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* [Bug rtl-optimization/66757] New: wrong code at -O1 and above on x86_64-linux-gnu
@ 2015-07-03 22:11 su at cs dot ucdavis.edu
2015-07-05 12:20 ` [Bug rtl-optimization/66757] " ebotcazou at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: su at cs dot ucdavis.edu @ 2015-07-03 22:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66757
Bug ID: 66757
Summary: wrong code at -O1 and above on x86_64-linux-gnu
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
Target Milestone: ---
The current gcc trunk mis-compiles the following code on x86_64-linux-gnu at
-O1 and above in both 32-bit and 64-bit modes.
This is a regression from 5.1.x.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 6.0.0 20150703 (experimental) [trunk revision 225367] (GCC)
$
$ gcc-trunk -O0 small.c; ./a.out
$ gcc-5.1 -O1 small.c; ./a.out
$
$ gcc-trunk -O1 small.c
$ ./a.out
Aborted (core dumped)
$
------------------------------------------
int a, b;
int
main ()
{
unsigned int t = (unsigned char) (~b);
if ((t ^ 1) / 255)
__builtin_abort ();
return 0;
}
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug rtl-optimization/66757] wrong code at -O1 and above on x86_64-linux-gnu
2015-07-03 22:11 [Bug rtl-optimization/66757] New: wrong code at -O1 and above on x86_64-linux-gnu su at cs dot ucdavis.edu
@ 2015-07-05 12:20 ` ebotcazou at gcc dot gnu.org
2015-07-05 12:21 ` [Bug tree-optimization/66757] " ebotcazou at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: ebotcazou at gcc dot gnu.org @ 2015-07-05 12:20 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66757
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-07-05
CC| |ebotcazou at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Confirmed, forwprop1 going awry because of the match.pd:444 pattern.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/66757] wrong code at -O1 and above on x86_64-linux-gnu
2015-07-03 22:11 [Bug rtl-optimization/66757] New: wrong code at -O1 and above on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-07-05 12:20 ` [Bug rtl-optimization/66757] " ebotcazou at gcc dot gnu.org
@ 2015-07-05 12:21 ` ebotcazou at gcc dot gnu.org
2015-07-05 18:17 ` [Bug tree-optimization/66757] [6 Regression] " hjl.tools at gmail dot com
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: ebotcazou at gcc dot gnu.org @ 2015-07-05 12:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66757
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Component|rtl-optimization |tree-optimization
Assignee|unassigned at gcc dot gnu.org |ebotcazou at gcc dot gnu.org
--- Comment #2 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Testing obvious fix.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/66757] [6 Regression] wrong code at -O1 and above on x86_64-linux-gnu
2015-07-03 22:11 [Bug rtl-optimization/66757] New: wrong code at -O1 and above on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-07-05 12:20 ` [Bug rtl-optimization/66757] " ebotcazou at gcc dot gnu.org
2015-07-05 12:21 ` [Bug tree-optimization/66757] " ebotcazou at gcc dot gnu.org
@ 2015-07-05 18:17 ` hjl.tools at gmail dot com
2015-07-06 8:44 ` ebotcazou at gcc dot gnu.org
2015-07-06 8:48 ` ebotcazou at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: hjl.tools at gmail dot com @ 2015-07-05 18:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66757
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |6.0
Summary|wrong code at -O1 and above |[6 Regression] wrong code
|on x86_64-linux-gnu |at -O1 and above on
| |x86_64-linux-gnu
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/66757] [6 Regression] wrong code at -O1 and above on x86_64-linux-gnu
2015-07-03 22:11 [Bug rtl-optimization/66757] New: wrong code at -O1 and above on x86_64-linux-gnu su at cs dot ucdavis.edu
` (2 preceding siblings ...)
2015-07-05 18:17 ` [Bug tree-optimization/66757] [6 Regression] " hjl.tools at gmail dot com
@ 2015-07-06 8:44 ` ebotcazou at gcc dot gnu.org
2015-07-06 8:48 ` ebotcazou at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: ebotcazou at gcc dot gnu.org @ 2015-07-06 8:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66757
--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Author: ebotcazou
Date: Mon Jul 6 08:43:58 2015
New Revision: 225446
URL: https://gcc.gnu.org/viewcvs?rev=225446&root=gcc&view=rev
Log:
PR tree-optimization/66757
* match.pd: Add missing condition to ~X ^ C -> X ^ ~C.
Added:
trunk/gcc/testsuite/gcc.c-torture/execute/pr66757.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/match.pd
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/66757] [6 Regression] wrong code at -O1 and above on x86_64-linux-gnu
2015-07-03 22:11 [Bug rtl-optimization/66757] New: wrong code at -O1 and above on x86_64-linux-gnu su at cs dot ucdavis.edu
` (3 preceding siblings ...)
2015-07-06 8:44 ` ebotcazou at gcc dot gnu.org
@ 2015-07-06 8:48 ` ebotcazou at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: ebotcazou at gcc dot gnu.org @ 2015-07-06 8:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66757
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Thanks for reporting the problem.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2015-07-06 8:48 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2015-07-03 22:11 [Bug rtl-optimization/66757] New: wrong code at -O1 and above on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-07-05 12:20 ` [Bug rtl-optimization/66757] " ebotcazou at gcc dot gnu.org
2015-07-05 12:21 ` [Bug tree-optimization/66757] " ebotcazou at gcc dot gnu.org
2015-07-05 18:17 ` [Bug tree-optimization/66757] [6 Regression] " hjl.tools at gmail dot com
2015-07-06 8:44 ` ebotcazou at gcc dot gnu.org
2015-07-06 8:48 ` ebotcazou at gcc dot gnu.org
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