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* [Bug c/107359] New: [aarch64] should avoid the punpklo/punpkhi compare to llvm
@ 2022-10-23 5:51 zhongyunde at huawei dot com
2022-10-23 6:57 ` [Bug target/107359] " pinskia at gcc dot gnu.org
2022-10-23 7:08 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: zhongyunde at huawei dot com @ 2022-10-23 5:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107359
Bug ID: 107359
Summary: [aarch64] should avoid the punpklo/punpkhi compare to
llvm
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: zhongyunde at huawei dot com
Target Milestone: ---
* case, https://godbolt.org/z/38bcszxdo
```
int check (char *mask, double *result, int n) {
int count = 0;
for (int i=0; i<n; i++) {
if (mask[i] == 0 && result[i] != 2.0)
count++;
}
return count;
}
```
gcc may also choose more wider SVE to avoid the punpklo/punpkhi.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/107359] [aarch64] should avoid the punpklo/punpkhi compare to llvm
2022-10-23 5:51 [Bug c/107359] New: [aarch64] should avoid the punpklo/punpkhi compare to llvm zhongyunde at huawei dot com
@ 2022-10-23 6:57 ` pinskia at gcc dot gnu.org
2022-10-23 7:08 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-10-23 6:57 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107359
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Options: -O3 -march=armv8.2-a+sve
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/107359] [aarch64] should avoid the punpklo/punpkhi compare to llvm
2022-10-23 5:51 [Bug c/107359] New: [aarch64] should avoid the punpklo/punpkhi compare to llvm zhongyunde at huawei dot com
2022-10-23 6:57 ` [Bug target/107359] " pinskia at gcc dot gnu.org
@ 2022-10-23 7:08 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-10-23 7:08 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107359
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2022-10-23
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
Note if you use float instead of double. GCC produces better code. That is the
following testcase:
int check (char *mask, float *result, int n) {
int count = 0;
for (int i=0; i<n; i++) {
if (mask[i] == 0 && result[i] != 2.0)
count++;
}
return count;
}
So GCC could do this; just misses the 64bit case ...
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-10-23 7:08 UTC | newest]
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2022-10-23 5:51 [Bug c/107359] New: [aarch64] should avoid the punpklo/punpkhi compare to llvm zhongyunde at huawei dot com
2022-10-23 6:57 ` [Bug target/107359] " pinskia at gcc dot gnu.org
2022-10-23 7:08 ` pinskia at gcc dot gnu.org
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