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* [Bug tree-optimization/98955] New: Failure to optimize shift+compare to single shift
@ 2021-02-03 15:57 gabravier at gmail dot com
2021-07-28 21:26 ` [Bug tree-optimization/98955] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: gabravier at gmail dot com @ 2021-02-03 15:57 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98955
Bug ID: 98955
Summary: Failure to optimize shift+compare to single shift
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: gabravier at gmail dot com
Target Milestone: ---
bool f(uint8_t m)
{
return m << 1 > 0xff;
}
This can be optimized to `return m >> 7;`. This transformation is done by LLVM,
but not by GCC.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/98955] Failure to optimize shift+compare to single shift
2021-02-03 15:57 [Bug tree-optimization/98955] New: Failure to optimize shift+compare to single shift gabravier at gmail dot com
@ 2021-07-28 21:26 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-07-28 21:26 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98955
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
Last reconfirmed| |2021-07-28
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-02-03 15:57 [Bug tree-optimization/98955] New: Failure to optimize shift+compare to single shift gabravier at gmail dot com
2021-07-28 21:26 ` [Bug tree-optimization/98955] " pinskia at gcc dot gnu.org
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