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* [Bug tree-optimization/94916] New: Failure to optimize pattern into difference or zero selector
@ 2020-05-02 8:35 gabravier at gmail dot com
2021-04-26 1:15 ` [Bug tree-optimization/94916] " pinskia at gcc dot gnu.org
2023-05-13 5:55 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: gabravier at gmail dot com @ 2020-05-02 8:35 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94916
Bug ID: 94916
Summary: Failure to optimize pattern into difference or zero
selector
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: gabravier at gmail dot com
Target Milestone: ---
int f(int x, int y)
{
return (x - y) & -(x >= y);
}
This can be optimized to return x >= y ? x - y : 0. LLVM does this
transformation, but GCC does not. (also, GCC fails to optimize the resulting
pattern properly, but this is already reported in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94898)
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/94916] Failure to optimize pattern into difference or zero selector
2020-05-02 8:35 [Bug tree-optimization/94916] New: Failure to optimize pattern into difference or zero selector gabravier at gmail dot com
@ 2021-04-26 1:15 ` pinskia at gcc dot gnu.org
2023-05-13 5:55 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-04-26 1:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94916
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/94916] Failure to optimize pattern into difference or zero selector
2020-05-02 8:35 [Bug tree-optimization/94916] New: Failure to optimize pattern into difference or zero selector gabravier at gmail dot com
2021-04-26 1:15 ` [Bug tree-optimization/94916] " pinskia at gcc dot gnu.org
@ 2023-05-13 5:55 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-05-13 5:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94916
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |13.0
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=3507
Resolution|--- |FIXED
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
GCC 13 gets:
movl %edi, %eax
xorl %edx, %edx
subl %esi, %eax
cmpl %esi, %edi
cmovl %edx, %eax
ret
The rest is recorded as PR 3507.
So closing as fixed.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-05-13 5:55 UTC | newest]
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2020-05-02 8:35 [Bug tree-optimization/94916] New: Failure to optimize pattern into difference or zero selector gabravier at gmail dot com
2021-04-26 1:15 ` [Bug tree-optimization/94916] " pinskia at gcc dot gnu.org
2023-05-13 5:55 ` pinskia at gcc dot gnu.org
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