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* [Bug tree-optimization/111275] New: ifcombine and reassociation does not like to produce `a ^ b` sometimes
@ 2023-09-02 21:17 pinskia at gcc dot gnu.org
2023-09-03 7:50 ` [Bug tree-optimization/111275] " pinskia at gcc dot gnu.org
2023-09-03 21:50 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-09-02 21:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111275
Bug ID: 111275
Summary: ifcombine and reassociation does not like to produce
`a ^ b` sometimes
Product: gcc
Version: 14.0
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 f0(_Bool u, _Bool v)
{
_Bool t1, t;
t = !u & v;
t1 = !v & u;
if (t) goto L40;
if (t1) goto L40;
return 0;
L40:
return 1;
}
int f1(_Bool u, _Bool v)
{
_Bool t1, t;
t = !u & v;
if (t) goto L40;
t1 = !v & u;
if (t1) goto L40;
return 0;
L40:
return 1;
}
```
These 2 should just produce `return u ^ v;` (or `return u != v;`) but currently
only f0 does.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/111275] ifcombine and reassociation does not like to produce `a ^ b` sometimes
2023-09-02 21:17 [Bug tree-optimization/111275] New: ifcombine and reassociation does not like to produce `a ^ b` sometimes pinskia at gcc dot gnu.org
@ 2023-09-03 7:50 ` pinskia at gcc dot gnu.org
2023-09-03 21:50 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-09-03 7:50 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111275
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So I suspect this is basically the same issue as PR 67628.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/111275] ifcombine and reassociation does not like to produce `a ^ b` sometimes
2023-09-02 21:17 [Bug tree-optimization/111275] New: ifcombine and reassociation does not like to produce `a ^ b` sometimes pinskia at gcc dot gnu.org
2023-09-03 7:50 ` [Bug tree-optimization/111275] " pinskia at gcc dot gnu.org
@ 2023-09-03 21:50 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-09-03 21:50 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111275
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Depends on| |95034
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is basically PR 95034 .
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95034
[Bug 95034] Failure to convert xor pattern (made out of or+and) to xor
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-09-03 21:50 UTC | newest]
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2023-09-02 21:17 [Bug tree-optimization/111275] New: ifcombine and reassociation does not like to produce `a ^ b` sometimes pinskia at gcc dot gnu.org
2023-09-03 7:50 ` [Bug tree-optimization/111275] " pinskia at gcc dot gnu.org
2023-09-03 21:50 ` pinskia at gcc dot gnu.org
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