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* [Bug tree-optimization/112585] New: wrong code at -O3 on x86_64-linux-gnu @ 2023-11-17 10:51 zhendong.su at inf dot ethz.ch 2023-11-17 11:11 ` [Bug tree-optimization/112585] wrong code at -O3 on x86_64-linux-gnu since r14-5444 jakub at gcc dot gnu.org ` (4 more replies) 0 siblings, 5 replies; 6+ messages in thread From: zhendong.su at inf dot ethz.ch @ 2023-11-17 10:51 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112585 Bug ID: 112585 Summary: wrong code at -O3 on x86_64-linux-gnu Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: zhendong.su at inf dot ethz.ch Target Milestone: --- This appears to be a recent regression as it does not reproduce with 13.2. Compiler Explorer: https://godbolt.org/z/ec94Yo6To [563] % gcctk -v Using built-in specs. COLLECT_GCC=gcctk COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-trunk/configure --disable-bootstrap --enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk --enable-sanitizers --enable-languages=c,c++ --disable-werror --enable-multilib Thread model: posix Supported LTO compression algorithms: zlib gcc version 14.0.0 20231117 (experimental) (GCC) [564] % [564] % gcctk -O2 small.c; ./a.out [565] % [565] % gcctk -O3 small.c [566] % ./a.out Aborted [567] % [567] % cat small.c static int a[10], b; char c, *d = &c, e; int main() { int f = 0; for (; f < 9; f++) { a[f] = 1; a[f + 1] = e; for (b = 0; b < 8; b++) *d = 0; } if (a[2] != 1) __builtin_abort(); return 0; } ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/112585] wrong code at -O3 on x86_64-linux-gnu since r14-5444 2023-11-17 10:51 [Bug tree-optimization/112585] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch @ 2023-11-17 11:11 ` jakub at gcc dot gnu.org 2023-11-17 11:15 ` rguenth at gcc dot gnu.org ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: jakub at gcc dot gnu.org @ 2023-11-17 11:11 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112585 Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Summary|wrong code at -O3 on |wrong code at -O3 on |x86_64-linux-gnu |x86_64-linux-gnu since | |r14-5444 CC| |jakub at gcc dot gnu.org, | |rguenth at gcc dot gnu.org Last reconfirmed| |2023-11-17 Target Milestone|--- |14.0 Ever confirmed|0 |1 Priority|P3 |P1 --- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Started with r14-5444-g5ea2965b499f9e491e45db19fedbccfccb75076a ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/112585] wrong code at -O3 on x86_64-linux-gnu since r14-5444 2023-11-17 10:51 [Bug tree-optimization/112585] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch 2023-11-17 11:11 ` [Bug tree-optimization/112585] wrong code at -O3 on x86_64-linux-gnu since r14-5444 jakub at gcc dot gnu.org @ 2023-11-17 11:15 ` rguenth at gcc dot gnu.org 2023-11-17 11:16 ` rguenth at gcc dot gnu.org ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: rguenth at gcc dot gnu.org @ 2023-11-17 11:15 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112585 --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- Confirmed. In .optimized all loops are unrolled and we have e.0_103 = e; _105 = (int) e.0_103; a[2] = _105; ... _7 = a[2]; if (_7 != 1) goto <bb 3>; [0.00%] else goto <bb 4>; [100.00%] <bb 3> [count: 0]: __builtin_abort (); loop distribution splits the loop, putting a loop with just a[f] = 1 first. I think that's wrong. Related to PR112281, here we have a zero distance for the inner loop. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/112585] wrong code at -O3 on x86_64-linux-gnu since r14-5444 2023-11-17 10:51 [Bug tree-optimization/112585] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch 2023-11-17 11:11 ` [Bug tree-optimization/112585] wrong code at -O3 on x86_64-linux-gnu since r14-5444 jakub at gcc dot gnu.org 2023-11-17 11:15 ` rguenth at gcc dot gnu.org @ 2023-11-17 11:16 ` rguenth at gcc dot gnu.org 2023-11-17 13:52 ` [Bug tree-optimization/112585] [14 Regression] " cvs-commit at gcc dot gnu.org 2023-11-17 13:53 ` rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: rguenth at gcc dot gnu.org @ 2023-11-17 11:16 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112585 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Blocks| |112281 Version|unknown |14.0 Status|NEW |ASSIGNED Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org --- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> --- Mine. Referenced Bugs: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112281 [Bug 112281] [12/13 Regression] wrong code at -O3 on x86_64-linux-gnu since r12-2097-g9f34b780b0461e ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/112585] [14 Regression] wrong code at -O3 on x86_64-linux-gnu since r14-5444 2023-11-17 10:51 [Bug tree-optimization/112585] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch ` (2 preceding siblings ...) 2023-11-17 11:16 ` rguenth at gcc dot gnu.org @ 2023-11-17 13:52 ` cvs-commit at gcc dot gnu.org 2023-11-17 13:53 ` rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2023-11-17 13:52 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112585 --- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>: https://gcc.gnu.org/g:04abafe9831f6867af1211ecae853ff373235b2d commit r14-5555-g04abafe9831f6867af1211ecae853ff373235b2d Author: Richard Biener <rguenther@suse.de> Date: Fri Nov 17 14:49:06 2023 +0100 tree-optimization/112585 - new testcase The offending commit r14-5444-g5ea2965b499f9e was reverted. The following adds a testcase. PR tree-optimization/112585 * gcc.dg/torture/pr112585.c: New testcase. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/112585] [14 Regression] wrong code at -O3 on x86_64-linux-gnu since r14-5444 2023-11-17 10:51 [Bug tree-optimization/112585] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch ` (3 preceding siblings ...) 2023-11-17 13:52 ` [Bug tree-optimization/112585] [14 Regression] " cvs-commit at gcc dot gnu.org @ 2023-11-17 13:53 ` rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: rguenth at gcc dot gnu.org @ 2023-11-17 13:53 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112585 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED --- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> --- Fixed. r14-5444-g5ea2965b499f9e reverted. ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2023-11-17 13:53 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2023-11-17 10:51 [Bug tree-optimization/112585] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch 2023-11-17 11:11 ` [Bug tree-optimization/112585] wrong code at -O3 on x86_64-linux-gnu since r14-5444 jakub at gcc dot gnu.org 2023-11-17 11:15 ` rguenth at gcc dot gnu.org 2023-11-17 11:16 ` rguenth at gcc dot gnu.org 2023-11-17 13:52 ` [Bug tree-optimization/112585] [14 Regression] " cvs-commit at gcc dot gnu.org 2023-11-17 13:53 ` rguenth at gcc dot gnu.org
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