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* [Bug tree-optimization/64957] New: wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu
@ 2015-02-06 6:18 su at cs dot ucdavis.edu
2015-02-06 8:42 ` [Bug tree-optimization/64957] [5 Regression] " jakub at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: su at cs dot ucdavis.edu @ 2015-02-06 6:18 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64957
Bug ID: 64957
Summary: wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
The current gcc trunk miscompiles the following code on x86_64-linux at -O1,
-O2 and -O3 in both 32-bit and 64-bit modes.
This is a regression from 4.9.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/5.0.0/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 5.0.0 20150205 (experimental) [trunk revision 220434] (GCC)
$
$ gcc-trunk -O0 small.c; a.out
$ gcc-4.9 -O1 small.c; a.out
$
$ gcc-trunk -O1 small.c
$ ./a.out
Aborted (core dumped)
$
--------------------------
int a, b;
int
main ()
{
a = 0;
for (; a < 2; a++)
{
b ^= 5;
b |= 1;
}
if (b != 1)
__builtin_abort ();
return 0;
}
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/64957] [5 Regression] wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu
2015-02-06 6:18 [Bug tree-optimization/64957] New: wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
@ 2015-02-06 8:42 ` jakub at gcc dot gnu.org
2015-02-06 8:47 ` [Bug rtl-optimization/64957] " jakub at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-02-06 8:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64957
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2015-02-06
CC| |jakub at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
Target Milestone|--- |5.0
Summary|wrong code at -O1, -O2 and |[5 Regression] wrong code
|-O3 on x86_64-linux-gnu |at -O1, -O2 and -O3 on
| |x86_64-linux-gnu
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Caused by r220405. Will test the obvious fix.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug rtl-optimization/64957] [5 Regression] wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu
2015-02-06 6:18 [Bug tree-optimization/64957] New: wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-02-06 8:42 ` [Bug tree-optimization/64957] [5 Regression] " jakub at gcc dot gnu.org
@ 2015-02-06 8:47 ` jakub at gcc dot gnu.org
2015-02-06 9:15 ` jakub at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-02-06 8:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64957
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 34682
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34682&action=edit
gcc5-pr64957.patch
Untested fix.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug rtl-optimization/64957] [5 Regression] wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu
2015-02-06 6:18 [Bug tree-optimization/64957] New: wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-02-06 8:42 ` [Bug tree-optimization/64957] [5 Regression] " jakub at gcc dot gnu.org
2015-02-06 8:47 ` [Bug rtl-optimization/64957] " jakub at gcc dot gnu.org
@ 2015-02-06 9:15 ` jakub at gcc dot gnu.org
2015-02-06 11:37 ` jakub at gcc dot gnu.org
2015-02-06 16:17 ` jakub at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-02-06 9:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64957
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug rtl-optimization/64957] [5 Regression] wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu
2015-02-06 6:18 [Bug tree-optimization/64957] New: wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
` (2 preceding siblings ...)
2015-02-06 9:15 ` jakub at gcc dot gnu.org
@ 2015-02-06 11:37 ` jakub at gcc dot gnu.org
2015-02-06 16:17 ` jakub at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-02-06 11:37 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64957
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Feb 6 11:36:34 2015
New Revision: 220475
URL: https://gcc.gnu.org/viewcvs?rev=220475&root=gcc&view=rev
Log:
PR rtl-optimization/64957
PR debug/64817
* simplify-rtx.c (simplify_binary_operation_1): Use ~cval for
IOR rather than for AND.
* gcc.c-torture/execute/pr64957.c: New test.
Added:
trunk/gcc/testsuite/gcc.c-torture/execute/pr64957.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/simplify-rtx.c
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug rtl-optimization/64957] [5 Regression] wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu
2015-02-06 6:18 [Bug tree-optimization/64957] New: wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
` (3 preceding siblings ...)
2015-02-06 11:37 ` jakub at gcc dot gnu.org
@ 2015-02-06 16:17 ` jakub at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-02-06 16:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64957
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 6+ messages in thread
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2015-02-06 6:18 [Bug tree-optimization/64957] New: wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-02-06 8:42 ` [Bug tree-optimization/64957] [5 Regression] " jakub at gcc dot gnu.org
2015-02-06 8:47 ` [Bug rtl-optimization/64957] " jakub at gcc dot gnu.org
2015-02-06 9:15 ` jakub at gcc dot gnu.org
2015-02-06 11:37 ` jakub at gcc dot gnu.org
2015-02-06 16:17 ` jakub at gcc dot gnu.org
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