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* [Bug tree-optimization/64295] New: [5 Regression] ICE: SIGSEGV (infinite recursion) with -frounding-math -funsafe-math-optimizations
@ 2014-12-13 9:44 zsojka at seznam dot cz
2014-12-13 17:34 ` [Bug tree-optimization/64295] " jakub at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: zsojka at seznam dot cz @ 2014-12-13 9:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64295
Bug ID: 64295
Summary: [5 Regression] ICE: SIGSEGV (infinite recursion) with
-frounding-math -funsafe-math-optimizations
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
Created attachment 34273
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34273&action=edit
reduced testcase
Compiler output:
$ gcc -O -frounding-math -funsafe-math-optimizations testcase.c
gcc: internal compiler error: Segmentation fault (program cc1)
0x40c085 execute
/mnt/svn/gcc-trunk/gcc/gcc.c:2912
0x40c319 do_spec_1
/mnt/svn/gcc-trunk/gcc/gcc.c:4845
0x40e917 process_brace_body
/mnt/svn/gcc-trunk/gcc/gcc.c:6128
0x40e917 handle_braces
/mnt/svn/gcc-trunk/gcc/gcc.c:6042
0x40d317 do_spec_1
/mnt/svn/gcc-trunk/gcc/gcc.c:5499
0x40e917 process_brace_body
/mnt/svn/gcc-trunk/gcc/gcc.c:6128
0x40e917 handle_braces
/mnt/svn/gcc-trunk/gcc/gcc.c:6042
0x40d317 do_spec_1
/mnt/svn/gcc-trunk/gcc/gcc.c:5499
0x40c6a3 do_spec_1
/mnt/svn/gcc-trunk/gcc/gcc.c:5614
0x40e917 process_brace_body
/mnt/svn/gcc-trunk/gcc/gcc.c:6128
0x40e917 handle_braces
/mnt/svn/gcc-trunk/gcc/gcc.c:6042
0x40d317 do_spec_1
/mnt/svn/gcc-trunk/gcc/gcc.c:5499
0x40e917 process_brace_body
/mnt/svn/gcc-trunk/gcc/gcc.c:6128
0x40e917 handle_braces
/mnt/svn/gcc-trunk/gcc/gcc.c:6042
0x40d317 do_spec_1
/mnt/svn/gcc-trunk/gcc/gcc.c:5499
0x40e917 process_brace_body
/mnt/svn/gcc-trunk/gcc/gcc.c:6128
0x40e917 handle_braces
/mnt/svn/gcc-trunk/gcc/gcc.c:6042
0x40d317 do_spec_1
/mnt/svn/gcc-trunk/gcc/gcc.c:5499
0x40e917 process_brace_body
/mnt/svn/gcc-trunk/gcc/gcc.c:6128
0x40e917 handle_braces
/mnt/svn/gcc-trunk/gcc/gcc.c:6042
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.
Tested revisions:
r218658 - ICE
4_9 r218177 - OK
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/64295] [5 Regression] ICE: SIGSEGV (infinite recursion) with -frounding-math -funsafe-math-optimizations
2014-12-13 9:44 [Bug tree-optimization/64295] New: [5 Regression] ICE: SIGSEGV (infinite recursion) with -frounding-math -funsafe-math-optimizations zsojka at seznam dot cz
@ 2014-12-13 17:34 ` jakub at gcc dot gnu.org
2014-12-15 9:00 ` rguenth at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: jakub at gcc dot gnu.org @ 2014-12-13 17:34 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64295
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
Status|UNCONFIRMED |NEW
Last reconfirmed| |2014-12-13
CC| |jakub at gcc dot gnu.org
Target Milestone|--- |5.0
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r217545.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/64295] [5 Regression] ICE: SIGSEGV (infinite recursion) with -frounding-math -funsafe-math-optimizations
2014-12-13 9:44 [Bug tree-optimization/64295] New: [5 Regression] ICE: SIGSEGV (infinite recursion) with -frounding-math -funsafe-math-optimizations zsojka at seznam dot cz
2014-12-13 17:34 ` [Bug tree-optimization/64295] " jakub at gcc dot gnu.org
@ 2014-12-15 9:00 ` rguenth at gcc dot gnu.org
2014-12-15 9:21 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-12-15 9:00 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64295
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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> ---
Mine.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/64295] [5 Regression] ICE: SIGSEGV (infinite recursion) with -frounding-math -funsafe-math-optimizations
2014-12-13 9:44 [Bug tree-optimization/64295] New: [5 Regression] ICE: SIGSEGV (infinite recursion) with -frounding-math -funsafe-math-optimizations zsojka at seznam dot cz
2014-12-13 17:34 ` [Bug tree-optimization/64295] " jakub at gcc dot gnu.org
2014-12-15 9:00 ` rguenth at gcc dot gnu.org
@ 2014-12-15 9:21 ` rguenth at gcc dot gnu.org
2014-12-15 13:01 ` rguenth at gcc dot gnu.org
2014-12-15 13:02 ` rguenth at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-12-15 9:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64295
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Ok, so we're folding g / 3 -> g * (1 / 3) and then applyign the same transform
to 1 / 3 (because that's not constant folded with -frounding-math). I believe
the option combination is a red herring, but ...
The original fold-const.c code only transformed this if 1 / 3 constant folded
but I used fold_binary in the pattern (because const_binop wasn't available
at the point of writing it).
Testing a patch.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/64295] [5 Regression] ICE: SIGSEGV (infinite recursion) with -frounding-math -funsafe-math-optimizations
2014-12-13 9:44 [Bug tree-optimization/64295] New: [5 Regression] ICE: SIGSEGV (infinite recursion) with -frounding-math -funsafe-math-optimizations zsojka at seznam dot cz
` (2 preceding siblings ...)
2014-12-15 9:21 ` rguenth at gcc dot gnu.org
@ 2014-12-15 13:01 ` rguenth at gcc dot gnu.org
2014-12-15 13:02 ` rguenth at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-12-15 13:01 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64295
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.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/64295] [5 Regression] ICE: SIGSEGV (infinite recursion) with -frounding-math -funsafe-math-optimizations
2014-12-13 9:44 [Bug tree-optimization/64295] New: [5 Regression] ICE: SIGSEGV (infinite recursion) with -frounding-math -funsafe-math-optimizations zsojka at seznam dot cz
` (3 preceding siblings ...)
2014-12-15 13:01 ` rguenth at gcc dot gnu.org
@ 2014-12-15 13:02 ` rguenth at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-12-15 13:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64295
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Dec 15 13:01:47 2014
New Revision: 218748
URL: https://gcc.gnu.org/viewcvs?rev=218748&root=gcc&view=rev
Log:
2014-12-15 Richard Biener <rguenther@suse.de>
PR middle-end/64295
* match.pd (X / CST -> X * (1 / CST): Use const_binop instead of
fold_binary to compute the constant to multiply with.
* gcc.dg/pr64295.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/pr64295.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/match.pd
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 6+ messages in thread
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2014-12-13 9:44 [Bug tree-optimization/64295] New: [5 Regression] ICE: SIGSEGV (infinite recursion) with -frounding-math -funsafe-math-optimizations zsojka at seznam dot cz
2014-12-13 17:34 ` [Bug tree-optimization/64295] " jakub at gcc dot gnu.org
2014-12-15 9:00 ` rguenth at gcc dot gnu.org
2014-12-15 9:21 ` rguenth at gcc dot gnu.org
2014-12-15 13:01 ` rguenth at gcc dot gnu.org
2014-12-15 13:02 ` rguenth at gcc dot gnu.org
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