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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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