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* [Bug tree-optimization/101615] New: wrong code at -O3 on x86_64-linux-gnu
@ 2021-07-24 20:53 qrzhang at gatech dot edu
2021-07-24 20:53 ` [Bug tree-optimization/101615] " qrzhang at gatech dot edu
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: qrzhang at gatech dot edu @ 2021-07-24 20:53 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101615
Bug ID: 101615
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: ---
It appears to be a recent regression.
$ gcc-trunk -v
Supported LTO compression algorithms: zlib
gcc version 12.0.0 20210724 (experimental) [master revision
e314cfc371d:5eb84b79079:ead235f60139edc6eb408d8d083cbb15e417b447] (GCC)
$ gcc-trunk abc.c ; ./a.out
5
7
11
3
3
3
$ gcc-trunk -O3 abc.c ; ./a.out
5
7
3
3
3
11
$ cat abc.c
int a[50] = {5, 5, 8};
short b;
int c, d;
int main() {
int e;
for (; b <= 4; b++)
for (; c <= 4; c++) {
*a |= 1;
e = 0;
for (; e <= 4; e++)
a[e + 1] |= 3;
}
for (; d < 6; d++)
printf("%d\n", a[d]);
}
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/101615] wrong code at -O3 on x86_64-linux-gnu
2021-07-24 20:53 [Bug tree-optimization/101615] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu
@ 2021-07-24 20:53 ` qrzhang at gatech dot edu
2021-07-24 20:59 ` [Bug tree-optimization/101615] [12 Regression] wrong code at -O3 on x86_64-linux-gnu since r12-1872 pinskia at gcc dot gnu.org
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: qrzhang at gatech dot edu @ 2021-07-24 20:53 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101615
--- Comment #1 from Qirun Zhang <qrzhang at gatech dot edu> ---
My bisection points to g:6df6055d5c666e669890ff8
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/101615] [12 Regression] wrong code at -O3 on x86_64-linux-gnu since r12-1872
2021-07-24 20:53 [Bug tree-optimization/101615] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu
2021-07-24 20:53 ` [Bug tree-optimization/101615] " qrzhang at gatech dot edu
@ 2021-07-24 20:59 ` pinskia at gcc dot gnu.org
2021-07-27 10:48 ` rguenth at gcc dot gnu.org
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-07-24 20:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101615
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86_64-linux-gnu
Target Milestone|--- |12.0
Summary|wrong code at -O3 on |[12 Regression] wrong code
|x86_64-linux-gnu since |at -O3 on x86_64-linux-gnu
|r12-1872 |since r12-1872
Keywords| |wrong-code
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/101615] [12 Regression] wrong code at -O3 on x86_64-linux-gnu since r12-1872
2021-07-24 20:53 [Bug tree-optimization/101615] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu
2021-07-24 20:53 ` [Bug tree-optimization/101615] " qrzhang at gatech dot edu
2021-07-24 20:59 ` [Bug tree-optimization/101615] [12 Regression] wrong code at -O3 on x86_64-linux-gnu since r12-1872 pinskia at gcc dot gnu.org
@ 2021-07-27 10:48 ` rguenth at gcc dot gnu.org
2021-07-28 13:14 ` cvs-commit at gcc dot gnu.org
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-07-27 10:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101615
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|unknown |12.0
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Status|UNCONFIRMED |ASSIGNED
Ever confirmed|0 |1
Last reconfirmed| |2021-07-27
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
I will have a look.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/101615] [12 Regression] wrong code at -O3 on x86_64-linux-gnu since r12-1872
2021-07-24 20:53 [Bug tree-optimization/101615] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu
` (2 preceding siblings ...)
2021-07-27 10:48 ` rguenth at gcc dot gnu.org
@ 2021-07-28 13:14 ` cvs-commit at gcc dot gnu.org
2021-07-28 13:15 ` rguenth at gcc dot gnu.org
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-07-28 13:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101615
--- Comment #3 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:6bb6e2044ced33d08175361b8e39a9c5d4a868a6
commit r12-2570-g6bb6e2044ced33d08175361b8e39a9c5d4a868a6
Author: Richard Biener <rguenther@suse.de>
Date: Wed Jul 28 14:16:35 2021 +0200
tree-optimization/101615 - SLP permute opt of existing vectors
This fixes one issue discovered when analyzing PR101615, namely
we happily push permutes to pre-existing vectors but end up
not actually permuting them. In fact we don't want to, so force
materialization on the external.
It doesn't fix the original testcase though.
2021-07-28 Richard Biener <rguenther@suse.de>
PR tree-optimization/101615
* tree-vect-slp.c (vect_optimize_slp): Pre-existing vector
external nodes cannot be permuted so make them perm_out 0.
* gcc.dg/vect/bb-slp-pr101615-1.c: New testcase.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/101615] [12 Regression] wrong code at -O3 on x86_64-linux-gnu since r12-1872
2021-07-24 20:53 [Bug tree-optimization/101615] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu
` (3 preceding siblings ...)
2021-07-28 13:14 ` cvs-commit at gcc dot gnu.org
@ 2021-07-28 13:15 ` rguenth at gcc dot gnu.org
2021-07-28 15:41 ` cvs-commit at gcc dot gnu.org
` (2 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-07-28 13:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101615
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
I'm now testing the other half of the fix.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/101615] [12 Regression] wrong code at -O3 on x86_64-linux-gnu since r12-1872
2021-07-24 20:53 [Bug tree-optimization/101615] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu
` (4 preceding siblings ...)
2021-07-28 13:15 ` rguenth at gcc dot gnu.org
@ 2021-07-28 15:41 ` cvs-commit at gcc dot gnu.org
2021-07-28 15:41 ` rguenth at gcc dot gnu.org
2022-01-13 10:54 ` cvs-commit at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-07-28 15:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101615
--- 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:3c91efec15af4f922a9af495e178bbb66d2e9d1f
commit r12-2573-g3c91efec15af4f922a9af495e178bbb66d2e9d1f
Author: Richard Biener <rguenther@suse.de>
Date: Wed Jul 28 15:12:00 2021 +0200
tree-optimization/101615 - SLP permute opt with CTOR roots
CTOR roots are not explicitely represented so we have to make sure
to materialize permutes on SLP graph entries to them.
2021-07-28 Richard Biener <rguenther@suse.de>
PR tree-optimization/101615
* tree-vect-slp.c (vect_optimize_slp): Materialize permutes
at CTOR SLP graph entries.
* gcc.dg/vect/bb-slp-pr101615-2.c: New testcase.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/101615] [12 Regression] wrong code at -O3 on x86_64-linux-gnu since r12-1872
2021-07-24 20:53 [Bug tree-optimization/101615] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu
` (5 preceding siblings ...)
2021-07-28 15:41 ` cvs-commit at gcc dot gnu.org
@ 2021-07-28 15:41 ` rguenth at gcc dot gnu.org
2022-01-13 10:54 ` cvs-commit at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-07-28 15:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101615
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/101615] [12 Regression] wrong code at -O3 on x86_64-linux-gnu since r12-1872
2021-07-24 20:53 [Bug tree-optimization/101615] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu
` (6 preceding siblings ...)
2021-07-28 15:41 ` rguenth at gcc dot gnu.org
@ 2022-01-13 10:54 ` cvs-commit at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2022-01-13 10:54 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101615
--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:
https://gcc.gnu.org/g:7f49f50f756c06f4093358ff77c11152777fff1c
commit r11-9458-g7f49f50f756c06f4093358ff77c11152777fff1c
Author: Richard Biener <rguenther@suse.de>
Date: Wed Jul 28 15:12:00 2021 +0200
tree-optimization/101615 - SLP permute opt with CTOR roots
CTOR roots are not explicitely represented so we have to make sure
to materialize permutes on SLP graph entries to them.
2021-07-28 Richard Biener <rguenther@suse.de>
PR tree-optimization/101615
PR tree-optimization/103995
* tree-vect-slp.c (vect_optimize_slp): Materialize permutes
at CTOR SLP graph entries.
* gcc.dg/vect/bb-slp-pr101615-2.c: New testcase.
^ permalink raw reply [flat|nested] 9+ messages in thread
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2021-07-24 20:53 [Bug tree-optimization/101615] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu
2021-07-24 20:53 ` [Bug tree-optimization/101615] " qrzhang at gatech dot edu
2021-07-24 20:59 ` [Bug tree-optimization/101615] [12 Regression] wrong code at -O3 on x86_64-linux-gnu since r12-1872 pinskia at gcc dot gnu.org
2021-07-27 10:48 ` rguenth at gcc dot gnu.org
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