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* [Bug tree-optimization/103615] New: [8/9 Regression] wrong code with "-O3" or "-O1 -ftree-vectorize" on x86_64-pc-linux-gnu
@ 2021-12-08 9:15 siarhei.siamashka at gmail dot com
2021-12-08 9:17 ` [Bug tree-optimization/103615] " pinskia at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: siarhei.siamashka at gmail dot com @ 2021-12-08 9:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103615
Bug ID: 103615
Summary: [8/9 Regression] wrong code with "-O3" or "-O1
-ftree-vectorize" on x86_64-pc-linux-gnu
Product: gcc
Version: 9.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: siarhei.siamashka at gmail dot com
Target Milestone: ---
A reduced testcase from https://codeforces.com/blog/entry/97433
$ cat test.c
int z = 5;
int a[6] = {0, 0, 0, 0, 0, 1};
int main() {
for (int x = 5; x; x--)
for (int y = z; y >= x; y--)
a[y - x] += a[y];
if (a[0] != 7)
__builtin_abort ();
return 0;
}
$ gcc-7.3.0 -O3 test.c && ./a.out
$ gcc-8.3.0 -O3 test.c && ./a.out
Aborted
$ gcc-9.3.0 -O3 test.c && ./a.out
Aborted
$ gcc-9.4.1 -O3 test.c && ./a.out
Aborted
$ gcc-10.3.0 -O3 test.c && ./a.out
Only GCC versions 8.x and 9.x are affected and the bug is triggered by "-O3" or
"-O1 -ftree-vectorize" optimization option.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/103615] [8/9 Regression] wrong code with "-O3" or "-O1 -ftree-vectorize" on x86_64-pc-linux-gnu
2021-12-08 9:15 [Bug tree-optimization/103615] New: [8/9 Regression] wrong code with "-O3" or "-O1 -ftree-vectorize" on x86_64-pc-linux-gnu siarhei.siamashka at gmail dot com
@ 2021-12-08 9:17 ` pinskia at gcc dot gnu.org
2021-12-08 9:21 ` [Bug tree-optimization/103615] [9 " marxin at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-12-08 9:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103615
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.4
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/103615] [9 Regression] wrong code with "-O3" or "-O1 -ftree-vectorize" on x86_64-pc-linux-gnu
2021-12-08 9:15 [Bug tree-optimization/103615] New: [8/9 Regression] wrong code with "-O3" or "-O1 -ftree-vectorize" on x86_64-pc-linux-gnu siarhei.siamashka at gmail dot com
2021-12-08 9:17 ` [Bug tree-optimization/103615] " pinskia at gcc dot gnu.org
@ 2021-12-08 9:21 ` marxin at gcc dot gnu.org
2022-01-03 8:57 ` cvs-commit at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: marxin at gcc dot gnu.org @ 2021-12-08 9:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103615
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Keywords|needs-bisection |
Status|UNCONFIRMED |NEW
Last reconfirmed| |2021-12-08
CC| |marxin at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org,
| |rsandifo at gcc dot gnu.org
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Thanks for the report.
Using -march=core2 started with r8-5008-ga52206ae28ed3e55 and was fixed with
r10-4758-ge9acf80c96d68191.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/103615] [9 Regression] wrong code with "-O3" or "-O1 -ftree-vectorize" on x86_64-pc-linux-gnu
2021-12-08 9:15 [Bug tree-optimization/103615] New: [8/9 Regression] wrong code with "-O3" or "-O1 -ftree-vectorize" on x86_64-pc-linux-gnu siarhei.siamashka at gmail dot com
2021-12-08 9:17 ` [Bug tree-optimization/103615] " pinskia at gcc dot gnu.org
2021-12-08 9:21 ` [Bug tree-optimization/103615] [9 " marxin at gcc dot gnu.org
@ 2022-01-03 8:57 ` cvs-commit at gcc dot gnu.org
2022-01-03 12:14 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2022-01-03 8:57 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103615
--- Comment #2 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:660e5834667a9efdb4d400dfb83caa48c9dd9f9b
commit r12-6175-g660e5834667a9efdb4d400dfb83caa48c9dd9f9b
Author: Richard Biener <rguenther@suse.de>
Date: Mon Jan 3 09:56:13 2022 +0100
Add testcase for PR103615
This adds a testcase for a fixed wrong-code bug.
2022-01-03 Richard Biener <rguenther@suse.de>
PR tree-optimization/103615
* gcc.dg/torture/pr103615.c: New testcase.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/103615] [9 Regression] wrong code with "-O3" or "-O1 -ftree-vectorize" on x86_64-pc-linux-gnu
2021-12-08 9:15 [Bug tree-optimization/103615] New: [8/9 Regression] wrong code with "-O3" or "-O1 -ftree-vectorize" on x86_64-pc-linux-gnu siarhei.siamashka at gmail dot com
` (2 preceding siblings ...)
2022-01-03 8:57 ` cvs-commit at gcc dot gnu.org
@ 2022-01-03 12:14 ` rguenth at gcc dot gnu.org
2022-01-08 10:55 ` pinskia at gcc dot gnu.org
2022-05-27 9:52 ` rguenth at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-01-03 12:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103615
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/103615] [9 Regression] wrong code with "-O3" or "-O1 -ftree-vectorize" on x86_64-pc-linux-gnu
2021-12-08 9:15 [Bug tree-optimization/103615] New: [8/9 Regression] wrong code with "-O3" or "-O1 -ftree-vectorize" on x86_64-pc-linux-gnu siarhei.siamashka at gmail dot com
` (3 preceding siblings ...)
2022-01-03 12:14 ` rguenth at gcc dot gnu.org
@ 2022-01-08 10:55 ` pinskia at gcc dot gnu.org
2022-05-27 9:52 ` rguenth at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-01-08 10:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103615
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|9.4 |9.5
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/103615] [9 Regression] wrong code with "-O3" or "-O1 -ftree-vectorize" on x86_64-pc-linux-gnu
2021-12-08 9:15 [Bug tree-optimization/103615] New: [8/9 Regression] wrong code with "-O3" or "-O1 -ftree-vectorize" on x86_64-pc-linux-gnu siarhei.siamashka at gmail dot com
` (4 preceding siblings ...)
2022-01-08 10:55 ` pinskia at gcc dot gnu.org
@ 2022-05-27 9:52 ` rguenth at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-05-27 9:52 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103615
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|9.5 |10.0
Resolution|--- |FIXED
Status|NEW |RESOLVED
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed in GCC 10.
^ permalink raw reply [flat|nested] 7+ messages in thread
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2021-12-08 9:15 [Bug tree-optimization/103615] New: [8/9 Regression] wrong code with "-O3" or "-O1 -ftree-vectorize" on x86_64-pc-linux-gnu siarhei.siamashka at gmail dot com
2021-12-08 9:17 ` [Bug tree-optimization/103615] " pinskia at gcc dot gnu.org
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