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* [Bug tree-optimization/109869] New: comparing SCHAR_MIN and SCHAR_MAX but with widden type could be optimized better
@ 2023-05-16 2:48 pinskia at gcc dot gnu.org
2023-05-17 6:58 ` [Bug tree-optimization/109869] " rguenth at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-05-16 2:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109869
Bug ID: 109869
Summary: comparing SCHAR_MIN and SCHAR_MAX but with widden type
could be optimized better
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 (for most targets):
```
bool f1 (signed char i)
{
unsigned long long _1 = i;
bool _5 = _1 == 127;
bool _6 = _1 == 18446744073709551488ull;
return _5 | _6;
}
bool f2 (signed char i)
{
return i == -128 || i == 127;
__SIZE_TYPE__ _1 = i;
}
```
These two functions should produce the same code.
I noticed this while looking at PR 77899 .
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/109869] comparing SCHAR_MIN and SCHAR_MAX but with widden type could be optimized better
2023-05-16 2:48 [Bug tree-optimization/109869] New: comparing SCHAR_MIN and SCHAR_MAX but with widden type could be optimized better pinskia at gcc dot gnu.org
@ 2023-05-17 6:58 ` rguenth at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: rguenth at gcc dot gnu.org @ 2023-05-17 6:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109869
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2023-05-17
^ permalink raw reply [flat|nested] 2+ messages in thread
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2023-05-16 2:48 [Bug tree-optimization/109869] New: comparing SCHAR_MIN and SCHAR_MAX but with widden type could be optimized better pinskia at gcc dot gnu.org
2023-05-17 6:58 ` [Bug tree-optimization/109869] " rguenth at gcc dot gnu.org
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