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* [Bug tree-optimization/115571] New: `cmp * float` vs `tmp_bool * float` and better vectorization for `cmp * float`
@ 2024-06-21 1:15 pinskia at gcc dot gnu.org
2024-06-21 7:46 ` [Bug tree-optimization/115571] " rguenth at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-06-21 1:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115571
Bug ID: 115571
Summary: `cmp * float` vs `tmp_bool * float` and better
vectorization for `cmp * float`
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: pinskia at gcc dot gnu.org
Target Milestone: ---
Take:
```
void f(float *c, int *a)
{
for (int i = 0; i < 1024; i++)
{
bool t = a[i] == 10;
c[i] = t * c[i];
}
}
void f1(float *c, int *a)
{
for (int i = 0; i < 1024; i++)
{
c[i] = (a[i] == 10) * c[i];
}
}
```
The second one is vectorized better than the first one at -Ofast due to the
second one being converted into `(a[i] == 10) ? c : 0` in fold before
gimplification.
This was inspired by https://github.com/llvm/llvm-project/pull/96216 .
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/115571] `cmp * float` vs `tmp_bool * float` and better vectorization for `cmp * float`
2024-06-21 1:15 [Bug tree-optimization/115571] New: `cmp * float` vs `tmp_bool * float` and better vectorization for `cmp * float` pinskia at gcc dot gnu.org
@ 2024-06-21 7:46 ` rguenth at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: rguenth at gcc dot gnu.org @ 2024-06-21 7:46 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115571
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2024-06-21
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2024-06-21 1:15 [Bug tree-optimization/115571] New: `cmp * float` vs `tmp_bool * float` and better vectorization for `cmp * float` pinskia at gcc dot gnu.org
2024-06-21 7:46 ` [Bug tree-optimization/115571] " rguenth at gcc dot gnu.org
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