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* [Bug tree-optimization/67947] New: wrong code at -O3 on x86_64-linux-gnu
@ 2015-10-13 1:10 su at cs dot ucdavis.edu
2015-10-13 9:24 ` [Bug tree-optimization/67947] [6 Regression] " rguenth at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: su at cs dot ucdavis.edu @ 2015-10-13 1:10 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67947
Bug ID: 67947
Summary: wrong code at -O3 on x86_64-linux-gnu
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
Target Milestone: ---
The current gcc trunk miscompiles the following code on x86_64-linux-gnu at -O3
in both 32-bit and 64-bit modes.
This is a regression from 5.2.x.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-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 20151012 (experimental) [trunk revision 228712] (GCC)
$
$ gcc-trunk -O2 small.c; ./a.out
0
0
0
$ gcc-5.2 -O3 small.c; ./a.out
0
0
0
$
$ gcc-trunk -O3 small.c
$ ./a.out
$
----------------------------------
int printf (const char *, ...);
int a;
int
main (int argc, char* argv[])
{
int j, k, b = 0;
if (argc == 0)
b = 1;
for (j = 0; j < 3; j++)
for (k = 0; k < 1; k++)
{
printf ("%d\n", 0);
if (b)
for (k = -1; a;)
;
}
return 0;
}
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/67947] [6 Regression] wrong code at -O3 on x86_64-linux-gnu
2015-10-13 1:10 [Bug tree-optimization/67947] New: wrong code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
@ 2015-10-13 9:24 ` rguenth at gcc dot gnu.org
2015-10-13 13:13 ` ysrumyan at gmail dot com
2015-10-20 9:19 ` mpolacek at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-10-13 9:24 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67947
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |6.0
Summary|wrong code at -O3 on |[6 Regression] wrong code
|x86_64-linux-gnu |at -O3 on x86_64-linux-gnu
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/67947] [6 Regression] wrong code at -O3 on x86_64-linux-gnu
2015-10-13 1:10 [Bug tree-optimization/67947] New: wrong code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-10-13 9:24 ` [Bug tree-optimization/67947] [6 Regression] " rguenth at gcc dot gnu.org
@ 2015-10-13 13:13 ` ysrumyan at gmail dot com
2015-10-20 9:19 ` mpolacek at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: ysrumyan at gmail dot com @ 2015-10-13 13:13 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67947
--- Comment #2 from Yuri Rumyantsev <ysrumyan at gmail dot com> ---
revision 228760 must fix this bug.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/67947] [6 Regression] wrong code at -O3 on x86_64-linux-gnu
2015-10-13 1:10 [Bug tree-optimization/67947] New: wrong code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-10-13 9:24 ` [Bug tree-optimization/67947] [6 Regression] " rguenth at gcc dot gnu.org
2015-10-13 13:13 ` ysrumyan at gmail dot com
@ 2015-10-20 9:19 ` mpolacek at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2015-10-20 9:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67947
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Assuming fixed then.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2015-10-20 9:19 UTC | newest]
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2015-10-13 1:10 [Bug tree-optimization/67947] New: wrong code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-10-13 9:24 ` [Bug tree-optimization/67947] [6 Regression] " rguenth at gcc dot gnu.org
2015-10-13 13:13 ` ysrumyan at gmail dot com
2015-10-20 9:19 ` mpolacek at gcc dot gnu.org
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