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* [Bug rtl-optimization/57321] New: static function call miscompiled at -Os and above
@ 2013-05-17 22:35 dhazeghi at yahoo dot com
2013-05-18 11:48 ` [Bug rtl-optimization/57321] " mikpe at it dot uu.se
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: dhazeghi at yahoo dot com @ 2013-05-17 22:35 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57321
Bug ID: 57321
Summary: static function call miscompiled at -Os and above
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: dhazeghi at yahoo dot com
The testcase below is miscompiled by gcc 4.8 on x86_64-linux, resulting in a
segfault when built with -Os or higher optimization levels. This does not
occur with gcc 4.7 or current trunk. The segfault appears on line 8, where p
is dereferenced and compared.
$ gcc-4.8 -v
gcc version 4.8.0 (GCC)
$ gcc-4.8 -O1 small.c
$ ./a.out
$ gcc-4.7 -Os small.c
$ ./a.out
$ gcc-4.8 -Os small.c
$ ./a.out
Segmentation fault (core dumped)
------------------------
int a = 1;
int *b;
int **c;
static int
bar(int *p)
{
if (*p == a)
{
int *i[7][1][9] = {{{ 0 }}};
int **j[1][1][1];
j[0][0][0] = &i[0][0][0] ;
*b = &p != c;
}
return 0;
}
void
foo(int p, int q)
{
int i = 0;
if (bar (&i))
;
}
int
main()
{
foo (0, 0);
return 0;
}
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug rtl-optimization/57321] static function call miscompiled at -Os and above
2013-05-17 22:35 [Bug rtl-optimization/57321] New: static function call miscompiled at -Os and above dhazeghi at yahoo dot com
@ 2013-05-18 11:48 ` mikpe at it dot uu.se
2013-05-21 7:26 ` [Bug rtl-optimization/57321] [4.8/4.9 Regression] " jakub at gcc dot gnu.org
2013-05-21 8:00 ` [Bug tree-optimization/57321] " jakub at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: mikpe at it dot uu.se @ 2013-05-18 11:48 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57321
--- Comment #1 from Mikael Pettersson <mikpe at it dot uu.se> ---
I can reproduce the wrong-code. It was fixed on 4.8 branch by r198737 aka
PR56988.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug rtl-optimization/57321] [4.8/4.9 Regression] static function call miscompiled at -Os and above
2013-05-17 22:35 [Bug rtl-optimization/57321] New: static function call miscompiled at -Os and above dhazeghi at yahoo dot com
2013-05-18 11:48 ` [Bug rtl-optimization/57321] " mikpe at it dot uu.se
@ 2013-05-21 7:26 ` jakub at gcc dot gnu.org
2013-05-21 8:00 ` [Bug tree-optimization/57321] " jakub at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-05-21 7:26 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57321
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |jakub at gcc dot gnu.org
Resolution|--- |FIXED
Target Milestone|--- |4.8.1
Summary|static function call |[4.8/4.9 Regression] static
|miscompiled at -Os and |function call miscompiled
|above |at -Os and above
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Confirmed. Introduced with r193298, fixed on the trunk with r198540 and on the
branch with r198737.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/57321] [4.8/4.9 Regression] static function call miscompiled at -Os and above
2013-05-17 22:35 [Bug rtl-optimization/57321] New: static function call miscompiled at -Os and above dhazeghi at yahoo dot com
2013-05-18 11:48 ` [Bug rtl-optimization/57321] " mikpe at it dot uu.se
2013-05-21 7:26 ` [Bug rtl-optimization/57321] [4.8/4.9 Regression] " jakub at gcc dot gnu.org
@ 2013-05-21 8:00 ` jakub at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-05-21 8:00 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57321
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|rtl-optimization |tree-optimization
Resolution|FIXED |DUPLICATE
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue May 21 07:51:59 2013
New Revision: 199133
URL: http://gcc.gnu.org/viewcvs?rev=199133&root=gcc&view=rev
Log:
PR tree-optimization/57321
* gcc.c-torture/execute/pr57321.c: New test.
Added:
trunk/gcc/testsuite/gcc.c-torture/execute/pr57321.c
Modified:
trunk/gcc/testsuite/ChangeLog
Author: jakub
Date: Tue May 21 07:58:10 2013
New Revision: 199134
URL: http://gcc.gnu.org/viewcvs?rev=199134&root=gcc&view=rev
Log:
PR tree-optimization/57321
* gcc.c-torture/execute/pr57321.c: New test.
Added:
branches/gcc-4_8-branch/gcc/testsuite/gcc.c-torture/execute/pr57321.c
Modified:
branches/gcc-4_8-branch/gcc/testsuite/ChangeLog
*** This bug has been marked as a duplicate of bug 56988 ***
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2013-05-21 8:00 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-05-17 22:35 [Bug rtl-optimization/57321] New: static function call miscompiled at -Os and above dhazeghi at yahoo dot com
2013-05-18 11:48 ` [Bug rtl-optimization/57321] " mikpe at it dot uu.se
2013-05-21 7:26 ` [Bug rtl-optimization/57321] [4.8/4.9 Regression] " jakub at gcc dot gnu.org
2013-05-21 8:00 ` [Bug tree-optimization/57321] " jakub at gcc dot gnu.org
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