regardless of whether
there's been an instantiation of the template.
>From gcc-bugs-return-605796-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 04:03:46 2018
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Subject: [Bug target/85915] ABI incompatibility (multiple definition of `__x86_return_thunk') for static libraries, between GCC 7.3.0 and GCC >=7.4.0, caused by -mfunction-return=thunk
Date: Mon, 28 May 2018 04:03:00 -0000
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Arfrever Frehtes Taifersar Arahesis <Arfrever.FTA at GMail dot Com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|ABI incompatibility |ABI incompatibility
|(multiple definition of |(multiple definition of
|`__x86_return_thunk') |`__x86_return_thunk') for
|between GCC 7.3.0 and GCC |static libraries, between
|>=7.4.0 caused by |GCC 7.3.0 and GCC >=7.4.0,
|-mfunction-return=thunk |caused by
| |-mfunction-return=thunk
--- Comment #8 from Arfrever Frehtes Taifersar Arahesis <Arfrever.FTA at GMail dot Com> ---
It seems that this ABI incompatibility affects all static libraries, not just
libc_nonshared.a.
>From gcc-bugs-return-605797-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 04:22:14 2018
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Subject: [Bug c++/85943] Template function permits outside access to private variable
Date: Mon, 28 May 2018 04:22:00 -0000
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--- Comment #1 from Anthony Chuah <achuah at drwsg dot com> ---
Clarifications:
This bug applies to static variables, not non-static ones.
Please use this example instead: https://godbolt.org/g/LzrzDj
>From gcc-bugs-return-605798-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 04:36:36 2018
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Subject: [Bug c++/85944] New: Address of member variable of temporary not considered constexpr at global scope
Date: Mon, 28 May 2018 04:36:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85944
Bug ID: 85944
Summary: Address of member variable of temporary not considered
constexpr at global scope
Product: gcc
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When compiling the following code in C++11, C++14, C++17, or C++2a with 8.1 or
trunk (not tested with earlier versions):
struct S {
int x = 0;
};
constexpr bool f(S const & s) {
return &s.x;
}
constexpr auto x = f(S{});
gcc gives this error message:
<source>:6:12: error: '((&<anonymous>.S::x) != 0)' is not a constant expression
return &s.x;
^
Compiler returned: 1
Putting the declaration of `x` inside a function rather than at global scope
fixes the error, as does creating a constexpr variable to store the result of
`S{}` and then passing that to `f`.
>From gcc-bugs-return-605799-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 05:13:27 2018
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Subject: [Bug c++/85943] Template function permits derived class access to private base class static variable
Date: Mon, 28 May 2018 05:13:00 -0000
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Anthony Chuah <achuah at drwsg dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Template function permits |Template function permits
|outside access to private |derived class access to
|variable |private base class static
| |variable
--- Comment #2 from Anthony Chuah <achuah at drwsg dot com> ---
Apologies for yet another edit: next time I'll make sure to have the
fully-written report before submitting.
The issue appears to be that GCC will permit a derived class access to a
private static variable of its base class.
Please use this repro example instead https://godbolt.org/g/A3zCLk, because it
has a listing of different test cases.
>From gcc-bugs-return-605800-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 06:35:28 2018
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Subject: [Bug target/85939] -mstackrealign does not realign stack with local __m64 variable
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--- Comment #7 from Florian Weimer <fw at gcc dot gnu.org> ---
(In reply to H.J. Lu from comment #6)
> I believe __m64 is 4-byte aligned.
https://github.com/hjl-tools/x86-psABI/blob/801352a1470ae8542a3a1f83fb2abda35feab075/low-level-sys-info.tex#L108
says alignment is 8 bytes. Is it a bug in the ABI document?
>From gcc-bugs-return-605801-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 06:38:28 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85943] Template function permits derived class access to private base class static variable
Date: Mon, 28 May 2018 06:38:00 -0000
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allan.chandler at dti dot com.au changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |allan.chandler at dti dot com.au
--- Comment #3 from allan.chandler at dti dot com.au ---
For what it's worth, the following minimal program is enough to demonstrate the
erroneous behaviour:
class Base {
static constexpr int PRIVATE = 42;
};
struct Derived : public Base {
template <class T> int bar(T) {
return PRIVATE;
}
};
int main() {
Derived d;
return d.bar(1);
}
>From gcc-bugs-return-605802-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 06:43:42 2018
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Subject: [Bug target/85945] New: [6/7/8/9 Regression] ICE in resolve_subreg_use, at lower-subreg.c:751
Date: Mon, 28 May 2018 06:43:00 -0000
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Bug ID: 85945
Summary: [6/7/8/9 Regression] ICE in resolve_subreg_use, at
lower-subreg.c:751
Product: gcc
Version: unknown
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Host: x86_64-linux-gnu
Target: s390x-unknown-linux-gnu
Following causes an ICE:
$ s390x-linux-gnu-gcc -c -O1 -march=z13 ice.i
during RTL pass: subreg2
ice.i: In function ‘h’:
ice.i:16:1: internal compiler error: in resolve_subreg_use, at
lower-subreg.c:751
}
^
0x12512d5 resolve_subreg_use
.././../gcc/lower-subreg.c:751
0x125262b decompose_multiword_subregs
.././../gcc/lower-subreg.c:1602
0x125315d execute
.././../gcc/lower-subreg.c:1741
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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/85934] [8/9 Regression] ICE: verify_gimple failed (error: type mismatch in vector pack expression)
Date: Mon, 28 May 2018 06:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85934
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-28
CC| |marxin at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
Target Milestone|--- |8.2
Ever confirmed|0 |1
Known to fail| |8.1.0, 9.0
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with r247048.
>From gcc-bugs-return-605804-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 07:39:37 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85934] [8/9 Regression] ICE: verify_gimple failed (error: type mismatch in vector pack expression)
Date: Mon, 28 May 2018 07:39:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
The issue is that vector lowering does anything to the vectorized code, that
is, a disconnect between what the vectorizer thinks the target can do and what
vector lowering thinks. And then some bug in vector lowering generating sth
"stupid"
for mask vector lowerings. Ah, it runs into
/* If the vector operation is operating on all same vector elements
implement it with a scalar operation and a splat if the target
supports the scalar operation. */
tree srhs1, srhs2 = NULL_TREE;
if ((srhs1 = ssa_uniform_vector_p (rhs1)) != NULL_TREE
&& (rhs2 == NULL_TREE
|| (! VECTOR_TYPE_P (TREE_TYPE (rhs2))
&& (srhs2 = rhs2))
|| (srhs2 = ssa_uniform_vector_p (rhs2)) != NULL_TREE)
/* As we query direct optabs restrict to non-convert operations. */
&& TYPE_MODE (TREE_TYPE (type)) == TYPE_MODE (TREE_TYPE (srhs1)))
{
op = optab_for_tree_code (code, TREE_TYPE (type), optab_scalar);
if (op >= FIRST_NORM_OPTAB && op <= LAST_NORM_OPTAB
&& optab_handler (op, TYPE_MODE (TREE_TYPE (type))) !=
CODE_FOR_nothing)
{
for vector boolean operations to optimize ~{_88,_88...} to {~_88,~_88...}. And
then it ends up doing this to
mask_patt_63.10_95 = VEC_PACK_TRUNC_EXPR <mask__43.8_92, mask__43.8_93>;
but of course this trick doesn't work for that and the optab query is
"confused"
here because the vector mode is QImode and the component mode is QImode as
well.
The easiest fix is to hoist the VECTOR_BOOLEAN_TYPE_P check above this
transform.
>From gcc-bugs-return-605805-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 07:46:54 2018
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Subject: [Bug bootstrap/85922] bootstrapping fails with -O3 because gcc 8.1.0 generates unknown instruction pshufb
Date: Mon, 28 May 2018 07:46:00 -0000
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--- Comment #4 from John Simon <gcc at mailinator dot com> ---
> No, it uses a correct instruction, but you have too old assembler that can't handle it.
I think in this case the "correct" thing to do would be a check of assembler
during configure and either:
1) only generate code that matches the feature set of the assembler
2) error with a reasonable "your system assembler is too old, please update
gas/binutils"
> Wonder how old your assembler is, because this instruction in question is part of SSSE3 and is supported in binutils since 2007.
$ as --version
GNU assembler 2.16.91.0.5 20051219 (SUSE Linux)
Copyright 2005 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License. This program has absolutely no warranty.
This assembler was configured for a target of `i586-suse-linux'.
>From gcc-bugs-return-605806-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 07:49:24 2018
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Subject: [Bug middle-end/85933] [9 Regression] FAIL: gcc.dg/sso/p8.c -O3 -finline-functions (internal compiler error)
Date: Mon, 28 May 2018 07:49:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Target Milestone|--- |9.0
Summary|FAIL: gcc.dg/sso/p8.c -O3 |[9 Regression] FAIL:
|-finline-functions |gcc.dg/sso/p8.c -O3
|(internal compiler error) |-finline-functions
| |(internal compiler error)
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine. We need to restrict ourselves to vectorizable stmts.
>From gcc-bugs-return-605807-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 07:59:57 2018
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Subject: [Bug tree-optimization/85935] [8/9 Regression] [graphite] ICE in extract_affine, at graphite-sese-to-poly.c:287
Date: Mon, 28 May 2018 07:59:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-05-28
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine.
>From gcc-bugs-return-605808-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 08:18:28 2018
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Subject: [Bug middle-end/85929] _GLIBCXX_ASSERTIONS, subscript type mismatch, and std::vector bounds check elimination
Date: Mon, 28 May 2018 08:18:00 -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> ---
VRP sees
long int _16;
size_type count;
count_8 = (size_type) _16;
...
<bb 3> [local count: 593525634]:
# i_4 = PHI <0(2), i_12(6)>
if (i_4 >= count_8)
goto <bb 7>; [11.00%]
else
goto <bb 4>; [89.00%]
<bb 4> [local count: 528237814]:
i_18 = ASSERT_EXPR <i_4, i_4 < count_8>;
_1 = (long unsigned int) i_18;
_21 = (long unsigned int) _16;
...
if (_1 >= _21)
so we could improve things in vrp_evaluate_conditional and friends by looking
not only at the ops but their definitions. But the truncation of _16 to
count_8 makes the desired optimization more complicated... That is,
for > UINT_MAX # of elements the code will infintely loop AFAICS (but it will
not access elements out of bounds).
So somehow we need to enhance the code in VRP that registers additional
asserts to also handle symbolic ranges and thus register not only
i_4 < count_8 but also (long int) i_4 < _16 in a usable form.
>From gcc-bugs-return-605809-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 08:23:41 2018
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Subject: [Bug c++/85940] Address of label breaks ISO C++ program despite non-GNU dialect and pedantic
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-28
Ever confirmed|0 |1
Known to fail| |3.3.6, 3.4.6, 4.8.5, 8.1.0
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. It never worked.
>From gcc-bugs-return-605810-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 08:39:23 2018
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Subject: [Bug fortran/85942] ICE with PDTs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85942
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-28
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. For referece:
f951: internal compiler error: Segmentation fault
0x10d2d57 crash_signal
/space/rguenther/src/gcc-slpcost/gcc/toplev.c:325
0x7ffff6ac693f ???
/usr/src/debug/glibc-2.22/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
0x859a35 gfc_get_pdt_instance(gfc_actual_arglist*, gfc_symbol**,
gfc_actual_arglist**)
/space/rguenther/src/gcc-slpcost/gcc/fortran/decl.c:3461
0x85b10e gfc_match_decl_type_spec(gfc_typespec*, int)
/space/rguenther/src/gcc-slpcost/gcc/fortran/decl.c:3978
0x85e03a gfc_match_data_decl()
/space/rguenther/src/gcc-slpcost/gcc/fortran/decl.c:5796
0x8ead48 match_word
/space/rguenther/src/gcc-slpcost/gcc/fortran/parse.c:65
0x8eb8f9 decode_statement
/space/rguenther/src/gcc-slpcost/gcc/fortran/parse.c:376
0x8f0266 next_free
/space/rguenther/src/gcc-slpcost/gcc/fortran/parse.c:1230
0x8f0807 next_statement
/space/rguenther/src/gcc-slpcost/gcc/fortran/parse.c:1462
0x8f3a95 parse_spec
...
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Subject: [Bug c++/85944] Address of member variable of temporary not considered constexpr at global scope
Date: Mon, 28 May 2018 08:39:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
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Subject: [Bug target/85945] [6/7/8/9 Regression] ICE in resolve_subreg_use, at lower-subreg.c:751
Date: Mon, 28 May 2018 08:39:00 -0000
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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-605813-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 08:58:26 2018
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Subject: [Bug c/85923] invalid code generation when incrementing pointer referenced by pointer
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85923
Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
This is because you are violating strict-aliasing rules by accessing *Ptr
both via char * and unsigned char * which are two different pointer types.
Declaring Ptr as [const] unsigned char * or compiling with -fno-strict-aliasing
fixes your code.
>From gcc-bugs-return-605814-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 08:59:36 2018
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Subject: [Bug sanitizer/85924] [6 Regression] ASAN: segfault in __interceptor_clock_gettime ( because 'asan_linux.o' for libasan.a built with -DPIC )
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |build
Known to work| |4.9.4, 5.5.0, 7.3.1
Version|unknown |6.4.1
Target Milestone|--- |6.5
Known to fail| |6.4.1
>From gcc-bugs-return-605815-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 09:26:29 2018
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Subject: [Bug tree-optimization/85929] _GLIBCXX_ASSERTIONS, subscript type mismatch, and std::vector bounds check elimination
Date: Mon, 28 May 2018 09:26:00 -0000
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--- Comment #3 from Florian Weimer <fw at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #2)
> That is,
> for > UINT_MAX # of elements the code will infintely loop AFAICS (but it will
> not access elements out of bounds).
The way I read the original source code, the code will simply not touch all the
vector elements in that case (but there is still no out-of-bounds access).
>From gcc-bugs-return-605816-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 09:57:52 2018
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From: "ro at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85946] New: [9 regression] gcc.target/i386/avx512vl-vcvtudq2ps-2.c FAILs
Date: Mon, 28 May 2018 09:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85946
Bug ID: 85946
Summary: [9 regression] gcc.target/i386/avx512vl-vcvtudq2ps-2.c
FAILs
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
CC: ubizjak at gmail dot com
Target Milestone: ---
Target: i386-pc-solaris2.11, amd64-pc-solaris2.11
Between 20180522 (r260539) and 20180523 (r260615),
gcc.target/i386/avx512vl-vcvtudq2ps-2.c
started to FAIL on Solaris 11/x86 with /bin/as (64-bit only):
+FAIL: gcc.target/i386/avx512vl-vcvtudq2ps-2.c (test for excess errors)
+UNRESOLVED: gcc.target/i386/avx512vl-vcvtudq2ps-2.c compilation failed to
produce executable
Excess errors:
Assembler: avx512vl-vcvtudq2ps-2.c
"/var/tmp//ccpfakpd.s", line 139 : Invalid instruction argument
Near line: " vcvtusi2ss -176(%rbp,%rax), %xmm0, %xmm0"
Rainer
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Subject: [Bug target/85946] [9 regression] gcc.target/i386/avx512vl-vcvtudq2ps-2.c FAILs
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Rainer Orth <ro at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug tree-optimization/85947] gcc.dg/vect/bb-slp-div-1.c XPASSes
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Rainer Orth <ro at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug tree-optimization/85947] New: gcc.dg/vect/bb-slp-div-1.c XPASSes
Date: Mon, 28 May 2018 10:02:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85947
Bug ID: 85947
Summary: gcc.dg/vect/bb-slp-div-1.c XPASSes
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
CC: rsandifo at gcc dot gnu.org
Target Milestone: ---
Target: sparc-sun-solaris2.*
Created attachment 44193
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44193&action=edit
32-bit sparc-sun-solaris2.11 bb-slp-div-1.c.171t.slp2
The new gcc.dg/vect/bb-slp-div-1.c test XPASSes on Solaris/SPARC:
+XPASS: gcc.dg/vect/bb-slp-div-1.c -flto -ffat-lto-objects scan-tree-dump slp2
"basic block vectorized"
+XPASS: gcc.dg/vect/bb-slp-div-1.c scan-tree-dump slp2 "basic block vectorized"
both 32 and 64-bit.
>From gcc-bugs-return-605820-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 10:13:35 2018
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85535] bogus code in decl2.c:decl_needed_p
Date: Mon, 28 May 2018 10:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85535
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Looking into it: just matter of using DECL_ATTRIBUTES (decl)?
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Subject: [Bug libfortran/85906] Conditional jump depends on uninitialized value in write_decimal / write_integer
Date: Mon, 28 May 2018 10:17:00 -0000
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--- Comment #8 from Jan Niklas Hasse <jhasse at bixense dot com> ---
Thanks! If I understand it correctly this will go into 8.1.2?
>From gcc-bugs-return-605822-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 10:18:24 2018
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Subject: [Bug target/85946] [9 regression] gcc.target/i386/avx512vl-vcvtudq2ps-2.c FAILs
Date: Mon, 28 May 2018 10:18:00 -0000
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--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
There is nothing wrong with the insn mnemonic, it converts SImode value from
memory to SFmode float register. This insn is different from vcvtusi2ssq.
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Subject: [Bug tree-optimization/85934] [8 Regression] ICE: verify_gimple failed (error: type mismatch in vector pack expression)
Date: Mon, 28 May 2018 10:29:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |9.0
Summary|[8/9 Regression] ICE: |[8 Regression] ICE:
|verify_gimple failed |verify_gimple failed
|(error: type mismatch in |(error: type mismatch in
|vector pack expression) |vector pack expression)
Known to fail|9.0 |
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk sofar.
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Subject: [Bug tree-optimization/85934] [8/9 Regression] ICE: verify_gimple failed (error: type mismatch in vector pack expression)
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon May 28 10:28:38 2018
New Revision: 260847
URL: https://gcc.gnu.org/viewcvs?rev=260847&root=gcc&view=rev
Log:
2018-05-28 Richard Biener <rguenther@suse.de>
PR tree-optimization/85934
* tree-vect-generic.c (expand_vector_operations_1): Hoist
vector boolean check before scalar optimization.
* gcc.target/i386/pr85934.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.target/i386/pr85934.c
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vect-generic.c
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Subject: [Bug middle-end/85933] [9 Regression] FAIL: gcc.dg/sso/p8.c -O3 -finline-functions (internal compiler error)
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug middle-end/85933] [9 Regression] FAIL: gcc.dg/sso/p8.c -O3 -finline-functions (internal compiler error)
Date: Mon, 28 May 2018 10:32:00 -0000
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon May 28 10:31:46 2018
New Revision: 260848
URL: https://gcc.gnu.org/viewcvs?rev=260848&root=gcc&view=rev
Log:
2018-05-28 Richard Biener <rguenther@suse.de>
PR tree-optimization/85933
* tree-vect-data-refs.c (vect_record_base_alignments): Only
look at stmts marked as vectorizable.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/tree-vect-data-refs.c
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Subject: [Bug target/85946] [9 regression] gcc.target/i386/avx512vl-vcvtudq2ps-2.c FAILs
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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> ---
ICC accepts it as well. objdump disassembles it to (also showing the insn
itself):
0: 62 f1 7e 08 7b 44 05 vcvtusi2ss -0xb0(%rbp,%rax,1),%xmm0,%xmm0
7: d4
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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85535] bogus code in decl2.c:decl_needed_p
Date: Mon, 28 May 2018 10:43:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85535
--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> Looking into it: just matter of using DECL_ATTRIBUTES (decl)?
The code is unreachable since the compiler would stop if it was reached.
>From gcc-bugs-return-605829-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 11:01:47 2018
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85535] bogus code in decl2.c:decl_needed_p
Date: Mon, 28 May 2018 11:01:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hubicka at ucw dot cz
--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> ---
I don't understand, sorry. This isn't the same issue, is it? The initial issue
was that we don't want to pass the naked decl to lookup_attribute. Then, what
else? Anyway, this code got added with this patch (r218769):
https://gcc.gnu.org/ml/gcc-patches/2014-12/msg01195.html
Let's add Honza in CC.
>From gcc-bugs-return-605830-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 11:07:15 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++/85535] bogus code in decl2.c:decl_needed_p
Date: Mon, 28 May 2018 11:07:00 -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> ---
Ah, Ok, I think I understand now. You mean, for our testsuite:
DECL_REALLY_EXTERN (decl)
&& ((TREE_CODE (decl) != FUNCTION_DECL
&& !optimize)
|| (TREE_CODE (decl) == FUNCTION_DECL
&& !opt_for_fn (decl, optimize)))
is always false. Then does that mean we have another bug, ie the condition is
wrong, or more trivially that we aren't exercising the optimization?? Honza
unfortunately didn't add any testcases at the time...
>From gcc-bugs-return-605831-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 11:10:26 2018
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Subject: [Bug c++/85535] bogus code in decl2.c:decl_needed_p
Date: Mon, 28 May 2018 11:10:00 -0000
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--- Comment #6 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Yes, I would just remove the entire block.
>From gcc-bugs-return-605832-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 11:35:00 2018
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Subject: [Bug c/85948] New: printf format attribute warning line carat inaccurate
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85948
Bug ID: 85948
Summary: printf format attribute warning line carat inaccurate
Product: gcc
Version: 8.1.0
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main
Reproduced in 8.1 and 5.4
1. I noticed the line carat 9 below is not accurate for the printf format
specifier
2. The later two also has missing carat lines.
3. Output below, and then expected output aafter
Output:
$ gcc -o main main.c -Wall -Werror -Wconversion
main.c: In function ‘main’:
main.c:19:9: error: format ‘%s’ expects argument of type ‘char *’, but argument
2 has type ‘int’ [-Werror=format=]
str_fmt("%s %zu %s %s", d, str, str, d);
^
main.c:19:9: error: format ‘%zu’ expects argument of type ‘size_t’, but
argument 3 has type ‘const char *’ [-Werror=format=]
main.c:19:9: error: format ‘%s’ expects argument of type ‘char *’, but argument
5 has type ‘int’ [-Werror=format=]
cc1: all warnings being treated as errors
Expected:
$ gcc -o main main.c -Wall -Werror -Wconversion
main.c: In function ‘main’:
main.c:19:10: error: format ‘%s’ expects argument of type ‘char *’, but
argument 2 has type ‘int’ [-Werror=format=]
str_fmt("%s %zu %s %s", d, str, str, d);
^
main.c:19:13: error: format ‘%zu’ expects argument of type ‘size_t’, but
argument 3 has type ‘const char *’ [-Werror=format=]
str_fmt("%s %zu %s %s", d, str, str, d);
^
main.c:19:20: error: format ‘%s’ expects argument of type ‘char *’, but
argument 5 has type ‘int’ [-Werror=format=]
str_fmt("%s %zu %s %s", d, str, str, d);
^
cc1: all warnings being treated as errors
>From gcc-bugs-return-605833-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 11:46:57 2018
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From: "jg at jguk dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/85949] New: __attribute__ ((format (printf,1,1))); improve error messages
Date: Mon, 28 May 2018 11:46:00 -0000
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Bug ID: 85949
Summary: __attribute__ ((format (printf,1,1))); improve error
messages
Product: gcc
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main
Hello
This is very useful!
Could the build errors be clearer?
I found this online which describes the parameter order
https://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute-Syntax
Also, could the carat be accurate on the output, it is stuck at char 1.
I included two examples (2,3) and (1,1) below
It would actually require (1,2) to compile.
Output:
~$ gcc -o main main.c -Wall -Werror -Wconversion
main.c:7:1: error: format string argument is not a string type
void str_fmt(const char * const format, ...) __attribute__ ((format
(printf,2,3)));
^
jonny@asus:~$ gcc -o main main.c -Wall -Werror -Wconversion
main.c:7:1: error: format string argument follows the args to be formatted
void str_fmt(const char * const format, ...) __attribute__ ((format
(printf,1,1)));
^
Expected:
jonny@asus:~$ gcc -o main main.c -Wall -Werror -Wconversion
main.c:7:1: error: format string argument variadic list follows the args to be
formatted
void str_fmt(const char * const format, ...) __attribute__ ((format
(printf,1,1)));
^
~$ gcc -o main main.c -Wall -Werror -Wconversion
main.c:7:78: error: format string argument ‘2’ is not a string type
void str_fmt(const char * const format, ...) __attribute__ ((format
(printf,2,3)));
^
main.c:7:80: error: format string argument ‘3’ is not present
void str_fmt(const char * const format, ...) __attribute__ ((format
(printf,2,3)));
^
>From gcc-bugs-return-605834-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 11:50:13 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++/85535] bogus code in decl2.c:decl_needed_p
Date: Mon, 28 May 2018 11:50:00 -0000
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--- Comment #7 from Paolo Carlini <paolo.carlini at oracle dot com> ---
I see. Then I guess we need an explicit rationale for doing that, beyond the
evidence that we aren't ICEing: the check first blush looks sensible. At least
that was the case back in 2014, when Jason quickly approved it ;)
>From gcc-bugs-return-605835-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 12:16:42 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++/85535] bogus code in decl2.c:decl_needed_p
Date: Mon, 28 May 2018 12:16:00 -0000
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--- Comment #8 from Paolo Carlini <paolo.carlini at oracle dot com> ---
It seems that for the potentially interesting cases DECL_EXTERNAL is true but
DECL_REALLY_EXTERN is false.
>From gcc-bugs-return-605836-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 12:18:19 2018
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Subject: [Bug target/85945] [6/7/8/9 Regression] ICE in resolve_subreg_use, at lower-subreg.c:751
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Where is the testcase?
>From gcc-bugs-return-605837-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 12:19:14 2018
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Subject: [Bug c++/85535] bogus code in decl2.c:decl_needed_p
Date: Mon, 28 May 2018 12:19:00 -0000
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--- Comment #9 from Jan Hubicka <hubicka at ucw dot cz> ---
The code is intended to avoid specializations that are done only to possibly
inline the function. When not optimizing this only happens for always inlines
and doing so is just waste of effort.
In this case you have method keyed to other compilation unit. I will check what
flags we get in this case.
>From gcc-bugs-return-605838-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 12:20:51 2018
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Subject: [Bug target/85945] [6/7/8/9 Regression] ICE in resolve_subreg_use, at lower-subreg.c:751
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Is missing :)
Here it is:
typedef float b;
typedef b __attribute__((vector_size(16))) c;
typedef union {
c d;
b a[4];
} e;
int f;
b g[4];
void h() {
c d;
e i;
i.d = d;
f = 0;
for (; f < 4; f++)
g[f] = i.a[f];
}
>From gcc-bugs-return-605839-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 12:33:54 2018
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Subject: [Bug c++/85535] bogus code in decl2.c:decl_needed_p
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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----------------------------------------------------------------------------
Assignee|paolo.carlini at oracle dot com |hubicka at ucw dot cz
--- Comment #10 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Thanks Honza. Note that normally (in decl2.c, rtti.c) we call decl_needed_p
*only* when DECL_NOT_REALLY_EXTERN is false or even DECL_EXTERNAL is false!
Thus the check indeed seems redundant.
>From gcc-bugs-return-605840-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 12:34:57 2018
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Subject: [Bug c++/85535] bogus code in decl2.c:decl_needed_p
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--- Comment #11 from Paolo Carlini <paolo.carlini at oracle dot com> ---
I meant of course DECL_NOT_REALLY_EXTERN is true.
>From gcc-bugs-return-605841-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 12:51:18 2018
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Subject: [Bug c++/85535] bogus code in decl2.c:decl_needed_p
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--- Comment #12 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Not sure about the first decl_needed_p call in emit_tinfo_decl.
>From gcc-bugs-return-605842-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 13:13:14 2018
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Subject: [Bug lto/85759] ICE output_profile_summary, at lto-cgraph.c:706 using -profile-use
Date: Mon, 28 May 2018 13:13:00 -0000
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Stefan Talpalaru <stefantalpalaru at yahoo dot com> changed:
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--- Comment #16 from Stefan Talpalaru <stefantalpalaru at yahoo dot com> ---
I found a new case that is unrelated to the use of -fprofile-generate=directory
or the existence of multiple *.gcda files with the same name in different
directories.
The problem appears in Python-2.7.15 when building the extensions with PGO,
using gcc-7.3.0 or gcc-8.1.0 on Gentoo ~amd64:
[...]/cpython-2.7.15/Modules/timemodule.c:1162:1: internal compiler error: in
output_profile_summary, at lto-cgraph.c:705
}
^
Detailed instructions for replicating the ICE:
https://gist.github.com/stefantalpalaru/a1f31b9dff6c2227999e32781741dd01
Serializing the profiling task does not help, nor does adding
-fprofile-update=atomic to the profile generation phase.
>From gcc-bugs-return-605843-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 13:25:08 2018
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Subject: [Bug lto/85759] ICE output_profile_summary, at lto-cgraph.c:706 using -profile-use
Date: Mon, 28 May 2018 13:25:00 -0000
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--- Comment #17 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Stefan Talpalaru from comment #16)
> I found a new case that is unrelated to the use of
> -fprofile-generate=directory or the existence of multiple *.gcda files with
> the same name in different directories.
>
> The problem appears in Python-2.7.15 when building the extensions with PGO,
> using gcc-7.3.0 or gcc-8.1.0 on Gentoo ~amd64:
>
> [...]/cpython-2.7.15/Modules/timemodule.c:1162:1: internal compiler error:
> in output_profile_summary, at lto-cgraph.c:705
> }
> ^
>
> Detailed instructions for replicating the ICE:
> https://gist.github.com/stefantalpalaru/a1f31b9dff6c2227999e32781741dd01
>
> Serializing the profiling task does not help, nor does adding
> -fprofile-update=atomic to the profile generation phase.
I can confirm that, let me dig into it.
>From gcc-bugs-return-605845-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 13:44:57 2018
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Subject: [Bug target/85345] Missing ENDBR in IFUNC resolver
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--- Comment #5 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Mon May 28 13:44:18 2018
New Revision: 260849
URL: https://gcc.gnu.org/viewcvs?rev=260849&root=gcc&view=rev
Log:
Don't mark IFUNC resolver as only called directly
Since IFUNC resolver is called indirectly, don't mark IFUNC resolver as
only called directly. This patch adds ifunc_resolver to cgraph_node,
sets ifunc_resolver for ifunc attribute and checks ifunc_resolver
instead of looking up ifunc attribute.
gcc/
Backport from mainline
2018-05-26 H.J. Lu <hongjiu.lu@intel.com>
PR target/85900
PR target/85345
* varasm.c (assemble_alias): Lookup ifunc attribute on error.
2018-05-24 H.J. Lu <hongjiu.lu@intel.com>
PR target/85900
PR target/85345
* varasm.c (assemble_alias): Check ifunc_resolver only on
FUNCTION_DECL.
2018-05-22 H.J. Lu <hongjiu.lu@intel.com>
PR target/85345
* cgraph.h (cgraph_node::create): Set ifunc_resolver for ifunc
attribute.
(cgraph_node::create_alias): Likewise.
(cgraph_node::get_availability): Check ifunc_resolver instead
of looking up ifunc attribute.
* cgraphunit.c (maybe_diag_incompatible_alias): Likewise.
* varasm.c (do_assemble_alias): Likewise.
(assemble_alias): Likewise.
(default_binds_local_p_3): Likewise.
* cgraph.h (cgraph_node): Add ifunc_resolver.
(cgraph_node::only_called_directly_or_aliased_p): Return false
for IFUNC resolver.
* lto-cgraph.c (input_node): Set ifunc_resolver for ifunc
attribute.
* symtab.c (symtab_node::verify_base): Verify that ifunc_resolver
is equivalent to lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl)).
(symtab_node::binds_to_current_def_p): Check ifunc_resolver
instead of looking up ifunc attribute.
gcc/testsuite/
Backport from mainline
2018-05-24 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
* gcc.target/i386/pr85345.c: Require ifunc support.
2018-05-22 H.J. Lu <hongjiu.lu@intel.com>
PR target/85345
* gcc.target/i386/pr85345.c: New test.
Added:
branches/gcc-8-branch/gcc/testsuite/gcc.target/i386/pr85345.c
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/cgraph.c
branches/gcc-8-branch/gcc/cgraph.h
branches/gcc-8-branch/gcc/cgraphunit.c
branches/gcc-8-branch/gcc/lto-cgraph.c
branches/gcc-8-branch/gcc/symtab.c
branches/gcc-8-branch/gcc/testsuite/ChangeLog
branches/gcc-8-branch/gcc/varasm.c
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From: "hjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85900] [9 Regression] ICEs after revision r260547 on darwin.
Date: Mon, 28 May 2018 13:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85900
--- Comment #9 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Mon May 28 13:44:18 2018
New Revision: 260849
URL: https://gcc.gnu.org/viewcvs?rev=260849&root=gcc&view=rev
Log:
Don't mark IFUNC resolver as only called directly
Since IFUNC resolver is called indirectly, don't mark IFUNC resolver as
only called directly. This patch adds ifunc_resolver to cgraph_node,
sets ifunc_resolver for ifunc attribute and checks ifunc_resolver
instead of looking up ifunc attribute.
gcc/
Backport from mainline
2018-05-26 H.J. Lu <hongjiu.lu@intel.com>
PR target/85900
PR target/85345
* varasm.c (assemble_alias): Lookup ifunc attribute on error.
2018-05-24 H.J. Lu <hongjiu.lu@intel.com>
PR target/85900
PR target/85345
* varasm.c (assemble_alias): Check ifunc_resolver only on
FUNCTION_DECL.
2018-05-22 H.J. Lu <hongjiu.lu@intel.com>
PR target/85345
* cgraph.h (cgraph_node::create): Set ifunc_resolver for ifunc
attribute.
(cgraph_node::create_alias): Likewise.
(cgraph_node::get_availability): Check ifunc_resolver instead
of looking up ifunc attribute.
* cgraphunit.c (maybe_diag_incompatible_alias): Likewise.
* varasm.c (do_assemble_alias): Likewise.
(assemble_alias): Likewise.
(default_binds_local_p_3): Likewise.
* cgraph.h (cgraph_node): Add ifunc_resolver.
(cgraph_node::only_called_directly_or_aliased_p): Return false
for IFUNC resolver.
* lto-cgraph.c (input_node): Set ifunc_resolver for ifunc
attribute.
* symtab.c (symtab_node::verify_base): Verify that ifunc_resolver
is equivalent to lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl)).
(symtab_node::binds_to_current_def_p): Check ifunc_resolver
instead of looking up ifunc attribute.
gcc/testsuite/
Backport from mainline
2018-05-24 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
* gcc.target/i386/pr85345.c: Require ifunc support.
2018-05-22 H.J. Lu <hongjiu.lu@intel.com>
PR target/85345
* gcc.target/i386/pr85345.c: New test.
Added:
branches/gcc-8-branch/gcc/testsuite/gcc.target/i386/pr85345.c
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/cgraph.c
branches/gcc-8-branch/gcc/cgraph.h
branches/gcc-8-branch/gcc/cgraphunit.c
branches/gcc-8-branch/gcc/lto-cgraph.c
branches/gcc-8-branch/gcc/symtab.c
branches/gcc-8-branch/gcc/testsuite/ChangeLog
branches/gcc-8-branch/gcc/varasm.c
>From gcc-bugs-return-605847-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 14:12:55 2018
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Subject: [Bug target/81652] [meta-bug] -fcf-protection=full bugs
Date: Mon, 28 May 2018 14:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81652
Bug 81652 depends on bug 85345, which changed state.
Bug 85345 Summary: Missing ENDBR in IFUNC resolver
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85345
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85345] Missing ENDBR in IFUNC resolver
Date: Mon, 28 May 2018 14:12:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |8.2
--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for GCC 9 and GCC 8.2.
>From gcc-bugs-return-605848-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 14:39:34 2018
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From: "linux at carewolf dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85950] New: Unsafe-math-optimizations regresses optimization using SSE4.1 roundss
Date: Mon, 28 May 2018 14:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85950
Bug ID: 85950
Summary: Unsafe-math-optimizations regresses optimization using
SSE4.1 roundss
Product: gcc
Version: 8.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
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Target Milestone: ---
When SSE4.1 is available, std::floor, std::ceil and their C counterparts are
inlined to being a single roundss instruction.
However if compiled with -Ofast, -ffast-math or -funsafe-math-optimization
specifically, then you instead get a slightly improved version of the much
slower SSE2 implementation of the same functions.
For instance compiling this with -msse4.1:
#include <cmath>
double stdfloor(double a)
{
return std::floor(a);
}
double stdceil(double a)
{
return std::ceil(a);
}
>From gcc-bugs-return-605849-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 14:52:20 2018
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Subject: [Bug rtl-optimization/85950] Unsafe-math-optimizations regresses optimization using SSE4.1 roundss
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--- Comment #1 from Allan Jensen <linux at carewolf dot com> ---
Sorry forget the example above. I will attached the real code that triggers it.
Note it does not trigger with -fno-signed-zeros, -fno-trapping-math,
-fassociative-math and -freciprocal-math, so it is something specific to
unsafe-math-optimizations itself.
>From gcc-bugs-return-605851-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 14:53:21 2018
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Subject: [Bug rtl-optimization/85950] Unsafe-math-optimizations regresses optimization using SSE4.1 roundss
Date: Mon, 28 May 2018 14:53:00 -0000
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--- Comment #2 from Allan Jensen <linux at carewolf dot com> ---
Created attachment 44196
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44196&action=edit
Example
To trigger need both a rounding conversion and a conversion to integer.
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85945] [6/7/8/9 Regression] ICE in resolve_subreg_use, at lower-subreg.c:751
Date: Mon, 28 May 2018 14:53:00 -0000
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think the problem is that validate_subreg etc. has a restriction like:
/* Subregs involving floating point modes are not allowed to
change size. Therefore (subreg:DI (reg:DF) 0) is fine, but
(subreg:SI (reg:DF) 0) isn't. */
but lower-subreg.c doesn't take that into account in:
/* We only try to decompose single word subregs of multi-word
registers. When we find one, we return -1 to avoid iterating
over the inner register.
??? This doesn't allow, e.g., DImode subregs of TImode values
on 32-bit targets. We would need to record the way the
pseudo-register was used, and only decompose if all the uses
were the same number and size of pieces. Hopefully this
doesn't happen much. */
if (outer_words == 1 && inner_words > 1)
{
bitmap_set_bit (decomposable_context, regno);
iter.skip_subrtxes ();
continue;
}
and decompose_register creates concat with a word sized integral pseudos in it.
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Subject: [Bug sanitizer/60892] GCC (libsanitizer) fails to build with Linux 2.6.21 headers.
Date: Mon, 28 May 2018 15:12:00 -0000
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--- Comment #3 from John Simon <gcc at mailinator dot com> ---
Fails here when building GCC 8.1.0, too.
uname -a:
Linux MACHINE 2.6.16.60-0.85.1-bigsmp #1 SMP Thu Mar 17 11:45:06 UTC 2011 i686
i686 i386 GNU/Linux
gcc --version:
gcc (GCC) 4.1.2 20070115 (SUSE Linux)
But: configure now explicit warns:
*** This configuration is not supported in the following subdirectories:
gnattools gotools target-libada target-libhsail-rt target-libgfortran
target-libbacktrace target-libgo target-libffi target-libobjc
target-liboffloadmic target-libsanitizer
steps done:
* download, unpack, build (in source tree) and install gmp, isl, mpfr, mpc (in
that order) to a non-standard (=user) directory
* for each using `./configure --prefix=/some/userdir
"CPATH=/some/userdir/include" "LD_FLAGS=-L/some/userdir/lib"
* using same CPATH for make/make check`
* download and unpack gcc 8.1.0
* apply patch for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85921
* mkdir gcc-8.1.0-build && cd gcc-8.1.0-build
* `../gcc-8.1.0/configure --prefix=/some/userdir --disable-multilib
--enable-languages=c,c++ "CPATH=/some/userdir/include"
"LDFLAGS=-L/some/userdir/lib" "LIBRARY_PATH=/some/userdir/lib"
* nice make -j6 BOOT_CFLAGS='-O2 -march=native' CPATH="/some/userdir/include"
"LIBRARY_PATH=/some/userdir/lib" bootstrap-lean
Workaround (theory, make bootstrap-lean isn't finished yet): add
--disable-libsanitizer to configure.
The solution for "everything seems to work, bootstrapping fails" seems to be to
just check if the missing defines are available during configure of
libsanitizer. A fail during configure is a "clean fail", a compiler error
isn't.
>From gcc-bugs-return-605853-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 15:13:42 2018
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From: "kretz at kde dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/85951] New: make_signed and make_unsigned are incorrect for wchar_t, char16_t, and char32_t
Date: Mon, 28 May 2018 15:13:00 -0000
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Bug ID: 85951
Summary: make_signed and make_unsigned are incorrect for
wchar_t, char16_t, and char32_t
Product: gcc
Version: 9.0
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make_(un)signed_t of char16_t, char32_t, or wchar_t should never be
char16_t/char32_t/wchar_t, just like it is the case for make_signed_t<char>
(which is signed char).
According to http://eel.is/c++draft/basic.fundamental#2 and #3 char16_t,
char32_t, and wchar32_t are neither _signed integer types_ nor _unsigned
integer types_. Therefore, the third outcome in
http://eel.is/c++draft/meta.trans.sign applies: "type names the (un)signed
integer type with smallest rank for which sizeof(T) == sizeof(type), with the
same cv-qualifiers as T".
cf. https://godbolt.org/g/aG4CnD
>From gcc-bugs-return-605854-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 15:14:04 2018
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Subject: [Bug libfortran/85906] Conditional jump depends on uninitialized value in write_decimal / write_integer
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--- Comment #9 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
(In reply to Jan Niklas Hasse from comment #8)
> Thanks! If I understand it correctly this will go into 8.1.2?
Per usual sequence, the next release of the 8 branch will be 8.2. However, some
linux distributions choose to roll patches and do interim sub releases. If you
need quicker, you can choose to build from source. Some guidance can be found
here:
https://gcc.gnu.org/wiki/Guide%20to%20Building%20gcc/gfortran
( I see I need to finish the guide but the more complicated commands are there
)
>From gcc-bugs-return-605855-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 15:18:45 2018
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Subject: [Bug fortran/85942] ICE with PDTs
Date: Mon, 28 May 2018 15:18:00 -0000
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Paul Thomas <pault at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |pault at gcc dot gnu.org
--- Comment #2 from Paul Thomas <pault at gcc dot gnu.org> ---
I have been to busy of late to attend to the problems with PDT. However, a
window is opening up in the second half of June and I will set to work then.
The starting point will be to introduce a pdt descriptor since this is an
essential correction to the implementation. Beyond this, I will do a bit of
triage and work my way through the PRs in priority order.
Thanks for the report.
Paul
>From gcc-bugs-return-605856-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 15:29:17 2018
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Subject: [Bug tree-optimization/85929] _GLIBCXX_ASSERTIONS, subscript type mismatch, and std::vector bounds check elimination
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--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #2)
> So somehow we need to enhance the code in VRP that registers additional
> asserts to also handle symbolic ranges and thus register not only
> i_4 < count_8 but also (long int) i_4 < _16 in a usable form.
(long int) i_4 < _16 may not hold, _16 could easily be negative.
>From gcc-bugs-return-605857-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 15:38:54 2018
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Subject: [Bug objc/50909] Process "#pragma options align=reset" correctly on Mac OS X
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--- Comment #14 from Rudolf <rudolf.chrispens at web dot de> ---
Even if the compiler would just use the workaround with pragma-pack() when he
encounters this specific pragma would be fine. (If there is a warning for
that!)
Some Infomrations:
http://www.msg.ucsf.edu/local/programs/IBM_Compilers/C:C++/html/compiler/ref/rnpgalin.htm
Seems like I will have to use the MAC OS Clang compiler for now...
>From gcc-bugs-return-605858-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 15:50:50 2018
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Subject: [Bug target/85939] -mstackrealign does not realign stack with local __m64 variable
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--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 44197
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44197&action=edit
A patch
>From gcc-bugs-return-605859-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 15:51:22 2018
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Subject: [Bug target/85939] -mstackrealign does not realign stack with local __m64 variable
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--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to H.J. Lu from comment #8)
> Created attachment 44197 [details]
> A patch
Please try this patch.
>From gcc-bugs-return-605860-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 16:14:29 2018
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Subject: [Bug c/69558] [6/7/8/9 Regression] glib2 warning pragmas stopped working
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--- Comment #23 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to David Malcolm from comment #22)
> Assigning this to me in the hope that I'll get to it in gcc 9 stage 1.
It's gcc 9 stage 1 now.
>From gcc-bugs-return-605861-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 16:29:23 2018
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Subject: [Bug target/85945] [6/7/8/9 Regression] ICE in resolve_subreg_use, at lower-subreg.c:751
Date: Mon, 28 May 2018 16:29:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 44198
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44198&action=edit
gcc9-pr85945.patch
Untested fix.
>From gcc-bugs-return-605862-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 17:12:50 2018
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Subject: [Bug fortran/63570] [F2015] Implement 13.7.137 RANDOM INIT (REPEATABLE, IMAGE DISTINCT)
Date: Mon, 28 May 2018 17:12:00 -0000
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--- Comment #2 from kargl at gcc dot gnu.org ---
Patch submitted.
https://gcc.gnu.org/ml/gcc-patches/2018-05/msg01596.html
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From: "david at doublewise dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85944] Address of member variable of temporary not considered constexpr at global scope
Date: Mon, 28 May 2018 17:20:00 -0000
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--- Comment #2 from David Stone <david at doublewise dot net> ---
I have simplified the bug. It does not require a member variable to trigger the
bug, just taking the address of a a temporary bound to a reference function
parameter at global scope:
constexpr bool f(int const & x) {
return &x;
}
constexpr auto x = f(0);
Note that this code does not trigger the bug:
int const & x = 0;
constexpr bool b = &x;
>From gcc-bugs-return-605864-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 17:21:02 2018
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Subject: [Bug c++/85952] New: Bogus -Wunused-but-set-variable warning with array structured binding
Date: Mon, 28 May 2018 17:21:00 -0000
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Bug ID: 85952
Summary: Bogus -Wunused-but-set-variable warning with array
structured binding
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int
foo ()
{
int a[2] = {1, 2}; // { dg-bogus "set but not used" } */
auto [x, y] = a;
return x + y;
}
should not warn, but we handle the array temporary initialization from another
array for structured bindings quite specially.
>From gcc-bugs-return-605865-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 17:47:45 2018
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Subject: [Bug c++/85952] Bogus -Wunused-but-set-variable warning with array structured binding
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 44199
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44199&action=edit
gcc9-pr85952.patch
Untested fix.
>From gcc-bugs-return-605866-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 18:41:32 2018
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Subject: [Bug fortran/85953] New: [6/7/8/9 Regression] ICE in fold_convert_loc, at fold-const.c:2370
Date: Mon, 28 May 2018 18:41:00 -0000
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Bug ID: 85953
Summary: [6/7/8/9 Regression] ICE in fold_convert_loc, at
fold-const.c:2370
Product: gcc
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Affects versions 6 to 9, gfortran-5 works :
$ cat z1.f90
program p
character(:), allocatable :: x(:)
x = [character :: 'a', 'b']
x = ([character :: x, 'c'])
print *, x
end
$ gfortran-5 z1.f90
$ a.out
abc
$ gfortran-9-20180527 -c z1.f90
z1.f90:4:0:
x = ([character :: x, 'c'])
internal compiler error: Segmentation fault
0xba072f crash_signal
../../gcc/toplev.c:325
0x929b80 fold_convert_loc(unsigned int, tree_node*, tree_node*)
../../gcc/fold-const.c:2370
0x7621b0 gfc_alloc_allocatable_for_assignment(gfc_loopinfo*, gfc_expr*,
gfc_expr*)
../../gcc/fortran/trans-array.c:9935
0x786fc5 gfc_trans_assignment_1
../../gcc/fortran/trans-expr.c:10329
0x74af47 trans_code
../../gcc/fortran/trans.c:1828
0x772269 gfc_generate_function_code(gfc_namespace*)
../../gcc/fortran/trans-decl.c:6507
0x701040 translate_all_program_units
../../gcc/fortran/parse.c:6121
0x701040 gfc_parse_file()
../../gcc/fortran/parse.c:6324
0x7480ef gfc_be_parse_file
../../gcc/fortran/f95-lang.c:204
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Subject: [Bug fortran/85953] [6/7/8/9 Regression] ICE in fold_convert_loc, at fold-const.c:2370
Date: Mon, 28 May 2018 18:41:00 -0000
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--- Comment #1 from G. Steinmetz <gscfq@t-online.de> ---
Just for completeness, this variant works :
$ cat z2.f90
program p
character(:), allocatable :: x(:)
x = [character :: 'a', 'b']
x = [character :: x, 'c']
print *, x
end
$ gfortran-9-20180527 z2.f90 -static-libgfortran
$ a.out
abc
>From gcc-bugs-return-605868-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 18:44:24 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85954] New: [8/9 Regression] ICE in make_ssa_name_fn, at tree-ssanames.c:266
Date: Mon, 28 May 2018 18:44:00 -0000
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Bug ID: 85954
Summary: [8/9 Regression] ICE in make_ssa_name_fn, at
tree-ssanames.c:266
Product: gcc
Version: 9.0
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Changed between 20170924 and 20171008, ICE at -O[s123] :
$ cat z1.f90
program p
character(:), allocatable :: z(:)
call s(z)
contains
subroutine s(x)
character(:), allocatable :: x(:)
associate (y => x)
y = ['abc']
end associate
print *, allocated(x), size(x), len(x), x
end
end
$ gfortran-8-20170924 -c z1.f90 -O2
$
$ gfortran-9-20180527 -c z1.f90 -O2
during IPA pass: materialize-all-clones
z1.f90:3:0:
call s(z)
internal compiler error: Segmentation fault
0xba072f crash_signal
../../gcc/toplev.c:325
0xd690a7 make_ssa_name_fn(function*, tree_node*, gimple*, unsigned int)
../../gcc/tree-ssanames.c:266
0xc068ae make_ssa_name
../../gcc/tree-ssanames.h:115
0xc068ae remap_ssa_name
../../gcc/tree-inline.c:241
0xc0ba47 copy_tree_body_r(tree_node**, int*, void*)
../../gcc/tree-inline.c:1091
0xdee123 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, default_hash_traits<tree_node*> >*, tree_node*
(*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*,
hash_set<tree_node*, default_hash_traits<tree_node*> >*))
../../gcc/tree.c:11400
0xdee313 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, default_hash_traits<tree_node*> >*, tree_node*
(*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*,
hash_set<tree_node*, default_hash_traits<tree_node*> >*))
../../gcc/tree.c:11716
0xc061bc remap_type_1
../../gcc/tree-inline.c:574
0xc063b1 remap_type(tree_node*, copy_body_data*)
../../gcc/tree-inline.c:603
0xc061f6 remap_type_1
../../gcc/tree-inline.c:518
0xc063b1 remap_type(tree_node*, copy_body_data*)
../../gcc/tree-inline.c:603
0xc05ff8 remap_type_1
../../gcc/tree-inline.c:421
0xc063b1 remap_type(tree_node*, copy_body_data*)
../../gcc/tree-inline.c:603
0xc0c14b remap_gimple_op_r
../../gcc/tree-inline.c:948
0xdee123 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, default_hash_traits<tree_node*> >*, tree_node*
(*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*,
hash_set<tree_node*, default_hash_traits<tree_node*> >*))
../../gcc/tree.c:11400
0x975a5a walk_gimple_op(gimple*, tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
../../gcc/gimple-walk.c:203
0xc074bc remap_gimple_stmt
../../gcc/tree-inline.c:1767
0xc0813e copy_bb
../../gcc/tree-inline.c:1817
0xc0962a copy_cfg_body
../../gcc/tree-inline.c:2730
0xc0962a copy_body
../../gcc/tree-inline.c:2973
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Subject: [Bug fortran/85954] [8/9 Regression] ICE in make_ssa_name_fn, at tree-ssanames.c:266
Date: Mon, 28 May 2018 18:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85954
--- Comment #1 from G. Steinmetz <gscfq@t-online.de> ---
Assigned directly :
$ cat z2.f90
program p
character(:), allocatable :: z(:)
call s(z)
contains
subroutine s(x)
character(:), allocatable :: x(:)
x = ['abc']
print *, allocated(x), size(x), len(x), x
end
end
$ gfortran-9-20180527 z2.f90 -static-libgfortran
$ a.out
T 1 3 abc
>From gcc-bugs-return-605870-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 18:50:44 2018
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Subject: [Bug c/85955] New: ICE in fold_convert_loc, at fold-const.c:2408
Date: Mon, 28 May 2018 18:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85955
Bug ID: 85955
Summary: ICE in fold_convert_loc, at fold-const.c:2408
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
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Derived from gcc/testsuite/gcc.dg/torture/pr85567.c, ICE at -O[s23] :
$ cat z1.c
extern void sincos(double x, double *sinx, double *cosx);
void apply(void (*f)(double, double *, double *),
double x, double *sinx, double *cosx)
{
f(x, sinx, cosx);
return;
}
void apply_sincos(double x, double **sinx, double **cosx)
{
apply(sincos, x, sinx, cosx);
return;
}
$ gcc-9-20180527 -c z1.c -O2
z1.c: In function 'apply_sincos':
z1.c:10:20: warning: passing argument 3 of 'apply' from incompatible pointer
type [-Wincompatible-pointer-types]
apply(sincos, x, sinx, cosx);
^~~~
z1.c:3:30: note: expected 'double *' but argument is of type 'double **'
double x, double *sinx, double *cosx)
~~~~~~~~^~~~
z1.c:10:26: warning: passing argument 4 of 'apply' from incompatible pointer
type [-Wincompatible-pointer-types]
apply(sincos, x, sinx, cosx);
^~~~
z1.c:3:44: note: expected 'double *' but argument is of type 'double **'
double x, double *sinx, double *cosx)
~~~~~~~~^~~~
during GIMPLE pass: einline
z1.c:5:3: internal compiler error: in fold_convert_loc, at fold-const.c:2408
f(x, sinx, cosx);
^~~~~~~~~~~~~~~~
0x87694f fold_convert_loc(unsigned int, tree_node*, tree_node*)
../../gcc/fold-const.c:2407
0x8d36e5 gimplify_modify_expr
../../gcc/gimplify.c:5580
0x8ca23b gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
../../gcc/gimplify.c:11440
0x8cc586 gimplify_stmt(tree_node**, gimple**)
../../gcc/gimplify.c:6663
0x8cccb7 gimplify_compound_expr
../../gcc/gimplify.c:5889
0x8ca215 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
../../gcc/gimplify.c:11429
0x8cc586 gimplify_stmt(tree_node**, gimple**)
../../gcc/gimplify.c:6663
0x8cc5d2 gimplify_and_add(tree_node*, gimple**)
../../gcc/gimplify.c:441
0x8a51f2 gimplify_and_update_call_from_tree(gimple_stmt_iterator*, tree_node*)
../../gcc/gimple-fold.c:551
0x8ad5aa gimple_fold_builtin
../../gcc/gimple-fold.c:3792
0x8b057b gimple_fold_call
../../gcc/gimple-fold.c:4158
0x8b057b fold_stmt_1
../../gcc/gimple-fold.c:4822
0xb54aef fold_marked_statements
../../gcc/tree-inline.c:4977
0xb5ef79 optimize_inline_calls(tree_node*)
../../gcc/tree-inline.c:5102
0x11bd3c3 early_inliner(function*)
../../gcc/ipa-inline.c:2782
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Subject: [Bug c/85956] New: [9 Regression] ICE in wide_int_to_tree_1, at tree.c:1549
Date: Mon, 28 May 2018 18:53:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85956
Bug ID: 85956
Summary: [9 Regression] ICE in wide_int_to_tree_1, at
tree.c:1549
Product: gcc
Version: 9.0
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Changed between 20180506 and 20180513, ICE at -O[s23].
Derived from gomp/pr85696.c :
$ cat z1.c
void
foo (int n, void *p)
{
int (*a)[n] = (int (*)[n]) p;
#pragma omp parallel shared(a) default(none)
#pragma omp master
a[-1][-1] = 42;
}
$ gcc-9-20180527 -c z1.c -Wall -fopenmp -O1
$
$ gcc-9-20180527 -c z1.c -Wall -fopenmp -O2
'int[
during GIMPLE pass: vrp
In function 'foo._omp_fn.0':
in wide_int_to_tree_1, at tree.c:1549
#pragma omp parallel shared(a) default(none)
^~~
0xd38643 wide_int_to_tree_1
../../gcc/tree.c:1549
0xd38bbb wide_int_to_tree(tree_node*, poly_int<1u,
generic_wide_int<wide_int_ref_storage<false, true> > > const&)
../../gcc/tree.c:1674
0xd38bbb build_int_cst(tree_node*, poly_int<1u, long>)
../../gcc/tree.c:1342
0x701f60 c_pretty_printer::direct_abstract_declarator(tree_node*)
../../gcc/c-family/c-pretty-print.c:582
0x693ef3 c_tree_printer
../../gcc/c/c-objc-common.c:147
0x1257043 pp_format(pretty_printer*, text_info*)
../../gcc/pretty-print.c:1375
0x125004b diagnostic_report_diagnostic(diagnostic_context*, diagnostic_info*)
../../gcc/diagnostic.c:984
0x12504c3 diagnostic_impl
../../gcc/diagnostic.c:1108
0x12508e0 warning_at(unsigned int, int, char const*, ...)
../../gcc/diagnostic.c:1223
0xd18056 vrp_prop::check_array_ref(unsigned int, tree_node*, bool)
../../gcc/tree-vrp.c:4990
0xd247bf vrp_prop::check_array_ref(unsigned int, tree_node*, bool)
../../gcc/tree-vrp.c:4876
0xd247bf check_array_bounds
../../gcc/tree-vrp.c:5090
0xd3e483 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, default_hash_traits<tree_node*> >*, tree_node*
(*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*,
hash_set<tree_node*, default_hash_traits<tree_node*> >*))
../../gcc/tree.c:11400
0x8c26e3 walk_gimple_op(gimple*, tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
../../gcc/gimple-walk.c:221
0xd11cfc check_array_bounds_dom_walker::before_dom_children(basic_block_def*)
../../gcc/tree-vrp.c:5144
0x1145c9f dom_walker::walk(basic_block_def*)
../../gcc/domwalk.c:353
0xd14e1c vrp_prop::check_all_array_refs()
../../gcc/tree-vrp.c:5161
0xd15d8d vrp_prop::vrp_finalize(bool)
../../gcc/tree-vrp.c:6937
0xd250d3 execute_vrp
../../gcc/tree-vrp.c:7010
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From: "juergen.reuter at desy dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85942] ICE with PDTs
Date: Mon, 28 May 2018 19:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85942
--- Comment #3 from Jürgen Reuter <juergen.reuter at desy dot de> ---
Paul, from my side absolutely no urgency. Just stumbled over this example on
c.l.f. and wanted to play a bit.
>From gcc-bugs-return-605873-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 19:06:00 2018
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From: "lukeshu at lukeshu dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85957] New: i686: Integers appear to be different, but compare as equal
Date: Mon, 28 May 2018 19:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85957
Bug ID: 85957
Summary: i686: Integers appear to be different, but compare as
equal
Product: gcc
Version: 7.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
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Created attachment 44200
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44200&action=edit
The preprocessed source
This is a bug that at first looks a bit like a "problems with floating
point numbers" bug. However, my problem is with integers (calculated
from float types) behave inconsistently.
a6 = a.dbl * 1e6;
b6 = b.dbl * 1e6;
printf ("a6 = %llu\n", a6); // prints "1"
printf ("b6 = %llu\n", b6); // prints "0"
printf ("(a6 == b6) = %s\n", (a6 == b6) ? "true" : "false"); // prints
"true"
I understand why floating point math could result in a6 and b6 being
different; my concern is that a6 and b6 (which are integer types)
appear to be different, yet compare as being equal.
This happens on i686 with -O1 and -O2 (but not -O0), and not on
x86-64.
I apologize that my minimal testcase makes use of the glib-2.0
library; I'm having a hard time replicating the problem without it; it
seems GCC optimizing out a variable is key; and removing the library
use makes it not optimize it out.
Here is the output of gcc, including the appropriate version information:
$ gcc -v -save-temps -O1 $(pkg-config --libs --cflags glib-2.0) demo.c -o
demo
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr
--libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --disable-multilib --disable-werror
--enable-checking=release --enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 7.3.1 20180312 (GCC)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O1' '-I' '/usr/include/glib-2.0'
'-I' '/usr/lib/glib-2.0/include' '-o' 'demo' '-mtune=generic'
'-march=pentiumpro'
/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/cc1 -E -quiet -v -I
/usr/include/glib-2.0 -I /usr/lib/glib-2.0/include demo.c -mtune=generic
-march=pentiumpro -O1 -fpch-preprocess -o demo.i
ignoring nonexistent directory
"/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/../../../../i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/glib-2.0
/usr/lib/glib-2.0/include
/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/include
/usr/local/include
/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/include-fixed
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O1' '-I' '/usr/include/glib-2.0'
'-I' '/usr/lib/glib-2.0/include' '-o' 'demo' '-mtune=generic'
'-march=pentiumpro'
/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/cc1 -fpreprocessed demo.i -quiet
-dumpbase demo.c -mtune=generic -march=pentiumpro -auxbase demo -O1 -version -o
demo.s
GNU C11 (GCC) version 7.3.1 20180312 (i686-pc-linux-gnu)
compiled by GNU C version 7.3.1 20180312, GMP version 6.1.2, MPFR
version 4.0.1, MPC version 1.1.0, isl version isl-0.18-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C11 (GCC) version 7.3.1 20180312 (i686-pc-linux-gnu)
compiled by GNU C version 7.3.1 20180312, GMP version 6.1.2, MPFR
version 4.0.1, MPC version 1.1.0, isl version isl-0.18-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: b94f7ca39249d495c6913c6ded8c0b64
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O1' '-I' '/usr/include/glib-2.0'
'-I' '/usr/lib/glib-2.0/include' '-o' 'demo' '-mtune=generic'
'-march=pentiumpro'
as -v -I /usr/include/glib-2.0 -I /usr/lib/glib-2.0/include --32 -o demo.o
demo.s
GNU assembler version 2.30 (i686-pc-linux-gnu) using BFD version (GNU
Binutils) 2.30
COMPILER_PATH=/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/:/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/:/usr/lib/gcc/i686-pc-linux-gnu/:/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/:/usr/lib/gcc/i686-pc-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/:/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O1' '-I' '/usr/include/glib-2.0'
'-I' '/usr/lib/glib-2.0/include' '-o' 'demo' '-mtune=generic'
'-march=pentiumpro'
/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/collect2 -plugin
/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/liblto_plugin.so
-plugin-opt=/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/lto-wrapper
-plugin-opt=-fresolution=demo.res -plugin-opt=-pass-through=-lgcc
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s --build-id
--eh-frame-hdr --hash-style=gnu -m elf_i386 -dynamic-linker /lib/ld-linux.so.2
-pie -o demo /usr/lib/gcc/i686-pc-linux-gnu/7.3.1/../../../Scrt1.o
/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/../../../crti.o
/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/crtbeginS.o
-L/usr/lib/gcc/i686-pc-linux-gnu/7.3.1
-L/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/../../.. -lglib-2.0 demo.o -lgcc
--as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed
/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/crtendS.o
/usr/lib/gcc/i686-pc-linux-gnu/7.3.1/../../../crtn.o
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O1' '-I' '/usr/include/glib-2.0'
'-I' '/usr/lib/glib-2.0/include' '-o' 'demo' '-mtune=generic'
'-march=pentiumpro'
Attached is the preprocessed demo.i file.
>From gcc-bugs-return-605874-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 19:07:43 2018
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Subject: [Bug libstdc++/85951] make_signed and make_unsigned are incorrect for wchar_t, char16_t, and char32_t
Date: Mon, 28 May 2018 19:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85951
Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-05-28
Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I thought I'd fixed this, but my fix for PR 60326 was just wrong.
>From gcc-bugs-return-605876-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 19:10:47 2018
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Subject: [Bug c++/85943] Template function permits derived class access to private base class static variable
Date: Mon, 28 May 2018 19:10:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Anthony Chuah from comment #0)
> This probably should be classified under meta-bug
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59002
It's just a duplicate of one of the existing bugs there.
*** This bug has been marked as a duplicate of bug 58993 ***
>From gcc-bugs-return-605875-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 19:10:46 2018
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Subject: [Bug c++/58993] incorrectly accept access of protected member method from derived class template
Date: Mon, 28 May 2018 19:10:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |achuah at drwsg dot com
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 85943 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-605877-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 19:12:48 2018
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Subject: [Bug c/85957] i686: Integers appear to be different, but compare as equal
Date: Mon, 28 May 2018 19:12:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>(calculated from float types)
Which is exactly just that.
64bit float point does not have 64bit of precision but rather 53bits.
On x86, since it uses 80bit fpu internally and does not round between the
intermediate steps which is why you are getting two different answers.
*** This bug has been marked as a duplicate of bug 323 ***
>From gcc-bugs-return-605878-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 19:13:20 2018
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Subject: [Bug middle-end/323] optimized code gives strange floating point results
Date: Mon, 28 May 2018 19:13:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |lukeshu at lukeshu dot com
--- Comment #205 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 85957 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-605879-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 19:18:16 2018
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Subject: [Bug middle-end/85956] [9 Regression] ICE in wide_int_to_tree_1, at tree.c:1549
Date: Mon, 28 May 2018 19:18:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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Keywords| |openmp
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>From gcc-bugs-return-605880-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 20:02:17 2018
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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85950] Unsafe-math-optimizations regresses optimization using SSE4.1 roundss
Date: Mon, 28 May 2018 20:02:00 -0000
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Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-05-28
Assignee|unassigned at gcc dot gnu.org |ubizjak at gmail dot com
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--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
Created attachment 44201
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44201&action=edit
Proposed patch
Patch that implements round/cvtt combination for SSE4.1 target.
>From gcc-bugs-return-605881-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 20:39:28 2018
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Subject: [Bug c/85957] i686: Integers appear to be different, but compare as equal
Date: Mon, 28 May 2018 20:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85957
Luke Shumaker <lukeshu at lukeshu dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |UNCONFIRMED
Resolution|DUPLICATE |---
--- Comment #2 from Luke Shumaker <lukeshu at lukeshu dot com> ---
I do not believe that this is a duplicate of bug 323. As I wrote:
> As I understand why floating point math could result in a6 and b6 being
> different; my concern is that a6 and b6 (which are integer types)
> appear to be different, yet compare as being equal.
"a6" and "b6" are both variables with types that resolve to "long long unsigned
integer".
printf ("a6 = %llu\n", a6); // prints "a6 = 1"
printf ("b6 = %llu\n", b6); // prints "b6 = 0"
That's fine, I understand that a6 and b6 could be different because of
differing round-off between intermediate steps. That's not my concern.
Note that a6 and b6 have should have concrete values at this point, as we have
printed them.
My concern is the following:
printf ("(a6 == b6) = %s\n",
(a6 == b6) ? "true" : "false"); // prints "(a6 == b6) = true"
That is, the entire output of the POC program is:
a6 = 1
b6 = 0
a6 == b6
I am not concerned that a6 and b6 disagree, or that they are equal. I am
concerned that *both* are true.
>From gcc-bugs-return-605882-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 20:41:44 2018
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From: "jg at jguk dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85958] New: Make const qualifier error clear
Date: Mon, 28 May 2018 20:41:00 -0000
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Bug ID: 85958
Summary: Make const qualifier error clear
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Calling a function with a const int seems to give such an obscure message, can
it be made clearer?
output:
$ g++ -o main main.cpp -Wall -Werror -Wconversion
main.cpp: In function ‘int main()’:
main.cpp:11:25: error: binding ‘const int’ to reference of type ‘int&’ discards
qualifiers
strstripspace(unused);
^
main.cpp:5:6: note: initializing argument 1 of ‘void strstripspace(int&)’
void strstripspace(int & value);
Expected something clearer:
$ g++ -o main main.cpp -Wall -Werror -Wconversion
main.cpp: In function ‘int main()’:
main.cpp:11:25: error: passing ‘const int’ as reference of type ‘int&’ discards
qualifier const
strstripspace(unused);
^
main.cpp:5:6: note: initializing argument 1 of ‘void strstripspace(int&)’
void strstripspace(int & value);
/* g++ -o main main.cpp -Wall -Werror -Wconversion */
#include <string>
void strstripspace(int & value)
{
return;
}
int main()
{
const int unused = 0;
strstripspace(unused);
return 0;
}
>From gcc-bugs-return-605883-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 20:46:45 2018
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Subject: [Bug c++/85959] New: g++ doesn't show second error
Date: Mon, 28 May 2018 20:46:00 -0000
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Bug ID: 85959
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g++ doesn't show both errors in the below example.
Also the carat is not accurate, showing carat 30, should be 20
Output:
$ g++ -o main main.cpp
main.cpp: In function ‘int main()’:
main.cpp:15:30: error: binding ‘const int’ to reference of type ‘int&’ discards
qualifiers
strstripspace(unused, two);
^
main.cpp:5:6: note: initializing argument 1 of ‘void strstripspace(int&,
int&)’
void strstripspace(int & value, int & two)
Expected:
$ g++ -o main main.cpp
main.cpp: In function ‘int main()’:
main.cpp:15:20: error: binding ‘const int’ to reference of type ‘int&’ discards
qualifiers
strstripspace(unused, two);
^
main.cpp:5:6: note: initializing argument 1 of ‘void strstripspace(int&,
int&)’
void strstripspace(int & value, int & two)
main.cpp:15:28: error: binding ‘const int’ to reference of type ‘int&’ discards
qualifiers
strstripspace(unused, two);
^
main.cpp:5:6: note: initializing argument 2 of ‘void strstripspace(int&,
int&)’
void strstripspace(int & value, int & two)
/* g++ -o main main.cpp -Wall -Werror -Wconversion */
#include <string>
void strstripspace(int & value, int & two)
{
return;
}
int main()
{
const int unused = 0;
const int two = 0;
strstripspace(unused, two);
return 0;
}
>From gcc-bugs-return-605884-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 20:52:07 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/82721] [7/8/9 Regression] Error message with corrupted text, sometimes ICE
Date: Mon, 28 May 2018 20:52:00 -0000
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--- Comment #5 from kargl at gcc dot gnu.org ---
(In reply to kargl from comment #3)
> (In reply to G. Steinmetz from comment #0)
> > This snippet (clearly invalid) gives a second error message
> > with randomly corrupted text :
> >
> >
> > $ cat z1.f90
> > program p
> > real :: a, b(4)
> > character(len(c)) :: b
> > end
> >
> >
> > $ gfortran-8-20171022 -c z1.f90
> > z1.f90:3:25:
> >
> > character(len(c)) :: b
> > 1
> > Error: Symbol 'b' at (1) already has basic type of REAL
> > z1.f90:3:13:
> >
> > character(len(c)) :: b
> > 1
> > Error: '\xa8\x8e\x1f\x8e+' at (1) is not a function
>
> Interesting. Must be an OS specific issue.
>
> % gfcx -c r.f90
> r.f90:3:25:
>
> character(len(c)) :: b
> 1
> Error: Symbol 'b' at (1) already has basic type of REAL
> r.f90:3:17:
>
> character(len(c)) :: b
> 1
> Error: 'string' argument of 'len' intrinsic at (1) must be CHARACTER
>
> % valgrind ~/work/libexec/gcc/x86_64-unknown-freebsd12.0/8.0.0/f951 r.f90
> ==68051== Memcheck, a memory error detector
> ==68051== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
> ==68051== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info
> ==68051== Command:
> /mnt/sgk/work/libexec/gcc/x86_64-unknown-freebsd12.0/8.0.0/f951 r.f90
> ==68051==
> --68051-- WARNING: unhandled syscall: 552
> --68051-- You may be able to write your own handler.
> --68051-- Read the file README_MISSING_SYSCALL_OR_IOCTL.
> --68051-- Nevertheless we consider this a bug. Please report
> --68051-- it at http://valgrind.org/support/bug_reports.html.
> --68051-- WARNING: unhandled syscall: 551
> --68051-- You may be able to write your own handler.
> --68051-- Read the file README_MISSING_SYSCALL_OR_IOCTL.
> --68051-- Nevertheless we consider this a bug. Please report
> --68051-- it at http://valgrind.org/support/bug_reports.html.
> Cannot fstat "/usr/local/lib/valgrind/vgpreload_core-amd64-freebsd.so"
> ==68051==
> ==68051== HEAP SUMMARY:
> ==68051== in use at exit: 0 bytes in 0 blocks
> ==68051== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
> ==68051==
So, I looked at this on my i586-*-freebsd system. Internal state seems
to be corrupted. The problem can be avoided by the following patch
Index: resolve.c
===================================================================
--- resolve.c (revision 260808)
+++ resolve.c (working copy)
@@ -2937,16 +2937,23 @@ is_external_proc (gfc_symbol *sym)
/* Figure out if a function reference is pure or not. Also set the name
of the function for a potential error message. Return nonzero if the
function is PURE, zero if not. */
+
static int
pure_stmt_function (gfc_expr *, gfc_symbol *);
static int
pure_function (gfc_expr *e, const char **name)
{
- int pure;
+ int error_count, pure;
gfc_component *comp;
*name = NULL;
+
+ /* If gfortran gets here with an issued error and a BT_UNKNOWN type,
+ something has corrupted internal state. Die instead of an ICE. */
+ gfc_get_errors (NULL, &error_count);
+ if (error_count > 0 && e->ts.type == BT_UNKNOWN)
+ gfc_fatal_error ("Invalid Fortran detected");
if (e->symtree != NULL
&& e->symtree->n.sym != NULL
>From gcc-bugs-return-605885-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 21:17:44 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85957] i686: Integers appear to be different, but compare as equal
Date: Mon, 28 May 2018 21:17:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
There is still rounding errors when it comes to the math you are doing.
*** This bug has been marked as a duplicate of bug 323 ***
>From gcc-bugs-return-605886-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 21:18:28 2018
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Subject: [Bug middle-end/323] optimized code gives strange floating point results
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--- Comment #206 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 85957 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-605887-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 21:26:11 2018
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From: "gianni at scaramanga dot co.uk" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug translation/85960] New: -fipa-pta and ifunc are incompatible
Date: Mon, 28 May 2018 21:26:00 -0000
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Bug ID: 85960
Summary: -fipa-pta and ifunc are incompatible
Product: gcc
Version: unknown
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Created attachment 44202
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44202&action=edit
Minimal example showing the bug
-fipa-pta and ifuncs are incompatible, it looks like ifunc resolved functions
are treated as no-ops which seems to lead to erroneous conclusions about the
possible values of objects pointed to in such a functions parameters.
For example, if an ifunc has a pointer argument and all implementations of that
functions write to the pointed-to object, then we get a warning about that
object being read before being set - which is erroneous. Moreover we end up
with miscompiled code as a result of this.
>From gcc-bugs-return-605888-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 21:40:28 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++/79393] [7/8/9 Regression] cc1plus rejects valid code with noexcept
Date: Mon, 28 May 2018 21:40:00 -0000
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--- Comment #10 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Should this show up as a P1?
>From gcc-bugs-return-605889-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 21:56:09 2018
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From: "jvdelisle at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85840] Memory leak in write.c
Date: Mon, 28 May 2018 21:56:00 -0000
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--- Comment #14 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
Author: jvdelisle
Date: Mon May 28 21:55:31 2018
New Revision: 260851
URL: https://gcc.gnu.org/viewcvs?rev=260851&root=gcc&view=rev
Log:
2018-05-28 Jerry DeLisle <jvdelisle@gcc.gnu.org>
PR libgfortran/85840
* io/write.c (write_real, write_real_g0, write_complex): Use
separate local variables for the float string length.
Modified:
trunk/libgfortran/ChangeLog
trunk/libgfortran/io/write.c
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From: "bki at hacon dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85961] New: scratch register rsi used after function call
Date: Mon, 28 May 2018 22:31:00 -0000
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Bug ID: 85961
Summary: scratch register rsi used after function call
Product: gcc
Version: 7.3.0
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Created attachment 44203
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44203&action=edit
Minimal cpp-File producing the bug
With g++ 7.0.0 and g++ 7.3.0 and compiling the attached file as detailed in the
comments, produces an object file containing the following instruction
sequence:
76: 48 89 c6 mov %rax,%rsi
79: e8 82 ff ff ff callq 0
<_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv.isra.0>
7e: 48 8d 14 06 lea (%rsi,%rax,1),%rdx
According to the System V AMD64 ABI
(https://software.intel.com/sites/default/files/article/402129/mpx-linux64-abi.pdf),
%rsi is a scratch register not preserved across function calls. I therefore
think that this instruction sequence is wrong.
Why is this a problem?
The function which is called does not clobber %rsi itself. But compiling with
'-pg -mfentry' will instrument that function call and allow a user specified
function to clobber %rsi. A call to __fentry__ should not clobber %rsi, since
%rsi is used for parameter passing and must be unchanged when __fentry__
returns. But by temporarily replacing the return address __fentry__ can
instrument the function exit. There, clobbering %rsi (and all other scratch
registers) should be acceptable.
>From gcc-bugs-return-605891-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 22:32:34 2018
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Subject: [Bug c/85957] i686: Integers appear to be different, but compare as equal
Date: Mon, 28 May 2018 22:32:00 -0000
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Vincent Lefèvre <vincent-gcc at vinc17 dot net> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |vincent-gcc at vinc17 dot net
--- Comment #4 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to Andrew Pinski from comment #3)
> There is still rounding errors when it comes to the math you are doing.
Yes, but the issue here is much more serious, and I don't see this bug as a
duplicate (bug 323 is just a cause of this more serious bug).
While it has been accepted that a floating-point variable can be multi-valued
(except in C99/C11 modes), this must not be the case on a variable of integer
type, even though the value of such a variable has been computed from a
floating-point expression: Once a floating-point number has been converted into
an integer type, the value of this integer must be fixed.
>From gcc-bugs-return-605892-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 22:36:38 2018
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Subject: [Bug c/85957] i686: Integers appear to be different, but compare as equal
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--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Try -std=c99 or -fexcess-precision=standard which will get you the behavior you
want.
>From gcc-bugs-return-605893-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 28 23:28:18 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 c/85957] i686: Integers appear to be different, but compare as equal
Date: Mon, 28 May 2018 23:28:00 -0000
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--- Comment #6 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to Andrew Pinski from comment #5)
> Try -std=c99 or -fexcess-precision=standard which will get you the behavior
> you want.
This is not what is documented: "By default, -fexcess-precision=fast is in
effect; this means that operations may be carried out in a wider precision than
the types specified in the source if that would result in faster code, and it
is unpredictable when rounding to the types specified in the source code takes
place."
This means that in
double x = 1.1 * 1.2;
x can be kept with excess precision (typically 64 bits instead of 53) or can be
rounded to double depending on its use.
But here, one has:
unsigned long long a6 = a.dbl * 1e6;
This is no longer just a rounding of a floating-point value, but a conversion
to an integer type. From -fexcess-precision=fast, one cannot decide whether a6
will be 0 or 1, but once the value of a6 has been observed, it should no longer
be allowed to change.
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From: "joshudson at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85962] New: spurious warning on right shift constant > integer in trivially dead code
Date: Tue, 29 May 2018 02:03:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85962
Bug ID: 85962
Summary: spurious warning on right shift constant > integer in
trivially dead code
Product: gcc
Version: 6.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
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spurious warning on right shift constant > integer when code would be
eliminated by optimization step because it is only reachable when the warning
would not occur
Complete code snippet:
typedef unsigned long size_t;
typedef unsigned int uint32_t;
#define SIZE_MAX 0xFFFFFFFFFFFFFFFF
size_t vfunc(uint32_t n)
{
if (n > SIZE_MAX)
return n >> (sizeof(size_t) * 8);
else
return (size_t)n;
}
This senseless function is reduced from a real function in code that can't
assume the size of size_t is large enough to hold uint32_t. Note that n >
SIZE_MAX is not going to happen when compiling for 64 bits and will be
optimized away, but it raises a warning anyway:
eportbug.c: In function ‘vfunc’:
reportbug.c:8:12: warning: right shift count >= width of type
[-Wshift-count-overflow]
return n >> (sizeof(size_t) * 8);
If the code were not optimized away, the shift would not be out of range. I
compile with -O3 to get dead code elimination.
gcc -v:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/6/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 6.3.0-18+deb9u1'
--with-bugurl=file:///usr/share/doc/gcc-6/README.Bugs
--enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-6 --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 --disable-browser-plugin --enable-java-awt=gtk
--enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-6-amd64/jre
--enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-6-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-6-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--with-target-system-zlib --enable-objc-gc=auto --enable-multiarch
--with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --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 6.3.0 20170516 (Debian 6.3.0-18+deb9u1)
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Subject: [Bug c/85962] spurious warning on right shift constant > integer in trivially dead code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85962
--- Comment #1 from Joshua <joshudson at gmail dot com> ---
(first three lines is because you don't want bug reports with external header
files--3 lines is a lot better than all of stdint.h and limits.h)
>From gcc-bugs-return-605896-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 02:10:58 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85962] spurious warning on right shift constant > integer in trivially dead code
Date: Tue, 29 May 2018 02:10:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Resolution|--- |DUPLICATE
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
THis is a dup of bug 4210.
*** This bug has been marked as a duplicate of bug 4210 ***
>From gcc-bugs-return-605897-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 02:11:01 2018
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Subject: [Bug middle-end/4210] should not warning with dead code
Date: Tue, 29 May 2018 02:11:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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CC| |joshudson at gmail dot com
--- Comment #28 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 85962 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-605898-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 04:28:07 2018
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From: "mcortez at airpost dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85963] New: false positive "set but not used" warning [-Wunused-but-set-variable]
Date: Tue, 29 May 2018 04:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85963
Bug ID: 85963
Summary: false positive "set but not used" warning
[-Wunused-but-set-variable]
Product: gcc
Version: 8.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Related to, but not fixed by:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82728
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82799
Getting an annoying false positive "set but not used" warning when compiling
with -Wall
g++ (GCC) 8.1.1 20180502 (Red Hat 8.1.1-1) on Fedora 28. gcc was updated to
whatever the latest version is available in Fedora 28 update repos.
Reduced test case:
template<typename T>
struct foo {
T val, alpha;
foo() : val(0), alpha(0) {}
};
template<typename T>
inline void bar(const foo<T>& A, const foo<T>& B, foo<T>& C) {
const bool use_alpha = true;
const T alpha = use_alpha ? (A.alpha * B.alpha) : T(0);
C.val = A.val * B.val;
C.alpha = alpha;
}
int main() {
foo<double> A,B,C;
bar(A,B,C);
return 0;
}
g++ gccwarn.cpp -o gccwarn -Wall -O2
gccwarn.cpp: In instantiation of ‘void bar(const foo<T>&, const foo<T>&,
foo<T>&) [with T = double]’:
gccwarn.cpp:21:12: required from here
gccwarn.cpp:10:14: warning: variable ‘use_alpha’ set but not used
[-Wunused-but-set-variable]
const bool use_alpha = true;
^~~~~~~~~
>From gcc-bugs-return-605899-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 04:32:42 2018
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Subject: [Bug c++/82728] [8 regression] Incorrect -Wunused-but-set-variable warning with a const
Date: Tue, 29 May 2018 04:32:00 -0000
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Michael Cortez <mcortez at airpost dot net> changed:
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--- Comment #6 from Michael Cortez <mcortez at airpost dot net> ---
(In reply to Jason Merrill from comment #5)
> Fixed.
It seems to be broken again on gcc 8.1:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85963
>From gcc-bugs-return-605900-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 05:06:11 2018
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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85964] New: [8/9 Regression] Compile time hog w/ -O3 -ftracer -fno-guess-branch-probability
Date: Tue, 29 May 2018 05:06:00 -0000
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Bug ID: 85964
Summary: [8/9 Regression] Compile time hog w/ -O3 -ftracer
-fno-guess-branch-probability
Product: gcc
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gcc-9.0.0-alpha20180527 snapshot (r260810) and gcc 8.1 both take inordinate
time when compiling the following snippet w/ -O3 (-Ofast) -ftracer
-fno-guess-branch-probability:
int
px (int t8)
{
int sw;
#pragma GCC unroll 128
for (sw = 0; sw < 128; ++sw)
{
int uu = 8;
do
{
int yq = 8;
do
{
t8 /= (t8 < 2) ? 1 : 3;
--yq;
}
while (yq > 0);
--uu;
}
while (uu > 0);
}
return t8;
}
% timeout 30 gcc-9.0.0-alpha20180527 -O3 -ftracer -fno-guess-branch-probability
-c tzihxwey.c
zsh: exit 124 timeout 30 gcc-9.0.0-alpha20180527 -O3 -ftracer
-fno-guess-branch-probability
Not sure if it is a duplicate of PR69580 or not.
>From gcc-bugs-return-605901-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 05:26:52 2018
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From: "psmith at gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85965] New: G++ gives cryptic error instead of incomplete type
Date: Tue, 29 May 2018 05:26:00 -0000
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Bug ID: 85965
Summary: G++ gives cryptic error instead of incomplete type
Product: gcc
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Compiling code with GCC 8.1 / binutils 2.30 (built locally on GNU/Linux amd64)
which previously compiled and worked OK with GCC 6.2 and 7.3.
I received a very cryptic error that had me running around reworking class
implementations for quite a while before I realized the problem: I had an
incomplete type. I don't know if there's anything G++ could do better here,
but FYI I had this code:
class Bar
{
public:
struct Less
{
bool operator()(const Bar& lhs, const Bar& rhs) const;
bool operator()(const Bar* lhs, const Bar* rhs) const;
};
};
class Biz;
#include <set>
class Foo
{
std::set<const Biz*, Bar::Less> _map;
};
It's not immediately clear that the incomplete Biz class is a problem,
especially in my code which is significantly more complex and crosses multiple
header files, and G++ doesn't give a very helpful (to me) error:
$ g++ -o set.o -c set.cpp
In file included from x86_64-generic-linux-gnu/include/c++/8.1.0/set:60,
from set.cpp:13:
x86_64-generic-linux-gnu/include/c++/8.1.0/bits/stl_tree.h: In instantiation of
'class std::_Rb_tree<const Biz*, const Biz*, std::_Identity<const Biz*>,
Bar::Less, std::allocator<const Biz*> >':
x86_64-generic-linux-gnu/include/c++/8.1.0/bits/stl_set.h:133:17: required
from 'class std::set<const Biz*, Bar::Less>'
set.cpp:17:37: required from here
x86_64-generic-linux-gnu/include/c++/8.1.0/bits/stl_tree.h:452:21: error:
static assertion failed: comparison object must be invocable with two arguments
of key type
static_assert(__is_invocable<_Compare&, const _Key&, const _Key&>{},
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If I had included the complete type for class Biz, the compiler would have seen
that Biz is a subclass of Bar and it would have been fine; adding in the header
file fixed my problem:
class Bar
{
public:
struct Less
{
bool operator()(const Bar& lhs, const Bar& rhs) const;
bool operator()(const Bar* lhs, const Bar* rhs) const;
};
};
class Biz : public Bar
{}
#include <set>
class Foo
{
std::set<const Biz*, Bar::Less> _map;
};
>From gcc-bugs-return-605902-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 09:06:38 2018
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From: "ladis@linux-mips.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libgcc/85967] New: [ARM] No unwinding support for division functions
Date: Tue, 29 May 2018 09:06:00 -0000
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Bug ID: 85967
Summary: [ARM] No unwinding support for division functions
Product: gcc
Version: unknown
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Severity: normal
Priority: P3
Component: libgcc
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__aeabi_idiv is missing unwinding info, so backtrace stops there not providing
information where division by zero happened. Tested with gcc-5.4.0 and
gcc-7.3.1, but given the fact libgcc/config/arm/lib1funcs.S is not receiving
any updates, all gcc versions are affected.
Test case compiled with gcc-5.4.0:
$ arm-v7a-linux-gnueabi-gcc -o test -g -rdynamic -funwind-tables
-fasynchronous-unwind-tables -fno-omit-frame-pointer sigfpe_div0_bt.c
./test
Stack trace:
/lib/libc.so.6(+0x16a66) [0xb6e39a66]
/lib/libc.so.6(gsignal+0x23) [0xb6e47600]
The same test case using gcc-7.3.1 on x86_64:
$ gcc -o test -g -rdynamic -funwind-tables -fasynchronous-unwind-tables
-fno-omit-frame-pointer sigfpe_div0_bt.c
$ ./test
Stack trace:
./test(baz+0x16) [0x55ef13367dd0]
./test(bar+0x15) [0x55ef13367dfe]
./test(foo+0x15) [0x55ef13367e16]
./test(main+0xb8) [0x55ef13367ed1]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7ff3e4402a87]
./test(_start+0x2a) [0x55ef13367b5a]
Using following naive patch in attachment makes things better...
--- a/libgcc/config/arm/lib1funcs.S 2018-05-29 01:20:17.816878829 +0200
+++ b/libgcc/config/arm/lib1funcs.S 2018-05-29 01:28:04.697491881 +0200
@@ -1344,7 +1344,9 @@
ARM_FUNC_START div0
#endif
+ .fnstart
do_push {r1, lr}
+ .save {r1, lr}
mov r0, #SIGFPE
bl SYM(raise) __PLT__
RETLDM r1
@@ -1355,6 +1357,7 @@
#else
FUNC_END div0
#endif
+ .fnend
#endif /* L_dvmd_lnx */
#ifdef L_clear_cache
Stack trace:
/lib/libc.so.6(+0x16a66) [0xb6e19a66]
/lib/libc.so.6(gsignal+0x23) [0xb6e27600]
./test() [0x10eea]
./test(baz+0x13) [0x10b64]
I would welcome if ARM could unwind in this situation too as it makes
backtraces more meaningful given limited environment of typical arm embedded
board.
>From gcc-bugs-return-605903-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 09:10:00 2018
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Subject: [Bug libgcc/85967] [ARM] No unwinding support for division functions
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--- Comment #1 from Ladislav Michl <ladis@linux-mips.org> ---
Created attachment 44205
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44205&action=edit
SIGFPE test case
>From gcc-bugs-return-605904-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 09:22:52 2018
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Subject: [Bug target/85950] Unsafe-math-optimizations regresses optimization using SSE4.1 roundss
Date: Tue, 29 May 2018 09:22:00 -0000
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--- Comment #4 from Allan Jensen <linux at carewolf dot com> ---
Btw, I found this while trying to figure out why std::round() wasn't also
optimized to a single roundss instruction, is that just a missing optimization
or is there a quirk about that that makes them not fit?
I noticed the definition of the ROUND enum in i386.md is even missing the entry
to for normal rounding (0 AFAIK)
>From gcc-bugs-return-605905-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 09:27:41 2018
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Subject: [Bug c++/85958] Make const qualifier error clear
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--- Comment #1 from Jonny Grant <jg at jguk dot org> ---
My idea of what would be clearest is :-
Cannot pass ‘const int‘ as ‘int&‘ (non const)
>From gcc-bugs-return-605906-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 09:32:02 2018
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Subject: [Bug lto/85759] ICE output_profile_summary, at lto-cgraph.c:706 using -profile-use
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--- Comment #18 from Stefan Talpalaru <stefantalpalaru at yahoo dot com> ---
Another clue emerged: the ICE appears only when the same source file is
compiled multiple times.
When building the extensions, Python replaces the boring Makefile with its own
"distutils" build tool that fails to do conditional compilation based on the
source and target modification times.
Since "timemodule.c" is used by 3 different extensions, it's being compiled 3
times in the profile generation phase and this somehow corrupts the
corresponding .gcda file. Once this silly build tool is fixed so it compiles it
a single time, the ICE disappears.
>From gcc-bugs-return-605907-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 09:35:27 2018
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Subject: [Bug c++/85739] [8/9 Regression] internal compiler error: in finish_member_declaration, at cp/semantics.c:3057
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Priority|P3 |P2
CC| |paolo.carlini at oracle dot com
>From gcc-bugs-return-605908-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 09:36:49 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/85759] ICE output_profile_summary, at lto-cgraph.c:706 using -profile-use
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--- Comment #19 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Stefan Talpalaru from comment #18)
> Another clue emerged: the ICE appears only when the same source file is
> compiled multiple times.
>
> When building the extensions, Python replaces the boring Makefile with its
> own "distutils" build tool that fails to do conditional compilation based on
> the source and target modification times.
>
> Since "timemodule.c" is used by 3 different extensions, it's being compiled
> 3 times in the profile generation phase and this somehow corrupts the
> corresponding .gcda file. Once this silly build tool is fixed so it compiles
> it a single time, the ICE disappears.
Yes, I've noticed that as well. Just wanted to inform you.
I've cooked a patch for that prints following:
...
gcc -pthread -fPIC -fno-strict-aliasing -O3 -march=native -pipe -DNDEBUG -g
-fwrapv -O3 -Wall -Wstrict-prototypes -fprofile-generate -flto
-fuse-linker-plugin -ffat-lto-objects -flto-partition=none -I. -IInclude
-I./Include -I/usr/local/include
-I/home/marxin/Programming/testcases/python-lto-ice-v2/playground/cpython-2.7.15/Include
-I/home/marxin/Programming/testcases/python-lto-ice-v2/playground/cpython-2.7.15
-c
/home/marxin/Programming/testcases/python-lto-ice-v2/playground/cpython-2.7.15/Modules/itertoolsmodule.c
-o
build/temp.linux-x86_64-2.7/home/marxin/Programming/testcases/python-lto-ice-v2/playground/cpython-2.7.15/Modules/itertoolsmodule.o
profiling:/home/marxin/Programming/testcases/python-lto-ice-v2/playground/cpython-2.7.15/build/temp.linux-x86_64-2.7/home/marxin/Programming/testcases/python-lto-ice-v2/playground/cpython-2.7.15/Modules/timemodule.gcda:overwriting
an existing profile data with a different timestamp
profiling:exiting after an error
profiling:/home/marxin/Programming/testcases/python-lto-ice-v2/playground/cpython-2.7.15/build/temp.linux-x86_64-2.7/home/marxin/Programming/testcases/python-lto-ice-v2/playground/cpython-2.7.15/Modules/timemodule.gcda:overwriting
an existing profile data with a different timestamp
profiling:exiting after an error
...
Note I also introduced GCOV_EXIT_AT_ERROR env. variable that should be handy
for package builds.
>From gcc-bugs-return-605909-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 09:37:52 2018
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Subject: [Bug lto/85759] ICE output_profile_summary, at lto-cgraph.c:706 using -profile-use
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--- Comment #20 from Martin Liška <marxin at gcc dot gnu.org> ---
Patch candidate:
https://gcc.gnu.org/ml/gcc-patches/2018-05/msg01608.html
>From gcc-bugs-return-605910-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 09:43:12 2018
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Subject: [Bug c/85955] ICE in fold_convert_loc, at fold-const.c:2408
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-29
CC| |marxin at gcc dot gnu.org
Ever confirmed|0 |1
Known to fail| |6.4.0, 7.3.0, 8.1.0, 9.0
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, it's very old, started with GCC 4.6.0.
>From gcc-bugs-return-605911-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 10:10:26 2018
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Subject: [Bug tree-optimization/85964] [8/9 Regression] Compile time hog w/ -O3 -ftracer -fno-guess-branch-probability
Date: Tue, 29 May 2018 10:10:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-29
CC| |ebotcazou at gcc dot gnu.org,
| |law 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> ---
Started when we introduced GCC unroll pragma: r255973. Changing 128 to 32, then
it takes ~5s on a Haswell machine.
time report:
time gcc pr85954.c -c -ftracer -fno-guess-branch-probability -O3 -ftime-report
Time variable usr sys wall
GGC
phase setup : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
1247 kB ( 6%)
phase opt and generate : 5.42 (100%) 0.02 (100%) 5.44 (100%)
21204 kB ( 94%)
phase finalize : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
0 kB ( 0%)
CFG verifier : 0.02 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
0 kB ( 0%)
tree CFG cleanup : 3.40 ( 63%) 0.00 ( 0%) 3.43 ( 63%)
773 kB ( 3%)
tree VRP : 0.01 ( 0%) 0.00 ( 0%) 0.03 ( 1%)
1605 kB ( 7%)
tree copy propagation : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
23 kB ( 0%)
tree PTA : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
0 kB ( 0%)
tree SSA rewrite : 0.02 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 kB ( 0%)
tree SSA incremental : 0.17 ( 3%) 0.00 ( 0%) 0.16 ( 3%)
2336 kB ( 10%)
tree operand scan : 0.00 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
645 kB ( 3%)
dominator optimization : 0.07 ( 1%) 0.01 ( 50%) 0.06 ( 1%)
1834 kB ( 8%)
backwards jump threading : 1.49 ( 27%) 0.00 ( 0%) 1.49 ( 27%)
0 kB ( 0%)
tree FRE : 0.01 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
2 kB ( 0%)
tree loop invariant motion : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 kB ( 0%)
complete unrolling : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
2741 kB ( 12%)
tree vectorization : 0.01 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
1412 kB ( 6%)
tree SSA verifier : 0.03 ( 1%) 0.00 ( 0%) 0.04 ( 1%)
0 kB ( 0%)
tree STMT verifier : 0.03 ( 1%) 0.00 ( 0%) 0.02 ( 0%)
0 kB ( 0%)
tree strlen optimization : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 kB ( 0%)
dominance frontiers : 0.01 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 kB ( 0%)
dominance computation : 0.02 ( 0%) 0.01 ( 50%) 0.01 ( 0%)
0 kB ( 0%)
loop init : 0.04 ( 1%) 0.00 ( 0%) 0.02 ( 0%)
128 kB ( 1%)
CPROP : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
20 kB ( 0%)
tracer : 0.03 ( 1%) 0.00 ( 0%) 0.02 ( 0%)
7352 kB ( 33%)
combiner : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
105 kB ( 0%)
tree loop if-conversion : 0.01 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
663 kB ( 3%)
rest of compilation : 0.01 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
387 kB ( 2%)
repair loop structures : 0.01 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
0 kB ( 0%)
TOTAL : 5.43 0.02 5.45
22612 kB
Extra diagnostic checks enabled; compiler may run slowly.
Configure with --enable-checking=release to disable checks.
real 0m5.468s
user 0m5.441s
sys 0m0.027s
Perf report:
# Overhead Command Shared Object Symbol
# ........ ....... ................
...........................................................................................................................................................................................................
#
31.15% cc1 cc1 [.] et_splay
13.65% cc1 cc1 [.] fsm_find_thread_path
8.80% cc1 cc1 [.] iterate_fix_dominators
4.75% cc1 cc1 [.]
hash_table<default_hash_traits<basic_block_def*>,
xcallocator>::find_empty_slot_for_expand
3.38% cc1 cc1 [.] thread_jumps::handle_phi
2.78% cc1 cc1 [.]
thread_jumps::fsm_find_control_statement_thread_paths
2.70% cc1 cc1 [.] bitmap_set_bit
2.47% cc1 cc1 [.] graphds_dfs
2.33% cc1 cc1 [.] et_root
2.01% cc1 cc1 [.]
hash_table<default_hash_traits<basic_block_def*>, xcallocator>::expand
1.81% cc1 cc1 [.] et_below
1.39% cc1 libc-2.27.so [.] _int_malloc
1.35% cc1 cc1 [.] add_edge
>From gcc-bugs-return-605912-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 10:13:54 2018
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Subject: [Bug middle-end/85956] [9 Regression] ICE in wide_int_to_tree_1, at tree.c:1549
Date: Tue, 29 May 2018 10:13:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-29
CC| |jakub at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
Known to work| |9.0
Ever confirmed|0 |1
Known to fail| |8.1.0
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with r260156.
>From gcc-bugs-return-605913-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 10:18:48 2018
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Subject: [Bug fortran/85954] [8/9 Regression] ICE in make_ssa_name_fn, at tree-ssanames.c:266
Date: Tue, 29 May 2018 10:18:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-29
CC| |marxin at gcc dot gnu.org,
| |pault at gcc dot gnu.org
Ever confirmed|0 |1
Known to fail| |8.1.0, 9.0
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with r253400.
>From gcc-bugs-return-605915-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 10:20:54 2018
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Subject: [Bug fortran/85953] [6/7/8/9 Regression] ICE in fold_convert_loc, at fold-const.c:2370
Date: Tue, 29 May 2018 10:20:00 -0000
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with r228368.
>From gcc-bugs-return-605914-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 10:20:41 2018
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Subject: [Bug fortran/85953] [6/7/8/9 Regression] ICE in fold_convert_loc, at fold-const.c:2370
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Priority|P3 |P4
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>From gcc-bugs-return-605916-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 10:22:29 2018
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Subject: [Bug fortran/85954] [8/9 Regression] ICE in make_ssa_name_fn, at tree-ssanames.c:266
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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> ---
Another case of a missing DECL_EXPR for a variable-size type.
>From gcc-bugs-return-605917-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 10:25:15 2018
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Subject: [Bug target/85950] Unsafe-math-optimizations regresses optimization using SSE4.1 roundss
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--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Allan Jensen from comment #4)
> Btw, I found this while trying to figure out why std::round() wasn't also
> optimized to a single roundss instruction, is that just a missing
> optimization or is there a quirk about that that makes them not fit?
>
> I noticed the definition of the ROUND enum in i386.md is even missing the
> entry to for normal rounding (0 AFAIK)
round() rounds half away from zero, while roundss/roundsd (using normal
rounding) rounds half to even.
>From gcc-bugs-return-605918-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 10:31:46 2018
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Subject: [Bug middle-end/85955] ICE in fold_convert_loc, at fold-const.c:2408
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85955
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Component|c |middle-end
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine as well. We are gimplifying
3791 if (!update_call_from_tree (gsi, result))
3792 gimplify_and_update_call_from_tree (gsi, result);
3793 return true;
(gdb) p debug_generic_expr (result)
*sinx_3(D) = IMAGPART_EXPR <SAVE_EXPR <__builtin_cexpi (x_2(D))>>;, *cosx_4(D)
= REALPART_EXPR <SAVE_EXPR <__builtin_cexpi (x_2(D))>>;
and as part of that failing the store because of the arg mismatch. This is
because gimple_builtin_call_types_compatible_p uses useless_type_conversion_p
and double * and double ** do not require a conversion in GIMPLE.
>From gcc-bugs-return-605920-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 10:32:50 2018
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Subject: [Bug middle-end/85956] [8/9 Regression] ICE in wide_int_to_tree_1, at tree.c:1549
Date: Tue, 29 May 2018 10:32:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|9.0 |8.2
Summary|[9 Regression] ICE in |[8/9 Regression] ICE in
|wide_int_to_tree_1, at |wide_int_to_tree_1, at
|tree.c:1549 |tree.c:1549
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
It actually started with r254830 if you drop the default(none) so that you
don't hit the bug r260156 was fixing.
Not really sure if it is desirable to slow down code at runtime for warnings
though, by forcing passing around array lengths for the cases of pointers to
VLA, even when nothing in the code refers to those temporaries.
The problem is in:
warning_at (location, OPT_Warray_bounds,
"array subscript %E is below array bounds of %qT",
low_sub, artype);
where we've checked that low_bound is INTEGER_CST, but up_bound is
error_mark_node (what the temporary VAR_DECL that doesn't get passed to the
parallel region is replaced with).
So, either we shouldn't try to print %qT in this case, at least when up_bound
is error_mark_node, or the type printing should handle the case of
error_mark_node bounds gracefully (say print it as [] rather than crash), or
perhaps omp expansion could just try to replace these error_mark_node array
bounds with NULLs somewhere (no idea if that is actually possible though).
>From gcc-bugs-return-605919-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 10:32:36 2018
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Subject: [Bug tree-optimization/85964] [8/9 Regression] Compile time hog w/ -O3 -ftracer -fno-guess-branch-probability
Date: Tue, 29 May 2018 10:32:00 -0000
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--- Comment #2 from Arseny Solokha <asolokha at gmx dot com> ---
The original testcase looked like this:
int t8;
void
il (void)
{
int uu = 8;
do
{
int yq = 8;
do
{
t8 /= (t8 < 2) ? 1 : 3;
--yq;
}
while (yq > 0);
--uu;
}
while (uu > 0);
}
int
px (int t8)
{
il (); il (); il (); il (); il (); il (); il (); il ();
il (); il (); il (); il (); il (); il (); il (); il ();
il (); il (); il (); il (); il (); il (); il (); il ();
il (); il (); il (); il (); il (); il (); il (); il ();
il (); il (); il (); il (); il (); il (); il (); il ();
il (); il (); il (); il (); il (); il (); il (); il ();
il (); il (); il (); il (); il (); il (); il (); il ();
il (); il (); il (); il (); il (); il (); il (); il ();
il (); il (); il (); il (); il (); il (); il (); il ();
il (); il (); il (); il (); il (); il (); il (); il ();
il (); il (); il (); il (); il (); il (); il (); il ();
il (); il (); il (); il (); il (); il (); il (); il ();
il (); il (); il (); il (); il (); il (); il (); il ();
il (); il (); il (); il (); il (); il (); il (); il ();
il (); il (); il (); il (); il (); il (); il (); il ();
il (); il (); il (); il (); il (); il (); il (); il ();
}
I've only replaced 128 distinct function calls w/ to-be-unrolled loop to save
some space. And gcc 8 and 9 still take much more time to compile this one than
earlier gcc branches.
>From gcc-bugs-return-605921-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 10:36:49 2018
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Subject: [Bug ipa/85960] -fipa-pta and ifunc are incompatible
Date: Tue, 29 May 2018 10:36:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-05-29
CC| |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Please specify the GCC version and architecture you are using. I cannot
reproduce this on x86_64-linux with 4.8.5, 4.9.4, 5.5, 6.4, 7.3, 8.1 or current
trunk.
>From gcc-bugs-return-605922-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 10:37:29 2018
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Subject: [Bug fortran/85953] [6/7/8/9 Regression] ICE in fold_convert_loc, at fold-const.c:2370
Date: Tue, 29 May 2018 10:37:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-29
Known to work| |5.5.0
Ever confirmed|0 |1
Known to fail| |6.4.0, 7.3.0, 8.1.0, 9.0
>From gcc-bugs-return-605923-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 10:50:18 2018
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Subject: [Bug tree-optimization/85964] [8/9 Regression] Compile time hog w/ -O3 -ftracer -fno-guess-branch-probability
Date: Tue, 29 May 2018 10:50:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |8.2
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Maintaining dominators is costly.
diff --git a/gcc/dominance.c b/gcc/dominance.c
index 20671983f98..5ba765c82be 100644
--- a/gcc/dominance.c
+++ b/gcc/dominance.c
@@ -1475,6 +1475,8 @@ iterate_fix_dominators (enum cdi_direction dir,
vec<basic_block> bbs,
return;
}
+ timevar_push (TV_DOMINANCE);
+
/* Construct the graph G. */
hash_map<basic_block, int> map (251);
FOR_EACH_VEC_ELT (bbs, i, bb)
@@ -1537,6 +1539,8 @@ iterate_fix_dominators (enum cdi_direction dir,
vec<basic_block> bbs,
free (parent);
free_graph (g);
+
+ timevar_pop (TV_DOMINANCE);
}
void
shows
backwards jump threading : 9.02 ( 37%) 0.00 ( 0%) 9.01 ( 37%)
0 kB ( 0%)
dominance computation : 9.89 ( 40%) 0.01 ( 33%) 10.02 ( 41%)
0 kB ( 0%)
so there are two offenders. The dominance one is from CFG cleanup as
-ftime-report-details shows:
tree CFG cleanup : 3.52 ( 14%) 0.01 ( 25%) 3.43 ( 14%)
773 kB ( 3%)
`- dominance computation : 9.66 ( 39%) 0.01 ( 25%) 9.77 ( 39%)
0 kB ( 0%)
`- tree operand scan : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 kB ( 0%)
`- CFG verifier : 0.04 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
0 kB ( 0%)
>From gcc-bugs-return-605924-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 10:51:39 2018
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Subject: [Bug c++/85958] Make const qualifier error clear
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=53281
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonny Grant from comment #1)
> My idea of what would be clearest is :-
>
> Cannot pass ‘const int‘ as ‘int&‘ (non const)
I don't think that's an improvement at all.
But "... discards const qualifier" or "... discards volatile qualifier" or
"...discards const and volatile qualifiers" might be OK. Or saying "as
reference of non-const type 'int&'" similar to my proposed fix for PR 53281.
>From gcc-bugs-return-605925-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 10:56:29 2018
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Subject: [Bug tree-optimization/85964] [8/9 Regression] Compile time hog w/ -O3 -ftracer -fno-guess-branch-probability
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85964
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Status|NEW |ASSIGNED
CC| |rguenth at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
And the regression is likely for when I added
static bool
cleanup_tree_cfg_noloop (void)
{
...
/* Ensure that we have single entries into loop headers. Otherwise
if one of the entries is becoming a latch due to CFG cleanup
(from formerly being part of an irreducible region) then we mess
up loop fixup and associate the old loop with a different region
which makes niter upper bounds invalid. See for example PR80549.
This needs to be done before we remove trivially dead edges as
we need to capture the dominance state before the pending transform. */
if (current_loops)
{
...
/* If we have more than one entry to the loop header
create a forwarder. */
if (found_latch && ! any_abnormal && n > 1)
{
edge fallthru = make_forwarder_block (bb, mfb_keep_latches,
NULL);
because make_forwarder_block adds a new block which in turn uses
iterate_fix_dominators to fix dominators. We use dominators to find
latches but we could split the analysis from the transform part and
decide to throw away and re-compute dominators based on some threshold.
Not sure if it is possible to estimate the work of iterate_fix_dominators
up-front.
>From gcc-bugs-return-605926-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 11:02:14 2018
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Subject: [Bug target/85961] scratch register rsi used after function call
Date: Tue, 29 May 2018 11:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85961
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ra
Target| |x86_64-*-*, i?86-*-*
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
To me it shoulds you are messing with the ABI behind GCCs back. We use IPA
register allocation to do this kind of transform that of course doesn't work
if you do this.
So - does -fno-ipa-ra fix this for you?
>From gcc-bugs-return-605927-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 11:06:53 2018
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Subject: [Bug target/83009] gcc.target/aarch64/store_v2vec_lanes.c fails with -mabi=ilp32
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avieira at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #9 from avieira at gcc dot gnu.org ---
I believe my patch fixes this.
>From gcc-bugs-return-605928-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 11:27:17 2018
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From: "bki at hacon dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85961] scratch register rsi used after function call
Date: Tue, 29 May 2018 11:27:00 -0000
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--- Comment #2 from bki at hacon dot de ---
(In reply to Richard Biener from comment #1)
> To me it shoulds you are messing with the ABI behind GCCs back.
True.
I'd still argue that the SysV-ABI suggests that a caller would need to save and
restore %rsi before/after a normal function call. But you are right in that the
function _ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv.isra.0
is not 'normal' in this case but completely in the hands of the compiler (who
does not clobber rsi).
I could rework my messing with the ABI to change fewer registers but since that
is very performance sensitive code, I'd like to understand better if it is
really necessary.
> We use IPA
> register allocation to do this kind of transform that of course doesn't work
> if you do this.
>
> So - does -fno-ipa-ra fix this for you?
No, I get the same instruction sequence with '-fno-ipa-ra'
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Subject: [Bug target/85968] New: gcc/config/arc/arc.c:9805: bad test ?
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gcc/trunk/gcc/config/arc/arc.c:9805:65: warning: bitwise comparison always
evaluates to true [-Wtautological-compare]
Source code is
250266 claziss if (((fn_type & ARC_FUNCTION_ILINK1) |
ARC_FUNCTION_FIRQ) != 0)
250266 claziss regno = ILINK1_REGNUM;
250266 claziss else if ((fn_type & ARC_FUNCTION_ILINK2) != 0)
250266 claziss regno = ILINK2_REGNUM;
250266 claziss else
250266 claziss gcc_unreachable ();
but
/* Fast interrupt is only available on ARCv2 processors. */
ARC_FUNCTION_FIRQ = 1 << 3,
so regno only ever gets set to ILINK1_REGNUM.
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Subject: [Bug c++/85965] G++ gives cryptic error instead of incomplete type
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
There's nothing that can be done here. The error comes from the library (not
the compiler) and there's no way the compiler can possibly say "the static
assertion would have passed if the __is_invocable trait had been true, which
might have happened if the type was complete so that a conversion sequence from
const Biz* to const Bar* might be possible".
The is_invocable trait asks if that function object can be called with those
arguments, and when Biz is incomplete the answer is no.
I think sadly I have to remove that static_assertion, or just make it happen
later when the comparison function is used (by which point either the call
works, or you get an error anyway and the static assertion doesn't add any
value).
>From gcc-bugs-return-605931-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 11:57:00 2018
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Subject: [Bug target/85969] New: avr/gen-avr-mmcu-specs.c:56: unused function ?
Date: Tue, 29 May 2018 11:56:00 -0000
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Bug ID: 85969
Summary: avr/gen-avr-mmcu-specs.c:56: unused function ?
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config/avr/gen-avr-mmcu-specs.c:56:1: warning: ‘bool str_prefix_p(const char*,
const char*)’ defined but not used [-Wunused-function]
Source code is
221141 gjl /* Return true iff STR starts with PREFIX. */
221141 gjl
221141 gjl static bool
221141 gjl str_prefix_p (const char *str, const char *prefix)
221141 gjl {
255831 jakub return strncmp (str, prefix, strlen (prefix)) == 0;
221141 gjl }
$ fgrep str_prefix_p /home/dcb/gcc/trunk/gcc/config/avr/gen-avr-mmcu-specs.c
str_prefix_p (const char *str, const char *prefix)
$
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Subject: [Bug target/85918] Conversions to/from [unsigned] long long are not vectorized for AVX512DQ target
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue May 29 11:58:24 2018
New Revision: 260893
URL: https://gcc.gnu.org/viewcvs?rev=260893&root=gcc&view=rev
Log:
PR target/85918
* tree.def (VEC_UNPACK_FIX_TRUNC_HI_EXPR, VEC_UNPACK_FIX_TRUNC_LO_EXPR,
VEC_PACK_FLOAT_EXPR): New tree codes.
* tree-pretty-print.c (op_code_prio): Handle
VEC_UNPACK_FIX_TRUNC_HI_EXPR and VEC_UNPACK_FIX_TRUNC_LO_EXPR.
(dump_generic_node): Handle VEC_UNPACK_FIX_TRUNC_HI_EXPR,
VEC_UNPACK_FIX_TRUNC_LO_EXPR and VEC_PACK_FLOAT_EXPR.
* tree-inline.c (estimate_operator_cost): Likewise.
* gimple-pretty-print.c (dump_binary_rhs): Handle VEC_PACK_FLOAT_EXPR.
* fold-const.c (const_binop): Likewise.
(const_unop): Handle VEC_UNPACK_FIX_TRUNC_HI_EXPR and
VEC_UNPACK_FIX_TRUNC_LO_EXPR.
* tree-cfg.c (verify_gimple_assign_unary): Likewise.
(verify_gimple_assign_binary): Handle VEC_PACK_FLOAT_EXPR.
* cfgexpand.c (expand_debug_expr): Handle VEC_UNPACK_FIX_TRUNC_HI_EXPR,
VEC_UNPACK_FIX_TRUNC_LO_EXPR and VEC_PACK_FLOAT_EXPR.
* expr.c (expand_expr_real_2): Likewise.
* optabs.def (vec_packs_float_optab, vec_packu_float_optab,
vec_unpack_sfix_trunc_hi_optab, vec_unpack_sfix_trunc_lo_optab,
vec_unpack_ufix_trunc_hi_optab, vec_unpack_ufix_trunc_lo_optab): New
optabs.
* optabs.c (expand_widen_pattern_expr): For
VEC_UNPACK_FIX_TRUNC_HI_EXPR and VEC_UNPACK_FIX_TRUNC_LO_EXPR use
sign from result type rather than operand's type.
(expand_binop_directly): For vec_packu_float_optab and
vec_packs_float_optab allow result type to be different from operand's
type.
* optabs-tree.c (optab_for_tree_code): Handle
VEC_UNPACK_FIX_TRUNC_HI_EXPR, VEC_UNPACK_FIX_TRUNC_LO_EXPR and
VEC_PACK_FLOAT_EXPR. Formatting fixes.
* tree-vect-generic.c (expand_vector_operations_1): Handle
VEC_UNPACK_FIX_TRUNC_HI_EXPR, VEC_UNPACK_FIX_TRUNC_LO_EXPR and
VEC_PACK_FLOAT_EXPR.
* tree-vect-stmts.c (supportable_widening_operation): Handle
FIX_TRUNC_EXPR.
(supportable_narrowing_operation): Handle FLOAT_EXPR.
* config/i386/i386.md (fixprefix, floatprefix): New code attributes.
* config/i386/sse.md (*float<floatunssuffix>v2div2sf2): Rename to ...
(float<floatunssuffix>v2div2sf2): ... this. Formatting fix.
(vpckfloat_concat_mode, vpckfloat_temp_mode, vpckfloat_op_mode): New
mode attributes.
(vec_pack<floatprefix>_float_<mode>): New expander.
(vunpckfixt_mode, vunpckfixt_model, vunpckfixt_extract_mode): New mode
attributes.
(vec_unpack_<fixprefix>fix_trunc_lo_<mode>,
vec_unpack_<fixprefix>fix_trunc_hi_<mode>): New expanders.
* doc/md.texi (vec_packs_float_@var{m}, vec_packu_float_@var{m},
vec_unpack_sfix_trunc_hi_@var{m}, vec_unpack_sfix_trunc_lo_@var{m},
vec_unpack_ufix_trunc_hi_@var{m}, vec_unpack_ufix_trunc_lo_@var{m}):
Document.
* doc/generic.texi (VEC_UNPACK_FLOAT_HI_EXPR,
VEC_UNPACK_FLOAT_LO_EXPR): Fix pasto in description.
(VEC_UNPACK_FIX_TRUNC_HI_EXPR, VEC_UNPACK_FIX_TRUNC_LO_EXPR,
VEC_PACK_FLOAT_EXPR): Document.
* gcc.target/i386/avx512dq-pr85918.c: Add -mprefer-vector-width=512
and -fno-vect-cost-model options. Add aligned(64) attribute to the
arrays. Add suffix 1 to all functions and use 4 iterations rather
than N. Add functions with conversions to and from float.
Add new set of functions with 8 iterations and another one
with 16 iterations, expect 24 vectorized loops instead of just 4.
* gcc.target/i386/avx512dq-pr85918-2.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/avx512dq-pr85918-2.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/cfgexpand.c
trunk/gcc/config/i386/i386.md
trunk/gcc/config/i386/sse.md
trunk/gcc/doc/generic.texi
trunk/gcc/doc/md.texi
trunk/gcc/expr.c
trunk/gcc/fold-const.c
trunk/gcc/gimple-pretty-print.c
trunk/gcc/optabs-tree.c
trunk/gcc/optabs.c
trunk/gcc/optabs.def
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/i386/avx512dq-pr85918.c
trunk/gcc/tree-cfg.c
trunk/gcc/tree-inline.c
trunk/gcc/tree-pretty-print.c
trunk/gcc/tree-vect-generic.c
trunk/gcc/tree-vect-stmts.c
trunk/gcc/tree.def
>From gcc-bugs-return-605933-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 12:01:53 2018
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From: "jose.dapena at lge dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85970] New: Cannot move a std::unique_ptr to insert into a map
Date: Tue, 29 May 2018 12:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85970
Bug ID: 85970
Summary: Cannot move a std::unique_ptr to insert into a map
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jose.dapena at lge dot com
Target Milestone: ---
Created attachment 44206
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44206&action=edit
Test case
Trying to insert to an std::map with value type std::unique_ptr using a move to
the initializer list fails:
std::map<std::string, std::unique_ptr<A>> map;
std::string str = "a";
std::unique_ptr<A> a = std::make_unique<A>();
// This fails
map.insert({str, std::move(a)});
But, if instead of this we do:
map.insert(std::pair<std::string, std::unique_ptr<A>>(str, std::move(a)));
It works.
This is working in LLVM libc++.
The error we get is related to trying to use the copy contructor of std::pair
and std::unique_ptr:
/usr/include/c++/7/ext/new_allocator.h:136:4: error: use of deleted function
‘std::pair<_T1, _T2>::pair(const std::pair<_T1, _T2>&) [with _T1 = const
std::__cxx11::basic_string<char>; _T2 = std::unique_ptr<A>]’
{ ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/7/bits/stl_algobase.h:64:0,
from /usr/include/c++/7/bits/stl_tree.h:63,
from /usr/include/c++/7/map:60,
from main.cc:1:
/usr/include/c++/7/bits/stl_pair.h:292:17: note: ‘std::pair<_T1,
_T2>::pair(const std::pair<_T1, _T2>&) [with _T1 = const
std::__cxx11::basic_string<char>; _T2 = std::unique_ptr<A>]’ is implicitly
deleted because the default definition would be ill-formed:
constexpr pair(const pair&) = default;
^~~~
/usr/include/c++/7/bits/stl_pair.h:292:17: error: use of deleted function
‘std::unique_ptr<_Tp, _Dp>::unique_ptr(const std::unique_ptr<_Tp, _Dp>&) [with
_Tp = A; _Dp = std::default_delete<A>]’
In file included from /usr/include/c++/7/memory:80:0,
from main.cc:2:
/usr/include/c++/7/bits/unique_ptr.h:388:7: note: declared here
unique_ptr(const unique_ptr&) = delete;
^~~~~~~~~~
>From gcc-bugs-return-605934-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 12:03:48 2018
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From: "jose.dapena at lge dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/85970] Cannot move a std::unique_ptr to insert into a map
Date: Tue, 29 May 2018 12:03:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85970
Jose Dapena Paz <jose.dapena at lge dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|c++ |libstdc++
--- Comment #1 from Jose Dapena Paz <jose.dapena at lge dot com> ---
Though I reported to gcc, it seems it is actually related to the libstdc++
library. GCC properly compiles this code using LLVM libc++.
>From gcc-bugs-return-605935-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 12:06:23 2018
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From: "mcccs at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85971] New: Really Simple "If" with one function call inside is not optimized efficiently
Date: Tue, 29 May 2018 12:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85971
Bug ID: 85971
Summary: Really Simple "If" with one function call inside is
not optimized efficiently
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: mcccs at gmx dot com
Target Milestone: ---
GCC: 8 or 9/trunk
Optimization: O3 or Ofast
Code:
```
int PolyMod(int s);
void CreateChecksum(int isTestNet, int *mod) {
if (isTestNet == 0) {
*mod = PolyMod(5);
} else {
*mod = PolyMod(9);
}
}
```
It is optimized very inefficiently. The
assembly has one branch.
However, if the compiler was as smart as the
people who develop it, he'd transform the code into
this:
```
int PolyMod(int s);
void CreateChecksum(int isTestNet, int *mod) {
int a;
if (isTestNet == 0) {
a = 5;
} else {
a = 9;
}
*mod = PolyMod(a);
}
```
which compiles to assembly with zero branches.
Another way to reach the same efficient assembly would be
```
int PolyMod(int s);
void CreateChecksum(int isTestNet, int *mod) {
*mod = PolyMod(isTestNet == 0 ? 5 : 9);
}
```
So, the compiler has problems seeing little powerful
argument optimizations.
>From gcc-bugs-return-605936-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 12:11:26 2018
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Subject: [Bug target/85972] New: cr16/predicates.md:163: bad if test ?
Date: Tue, 29 May 2018 12:11:00 -0000
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Bug ID: 85972
Summary: cr16/predicates.md:163: bad if test ?
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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runk/gcc/config/cr16/predicates.md:163:17:
warning: logical ‘or’ of collectively exhaustive tests is always true
[-Wlogical
-op]
Source code is
return (IN_RAN(INTVAL (op), 0, 15) && ((INTVAL (op) != 9)
|| (INTVAL (op) != 11))) ? 1 : 0 ;
Maybe better code
return (IN_RAN(INTVAL (op), 0, 15) && ((INTVAL (op) != 9)
&& (INTVAL (op) != 11))) ? 1 : 0 ;
>From gcc-bugs-return-605937-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 12:12:13 2018
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Subject: [Bug lto/85759] ICE output_profile_summary, at lto-cgraph.c:706 using -profile-use
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--- Comment #21 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue May 29 12:11:21 2018
New Revision: 260895
URL: https://gcc.gnu.org/viewcvs?rev=260895&root=gcc&view=rev
Log:
libgcov: report about a different timestamp (PR gcov-profile/85759).
2018-05-29 Martin Liska <mliska@suse.cz>
PR gcov-profile/85759
* doc/gcov.texi: Document GCOV_ERROR_FILE and GCOV_EXIT_AT_ERROR
env variables.
2018-05-29 Martin Liska <mliska@suse.cz>
PR gcov-profile/85759
* libgcov-driver-system.c (gcov_error): Introduce usage of
GCOV_EXIT_AT_ERROR env. variable.
* libgcov-driver.c (merge_one_data): Print error that we
overwrite a gcov file with a different timestamp.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/doc/gcov.texi
trunk/libgcc/ChangeLog
trunk/libgcc/libgcov-driver-system.c
trunk/libgcc/libgcov-driver.c
>From gcc-bugs-return-605938-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 12:13:37 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 tree-optimization/85971] Really Simple "If" with one function call inside is not optimized efficiently
Date: Tue, 29 May 2018 12:13:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-29
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-605939-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 12:16:27 2018
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Subject: [Bug libstdc++/82522] std::map::insert(value_type &&) not selected
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jose.dapena at lge dot com
--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 85970 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-605940-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 12:17:23 2018
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Subject: [Bug libstdc++/85970] Cannot move a std::unique_ptr to insert into a map
Date: Tue, 29 May 2018 12:16:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This was a defect in the standard, not GCC, and is already fixed in GCC 7.3.0
*** This bug has been marked as a duplicate of bug 82522 ***
>From gcc-bugs-return-605941-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 12:29:14 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/85964] [8/9 Regression] Compile time hog w/ -O3 -ftracer -fno-guess-branch-probability
Date: Tue, 29 May 2018 12:29:00 -0000
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Ok, it's not this part of CFG cleanup but the remove_edge_and_domiated_blocks
call in cleanup_control_expr_graph. With the reduced testcase we call it
around
2000 times.
The FSM thing of course is separate, looks like some quadraticness.
I will see if I can somehow improve CFG cleanup (given it is called
remove_edge_and_dominated_blocks avoiding dominators sounds hard...).
>From gcc-bugs-return-605942-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 12:37:29 2018
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Subject: [Bug tree-optimization/85964] [8/9 Regression] Compile time hog w/ -O3 -ftracer -fno-guess-branch-probability
Date: Tue, 29 May 2018 12:37:00 -0000
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--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
For the FSM part since we walk the whole function for _each_ control stmt name
this analysis part, find_jump_threads_backwards (basic_block bb, bool speed_p),
is quadratic in the number of BBs.
There's limiting via PARAM_FSM_MAXIMUM_PHI_ARGUMENTS but I guess it should
instead limit itself on the maximum length of a jump threading path and
do that already during analysis rather than only later throwing away
non-profitable ones.
>From gcc-bugs-return-605943-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 13:11:48 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++/85973] New: [[nodiscard]] shall emit a warning for unused anonymous variable
Date: Tue, 29 May 2018 13:11:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85973
Bug ID: 85973
Summary: [[nodiscard]] shall emit a warning for unused
anonymous variable
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: romain.geissler at amadeus dot com
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Hi,
I would to know if the following (currently not implemented) behaviour of
[[nodiscard]] would be useful or not. I am raising this since we have just hit
this case in a real codebase.
Currently a class can be annotated [[nodiscard]] in which case you can't ignore
returned values of this class. However no warning is emitted when an anonymous
and apparently unused instance of this class is created.
It will be clearer with the following snippet:
class [[nodiscard]] A
{
public:
A(void* someArgument) { /* Get some RAII resources */}
~A() { /* Release some RAII resources */}
A(A&&) = default;
A& operator=(A&&) = default;
private:
A(const A&) = delete;
A& operator=(const A&) = delete;
};
A f();
void someStatement();
void g()
{
f(); // Here ignored A result is correctly warned
{
A(nullptr); // Here the anonymous A created does not yield any warning
// while one might expect to (ie we should write: A a(nullptr); using a
// non anonymous variable, which changes the semantic of the program.)
someStatement(); // statement using the fact that we use RAII resource
locking.
}
}
Typically A could be std::lock_guard.
As you can see in godbolt https://godbolt.org/g/AdxJMY only the call to f()
raises the warning, but not the anonymous A(nullptr). One (actually I) would
expect also a warning on the line A(nullptr). Is this improvement welcome or
not ?
Cheers,
Romain
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Subject: [Bug ipa/85960] -fipa-pta and ifunc are incompatible
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--- Comment #2 from Gianni Tedesco <gianni at scaramanga dot co.uk> ---
Both gcc-7.3 and gcc-8 from ubuntu on x86-64:
gcc version 8.0.1 20180414 (experimental) [trunk revision 259383] (Ubuntu
8-20180414-1ubuntu2)
gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)
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Subject: [Bug ipa/85960] -fipa-pta and ifunc are incompatible
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--- Comment #3 from Gianni Tedesco <gianni at scaramanga dot co.uk> ---
Both gcc-7.3 and gcc-8 from ubuntu on x86-64:
gcc version 8.0.1 20180414 (experimental) [trunk revision 259383] (Ubuntu
8-20180414-1ubuntu2)
gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)
>From gcc-bugs-return-605946-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 13:21:16 2018
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Subject: [Bug libstdc++/85970] Cannot move a std::unique_ptr to insert into a map
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Jose Dapena Paz <jose.dapena at lge dot com> changed:
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----------------------------------------------------------------------------
Status|RESOLVED |VERIFIED
--- Comment #3 from Jose Dapena Paz <jose.dapena at lge dot com> ---
Confirmed it is already fixed in 7.3.0. Also, the original bug report addresses
the same problem. Thanks!
>From gcc-bugs-return-605947-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 13:22:01 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/85960] -fipa-pta and ifunc are incompatible
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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> ---
Confirmed with:
$ gcc pr85960.c -O2 -Wall -fipa-pta && ./a.out 2
Let me take a look.
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Subject: [Bug c/85974] New: Failure to optimize difference of two pointers into a compile time constant
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85974
Bug ID: 85974
Summary: Failure to optimize difference of two pointers into a
compile time constant
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: c
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This issue is exposed by test case testsuite/gcc.c-torture/compile/930326-1.c,
on platforms where ptrdiff_t is not "long" (such as pdp11). In that case, the
last line:
long i = s.f-&s.b;
fails with "error: initializer element is not computable at load time".
It's not a target bug; the problem can be reproduced for other targets by
changing the "long" to "char" in that statement.
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Subject: [Bug target/85950] Unsafe-math-optimizations regresses optimization using SSE4.1 roundss
Date: Tue, 29 May 2018 14:02:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85950
--- Comment #6 from Allan Jensen <linux at carewolf dot com> ---
Btw, I have tested and the patch works for my cases.
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Subject: [Bug c/85974] Failure to optimize difference of two pointers into a compile time constant
Date: Tue, 29 May 2018 14:19:00 -0000
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--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
In match.pd
(simplify
- (pointer_diff (convert?@2 @0) (convert?@3 ADDR_EXPR@1))
+ (pointer_diff (convert?@2 @0) (convert1?@3 ADDR_EXPR@1))
(that is, we can have only one cast, not just 0 or 2)
and similarly for the adjacent transformation. I didn't check if that requires
any other adjustment, just pointing out a likely place for a patch.
>From gcc-bugs-return-605951-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 14:52:09 2018
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From: "stephan.kramer at imperial dot ac.uk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libfortran/85975] New: Incorrect size for spread array
Date: Tue, 29 May 2018 14:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85975
Bug ID: 85975
Summary: Incorrect size for spread array
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
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Priority: P3
Component: libfortran
Assignee: unassigned at gcc dot gnu.org
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With the following program
program foo
implicit none
call bar(2, 3, 5, 7)
contains
subroutine bar(k, l, m, n)
integer, intent(in) :: k, l, m, n
real, dimension(k) :: a
real, dimension(k,l):: b
real, dimension(k,l,m):: c
real, dimension(k,l,m,n):: d
print *, size(spread(A, 1, 1))
print *, size(spread(b, 1, 1))
print *, size(spread(c, 1, 1))
print *, size(spread(d, 1, 1))
end subroutine
end program
I get the following result:
$ gfortran test2.f90
skramer@gyre:~/tst/gfortran8$ ./a.out
2
6
0
210
skramer@gyre:~/tst/gfortran8$ ./a.out
0
6
754395868
210
i.e. the results for the A and c arrrays are incorrect (and vary between
subsequent reruns).
After some digging in the libfortran source I think this is due to a bug in the
GFC_DTYPE_COPY_SETRANK macro introduced in
https://gcc.gnu.org/ml/gcc-patches/2018-01/msg00369.html, where line 421 of
libgfortran/libgfortran.h changed from
(a)->dtype = (((b)->dtype & ~GFC_DTYPE_RANK_MASK) | n ); \
to
(a)->dtype.rank = ((b)->dtype.rank | n ); \
The thing is that the "| n" makes sense in the previous case where the relevant
bits that store the previous rank have been zeroed out first. Now that rank is
a separate field, I think it should just be:
(a)->dtype.rank = n
Note that in the example above the even ranked arrays (B and D) do get the
correct result. This is because in those cases it happens to be that
new_rank==(old_rank | new_rank) (3 == 2 | 3 and 5 == 4 | 5). In the case of
arrays A and C however, we get 1 | 2 == 3 and 3 | 4 == 7, so that the rank of
the resulting spread array is too big, and the size calculations uses spurious
uninitialised array extents.
I have found, what I think are, related issues, when passing the result of
spread of a rank-3 array into a subroutine, where in the "internal pack"
routine would sometimes try to allocate a temporary that is way too big and
cause an out of memory error (similar to
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85816). Unfortunately this one
seems a little harder to reproduce in a small program.
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Subject: [Bug c++/85976] New: ICE in cp_tree_equal when building Blitz. May be nested templates.
Date: Tue, 29 May 2018 15:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85976
Bug ID: 85976
Summary: ICE in cp_tree_equal when building Blitz. May be
nested templates.
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: matthew.hambley at metoffice dot gov.uk
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When compiling https://github.com/blitzpp/blitz v1.0.1 an ICE is generated.
This does not happen with GCC 6.4.0 or 7.1.0. Processed source file attached.
g++ -v -save-temps -DHAVE_CONFIG_H -I../../blitz-1.0.1/testsuite
-I../../blitz-1.0.1 -I.. -I.../gcc/8.1.0/include -g -DBZ_DEBUG -DBZ_DEBUG -MT
expression-slicing.o -MD -MP -MF .deps/expression-slicing.Tpo -c -o
expression-slicing.o ../../blitz-1.0.1/testsuite/expression-slicing.cpp
Using built-in specs.
COLLECT_GCC=g++
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-8.1.0/configure --prefix=.../gcc/8.1.0
--disable-multilib
Thread model: posix
gcc version 8.1.0 (GCC)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-D' 'HAVE_CONFIG_H' '-I'
'../../blitz-1.0.1/testsuite' '-I' '../../blitz-1.0.1' '-I' '..' '-I'
'.../gcc/8.1.0/include' '-g' '-D' 'BZ_DEBUG' '-D' 'BZ_DEBUG' '-MT'
'expression-slicing.o' '-MD' '-MP' '-MF' '.deps/expression-slicing.Tpo' '-c'
'-o' 'expression-slicing.o' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
.../gcc/8.1.0/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.1.0/cc1plus -E -quiet
-v -I ../../blitz-1.0.1/testsuite -I ../../blitz-1.0.1 -I .. -I
.../gcc/8.1.0/include -iprefix
.../gcc/8.1.0/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/ -MD
expression-slicing.d -MF .deps/expression-slicing.Tpo -MP -MT
expression-slicing.o -D_GNU_SOURCE -D HAVE_CONFIG_H -D BZ_DEBUG -D BZ_DEBUG
../../blitz-1.0.1/testsuite/expression-slicing.cpp -mtune=generic -march=x86-64
-g -fworking-directory -fpch-preprocess -o expression-slicing.ii
ignoring nonexistent directory
".../gcc/8.1.0/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../x86_64-pc-linux-gnu/include"
ignoring duplicate directory
".../gcc/8.1.0/bin/../lib/gcc/../../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0"
ignoring duplicate directory
".../gcc/8.1.0/bin/../lib/gcc/../../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/x86_64-pc-linux-gnu"
ignoring duplicate directory
".../gcc/8.1.0/bin/../lib/gcc/../../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/backward"
ignoring duplicate directory
".../gcc/8.1.0/bin/../lib/gcc/../../lib/gcc/x86_64-pc-linux-gnu/8.1.0/include"
ignoring duplicate directory
".../gcc/8.1.0/bin/../lib/gcc/../../lib/gcc/x86_64-pc-linux-gnu/8.1.0/include-fixed"
ignoring nonexistent directory
".../gcc/8.1.0/bin/../lib/gcc/../../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../x86_64-pc-linux-gnu/include"
ignoring duplicate directory ".../gcc/8.1.0/include"
as it is a non-system directory that duplicates a system directory
#include "..." search starts here:
#include <...> search starts here:
../../blitz-1.0.1/testsuite
../../blitz-1.0.1
..
.../gcc/8.1.0/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0
.../gcc/8.1.0/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/x86_64-pc-linux-gnu
.../gcc/8.1.0/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/backward
.../gcc/8.1.0/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/include
.../gcc/8.1.0/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/include-fixed
/usr/local/include
.../gcc/8.1.0/bin/../lib/gcc/../../include
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-D' 'HAVE_CONFIG_H' '-I'
'../../blitz-1.0.1/testsuite' '-I' '../../blitz-1.0.1' '-I' '..' '-I'
'.../gcc/8.1.0/include' '-g' '-D' 'BZ_DEBUG' '-D' 'BZ_DEBUG' '-MT'
'expression-slicing.o' '-MD' '-MP' '-MF' '.deps/expression-slicing.Tpo' '-c'
'-o' 'expression-slicing.o' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
.../gcc/8.1.0/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.1.0/cc1plus
-fpreprocessed expression-slicing.ii -quiet -dumpbase expression-slicing.cpp
-mtune=generic -march=x86-64 -auxbase-strip expression-slicing.o -g -version -o
expression-slicing.s
GNU C++14 (GCC) version 8.1.0 (x86_64-pc-linux-gnu)
compiled by GNU C version 8.1.0, GMP version 6.1.0, MPFR version 3.1.4,
MPC version 1.0.3, isl version isl-0.18-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++14 (GCC) version 8.1.0 (x86_64-pc-linux-gnu)
compiled by GNU C version 8.1.0, GMP version 6.1.0, MPFR version 3.1.4,
MPC version 1.0.3, isl version isl-0.18-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 70ca2263e1163415e5052b440bbed5d9
In file included from ../../blitz-1.0.1/blitz/array/stencil-et.h:398,
from ../../blitz-1.0.1/testsuite/expression-slicing.cpp:3:
../../blitz-1.0.1/blitz/array/stencil-classes.cc:227:73: internal compiler
error: in cp_tree_equal, at cp/tree.c:3896
rank_> >::type i)
const
^
0x5ce766 cp_tree_equal(tree_node*, tree_node*)
../../gcc-8.1.0/gcc/cp/tree.c:3896
0x6e6179 template_args_equal(tree_node*, tree_node*, bool)
../../gcc-8.1.0/gcc/cp/pt.c:8688
0x6e5ff9 comp_template_args(tree_node*, tree_node*, tree_node**, tree_node**,
bool)
../../gcc-8.1.0/gcc/cp/pt.c:8717
0x73e8af structural_comptypes
../../gcc-8.1.0/gcc/cp/typeck.c:1337
0x6e62ec template_args_equal(tree_node*, tree_node*, bool)
../../gcc-8.1.0/gcc/cp/pt.c:8669
0x6e5ff9 comp_template_args(tree_node*, tree_node*, tree_node**, tree_node**,
bool)
../../gcc-8.1.0/gcc/cp/pt.c:8717
0x6ebcf9 spec_hasher::equal(spec_entry*, spec_entry*)
../../gcc-8.1.0/gcc/cp/pt.c:1668
0x71301d hash_table<spec_hasher, xcallocator>::find_with_hash(spec_entry*
const&, unsigned int)
../../gcc-8.1.0/gcc/hash-table.h:850
0x6fb2c4 lookup_template_class_1
../../gcc-8.1.0/gcc/cp/pt.c:9331
0x6fb2c4 lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*,
int, int)
../../gcc-8.1.0/gcc/cp/pt.c:9650
0x71eced finish_template_type(tree_node*, tree_node*, int)
../../gcc-8.1.0/gcc/cp/semantics.c:3228
0x6c3b14 cp_parser_template_id
../../gcc-8.1.0/gcc/cp/parser.c:15861
0x6c3c2e cp_parser_class_name
../../gcc-8.1.0/gcc/cp/parser.c:22396
0x6cf507 cp_parser_qualifying_entity
../../gcc-8.1.0/gcc/cp/parser.c:6570
0x6cf507 cp_parser_nested_name_specifier_opt
../../gcc-8.1.0/gcc/cp/parser.c:6256
0x6cfb41 cp_parser_nested_name_specifier
../../gcc-8.1.0/gcc/cp/parser.c:6496
0x6cfc4e cp_parser_elaborated_type_specifier
../../gcc-8.1.0/gcc/cp/parser.c:17667
0x6cb579 cp_parser_type_specifier
../../gcc-8.1.0/gcc/cp/parser.c:16811
0x6d7755 cp_parser_decl_specifier_seq
../../gcc-8.1.0/gcc/cp/parser.c:13623
0x6d7dbb cp_parser_parameter_declaration
../../gcc-8.1.0/gcc/cp/parser.c:21512
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.
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Subject: [Bug c++/85976] ICE in cp_tree_equal when building Blitz. May be nested templates.
Date: Tue, 29 May 2018 16:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85976
--- Comment #1 from matthew.hambley at metoffice dot gov.uk ---
Created attachment 44207
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44207&action=edit
Processed source file
>From gcc-bugs-return-605954-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 16:24:39 2018
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From: "jeremy at jeremyms dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85977] New: Incorrect handling of array reference size deduction
Date: Tue, 29 May 2018 16:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85977
Bug ID: 85977
Summary: Incorrect handling of array reference size deduction
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jeremy at jeremyms dot com
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This code should compile, but does not.
template <int N>
void foo(const long (&arr)[N]) {}
void bar() {
foo({1,2,3});
}
See discussion here:
https://groups.google.com/a/isocpp.org/forum/#!topic/std-discussion/FS5lNgf9_pQ
>From gcc-bugs-return-605955-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 16:27:18 2018
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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85978] New: config/frv/frv.c: 3 * iffy code in switch
Date: Tue, 29 May 2018 16:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85978
Bug ID: 85978
Summary: config/frv/frv.c: 3 * iffy code in switch
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
Target Milestone: ---
Target: frv
gcc/config/frv/frv.c:6715:7: warning: this statement may fall through
[-Wimplicit-fallthrough=]
gcc/config/frv/frv.c:6741:7: warning: this statement may fall through
[-Wimplicit-fallthrough=]
gcc/config/frv/frv.c:6766:7: warning: this statement may fall through
[-Wimplicit-fallthrough=]
Source code for the first one is
switch (to)
{
default:
break;
Instead merely carrying on with the code after the switch,
and going into the next case for the outer switch,
perhaps better code would flag up in some way the unexpected
value of "to" ?
>From gcc-bugs-return-605956-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 16:36:59 2018
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Subject: [Bug tree-optimization/85793] [8/9 Regression][AARCH64] ICE in verify_gimple during GIMPLE pass vect.
Date: Tue, 29 May 2018 16:36:00 -0000
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bin cheng <amker at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from bin cheng <amker at gcc dot gnu.org> ---
Should be fixed.
>From gcc-bugs-return-605957-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 16:40:10 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85979] New: Diagnostic says "__alignof" when the source says "alignof"
Date: Tue, 29 May 2018 16:40:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85979
Bug ID: 85979
Summary: Diagnostic says "__alignof" when the source says
"alignof"
Product: gcc
Version: 8.1.1
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
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Target Milestone: ---
int f() { return alignof(f); }
m.cc: In function 'int f()':
m.cc:1:27: error: ISO C++ forbids applying '__alignof' to an expression of
function type [-fpermissive]
int f() { return alignof(f); }
^
>From gcc-bugs-return-605958-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 16:55:45 2018
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Subject: [Bug c/85931] -Wsizeof-pointer-memaccess for strncpy with size of source
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-05-29
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Testing a patch.
>From gcc-bugs-return-605959-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 17:08:36 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++/85952] Bogus -Wunused-but-set-variable warning with array structured binding
Date: Tue, 29 May 2018 17:08:00 -0000
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue May 29 17:07:57 2018
New Revision: 260899
URL: https://gcc.gnu.org/viewcvs?rev=260899&root=gcc&view=rev
Log:
PR c++/85952
* init.c (build_aggr_init): For structured binding initialized from
array call mark_rvalue_use on the initializer.
* g++.dg/warn/Wunused-var-33.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/warn/Wunused-var-33.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/init.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-605960-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 17:25:49 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++/85963] [8/9 Regression] false positive "set but not used" warning [-Wunused-but-set-variable]
Date: Tue, 29 May 2018 17:25:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-29
Target Milestone|--- |8.2
Summary|false positive "set but not |[8/9 Regression] false
|used" warning |positive "set but not used"
|[-Wunused-but-set-variable] |warning
| |[-Wunused-but-set-variable]
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r253266, Jason, can you please have a look?
>From gcc-bugs-return-605961-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 17:28:57 2018
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From: "amonakov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85957] i686: Integers appear to be different, but compare as equal
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Last reconfirmed| |2018-05-29
CC| |amonakov at gcc dot gnu.org
Resolution|DUPLICATE |---
Ever confirmed|0 |1
--- Comment #7 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Reopening, the issue here is way more subtle than bug 323 and points to a
possible issue in DOM. Hopefully Richi can have a look and comment.
It appears dom2 pass performs something like jump threading based on
compile-time-evaluated floating-point expression values without also
substituting those expressions in IR. At run time, they are evaluated to
different values, leading to an inconsistency. Namely, dom2 creates bb 10:
<bb 9>:
# iftmp.1_1 = PHI <"true"(7), "false"(8), "true"(10)>
printf ("(a6 == b6) = %s\n", iftmp.1_1);
return 0;
<bb 10>:
_24 = __n2_13 * 1.0e+6;
b6_25 = (guint64) _24;
printf ("a6 = %llu\n", 1);
printf ("b6 = %llu\n", b6_25);
goto <bb 9>;
where jump to bb 9 implies that _24 evaluates to 1.0 and b6_25 to 1, but they
are not substituted as such, and at run time evaluate to 0.99... and 0 due to
excess precision.
The following reduced testcase demonstrates the same issue, but requires
-fdisable-tree-dom3 (on gcc-6 at least, as otherwise dom3 substitutes results
of compile-time evaluation).
__attribute__((noinline,noclone))
static double f(void)
{
return 1e-6;
}
int main(void)
{
double a = 1e-6, b = f();
if (a != b) __builtin_printf("uneq");
unsigned long long ia = a * 1e6, ib = b * 1e6;
__builtin_printf("%lld %s %lld\n", ia, ia == ib ? "==" : "!=", ib);
}
>From gcc-bugs-return-605962-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 17:33:02 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/53281] poor error message for calling a non-const method from a const object
Date: Tue, 29 May 2018 17:33:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53281
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
N.B. comment 6 is the subject of PR 85958 which is really a different bug to
this one. This is about invalid member function calls on cv-qualified objects,
and 85958 is about invalid attempts to bind references to cv-qualified objects.
>From gcc-bugs-return-605963-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 17:44:45 2018
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Subject: [Bug c++/85883] class template argument deduction fails in new-expression
Date: Tue, 29 May 2018 17:44:00 -0000
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Tue May 29 17:44:07 2018
New Revision: 260901
URL: https://gcc.gnu.org/viewcvs?rev=260901&root=gcc&view=rev
Log:
PR c++/85883
* init.c (build_new): Handle deducing a class with new
with more than one argument.
* g++.dg/cpp1z/class-deduction55.C: New test.
* g++.dg/cpp1z/class-deduction56.C: New test.
* g++.dg/cpp1z/class-deduction57.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp1z/class-deduction55.C
trunk/gcc/testsuite/g++.dg/cpp1z/class-deduction56.C
trunk/gcc/testsuite/g++.dg/cpp1z/class-deduction57.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/init.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-605964-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 17:47:04 2018
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Subject: [Bug c++/85883] class template argument deduction fails in new-expression
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed for GCC 9.
>From gcc-bugs-return-605965-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 17:51:01 2018
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Subject: [Bug target/85961] scratch register rsi used after function call
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |amonakov at gcc dot gnu.org
--- Comment #3 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
You'd need to disable IPA-RA after forcing -O2 with the pragma, i.e.:
#pragma GCC optimize "O2"
#pragma GCC optimize "no-ipa-ra"
We already have logic to disable IPA-RA when instrumentation/profiling is
active, but it's done once in toplev.c. Here the pragma re-enables IPA-RA after
toplev.c:process_options() has disabled it.
Do we want to adjust it given that "pragma optimized" is documented as "not
suitable for production use"?
>From gcc-bugs-return-605966-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 17:52:20 2018
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Subject: [Bug c++/85976] ICE in cp_tree_equal when building Blitz. May be nested templates.
Date: Tue, 29 May 2018 17:52:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-29
CC| |mpolacek at gcc dot gnu.org
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
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Subject: [Bug c++/85976] ICE in cp_tree_equal when building Blitz. May be nested templates.
Date: Tue, 29 May 2018 18:00:00 -0000
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r251438.
>From gcc-bugs-return-605968-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 18:17:09 2018
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Subject: [Bug c++/85977] Incorrect handling of array reference size deduction
Date: Tue, 29 May 2018 18:17:00 -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> ---
Confirmed. We get:
85977.C: In function ‘void bar()’:
85977.C:4:13: error: no matching function for call to ‘foo(<brace-enclosed
initializer list>)’
foo({1,2,3});
^
85977.C:2:6: note: candidate: ‘template<int N> void foo(const long int (&)[N])’
void foo(const long (&arr)[N]) {}
^~~
85977.C:2:6: note: template argument deduction/substitution failed:
85977.C:4:13: note: mismatched types ‘long int’ and ‘int’
foo({1,2,3});
^
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/85980] New: suboptimal code for strncmp for powerpc64
Date: Tue, 29 May 2018 18:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85980
Bug ID: 85980
Summary: suboptimal code for strncmp for powerpc64
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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As discussed in https://gcc.gnu.org/ml/gcc-patches/2018-05/msg01514.html, for
the following test case and the powerpc64le target, GCC emits the code below:
int f (__SIZE_TYPE__ i)
{
return __builtin_strncmp ("1234", "123", i < 3 ? i : 3);
}
f:
.LFB0:
.cfi_startproc
.LCF0:
0: addis 2,12,.TOC.-.LCF0@ha
addi 2,2,.TOC.-.LCF0@l
.localentry f,.-f
mflr 0
cmpldi 7,3,3
li 5,3
std 0,16(1)
stdu 1,-32(1)
.cfi_def_cfa_offset 32
.cfi_offset 65, 16
bgt 7,.L5
cmpdi 7,3,4 << unnecessary
mr 5,3 <<
ble 7,.L5 <<
li 5,4 <<
.L5:
addis 4,2,.LC1@toc@ha
addis 3,2,.LC0@toc@ha
addi 4,4,.LC1@toc@l
addi 3,3,.LC0@toc@l
bl strncmp
nop
addi 1,1,32
.cfi_def_cfa_offset 0
ld 0,16(1)
mtlr 0
.cfi_restore 65
blr
The comparison and the subsequent branch are helpful when strncmp is expanded
inline but do not benefit the library version of strncmp and only bloat and
slow down the caller. (The origins of the code are tracked down in
https://gcc.gnu.org/ml/gcc-patches/2018-05/msg01406.html). The following
simple patch is enough to improve the generated code:
diff --git a/gcc/builtins.c b/gcc/builtins.c
index 841c1ef..5b9085b 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -4708,12 +4708,7 @@ expand_builtin_strncmp (tree exp, ATTRIBUTE_UNUSED rtx
target,
return target;
}
- /* Expand the library call ourselves using a stabilized argument
- list to avoid re-evaluating the function's arguments twice. */
- tree fn = build_call_nofold_loc (loc, fndecl, 3, arg1, arg2, len);
- gcc_assert (TREE_CODE (fn) == CALL_EXPR);
- CALL_EXPR_TAILCALL (fn) = CALL_EXPR_TAILCALL (exp);
- return expand_call (fn, target, target == const0_rtx);
+ return expand_call (exp, target, target == const0_rtx);
}
/* Expand a call to __builtin_saveregs, generating the result in TARGET,
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Subject: [Bug c++/85889] lambda expression can capture structured bindings
Date: Tue, 29 May 2018 18:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85889
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-29
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
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Subject: [Bug testsuite/85888] [9 Regression] New test case c-c++-common/attr-nonstring-6.c from r260541 fails with excess errors
Date: Tue, 29 May 2018 18:29:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Fixed via r260902.
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Subject: [Bug testsuite/85888] [9 Regression] New test case c-c++-common/attr-nonstring-6.c from r260541 fails with excess errors
Date: Tue, 29 May 2018 18:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85888
--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Tue May 29 18:29:04 2018
New Revision: 260902
URL: https://gcc.gnu.org/viewcvs?rev=260902&root=gcc&view=rev
Log:
PR middle-end/85888 - New test case c-c++-common/attr-nonstring-6.c from
r260541 fails with excess errors
2018-05-29 Martin Sebor <msebor@redhat.com>
Richard Biener <rguenther@suse.de>
PR testsuite/85888
* calls.c (get_size_range): Call determine_value_range instead
of get_value_range..
* tree-vrp.h (determine_value_range): Declared new function.
* tree-vrp.c (determine_value_range_1, determine_value_range): New.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/calls.c
trunk/gcc/tree-vrp.c
trunk/gcc/tree-vrp.h
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Subject: [Bug fortran/85981] New: ICE in gfc_trans_string_copy, at fortran/trans-expr.c:6539
Date: Tue, 29 May 2018 18:33:00 -0000
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Bug ID: 85981
Summary: ICE in gfc_trans_string_copy, at
fortran/trans-expr.c:6539
Product: gcc
Version: 9.0
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Down to at least 4.8 :
$ cat z1.f90
program p
integer, allocatable :: arr(:)
integer :: stat
character(len=128, kind=4) :: errmsg = ' '
allocate (arr(3), stat=stat, errmsg=errmsg)
print *, allocated(arr), stat, trim(errmsg)
end
$ gfortran-9-20180527 -c z1.f90
z1.f90:5:0:
allocate (arr(3), stat=stat, errmsg=errmsg)
internal compiler error: in gfc_trans_string_copy, at fortran/trans-expr.c:6539
0x7782cf gfc_trans_string_copy(stmtblock_t*, tree_node*, tree_node*, int,
tree_node*, tree_node*, int)
../../gcc/fortran/trans-expr.c:6539
0x7bb884 gfc_trans_allocate(gfc_code*)
../../gcc/fortran/trans-stmt.c:6708
0x74acf7 trans_code
../../gcc/fortran/trans.c:1996
0x772269 gfc_generate_function_code(gfc_namespace*)
../../gcc/fortran/trans-decl.c:6507
0x701040 translate_all_program_units
../../gcc/fortran/parse.c:6121
0x701040 gfc_parse_file()
../../gcc/fortran/parse.c:6324
0x7480ef gfc_be_parse_file
../../gcc/fortran/f95-lang.c:204
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Subject: [Bug fortran/85981] ICE in gfc_trans_string_copy, at fortran/trans-expr.c:6539
Date: Tue, 29 May 2018 18:34:00 -0000
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--- Comment #1 from G. Steinmetz <gscfq@t-online.de> ---
Works with character(kind=1) :
$ cat z2.f90
program p
integer, allocatable :: arr(:)
integer :: stat
character(len=128, kind=1) :: errmsg = ' '
allocate (arr(3), stat=stat, errmsg=errmsg)
print *, allocated(arr), stat, trim(errmsg)
end
$ gfortran-9-20180527 z2.f90 -static-libgfortran
$ a.out
T 0
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Subject: [Bug target/85950] Unsafe-math-optimizations regresses optimization using SSE4.1 roundss
Date: Tue, 29 May 2018 18:36:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85950
--- Comment #7 from uros at gcc dot gnu.org ---
Author: uros
Date: Tue May 29 18:35:34 2018
New Revision: 260903
URL: https://gcc.gnu.org/viewcvs?rev=260903&root=gcc&view=rev
Log:
PR target/85950
* config/i386/i386.md (l<rounding_insn><MODEF:mode><SWI48:mode>2):
Enable for TARGET_SSE4_1 and generate rounds{s,d} and cvtts{s,d}2si{,q}
sequence.
(sse4_1_round<mode>2): Use nonimmediate_operand
for operand 1 predicate.
testsuite/ChangeLog:
PR target/85950
* gcc.target/i386/pr85950.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/pr85950.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.md
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/85982] New: ICE in resolve_component, at fortran/resolve.c:13696
Date: Tue, 29 May 2018 18:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85982
Bug ID: 85982
Summary: ICE in resolve_component, at fortran/resolve.c:13696
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
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Needs option -fdec or -fdec-structure :
$ cat z1.f90
program p
structure /s/
integer :: a
integer, external, pointer :: b
end structure
end
$ gfortran-9-20180527 -c z1.f90 -fdec
f951: internal compiler error: Segmentation fault
0xba072f crash_signal
../../gcc/toplev.c:325
0x71d62c resolve_component
../../gcc/fortran/resolve.c:13696
0x71e812 resolve_fl_struct
../../gcc/fortran/resolve.c:14012
0x718d77 resolve_symbol
../../gcc/fortran/resolve.c:14568
0x73595b do_traverse_symtree
../../gcc/fortran/symbol.c:4153
0x71c0da resolve_types
../../gcc/fortran/resolve.c:16472
0x71794c gfc_resolve(gfc_namespace*)
../../gcc/fortran/resolve.c:16586
0x700e6a resolve_all_program_units
../../gcc/fortran/parse.c:6060
0x700e6a gfc_parse_file()
../../gcc/fortran/parse.c:6310
0x7480ef gfc_be_parse_file
../../gcc/fortran/f95-lang.c:204
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Subject: [Bug fortran/85982] ICE in resolve_component, at fortran/resolve.c:13696
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85982
--- Comment #1 from G. Steinmetz <gscfq@t-online.de> ---
Comparison sample :
$ cat z2.f90
program p
type t
integer :: a
integer, external, pointer :: b
end type
end
$ gfortran-9-20180527 -c z2.f90
z2.f90:4:23:
integer, external, pointer :: b
1
Error: Attribute at (1) is not allowed in a TYPE definition
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Subject: [Bug fortran/85983] New: ICE in check_dtio_interface1, at fortran/interface.c:4748
Date: Tue, 29 May 2018 18:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85983
Bug ID: 85983
Summary: ICE in check_dtio_interface1, at
fortran/interface.c:4748
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: gscfq@t-online.de
Target Milestone: ---
With incomplete or invalid dummy argument lists :
$ cat z1.f90
module m
type t
contains
procedure :: s1
procedure :: s2
generic :: write(formatted) => s1
generic :: write(formatted) => s2
end type
contains
subroutine s1 (dtv)
class(t), intent(in) :: dtv
end
subroutine s2 (dtv, unit)
class(t), intent(in) :: dtv
integer, intent(in) :: unit
end
end
$ cat z2.f90
module m
type t
contains
procedure :: s1
procedure :: s2
generic :: write(formatted) => s1
generic :: write(formatted) => s2
end type
contains
subroutine s1 (dtv, iomsg)
class(t), intent(in) :: dtv
character(*), intent(inout) :: iomsg
end
subroutine s2 (dtv, unit)
class(t), intent(in) :: dtv
integer, intent(in) :: unit
end
end
$ gfortran-9-20180527 -c z1.f90
f951: internal compiler error: in check_dtio_interface1, at
fortran/interface.c:4748
0x6b1478 check_dtio_interface1
../../gcc/fortran/interface.c:4748
0x6b8f05 gfc_check_dtio_interfaces(gfc_symbol*)
../../gcc/fortran/interface.c:4900
0x73595b do_traverse_symtree
../../gcc/fortran/symbol.c:4153
0x71c570 resolve_types
../../gcc/fortran/resolve.c:16513
0x71794c gfc_resolve(gfc_namespace*)
../../gcc/fortran/resolve.c:16586
0x701394 gfc_parse_file()
../../gcc/fortran/parse.c:6262
0x7480ef gfc_be_parse_file
../../gcc/fortran/f95-lang.c:204
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Subject: [Bug c/85984] New: ICE in create_pseudo_cfg, at dwarf2cfi.c:2874
Date: Tue, 29 May 2018 18:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85984
Bug ID: 85984
Summary: ICE in create_pseudo_cfg, at dwarf2cfi.c:2874
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Affects versions 8/9 at -O[23] (no better example found).
Changed between 20170723 and 20170820.
$ cat z1.c
int fn1 (void);
void __attribute__((naked))
fn2 (void)
{
if (!fn1())
abort ();
}
void fn3 (void)
{
fn2 ();
}
$ gcc-9-20180527 -c z1.c -O2
z1.c: In function 'fn2':
z1.c:6:5: warning: implicit declaration of function 'abort'
[-Wimplicit-function-declaration]
abort ();
^~~~~
z1.c:6:5: warning: incompatible implicit declaration of built-in function
'abort'
z1.c:6:5: note: include '<stdlib.h>' or provide a declaration of 'abort'
z1.c:1:1:
+#include <stdlib.h>
int fn1 (void);
z1.c:6:5:
abort ();
^~~~~
during RTL pass: dwarf2
z1.c:7:1: internal compiler error: in create_pseudo_cfg, at dwarf2cfi.c:2874
}
^
0x7cb7a7 create_pseudo_cfg
../../gcc/dwarf2cfi.c:2874
0x7cb7a7 execute_dwarf2_frame
../../gcc/dwarf2cfi.c:3049
0x7cb7a7 execute
../../gcc/dwarf2cfi.c:3540
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85981] ICE in gfc_trans_string_copy, at fortran/trans-expr.c:6539
Date: Tue, 29 May 2018 18:47:00 -0000
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-29
CC| |kargl at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from kargl at gcc dot gnu.org ---
(In reply to G. Steinmetz from comment #1)
> Works with character(kind=1) :
>
>
> $ cat z2.f90
> program p
> integer, allocatable :: arr(:)
> integer :: stat
> character(len=128, kind=1) :: errmsg = ' '
> allocate (arr(3), stat=stat, errmsg=errmsg)
> print *, allocated(arr), stat, trim(errmsg)
> end
>
>
> $ gfortran-9-20180527 z2.f90 -static-libgfortran
> $ a.out
> T 0
It ought to work with kind=1. For the original code,
and error message should be issued as kind=4 is not
default character kind.
R928 alloc-opt is ERRMSG = errmsg-variable
R930 errmsg-variable is scalar-default-char-variable
R906 default-char-variable is variable
C906 default-char-variable shall be default character.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85889] lambda expression can capture structured bindings
Date: Tue, 29 May 2018 19:25:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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>From gcc-bugs-return-605982-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 19:39:39 2018
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From: "bki at hacon dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85961] scratch register rsi used after function call
Date: Tue, 29 May 2018 19:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85961
--- Comment #4 from bki at hacon dot de ---
(In reply to Alexander Monakov from comment #3)
> You'd need to disable IPA-RA after forcing -O2 with the pragma, i.e.:
>
> #pragma GCC optimize "O2"
> #pragma GCC optimize "no-ipa-ra"
Yes, this changes the problematic instruction sequence to:
7e: 48 89 c5 mov %rax,%rbp
81: e8 7a ff ff ff callq 0
<_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv.isra.0>
86: 48 8d 54 05 00 lea 0x0(%rbp,%rax,1),%rdx
Which is better, since rbp is not a scratch register.
> [...]. Do we want to adjust it given that "pragma optimized" is documented as "not suitable for production use"?
I appreciate the explanation which makes sense to me. In the original context,
I did introduce the pragma to reduce compilation times like this:
#pragma GCC optimize "-fno-var-tracking", "-fno-var-tracking-assignments"
So, with instrumentation but without the optimize pragma, scratch registers
will always be considered changed across a function call?
This would then both fix my issue and more general doubts on the feasibility of
my ABI messing. I also agree that the pragma is clearly documented as not fit
for production use and would remove it accordingly. I think I can manage to
pass these options on the command line somehow.
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Subject: [Bug c/85985] New: GCC >= 5.6 unaligned movaps
Date: Tue, 29 May 2018 19:42:00 -0000
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Bug ID: 85985
Summary: GCC >= 5.6 unaligned movaps
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
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Test case:
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
struct aaa {
void *a1;
void *a2;
struct {
void* a3
#if defined(USE_ALIGN) && USE_ALIGN > 0
__attribute__((aligned(64)))
#endif
;
};
};
struct bbb {
volatile int b;
struct aaa A;
};
static void print_A(struct aaa *A) {
printf("a1: %p, %%8=%lu %%16=%lu %%32=%lu\na2: %p, %%8=%lu %%16=%lu
%%32=%lu\n",
&A->a1, ((uint64_t)(&A->a1)) % 8, ((uint64_t)(&A->a1)) % 16,
((uint64_t)(&A->a1)) % 32,
&A->a2, ((uint64_t)(&A->a2)) % 8, ((uint64_t)(&A->a2)) % 16,
((uint64_t)(&A->a2)) % 32);
}
static void __attribute__ ((noinline)) B_init(struct bbb *B) {
B->A.a2 = NULL;
B->A.a1 = NULL;
}
int main(int argc, char *argv[])
{
struct bbb *B;
void *storage = malloc(sizeof(struct bbb)*32);
B = (struct bbb*)((char*)storage + 8);
print_A(&B->A);
B_init(B);
free(storage);
return 0;
}
ASM:
.file "compiler2.c"
.text
.p2align 4,,15
.type B_init, @function
B_init:
.LFB42:
.cfi_startproc
pxor %xmm0, %xmm0
movaps %xmm0, 64(%rdi)
ret
.cfi_endproc
.LFE42:
.size B_init, .-B_init
.section .rodata.str1.8,"aMS",@progbits,1
.align 8
.LC0:
.string "a1: %p, %%8=%lu %%16=%lu %%32=%lu\na2: %p, %%8=%lu %%16=%lu
%%32=%lu\n"
.section .text.startup,"ax",@progbits
.p2align 4,,15
.globl main
.type main, @function
main:
.LFB43:
.cfi_startproc
pushq %rbx
.cfi_def_cfa_offset 16
.cfi_offset 3, -16
movl $6144, %edi
call malloc@PLT
leaq 74(%rax), %rdx
movq %rax, %rbx
leaq 82(%rax), %rax
leaq .LC0(%rip), %rsi
movl $1, %edi
movq %rax, %rcx
movq %rdx, %r9
movq %rdx, %r8
andl $31, %ecx
andl $31, %r9d
andl $15, %r8d
pushq %rcx
.cfi_def_cfa_offset 24
movq %rax, %rcx
andl $15, %ecx
pushq %rcx
.cfi_def_cfa_offset 32
pushq $2
.cfi_def_cfa_offset 40
movl $2, %ecx
pushq %rax
.cfi_def_cfa_offset 48
xorl %eax, %eax
call __printf_chk@PLT
leaq 10(%rbx), %rdi
addq $32, %rsp
.cfi_def_cfa_offset 16
call B_init
movq %rbx, %rdi
call free@PLT
xorl %eax, %eax
popq %rbx
.cfi_def_cfa_offset 8
ret
.cfi_endproc
.LFE43:
.size main, .-main
.ident "GCC: (Ubuntu 7.2.0-8ubuntu3.2) 7.2.0"
.section .note.GNU-stack,"",@progbits
gcc --version
gcc (Ubuntu 7.2.0-8ubuntu3.2) 7.2.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
compile:
gcc -v --save-temps -O3 -o ccc -DUSE_ALIGN=1 -Wall -Wextra compiler2.c
Description:
test always works with GCC 4.6
test works with GCC >= 5.6 and -DUSE_ALIGN=0
test segv on unaligned movaps with GCC >= 5.6 (latest tested GCC 7.2) and
-DUSE_ALIGN=1
This may be a duplicate of https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84525
but the test case here is different. Am I violating the spec with this test?
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Subject: [Bug c/85985] GCC >= 5.6 unaligned movaps
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
.
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Subject: [Bug c/85985] GCC >= 5.6 unaligned movaps
Date: Tue, 29 May 2018 19:47:00 -0000
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The alignment requirement for struct bbb is 64bytes but you cast a non aligned
data to that type.
This is undefined code since the type has an alignment requirement.
>From gcc-bugs-return-605986-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 19:53:39 2018
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Subject: [Bug fortran/85981] ICE in gfc_trans_string_copy, at fortran/trans-expr.c:6539
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kargl at gcc dot gnu.org changed:
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--- Comment #3 from kargl at gcc dot gnu.org ---
I have a patch.
>From gcc-bugs-return-605987-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 19:54:11 2018
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From: "valentinp at mellanox dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85985] GCC >= 5.6 unaligned movaps
Date: Tue, 29 May 2018 19:54:00 -0000
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--- Comment #3 from Valentin Petrov <valentinp at mellanox dot com> ---
Thanks, just to clarify. Do I understand correctly that the alignment
requirement for bbb comes from __attribute__ (aligned) in aaa ?? (attribute
makes a3 to be aligned, which makes aaa to be 64b aligned, which makes bbb 64b
aligned) ?
Is this correct logic?
>From gcc-bugs-return-605988-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 19:56:41 2018
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85985] GCC >= 5.6 unaligned movaps
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--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Valentin Petrov from comment #3)
> Thanks, just to clarify. Do I understand correctly that the alignment
> requirement for bbb comes from __attribute__ (aligned) in aaa ?? (attribute
> makes a3 to be aligned, which makes aaa to be 64b aligned, which makes bbb
> 64b aligned) ?
>
> Is this correct logic?
YES. C11 added _Alignof to see what the alignment is required.
>From gcc-bugs-return-605989-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 20:05:29 2018
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Subject: [Bug c++/67445] New warning: returning std::initializer_list bound to temporary
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--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Tue May 29 20:04:52 2018
New Revision: 260905
URL: https://gcc.gnu.org/viewcvs?rev=260905&root=gcc&view=rev
Log:
PR c++/67445 - returning temporary initializer_list.
PR c++/67711 - assigning from temporary initializer_list.
PR c++/48562 - new initializer_list.
* typeck.c (maybe_warn_about_returning_address_of_local): Also warn
about returning local initializer_list.
* cp-tree.h (AUTO_TEMP_NAME, TEMP_NAME_P): Remove.
* call.c (build_over_call): Warn about assignment from temporary
init_list.
* init.c (build_new_1): Warn about 'new std::initializer_list'.
(find_list_begin, maybe_warn_list_ctor): New.
(perform_member_init): Use maybe_warn_list_ctor.
Added:
trunk/gcc/testsuite/g++.dg/warn/Winit-list1.C
trunk/gcc/testsuite/g++.dg/warn/Winit-list2.C
trunk/gcc/testsuite/g++.dg/warn/Winit-list3.C
Modified:
trunk/gcc/c-family/ChangeLog
trunk/gcc/c-family/c.opt
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/call.c
trunk/gcc/cp/cp-tree.h
trunk/gcc/cp/init.c
trunk/gcc/cp/typeck.c
trunk/gcc/doc/invoke.texi
trunk/gcc/testsuite/c-c++-common/pr43395.c
trunk/gcc/testsuite/g++.dg/cpp1y/pr77591.C
trunk/gcc/testsuite/g++.dg/warn/Wreturn-local-addr.C
trunk/gcc/testsuite/g++.dg/warn/return-reference2.C
trunk/gcc/testsuite/g++.old-deja/g++.bob/array1.C
trunk/gcc/testsuite/g++.old-deja/g++.brendan/crash55.C
trunk/libstdc++-v3/testsuite/util/testsuite_random.h
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Subject: [Bug c++/48562] [C++0x] warn about uses of initializer_list that will lead to dangling pointers
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--- Comment #11 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Tue May 29 20:04:52 2018
New Revision: 260905
URL: https://gcc.gnu.org/viewcvs?rev=260905&root=gcc&view=rev
Log:
PR c++/67445 - returning temporary initializer_list.
PR c++/67711 - assigning from temporary initializer_list.
PR c++/48562 - new initializer_list.
* typeck.c (maybe_warn_about_returning_address_of_local): Also warn
about returning local initializer_list.
* cp-tree.h (AUTO_TEMP_NAME, TEMP_NAME_P): Remove.
* call.c (build_over_call): Warn about assignment from temporary
init_list.
* init.c (build_new_1): Warn about 'new std::initializer_list'.
(find_list_begin, maybe_warn_list_ctor): New.
(perform_member_init): Use maybe_warn_list_ctor.
Added:
trunk/gcc/testsuite/g++.dg/warn/Winit-list1.C
trunk/gcc/testsuite/g++.dg/warn/Winit-list2.C
trunk/gcc/testsuite/g++.dg/warn/Winit-list3.C
Modified:
trunk/gcc/c-family/ChangeLog
trunk/gcc/c-family/c.opt
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/call.c
trunk/gcc/cp/cp-tree.h
trunk/gcc/cp/init.c
trunk/gcc/cp/typeck.c
trunk/gcc/doc/invoke.texi
trunk/gcc/testsuite/c-c++-common/pr43395.c
trunk/gcc/testsuite/g++.dg/cpp1y/pr77591.C
trunk/gcc/testsuite/g++.dg/warn/Wreturn-local-addr.C
trunk/gcc/testsuite/g++.dg/warn/return-reference2.C
trunk/gcc/testsuite/g++.old-deja/g++.bob/array1.C
trunk/gcc/testsuite/g++.old-deja/g++.brendan/crash55.C
trunk/libstdc++-v3/testsuite/util/testsuite_random.h
>From gcc-bugs-return-605990-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 20:05:30 2018
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Subject: [Bug c++/67711] Memory corruption when reassigning value to initializer_list
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--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Tue May 29 20:04:52 2018
New Revision: 260905
URL: https://gcc.gnu.org/viewcvs?rev=260905&root=gcc&view=rev
Log:
PR c++/67445 - returning temporary initializer_list.
PR c++/67711 - assigning from temporary initializer_list.
PR c++/48562 - new initializer_list.
* typeck.c (maybe_warn_about_returning_address_of_local): Also warn
about returning local initializer_list.
* cp-tree.h (AUTO_TEMP_NAME, TEMP_NAME_P): Remove.
* call.c (build_over_call): Warn about assignment from temporary
init_list.
* init.c (build_new_1): Warn about 'new std::initializer_list'.
(find_list_begin, maybe_warn_list_ctor): New.
(perform_member_init): Use maybe_warn_list_ctor.
Added:
trunk/gcc/testsuite/g++.dg/warn/Winit-list1.C
trunk/gcc/testsuite/g++.dg/warn/Winit-list2.C
trunk/gcc/testsuite/g++.dg/warn/Winit-list3.C
Modified:
trunk/gcc/c-family/ChangeLog
trunk/gcc/c-family/c.opt
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/call.c
trunk/gcc/cp/cp-tree.h
trunk/gcc/cp/init.c
trunk/gcc/cp/typeck.c
trunk/gcc/doc/invoke.texi
trunk/gcc/testsuite/c-c++-common/pr43395.c
trunk/gcc/testsuite/g++.dg/cpp1y/pr77591.C
trunk/gcc/testsuite/g++.dg/warn/Wreturn-local-addr.C
trunk/gcc/testsuite/g++.dg/warn/return-reference2.C
trunk/gcc/testsuite/g++.old-deja/g++.bob/array1.C
trunk/gcc/testsuite/g++.old-deja/g++.brendan/crash55.C
trunk/libstdc++-v3/testsuite/util/testsuite_random.h
>From gcc-bugs-return-605992-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 20:36:42 2018
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Subject: [Bug fortran/85981] ICE in gfc_trans_string_copy, at fortran/trans-expr.c:6539
Date: Tue, 29 May 2018 20:36:00 -0000
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--- Comment #4 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Tue, May 29, 2018 at 07:53:33PM +0000, kargl at gcc dot gnu.org wrote:
>
> I have a patch.
>
I have new patch.
>From gcc-bugs-return-605993-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 21:11:30 2018
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Subject: [Bug c++/85976] ICE in cp_tree_equal when building Blitz. May be nested templates.
Date: Tue, 29 May 2018 21:11:00 -0000
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Perhaps cp_tree_equal should just handle USING_DECL like other DECLs.
>From gcc-bugs-return-605994-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 21:16:18 2018
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Subject: [Bug libfortran/85975] Incorrect size for spread array
Date: Tue, 29 May 2018 21:16:00 -0000
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-29
CC| |kargl at gcc dot gnu.org,
| |pault at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |kargl at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from kargl at gcc dot gnu.org ---
Stephan,
I tried the simply patch suggested in your analysis and
it does fix the problem. I need to extend the patch to
fix the m4 files that utilize the macro as the 'b'
parameter is no longer needed.
I've also Paul to the CC list. He finished and sheparded
the array descriptor reform into the tree. Paul, does
Stephan's analysis look correct?
>From gcc-bugs-return-605995-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 21:22:47 2018
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Subject: [Bug target/85984] ICE in create_pseudo_cfg, at dwarf2cfi.c:2874
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86_64-*-*
Component|c |target
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This code is undefined at runtime due to the use of naked and C code.
>From gcc-bugs-return-605996-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 21:50:15 2018
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Subject: [Bug target/85986] New: config/rl78/rl78.c:984: bad test ?
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Bug ID: 85986
Summary: config/rl78/rl78.c:984: bad test ?
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
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Target: rl78
rl78/rl78.c:984:4: warning: logical ‘and’ of mutually exclusive tests is always
false [-Wlogical-op]
Source code is
if (GET_CODE (XEXP (x, 0)) == SYMBOL_REF
&& GET_CODE (XEXP (x, 0)) == CONST_INT)
Maybe better code
if (GET_CODE (XEXP (x, 0)) == SYMBOL_REF
|| GET_CODE (XEXP (x, 0)) == CONST_INT)
>From gcc-bugs-return-605997-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 21:51:06 2018
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Subject: [Bug tree-optimization/85987] New: cstore does not work with a store in one of the branches
Date: Tue, 29 May 2018 21:51:00 -0000
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Bug ID: 85987
Summary: cstore does not work with a store in one of the
branches
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
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Take:
int PolyMod(int s);
void CreateChecksum(int isTestNet, int *mod, int *t) {
if (isTestNet == 0) {
*t += 1;
*mod = (5);
} else {
*mod = (9);
}
}
Cstore does not work here and commonize the store to mod.
>From gcc-bugs-return-605998-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 21:52:05 2018
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Subject: [Bug tree-optimization/85971] Really Simple "If" with one function call inside is not optimized efficiently
Date: Tue, 29 May 2018 21:52:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Depends on| |85987
Severity|normal |enhancement
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I think this is actually two different bugs.
One where cstore is not working when there is a function call inbetween.
If I add an argument to CreateChecksum and change the first PolyMod to + t and
the second PolyMod to * t. the cstore optimization work. This is recorded
now as PR 85987.
The second one is the lowering of common function calls with slightly different
arguments. I thought I saw one asking for this one but I can't find it.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85987
[Bug 85987] cstore does not work with a store in one of the branches
>From gcc-bugs-return-605999-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 21:53:24 2018
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Subject: [Bug target/85986] config/rl78/rl78.c:984: bad test ?
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David Binderman <dcb314 at hotmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dj at gcc dot gnu.org
--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
svn blame says
181819 dj if (GET_CODE (XEXP (x, 0)) == SYMBOL_REF
181819 dj && GET_CODE (XEXP (x, 0)) == CONST_INT)
>From gcc-bugs-return-606000-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 22:07:02 2018
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Subject: [Bug c++/53281] poor error message for calling a non-const method from a const object
Date: Tue, 29 May 2018 22:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53281
--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
My patch fails to account for ref-qualifiers on the member function, so needs
some improvement.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85964] compile time hog w/ -O3 -ftracer -fno-guess-branch-probability
Date: Tue, 29 May 2018 22:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85964
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[8/9 Regression] Compile |compile time hog w/ -O3
|time hog w/ -O3 -ftracer |-ftracer
|-fno-guess-branch-probabili |-fno-guess-branch-probabili
|ty |ty
--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Not a regression since #pragma GCC unroll is new.
>From gcc-bugs-return-606002-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 29 22:14:39 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++/85889] lambda expression can capture structured bindings
Date: Tue, 29 May 2018 22:14:00 -0000
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Ville Voutilainen <ville.voutilainen at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ville.voutilainen at gmail dot com
--- Comment #2 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
Please suspend this bug. The change that made capturing bindings ill-formed in
P0588R1 was not in the design paper P0588R0. I plan to propose to revert this
change, and make capturing structured bindings well-defined in all standard
versions that support structured bindings.
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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libitm/85988] New: Incorrect offset of __private_tm
Date: Tue, 29 May 2018 22:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85988
Bug ID: 85988
Summary: Incorrect offset of __private_tm
Product: gcc
Version: 9.0
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Priority: P3
Component: libitm
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Target: x86-64-*-linux*
In glibc, sysdeps/i386/nptl/tls.h has
typedef struct
{
void *tcb; /* Pointer to the TCB. Not necessarily the
thread descriptor used by libpthread. */
dtv_t *dtv;
void *self; /* Pointer to the thread descriptor. */
int multiple_threads;
uintptr_t sysinfo;
uintptr_t stack_guard;
uintptr_t pointer_guard;
int gscope_flag;
int __glibc_reserved1;
/* Reservation of some values for the TM ABI. */
void *__private_tm[4];
/* GCC split stack support. */
void *__private_ss;
} tcbhead_t;
and sysdeps/x86_64/nptl/tls.h has
typedef struct
{
void *tcb; /* Pointer to the TCB. Not necessarily the
thread descriptor used by libpthread. */
dtv_t *dtv;
void *self; /* Pointer to the thread descriptor. */
int multiple_threads;
int gscope_flag;
uintptr_t sysinfo;
uintptr_t stack_guard;
uintptr_t pointer_guard;
unsigned long int vgetcpu_cache[2];
int __glibc_reserved1;
int __glibc_unused1;
/* Reservation of some values for the TM ABI. */
void *__private_tm[4];
/* GCC split stack support. */
void *__private_ss;
long int __glibc_reserved2;
/* Must be kept even if it is no longer used by glibc since programs,
like AddressSanitizer, depend on the size of tcbhead_t. */
__128bits __glibc_unused2[8][4] __attribute__ ((aligned (32)));
void *__padding[8];
} tcbhead_t;
The offsets of __private_tm are
i386: 36 bytes != 4 * 10 bytes
x32: 48 bytes != 4 * 10 btes
x86_64: 80 bytes == 8 * 10 bytes
But config/linux/x86/tls.h has
#ifdef __x86_64__
#ifdef __LP64__
# define SEG_READ(OFS) "movq\t%%fs:(" #OFS "*8),%0"
# define SEG_WRITE(OFS) "movq\t%0,%%fs:(" #OFS "*8)"
# define SEG_DECODE_READ(OFS) SEG_READ(OFS) "\n\t" \
"rorq\t$17,%0\n\t" \
"xorq\t%%fs:48,%0"
# define SEG_ENCODE_WRITE(OFS) "xorq\t%%fs:48,%0\n\t" \
"rolq\t$17,%0\n\t" \
SEG_WRITE(OFS)
#else
// For X32.
# define SEG_READ(OFS) "movl\t%%fs:(" #OFS "*4),%0"
# define SEG_WRITE(OFS) "movl\t%0,%%fs:(" #OFS "*4)"
# define SEG_DECODE_READ(OFS) SEG_READ(OFS) "\n\t" \
"rorl\t$9,%0\n\t" \
"xorl\t%%fs:24,%0"
# define SEG_ENCODE_WRITE(OFS) "xorl\t%%fs:24,%0\n\t" \
"roll\t$9,%0\n\t" \
SEG_WRITE(OFS)
#endif
#else
# define SEG_READ(OFS) "movl\t%%gs:(" #OFS "*4),%0"
# define SEG_WRITE(OFS) "movl\t%0,%%gs:(" #OFS "*4)"
# define SEG_DECODE_READ(OFS) SEG_READ(OFS) "\n\t" \
"rorl\t$9,%0\n\t" \
"xorl\t%%gs:24,%0"
# define SEG_ENCODE_WRITE(OFS) "xorl\t%%gs:24,%0\n\t" \
"roll\t$9,%0\n\t" \
SEG_WRITE(OFS)
#endif
static inline struct gtm_thread *gtm_thr(void)
{
struct gtm_thread *r;
asm volatile (SEG_READ(10) : "=r"(r));
return r;
}
static inline void set_gtm_thr(struct gtm_thread *x)
{
asm volatile (SEG_WRITE(10) : : "r"(x));
}amespace GTM HIDDEN {
static inline struct abi_dispatch *abi_disp(void)
{
struct abi_dispatch *r;
asm volatile (SEG_DECODE_READ(11) : "=r"(r));
return r;
}
static inline void set_abi_disp(struct abi_dispatch *x)
{
void *scratch;
asm volatile (SEG_ENCODE_WRITE(11) : "=r"(scratch) : "0"(x));
}
SEG_* macros are correct only for x86-64.
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Subject: [Bug c++/85889] lambda expression can capture structured bindings
Date: Tue, 29 May 2018 22:19:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |SUSPENDED
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Done.
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Subject: [Bug fortran/85981] ICE in gfc_trans_string_copy, at fortran/trans-expr.c:6539
Date: Tue, 29 May 2018 23:27:00 -0000
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--- Comment #5 from kargl at gcc dot gnu.org ---
Patch submitted.
https://gcc.gnu.org/ml/gcc-patches/2018-05/msg01694.html
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/85989] New: Incorrect result for example involving unary minus in a loop
Date: Wed, 30 May 2018 00:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85989
Bug ID: 85989
Summary: Incorrect result for example involving unary minus in
a loop
Product: gcc
Version: 6.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Created attachment 44208
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44208&action=edit
Preprocessed reproduction file
Please see the attached file 'standalone.i'. When I run this in -O0 I see the
result
gcc -Wall -Wstrict-aliasing=0 -O0 standalone.i -o standalone
./standalone
--> 0
--> 0
This is what I expect. If I compile with '-O1' I see
gcc -Wall -Wstrict-aliasing=0 -O1 standalone.i -o standalone
./standalone
--> 8
--> 8
Which is unexpected. I poked around in gdb and stared at the asm in godbolt and
it seems like the negation is being omitted in the following loop:
for (b_P5 = 0; b_P5 < 8; b_P5++) {
P26 = P29;
P29 = -(int)*P5;
}
Here is my gcc info
Using built-in specs.
COLLECT_GCC=[SNIP]/glnxa64/gcc-6.3.0/bin/gcc
COLLECT_LTO_WRAPPER=[SNIP]/glnxa64/gcc-6.3.0/bin/../libexec/gcc/x86_64-pc-linux-gnu/6.3.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: [SNIP]/sources/gcc-6.3/configure
--with-gmp=[SNIP]/glnxa64/gcc-6.3/gmp-4.3 --with-mpfr=[SNIP]/gcc-6.3/mpfr
--with-mpc=[SNIP]/gcc-6.3/mpc --enable-languages=c,c++,fortran
--with-bugurl=[SNIP],_Debugging --enable-shared --enable-linker-build-id
--enable-plugin --enable-checking=release --enable-multiarch --enable-gold
--enable-ld=default --enable-libstdcxx-time=no
--prefix=[SNIP]/glnxa64/gcc-6.3.0 --with-pkgversion='MW GCC 6.3.0-GLIBC2.12'
--with-tune=generic --with-system-zlib --enable-multilib
--with-multilib-list=m32,m64 --with-arch-directory=amd64 --with-arch-32=i586
--with-abi=m64
Thread model: posix
gcc version 6.3.0 (MW GCC 6.3.0-GLIBC2.12)
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Subject: [Bug target/85990] New: Wrong TARGET_THREAD_SPLIT_STACK_OFFSET
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85990
Bug ID: 85990
Summary: Wrong TARGET_THREAD_SPLIT_STACK_OFFSET
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
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CC: ubizjak at gmail dot com
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Target: i*86-pc-linux-gnu
In glibc, sysdeps/i386/nptl/tls.h has
typedef struct
{
void *tcb; /* Pointer to the TCB. Not necessarily the
thread descriptor used by libpthread. */
dtv_t *dtv;
void *self; /* Pointer to the thread descriptor. */
int multiple_threads;
uintptr_t sysinfo;
uintptr_t stack_guard;
uintptr_t pointer_guard;
int gscope_flag;
int __glibc_reserved1;
/* Reservation of some values for the TM ABI. */
void *__private_tm[4];
/* GCC split stack support. */
void *__private_ss;
} tcbhead_t;
and sysdeps/x86_64/nptl/tls.h has
typedef struct
{
void *tcb; /* Pointer to the TCB. Not necessarily the
thread descriptor used by libpthread. */
dtv_t *dtv;
void *self; /* Pointer to the thread descriptor. */
int multiple_threads;
int gscope_flag;
uintptr_t sysinfo;
uintptr_t stack_guard;
uintptr_t pointer_guard;
unsigned long int vgetcpu_cache[2];
int __glibc_reserved1;
int __glibc_unused1;
/* Reservation of some values for the TM ABI. */
void *__private_tm[4];
/* GCC split stack support. */
void *__private_ss;
long int __glibc_reserved2;
/* Must be kept even if it is no longer used by glibc since programs,
like AddressSanitizer, depend on the size of tcbhead_t. */
__128bits __glibc_unused2[8][4] __attribute__ ((aligned (32)));
void *__padding[8];
} tcbhead_t;
The offsets of __private_tm are
i386: 36 bytes
x32: 48 bytes
x86_64: 80 bytes
gcc/config/i386/gnu-user64.h has
/* We steal the last transactional memory word. */
#define TARGET_THREAD_SPLIT_STACK_OFFSET \
(TARGET_64BIT ? (TARGET_X32 ? 0x40 : 0x70) : 0x30)
Should't it be
(TARGET_64BIT ? (TARGET_X32 ? 0x40 : 0x70) : 0x34)
>From gcc-bugs-return-606008-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 03:37:11 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85991] New: [Concepts] Template placeholder: ICE cp_parser_lookup_name, at cp/parser.c:26223
Date: Wed, 30 May 2018 03:37:00 -0000
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Bug ID: 85991
Summary: [Concepts] Template placeholder: ICE
cp_parser_lookup_name, at cp/parser.c:26223
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
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Component: c++
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When a partial-concept-id is formed for a concept with a template prototype
template parameter, GCC ICEs.
### SOURCE (<stdin>):
template <template <typename> class, int> concept bool TmplC = true;
template <template <typename> class> struct A;
void f(A<TmplC<0>> *);
### COMPILER INVOCATION COMMAND:
g++ -fsyntax-only -xc++ -fconcepts -
### ACTUAL OUTPUT:
<stdin>:3:17: internal compiler error: in cp_parser_lookup_name, at
cp/parser.c:26223
0x58ed8d cp_parser_lookup_name
../../source/gcc/cp/parser.c:26223
0x680e29 cp_parser_primary_expression
../../source/gcc/cp/parser.c:5528
0x6825f5 cp_parser_primary_expression
../../source/gcc/cp/parser.c:5637
0x6825f5 cp_parser_template_argument
../../source/gcc/cp/parser.c:16465
0x6825f5 cp_parser_template_argument_list
../../source/gcc/cp/parser.c:16274
0x6825f5 cp_parser_enclosed_template_argument_list
../../source/gcc/cp/parser.c:27695
0x682f4e cp_parser_template_id
../../source/gcc/cp/parser.c:15917
0x683498 cp_parser_class_name
../../source/gcc/cp/parser.c:22491
0x68e837 cp_parser_qualifying_entity
../../source/gcc/cp/parser.c:6564
0x68e837 cp_parser_nested_name_specifier_opt
../../source/gcc/cp/parser.c:6250
0x6901a6 cp_parser_simple_type_specifier
../../source/gcc/cp/parser.c:17283
0x68a9f3 cp_parser_type_specifier
../../source/gcc/cp/parser.c:16956
0x696b2b cp_parser_decl_specifier_seq
../../source/gcc/cp/parser.c:13718
0x6971bb cp_parser_parameter_declaration
../../source/gcc/cp/parser.c:21607
0x697aef cp_parser_parameter_declaration_list
../../source/gcc/cp/parser.c:21433
0x697e43 cp_parser_parameter_declaration_clause
../../source/gcc/cp/parser.c:21362
0x687148 cp_parser_direct_declarator
../../source/gcc/cp/parser.c:20121
0x687148 cp_parser_declarator
../../source/gcc/cp/parser.c:19993
0x694b91 cp_parser_init_declarator
../../source/gcc/cp/parser.c:19509
0x69be63 cp_parser_simple_declaration
../../source/gcc/cp/parser.c:13150
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.
### EXPECTED OUTPUT:
(No ICE).
### COMPILER VERSION INFO (g++ -v):
Using built-in specs.
COLLECT_GCC=/opt/wandbox/gcc-head/bin/g++
COLLECT_LTO_WRAPPER=/opt/wandbox/gcc-head/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../source/configure --prefix=/opt/wandbox/gcc-head
--enable-languages=c,c++ --disable-multilib --without-ppl --without-cloog-ppl
--enable-checking=release --disable-nls --enable-lto
LDFLAGS=-Wl,-rpath,/opt/wandbox/gcc-head/lib,-rpath,/opt/wandbox/gcc-head/lib64,-rpath,/opt/wandbox/gcc-head/lib32
Thread model: posix
gcc version 9.0.0 20180528 (experimental) (GCC)
>From gcc-bugs-return-606009-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 03:40:59 2018
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Subject: [Bug libitm/85988] Incorrect offsets of __private_tm and pointer_guard
Date: Wed, 30 May 2018 03:40:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ubizjak at gmail dot com
Summary|Incorrect offset of |Incorrect offsets of
|__private_tm |__private_tm and
| |pointer_guard
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
The offsets of pointer_guard are:
i386: 24 bytes == 24 bytes
x32: 28 bytes != 24 bytes
x86_64: 48 bytes == 48 bytes
>From gcc-bugs-return-606010-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 04:05:26 2018
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Subject: [Bug c/85957] i686: Integers appear to be different, but compare as equal
Date: Wed, 30 May 2018 04:05:00 -0000
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--- Comment #8 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
To expand a bit: DOM makes the small testcase behave as if 'b' and 'ib' are
evaluated twice:
* one time, 'b' is evaluated in precision matching 'a' (either infinite or
double), and 'ib' is evaluated to 1; this instance is used in 'ia == ib'
comparison;
* a second time, 'b' is evaluated in extended precision and 'ib' is evaluated
to 0; this instance is passed as the last argument to printf.
This is surprising as the original program clearly evaluates 'b' and 'ib' just
once.
If there's no bug in DOM and the observed transformation is allowed to happen
when -fexcess-precision=fast is in effect, I think it would be nice to mention
that in the compiler manual.
>From gcc-bugs-return-606011-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 04:16:27 2018
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Subject: [Bug c/85957] i686: Integers appear to be different, but compare as equal
Date: Wed, 30 May 2018 04:16:00 -0000
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--- Comment #9 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Sorry, the above comment should have said 'b * 1e6' every time it said 'b'.
>From gcc-bugs-return-606012-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 06:07:01 2018
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Subject: [Bug c/85957] i686: Integers appear to be different, but compare as equal
Date: Wed, 30 May 2018 06:07:00 -0000
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--- Comment #10 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Also note that both the original and the reduced testcase can be tweaked to
exhibit the surprising transformation even when -fexcess-precision=standard is
enabled. A "lazy" way is via -mpc64, but I think it's possible even without the
additional option (by making the code more convoluted to enforce rounding to
double). Here's what happens on the reduced testcase:
$ gcc -m32 d.c -O -fdisable-tree-dom3 && ./a.out
cc1: note: disable pass tree-dom3 for functions in the range of [0, 4294967295]
1 == 0
$ gcc -m32 d.c -O -fdisable-tree-dom3 -fexcess-precision=standard -mpc64 &&
./a.out
cc1: note: disable pass tree-dom3 for functions in the range of [0, 4294967295]
0 == 1
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Subject: [Bug c/84168] Please backport "Avoid assembler warnings from AArch64 constructor/destructor priorities."
Date: Wed, 30 May 2018 06:34:00 -0000
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--- Comment #3 from Frank Mehnert <frank.mehnert at googlemail dot com> ---
Sorry for the late response and thanks for bringing this up on gcc-patches.
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Subject: [Bug tree-optimization/85964] compile time hog w/ -O3 -ftracer -fno-guess-branch-probability
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85964
--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Eric Botcazou from comment #7)
> Not a regression since #pragma GCC unroll is new.
Note that https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85964#c2 provides
test-case that does not use GCC unroll.
I see following starting revision with following timeouts:
5s: r250338
10s: r250338
20s: r254379
That said I would classify that as regression.
>From gcc-bugs-return-606015-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 07:20:02 2018
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Subject: [Bug target/85683] [8 Regression] GCC 8 stopped using RMW (Read Modify Write) instructions on x86[_64]
Date: Wed, 30 May 2018 07:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85683
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed May 30 07:19:24 2018
New Revision: 260915
URL: https://gcc.gnu.org/viewcvs?rev=260915&root=gcc&view=rev
Log:
Backported from mainline
2018-05-08 Jakub Jelinek <jakub@redhat.com>
PR target/85683
* config/i386/i386.md: Add peepholes for mem {+,-,&,|,^}= x; mem != 0
after cmpelim optimization.
* gcc.target/i386/pr49095.c: Add -masm=att to dg-options. Add
scan-assembler-times checking that except for [fh]*xor other functions
don't use any load instructions.
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/config/i386/i386.md
branches/gcc-8-branch/gcc/testsuite/ChangeLog
branches/gcc-8-branch/gcc/testsuite/gcc.target/i386/pr49095.c
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Subject: [Bug c++/85662] [8/9 Regression] "error: non-constant condition for static assertion" from __builtin_offsetof in C++
Date: Wed, 30 May 2018 07:21:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85662
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed May 30 07:20:58 2018
New Revision: 260916
URL: https://gcc.gnu.org/viewcvs?rev=260916&root=gcc&view=rev
Log:
Backported from mainline
2018-05-10 Jakub Jelinek <jakub@redhat.com>
PR c++/85662
* c-common.h (fold_offsetof_1): Removed.
(fold_offsetof): Add TYPE argument defaulted to size_type_node and
CTX argument defaulted to ERROR_MARK.
* c-common.c (fold_offsetof_1): Renamed to ...
(fold_offsetof): ... this. Remove wrapper function. Add TYPE
argument, convert the pointer constant to TYPE and use size_binop
with PLUS_EXPR instead of fold_build_pointer_plus if type is not
a pointer type. Adjust recursive calls.
* c-fold.c (c_fully_fold_internal): Use fold_offsetof rather than
fold_offsetof_1, pass TREE_TYPE (expr) as TYPE to it and drop the
fold_convert_loc.
* c-typeck.c (build_unary_op): Use fold_offsetof rather than
fold_offsetof_1, pass argtype as TYPE to it and drop the
fold_convert_loc.
* cp-gimplify.c (cp_fold): Use fold_offsetof rather than
fold_offsetof_1, pass TREE_TYPE (x) as TYPE to it and drop the
fold_convert.
* g++.dg/ext/offsetof2.C: New test.
Added:
branches/gcc-8-branch/gcc/testsuite/g++.dg/ext/offsetof2.C
Modified:
branches/gcc-8-branch/gcc/c-family/ChangeLog
branches/gcc-8-branch/gcc/c-family/c-common.c
branches/gcc-8-branch/gcc/c-family/c-common.h
branches/gcc-8-branch/gcc/c/ChangeLog
branches/gcc-8-branch/gcc/c/c-fold.c
branches/gcc-8-branch/gcc/c/c-typeck.c
branches/gcc-8-branch/gcc/cp/ChangeLog
branches/gcc-8-branch/gcc/cp/cp-gimplify.c
branches/gcc-8-branch/gcc/testsuite/ChangeLog
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From: "mpeddie at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/85992] New: Invalid optimization with atanf
Date: Wed, 30 May 2018 07:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85992
Bug ID: 85992
Summary: Invalid optimization with atanf
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
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Created attachment 44209
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44209&action=edit
Preprocessed source file
I apologize again if I've chosen the wrong category for this bug; I don't know
what's the correct choice.
The output from my small test program varies depending on whether I enable
optimizations with -O. The un-preprocessed program is the following
(preprocessed output attached):
#include <stdio.h>
#include <math.h>
static float example(const int i, const float f)
{
return atanf(i == 0 ? f : 3.141593F);
}
int main(void)
{
printf("atanf(3.141593F) = %.8f\n", example(1, 0.0F));
return 0;
}
With optimizations enabled, this prints
atanf(3.141593F) = 1.26262724
Without optimizations, it prints
atanf(3.141593F) = 1.26262736
I'm not certain which of these is correct, but I expect them to be the same.
(GNU MPFR tells me the result should be 1.2626272439 for a 24-bit significand,
which is close to that of the optimized version.) The results differ by one
bit; the optimized program's output value is 0x3FA19DC6, and the unoptimized
program's output is 0x3FA19DC5. If I move the call to atanf() into the main
function, the program is consistent, always outputting 1.26262724 (like the
optimized version of the program above).
The attached file test.i is the preprocessed source file. The test program
compiles without errors or warnings and never triggers the undefined-behavior
sanitizer. I've observed the same problem with gcc version 7.3.0, 6.4.0 and
5.5.0 for x86_64. Below is the command-line invocation of gcc along with its
complete output.
gcc-8 -v -save-temps -O -Wall -Wextra -Werror -fsanitize=undefined
-fno-strict-aliasing -fwrapv -fno-aggressive-loop-optimizations -lm test.c -o
test
Using built-in specs.
COLLECT_GCC=gcc-8
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 8.1.0-3'
--with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-8
--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 8.1.0 (Debian 8.1.0-3)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O' '-Wall' '-Wextra' '-Werror'
'-fsanitize=undefined' '-fno-strict-aliasing' '-fwrapv'
'-fno-aggressive-loop-optimizations' '-o' 'test' '-mtune=generic'
'-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/8/cc1 -E -quiet -v -imultiarch x86_64-linux-gnu
test.c -mtune=generic -march=x86-64 -Wall -Wextra -Werror -fsanitize=undefined
-fno-strict-aliasing -fwrapv -fno-aggressive-loop-optimizations -O
-fpch-preprocess -o test.i
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/8/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/x86_64-linux-gnu/8/include
/usr/local/include
/usr/lib/gcc/x86_64-linux-gnu/8/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O' '-Wall' '-Wextra' '-Werror'
'-fsanitize=undefined' '-fno-strict-aliasing' '-fwrapv'
'-fno-aggressive-loop-optimizations' '-o' 'test' '-mtune=generic'
'-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/8/cc1 -fpreprocessed test.i -quiet -dumpbase
test.c -mtune=generic -march=x86-64 -auxbase test -O -Wall -Wextra -Werror
-version -fsanitize=undefined -fno-strict-aliasing -fwrapv
-fno-aggressive-loop-optimizations -o test.s
GNU C17 (Debian 8.1.0-3) version 8.1.0 (x86_64-linux-gnu)
compiled by GNU C version 8.1.0, GMP version 6.1.2, MPFR version 4.0.1,
MPC version 1.1.0, isl version isl-0.19-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C17 (Debian 8.1.0-3) version 8.1.0 (x86_64-linux-gnu)
compiled by GNU C version 8.1.0, GMP version 6.1.2, MPFR version 4.0.1,
MPC version 1.1.0, isl version isl-0.19-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: bbc65a5a9118b9b79402871f4ead4543
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O' '-Wall' '-Wextra' '-Werror'
'-fsanitize=undefined' '-fno-strict-aliasing' '-fwrapv'
'-fno-aggressive-loop-optimizations' '-o' 'test' '-mtune=generic'
'-march=x86-64'
as -v --64 -o test.o test.s
GNU assembler version 2.30 (x86_64-linux-gnu) using BFD version (GNU Binutils
for Debian) 2.30
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/8/:/usr/lib/gcc/x86_64-linux-gnu/8/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/8/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/8/:/usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/8/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O' '-Wall' '-Wextra' '-Werror'
'-fsanitize=undefined' '-fno-strict-aliasing' '-fwrapv'
'-fno-aggressive-loop-optimizations' '-o' 'test' '-mtune=generic'
'-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/8/collect2 -plugin
/usr/lib/gcc/x86_64-linux-gnu/8/liblto_plugin.so
-plugin-opt=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
-plugin-opt=-fresolution=test.res -plugin-opt=-pass-through=-lgcc
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s --sysroot=/
--build-id --eh-frame-hdr -m elf_x86_64 --hash-style=gnu -dynamic-linker
/lib64/ld-linux-x86-64.so.2 -pie -o test
/usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/Scrt1.o
/usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/crti.o
/usr/lib/gcc/x86_64-linux-gnu/8/crtbeginS.o -L/usr/lib/gcc/x86_64-linux-gnu/8
-L/usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu
-L/usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib -L/lib/x86_64-linux-gnu
-L/lib/../lib -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib
-L/usr/lib/gcc/x86_64-linux-gnu/8/../../.. -lm test.o -lubsan -lgcc
--push-state --as-needed -lgcc_s --pop-state -lc -lgcc --push-state --as-needed
-lgcc_s --pop-state /usr/lib/gcc/x86_64-linux-gnu/8/crtendS.o
/usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/crtn.o
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O' '-Wall' '-Wextra' '-Werror'
'-fsanitize=undefined' '-fno-strict-aliasing' '-fwrapv'
'-fno-aggressive-loop-optimizations' '-o' 'test' '-mtune=generic'
'-march=x86-64'
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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85993] New: config/sh/sh.c:10878: suspicious if .. else chain
Date: Wed, 30 May 2018 07:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85993
Bug ID: 85993
Summary: config/sh/sh.c:10878: suspicious if .. else chain
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
Target Milestone: ---
Target: sh
config/sh/sh.c:10878:12: warning: duplicated ‘if’ condition [-Wduplicated-cond]
Source code is
else if (scratch0 != scratch1)
{
emit_move_insn (scratch1, GEN_INT (vcall_offset));
emit_insn (gen_add2_insn (scratch0, scratch1));
offset_addr = scratch0;
}
but earlier is code
else if (scratch0 != scratch1)
{
/* scratch0 != scratch1, and we have indexed loads. Get better
schedule by loading the offset into r1 and using an indexed
load - then the load of r1 can issue before the load from
(this_rtx + delta) finishes. */
emit_move_insn (scratch1, GEN_INT (vcall_offset));
offset_addr = gen_rtx_PLUS (Pmode, scratch0, scratch1);
}
Interestingly, the two blocks of code in the ifs aren't the same.
>From gcc-bugs-return-606019-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 07:35:48 2018
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Subject: [Bug c/85696] OpenMP with variably modified and default(none) won't compile
Date: Wed, 30 May 2018 07:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85696
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed May 30 07:34:56 2018
New Revision: 260917
URL: https://gcc.gnu.org/viewcvs?rev=260917&root=gcc&view=rev
Log:
Backported from mainline
2018-05-11 Jakub Jelinek <jakub@redhat.com>
PR c/85696
* c-omp.c (c_omp_predetermined_sharing): Return
OMP_CLAUSE_DEFAULT_SHARED for artificial vars with integral type.
* cp-tree.h (cxx_omp_predetermined_sharing_1): New prototype.
* cp-gimplify.c (cxx_omp_predetermined_sharing): New wrapper around
cxx_omp_predetermined_sharing_1. Rename old function to ...
(cxx_omp_predetermined_sharing_1): ... this.
* semantics.c (finish_omp_clauses): Use cxx_omp_predetermined_sharing_1
instead of cxx_omp_predetermined_sharing.
* c-c++-common/gomp/pr85696.c: New test.
Added:
branches/gcc-8-branch/gcc/testsuite/c-c++-common/gomp/pr85696.c
Modified:
branches/gcc-8-branch/gcc/c-family/ChangeLog
branches/gcc-8-branch/gcc/c-family/c-omp.c
branches/gcc-8-branch/gcc/cp/ChangeLog
branches/gcc-8-branch/gcc/cp/cp-gimplify.c
branches/gcc-8-branch/gcc/cp/cp-tree.h
branches/gcc-8-branch/gcc/cp/semantics.c
branches/gcc-8-branch/gcc/testsuite/ChangeLog
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Subject: [Bug target/85756] [9 regression] wrong code at -Os on x86-64-linux-gnu in 32-bit mode
Date: Wed, 30 May 2018 07:36:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85756
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed May 30 07:35:48 2018
New Revision: 260918
URL: https://gcc.gnu.org/viewcvs?rev=260918&root=gcc&view=rev
Log:
Backported from mainline
2018-05-14 Jakub Jelinek <jakub@redhat.com>
PR target/85756
* config/i386/i386.md: Disallow non-commutative arithmetics in
last twpeephole for mem {+,-,&,|,^}= x; mem != 0 after cmpelim
optimization. Use COMMUTATIVE_ARITH_P test rather than != MINUS
in the peephole2 before it.
* gcc.c-torture/execute/pr85756.c: New test.
Added:
branches/gcc-8-branch/gcc/testsuite/gcc.c-torture/execute/pr85756.c
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/config/i386/i386.md
branches/gcc-8-branch/gcc/testsuite/ChangeLog
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Subject: [Bug c++/85952] Bogus -Wunused-but-set-variable warning with array structured binding
Date: Wed, 30 May 2018 07:37:00 -0000
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed May 30 07:36:49 2018
New Revision: 260919
URL: https://gcc.gnu.org/viewcvs?rev=260919&root=gcc&view=rev
Log:
Backported from mainline
2018-05-29 Jakub Jelinek <jakub@redhat.com>
PR c++/85952
* init.c (build_aggr_init): For structured binding initialized from
array call mark_rvalue_use on the initializer.
* g++.dg/warn/Wunused-var-33.C: New test.
Added:
branches/gcc-8-branch/gcc/testsuite/g++.dg/warn/Wunused-var-33.C
Modified:
branches/gcc-8-branch/gcc/cp/ChangeLog
branches/gcc-8-branch/gcc/cp/init.c
branches/gcc-8-branch/gcc/testsuite/ChangeLog
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Subject: [Bug libfortran/85975] Incorrect size for spread array
Date: Wed, 30 May 2018 07:51:00 -0000
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--- Comment #2 from Paul Thomas <pault at gcc dot gnu.org> ---
(In reply to kargl from comment #1)
> Stephan,
>
> I tried the simply patch suggested in your analysis and
> it does fix the problem. I need to extend the patch to
> fix the m4 files that utilize the macro as the 'b'
> parameter is no longer needed.
>
> I've also Paul to the CC list. He finished and sheparded
> the array descriptor reform into the tree. Paul, does
> Stephan's analysis look correct?
Yes, the logic is impeccable and the patch still better :-)
Thanks for the report and the fix, Stephan.
Steve, can you do the honors with this please? I am still pressed by daytime
work and will be for another two-three weeks.
Paul
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Subject: [Bug target/85683] [8 Regression] GCC 8 stopped using RMW (Read Modify Write) instructions on x86[_64]
Date: Wed, 30 May 2018 07:57:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Resolution|--- |FIXED
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed for 8.2+.
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Subject: [Bug c/85696] OpenMP with variably modified and default(none) won't compile
Date: Wed, 30 May 2018 07:59:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed for 8.2+.
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Subject: [Bug c++/85662] [8/9 Regression] "error: non-constant condition for static assertion" from __builtin_offsetof in C++
Date: Wed, 30 May 2018 07:59:00 -0000
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--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed for 8.2+. As I said, can't reproduce with GCC 7.
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Subject: [Bug c++/85952] Bogus -Wunused-but-set-variable warning with array structured binding
Date: Wed, 30 May 2018 07:59:00 -0000
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed for 8.2+ so far.
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Subject: [Bug tree-optimization/85964] [8/9 Regression] compile time hog w/ -O3 -ftracer -fno-guess-branch-probability
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85964
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hubicka at gcc dot gnu.org
Known to work| |7.3.0
Summary|compile time hog w/ -O3 |[8/9 Regression] compile
|-ftracer |time hog w/ -O3 -ftracer
|-fno-guess-branch-probabili |-fno-guess-branch-probabili
|ty |ty
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #8)
> (In reply to Eric Botcazou from comment #7)
> > Not a regression since #pragma GCC unroll is new.
>
> Note that https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85964#c2 provides
> test-case that does not use GCC unroll.
>
> I see following starting revision with following timeouts:
>
> 5s: r250338
> 10s: r250338
> 20s: r254379
>
> That said I would classify that as regression.
Agreed.
Note for this testcase the behavior looks similar. I cut the # of calls in
half
and get for 8.1:
tree CFG cleanup : 15.12 ( 61%) 0.00 ( 0%) 15.07 ( 60%)
2101 kB ( 4%)
backwards jump threading : 8.36 ( 34%) 0.00 ( 0%) 8.36 ( 33%)
0 kB ( 0%)
while 7.3 has no time spent in those.
I guess the real issue is the tracer pass mis-behaving with
-fno-guess-branch-probabilities since it looks like it will just compute
"random" best traces
if there's no probabilities/counts initialized.
There's obvious disconnect in find_best_{predecessor,successor} and I'm missing
code that makes them return NULL in case that "best" pred/succ doesn't have
profile initialized on the corresponding edge or src/dest BB.
Honza? The following avoids doing anything in tracer to the testcase.
Btw, -ftracer doesn't seem to be needed to
reproduce the backward threading part of this issue, just the CFG cleanup
part (it's tracers CFG cleanup that needs this much time).
diff --git a/gcc/tracer.c b/gcc/tracer.c
index 58f4ec1d72c..e514084b24b 100644
--- a/gcc/tracer.c
+++ b/gcc/tracer.c
@@ -154,10 +154,9 @@ find_best_successor (basic_block bb)
FOR_EACH_EDGE (e, ei, bb->succs)
if (!best || better_p (e, best))
best = e;
- if (!best || ignore_bb_p (best->dest))
+ if (!best || !best->probability.initialized_p () || ignore_bb_p
(best->dest))
return NULL;
- if (best->probability.initialized_p ()
- && best->probability.to_reg_br_prob_base () <= probability_cutoff)
+ if (best->probability.to_reg_br_prob_base () <= probability_cutoff)
return NULL;
return best;
}
@@ -174,10 +173,11 @@ find_best_predecessor (basic_block bb)
FOR_EACH_EDGE (e, ei, bb->preds)
if (!best || better_p (e, best))
best = e;
- if (!best || ignore_bb_p (best->src))
+ if (!best || !best->count ().initialized_p () || ignore_bb_p (best->src))
return NULL;
- if (EDGE_FREQUENCY (best) * REG_BR_PROB_BASE
- < bb->count.to_frequency (cfun) * branch_ratio_cutoff)
+ if (bb->count.initialized_p ()
+ && (best->count ().to_frequency (cfun) * REG_BR_PROB_BASE
+ < bb->count.to_frequency (cfun) * branch_ratio_cutoff))
return NULL;
return best;
}
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Subject: [Bug target/85993] config/sh/sh.c:10878: suspicious if .. else chain
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David Binderman <dcb314 at hotmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |amylaar at gcc dot gnu.org
--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
svn blame says
64248 amylaar else if (scratch0 != scratch1)
64248 amylaar {
64248 amylaar emit_move_insn (scratch1, GEN_INT (vcall_offset));
64248 amylaar emit_insn (gen_add2_insn (scratch0, scratch1));
64248 amylaar offset_addr = scratch0;
64248 amylaar }
Adding amylaar
>From gcc-bugs-return-606029-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 08:21:00 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85994] New: Comparison failure in 64-bit libgcc *_{sav,res}ms64*.o on Solaris/x86
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85994
Bug ID: 85994
Summary: Comparison failure in 64-bit libgcc *_{sav,res}ms64*.o
on Solaris/x86
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
CC: daniel.santos at pobox dot com, jakub at gcc dot gnu.org
Target Milestone: ---
Target: i?86-pc-solaris2.*, amd64-pc-solaris2.*
It has been brought to my attention that there are comparion failures in the
64-bit libgcc on Solaris/x86 when using gas:
i386-pc-solaris2.11/amd64/libgcc/avx_savms64f.o differs
i386-pc-solaris2.11/amd64/libgcc/sse_resms64.o differs
i386-pc-solaris2.11/amd64/libgcc/sse_resms64f_s.o differs
i386-pc-solaris2.11/amd64/libgcc/sse_resms64fx.o differs
i386-pc-solaris2.11/amd64/libgcc/avx_resms64fx_s.o differs
i386-pc-solaris2.11/amd64/libgcc/avx_resms64fx.o differs
i386-pc-solaris2.11/amd64/libgcc/avx_resms64.o differs
i386-pc-solaris2.11/amd64/libgcc/sse_savms64f_s.o differs
i386-pc-solaris2.11/amd64/libgcc/sse_savms64_s.o differs
i386-pc-solaris2.11/amd64/libgcc/sse_savms64f.o differs
i386-pc-solaris2.11/amd64/libgcc/avx_resms64x_s.o differs
i386-pc-solaris2.11/amd64/libgcc/avx_savms64_s.o differs
i386-pc-solaris2.11/amd64/libgcc/sse_resms64x.o differs
i386-pc-solaris2.11/amd64/libgcc/sse_resms64x_s.o differs
i386-pc-solaris2.11/amd64/libgcc/avx_savms64f_s.o differs
i386-pc-solaris2.11/amd64/libgcc/sse_resms64x_s.o differs
i386-pc-solaris2.11/amd64/libgcc/avx_savms64f_s.o differs
i386-pc-solaris2.11/amd64/libgcc/sse_savms64.o differs
i386-pc-solaris2.11/amd64/libgcc/sse_resms64f.o differs
i386-pc-solaris2.11/amd64/libgcc/sse_resms64_s.o differs
i386-pc-solaris2.11/amd64/libgcc/avx_resms64_s.o differs
i386-pc-solaris2.11/amd64/libgcc/avx_resms64f.o differs
i386-pc-solaris2.11/amd64/libgcc/avx_resms64f_s.o differs
i386-pc-solaris2.11/amd64/libgcc/sse_resms64fx_s.o differs
i386-pc-solaris2.11/amd64/libgcc/avx_savms64.o differs
i386-pc-solaris2.11/amd64/libgcc/avx_resms64x.o differs
This happens both on the gcc-8 branch and on mainline.
It turns out that the objects already differ when running the exact same
compilation twice. With readelf --debug-dump, one sees that the difference
lies in two .debug_* sections where temp filenames are embedded in the output:
Contents of section .debug_line:
0000 4d000000 02002b00 00000101 fb0e0d00 M.....+.........
0010 01010101 00000001 0000012f 7661722f .........../var/
0020 746d702f 00006363 76395749 4e632e73 tmp/..ccv9WINc.s
0030 00010000 00000902 00000000 00000000 ................
0040 144c4c4c 4c4c4c4b 022f134b 02010001 .LLLLLLK./.K....
0050 01
Contents of section .debug_str:
0000 2f766172 2f746d70 2f2f6363 76395749 /var/tmp//ccv9WI
0010 4e632e73 002f7661 722f6763 632f7265 Nc.s./var/gcc/re
0020 67726573 73696f6e 2f747275 6e6b2f31 gression/trunk/1
0030 312e342d 6763632d 6761732f 6275696c 1.4-gcc-gas/buil
0040 642f6933 38362d70 632d736f 6c617269 d/i386-pc-solari
0050 73322e31 312f616d 6436342f 6c696267 s2.11/amd64/libg
0060 63630047 4e552041 5320322e 333000 cc.GNU AS 2.30.
This doesn't happen on Linux, though. I found that this is caused because on
Solaris, cpp is invoked with -P to work around an as limitation in early
Solaris 10 versions (cf. config/i386/sol2.h (CPP_SPEC); the comment is
misleading,
though: the limitation is only gone in patch 119961-03, released almost exactly
10 years ago).
With -P (and thus without the # <line> lines in the gas input), gas emits
The Directory Table (offset 0x1b):
1 /var/tmp/
The File Name Table (offset 0x26):
Entry Dir Time Size Name
1 1 0 0 cc3DRYva.s
while without -P, we get
The Directory Table (offset 0x1b):
1 /vol/gcc/src/hg/trunk/local/libgcc/config/i386
The File Name Table (offset 0x4b):
Entry Dir Time Size Name
1 1 0 0 resms64.h
I see several possible fixes:
* Just compile those files with -g0: there's probably no point in gas adding
debug info anyway.
* Restrict the cpp -P workaround to non-gas.
* Autoconf assembler # <line> support and only pass -P to cpp if really needed.
Suggestions?
Rainer
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Subject: [Bug target/85994] Comparison failure in 64-bit libgcc *_{sav,res}ms64*.o on Solaris/x86
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Rainer Orth <ro at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |8.2
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Subject: [Bug rtl-optimization/84206] ICE in get_all_loop_exits, at sel-sched-ir.h:1138
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Last reconfirmed| |2018-05-30
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Subject: [Bug c++/85558] ICE in make_rtl_for_nonlocal_decl when using static member of template class
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--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
See PR59480.
>From gcc-bugs-return-606033-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 09:17:29 2018
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Subject: [Bug c/85995] New: GCC defines __STDC__ and __STDC_VERSION__ even when used with options that break C conformance
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Bug ID: 85995
Summary: GCC defines __STDC__ and __STDC_VERSION__ even when
used with options that break C conformance
Product: gcc
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Target Milestone: ---
According to "gcc -dM -E -xc /dev/null" with some additional options, GCC
currently defines __STDC__ and __STDC_VERSION__ even when used with options
that break C conformance, such as -fexcess-precision=fast (which is the
default).
Since these options are known to break C conformance on purpose, __STDC__ and
__STDC_VERSION__ should not be defined in such cases.
>From gcc-bugs-return-606034-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 09:35:58 2018
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From: "sandor.zsuga at jubatian dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85805] Improper code generation for 64 bit comparisons on avr-gcc
Date: Wed, 30 May 2018 09:35:00 -0000
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--- Comment #5 from Sandor Zsuga <sandor.zsuga at jubatian dot com> ---
I received a test report with avr-gcc 8.1.0 , -O2 optimization level: The
behavior is present ( https://www.avrfreaks.net/comment/2477081#comment-2477081
).
>From gcc-bugs-return-606035-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 09:47:21 2018
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From: "jg at jguk dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85958] Make const qualifier error clear
Date: Wed, 30 May 2018 09:47:00 -0000
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--- Comment #3 from Jonny Grant <jg at jguk dot org> ---
(In reply to Jonathan Wakely from comment #2)
> (In reply to Jonny Grant from comment #1)
> > My idea of what would be clearest is :-
> >
> > Cannot pass ‘const int‘ as ‘int&‘ (non const)
>
> I don't think that's an improvement at all.
>
> But "... discards const qualifier" or "... discards volatile qualifier" or
> "...discards const and volatile qualifiers" might be OK. Or saying "as
> reference of non-const type 'int&'" similar to my proposed fix for PR 53281.
Sounds good. I support this improvement!
>From gcc-bugs-return-606036-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 10:53:09 2018
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Subject: [Bug tree-optimization/85971] Really Simple "If" with one function call inside is not optimized efficiently
Date: Wed, 30 May 2018 10:53:00 -0000
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> I think this is actually two different bugs.
> One where cstore is not working when there is a function call inbetween.
> If I add an argument to CreateChecksum and change the first PolyMod to + t
> and the second PolyMod to * t. the cstore optimization work. This is
> recorded now as PR 85987.
>
> The second one is the lowering of common function calls with slightly
> different arguments. I thought I saw one asking for this one but I can't
> find it.
Related would be transforming
if (x)
foo (a,b,c);
else
bar (a,b,c);
to
fn = x ? foo : bar;
(*fn) (a,b,c);
(or the reverse?) which might be profitable when optimizing for size
or even when optimizing branch predictor vs. indirect branch/call
predictor usage.
>From gcc-bugs-return-606037-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 10:55:44 2018
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Subject: [Bug middle-end/85974] Failure to optimize difference of two pointers into a compile time constant
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-30
CC| |rguenth at gcc dot gnu.org
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-606038-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 10:57:01 2018
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Subject: [Bug c++/85976] [8/9 Regression] ICE in cp_tree_equal when building Blitz. May be nested templates.
Date: Wed, 30 May 2018 10:57:00 -0000
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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|--- |8.2
Summary|ICE in cp_tree_equal when |[8/9 Regression] ICE in
|building Blitz. May be |cp_tree_equal when building
|nested templates. |Blitz. May be nested
| |templates.
>From gcc-bugs-return-606039-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 11:00:02 2018
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Subject: [Bug middle-end/85980] suboptimal code for strncmp for powerpc64
Date: Wed, 30 May 2018 11:00:00 -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 #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
But doesn't it eventually improve a size dispatch in the library implementation
by providing a lower value for n?
>From gcc-bugs-return-606040-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 11:01:34 2018
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Subject: [Bug target/85984] [8/9 Regression] ICE in create_pseudo_cfg, at dwarf2cfi.c:2874
Date: Wed, 30 May 2018 11:01:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Target Milestone|--- |8.2
Summary|ICE in create_pseudo_cfg, |[8/9 Regression] ICE in
|at dwarf2cfi.c:2874 |create_pseudo_cfg, at
| |dwarf2cfi.c:2874
>From gcc-bugs-return-606042-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 11:22:45 2018
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From: "jean-michel.beuken at uclouvain dot be" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85996] New: f951: internal compiler error: gfc_trans_select(): Bad type for case expr.
Date: Wed, 30 May 2018 11:22:00 -0000
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Bug ID: 85996
Summary: f951: internal compiler error: gfc_trans_select(): Bad
type for case expr.
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Created attachment 44210
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44210&action=edit
source (http://nn-online.org/code/strings/strings-1.3.tar.gz)
Linux kernel 3.10 CentOS 7.4
gfortran --version
GNU Fortran (GCC) 8.1.0
tar xzf strings-1.3.tar.gz
cd strings-1.3
gfortran -Wall -Wextra -c m_strings.F95
f951: internal compiler error: gfc_trans_select(): Bad type for case expr.
0x60128f gfc_internal_error(char const*, ...)
../../gcc-8.1.0/gcc/fortran/error.c:1358
0x70fe59 gfc_trans_select(gfc_code*)
../../gcc-8.1.0/gcc/fortran/trans-stmt.c:3346
0x6a2ef7 trans_code
../../gcc-8.1.0/gcc/fortran/trans.c:1940
0x6c92cb gfc_generate_function_code(gfc_namespace*)
../../gcc-8.1.0/gcc/fortran/trans-decl.c:6507
0x6a6879 gfc_generate_module_code(gfc_namespace*)
../../gcc-8.1.0/gcc/fortran/trans.c:2222
0x659f4b translate_all_program_units
../../gcc-8.1.0/gcc/fortran/parse.c:6108
0x659f4b gfc_parse_file()
../../gcc-8.1.0/gcc/fortran/parse.c:6324
0x6a02ef gfc_be_parse_file
../../gcc-8.1.0/gcc/fortran/f95-lang.c:204
REM : well compiled with GCC 6.4.0 and 7.1.2
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Subject: [Bug middle-end/85992] Invalid optimization with atanf
Date: Wed, 30 May 2018 11:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85992
Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
You get the runtime value computed by libm when not optimizing and the mpfr
result when GCC applies constant folding.
Iff then this is a libm bug not providing an exact result - but this is
expected as you are dealing with FP.
>From gcc-bugs-return-606044-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 11:26:30 2018
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From: "kari.nurmela at iki dot fi" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/85997] New: Bogus -Wvla warning from function array argument with size expression
Date: Wed, 30 May 2018 11:26:00 -0000
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Bug ID: 85997
Summary: Bogus -Wvla warning from function array argument with
size expression
Product: gcc
Version: 5.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
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If there is an array argument in a function definition or declaration that uses
a size expression (C99 6.7.5.3#7, Example 4, Example 5), gcc emits an "ISO C90
forbids variable length array" warning with -Wvla, even when there are no
variable length arrays involved. For example the function declaration
void print_array(unsigned count, int array[static count]);
gives "not_vla.c:3:1: warning: ISO C90 forbids variable length array "array"
[-Wvla]"
The "array" argument is not a variable-length array, the declaration just
states that the argument provides access to the first element of an array that
has at least "count" elements.
In a whole working example below two warnings are emitted when compiled with
-Wvla (function declaration, line 3, and definition, line 5):
#include <stdio.h>
void print_array(unsigned count, int array[static count]);
void print_array(unsigned count, int array[static count])
{
for (unsigned i = 0; i < count; ++i)
{
printf("%d ", array[i]);
}
printf("\n");
}
int main(void)
{
int array[5] = {1, 2, 3, 4, 5};
print_array(5, array);
// print_array(6, array);
// Error: array overflow. Since 6 and sizeof array are compile time const,
// this could emit a warning, but doesn't.
return 0;
}
>From gcc-bugs-return-606043-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 11:26:29 2018
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Subject: [Bug tree-optimization/85987] cstore does not work with a store in one of the branches
Date: Wed, 30 May 2018 11:26:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Last reconfirmed| |2018-05-30
CC| |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. With recent improvement (r258645) I explicitely preserved that
behavior which is easy to fix for the testcase:
Index: gcc/tree-ssa-phiopt.c
===================================================================
--- gcc/tree-ssa-phiopt.c (revision 260950)
+++ gcc/tree-ssa-phiopt.c (working copy)
@@ -2049,7 +2049,7 @@ single_trailing_store_in_bb (basic_block
return NULL;
/* Verify there is no other store in this BB. */
- if (!SSA_NAME_IS_DEFAULT_DEF (gimple_vuse (store))
+ if (0 && !SSA_NAME_IS_DEFAULT_DEF (gimple_vuse (store))
&& gimple_bb (SSA_NAME_DEF_STMT (gimple_vuse (store))) == bb
&& gimple_code (SSA_NAME_DEF_STMT (gimple_vuse (store))) != GIMPLE_PHI)
return NULL;
Otherwise the code should be able to sink them but the dependence analysis it
performs (when vectorization or if-conversion is enabled, see
max-stores-to-sink param) is too conservative and considering unrelated
dependences (here between
mod and t which alias) for its analysis.
The reason for the heuristic of by default only handling single-store BBs
is that it should be an enabler for if-conversion and if there's a
conditional store remaining that wouldn't work and thus the transform might
not be profitable (it might increase register pressure and cause spilling,
it might need a copy on one of the edges into the store if coalescing
doesn't work, etc. - so it needs a better cost model for that). Originally
the heuristic was there was to be a single _stmt_ in the BB being a store
thus even stricter.
Note this particular patch also breaks things so that the code for
more-than-one-store-in-the-BB is never executed. Consider
int t, mod;
void CreateChecksum(int isTestNet) {
if (isTestNet == 0) {
mod = (5);
t += 1;
} else {
mod = (9);
}
}
which is no longer optimized after the "patch".
>From gcc-bugs-return-606045-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 11:28:41 2018
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Subject: [Bug c/85995] GCC defines __STDC__ and __STDC_VERSION__ even when used with options that break C conformance
Date: Wed, 30 May 2018 11:28:00 -0000
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I guess that would break way more code than the current state (or force people
to use -std=cXX over -std=gnuXX).
>From gcc-bugs-return-606046-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 11:32:10 2018
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Subject: [Bug target/85994] Comparison failure in 64-bit libgcc *_{sav,res}ms64*.o on Solaris/x86
Date: Wed, 30 May 2018 11:32:00 -0000
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Rainer Orth from comment #0)
> I see several possible fixes:
>
> * Just compile those files with -g0: there's probably no point in gas adding
> debug info anyway.
>
> * Restrict the cpp -P workaround to non-gas.
>
> * Autoconf assembler # <line> support and only pass -P to cpp if really
> needed.
>
> Suggestions?
The last two work for me.
> Rainer
>From gcc-bugs-return-606047-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 12:13:39 2018
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Subject: [Bug middle-end/85992] Invalid optimization with atanf
Date: Wed, 30 May 2018 12:13:00 -0000
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--- Comment #2 from Matt Peddie <mpeddie at gmail dot com> ---
Thank you for your quick response. The explanation makes sense, and I agree
this is not a bug. I'd like to understand -- this seems to me to imply that
GCC will use MPFR to evaluate calls to libm functions even when optimizations
are disabled with -O0, since in the -O0 case I still get the MPFR result if I
don't use a separate function and call atanf() on a constant. Is there a way
to disable this behavior?
>From gcc-bugs-return-606048-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 12:20:40 2018
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Subject: [Bug target/85984] [8/9 Regression] ICE in create_pseudo_cfg, at dwarf2cfi.c:2874
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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> ---
Started with r250736 when naked attribute started to be supported on x86_64.
I guess it must have ICEd before on other targets.
>From gcc-bugs-return-606049-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 12:47:47 2018
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Subject: [Bug target/85984] [8/9 Regression] ICE in create_pseudo_cfg, at dwarf2cfi.c:2874
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Guess easiest fix would be to disable hot/cold partitioning in naked functions.
>From gcc-bugs-return-606050-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 13:03:51 2018
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Subject: [Bug gcov-profile/85871] g++.dg/gcov/gcov-8.C random failures
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Maxim Kuvyrkov <mkuvyrkov at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |mkuvyrkov at gcc dot gnu.org
--- Comment #5 from Maxim Kuvyrkov <mkuvyrkov at gcc dot gnu.org> ---
(In reply to Christophe Lyon from comment #0)
> Hi,
>
> It seems g++.dg/gcov/gcov-8.C is failing randomly as one can see by looking
> at reports on https://gcc.gnu.org/ml/gcc-testresults/
...
> FAIL: g++.dg/gcov/gcov-8.C -std=gnu++98 gcov failed: File
> '/home/tcwg-buildslave/workspace/tcwg-buildfarm/tcwg-x86_32-build/snapshots/
> gcc.git~master_rev_e4ddfbc4c1d49271c7c17e574c522a53f9152522/gcc/testsuite/
> g++.dg/gcov/gcov-8.C'
Is this unfortunate copy-paste or does "gcov failed: File ..." part appears on
the same line as "FAIL: g++.dg/gcov/gcov-8.C -std=gnu++98"?
If it is the latter, then the problem is, likely, in testing harness mixing up
file descriptors, and sending 1st line of output to a wrong file. This causes
the failure since pattern for the first line doesn't match.
>From gcc-bugs-return-606051-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 13:16:26 2018
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Subject: [Bug middle-end/85992] Invalid optimization with atanf
Date: Wed, 30 May 2018 13:16:00 -0000
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--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Matt Peddie from comment #2)
> Is there a way to disable this behavior?
-fno-builtin (or a more specific -fno-builtin-atanf) tells gcc to handle atanf
as a regular function call, not as a standard function, so it should avoid
constant folding (I didn't check).
>From gcc-bugs-return-606052-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 13:25:42 2018
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Subject: [Bug target/85994] Comparison failure in 64-bit libgcc *_{sav,res}ms64*.o on Solaris/x86
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Why does this affect only new files, i.e. how did existing libgcc .S files
avoid running into the same issue?
>From gcc-bugs-return-606053-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 13:32:38 2018
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Subject: [Bug gcov-profile/85871] g++.dg/gcov/gcov-8.C random failures
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--- Comment #6 from Christophe Lyon <clyon at gcc dot gnu.org> ---
This is not a typo. A .sum file has a line like this:
apm_64.tcwg-apm_64-build/g++.sum.xz:FAIL: g++.dg/gcov/gcov-8.C -std=gnu++11
gcov failed: File
'/home/tcwg-buildslave/workspace/tcwg-buildfarm/tcwg-apm_64-build/snapshots/gcc.git~master_rev_005097cc192c99442340e8d9cb2c374e879f33d1/gcc/testsuite/g++.dg/gcov/gcov-8.C'
>From gcc-bugs-return-606054-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 13:35:16 2018
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Subject: [Bug target/85994] Comparison failure in 64-bit libgcc *_{sav,res}ms64*.o on Solaris/x86
Date: Wed, 30 May 2018 13:35:00 -0000
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--- Comment #3 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #2 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
> Why does this affect only new files, i.e. how did existing libgcc .S files
> avoid running into the same issue?
Besides the {avx,sse}_{sav,res}ms64*.S files, there are only
config/i386/crti.S
config/i386/crtn.S
config/i386/cygwin.S
config/i386/morestack.S
config/i386/sol2-c1.S
cygwin.S is obviously not relevant to Solaris, neither is morestack.S
(no -fsplit-stack support). crt[in].S and sol2-c1.S are compiled with
$(crt_compile), which uses -g0 from CRTSTUFF_CFLAGS.
The latter observation was why I suggested compiling the *ms64*.S files
with -g0, too.
>From gcc-bugs-return-606055-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 13:36:09 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85994] Comparison failure in 64-bit libgcc *_{sav,res}ms64*.o on Solaris/x86
Date: Wed, 30 May 2018 13:36:00 -0000
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--- Comment #4 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
> (In reply to Rainer Orth from comment #0)
>> I see several possible fixes:
>>
>> * Just compile those files with -g0: there's probably no point in gas adding
>> debug info anyway.
>>
>> * Restrict the cpp -P workaround to non-gas.
>>
>> * Autoconf assembler # <line> support and only pass -P to cpp if really
>> needed.
>>
>> Suggestions?
>
> The last two work for me.
Unless there are other comments, I'll go for the third option.
>From gcc-bugs-return-606056-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 13:43:48 2018
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Subject: [Bug target/85993] config/sh/sh.c:10878: suspicious if .. else chain
Date: Wed, 30 May 2018 13:43:00 -0000
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Jorn Wolfgang Rennecke <amylaar at gcc dot gnu.org> changed:
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CC| |olegendo at gcc dot gnu.org
--- Comment #2 from Jorn Wolfgang Rennecke <amylaar at gcc dot gnu.org> ---
(In reply to David Binderman from comment #0)
> config/sh/sh.c:10878:12: warning: duplicated ‘if’ condition
> [-Wduplicated-cond]
>
> Source code is
>
> else if (scratch0 != scratch1)
> {
> emit_move_insn (scratch1, GEN_INT (vcall_offset));
> emit_insn (gen_add2_insn (scratch0, scratch1));
> offset_addr = scratch0;
> }
>
> but earlier is code
>
> else if (scratch0 != scratch1)
> {
> /* scratch0 != scratch1, and we have indexed loads. Get better
> schedule by loading the offset into r1 and using an indexed
> load - then the load of r1 can issue before the load from
> (this_rtx + delta) finishes. */
> emit_move_insn (scratch1, GEN_INT (vcall_offset));
> offset_addr = gen_rtx_PLUS (Pmode, scratch0, scratch1);
> }
The condition for this block used to be:
else if (! TARGET_SH5 && scratch0 != scratch1)
because the SH5 SHcompact indexed addressing doesn't actually work
the way GCC expects indexed addressing to work.
Thus, the second block (quoted first) is SH5 code.
>From gcc-bugs-return-606057-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 13:43:49 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/85960] -fipa-pta and ifunc are incompatible
Date: Wed, 30 May 2018 13:43:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |wrong-code
CC| |hubicka at gcc dot gnu.org
Version|unknown |8.1.1
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
The issue seems to be that the multiver stuff is
multiver_test/35 (multiver_test) @0x7ff2d74c62e0
Type: function definition analyzed alias
Visibility: externally_visible public
References: resolve_multiver/34 (alias)
Referring:
Availability: overwritable
First run: 0
Function flags:
Called by: main/37 (955630223 (estimated locally),8.09 per call)
Calls:
resolve_multiver/34 (resolve_multiver) @0x7ff2d74c6170
Type: function definition analyzed
Visibility: prevailing_def_ironly
References: multiver_default/33 (addr)
Referring: multiver_test/35 (alias)
Availability: available
First run: 0
Function flags: count: 1073741826 (estimated locally) body nonfreeing_fn
Called by:
Calls:
multiver_default/33 (multiver_default) @0x7ff2d74c6000
Type: function definition analyzed
Visibility: prevailing_def_ironly
Address is taken.
References:
Referring: resolve_multiver/34 (addr)
Availability: available
First run: 0
Function flags: count: 1073741826 (estimated locally) body nonfreeing_fn hot
Called by:
Calls:
so multiver_test is an alias of resolve_multiver which means we get constraints
for resolve_multiver instead of the union of resolve_multiver and
multiver_default.
In IPA PTA we do
/* Build the constraints. */
FOR_EACH_DEFINED_FUNCTION (node)
{
...
node->call_for_symbol_thunks_and_aliases
(associate_varinfo_to_alias, vi, true);
where we "merge" aliases into the DEFINED copy. How we represent ifuncs wrecks
with this it seems. We use the resolve_multiver data for calls to
multiver_test. We probably can add a ifunc attribute lookup but IMHO
the cgraph representation is just bogus. It looks like the multiver_test
cgraph node has ifunc_resolver set to 1(!?) but resolve_multiver doesn't.
/* Set when symbol is an IFUNC resolver. */
unsigned ifunc_resolver : 1;
I expected resolve_multiver to be the IFUNC resolver.
So without actually understanding this mess the following "fixes" the issue:
Index: gcc/tree-ssa-structalias.c
===================================================================
--- gcc/tree-ssa-structalias.c (revision 260950)
+++ gcc/tree-ssa-structalias.c (working copy)
@@ -7713,7 +7713,8 @@ associate_varinfo_to_alias (struct cgrap
if ((node->alias
|| (node->thunk.thunk_p
&& ! node->global.inlined_to))
- && node->analyzed)
+ && node->analyzed
+ && !node->ifunc_resolver)
insert_vi_for_tree (node->decl, (varinfo_t)data);
return false;
}
My point is that multiver_test doesn't call resolve_multiver but it calls
one of the functions returned by the resolver.
So - a different fix from the above would handle this at the point
we generate constraints for the call to multiver_test and emit constraints
for fn = resolve_multiver (); (*fn) (args...). That looks needed because
if you make multiver_test static the constraints still look wrong. We still
need to avoid associating one decl with the other like above.
And we need to get the clobbers on the ifunc call correct...
Half-way patch where the points-to sets look good but the clobbers/uses are
still broken:
Index: gcc/tree-ssa-structalias.c
===================================================================
--- gcc/tree-ssa-structalias.c (revision 260950)
+++ gcc/tree-ssa-structalias.c (working copy)
@@ -3903,7 +3903,7 @@ get_function_part_constraint (varinfo_t
c.offset = 0;
c.type = SCALAR;
}
- else if (TREE_CODE (fi->decl) == FUNCTION_DECL)
+ else if (fi->decl && TREE_CODE (fi->decl) == FUNCTION_DECL)
{
varinfo_t ai = first_vi_for_offset (fi, part);
if (ai)
@@ -4732,6 +4732,30 @@ find_func_aliases_for_call (struct funct
return;
fi = get_fi_for_callee (t);
+ /* First process an ifunc resolver if we run into one. */
+ if (fndecl)
+ {
+ cgraph_node *node = cgraph_node::get (fndecl);
+ if (node->ifunc_resolver)
+ {
+ fi = get_vi_for_tree (node->get_alias_target ()->decl);
+ if (fi->is_fn_info)
+ {
+ constraint_expr rhs
+ = get_function_part_constraint (fi, fi_result);
+ fi = new_var_info (NULL_TREE, "ifuncres", true);
+ fi->is_reg_var = true;
+ constraint_expr lhs;
+ lhs.type = SCALAR;
+ lhs.var = fi->id;
+ lhs.offset = 0;
+ process_constraint (new_constraint (lhs, rhs));
+ }
+ else
+ fi = get_varinfo (anything_id);
+ fndecl = NULL_TREE;
+ }
if (!in_ipa_mode
|| (fndecl && !fi->is_fn_info))
{
@@ -7713,7 +7737,8 @@ associate_varinfo_to_alias (struct cgrap
if ((node->alias
|| (node->thunk.thunk_p
&& ! node->global.inlined_to))
- && node->analyzed)
+ && node->analyzed
+ && !node->ifunc_resolver)
insert_vi_for_tree (node->decl, (varinfo_t)data);
return false;
}
>From gcc-bugs-return-606058-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 13:49:18 2018
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--- Comment #4 from Matt Peddie <mpeddie at gmail dot com> ---
-fno-builtin-atanf does the trick. Thanks, Marc.
>From gcc-bugs-return-606059-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 14:16:21 2018
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Subject: [Bug ipa/85960] -fipa-pta and ifunc are incompatible
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Assignee|marxin at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 44211
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44211&action=edit
patch
I am testing the following complete patch.
>From gcc-bugs-return-606060-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 14:18:11 2018
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Subject: [Bug target/85984] [8/9 Regression] ICE in create_pseudo_cfg, at dwarf2cfi.c:2874
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-05-30
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 44212
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gcc9-pr85984.patch
Untested fix.
>From gcc-bugs-return-606061-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 14:28:15 2018
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--- Comment #6 from David Binderman <dcb314 at hotmail dot com> ---
Nearly three weeks later, any progress ?
>From gcc-bugs-return-606062-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 14:32:14 2018
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Subject: [Bug middle-end/85989] Incorrect result for example involving unary minus in a loop
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. It is backprop somehow concluding that the load is never negative:
--- t.i.093t.ccp2 2018-05-30 16:28:48.811740654 +0200
+++ t.i.096t.backprop 2018-05-30 16:28:48.811740654 +0200
@@ -59,13 +59,12 @@
<bb 5> [local count: 286363364]:
_3 = *P5_32(D);
_4 = (int) _3;
- P29_36 = -_4;
b_P5_37 = b_P5_20 + 1;
<bb 6> [local count: 322154758]:
# b_P5_20 = PHI <b_P5_37(5), 0(16)>
# P26_22 = PHI <P29_23(5), 10(16)>
- # P29_23 = PHI <P29_36(5), 10(16)>
+ # P29_23 = PHI <_4(5), 10(16)>
if (b_P5_20 <= 7)
goto <bb 5>; [88.89%]
else
>From gcc-bugs-return-606063-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 14:33:23 2018
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Subject: [Bug middle-end/85989] [6/7/8/9 Regression] Incorrect result for example involving unary minus in a loop
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
CC| |rguenth at gcc dot gnu.org
Known to work| |5.5.0
Target Milestone|--- |6.5
Summary|Incorrect result for |[6/7/8/9 Regression]
|example involving unary |Incorrect result for
|minus in a loop |example involving unary
| |minus in a loop
Known to fail| |6.1.0
>From gcc-bugs-return-606064-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 14:40:47 2018
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Subject: [Bug middle-end/85989] [6/7/8/9 Regression] Incorrect result for example involving unary minus in a loop
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
for (b_P5 = 0; b_P5 < 8; b_P5++) {
P26 = P29;
P29 = -(int)*P5;
}
for (b_P5 = 0; b_P5 < 3; b_P5++) {
for (P29 = 0; P29 < 9; P29++) {
i0 = P26;
if (P26 < 0) {
i0 = 0;
so the sign of P29 does matter since it flows backwards into P26 -- possibly
exactly the issue that causes the bug. The PHIs look like
<bb 5> [local count: 286363364]:
_3 = *P5_32(D);
_4 = (int) _3;
P29_36 = -_4;
b_P5_37 = b_P5_20 + 1;
<bb 6> [local count: 322154758]:
# b_P5_20 = PHI <b_P5_37(5), 0(16)>
# P26_22 = PHI <P29_23(5), 10(16)>
# P29_23 = PHI <P29_36(5), 10(16)>
if (b_P5_20 <= 7)
goto <bb 5>; [88.89%]
else
goto <bb 14>; [11.11%]
and you can see that parallel assignment to P29_23 and to P23_22 from P29_23
while backprop seems to evaluate PHIs in isolation, eventually losing
that P26_22 = P29_23 copy? This looks hard to fix btw... process_block
needs to be refactored to process all vars from PHI defs in parallel.
Richard?
>From gcc-bugs-return-606065-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 14:55:43 2018
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Subject: [Bug tree-optimization/85964] [8/9 Regression] compile time hog w/ -O3 -ftracer -fno-guess-branch-probability
Date: Wed, 30 May 2018 14:55:00 -0000
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--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed May 30 14:55:04 2018
New Revision: 260954
URL: https://gcc.gnu.org/viewcvs?rev=260954&root=gcc&view=rev
Log:
2018-05-30 Richard Biener <rguenther@suse.de>
PR tree-optimization/85964
* tracer.c (better_p): Drop initialized count check, we only
call the function with initialized counts now.
(find_best_successor): Do find a best edge if one
has uninitialized count.
(find_best_predecessor): Likewise. Do BB frequency check only
if count is initialized.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/tracer.c
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Subject: [Bug tree-optimization/85964] [8/9 Regression] compile time hog w/ -O3 -ftracer -fno-guess-branch-probability
Date: Wed, 30 May 2018 14:58:00 -0000
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--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
The CFG cleanup hog is gone on trunk now - an artificial testcase triggering it
would need to present us with a large number of independently discoverable
branches like maybe
if (foo)
{
tem = 0;
if (tem)
{ sth }
else
{ sth }
}
... repeat above ...
but eventually a more elaborate CFG is required to make fixing up dominators
iteratively blow up. The above would trigger in the CFG cleanup after the
very first CCP pass then.
Otherwise I'll put the RFC pach on hold because it comes at a cost (or
rather I didn't do any measurements on regular code).
>From gcc-bugs-return-606067-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 15:05:32 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 middle-end/85879] [6/7/8/9 Regression] ICE in expand_debug_locations, at cfgexpand.c:5405
Date: Wed, 30 May 2018 15:05:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |cesar at gcc dot gnu.org,
| |jakub at gcc dot gnu.org,
| |tschwinge at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Can't get any ICEs with similar OpenMP code.
In a checking compiler this ICEs much earlier though:
Error: non-trivial conversion at assignment
integer(kind=4)
integer(kind=4) *
i.4 = *D.3808;
during GIMPLE pass: lower
>From gcc-bugs-return-606068-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 15:08:12 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/51571] No named return value optimization while adding a dummy scope
Date: Wed, 30 May 2018 15:08:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2011-12-15 00:00:00 |2018-5-30
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Comment 3 may be a different issue. Clang elides the copy for the original
report with the dummy scope, but doesn't for comment 3.
extern "C" int puts(const char*);
struct A {
int i;
A(int i) : i(i) { puts("cons"); }
A(A const &) { puts("copy"); }
};
A f(bool b)
{
puts("f(bool)");
if (b) return A(0);
A a(1);
return a;
}
A g()
{
puts("g()");
if (false) { }
A a(1);
return a;
}
A h()
{
puts("h()");
{
A a(0);
return a;
}
}
int main()
{
A a = f(false);
A b = g();
A c = h();
return a.i - b.i + c.i;
}
For this code GCC prints:
f(bool)
cons
copy
g()
cons
h()
cons
copy
But Clang prints:
f(bool)
cons
copy
g()
cons
h()
cons
(Neither result is affected by optimization)
>From gcc-bugs-return-606069-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 15:09:08 2018
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Subject: [Bug c++/85976] [8/9 Regression] ICE in cp_tree_equal when building Blitz. May be nested templates.
Date: Wed, 30 May 2018 15:09:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |needs-reduction
--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
So far I've not been able to reduce this.
>From gcc-bugs-return-606070-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 15:15:58 2018
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From: "sgk at troutmask dot apl.washington.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libfortran/85975] Incorrect size for spread array
Date: Wed, 30 May 2018 15:15:00 -0000
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--- Comment #2 from Paul Thomas <pault at gcc dot gnu.org> ---
(In reply to kargl from comment #1)
> Stephan,
>
> I tried the simply patch suggested in your analysis and
> it does fix the problem. I need to extend the patch to
> fix the m4 files that utilize the macro as the 'b'
> parameter is no longer needed.
>
> I've also Paul to the CC list. He finished and sheparded
> the array descriptor reform into the tree. Paul, does
> Stephan's analysis look correct?
Yes, the logic is impeccable and the patch still better :-)
Thanks for the report and the fix, Stephan.
Steve, can you do the honors with this please? I am still pressed by daytime
work and will be for another two-three weeks.
Paul
--- Comment #3 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Wed, May 30, 2018 at 07:49:02AM +0000, pault at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85975
>
> --- Comment #2 from Paul Thomas <pault at gcc dot gnu.org> ---
> (In reply to kargl from comment #1)
> > Stephan,
> >
> > I tried the simply patch suggested in your analysis and
> > it does fix the problem. I need to extend the patch to
> > fix the m4 files that utilize the macro as the 'b'
> > parameter is no longer needed.
> >
> > I've also Paul to the CC list. He finished and sheparded
> > the array descriptor reform into the tree. Paul, does
> > Stephan's analysis look correct?
>
> Yes, the logic is impeccable and the patch still better :-)
>
> Thanks for the report and the fix, Stephan.
>
> Steve, can you do the honors with this please? I am still pressed by daytime
> work and will be for another two-three weeks.
>
Yes, I'll do the honors in the next day or two.
>From gcc-bugs-return-606071-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 15:22:48 2018
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From: "jeff.science at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85998] New: feature request: support C++17 parallel STL
Date: Wed, 30 May 2018 15:22:00 -0000
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Bug ID: 85998
Summary: feature request: support C++17 parallel STL
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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Priority: P3
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Assignee: unassigned at gcc dot gnu.org
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Target Milestone: ---
I'd like to see GCC evolve
https://gcc.gnu.org/onlinedocs/libstdc++/manual/parallel_mode.html into a
proper implementation of the C++17 parallel STL
(http://en.cppreference.com/w/cpp/algorithm).
Because there is already an OpenMP parallel back-end, I assume this is mostly a
matter of creating the boilerplate to map __gnu_parallel::foo(args) to
std::foo(std::execution::par,args).
>From gcc-bugs-return-606072-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 15:23:42 2018
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Subject: [Bug libstdc++/85998] feature request: support C++17 parallel STL
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|c++ |libstdc++
Severity|normal |enhancement
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Subject: [Bug libstdc++/85998] feature request: support C++17 parallel STL
Date: Wed, 30 May 2018 15:25:00 -0000
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
https://gcc.gnu.org/ml/libstdc++/2017-11/msg00112.html
>From gcc-bugs-return-606074-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 15:27:04 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 rtl-optimization/85925] [7/8/9 Regression] Mis-compilation at -02, masking with 257 goes wrong in combine
Date: Wed, 30 May 2018 15:27:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |segher at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r242946.
This is called when trying to simplify HImode lowpart subreg of
(zero_extract:SI (reg/v:SI 117 [ f ])
(const_int 15 [0xf])
(const_int 0 [0]))
and we return newly from that
(zero_extract:HI (subreg:HI (reg/v:SI 117 [ f ]) 0)
(const_int 15 [0xf])
(const_int 0 [0]))
which looks correct to me, so perhaps just a latent combiner or backend issue?
>From gcc-bugs-return-606075-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 15:44:22 2018
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Subject: [Bug libstdc++/85998] feature request: support C++17 parallel STL
Date: Wed, 30 May 2018 15:44:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jeff Hammond from comment #0)
> I'd like to see GCC evolve
> https://gcc.gnu.org/onlinedocs/libstdc++/manual/parallel_mode.html into a
> proper implementation of the C++17 parallel STL
> (http://en.cppreference.com/w/cpp/algorithm).
No, this is absolutely not going to happen. Importing Intel's PSTL is already
in progress, and a much better solution than trying to rewrite the existing
Parallel Mode (which only implements the C++98 algorithms).
I don't see any point keeping this open as a bug report. It's a missing piece
of C++17 support so is already on our roadmap, we don't need a feature request.
"INVALID" isn't really the right resolution, but it'll have to do.
>From gcc-bugs-return-606076-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 15:59:55 2018
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Subject: [Bug target/83009] gcc.target/aarch64/store_v2vec_lanes.c fails with -mabi=ilp32
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--- Comment #10 from avieira at gcc dot gnu.org ---
Author: avieira
Date: Wed May 30 15:59:14 2018
New Revision: 260957
URL: https://gcc.gnu.org/viewcvs?rev=260957&root=gcc&view=rev
Log:
Reverting r260635
gcc
2018-05-30 Andre Vieira <andre.simoesdiasvieira@arm.com>
2018-05-24 Andre Vieira <andre.simoesdiasvieira@arm.com>
PR target/83009
Revert:
* config/aarch64/predicates.md (aarch64_mem_pair_lanes_operand): Make
address check not strict.
gcc/testsuite
2018-05-30 Andre Vieira <andre.simoesdiasvieira@arm.com>
2018-05-24 Andre Vieira <andre.simoesdiasvieira@arm.com>
Revert
PR target/83009
* gcc/target/aarch64/store_v2vec_lanes.c: Add extra tests.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@260635
138bc75d-0d04-0410-961f-82ee72b054a4
Modified:
trunk/gcc/config/aarch64/predicates.md
trunk/gcc/testsuite/gcc.target/aarch64/store_v2vec_lanes.c
>From gcc-bugs-return-606077-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 16:16:51 2018
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Subject: [Bug rtl-optimization/83962] [6/7 Regression] ICE: verify_flow_info failed (too many outgoing branch edges from bb 8)
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Peter Bergner <bergner at gcc dot gnu.org> changed:
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--- Comment #6 from Peter Bergner <bergner at gcc dot gnu.org> ---
Can we move this to Resolved/Fixed?
>From gcc-bugs-return-606078-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 16:17:33 2018
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Subject: [Bug rtl-optimization/83852] [6/7 Regression] ICE in sel_redirect_edge_and_branch, at sel-sched-ir.c:5644 on 32-bit BE powerpc targets
Date: Wed, 30 May 2018 16:17:00 -0000
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Peter Bergner <bergner at gcc dot gnu.org> changed:
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--- Comment #5 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to Andrey Belevantsev from comment #2)
> This is fixed by the patch for PR83962. I will close this PR after adding
> the testcase.
Can we close this now?
>From gcc-bugs-return-606079-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 16:18:51 2018
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Subject: [Bug rtl-optimization/83962] [6/7 Regression] ICE: verify_flow_info failed (too many outgoing branch edges from bb 8)
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
It hasn't been backported to 7.x/6.x, so no, unless we decide not to backport
it there.
>From gcc-bugs-return-606080-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 16:29:25 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/85956] [8/9 Regression] ICE in wide_int_to_tree_1, at tree.c:1549
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |msebor at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Note even without -fopenmp this prints:
pr85956.c:7:10: warning: array subscript -1 is below array bounds of
‘int[<Ucf30> + 1]’ [-Warray-bounds]
a[-1][-1] = 42;
~~~~~^~~~
which is not what we want - the <Ucf30> in there at least...
>From gcc-bugs-return-606081-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 16:43:37 2018
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Subject: [Bug tree-optimization/85999] New: 416.gamess slowed down by BB vectorization
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Bug ID: 85999
Summary: 416.gamess slowed down by BB vectorization
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
Target Milestone: ---
Adding -ftree-slp-vectorize to -O2 -march=haswell [-mprefer-avx128] on
416.gamess
slows down the benchmark significantly. Adding -fno-tree-slp-vectorize to
-Ofast -march=haswell speeds it up.
Thus somehow BB vectorization slows down 416.gamess.
>From gcc-bugs-return-606082-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 17:33:46 2018
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Subject: [Bug c++/85873] [8/9 regression] GCC omits array constant in .rodata causing a segmentation fault.
Date: Wed, 30 May 2018 17:33:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85873
--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Wed May 30 17:33:06 2018
New Revision: 260969
URL: https://gcc.gnu.org/viewcvs?rev=260969&root=gcc&view=rev
Log:
PR c++/85873 - constant initializer_list array not in .rodata.
* tree.c (build_target_expr): Set TREE_READONLY.
* call.c (set_up_extended_ref_temp): Set TREE_READONLY.
Added:
trunk/gcc/testsuite/g++.dg/tree-ssa/array-temp1.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/call.c
trunk/gcc/cp/tree.c
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Subject: [Bug c++/86000] New: ICE with requires statement in a non constexpr if
Date: Wed, 30 May 2018 17:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86000
Bug ID: 86000
Summary: ICE with requires statement in a non constexpr if
Product: gcc
Version: 8.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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Created attachment 44213
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44213&action=edit
Preprocessed source with command-line options
// This code when compiled with -fconcepts causes an ICE. I'm not
// sure if this should even compile. I am expecting that the requires
// clause will return true since "3 > 4;" is well-formed. When compiled
// with -std=c++17 then if constexpr(requires { 3 > 4; }) does compile and
// the function returns 1.
template <typename T>
int f()
{
if (requires { 3 > 4; }) return 1;
else return 2;
}
int main()
{
return f<int>();
}
>From gcc-bugs-return-606084-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 17:58:49 2018
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From: "xavierb at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86001] New: explicit default constructor not allowed in anonymous aggregate
Date: Wed, 30 May 2018 17:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86001
Bug ID: 86001
Summary: explicit default constructor not allowed in anonymous
aggregate
Product: gcc
Version: unknown
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Priority: P3
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Assignee: unassigned at gcc dot gnu.org
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Hello,
In this example:
union Union {
int val;
Union() = default;
Union(int _v) : val(_v) {}
};
struct StructA {
Union u;
};
struct StructB {
struct {
Union u;
} s;
};
struct StructC {
struct {
Union u;
};
};
GCC (6,7,8 and 9) accept StructA and StructB.
but not StructC:
error: member 'Union StructC::<unnamed struct>::u' with constructor not
allowed in anonymous aggregate
Maybe it's not valid c++ for some reason? But it compiles fine with clang,
msvc, icc.
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Subject: [Bug middle-end/85956] [8/9 Regression] ICE in wide_int_to_tree_1, at tree.c:1549
Date: Wed, 30 May 2018 18:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85956
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
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Subject: [Bug c++/86002] New: ICE with requires in constexpr if condition
Date: Wed, 30 May 2018 18:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86002
Bug ID: 86002
Summary: ICE with requires in constexpr if condition
Product: gcc
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Pre-processed source and command-line options
// ICE when using requires to detect welll-formedness of code using constexpr
if
struct X {};
struct Y { int i; };
template <typename T>
int f(T t)
{
if constexpr (requires { t.i; })
return t.i;
else
return {};
}
int main()
{
return f(X{}) + f(Y{});
}
>From gcc-bugs-return-606087-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 18:47:02 2018
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From: "stilor at att dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug driver/86003] New: [8 Regression] GCC fails to build when configured --with-cpu=xscale
Date: Wed, 30 May 2018 18:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86003
Bug ID: 86003
Summary: [8 Regression] GCC fails to build when configured
--with-cpu=xscale
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
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Created attachment 44215
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Script to reproduce the issue
I am seeing the following failure when building a crosstool-NG configuration
which configures GCC for XScale CPU. The warning is:
cc1: warning: switch -mcpu=xscale conflicts with -march=armv5te switch
But during the build of libatomic, -Werror is thrown in, so the warning becomes
an error. The failing command is:
libtool: compile:
/home/avn/work/ctng/crosstool-ng/.build/armeb-unknown-linux-uclibcgnueabi/build/build-cc-gcc-final/./gcc/xgcc
-B/home/avn/work/ctng/crosstool-ng/.build/armeb-unknown-linux-uclibcgnueabi/build/build-cc-gcc-final/./gcc/
-B/home/avn/x-tools/armeb-unknown-linux-uclibcgnueabi/armeb-unknown-linux-uclibcgnueabi/bin/
-B/home/avn/x-tools/armeb-unknown-linux-uclibcgnueabi/armeb-unknown-linux-uclibcgnueabi/lib/
-isystem
/home/avn/x-tools/armeb-unknown-linux-uclibcgnueabi/armeb-unknown-linux-uclibcgnueabi/include
-isystem
/home/avn/x-tools/armeb-unknown-linux-uclibcgnueabi/armeb-unknown-linux-uclibcgnueabi/sys-include
-DHAVE_CONFIG_H
-I/home/avn/work/ctng/crosstool-ng/.build/armeb-unknown-linux-uclibcgnueabi/src/gcc/libatomic/config/arm
-I/home/avn/work/ctng/crosstool-ng/.build/armeb-unknown-linux-uclibcgnueabi/src/gcc/libatomic/config/linux/arm
-I/home/avn/work/ctng/crosstool-ng/.build/armeb-unknown-linux-uclibcgnueabi/src/gcc/libatomic/config/posix
-I/home/avn/work/ctng/crosstool-ng/.build/armeb-unknown-linux-uclibcgnueabi/src/gcc/libatomic
-I. -Wall -Werror -pthread -g -O2 -g -Os -MT init.lo -MD -MP -MF .deps/init.Tpo
-c
/home/avn/work/ctng/crosstool-ng/.build/armeb-unknown-linux-uclibcgnueabi/src/gcc/libatomic/config/linux/arm/init.c
-fPIC -DPIC -o .libs/init.o
A reproduction script (including the configuration for GCC and all the
prerequisites) is attached; for the sake of reducing the build time, it just
builds the GCC and runs the compiler on an empty source file.
The problem, as far as I can see, is that the driver executes cc1 with the
flags defined in
#define OPTION_DEFAULT_SPECS \
{"arch", "%{!march=*:%{!mcpu=*:-march=%(VALUE)}}" }, \
{"cpu", "%{!march=*:%{!mcpu=*:-mcpu=%(VALUE)}}" }, \
{"tune", "%{!mcpu=*:%{!mtune=*:-mtune=%(VALUE)}}" }, \
{"float", "%{!mfloat-abi=*:-mfloat-abi=%(VALUE)}" }, \
{"fpu", "%{!mfpu=*:-mfpu=%(VALUE)}"}, \
{"abi", "%{!mabi=*:-mabi=%(VALUE)}"}, \
{"mode", "%{!marm:%{!mthumb:-m%(VALUE)}}"}, \
{"tls", "%{!mtls-dialect=*:-mtls-dialect=%(VALUE)}"},
Which evaluates to:
-mcpu=xscale -mfloat-abi=soft -mtls-dialect=gnu -marm -march=armv5te
added to the arguments from the command line (there were no -march= or -mcpu=
specified explicitly in the failing command).
Then, cc1 discovers that -mcpu=xscale and -march=armv5te are not exactly
compatible:
(gdb) p arm_selected_cpu->common.isa_bits
$17 = {isa_bit_armv3m, isa_bit_mode32, isa_bit_notm, isa_bit_xscale,
isa_bit_armv4, isa_bit_armv5e, isa_bit_armv5, isa_bit_thumb, isa_nobit <repeats
36 times>}
(gdb) p arm_selected_arch->common.isa_bits
$18 = {isa_bit_armv3m, isa_bit_mode32, isa_bit_notm, isa_bit_armv4,
isa_bit_armv5e, isa_bit_armv5, isa_bit_thumb, isa_nobit <repeats 37 times>}
Because they differ in the presence of isa_bit_xscale (and that bit is not
listed as a quirk that's ignored during comparison), cc1 complains.
Received the following response on the mailing list [1]:
> OK, got it. Xscale isn't really an architecture in its own right, so
> having an architectural bit for is is somewhat of an anomaly. Given
> that this is only used to cause some pre-defines to occur, perhaps the
> simplest thing to do is to convert the architecture bit into a tuning
> flag. That will then avoid the conflicting state.
>
> Could you raise a bugzilla ticket please and mark it as a regression.
[1] https://gcc.gnu.org/ml/gcc-help/2018-05/msg00172.html
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Subject: [Bug libstdc++/85998] feature request: support C++17 parallel STL
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85998
--- Comment #3 from Jeff Hammond <jeff.science at gmail dot com> ---
Other projects use the existence of feature requests in their bug tracker for
prioritization of development. How does GCC manage this information? How do
you track GCC roadmap development if not through this system? Where can I
follow progress towards C++17 parallel STL?
I am well aware of the Intel PSTL work.
>From gcc-bugs-return-606089-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 19:01:44 2018
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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++/85977] Incorrect handling of array reference size deduction
Date: Wed, 30 May 2018 19:01:00 -0000
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Seems like deducing the template parameter N fails because of the type
mismatch; parm is long int (element type of the array), while arg is int
(element type of {1, 2, 3}):
21789 /* We have already checked cv-qualification at the top of the
21790 function. */
21791 if (!same_type_ignoring_top_level_qualifiers_p (arg, parm))
21792 return unify_type_mismatch (explain_p, parm, arg);
I guess here's where [over.ics.list]/6 applies so we should try an implicit
conversion sequence from int to long.
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Subject: [Bug libstdc++/85998] feature request: support C++17 parallel STL
Date: Wed, 30 May 2018 19:19:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.0
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jeff Hammond from comment #3)
> Other projects use the existence of feature requests in their bug tracker
> for prioritization of development. How does GCC manage this information?
Finishing C++17 support in libstdc++ is already one of our top priorities for
GCC 9. There's no need to ask for it, and doing so won't affect priorities. The
missing pieces are documented:
https://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2017
> How do you track GCC roadmap development if not through this system?
However different developers want to. People work on what they (or their
employers or sponsors) want to work on. Personally I don't see any point in
having open bugs to track that features are missing when they're already
documented as missing. We know they're missing.
If it makes you feel better this can be reopened, and then ignored until the
missing features are done, then closed as FIXED. I don't see any advantage to
that though.
> Where
> can I follow progress towards C++17 parallel STL?
On the libstdc++ mailing list, and (especially during the initial stages of the
integration) in the PSTL upstream.
> I am well aware of the Intel PSTL work.
So then you might have seen the pull requests being created to prepare it for
inclusion in libstdc++ and libc++.
>From gcc-bugs-return-606091-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 19:28:27 2018
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From: "tavianator at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85958] Make const qualifier error clear
Date: Wed, 30 May 2018 19:28:00 -0000
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Tavian Barnes <tavianator at gmail dot com> changed:
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CC| |tavianator at gmail dot com
--- Comment #4 from Tavian Barnes <tavianator at gmail dot com> ---
IMHO "discards qualifiers" and even "discards const qualifier" are still
confusing. Making it clearly counterfactual, as in "...would discard (const)
qualifier(s)...," would be an improvement.
But I'd further argue that "discarding qualifiers" is not really how most
people think of this kind of error. When a minor tries to get into a bar, they
are not told that "entering this bar discards your age," they are told that
"minors aren't allowed." So I think "cannot bind 'const int' to non-const
reference type 'int&'" would be more intuitive phrasing.
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Subject: [Bug tree-optimization/81401] False positive sprintf warning at O2 (-Wformat-overflow)
Date: Wed, 30 May 2018 19:31:00 -0000
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Paul Eggert <eggert at gnu dot org> changed:
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CC| |eggert at gnu dot org
--- Comment #3 from Paul Eggert <eggert at gnu dot org> ---
Created attachment 44216
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44216&action=edit
Extract from Emacs source code illustrating the bug
I see this bug's symptoms when compiling Emacs with gcc (GCC) 8.1.1 20180502
(Red Hat 8.1.1-1) on x86-64. I narrowed it down to the attached source file
x.i. When I compile it with:
gcc -S -Wformat-overflow=1 -O2 x.i
I get the following diagnostic, which is a false alarm as the sprintf call
cannot overflow because the value is obviously in the range 0..0x3FFFFF.
x.i: In function ‘x_draw_glyphless_glyph_string_foreground’:
x.i:29:22: warning: ‘__builtin___sprintf_chk’ may write a terminating nul past
the end of the destination [-Wformat-overflow=]
sprintf (buf, "%0*X", ch < 0x10000 ? 4 : 6, ch);
^
x.i:9:10: note: ‘__builtin___sprintf_chk’ output between 5 and 8 bytes into a
destination of size 7
return __builtin___sprintf_chk (s, 1,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
__builtin_object_size (s, 1), fmt,
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
__builtin_va_arg_pack ());
~~~~~~~~~~~~~~~~~~~~~~~~~
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From: "rearnsha at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/86003] [8/9 Regression] GCC fails to build when configured --with-cpu=xscale
Date: Wed, 30 May 2018 19:32:00 -0000
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Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-30
Summary|[8 Regression] GCC fails to |[8/9 Regression] GCC fails
|build when configured |to build when configured
|--with-cpu=xscale |--with-cpu=xscale
Ever confirmed|0 |1
--- Comment #1 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Confirmed. Fix in testing.
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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85807] [8/9 Regression] ICEs related to noexcept
Date: Wed, 30 May 2018 19:32:00 -0000
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--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Wed May 30 19:31:11 2018
New Revision: 260972
URL: https://gcc.gnu.org/viewcvs?rev=260972&root=gcc&view=rev
Log:
PR c++/85807 - ICE with call in template NSDMI.
* init.c (get_nsdmi): Use push_to/pop_from_top_level.
* tree.c (bot_manip): Don't set_flags_from_callee in a template.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/nsdmi-template17.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/init.c
trunk/gcc/cp/tree.c
trunk/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-ice14.C
trunk/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-nsdmi8.C
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Subject: [Bug tree-optimization/53947] [meta-bug] vectorizer missed-optimizations
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Bug 53947 depends on bug 85920, which changed state.
Bug 85920 Summary: Incomplete transition to IFNs for scatter/gather support, drop vectorize.builtin_{gather,scatter} target hooks
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85920
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
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Subject: [Bug target/85920] Incomplete transition to IFNs for scatter/gather support, drop vectorize.builtin_{gather,scatter} target hooks
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rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Dup of 85919 (bugzilla gateway timeout?)
*** This bug has been marked as a duplicate of bug 85919 ***
>From gcc-bugs-return-606096-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 19:34:18 2018
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From: "rsandifo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85919] New: Incomplete transition to IFNs for scatter/gather support, drop vectorize.builtin_{gather,scatter} target hooks
Date: Wed, 30 May 2018 19:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85919
Bug ID: 85919
Summary: Incomplete transition to IFNs for scatter/gather
support, drop vectorize.builtin_{gather,scatter}
target hooks
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
CC: rsandifo at gcc dot gnu.org
Blocks: 53947
Target Milestone: ---
Target: x86_64-*-*, i?86-*-*
When IFNs were introduced for scatter/gather and SVE the x86 backend wasn't
transitioned to them. We should do that transition and remove the then
unneeded target hooks for the legacy support.
--- Comment #1 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
*** Bug 85920 has been marked as a duplicate of this bug. ***
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations
>From gcc-bugs-return-606098-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 19:42:26 2018
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From: "jeff.science at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/85998] feature request: support C++17 parallel STL
Date: Wed, 30 May 2018 19:42:00 -0000
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--- Comment #5 from Jeff Hammond <jeff.science at gmail dot com> ---
> Finishing C++17 support in libstdc++ is already one of our top priorities for
> GCC 9. There's no need to ask for it, and doing so won't affect priorities.
> The missing pieces are documented:
> https://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2017
That page says nothing about priority of parallel STL or the GCC 9 roadmap.
For "The Parallelism TS Should be Standardized" it says Status=No.
Given the lack of support for C11 threads in glibc
(https://sourceware.org/bugzilla/show_bug.cgi?id=14092), I do not think it is
unreasonable to be pessimistic about support for parallel features in the GNU
toolchain.
> However different developers want to. People work on what they (or their
> employers or sponsors) want to work on. Personally I don't see any point in
> having open bugs to track that features are missing when they're already
> documented as missing. We know they're missing.
*You* know they are missing. Do you expect every GCC user to subscribe to
every GCC mailing list to track development? Have you ever thought about what
it is like to be a user of GCC, as opposed to a developer?
> If it makes you feel better this can be reopened, and then ignored until the
> missing features are done, then closed as FIXED. I don't see any advantage to
> that though.
Please do this. That way, GCC users who assume the bug tracker is used to
track development can find it.
> On the libstdc++ mailing list, and (especially during the initial stages of
> the integration) in the PSTL upstream.
I'm sure I'm wasting my time in suggesting that email is not a good project
management system.
> So then you might have seen the pull requests being created to prepare it for
> inclusion in libstdc++ and libc++.
I assume you mean https://github.com/intel/parallelstl/pull/9. I wasn't
watching the GitHub project but am now.
I would have expected to see a pull request against GCC rather than PSTL, but
clearly, GCC has a unique approach to project management.
>From gcc-bugs-return-606099-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 19:52:03 2018
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Subject: [Bug c++/77513] -Wzero-as-null-pointer-constant vs 0, nullptr, NULL and __null
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Ville Voutilainen <ville.voutilainen at gmail dot com> changed:
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----------------------------------------------------------------------------
CC| |ville.voutilainen at gmail dot com
--- Comment #7 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
"The macro NULL is an implementation-defined null pointer constant.", says the
C++ standard draft.
>From gcc-bugs-return-606100-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 20:01:25 2018
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Subject: [Bug c++/77513] -Wzero-as-null-pointer-constant vs 0, nullptr, NULL and __null
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--- Comment #8 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
See r260973
>From gcc-bugs-return-606101-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 20:12:42 2018
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From: "slayoo at staszic dot waw.pl" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85976] [8/9 Regression] ICE in cp_tree_equal when building Blitz. May be nested templates.
Date: Wed, 30 May 2018 20:12:00 -0000
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--- Comment #6 from Sylwester Arabas <slayoo at staszic dot waw.pl> ---
BTW, according to this gcc www entry, Blitz++ seems to listed as a part of GCC
test suite: https://gcc.gnu.org/testing/testing-blitz.html
Is this information up to date?
Was this issue somehow triggered in automatic tests?
>From gcc-bugs-return-606102-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 20:16:25 2018
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From: "rsandifo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/85989] [6/7/8/9 Regression] Incorrect result for example involving unary minus in a loop
Date: Wed, 30 May 2018 20:15:00 -0000
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rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rsandifo at gcc dot gnu.org
--- Comment #3 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Created attachment 44217
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44217&action=edit
candidate patch
(In reply to Richard Biener from comment #2)
> for (b_P5 = 0; b_P5 < 8; b_P5++) {
> P26 = P29;
> P29 = -(int)*P5;
> }
>
> for (b_P5 = 0; b_P5 < 3; b_P5++) {
> for (P29 = 0; P29 < 9; P29++) {
> i0 = P26;
> if (P26 < 0) {
> i0 = 0;
>
> so the sign of P29 does matter since it flows backwards into P26 -- possibly
> exactly the issue that causes the bug. The PHIs look like
>
> <bb 5> [local count: 286363364]:
> _3 = *P5_32(D);
> _4 = (int) _3;
> P29_36 = -_4;
> b_P5_37 = b_P5_20 + 1;
>
> <bb 6> [local count: 322154758]:
> # b_P5_20 = PHI <b_P5_37(5), 0(16)>
> # P26_22 = PHI <P29_23(5), 10(16)>
> # P29_23 = PHI <P29_36(5), 10(16)>
> if (b_P5_20 <= 7)
> goto <bb 5>; [88.89%]
> else
> goto <bb 14>; [11.11%]
>
> and you can see that parallel assignment to P29_23 and to P23_22 from P29_23
> while backprop seems to evaluate PHIs in isolation, eventually losing
> that P26_22 = P29_23 copy?
Yeah.
> This looks hard to fix btw... process_block needs to be refactored
> to process all vars from PHI defs in parallel.
>
> Richard?
Processing them linearly is OK since the first phase sets up an
optimistic result based on a "backward" walk and the second phase
is supposed to find a correct maximal fixed point. The problem
was that we weren't even doing the linear processing properly,
since a reference to a previously-processed PHI was being treated
as a back edge reference to an unprocessed PHI.
The attached fixes the test, but I'll run it through more testing tomorrow.
>From gcc-bugs-return-606103-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 20:21:52 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 libstdc++/85998] feature request: support C++17 parallel STL
Date: Wed, 30 May 2018 20:21:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |NEW
Last reconfirmed| |2018-05-30
Resolution|INVALID |---
Ever confirmed|0 |1
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jeff Hammond from comment #5)
> > Finishing C++17 support in libstdc++ is already one of our top priorities for
> > GCC 9. There's no need to ask for it, and doing so won't affect priorities.
> > The missing pieces are documented:
> > https://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2017
>
> That page says nothing about priority of parallel STL or the GCC 9 roadmap.
There are no priorities to document (and it's the manual, it documents the
current status, so of course there are no priorities there anyway). Work gets
done when it gets done.
We are working to complete C++17 support for GCC 9. It will be complete when
it's complete.
> For "The Parallelism TS Should be Standardized" it says Status=No.
Because that's the status.
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Subject: [Bug middle-end/85956] [8/9 Regression] ICE in wide_int_to_tree_1, at tree.c:1549
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2018-05/msg01763.html
>From gcc-bugs-return-606105-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 20:47:53 2018
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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++/85977] Incorrect handling of array reference size deduction
Date: Wed, 30 May 2018 20:47:00 -0000
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
// PR c++/85977, Incorrect handling of array reference size deduction
// { dg-do compile { target c++11 } }
template <int N>
void fn1 (const char (&)[N]) { static_assert (N == 3, "fn1");}
template <int N>
void fn2 (const short (&)[N]) { static_assert (N == 3, "fn2");}
template <int N>
void fn3 (const int (&)[N]) { static_assert (N == 3, "fn2");}
template <int N>
void fn4 (const long (&)[N]) { static_assert (N == 3, "fn4");}
template <int N>
void fn5 (const unsigned char (&)[N]) { static_assert (N == 3, "fn5");}
template <int N>
void fn6 (const unsigned short (&)[N]) { static_assert (N == 3, "fn6");}
template <int N>
void fn7 (const unsigned int (&)[N]) { static_assert (N == 3, "fn7");}
template <int N>
void fn8 (const unsigned int (&)[N]) { static_assert (N == 3, "fn8");}
void
bar ()
{
fn1 ({1, 2, 3});
fn2 ({1, 2, 3});
fn3 ({1, 2, 3});
fn4 ({1, 2, 3});
fn5 ({1, 2, 3});
fn6 ({1, 2, 3});
fn7 ({1, 2, 3});
fn8 ({1, 2, 3});
}
>From gcc-bugs-return-606106-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 20:50:25 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85977] Incorrect handling of array reference size deduction
Date: Wed, 30 May 2018 20:50:00 -0000
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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 #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
And a patch that seems to work:
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -21398,6 +21398,16 @@ unify (tree tparms, tree targs, tree parm, tree arg,
int strict,
if (!BRACE_ENCLOSED_INITIALIZER_P (elt))
{
+ /* [over.ics.list]/6 says we should try an implicit conversion
+ from each list element to the corresponding array element
+ type. */
+ if (TREE_CODE (parm) == ARRAY_TYPE)
+ {
+ tree x = perform_implicit_conversion (elttype, elt, complain);
+ if (x != error_mark_node)
+ elt = x;
+ }
+
tree type = TREE_TYPE (elt);
if (type == error_mark_node)
return unify_invalid (explain_p);
>From gcc-bugs-return-606107-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 21:01:48 2018
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From: "seurer at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/86004] New: [9 regression] Several lto test cases begin failing with r260963
Date: Wed, 30 May 2018 21:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86004
Bug ID: 86004
Summary: [9 regression] Several lto test cases begin failing
with r260963
Product: gcc
Version: 9.0
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This started with r260963 but that specific revision won't build properly
because of an error in a previous revision. I am not sure if the test cases
just need updating (an option was changed on at least some of them).
I saw this on powerpc64 but it also fails on a check of one of them on x86.
> FAIL: g++.dg/lto/20091002-1 cp_lto_20091002-1_0.o-cp_lto_20091002-1_0.o link, -fPIC -flto -Wno-return-type
> FAIL: g++.dg/lto/pr64043 cp_lto_pr64043_0.o-cp_lto_pr64043_0.o link, -flto -std=c++11
> FAIL: g++.dg/lto/pr65193 cp_lto_pr65193_0.o-cp_lto_pr65193_0.o link, -fPIC -r -nostdlib -flto -O2 -g -Wno-return-type
> FAIL: g++.dg/lto/pr65302 cp_lto_pr65302_0.o-cp_lto_pr65302_1.o link, -flto -O2 -Wno-return-type
> FAIL: g++.dg/lto/pr65316 cp_lto_pr65316_0.o-cp_lto_pr65316_1.o link, -flto -std=c++11 -g2 -fno-lto-odr-type-merging -O2 -Wno-return-type
> FAIL: g++.dg/lto/pr65549 cp_lto_pr65549_0.o-cp_lto_pr65549_0.o link, -std=gnu++14 -flto -g -O2 -fno-inline -flto-partition=max -Wno-return-type
> FAIL: g++.dg/lto/pr65549 cp_lto_pr65549_0.o-cp_lto_pr65549_0.o link, -std=gnu++14 -flto -g -Wno-return-type
> FAIL: g++.dg/lto/pr66180 cp_lto_pr66180_0.o-cp_lto_pr66180_1.o link, -flto -std=c++14 -r -nostdlib
> FAIL: g++.dg/lto/pr66705 cp_lto_pr66705_0.o-cp_lto_pr66705_0.o link, -O2 -flto -flto-partition=max -fipa-pta
> FAIL: g++.dg/lto/pr68057 cp_lto_pr68057_0.o-cp_lto_pr68057_1.o link, -O0 -flto -flto-partition=none -fuse-linker-plugin
> FAIL: g++.dg/lto/pr68057 cp_lto_pr68057_0.o-cp_lto_pr68057_1.o link, -O0 -flto -fuse-linker-plugin -fno-fat-lto-objects
> FAIL: g++.dg/lto/pr68057 cp_lto_pr68057_0.o-cp_lto_pr68057_1.o link, -O2 -flto -flto-partition=none -fuse-linker-plugin -fno-fat-lto-objects
> FAIL: g++.dg/lto/pr68057 cp_lto_pr68057_0.o-cp_lto_pr68057_1.o link, -O2 -flto -fuse-linker-plugin
> FAIL: g++.dg/lto/pr69077 cp_lto_pr69077_0.o-cp_lto_pr69077_1.o link, -O3 -g -flto
> FAIL: g++.dg/lto/pr69133 cp_lto_pr69133_0.o-cp_lto_pr69133_1.o link, -flto -O2
> FAIL: g++.dg/lto/pr69137 cp_lto_pr69137_0.o-cp_lto_pr69137_0.o link, -std=c++11 -g -flto
> FAIL: g++.dg/lto/pr79000 cp_lto_pr79000_0.o-cp_lto_pr79000_1.o link, -flto -g
> FAIL: g++.dg/lto/pr81940 cp_lto_pr81940_0.o-cp_lto_pr81940_0.o link, -O -flto
> FAIL: g++.dg/lto/pr85176 cp_lto_pr85176_0.o-cp_lto_pr85176_0.o link, -flto -g1
> FAIL: gfortran.dg/lto/pr79108 f_lto_pr79108_0.o-f_lto_pr79108_0.o link, -Ofast -flto --param ggc-min-expand=0 --param ggc-min-heapsize=0
>From gcc-bugs-return-606108-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 21:18:48 2018
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From: "asb at lowrisc dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug translation/86005] New: [RISCV] Invalid lowering of atomics for -march=rv32i / -march=rv64i
Date: Wed, 30 May 2018 21:18:00 -0000
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Bug ID: 86005
Summary: [RISCV] Invalid lowering of atomics for -march=rv32i /
-march=rv64i
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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When targeting -march=rv32i or -march=rv64i (i.e. a RISC-V target without the A
extension), GCC will produce a fence-based mapping for atomic load and store
while calling the __atomic_* libcalls for other operations. As documented here
<https://gcc.gnu.org/wiki/Atomic/GCCMM/LIbrary> this is not legal. As stated
there and in the equivalent LLVM documentation
<https://llvm.org/docs/Atomics.html#atomics-and-codegen> lock-based library
calls and lock-free instructions should not be intermixed for the same object.
Below is a representative example, where I believe a call to __atomic_load_4
should be generated.
$ cat foo.c
int atomic(int *i) {
int j = __atomic_add_fetch(i, 1, __ATOMIC_SEQ_CST);
int k;
__atomic_load(i, &k, __ATOMIC_SEQ_CST);
return j+k;
}
$ ./riscv32-unknown-elf-gcc -march=rv32i foo.c -O1 -S -o -
.file "foo.c"
.option nopic
.text
.align 2
.globl atomic
.type atomic, @function
atomic:
addi sp,sp,-16
sw ra,12(sp)
sw s0,8(sp)
mv s0,a0
li a2,5
li a1,1
call __atomic_fetch_add_4
addi a0,a0,1
fence iorw,iorw
lw a5,0(s0)
fence iorw,iorw
add a0,a5,a0
lw ra,12(sp)
lw s0,8(sp)
addi sp,sp,16
jr ra
.size atomic, .-atomic
.ident "GCC: (GNU) 9.0.0 20180530 (experimental)"
>From gcc-bugs-return-606109-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 21:26:34 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 middle-end/85879] [6/7/8/9 Regression] ICE in expand_debug_locations, at cfgexpand.c:5405
Date: Wed, 30 May 2018 21:26:00 -0000
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cesar at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |openacc
--- Comment #3 from cesar at gcc dot gnu.org ---
I'm testing Chung-Lin's fix for PR77371 from gomp-4_0-branch on trunk. It takes
extra care when handling data clauses of Fortran reference-type variables.
>From gcc-bugs-return-606110-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 22:22:00 2018
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From: "karl.may0 at freenet dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/86006] New: compile time error generic type bound procedure
Date: Wed, 30 May 2018 22:21:00 -0000
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Bug ID: 86006
Summary: compile time error generic type bound procedure
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Version: 8.1.0
Status: UNCONFIRMED
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Priority: P3
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This code:
Module Mod_LL_DT
Implicit None
Private
Type, Public :: LLCont_DT
contains
Generic :: GetElement => GetElementByType,GetElementByPosition
Procedure, PAss :: GetElementByType => SubGetElementByType
Procedure, PAss :: GetElementByPosition => SubGetElementByPosition
End type LLCont_DT
contains
Subroutine SubGetElementByType(this,TSIn,TSOut)
Implicit None
Class(LLCont_DT), Intent(InOut) :: this
Class(*), Intent(InOut), Pointer :: TSIn
Class(*), Intent(Out), Pointer :: TSOut
End Subroutine SubGetElementByType
Subroutine SubGetElementByPosition(this,TSC,ISPos)
Implicit None
Class(LLCont_DT), Intent(InOut) :: this
Class(*), Intent(InOut), Pointer :: TSC
Integer*8, Intent(In) :: ISPos
End Subroutine SubGetElementByPosition
End Module Mod_LL_DT
yields:
Generic :: GetElement => GetElementByType,GetElementByPosition
1
Error: ‘subgetelementbytype’ and ‘subgetelementbyposition’ for GENERIC
‘getelement’ at (1) are ambiguous
using compiler opiton:
gfortran -c tmp.f90
>From my understanding this should work. It also compiles without error with
other compilers (e.g. ifort)
Cheers
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Subject: [Bug middle-end/85369] no -Wstringop-overflow for a strcpy / stpcpy call with a nonstring pointer when providing movstr pattern
Date: Wed, 30 May 2018 22:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85369
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Wed May 30 22:24:43 2018
New Revision: 260976
URL: https://gcc.gnu.org/viewcvs?rev=260976&root=gcc&view=rev
Log:
PR middle-end/85369 - no -Wstringop-overflow for a strcpy / stpcpy call with a
nonstring pointer when providing movstr pattern
gcc/ChangeLog:
PR middle-end/85369
* builtins.c (expand_builtin_stpcpy_1): New function.
(expand_builtin_stpcpy): Call it, and call maybe_warn_nonstring_arg
only if the former succeeds.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/builtins.c
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Subject: [Bug middle-end/85369] no -Wstringop-overflow for a strcpy / stpcpy call with a nonstring pointer when providing movstr pattern
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Committed in r260976.
>From gcc-bugs-return-606113-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 22:46:39 2018
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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/86004] [9 regression] Several lto test cases begin failing with r260963
Date: Wed, 30 May 2018 22:46:00 -0000
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--- Comment #1 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Can you please check in g++.log what kind of error you get?
Incremental linking now produce LTO objects while previously it did produce
final binary. I went through testcases where this makes difference and added
-flinker-output=nolto-rel for them to force original behavior.
Adding -flinker-output=nolto-rel to extra-ld-options will likely make the
errors go away, but I would like to know what errors you get because I don't
get them on x86-64.
Honza
>From gcc-bugs-return-606114-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 30 22:49:36 2018
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From: "stefantalpalaru at yahoo dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug pch/86007] New: precompiled header on bdver2 with -march=native triggers a "created and used with differing settings of '-mlwp'" warning, intermittently
Date: Wed, 30 May 2018 22:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86007
Bug ID: 86007
Summary: precompiled header on bdver2 with -march=native
triggers a "created and used with differing settings
of '-mlwp'" warning, intermittently
Product: gcc
Version: 8.1.0
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I came upon this bug in a more complex case, when compiling Natron on Gentoo
~amd64 when the PCH compilation warning turned into a "one or more PCH files
were found, but they were invalid" error later on:
https://github.com/4nykey/4nykey/issues/20
I managed to come up with a simple test case replicating only the warning,
intermittently:
https://gist.github.com/stefantalpalaru/3e984cf56c2eea462ae761143e0d0dfd
I hope it's enough to figure out why -march=native can fail to detect LWP when
creating the precompiled header on my FX-8320E.
It might be related to this builtin arch detection bug that is also manifested
on my CPU: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85591
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Subject: [Bug target/85591] __builtin_cpu_is() is not detecting bdver2 with Model = 0x02
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--- Comment #1 from Ștefan Talpalaru <stefantalpalaru at yahoo dot com> ---
I can confirm this on an FX-8320E.
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Subject: [Bug c/55976] -Werror=return-type should error on returning a value from a void function
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--- Comment #11 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Wed May 30 22:55:38 2018
New Revision: 260978
URL: https://gcc.gnu.org/viewcvs?rev=260978&root=gcc&view=rev
Log:
2018-05-30 David Pagan <dave.pagan@oracle.com>
PR c/55976
* c-decl.c (grokdeclarator): Update check for return type warnings.
(start_function): Likewise.
(finish_function): Likewise.
* c-typeck.c (c_finish_return): Update check for return type warnings.
Pass OPT_Wreturn_type to pedwarn when appropriate.
PR c/55976
* c-opts.c (c_common_post_options): Set default for warn_return_type
for C++/C++ with ObjC extensions only. For C, makes it possible to
differentiate between default (no option), -Wreturn-type, and
-Wno-return-type.
PR c/55976
* gcc.dg/noncompile/pr55976-1.c: New test.
* gcc.dg/noncompile/pr55976-2.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/noncompile/pr55976-1.c
trunk/gcc/testsuite/gcc.dg/noncompile/pr55976-2.c
Modified:
trunk/gcc/c-family/ChangeLog
trunk/gcc/c-family/c-opts.c
trunk/gcc/c/ChangeLog
trunk/gcc/c/c-decl.c
trunk/gcc/c/c-typeck.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/77777] Use rich location to mark correct expression for "invalid use of non-static member function"
Date: Wed, 30 May 2018 23:14:00 -0000
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--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed May 30 23:13:48 2018
New Revision: 260979
URL: https://gcc.gnu.org/viewcvs?rev=260979&root=gcc&view=rev
Log:
PR c++/77777 improve location for diagnostic
Pass in the location of the invalid expression, not the next input
location (which might be a comma or closing parenthesis on a different
line).
gcc/cp:
PR c++/77777
* call.c (resolve_args): Use location of expression, not current input
location.
gcc/testsuite:
PR c++/77777
* g++.dg/diagnostic/pr77777.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/diagnostic/pr77777.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/call.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/77777] Use rich location to mark correct expression for "invalid use of non-static member function"
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed on trunk.
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From: "vincent-gcc at vinc17 dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85995] GCC defines __STDC__ and __STDC_VERSION__ even when used with options that break C conformance
Date: Thu, 31 May 2018 00:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85995
--- Comment #2 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
I don't see the point of defining both __STDC__ and __STDC_VERSION__ if GCC
cannot guarantee anything about standard conformance. With the current state,
it is not possible to test these macros in order to write code based on the C
standard, which could fail otherwise.
>From gcc-bugs-return-606120-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 31 00:10:01 2018
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From: "roland at gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85662] [8/9 Regression] "error: non-constant condition for static assertion" from __builtin_offsetof in C++
Date: Thu, 31 May 2018 00:10:00 -0000
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roland at gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |---
--- Comment #9 from roland at gnu dot org ---
Both my original test case and Jakub's smaller case do hit the bug in gcc 7.
I just tested the current gcc-7-branch: commit
c66c7f7b6f41118cef03ece0c367554eb38c3d65
On x86_64-linux-gnu:
$ ../../gcc/configure --enable-languages=c,c++,lto
$ make all-gcc
$ ./gcc/xgcc -Bgcc/ -O2 -S bar.cc
bar.cc:3:1: error: non-constant condition for static assertion
static_assert (__builtin_offsetof (T, f.x[31 - 1]) == __builtin_offsetof (T,
f.x[30]), "");
^~~~~~~~~~~~~
bar.cc:3:1: error: value ‘8’ of type ‘T*’ is not a constant expression
[Exit 1]
$ cat bar.cc
struct S { unsigned long x[31]; };
struct T { bool b; S f; };
static_assert (__builtin_offsetof (T, f.x[31 - 1]) == __builtin_offsetof (T,
f.x[30]), "");
$
>From gcc-bugs-return-606121-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 31 01:18:26 2018
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From: "gcc at mattwhitlock dot name" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/86008] New: std::quoted(std::basic_string_view) is missing
Date: Thu, 31 May 2018 01:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86008
Bug ID: 86008
Summary: std::quoted(std::basic_string_view) is missing
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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The following code should compile without error in C++17 mode:
/* BEGIN TEST CODE */
#include <iomanip>
#include <iostream>
#include <string>
#include <string_view>
using namespace std::literals;
int main() {
std::cout << std::quoted("foo") << '\n' // OK
<< std::quoted("bar"s) << '\n' // OK
<< std::quoted("baz"sv) << std::endl; // ERROR!
return 0;
}
/* END TEST CODE */
The following shim allows the code above to compile, although it is sub-optimal
because it captures a std::basic_string_view by reference.
#if __cpp_lib_quoted_string_io <= 201304
namespace std {
template<typename _CharT, typename _Traits>
inline auto
quoted(const basic_string_view<_CharT, _Traits> &__sv,
_CharT __delim = _CharT('"'), _CharT __escape = _CharT('\\'))
{
return __detail::_Quoted_string<
const basic_string_view<_CharT, _Traits> &, _CharT>(
__sv, __delim, __escape);
}
}
#endif
The std::basic_string_view cannot be captured by value due to a static
assertion in std::__detail::_Quoted_string that requires the _String type
template argument to be a pointer or reference type.
The relevant C++ standard specifying std::quoted(std::basic_string_view) is:
https://cplusplus.github.io/LWG/issue2785
>From gcc-bugs-return-606122-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 31 02:08:31 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/79751] Concept placeholder on another concept does not work
Date: Thu, 31 May 2018 02:08:00 -0000
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Hubert Tong <hstong at ca dot ibm.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hstong at ca dot ibm.com
--- Comment #1 from Hubert Tong <hstong at ca dot ibm.com> ---
N4674 subclause 10.1.8 [dcl.spec.concept] paragraph 3:
[ ... ] nor shall a concept definition have associated constraints.
It looks like the program should not compile.
>From gcc-bugs-return-606123-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 31 02:23:42 2018
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From: "hstong at ca dot ibm.com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/86009] New: [Concepts] Placeholder as argument to partial-concept-id forms extra constrained parameters
Date: Thu, 31 May 2018 02:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86009
Bug ID: 86009
Summary: [Concepts] Placeholder as argument to
partial-concept-id forms extra constrained parameters
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: rejects-valid
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When a partial-concept-id is formed with a constrained-type-specifier as an
argument, extra parameters are invented by GCC.
### SOURCE (<stdin>):
template <typename T, typename U> concept bool C0 = true;
template <typename T> concept bool C1 = true;
void f(C0<C1> *) { }
template void f<wchar_t, short>(wchar_t *);
### COMPILER INVOCATION COMMAND:
g++ -fsyntax-only -xc++ -fconcepts -
### ACTUAL OUTPUT:
<stdin>:5:15: error: template-id 'f<wchar_t, short int>' for 'void f(wchar_t*)'
does not match any template declaration
<stdin>:3:6: note: candidate is: 'template<class auto:1, class auto:2, class
auto:3, class auto:4> requires C1<auto:1> and C0<auto:2, auto:1> and
C1<auto:3> and C0<auto:4, auto:3> void f(auto:4*)'
### EXPECTED OUTPUT:
(Clean compile).
### COMPILER VERSION INFO (g++ -v):
Using built-in specs.
COLLECT_GCC=/opt/wandbox/gcc-head/bin/g++
COLLECT_LTO_WRAPPER=/opt/wandbox/gcc-head/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../source/configure --prefix=/opt/wandbox/gcc-head
--enable-languages=c,c++ --disable-multilib --without-ppl --without-cloog-ppl
--enable-checking=release --disable-nls --enable-lto
LDFLAGS=-Wl,-rpath,/opt/wandbox/gcc-head/lib,-rpath,/opt/wandbox/gcc-head/lib64,-rpath,/opt/wandbox/gcc-head/lib32
Thread model: posix
gcc version 9.0.0 20180529 (experimental) (GCC)
>From gcc-bugs-return-606124-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 31 02:41:19 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 tree-optimization/86010] New: [7/8 Regression] redundant memset with smaller size not eliminated
Date: Thu, 31 May 2018 02:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86010
Bug ID: 86010
Summary: [7/8 Regression] redundant memset with smaller size
not eliminated
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Both GCC 6 and Clang 3.5 and later emit equally efficient code for both
functions in the test case below. Starting with GCC 7, the code emitted for
h() is suboptimal.
$ cat b.c && gcc -O2 -S -Wall -fdump-tree-optimized=/dev/stdout b.c
void f (void*);
void g (void)
{
char a[8];
__builtin_memset (a, 0, 8);
__builtin_memset (a, 0, 8);
f (a);
}
void h (void)
{
char a[8];
__builtin_memset (a, 0, 8);
__builtin_memset (a, 0, 7);
f (a);
}
;; Function g (g, funcdef_no=0, decl_uid=1958, cgraph_uid=0, symbol_order=0)
g ()
{
char a[8];
<bb 2> [local count: 1073741825]:
__builtin_memset (&a, 0, 8);
f (&a);
a ={v} {CLOBBER};
return;
}
;; Function h (h, funcdef_no=1, decl_uid=1962, cgraph_uid=1, symbol_order=1)
h ()
{
char a[8];
<bb 2> [local count: 1073741825]:
__builtin_memset (&MEM[(void *)&a + 6B], 0, 2);
__builtin_memset (&a, 0, 7);
f (&a);
a ={v} {CLOBBER};
return;
}
>From gcc-bugs-return-606125-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 31 02:44:51 2018
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Subject: [Bug tree-optimization/86010] [7/8 Regression] redundant memset with smaller size not eliminated
Date: Thu, 31 May 2018 02:44:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
The difference is better seen in the assembly output for the two functions:
g:
.cfi_startproc
subq $24, %rsp
.cfi_def_cfa_offset 32
movq $0, 8(%rsp)
leaq 8(%rsp), %rdi
call f
addq $24, %rsp
.cfi_def_cfa_offset 8
ret
.cfi_endproc
h:
.cfi_startproc
subq $24, %rsp
.cfi_def_cfa_offset 32
xorl %eax, %eax
xorl %edx, %edx
leaq 8(%rsp), %rdi
movw %ax, 14(%rsp)
movl $0, 8(%rsp)
movw %dx, 12(%rsp)
call f
addq $24, %rsp
.cfi_def_cfa_offset 8
ret
.cfi_endproc
Clang 6 emits the following:
g():
push rax
mov qword ptr [rsp], 0
mov rdi, rsp
call f(void*)
pop rax
ret
h():
push rax
mov qword ptr [rsp], 0
mov rdi, rsp
call f(void*)
pop rax
ret
>From gcc-bugs-return-606126-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 31 04:43:56 2018
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From: "patrick at motec dot com.au" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/86011] New: Inefficient code generated for ldivmod with constant value
Date: Thu, 31 May 2018 04:43:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86011
Bug ID: 86011
Summary: Inefficient code generated for ldivmod with constant
value
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: other
Assignee: unassigned at gcc dot gnu.org
Reporter: patrick at motec dot com.au
Target Milestone: ---
Tested with 7.2.0 and 8.1.0.
The following example unnecessarily calls ldivmod twice:
struct foo { long a, b; };
struct foo test(long long x)
{
return (struct foo){x / 77, x % 77};
}
armv7m-linux-musleabi-gcc -c -O2 test.c
armv7m-linux-musleabi-objdump -d test.o
00000000 <test>:
0: b5d0 push {r4, r6, r7, lr}
2: 4616 mov r6, r2
4: 461f mov r7, r3
6: 4604 mov r4, r0
8: 224d movs r2, #77 ; 0x4d
a: 2300 movs r3, #0
c: 4630 mov r0, r6
e: 4639 mov r1, r7
10: f7ff fffe bl 0 <__aeabi_ldivmod>
14: 4639 mov r1, r7
16: 6020 str r0, [r4, #0]
18: 224d movs r2, #77 ; 0x4d
1a: 4630 mov r0, r6
1c: 2300 movs r3, #0
1e: f7ff fffe bl 0 <__aeabi_ldivmod>
22: 4620 mov r0, r4
24: 6062 str r2, [r4, #4]
26: bdd0 pop {r4, r6, r7, pc}
If the test is rearranged so that the denominator is a function argument the
generated code is as expected:
struct foo { long a, b; };
struct foo test(long long x, long den)
{
return (struct foo){x / den, x % den};
}
armv7m-linux-musleabi-gcc -c -O2 test.c
armv7m-linux-musleabi-objdump -d test.o
00000000 <test>:
0: b5d0 push {r4, r6, r7, lr}
2: 4616 mov r6, r2
4: 461f mov r7, r3
6: 9a04 ldr r2, [sp, #16]
8: 4604 mov r4, r0
a: 4639 mov r1, r7
c: 4630 mov r0, r6
e: 17d3 asrs r3, r2, #31
10: f7ff fffe bl 0 <__aeabi_ldivmod>
14: e9c4 0200 strd r0, r2, [r4]
18: 4620 mov r0, r4
1a: bdd0 pop {r4, r6, r7, pc}
>From gcc-bugs-return-606127-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 31 05:40:44 2018
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From: "asb at lowrisc dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86005] [RISCV] Invalid intermixing of __atomic_* libcalls and inline atomic instruction sequences
Date: Thu, 31 May 2018 05:40:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86005
Alex Bradbury <asb at lowrisc dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |asb at lowrisc dot org
Summary|[RISCV] Invalid lowering of |[RISCV] Invalid intermixing
|atomics for -march=rv32i / |of __atomic_* libcalls and
|-march=rv64i |inline atomic instruction
| |sequences
--- Comment #1 from Alex Bradbury <asb at lowrisc dot org> ---
Actually I think this bug is wider in scope than I first thought. GCC will also
intermix __atomic libcalls and inline instruction sequences with -march=rv32ia
when values less than XLEN in size are accessed.
$ cat foo.c
char atomic(char *i) {
char j = __atomic_add_fetch(i, 1, __ATOMIC_SEQ_CST);
char k;
__atomic_load(i, &k, __ATOMIC_SEQ_CST);
return j+k;
}
$ ./riscv32-unknown-elf-gcc -march=rv32ia foo.c -O1 -S -o -
.file "foo.c"
.option nopic
.text
.align 2
.globl atomic
.type atomic, @function
atomic:
addi sp,sp,-16
sw ra,12(sp)
sw s0,8(sp)
mv s0,a0
li a2,5
li a1,1
call __atomic_fetch_add_1
addi a0,a0,1
andi a0,a0,0xff
fence iorw,iorw
lbu a5,0(s0)
fence iorw,iorw
add a0,a0,a5
andi a0,a0,0xff
lw ra,12(sp)
lw s0,8(sp)
addi sp,sp,16
jr ra
.size atomic, .-atomic
.ident "GCC: (GNU) 9.0.0 20180530 (experimental)"
>From gcc-bugs-return-606128-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 31 05:52:48 2018
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From: Andrew Waterman <andrew@sifive.com>
Date: Thu, 31 May 2018 05:52:00 -0000
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Subject: Re: [Bug target/86005] [RISCV] Invalid intermixing of __atomic_* libcalls and inline atomic instruction sequences
To: asb at lowrisc dot org <gcc-bugzilla@gcc.gnu.org>
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I realize the documentation doesn't concur with me, but as long as gcc
and libgcc agree on the lock-freeness of the routines, I don't see the
harm. (wrt. rv32ia, at least.)
On Wed, May 30, 2018 at 10:40 PM, asb at lowrisc dot org
<gcc-bugzilla@gcc.gnu.org> wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id†005
>
> Alex Bradbury <asb at lowrisc dot org> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> CC| |asb at lowrisc dot org
> Summary|[RISCV] Invalid lowering of |[RISCV] Invalid intermixing
> |atomics for -march=rv32i / |of __atomic_* libcalls and
> |-march=rv64i |inline atomic instruction
> | |sequences
>
> --- Comment #1 from Alex Bradbury <asb at lowrisc dot org> ---
> Actually I think this bug is wider in scope than I first thought. GCC will also
> intermix __atomic libcalls and inline instruction sequences with -march=rv32ia
> when values less than XLEN in size are accessed.
>
> $ cat foo.c
> char atomic(char *i) {
> char j = __atomic_add_fetch(i, 1, __ATOMIC_SEQ_CST);
> char k;
> __atomic_load(i, &k, __ATOMIC_SEQ_CST);
> return j+k;
> }
>
> $ ./riscv32-unknown-elf-gcc -march=rv32ia foo.c -O1 -S -o -
> .file "foo.c"
> .option nopic
> .text
> .align 2
> .globl atomic
> .type atomic, @function
> atomic:
> addi sp,sp,-16
> sw ra,12(sp)
> sw s0,8(sp)
> mv s0,a0
> li a2,5
> li a1,1
> call __atomic_fetch_add_1
> addi a0,a0,1
> andi a0,a0,0xff
> fence iorw,iorw
> lbu a5,0(s0)
> fence iorw,iorw
> add a0,a0,a5
> andi a0,a0,0xff
> lw ra,12(sp)
> lw s0,8(sp)
> addi sp,sp,16
> jr ra
> .size atomic, .-atomic
> .ident "GCC: (GNU) 9.0.0 20180530 (experimental)"
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2018-05-09 0:35 ` [Bug target/85666] gcc-8.0.1 fails to build mmix target: gcc/libgcc/libgcc2.h:203:20: internal compiler error: in leaf_function_p, at final.c:4488 hp at gcc dot gnu.org
2018-05-28 0:07 ` hp at gcc dot gnu.org
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