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* [Bug tree-optimization/102149] New: wrong code at -O3 on x86_64-linux-gnu
@ 2021-08-31 19:38 qrzhang at gatech dot edu
2021-08-31 19:40 ` [Bug tree-optimization/102149] " qrzhang at gatech dot edu
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: qrzhang at gatech dot edu @ 2021-08-31 19:38 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102149
Bug ID: 102149
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: qrzhang at gatech dot edu
Target Milestone: ---
Seems to be a recent regression.
$ gcc-trunk -v
gcc version 12.0.0 20210831 (experimental) [master revision
5e57bacf6f3:a82c79a304b:de7a795c321e76826d123c92b99e73e144666b60] (GCC)
$ gcc-trunk abc.c ; ./a.out
1
$ gcc-trunk abc.c ; ./a.out
0
$ cat abc.c
int a[8];
int *b = &a[6];
char c;
int main() {
int d = 7;
for (; d >= 0; d--) {
*b = 1;
c = a[d] >> 3;
a[d] = c;
}
printf("%d\n", a[6]);
}
^ permalink raw reply [flat|nested] 7+ messages in thread* [Bug tree-optimization/102149] wrong code at -O3 on x86_64-linux-gnu 2021-08-31 19:38 [Bug tree-optimization/102149] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu @ 2021-08-31 19:40 ` qrzhang at gatech dot edu 2021-08-31 19:44 ` jakub at gcc dot gnu.org ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: qrzhang at gatech dot edu @ 2021-08-31 19:40 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102149 --- Comment #1 from Qirun Zhang <qrzhang at gatech dot edu> --- My bisection points to g:89f33f44addbf9853bc3e6677d ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/102149] wrong code at -O3 on x86_64-linux-gnu 2021-08-31 19:38 [Bug tree-optimization/102149] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu 2021-08-31 19:40 ` [Bug tree-optimization/102149] " qrzhang at gatech dot edu @ 2021-08-31 19:44 ` jakub at gcc dot gnu.org 2021-08-31 20:17 ` pinskia at gcc dot gnu.org ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: jakub at gcc dot gnu.org @ 2021-08-31 19:44 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102149 Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org --- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Started with r12-3222-g89f33f44addbf9853bc3e6677db1fa941713cb6c but got fixed with r12-3250-g67927342290c61d7e054430f1d7a7281f1f97fae So I think we just want to add the testcase to the testsuite and close. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/102149] wrong code at -O3 on x86_64-linux-gnu 2021-08-31 19:38 [Bug tree-optimization/102149] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu 2021-08-31 19:40 ` [Bug tree-optimization/102149] " qrzhang at gatech dot edu 2021-08-31 19:44 ` jakub at gcc dot gnu.org @ 2021-08-31 20:17 ` pinskia at gcc dot gnu.org 2021-09-01 6:05 ` rguenth at gcc dot gnu.org ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-08-31 20:17 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102149 --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #2) > Started with r12-3222-g89f33f44addbf9853bc3e6677db1fa941713cb6c > but got fixed with r12-3250-g67927342290c61d7e054430f1d7a7281f1f97fae > So I think we just want to add the testcase to the testsuite and close. That might mean -fno-vect-cost-model might be able to reproduce this still on the trunk I think. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/102149] wrong code at -O3 on x86_64-linux-gnu 2021-08-31 19:38 [Bug tree-optimization/102149] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu ` (2 preceding siblings ...) 2021-08-31 20:17 ` pinskia at gcc dot gnu.org @ 2021-09-01 6:05 ` rguenth at gcc dot gnu.org 2021-09-01 7:51 ` cvs-commit at gcc dot gnu.org 2021-09-01 7:51 ` rguenth at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: rguenth at gcc dot gnu.org @ 2021-09-01 6:05 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102149 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org Ever confirmed|0 |1 Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2021-09-01 --- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- Mine for the testcase & investigation. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/102149] wrong code at -O3 on x86_64-linux-gnu 2021-08-31 19:38 [Bug tree-optimization/102149] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu ` (3 preceding siblings ...) 2021-09-01 6:05 ` rguenth at gcc dot gnu.org @ 2021-09-01 7:51 ` cvs-commit at gcc dot gnu.org 2021-09-01 7:51 ` rguenth at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2021-09-01 7:51 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102149 --- Comment #5 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:e6bd9c42b0ad0cc4a615135612599adb829f2d9c commit r12-3279-ge6bd9c42b0ad0cc4a615135612599adb829f2d9c Author: Richard Biener <rguenther@suse.de> Date: Wed Sep 1 08:06:48 2021 +0200 tree-optimization/102149 - add testcase for fixed bug This adds the testcase from the PR. 2021-09-01 Richard Biener <rguenther@suse.de> PR tree-optimization/102149 * gcc.dg/torture/pr102149.c: New testcase. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/102149] wrong code at -O3 on x86_64-linux-gnu 2021-08-31 19:38 [Bug tree-optimization/102149] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu ` (4 preceding siblings ...) 2021-09-01 7:51 ` cvs-commit at gcc dot gnu.org @ 2021-09-01 7:51 ` rguenth at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: rguenth at gcc dot gnu.org @ 2021-09-01 7:51 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102149 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Version|unknown |12.0 Resolution|--- |FIXED Status|ASSIGNED |RESOLVED --- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> --- Fixed. ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2021-09-01 7:51 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-08-31 19:38 [Bug tree-optimization/102149] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu 2021-08-31 19:40 ` [Bug tree-optimization/102149] " qrzhang at gatech dot edu 2021-08-31 19:44 ` jakub at gcc dot gnu.org 2021-08-31 20:17 ` pinskia at gcc dot gnu.org 2021-09-01 6:05 ` rguenth at gcc dot gnu.org 2021-09-01 7:51 ` cvs-commit at gcc dot gnu.org 2021-09-01 7:51 ` rguenth at gcc dot gnu.org
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