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* [Bug tree-optimization/100609] New: bool - 1 is not simplified to -a
@ 2021-05-15 4:03 pinskia at gcc dot gnu.org
2021-05-15 4:19 ` [Bug tree-optimization/100609] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-05-15 4:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100609
Bug ID: 100609
Summary: bool - 1 is not simplified to -a
Product: gcc
Version: 12.0
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
Blocks: 25290
Target Milestone: ---
Take:
int f(_Bool a)
{
int t = a;
return t - 1;
}
int g(_Bool a)
{
int t = a;
return -t;
}
---- CUT ----
Both of these are the same and should produce the same code gen.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25290
[Bug 25290] PHI-OPT could be rewritten so that is uses match
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/100609] bool - 1 is not simplified to -a
2021-05-15 4:03 [Bug tree-optimization/100609] New: bool - 1 is not simplified to -a pinskia at gcc dot gnu.org
@ 2021-05-15 4:19 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-05-15 4:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100609
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |INVALID
Status|UNCONFIRMED |RESOLVED
Assignee|unassigned at gcc dot gnu.org |pinskia at gcc dot gnu.org
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Wait, I did this wrong.
a - 1 is - (~a).
Never mind.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-05-15 4:03 [Bug tree-optimization/100609] New: bool - 1 is not simplified to -a pinskia at gcc dot gnu.org
2021-05-15 4:19 ` [Bug tree-optimization/100609] " pinskia at gcc dot gnu.org
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