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* [Bug tree-optimization/112814] New: `Plus <PHI <a,b>, PHI<b,a>>` is not optimized to just PLUS<a,b>
@ 2023-12-01 20:39 pinskia at gcc dot gnu.org
2023-12-01 20:42 ` [Bug tree-optimization/112814] " pinskia at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-12-01 20:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112814
Bug ID: 112814
Summary: `Plus <PHI <a,b>, PHI<b,a>>` is not optimized to just
PLUS<a,b>
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: pinskia at gcc dot gnu.org
Target Milestone: ---
Take:
```
int f(int a, int b, int c)
{
int d, e;
if (c) d = a, e = b;
else d = b, e = a;
return d+e;
}
```
This should just be optimized to `return a+b` but it is currently not.
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug tree-optimization/112814] `Plus <PHI <a,b>, PHI<b,a>>` is not optimized to just PLUS<a,b>
2023-12-01 20:39 [Bug tree-optimization/112814] New: `Plus <PHI <a,b>, PHI<b,a>>` is not optimized to just PLUS<a,b> pinskia at gcc dot gnu.org
@ 2023-12-01 20:42 ` pinskia at gcc dot gnu.org
2023-12-01 20:43 ` pinskia at gcc dot gnu.org
2023-12-04 6:50 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-12-01 20:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112814
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://github.com/llvm/llv
| |m-project/issues/73904
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Similarly:
```
int f(int a, int b, int c)
{
int d, e;
return (c ? a : b) + (c ? b : a);
}
```
Note the above could be done using a match pattern. catching it before
gimplification.
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug tree-optimization/112814] `Plus <PHI <a,b>, PHI<b,a>>` is not optimized to just PLUS<a,b>
2023-12-01 20:39 [Bug tree-optimization/112814] New: `Plus <PHI <a,b>, PHI<b,a>>` is not optimized to just PLUS<a,b> pinskia at gcc dot gnu.org
2023-12-01 20:42 ` [Bug tree-optimization/112814] " pinskia at gcc dot gnu.org
@ 2023-12-01 20:43 ` pinskia at gcc dot gnu.org
2023-12-04 6:50 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-12-01 20:43 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112814
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug tree-optimization/112814] `Plus <PHI <a,b>, PHI<b,a>>` is not optimized to just PLUS<a,b>
2023-12-01 20:39 [Bug tree-optimization/112814] New: `Plus <PHI <a,b>, PHI<b,a>>` is not optimized to just PLUS<a,b> pinskia at gcc dot gnu.org
2023-12-01 20:42 ` [Bug tree-optimization/112814] " pinskia at gcc dot gnu.org
2023-12-01 20:43 ` pinskia at gcc dot gnu.org
@ 2023-12-04 6:50 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2023-12-04 6:50 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112814
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2023-12-04
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Interesting one - this isn't catched by PRE code hoisting because that only
hoists sth if it's available in one of the successors (but it's only antic
there).
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2023-12-04 6:50 UTC | newest]
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2023-12-01 20:39 [Bug tree-optimization/112814] New: `Plus <PHI <a,b>, PHI<b,a>>` is not optimized to just PLUS<a,b> pinskia at gcc dot gnu.org
2023-12-01 20:42 ` [Bug tree-optimization/112814] " pinskia at gcc dot gnu.org
2023-12-01 20:43 ` pinskia at gcc dot gnu.org
2023-12-04 6:50 ` rguenth at gcc dot gnu.org
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