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* [Bug ipa/60072] New: wrong code (for code with an optimize attribute) at -O0 on x86_64-linux-gnu in 32-bit mode
@ 2014-02-05 8:55 su at cs dot ucdavis.edu
2014-02-05 9:17 ` [Bug ipa/60072] " jakub at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: su at cs dot ucdavis.edu @ 2014-02-05 8:55 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60072
Bug ID: 60072
Summary: wrong code (for code with an optimize attribute) at
-O0 on x86_64-linux-gnu in 32-bit mode
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ipa
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
The current gcc trunk (as well as all earlier versions from 4.6.x to 4.8.x)
miscompiles the following code with an optimize attribute on x86_64-linux at
-O0 in 32-bit mode (but not 64-bit).
$ 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/4.9.0/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 4.9.0 20140204 (experimental) [trunk revision 207486] (GCC)
$
$ gcc-trunk -m32 -O1 small.c; a.out
$ gcc-trunk -m64 -O0 small.c; a.out
$
$ gcc-trunk -m32 -O0 small.c; a.out
Segmentation fault (core dumped)
$ gcc-4.8.2 -m32 -O0 small.c; a.out
Segmentation fault (core dumped)
$ gcc-4.7.3 -m32 -O0 small.c; a.out
Segmentation fault (core dumped)
$ gcc-4.6.4 -m32 -O0 small.c; a.out
Segmentation fault (core dumped)
$
-----------------------------------
int i, *a = &i, **b = &a, c, d, **e = &a;
__attribute__ ((optimize (1)))
static int *foo (int *p)
{
*e = p;
return 0;
}
int
main ()
{
foo (&c);
d < 1 && **b;
return 0;
}
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug ipa/60072] wrong code (for code with an optimize attribute) at -O0 on x86_64-linux-gnu in 32-bit mode
2014-02-05 8:55 [Bug ipa/60072] New: wrong code (for code with an optimize attribute) at -O0 on x86_64-linux-gnu in 32-bit mode su at cs dot ucdavis.edu
@ 2014-02-05 9:17 ` jakub at gcc dot gnu.org
2014-02-05 15:31 ` su at cs dot ucdavis.edu
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: jakub at gcc dot gnu.org @ 2014-02-05 9:17 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60072
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |jakub at gcc dot gnu.org
Resolution|--- |DUPLICATE
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Seems to be a dup of PR60062.
*** This bug has been marked as a duplicate of bug 60062 ***
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug ipa/60072] wrong code (for code with an optimize attribute) at -O0 on x86_64-linux-gnu in 32-bit mode
2014-02-05 8:55 [Bug ipa/60072] New: wrong code (for code with an optimize attribute) at -O0 on x86_64-linux-gnu in 32-bit mode su at cs dot ucdavis.edu
2014-02-05 9:17 ` [Bug ipa/60072] " jakub at gcc dot gnu.org
@ 2014-02-05 15:31 ` su at cs dot ucdavis.edu
2014-02-05 16:14 ` jakub at gcc dot gnu.org
2014-02-05 20:37 ` su at cs dot ucdavis.edu
3 siblings, 0 replies; 5+ messages in thread
From: su at cs dot ucdavis.edu @ 2014-02-05 15:31 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60072
--- Comment #2 from Zhendong Su <su at cs dot ucdavis.edu> ---
(In reply to Jakub Jelinek from comment #1)
> Seems to be a dup of PR60062.
>
> *** This bug has been marked as a duplicate of bug 60062 ***
Sorry for the dup Jakub, but are you certain about it? Since 60062 also
affects 4.8.x, but this one doesn't, so I went and filed this report.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug ipa/60072] wrong code (for code with an optimize attribute) at -O0 on x86_64-linux-gnu in 32-bit mode
2014-02-05 8:55 [Bug ipa/60072] New: wrong code (for code with an optimize attribute) at -O0 on x86_64-linux-gnu in 32-bit mode su at cs dot ucdavis.edu
2014-02-05 9:17 ` [Bug ipa/60072] " jakub at gcc dot gnu.org
2014-02-05 15:31 ` su at cs dot ucdavis.edu
@ 2014-02-05 16:14 ` jakub at gcc dot gnu.org
2014-02-05 20:37 ` su at cs dot ucdavis.edu
3 siblings, 0 replies; 5+ messages in thread
From: jakub at gcc dot gnu.org @ 2014-02-05 16:14 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60072
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
It is fixed by the same patch, and is the same problem. If one of the two PRs
ever worked with optimize attribute, it was purely by accident.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug ipa/60072] wrong code (for code with an optimize attribute) at -O0 on x86_64-linux-gnu in 32-bit mode
2014-02-05 8:55 [Bug ipa/60072] New: wrong code (for code with an optimize attribute) at -O0 on x86_64-linux-gnu in 32-bit mode su at cs dot ucdavis.edu
` (2 preceding siblings ...)
2014-02-05 16:14 ` jakub at gcc dot gnu.org
@ 2014-02-05 20:37 ` su at cs dot ucdavis.edu
3 siblings, 0 replies; 5+ messages in thread
From: su at cs dot ucdavis.edu @ 2014-02-05 20:37 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60072
--- Comment #4 from Zhendong Su <su at cs dot ucdavis.edu> ---
(In reply to Jakub Jelinek from comment #3)
> It is fixed by the same patch, and is the same problem. If one of the two
> PRs ever worked with optimize attribute, it was purely by accident.
Okay, thanks Jakub!
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2014-02-05 20:37 UTC | newest]
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2014-02-05 8:55 [Bug ipa/60072] New: wrong code (for code with an optimize attribute) at -O0 on x86_64-linux-gnu in 32-bit mode su at cs dot ucdavis.edu
2014-02-05 9:17 ` [Bug ipa/60072] " jakub at gcc dot gnu.org
2014-02-05 15:31 ` su at cs dot ucdavis.edu
2014-02-05 16:14 ` jakub at gcc dot gnu.org
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