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* [Bug tree-optimization/83351] New: Missed optimization in math expression: sin^2(a) + cos^2(a) == 1
@ 2017-12-10 13:48 zamazan4ik at tut dot by
2021-12-15 21:57 ` [Bug tree-optimization/83351] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: zamazan4ik at tut dot by @ 2017-12-10 13:48 UTC (permalink / raw)
To: gcc-bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83351
Bug ID: 83351
Summary: Missed optimization in math expression: sin^2(a) +
cos^2(a) == 1
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zamazan4ik at tut dot by
Target Milestone: ---
gcc(trunk) with '--std=c++17 -O3 -march=native -ffast-math' flags for this
code:
#include <cmath>
double test(double a)
{
return cos(a) * cos(a) + sin(a) * sin(a);
}
generates this assembly:
test(double):
sub rsp, 24
mov rsi, rsp
lea rdi, [rsp+8]
call sincos
vmovsd xmm1, QWORD PTR [rsp+8]
vmovsd xmm0, QWORD PTR [rsp]
add rsp, 24
vmulsd xmm1, xmm1, xmm1
vfmadd132sd xmm0, xmm1, xmm0
ret
But there is formula: sin^2(a) + cos^2(a) == 1. And it can be compiled in
faster way.
>From gcc-bugs-return-584729-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 13:56:04 2017
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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/83326] [8 Regression] SPEC CPU2017 648.exchange2_s ~6% performance regression with r255267 (reproducer attached)
Date: Sun, 10 Dec 2017 13:56:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2017-12-10
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I will investigate.
>From gcc-bugs-return-584730-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 13:57:29 2017
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/83332] [8 regression] new test case gfortran.dg/vect/pr81303.f fails (r255499)
Date: Sun, 10 Dec 2017 13:57:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2017-12-10
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Possibly a similar reason as x86, vect_cond_mixed is set but you cannot do
V2DIV2DF mixed condition handling?
>From gcc-bugs-return-584731-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 14:00:38 2017
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Subject: [Bug fortran/80645] FAIL: gfortran.dg/elemental_subroutine_3.f90 -O1 (test for excess errors)
Date: Sun, 10 Dec 2017 14:00:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|NEW |WAITING
Target Milestone|8.0 |---
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
The regression is the diagnostic which is output even though no range info is
available.
Anyway, WAITING for Fortran folks to settle the wrong-code dispute.
>From gcc-bugs-return-584732-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 14:02:55 2017
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Subject: [Bug c/81875] omp for loop optimized away
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--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
Proposed to backport to 6/7 branch (
https://gcc.gnu.org/ml/gcc-patches/2017-12/msg00574.html ).
>From gcc-bugs-return-584733-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 14:15:07 2017
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Subject: [Bug middle-end/81889] [7/8 Regression] bogus warnings with -Wmaybe-uninitialized -O3
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
There is a path in the IL that has the array not initialized which is when
n is 0.
# iftmp.13_23 = PHI <_31(3), 1(36)>
_2 = *n_34(D);
_107 = (integer(kind=8)) _2;
if (_2 > 3)
goto <bb 5>; [50.00%]
else
goto <bb 6>; [50.00%]
<bb 6> [local count: 161061274]:
_39 = _107 + -1;
_40 = _39 < 0;
if (_40 != 0)
goto <bb 33>; [50.00%]
else
goto <bb 7>; [50.00%]
then we also somehow end up with a lot of threaded(?) paths exposing all
(and even impossible) loads from xx. Note the warnings are _all_ from
the path dominated by the n <= 3 check! So the warning is obviously
valid just the compiler-generated code must be dead in some way it doesn't
see...
Need some closer investigation, mine for that.
>From gcc-bugs-return-584734-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 14:27:19 2017
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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/80645] FAIL: gfortran.dg/elemental_subroutine_3.f90 -O1 (test for excess errors)
Date: Sun, 10 Dec 2017 14:27:00 -0000
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--- Comment #10 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Anyway, WAITING for Fortran folks to settle the wrong-code dispute.
AFAIU the code is valid Fortran
x(4:1:-1) = x((/1,3,2,4/))
x((/1,3,2,4/)) use a temporary array of size 4 and
tmp(1)=x(1)
tmp(2)=x(3)
tmp(3)=x(2)
tmp(4)=x(4)
then this temporaries assigned to the fist four elements of x as
x(4)=tmp(1)
x(3)=tmp(2)
x(2)=tmp(3)
x(1)=tmp(4)
and it is what I see in the dump of the reduced test
program test
implicit none
type mytype
integer x
end type mytype
type(mytype) :: x(6) = (/mytype(1),mytype(2),mytype(3), &
mytype(4),mytype(5), mytype(6)/)
print *, x
x(4:1:-1) = x((/1,3,2,4/))
print *, x
end program test
>From gcc-bugs-return-584735-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 14:30:34 2017
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Subject: [Bug testsuite/82006] [8 Regression] ERROR: torture-init: torture_without_loops is not empty as expected
Date: Sun, 10 Dec 2017 14:30:00 -0000
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--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, builtins.exp references $LTO_TORTURE_OPTIONS. Does the issue only
reproduce with builtins.exp or also other .exp files?
How does check_effective_target_lto behave on mingw32 currently?
Unfortunately I don't speak TCL a bit (doing cut&paste programming on that part
of GCC...) nor do I have a mingw setup to reproduce the issue.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83352] New: Missed optimization in math expression: sqrt(sqrt(a)) == pow(a, 1/4)
Date: Sun, 10 Dec 2017 14:54:00 -0000
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Bug ID: 83352
Summary: Missed optimization in math expression: sqrt(sqrt(a))
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Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zamazan4ik at tut dot by
Target Milestone: ---
gcc(trunk) with '--std=c++17 -O3 -march=native -ffast-math' flags for this
code:
#include <cmath>
double test(double a)
{
return sqrt(sqrt(a));
}
generates this assembly:
test(double): # @test(double)
vsqrtsd xmm0, xmm0, xmm0
vsqrtsd xmm0, xmm0, xmm0
ret
But there is formula: sqrt(sqrt(a)) == pow(a, 1/4). And it can be compiled in
faster way.
>From gcc-bugs-return-584737-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 15:12:14 2017
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Subject: [Bug middle-end/83069] [8 Regression] internal compiler error: in from_gcov_type, at profile-count.h:676
Date: Sun, 10 Dec 2017 15:12:00 -0000
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Jan Hubicka <hubicka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #16 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
I made typo in PR number, but it is fixed by
2017-12-08 Jan Hubicka <hubicka@ucw.cz>
PR middle-end/83609
* profile-count.c (profile_count::from_gcov_type): Move from
profile-count.h; handle overflow.
* profile-count.h (profile_count::from_gcov_type): Move offline.
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The first patch
>From gcc-bugs-return-584739-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 15:37:13 2017
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The second patch
>From gcc-bugs-return-584740-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 15:48:22 2017
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From: "zamazan4ik at tut dot by" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83353] New: Missed optimization in math expression: sin(asin(a)) == a
Date: Sun, 10 Dec 2017 15:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83353
Bug ID: 83353
Summary: Missed optimization in math expression: sin(asin(a))
== a
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zamazan4ik at tut dot by
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gcc(trunk) with '--std=c++17 -O3 -march=native -ffast-math' flags for this
code:
#include <cmath>
double test(double a)
{
return sin(asin(a));
}
generates this assembly:
test(double):
sub rsp, 8
call __asin_finite
add rsp, 8
jmp sin
But sin(asin(a)) == a. So there is no reason to call anything.
>From gcc-bugs-return-584741-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 15:50:30 2017
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Subject: [Bug tree-optimization/83353] Missed optimization in math expression: sin(asin(a)) == a
Date: Sun, 10 Dec 2017 15:50:00 -0000
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--- Comment #1 from Alexander Zaitsev <zamazan4ik at tut dot by> ---
The same issue about cos(acos(x)).
>From gcc-bugs-return-584742-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 16:22:51 2017
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83354] New: Missed optimization in math expression: pow(cbrt(x), y) == pow(x, y / 3)
Date: Sun, 10 Dec 2017 16:22:00 -0000
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Bug ID: 83354
Summary: Missed optimization in math expression: pow(cbrt(x),
y) == pow(x, y / 3)
Product: gcc
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gcc(trunk) with '--std=c++17 -O3 -march=native -ffast-math' flags for this
code:
#include <cmath>
double test(double x, double y)
{
return pow(cbrt(x),y);
}
generates this assembly:
test(double, double):
sub rsp, 24
vmovsd QWORD PTR [rsp+8], xmm1
call cbrt
vmovsd xmm1, QWORD PTR [rsp+8]
add rsp, 24
jmp __pow_finite
As you can see, we can simplify it by calling pow(x, y/3). It should be faster.
>From gcc-bugs-return-584743-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 17:43:52 2017
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #42824|0 |1
is obsolete| |
--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 42825
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The second patch
>From gcc-bugs-return-584744-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 19:11:57 2017
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From: "dominiq at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/53478] gfortran segfaults when module name clashes with C binding name of procedure
Date: Sun, 10 Dec 2017 19:11:00 -0000
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--- Comment #10 from dominiq at gcc dot gnu.org ---
Author: dominiq
Date: Sun Dec 10 19:11:18 2017
New Revision: 255530
URL: https://gcc.gnu.org/viewcvs?rev=255530&root=gcc&view=rev
Log:
2017-12-10 Dominique d'Humieres <dominiq@lps.ens.fr>
PR fortran/53478
* gfortran.h (gfc_find_case_gsymbol): New prototype.
* symbol.c (gfc_find_case_gsymbol): New procedure, case
insensistive version of gfc_find_gsymbol.
* resolve.c (resolve_common_blocks): Use it.
Replace %s with %qs where needed.
* gfortran.dg/binding_label_tests_4.f03: Update dg-error.
* gfortran.dg/binding_label_tests_6.f03: Likewise.
* gfortran.dg/binding_label_tests_7.f03: Likewise.
* gfortran.dg/binding_label_tests_8.f03: Likewise.
* gfortran.dg/binding_label_tests_10_main.f03: Likewise.
* gfortran.dg/binding_label_tests_11_main.f03: Likewise.
* gfortran.dg/binding_label_tests_13_main.f03: Likewise.
* gfortran.dg/test_common_binding_labels_3_main.f03: Likewise.
* gfortran.dg/binding_label_tests_29.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/binding_label_tests_29.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/gfortran.h
trunk/gcc/fortran/resolve.c
trunk/gcc/fortran/symbol.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gfortran.dg/binding_label_tests_10_main.f03
trunk/gcc/testsuite/gfortran.dg/binding_label_tests_11_main.f03
trunk/gcc/testsuite/gfortran.dg/binding_label_tests_13_main.f03
trunk/gcc/testsuite/gfortran.dg/binding_label_tests_4.f03
trunk/gcc/testsuite/gfortran.dg/binding_label_tests_6.f03
trunk/gcc/testsuite/gfortran.dg/binding_label_tests_7.f03
trunk/gcc/testsuite/gfortran.dg/binding_label_tests_8.f03
trunk/gcc/testsuite/gfortran.dg/test_common_binding_labels_3_main.f03
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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/53478] gfortran segfaults when module name clashes with C binding name of procedure
Date: Sun, 10 Dec 2017 19:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53478
Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #11 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Closing.
>From gcc-bugs-return-584746-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 19:56:26 2017
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Subject: [Bug libstdc++/83237] Values returned by std::poisson_distribution are not distributed correctly
Date: Sun, 10 Dec 2017 19:56:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Last reconfirmed| |2017-12-10
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>From gcc-bugs-return-584747-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 20:28:36 2017
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From: "andi-gcc at firstfloor dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug gcov-profile/83355] New: autofdo g++.dg/bprob/g++-bprob-1.C FAILS with ICE
Date: Sun, 10 Dec 2017 20:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83355
Bug ID: 83355
Summary: autofdo g++.dg/bprob/g++-bprob-1.C FAILS with ICE
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: gcov-profile
Assignee: unassigned at gcc dot gnu.org
Reporter: andi-gcc at firstfloor dot org
CC: marxin at gcc dot gnu.org
Target Milestone: ---
Running in gdb shows that there is a very deep recursion in get_index_by_decl
until it overflows the stack.
This patch seems to fix it (but not sure why the abstract origin would point to
itself)
diff --git a/gcc/auto-profile.c b/gcc/auto-profile.c
index 5134a795331..403709bad6b 100644
--- a/gcc/auto-profile.c
+++ b/gcc/auto-profile.c
@@ -477,7 +477,7 @@ string_table::get_index_by_decl (tree decl) const
ret = get_index (lang_hooks.dwarf_name (decl, 0));
if (ret != -1)
return ret;
- if (DECL_ABSTRACT_ORIGIN (decl))
+ if (DECL_ABSTRACT_ORIGIN (decl) && DECL_ABSTRACT_ORIGIN (decl) != decl)
return get_index_by_decl (DECL_ABSTRACT_ORIGIN (decl));
return -1;
Backtrace:
Program received signal SIGSEGV, Segmentation fault.
0x00000000016c4ab2 in pp_emit_prefix (pp=0x229b1a0 <actual_pretty_printer>) at
/home/andi/gcc/git/gcc/gcc/pretty-print.c:1485
1485 {
(gdb) up
#1 0x00000000016c4c90 in pp_append_text(pretty_printer*, char const*, char
const*) ()
at /home/andi/gcc/git/gcc/gcc/pretty-print.c:1556
1556 pp_emit_prefix (pp);
(gdb) bt
#0 0x00000000016c4ab2 in pp_emit_prefix (pp=0x229b1a0 <actual_pretty_printer>)
at /home/andi/gcc/git/gcc/gcc/pretty-print.c:1485
#1 0x00000000016c4c90 in pp_append_text(pretty_printer*, char const*, char
const*) ()
at /home/andi/gcc/git/gcc/gcc/pretty-print.c:1556
#2 0x0000000000b12c83 in pp_c_identifier (pp=0x229b1a0
<actual_pretty_printer>, id=<optimized out>)
at /home/andi/gcc/git/gcc/gcc/c-family/c-pretty-print.c:1203
#3 0x0000000000992b46 in dump_decl (flags=0, t=0x7ffff6d2ce40, pp=0x229b1a0
<actual_pretty_printer>)
at /home/andi/gcc/git/gcc/gcc/tree.h:3226
#4 dump_function_name(cxx_pretty_printer*, tree_node*, int) () at
/home/andi/gcc/git/gcc/gcc/cp/error.c:1852
#5 0x00000000009940a4 in lang_decl_name(tree_node*, int, bool) () at
/home/andi/gcc/git/gcc/gcc/cp/error.c:3005
#6 0x0000000000994133 in lang_decl_dwarf_name (decl=<optimized out>,
v=<optimized out>, translate=<optimized out>)
at /home/andi/gcc/git/gcc/gcc/cp/error.c:2977
#7 0x000000000156762a in autofdo::string_table::get_index_by_decl(tree_node*)
const ()
at /home/andi/gcc/git/gcc/gcc/auto-profile.c:477
....
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Subject: [Bug sanitizer/83356] New: [7 regression] excessive stack usage compiling with -O2 -fsanitize=bounds -fsanitize=object-size
Date: Sun, 10 Dec 2017 20:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83356
Bug ID: 83356
Summary: [7 regression] excessive stack usage compiling with
-O2 -fsanitize=bounds -fsanitize=object-size
Product: gcc
Version: 7.2.1
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CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
jakub at gcc dot gnu.org, kcc at gcc dot gnu.org, marxin at gcc dot gnu.org
Target Milestone: ---
Created attachment 42826
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42826&action=edit
The AES crypto implementation from linux, preprocessed
After upgrading from gcc-7.1.1 (20170717) to 7.2.1 (20171130), I observed a
warning when building the kernel in configurations with UBSAN:
x86_64-linux-gcc-7.2.1 -Wframe-larger-than=1024 -fsanitize=bounds
-fsanitize=object-size -fno-strict-aliasing -O2 -Wall -c aes_generic.i
/git/arm-soc/crypto/aes_generic.c: In function 'aes_encrypt':
/git/arm-soc/crypto/aes_generic.c:1371:1: warning: the frame size of 3840 bytes
is larger than 1024 bytes [-Wframe-larger-than=]
/git/arm-soc/crypto/aes_generic.c: In function 'aes_decrypt':
/git/arm-soc/crypto/aes_generic.c:1441:1: warning: the frame size of 3840 bytes
is larger than 1024 bytes [-Wframe-larger-than=]
With gcc-7.1.1, the stack frames were 304 bytes each, gcc-8.0.0 uses 512 bytes,
and with "gcc-7.2.1 -Os -fsanitize=bounds -fsanitize=object-size", it's even
smaller at 56 bytes.
I have only noticed this regression with one file in the kernel so far,
crypto/aes_generic.c, all other files apparently stay below the stack frame
warning limit.
>From gcc-bugs-return-584749-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 20:53:30 2017
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/81875] omp for loop optimized away
Date: Sun, 10 Dec 2017 20:53:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81875
--- Comment #5 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Sun Dec 10 20:52:54 2017
New Revision: 255531
URL: https://gcc.gnu.org/viewcvs?rev=255531&root=gcc&view=rev
Log:
Backport "Fix condition folding in c_parser_omp_for_loop"
2017-12-10 Tom de Vries <tom@codesourcery.com>
backport from trunk:
2017-09-16 Tom de Vries <tom@codesourcery.com>
PR c/81875
* c-parser.c (c_parser_omp_for_loop): Fold only operands of cond, not
cond itself.
* testsuite/libgomp.c/pr81875.c: New test.
Added:
branches/gcc-7-branch/libgomp/testsuite/libgomp.c/pr81875.c
Modified:
branches/gcc-7-branch/gcc/c/ChangeLog
branches/gcc-7-branch/gcc/c/c-parser.c
branches/gcc-7-branch/libgomp/ChangeLog
>From gcc-bugs-return-584750-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 21:37:44 2017
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/81875] omp for loop optimized away
Date: Sun, 10 Dec 2017 21:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81875
--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Sun Dec 10 21:37:08 2017
New Revision: 255532
URL: https://gcc.gnu.org/viewcvs?rev=255532&root=gcc&view=rev
Log:
Backport "Fix condition folding in c_parser_omp_for_loop"
2017-12-10 Tom de Vries <tom@codesourcery.com>
backport from trunk:
2017-09-16 Tom de Vries <tom@codesourcery.com>
PR c/81875
* c-parser.c (c_parser_omp_for_loop): Fold only operands of cond, not
cond itself.
* testsuite/libgomp.c/pr81875.c: New test.
Added:
branches/gcc-6-branch/libgomp/testsuite/libgomp.c/pr81875.c
Modified:
branches/gcc-6-branch/gcc/c/ChangeLog
branches/gcc-6-branch/gcc/c/c-parser.c
branches/gcc-6-branch/libgomp/ChangeLog
>From gcc-bugs-return-584751-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 10 22:29:45 2017
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Subject: [Bug target/81842] -fcf-protection -mcet is incompatible with makecontext family functions
Date: Sun, 10 Dec 2017 22:29:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #42823|0 |1
is obsolete| |
Attachment #42825|0 |1
is obsolete| |
--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 42827
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42827&action=edit
The combined patch
This combined patch replaces the previous 2 patches.
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Subject: [Bug target/81842] -fcf-protection -mcet is incompatible with makecontext family functions
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H.J. Lu <hjl.tools at gmail dot com> changed:
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----------------------------------------------------------------------------
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is obsolete| |
--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 42828
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42828&action=edit
The updated combined patch
>From gcc-bugs-return-584753-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 02:21:29 2017
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Subject: [Bug target/81842] -fcf-protection -mcet is incompatible with makecontext family functions
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The updated combined patch
>From gcc-bugs-return-584755-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 03:04:34 2017
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Subject: [Bug tree-optimization/83357] [Gcc-optimization] wrong code for elements in a union pointed by two different types of global pointers
Date: Mon, 11 Dec 2017 03:04:00 -0000
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--- Comment #1 from Yibiao Yang <yangyibiao at nju dot edu.cn> ---
# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 7.2.0-8ubuntu3'
--with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-7
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --with-target-system-zlib --enable-objc-gc=auto
--enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 7.2.0 (Ubuntu 7.2.0-8ubuntu3)
>From gcc-bugs-return-584754-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 03:04:15 2017
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83357] New: [Gcc-optimization] wrong code for elements in a union pointed by two different types of global pointers
Date: Mon, 11 Dec 2017 03:04:00 -0000
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Bug ID: 83357
Summary: [Gcc-optimization] wrong code for elements in a union
pointed by two different types of global pointers
Product: gcc
Version: 7.2.0
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$ cat small.c
int printf(const char *, ...);
union a {
int b;
long c;
} e[] = {{0}, {8}};
int d = 0;
int *f = &e[1].b;
long *g = &e[1].c;
void h() {
for (; d < 2; d++) {
*g = 0;
if (*f)
return;
}
return;
}
int main() {
h();
printf("%d\n", d);
}
$ gcc -O0 small.c; ./a.out
2
$ gcc -O3 small.c; ./a.out
0
$ clang -fsanitize=alignment small.c; ./a.out
2
I am not very sure whether there exist any undefined behavior in this code.
When I am using sanitize option in clang, clang can not detect any undefined
behavior in this code.
>From gcc-bugs-return-584756-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 04:34:40 2017
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Subject: [Bug target/83358] New: [8 Regression] division not converted with Intel tuning since r253934
Date: Mon, 11 Dec 2017 04:34:00 -0000
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Bug ID: 83358
Summary: [8 Regression] division not converted with Intel
tuning since r253934
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The following code snipped came up on the realworldtech forum recently:
#include <stdint.h>
__attribute__((noinline, noclone))
void bin2ascii(uint64_t val, char *dst) {
const int64_t POW10_10 = ((int64_t)10) * 1000 * 1000 * 1000;
int64_t hix = val / POW10_10;
int64_t lox = val % POW10_10;
int32_t v0 = hix / 100000;
int32_t v1 = hix % 100000;
int32_t v2 = lox / 100000;
int32_t v3 = lox % 100000;
for (int i = 4; i != 0; --i) {
dst[i + 0 * 5] = v0 % 10 + '0';
v0 /= 10;
dst[i + 1 * 5] = v1 % 10 + '0';
v1 /= 10;
dst[i + 2 * 5] = v2 % 10 + '0';
v2 /= 10;
dst[i + 3 * 5] = v3 % 10 + '0';
v3 /= 10;
}
dst[0 * 5] = v0 + '0';
dst[1 * 5] = v1 + '0';
dst[2 * 5] = v2 + '0';
dst[3 * 5] = v3 + '0';
dst[4 * 5] = 0;
}
int main() {
char ch[20];
for (int i = 0; i < 10000000; i++) {
bin2ascii(10010155021040540, ch);
}
}
Since r253934 gcc doesn't convert divisions anymore when tuning for Intel with
e.g. -mtune=haswell. The result is ~5x slower than before.
bin2ascii:
.LFB0:
.cfi_startproc
movq %rdi, %rax
pushq %rbx
.cfi_def_cfa_offset 16
.cfi_offset 3, -16
leaq 4(%rsi), %r9
movl $-858993459, %ebx
movabsq $-2601111570856684097, %rdx
movabsq $755578637259143235, %rcx
mulq %rdx
movabsq $10000000000, %rax
movq %rdx, %r8
shrq $38, %rdx
shrq $33, %r8
imulq %r8, %rax
subq %rax, %rdi
movq %rdx, %rax
mulq %rcx
shrq $7, %rdx
movl %edx, %r10d
imulq $100000, %rdx, %rdx
subl %edx, %r8d
movq %rdi, %rdx
shrq $5, %rdx
movq %rdx, %rax
mulq %rcx
movl $10, %ecx
shrq $7, %rdx
movl %edx, %r11d
imulq $100000, %rdx, %rdx
subl %edx, %edi
.L2:
movl %r10d, %eax
decq %r9
cltd
idivl %ecx
movl %r10d, %eax
addl $48, %edx
movb %dl, 1(%r9)
mull %ebx
movl %r8d, %eax
movl %edx, %r10d
cltd
idivl %ecx
movl %r8d, %eax
shrl $3, %r10d
addl $48, %edx
movb %dl, 6(%r9)
mull %ebx
movl %r11d, %eax
movl %edx, %r8d
cltd
idivl %ecx
movl %r11d, %eax
shrl $3, %r8d
addl $48, %edx
movb %dl, 11(%r9)
mull %ebx
movl %edi, %eax
movl %edx, %r11d
cltd
idivl %ecx
movl %edi, %eax
shrl $3, %r11d
addl $48, %edx
movb %dl, 16(%r9)
mull %ebx
movl %edx, %edi
shrl $3, %edi
cmpq %r9, %rsi
jne .L2
addl $48, %r10d
addl $48, %r8d
leal 48(%r11), %edx
addl $48, %edi
movb %r10b, (%rsi)
popq %rbx
.cfi_def_cfa_offset 8
movb %r8b, 5(%rsi)
movb %dl, 10(%rsi)
movb %dil, 15(%rsi)
movb $0, 20(%rsi)
ret
>From gcc-bugs-return-584757-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 04:35:55 2017
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From: "trippels at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/83358] [8 Regression] division not converted with Intel tuning since r253934
Date: Mon, 11 Dec 2017 04:35:00 -0000
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--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
The output above is from:
% gcc -O2 -mtune=haswell foo.i -S -o -
>From gcc-bugs-return-584758-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 05:49:24 2017
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From: "law at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/81889] [7/8 Regression] bogus warnings with -Wmaybe-uninitialized -O3
Date: Mon, 11 Dec 2017 05:48:00 -0000
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Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |law at redhat dot com
--- Comment #5 from Jeffrey A. Law <law at redhat dot com> ---
I wonder why forwprop doesn't simplify bb6 by pushing the RHS of the assignment
to _40 into the use of _40 in the conditional.
I'd guess the fortran front-end's boolean types are goofy and that's getting in
the way of forwprop doing its job. It may be impeding other bits as well.
>From gcc-bugs-return-584759-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 06:19:37 2017
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From: "andrewm.roberts at sky dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug driver/83206] -mfpu=auto does not work on ARM (armv7l-unknown-linux-gnueabihf)
Date: Mon, 11 Dec 2017 06:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83206
--- Comment #18 from Andrew Roberts <andrewm.roberts at sky dot com> ---
Richard, I'm giving the latest snapshot a test, the armv6 version will be
ready in 16 hrs or so...
Meanwhile a question about consistency with gcc -Q --help=target,
and also what happens if you don't specify -mcpu= with =mfpu=auto
tested with gcc version 8.0.0 20171210 (experimental) (GCC)
/usr/local/gcc/bin/gcc -Q --help=target | grep "mcpu\|mfpu\|march"
-march= armv7-a+fp
-mcpu=
-mfpu= vfpv3-d16
/usr/local/gcc/bin/gcc -march=native -Q --help=target | grep
"mcpu\|mfpu\|march"
-march= armv7ve+vfpv3-d16
-mcpu=
-mfpu= vfpv3-d16
/usr/local/gcc/bin/gcc -march=native -mcpu=native -Q --help=target | grep
"mcpu\|mfpu\|march"
-march= armv7ve+vfpv3-d16
-mcpu= cortex-a7
-mfpu= vfpv3-d16
/usr/local/gcc/bin/gcc -march=native -mcpu=native -mfpu=auto -Q --help=target |
grep "mcpu\|mfpu\|march"
-march= armv7ve
-mcpu= cortex-a7
-mfpu= auto
So without anything specified generic arch is given and also a fpu.
-march=native fills in the arch with the correct one
whereas -mfpu=auto just says auto rather than what was selected
march=native gives different results depending on if -mfpu=auto is set
How does mfpu=auto impact cross compuilers? Will it just not be available? What
will happen in the future when its the default?
This was all on the Big/Little ODROID XU4, so it should really have been:
-mcpu= cortex-a15.cortex-a7
When the patches for that issue land.
>From gcc-bugs-return-584760-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 06:38:16 2017
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Subject: [Bug tree-optimization/83359] New: [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2362
Date: Mon, 11 Dec 2017 06:38:00 -0000
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Bug ID: 83359
Summary: [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at
internal-fn.c:2362
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
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gcc-8.0.0-alpha20171126 snapshot (r255155) ICEs when compiling the following
snippet w/ -O3 (-Ofast) -floop-parallelize-all -ftree-parallelize-loops=2:
int uw, m0, wy;
void
bp (int jf, int lz)
{
int *qu = &uw;
int *c5 = &jf;
for (uw = 0; uw < 1; ++uw)
qu = &jf;
while (m0 < 10)
{
for (m0 = 0; m0 < 1; ++m0)
if (jf == 0)
while (jf < 1)
++jf;
else
while (jf < 1)
{
qu = &lz;
++jf;
}
++m0;
}
for (;;)
for (wy = 0; wy < 2; ++wy)
{
if (*qu != 0)
uw = *c5;
c5 = &m0;
lz = 0;
}
}
% powerpc-e300c3-linux-gnu-gcc-8.0.0-alpha20171126 -O3 -floop-parallelize-all
-ftree-parallelize-loops=2 -c -w drtdvf1q.c
during RTL pass: expand
drtdvf1q.c: In function 'bp':
drtdvf1q.c:4:1: internal compiler error: in expand_LOOP_DIST_ALIAS, at
internal-fn.c:2362
bp (int jf, int lz)
^~
0x9b232a expand_LOOP_DIST_ALIAS
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171126/work/gcc-8-20171126/gcc/internal-fn.c:2362
0x724bd7 expand_call_stmt
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171126/work/gcc-8-20171126/gcc/cfgexpand.c:2584
0x724bd7 expand_gimple_stmt_1
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171126/work/gcc-8-20171126/gcc/cfgexpand.c:3607
0x724bd7 expand_gimple_stmt
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171126/work/gcc-8-20171126/gcc/cfgexpand.c:3773
0x726ddf expand_gimple_basic_block
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171126/work/gcc-8-20171126/gcc/cfgexpand.c:5772
0x72cf2f execute
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171126/work/gcc-8-20171126/gcc/cfgexpand.c:6373
>From gcc-bugs-return-584761-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 06:55:28 2017
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/83360] New: make gcc failed, cause classpath/tools/tools.zip:0:0: internal compiler error: in java_mangle_resource_name, at java/mangle.c:657
Date: Mon, 11 Dec 2017 06:55:00 -0000
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Bug ID: 83360
Summary: make gcc failed, cause classpath/tools/tools.zip:0:0:
internal compiler error: in java_mangle_resource_name,
at java/mangle.c:657
Product: gcc
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CTU1000080956:/soter/gcc-4.9.0/build/x86_64-unknown-linux-gnu/32/libjava #
/soter/gcc-4.9.0/build/./gcc/gcj
-B/soter/gcc-4.9.0/build/x86_64-unknown-linux-gnu/32/libjava/
-B/soter/gcc-4.9.0/build/x86_64-unknown-linux-gnu/32/libjava/
-B/soter/gcc-4.9.0/build/./gcc/ -B/usr/local/x86_64-unknown-linux-gnu/bin/
-B/usr/local/x86_64-unknown-linux-gnu/lib/ -isystem
/usr/local/x86_64-unknown-linux-gnu/include -isystem
/usr/local/x86_64-unknown-linux-gnu/sys-include -m32 -ffloat-store
-fomit-frame-pointer -Usun -fclasspath=
-fbootclasspath=../../../../libjava/classpath/lib --encoding=UTF-8
-Wno-deprecated -fbootstrap-classes -findirect-dispatch -fno-bootstrap-classes
-fno-indirect-classes
-fsource-filename=/soter/gcc-4.9.0/build/x86_64-unknown-linux-gnu/32/libjava/classpath/tools/all-classes.lst
-g -O2 -m32 -MT classpath/tools/libgcj_tools_la-tools.lo -MD -MP -MF
classpath/tools/.deps/libgcj_tools_la-tools.Tpo -c classpath/tools/tools.zip
-fPIC -o classpath/tools/.libs/libgcj_tools_la-tools.o
In file included from <built-in>:0:0:
classpath/tools/tools.zip:0:0: internal compiler error: in
java_mangle_resource_name, at java/mangle.c:657
0x553633 java_mangle_resource_name(char const*)
../../gcc/java/mangle.c:657
0x5550c1 compile_resource_data(char const*, char const*, int)
../../gcc/java/resource.c:69
0x55243f parse_zip_file_entries
../../gcc/java/jcf-parse.c:2144
0x55243f java_parse_file()
../../gcc/java/jcf-parse.c:1936
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
>From gcc-bugs-return-584762-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 06:58:45 2017
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Subject: [Bug java/83360] make gcc failed, cause classpath/tools/tools.zip:0:0: internal compiler error: in java_mangle_resource_name, at java/mangle.c:657
Date: Mon, 11 Dec 2017 06:58:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |WONTFIX
Target Milestone|--- |7.0
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Java was removed from GCC in GCC 7. GCC 4.9 is no longer supported.
>From gcc-bugs-return-584763-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 07:03:50 2017
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug java/83360] make gcc failed, cause classpath/tools/tools.zip:0:0: internal compiler error: in java_mangle_resource_name, at java/mangle.c:657
Date: Mon, 11 Dec 2017 07:03:00 -0000
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--- Comment #2 from tottixh10.xianghua at huawei dot com ---
(In reply to Andrew Pinski from comment #1)
> Java was removed from GCC in GCC 7. GCC 4.9 is no longer supported.
Thanks for answering. So I need download GCC 7.x for installation?
>From gcc-bugs-return-584764-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 07:55:39 2017
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From: "glaubitz at physik dot fu-berlin.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug go/83308] Missing platform definitions for SH in libgo
Date: Mon, 11 Dec 2017 07:55:00 -0000
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--- Comment #9 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
I have added "sh" to all relevant places and after uncovering a bug in
qemu-sh4, I managed to build libgo but the no-fpu variant eventually fails to
link:
make[4]: Entering directory
'/build/gcc-7-COw15T/gcc-7-7.2.0/build/sh4-linux-gnu/m4-nofpu/libgo'
/usr/bin/make "AR_FLAGS=" "CC_FOR_BUILD=sh4-linux-gnu-gcc-7" "CC_FOR_TARGET="
"CFLAGS=-g -O2 -m4-nofpu" "CXXFLAGS=-m4-nofpu" "CFLAGS_FOR_BUILD="
"CFLAGS_FOR_TARGET=" "GOC_FOR_TARGET="
"GOC=/build/gcc-7-COw15T/gcc-7-7.2.0/build/./gcc/gccgo
-B/build/gcc-7-COw15T/gcc-7-7.2.0/build/./gcc/ -B/usr/sh4-linux-gnu/bin/
-B/usr/sh4-linux-gnu/lib/ -isystem /usr/sh4-linux-gnu/include -isystem
/usr/sh4-linux-gnu/sys-include -isystem
/build/gcc-7-COw15T/gcc-7-7.2.0/build/sys-include " "GOCFLAGS=-g -O2
-m4-nofpu" "INSTALL=/usr/bin/install -c" "INSTALL_DATA=/usr/bin/install -c -m
644" "INSTALL_PROGRAM=/usr/bin/install -c" "INSTALL_SCRIPT=/usr/bin/install -c"
"LDFLAGS=-Wl,-z,relro -m4-nofpu" "LIBCFLAGS=-m4-nofpu" "LIBCFLAGS_FOR_TARGET="
"MAKE=/usr/bin/make" "MAKEINFO=makeinfo --split-size=5000000 " "PICFLAG="
"PICFLAG_FOR_TARGET=" "SHELL=/bin/bash" "RUNTESTFLAGS=" "exec_prefix=/usr"
"infodir=/usr/share/info" "libdir=/usr/lib" "includedir=/usr/include"
"prefix=/usr" "tooldir=" "gxx_include_dir=" "AR=sh4-linux-gnu-ar" "AS=as"
"LD=/build/gcc-7-COw15T/gcc-7-7.2.0/build/./gcc/collect-ld"
"RANLIB=sh4-linux-gnu-ranlib"
"NM=/build/gcc-7-COw15T/gcc-7-7.2.0/build/./gcc/nm" "NM_FOR_BUILD="
"NM_FOR_TARGET=" "DESTDIR=" "WERROR=" all-recursive
make[5]: Entering directory
'/build/gcc-7-COw15T/gcc-7-7.2.0/build/sh4-linux-gnu/m4-nofpu/libgo'
make[6]: Entering directory
'/build/gcc-7-COw15T/gcc-7-7.2.0/build/sh4-linux-gnu/m4-nofpu/libgo'
make[6]: *** No rule to make target '../libbacktrace/libbacktrace.la', needed
by 'libgo.la'. Stop.
make[6]: Leaving directory
'/build/gcc-7-COw15T/gcc-7-7.2.0/build/sh4-linux-gnu/m4-nofpu/libgo'
Makefile:2757: recipe for target 'all-recursive' failed
make[5]: *** [all-recursive] Error 1
Looking at the build directory, libbacktrace is built:
(sid-sh4-sbuild)root@nofan:/build/gcc-7-COw15T/gcc-7-7.2.0/build/sh4-linux-gnu/libgo#
ls ..
libada libatomic libbacktrace libffi libgcc libgnatvsn libgo libgomp
libstdc++-v3 m4-nofpu
(sid-sh4-sbuild)root@nofan:/build/gcc-7-COw15T/gcc-7-7.2.0/build/sh4-linux-gnu/libgo#
But not for the m4-nofpu variant:
(sid-sh4-sbuild)root@nofan:/build/gcc-7-COw15T/gcc-7-7.2.0/build/sh4-linux-gnu/m4-nofpu/libgo#
ls ..
libffi libgo libgomp libstdc++-v3
(sid-sh4-sbuild)root@nofan:/build/gcc-7-COw15T/gcc-7-7.2.0/build/sh4-linux-gnu/m4-nofpu/libgo#
Hence "../libbacktrace/libbacktrace.la" is not found when m4-fpu/libgo/libgo.la
is being linked.
Is there a way to disable libgo for m4-fpu?
>From gcc-bugs-return-584765-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 08:04:17 2017
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From: "glaubitz at physik dot fu-berlin.de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug go/83308] Missing platform definitions for SH in libgo
Date: Mon, 11 Dec 2017 08:04:00 -0000
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--- Comment #10 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
Oh, and it seems the function signature for ioctl is wrong:
./libtool: line 1143: warning: setlocale: LC_ALL: cannot change locale
(en_US.UTF-8)
../../../src/libgo/go/exp/terminal/util.go:70:23: error: integer constant
overflow
if ioctl(fd, syscall.TIOCGWINSZ, unsafe.Pointer(&dimensions)) < 0 {
^
Makefile:3342: recipe for target 'exp/terminal.lo' failed
Changing the second parameter to 'uint' fixes this issue:
//extern ioctl
func ioctl(int, uint, unsafe.Pointer) int
which also matches what "man ioctl" says:
SYNOPSIS
#include <sys/ioctl.h>
int ioctl(int fd, unsigned long request, ...);
>From gcc-bugs-return-584766-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 08:07:20 2017
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Subject: [Bug target/83334] __builtin_ms_va_copy used in function with sysv_abi is broken
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Target| |x86_64-*-* i?86-*-*
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
The summary suggests you are doing bogus things (sysv ABI varargs function
using __builtin_ms_va_copy) -> INVALID?
>From gcc-bugs-return-584767-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 08:07:32 2017
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Subject: [Bug target/83335] [8 regression][aarch64,ilp32] gcc.target/aarch64/asm-2.c ICEs since 255481
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----------------------------------------------------------------------------
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>From gcc-bugs-return-584768-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 08:16:19 2017
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Subject: [Bug tree-optimization/83336] Issues with displaying inlining chain for middle-end warnings
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Elsewhere dwarf people were complaining about a non 1:1 match of the scope tree
of abstract and concrete instances as well which would suggest to never prune
any BLOCKs...
Note the artificial inline BLOCK might be not too excessive to preserve. OTOH
for testcases like tramp3d we have about 10 function calls per final emitted
assembly statement. That is, for heavily abstracted C++ code not pruning
BLOCKs
might cause an excessive increase in memory usage.
Shrinking tree_block might be a good idea - obvious candidates are
abstract_flag/block_num (re-use tree_base u.? but likely lang-flags are
used...)
and of course fragment_origin/chain which is only used during very late RTL.
Eventually move that offline into sth also containing the die member (similar
lifetime). The distinction between VARS and nonlocalized_vars is also
not really necessary if we get rid of the BLOCK_VARS chaining via DECL_CHAIN
and instead use the vec approach for all of them.
That said, WPA stage should no longer stream all BLOCK trees (double-check
that),
so the LTO argument might be moot but the general argument still valid (see the
tramp3d example or possibly any of the weird boost template metaprogramming
examples).
>From gcc-bugs-return-584769-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 08:20:50 2017
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Subject: [Bug lto/83338] [8 Regression] SPEC CPU2017 510.parest_r ICE
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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CC| |rguenth at gcc dot gnu.org
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--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Andrey, please report back on the status after the commit.
>From gcc-bugs-return-584770-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 08:21:37 2017
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Subject: [Bug libquadmath/83341] [8 Regression] r254899 causes about 15000 test failures on powerpc
Date: Mon, 11 Dec 2017 08:21:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Component|other |libquadmath
Version|unknown |8.0
Target Milestone|--- |8.0
Summary|r254899 causes about 15000 |[8 Regression] r254899
|test failures on powerpc |causes about 15000 test
| |failures on powerpc
>From gcc-bugs-return-584771-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 08:25:55 2017
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Subject: [Bug fortran/80645] FAIL: gfortran.dg/elemental_subroutine_3.f90 -O1 (test for excess errors)
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
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--- Comment #11 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Yes, this is valid.
>From gcc-bugs-return-584772-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 08:31:06 2017
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From: "zenith432 at users dot sourceforge.net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/83334] __builtin_ms_va_copy used in function with sysv_abi is broken
Date: Mon, 11 Dec 2017 08:31:00 -0000
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--- Comment #2 from zenith432 at users dot sourceforge.net ---
You're misquoting my summary. It does not say sysv ABI varargs function. It
says sys ABI function. Check the samples. A __builtin_ms_va_list is
constructed (__builtin_ms_va_started) in an ms ABI varargs function, then
passed as an argument to a sysv ABI function. sysv ABI functions can already
iterate over __builtin_ms_va_lists today with __builtin_va_arg. But using
__builtin_ms_va_copy on a __builtin_ms_va_list in a sysv ABI function (that got
one passed in as a parameter) emits incorrect code.
These features are all non-standard and undocumented, so it is difficult to
separate a "bug report" from a "feature request". A __builtin_ms_va_list is a
char*, and calling __builtin_ms_va_copy on it is just to assign the pointer to
another pointer. It is the same complexity as passing it as an argument. On
the other hand, iterating over a __builtin_ms_va_list (with __builtin_va_arg)
emits more complicated code, and this can already be done in a sysv ABI
function. So it seems like an omission or bug that __builtin_ms_va_copy
doesn't work in a sysv ABI function.
>From gcc-bugs-return-584773-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 08:33:56 2017
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Subject: [Bug ipa/83346] inliner crash with attribute always_inline/flatten on a destructor
Date: Mon, 11 Dec 2017 08:33:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83346
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-12-11
CC| |hubicka at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
(gdb) p node->debug ()
_ZN12_GLOBAL__N_11bIiNS_12_GLOBAL__N_12acIcccEEED2Ev/1 ({anonymous}::b<int,
{anonymous}::{anonymous}::ac<char> >::~b()) @0x7ffff6db8170
Type: function definition analyzed
Visibility: prevailing_def_ironly artificial
References:
Referring:
Function {anonymous}::b<int, {anonymous}::{anonymous}::ac<char> >::~b()/1 is
inline copy in {anonymous}::ae::~ae()/6
Availability: local
First run: 0
Function flags: count: 574129753 (estimated locally) body local
Called by: {anonymous}::ae::~ae()/6 (inlined) (574129753 (estimated
locally),0.53 per call)
Calls: {anonymous}::{anonymous}::ac<e, <template-parameter-1-2>,
<template-parameter-1-3> >::~ac() [with <template-parameter-1-1> = char;
<template-parameter-1-2> = char; <template-parameter-1-3> = char]/15 (574129752
(estimated locally),0.53 per call)
so it's an inline clone. BUT ... at the start of the loop it is
_ZN12_GLOBAL__N_11bIiNS_12_GLOBAL__N_12acIcccEEED1Ev/2 ({anonymous}::b<int,
{anonymous}::{anonymous}::ac<char> >::~b()) @0x7ffff6db82e0
Type: function definition analyzed alias cpp_implicit_alias
Visibility: prevailing_def_ironly artificial
References: _ZN12_GLOBAL__N_11bIiNS_12_GLOBAL__N_12acIcccEEED2Ev/1 (alias)
Referring:
Availability: local
First run: 0
Function flags: local
Called by: {anonymous}::ae::~ae()/6 (574129753 (estimated locally),0.53 per
call)
Calls:
so I'm not sure if 'order' stays valid during flatten processing or if we're
just lucky in re-using GC memory with the inline clone.
Honza?
>From gcc-bugs-return-584774-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 08:38:11 2017
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Subject: [Bug tree-optimization/83357] [Gcc-optimization] wrong code for elements in a union pointed by two different types of global pointers
Date: Mon, 11 Dec 2017 08:38:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |jakub at gcc dot gnu.org
Resolution|--- |INVALID
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
There is UB in that code, but the bug isn't about alignment, but about
aliasing; the standard says that writing to a union member invalidates all
other union members, and while GCC and other compilers as an extension allow
that, the requirement is that the union is visible in the access path, which is
not the case here. Testcases like this would almost always kill all the type
based alias analysis optimizations. The fact that neither GCC nor clang
-fsanitize=undefined catches this is just because there is no alias analysis
sanitizer yet.
>From gcc-bugs-return-584776-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 08:44:41 2017
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83357] [Gcc-optimization] wrong code for elements in a union pointed by two different types of global pointers
Date: Mon, 11 Dec 2017 08:44:00 -0000
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--- Comment #3 from Yibiao Yang <yangyibiao at nju dot edu.cn> ---
Thank you very much.
(In reply to Jakub Jelinek from comment #2)
> There is UB in that code, but the bug isn't about alignment, but about
> aliasing; the standard says that writing to a union member invalidates all
> other union members, and while GCC and other compilers as an extension allow
> that, the requirement is that the union is visible in the access path, which
> is not the case here. Testcases like this would almost always kill all the
> type based alias analysis optimizations. The fact that neither GCC nor
> clang -fsanitize=undefined catches this is just because there is no alias
> analysis sanitizer yet.
>From gcc-bugs-return-584775-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 08:44:35 2017
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83348] Missed optimization in math expression: can be used std::pow function
Date: Mon, 11 Dec 2017 08:44:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target| |x86_64-*-* i?86-*-*
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-12-11
CC| |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
We recognize this as an integer power of 'a' and unconditionally expand that to
an (optimal) power series. We are not considering using libgccs powi or libms
pow. Actually we do, but it's
/* Provide a default value for POWI_MAX_MULTS, the maximum number of
multiplications to inline before calling the system library's pow
function. powi(x,n) requires at worst 2*bits(n)-2 multiplications,
so this default never requires calling pow, powf or powl. */
#ifndef POWI_MAX_MULTS
#define POWI_MAX_MULTS (2*HOST_BITS_PER_WIDE_INT-2)
#endif
and no target defines this. These days it should probably be a --param.
Note that for -Os you get a call to powidf2.
@defmac POWI_MAX_MULTS
If defined, this macro is interpreted as a signed integer C expression
that specifies the maximum number of floating point multiplications
that should be emitted when expanding exponentiation by an integer
constant inline. When this value is defined, exponentiation requiring
more than this number of multiplications is implemented by calling the
system library's @code{pow}, @code{powf} or @code{powl} routines.
The default value places no upper bound on the multiplication count.
@end defmac
I guess we should simply use a more reasonable default and eventually
also decide for a cut-off calling pow () instead of libgcc provided
powi. powi does
TYPE
NAME (TYPE x, int m)
{
unsigned int n = m < 0 ? -m : m;
TYPE y = n % 2 ? x : 1;
while (n >>= 1)
{
x = x * x;
if (n % 2)
y = y * x;
}
return m < 0 ? 1/y : y;
}
>From gcc-bugs-return-584777-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 08:52:03 2017
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Subject: [Bug middle-end/83349] Missed optimization in math expression: aggressive optimization with std::pow
Date: Mon, 11 Dec 2017 08:52:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-12-11
CC| |glisse at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
Component|tree-optimization |middle-end
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
IIRC we had this simplificatio in fold-const.c at some point. Eventually we
thought moving it to tree-ssa-reassoc.c. There we have
<bb 2> [local count: 1073741825]:
_1 = __builtin_pow (a_5(D), x_6(D));
reassocpow_9 = __builtin_powi (a_5(D), 4);
_7 = _1 * reassocpow_9;
which suggests we miss (mult (pow @0 @1) (powi @0 @2)) -> (pow @0 (plus @1
@2)).
And also (mult (pow @0 @1) @0) of course.
Not sure if there is anything besides FP contraction to look for validity.
>From gcc-bugs-return-584778-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 09:03:25 2017
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Subject: [Bug tree-optimization/83350] Missed optimization in math expression: missing cube of the sum formula
Date: Mon, 11 Dec 2017 09:03:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-12-11
CC| |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
We're associating it a bit but we do not know of the power identities like
(a + b)^2 = a*a + 2*a*b + b*b
eventually undistribute_ops_list could be used to implement a generic variant
as it already searches for a similar pattern to apply reverse distribution law
a*a + a*b -> a * (a + b).
Note that at some point of complexity I view such transforms as responsibility
of the programmer rather than the compiler... (this one is on the border)
>From gcc-bugs-return-584779-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 09:05:22 2017
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Subject: [Bug tree-optimization/83351] Missed optimization in math expression: sin^2(a) + cos^2(a) == 1
Date: Mon, 11 Dec 2017 09:05:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-12-11
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. But whoever writes this is maybe not interested in seeing it
optimized to 1? There are a gazillion math identities we could handle.
This one we can pattern-match in match.pd if we think it is useful.
>From gcc-bugs-return-584780-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 09:08:20 2017
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Subject: [Bug tree-optimization/83352] Missed optimization in math expression: sqrt(sqrt(a)) == pow(a, 1/4)
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target| |x86_64-*-* i?86-*-*
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Last reconfirmed| |2017-12-11
CC| |rguenth at gcc dot gnu.org
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
We have it
/* sqrt(sqrt(x)) -> pow(x,1/4). */
(simplify
(sqrts (sqrts @0))
(pows @0 { build_real (type, dconst_quarter ()); }))
but only for canonicalization, we then expand that as (sqrt (sqrt @0)) again.
What is it that it can be "compiled in faster way" to?
>From gcc-bugs-return-584781-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 09:09:19 2017
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Subject: [Bug tree-optimization/83353] Missed optimization in math expression: sin(asin(a)) == a
Date: Mon, 11 Dec 2017 09:09:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
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Last reconfirmed| |2017-12-11
CC| |rguenth at gcc dot gnu.org
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
We're missing all of those identities. Are they really useful to have in the
compiler? I doubt that... the compiler is not matlab.
>From gcc-bugs-return-584782-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 09:11:59 2017
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Subject: [Bug target/83358] [8 Regression] division not converted with Intel tuning since r253934
Date: Mon, 11 Dec 2017 09:11:00 -0000
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--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
The following fixes this particular issue:
diff --git a/gcc/config/i386/x86-tune-costs.h
b/gcc/config/i386/x86-tune-costs.h
index 312467d9788..00f1dae9085 100644
--- a/gcc/config/i386/x86-tune-costs.h
+++ b/gcc/config/i386/x86-tune-costs.h
@@ -2345,7 +2345,7 @@ struct processor_costs core_cost = {
{COSTS_N_INSNS (8), /* cost of a divide/mod for QI */
COSTS_N_INSNS (8), /* HI */
/* 8-11 */
- COSTS_N_INSNS (11), /* SI */
+ COSTS_N_INSNS (13), /* SI */
/* 24-81 */
COSTS_N_INSNS (81), /* DI */
COSTS_N_INSNS (81)}, /*
other */
Perhaps the div costs are a bit too tight in general?
>From gcc-bugs-return-584783-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 09:13:28 2017
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Subject: [Bug tree-optimization/83354] Missed optimization in math expression: pow(cbrt(x), y) == pow(x, y / 3)
Date: Mon, 11 Dec 2017 09:13:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
We have that:
(simplify
(pows (cbrts tree_expr_nonnegative_p@0) @1)
(pows @0 (mult @1 { build_real_truncate (type, dconst_third ()); })))
the constraint is that we have to know x is not negative. If you
write pow(cbrt(fabs(x)), y) you'll see.
So WORKSFORME?
>From gcc-bugs-return-584784-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 09:14:49 2017
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Subject: [Bug tree-optimization/83359] [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2362
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2017-12-11
CC| |amker at gcc dot gnu.org
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
ISTR a duplicate but I will investigate a bit.
>From gcc-bugs-return-584785-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 09:15:46 2017
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Subject: [Bug target/83358] [8 Regression] division not converted with Intel tuning since r253934
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>From gcc-bugs-return-584786-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 09:16:11 2017
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Subject: [Bug sanitizer/83356] [7 regression] excessive stack usage compiling with -O2 -fsanitize=bounds -fsanitize=object-size
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>From gcc-bugs-return-584787-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 09:17:07 2017
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Subject: [Bug gcov-profile/83355] autofdo g++.dg/bprob/g++-bprob-1.C FAILS with ICE
Date: Mon, 11 Dec 2017 09:17:00 -0000
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Happens as a "feature" ;) See other walkers of abstract origin.
Patch is ok as obvious btw.
>From gcc-bugs-return-584788-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 09:23:24 2017
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Subject: [Bug tree-optimization/83359] [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2362
Date: Mon, 11 Dec 2017 09:23:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Both loops guarded by the IFN are parallelized with the loop noted by
the IFN outlined and the autopar scalar copy being a new loop.
Not sure what to do best, eventually not processing those loops with
GRAPHITE/autopar and/or being more rigid in throwing it away. In theory
expanding the IFN as just its arg is valid.
>From gcc-bugs-return-584789-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 09:49:15 2017
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From: "amker at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83337] [8 Regression] ICE at -O3 x86_64-linux-gnu: in interpret_rhs_expr, at tree-scalar-evolution.c:1775
Date: Mon, 11 Dec 2017 09:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83337
--- Comment #4 from amker at gcc dot gnu.org ---
Thanks Jakub for fixing the issue instantly.
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Subject: [Bug tree-optimization/78692] [7 Regression] ICE (segfault)
Date: Mon, 11 Dec 2017 09:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78692
--- Comment #6 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
Author: tschwinge
Date: Mon Dec 11 09:49:25 2017
New Revision: 255538
URL: https://gcc.gnu.org/viewcvs?rev=255538&root=gcc&view=rev
Log:
[PR c++/83301] cgraph.c segfault
Backport trunk r243377:
gcc/
2016-12-07 Jakub Jelinek <jakub@redhat.com>
PR c++/78692
* cgraph.c (cgraph_edge::redirect_call_stmt_to_callee): Set lhs
var to lhs of new_stmt right before noreturn handling rather than to
lhs of e->call_stmt early.
gcc/testsuite/
2016-12-07 Jakub Jelinek <jakub@redhat.com>
PR c++/78692
* g++.dg/torture/pr78692.C: New test.
Added:
branches/gcc-6-branch/gcc/testsuite/g++.dg/torture/pr78692.C
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/cgraph.c
branches/gcc-6-branch/gcc/testsuite/ChangeLog
>From gcc-bugs-return-584791-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 09:51:36 2017
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Subject: [Bug tree-optimization/83359] [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2362
Date: Mon, 11 Dec 2017 09:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83359
--- Comment #3 from amker at gcc dot gnu.org ---
(In reply to Richard Biener from comment #2)
> Both loops guarded by the IFN are parallelized with the loop noted by
> the IFN outlined and the autopar scalar copy being a new loop.
>
> Not sure what to do best, eventually not processing those loops with
> GRAPHITE/autopar and/or being more rigid in throwing it away. In theory
> expanding the IFN as just its arg is valid.
In current logic, we only keep distribution if it enables vectorization, one
possible fix is we also keep it if parallelization is enabled. That is,
resolve IFN_DIST call and keep the distribution in parallelization. Does this
make sense?
>From gcc-bugs-return-584792-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 09:53:18 2017
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Subject: [Bug c++/83301] [6 Regression] cgraph.c segfault
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Thomas Schwinge <tschwinge at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #7 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
Backported trunk r243377 in gcc-6-branch r255538.
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Subject: Re: [PATCH] Fix Bug 83237 - Values returned by std::poisson_distribution are not distributed correctly
To: Michele Pezzutti <mpezz@tiscali.it>, gcc-bugs@gcc.gnu.org, gcc-patches@gcc.gnu.org, libstdc++@gcc.gnu.org
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Hi,
On 10/12/2017 14:47, Michele Pezzutti wrote:
> Hi.
>
> This patch intends to fix Bug 83237 - Values returned by
> std::poisson_distribution are not distributed correctly.
> See https://gcc.gnu.org/bugzilla/show_bug.cgi?idƒ237for issue
> description and tests.
In any case, the fix should come with a testcase, which would also
validate the analysis. For this discrete distribution should be pretty
easy to add one, because all the infrastructure is already in place,
essentially three lines added to
26_numerics/random/poisson_distribution/operators/values.cc.
Paolo.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/83351] Missed optimization in math expression: sin^2(a) + cos^2(a) == 1
2017-12-10 13:48 [Bug tree-optimization/83351] New: Missed optimization in math expression: sin^2(a) + cos^2(a) == 1 zamazan4ik at tut dot by
@ 2021-12-15 21:57 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-12-15 21:57 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83351
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
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