public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug c/110638] New: [13 regression] memcpy should be inlined with sve loop
@ 2023-07-12 7:42 zhongyunde at huawei dot com
2023-07-12 7:53 ` [Bug target/110638] " pinskia at gcc dot gnu.org
2023-07-12 7:55 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: zhongyunde at huawei dot com @ 2023-07-12 7:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110638
Bug ID: 110638
Summary: [13 regression] memcpy should be inlined with sve loop
Product: gcc
Version: 13.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: zhongyunde at huawei dot com
Target Milestone: ---
* test:https://gcc.godbolt.org/z/39KddjbE4
```
void va(struct args_t * func_args)
{
for (int nl = 0; nl < iterations; nl++) {
for (int i = 0; i < LEN_1D; i++) {
a[i] = b[i];
}
dummy(a, b);
}
return ;
}
```
* gcc12: don't transform the loop into a memcpy call, so it can make use of the
new sve feature.
* gcc13: use a normal 'bl memcpy'
The above regression start from gcc13.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/110638] [13 regression] memcpy should be inlined with sve loop
2023-07-12 7:42 [Bug c/110638] New: [13 regression] memcpy should be inlined with sve loop zhongyunde at huawei dot com
@ 2023-07-12 7:53 ` pinskia at gcc dot gnu.org
2023-07-12 7:55 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-07-12 7:53 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110638
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Component|c |target
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I don't see how this is an issue because memcpy in glibc already uses SVE too
...
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/110638] [13 regression] memcpy should be inlined with sve loop
2023-07-12 7:42 [Bug c/110638] New: [13 regression] memcpy should be inlined with sve loop zhongyunde at huawei dot com
2023-07-12 7:53 ` [Bug target/110638] " pinskia at gcc dot gnu.org
@ 2023-07-12 7:55 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-07-12 7:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110638
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |INVALID
Status|UNCONFIRMED |RESOLVED
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Actually this is the correct thing to do. memcpy in glibc has used SVE since
glibc commit 9f298bfe1f183804bb54b54ff9071afc0494906c .
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-07-12 7:55 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-07-12 7:42 [Bug c/110638] New: [13 regression] memcpy should be inlined with sve loop zhongyunde at huawei dot com
2023-07-12 7:53 ` [Bug target/110638] " pinskia at gcc dot gnu.org
2023-07-12 7:55 ` pinskia at gcc dot gnu.org
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).