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* [Bug tree-optimization/108841] New: sometimes a < b && c < b is not optimized to MAX<a, c> < b
@ 2023-02-18 4:10 pinskia at gcc dot gnu.org
2023-02-20 8:20 ` [Bug tree-optimization/108841] " rguenth at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-02-18 4:10 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108841
Bug ID: 108841
Summary: sometimes a < b && c < b is not optimized to MAX<a, c>
< b
Product: gcc
Version: 13.0
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:
```
int f1(int a0, int a1, int b, int c0, int c1)
{
int a = a0 < a1 ? a1 : a0;
if (a < b) {
int c = c0 < c1 ? c1 : c0;
if (c < b)
return 0;
}
return 1;
}
int f2(int a0, int a1, int b, int c0, int c1)
{
int a = a0 < a1 ? a1 : a0;
int c = c0 < c1 ? c1 : c0;
if (a < b) {
if (c < b)
return 0;
}
return 1;
}
```
These 2 functions should produce the same code, the only difference is the
calculation of c is not condtional.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/108841] sometimes a < b && c < b is not optimized to MAX<a, c> < b
2023-02-18 4:10 [Bug tree-optimization/108841] New: sometimes a < b && c < b is not optimized to MAX<a, c> < b pinskia at gcc dot gnu.org
@ 2023-02-20 8:20 ` rguenth at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: rguenth at gcc dot gnu.org @ 2023-02-20 8:20 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108841
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2023-02-20
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Maybe made worse by r12-8012-gfc8d9e4497032d
^ permalink raw reply [flat|nested] 2+ messages in thread
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2023-02-18 4:10 [Bug tree-optimization/108841] New: sometimes a < b && c < b is not optimized to MAX<a, c> < b pinskia at gcc dot gnu.org
2023-02-20 8:20 ` [Bug tree-optimization/108841] " rguenth at gcc dot gnu.org
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