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* [Bug tree-optimization/64260] New: wrong code at -O1 on x86_64-linux-gnu @ 2014-12-11 0:51 su at cs dot ucdavis.edu 2014-12-11 6:17 ` [Bug tree-optimization/64260] " mpolacek at gcc dot gnu.org ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: su at cs dot ucdavis.edu @ 2014-12-11 0:51 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64260 Bug ID: 64260 Summary: wrong code at -O1 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 (only) 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 20141210 (experimental) [trunk revision 218559] (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 = 1, b; void fn1 (char p) { int t = 0; for (; b < 1; b++) { int *s = &a; --t && (*s &= p); *s &= 1; } } int main () { fn1 (0); if (a != 0) __builtin_abort (); return 0; } ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/64260] wrong code at -O1 on x86_64-linux-gnu 2014-12-11 0:51 [Bug tree-optimization/64260] New: wrong code at -O1 on x86_64-linux-gnu su at cs dot ucdavis.edu @ 2014-12-11 6:17 ` mpolacek at gcc dot gnu.org 2014-12-12 12:44 ` [Bug tree-optimization/64260] [5 Regression] " jakub at gcc dot gnu.org 2015-01-05 6:38 ` Joost.VandeVondele at mat dot ethz.ch 2 siblings, 0 replies; 4+ messages in thread From: mpolacek at gcc dot gnu.org @ 2014-12-11 6:17 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64260 Marek Polacek <mpolacek at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |mpolacek at gcc dot gnu.org --- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> --- -fno-if-conversion helps, so likely a dup of PR64255 / PR63917. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/64260] [5 Regression] wrong code at -O1 on x86_64-linux-gnu 2014-12-11 0:51 [Bug tree-optimization/64260] New: wrong code at -O1 on x86_64-linux-gnu su at cs dot ucdavis.edu 2014-12-11 6:17 ` [Bug tree-optimization/64260] " mpolacek at gcc dot gnu.org @ 2014-12-12 12:44 ` jakub at gcc dot gnu.org 2015-01-05 6:38 ` Joost.VandeVondele at mat dot ethz.ch 2 siblings, 0 replies; 4+ messages in thread From: jakub at gcc dot gnu.org @ 2014-12-12 12:44 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64260 --- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Author: jakub Date: Fri Dec 12 12:43:34 2014 New Revision: 218665 URL: https://gcc.gnu.org/viewcvs?rev=218665&root=gcc&view=rev Log: PR rtl-optimization/64255 * gcc.c-torture/execute/pr64255.c: New test. PR rtl-optimization/64260 * gcc.c-torture/execute/pr64260.c: New test. Added: trunk/gcc/testsuite/gcc.c-torture/execute/pr64255.c trunk/gcc/testsuite/gcc.c-torture/execute/pr64260.c Modified: trunk/gcc/testsuite/ChangeLog ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/64260] [5 Regression] wrong code at -O1 on x86_64-linux-gnu 2014-12-11 0:51 [Bug tree-optimization/64260] New: wrong code at -O1 on x86_64-linux-gnu su at cs dot ucdavis.edu 2014-12-11 6:17 ` [Bug tree-optimization/64260] " mpolacek at gcc dot gnu.org 2014-12-12 12:44 ` [Bug tree-optimization/64260] [5 Regression] " jakub at gcc dot gnu.org @ 2015-01-05 6:38 ` Joost.VandeVondele at mat dot ethz.ch 2 siblings, 0 replies; 4+ messages in thread From: Joost.VandeVondele at mat dot ethz.ch @ 2015-01-05 6:38 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64260 Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED CC| |Joost.VandeVondele at mat dot ethz | |.ch Resolution|--- |FIXED --- Comment #4 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> --- fixed indeed. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2015-01-05 6:38 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2014-12-11 0:51 [Bug tree-optimization/64260] New: wrong code at -O1 on x86_64-linux-gnu su at cs dot ucdavis.edu 2014-12-11 6:17 ` [Bug tree-optimization/64260] " mpolacek at gcc dot gnu.org 2014-12-12 12:44 ` [Bug tree-optimization/64260] [5 Regression] " jakub at gcc dot gnu.org 2015-01-05 6:38 ` Joost.VandeVondele at mat dot ethz.ch
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