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* [Bug tree-optimization/115306] New: (X + 1) > Y ? -X : 1 pattern does not handle X=~X nor X = -X;
@ 2024-05-31 13:49 pinskia at gcc dot gnu.org
2024-05-31 13:50 ` [Bug tree-optimization/115306] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-05-31 13:49 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115306
Bug ID: 115306
Summary: (X + 1) > Y ? -X : 1 pattern does not handle X=~X nor
X = -X;
Product: gcc
Version: 15.0
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: ---
The new pattern:
/* (1 - X) > Y ? X : 1 simplifies to (-X) >= Y ? X : 1 when
X is unsigned for the same logic as above, just replace X with -X. */
(simplify
(cond (gt (minus integer_onep @0) @1) @0 integer_onep@2)
(if (TYPE_UNSIGNED (type))
(cond (ge (negate @0) @1) @0 @2)))
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/115306] (X + 1) > Y ? -X : 1 pattern does not handle X=~X nor X = -X;
2024-05-31 13:49 [Bug tree-optimization/115306] New: (X + 1) > Y ? -X : 1 pattern does not handle X=~X nor X = -X; pinskia at gcc dot gnu.org
@ 2024-05-31 13:50 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-05-31 13:50 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115306
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2024-05-31
Assignee|unassigned at gcc dot gnu.org |pinskia at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Mine, filing as I will get back to this in a few but want to finish up a
different patch.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2024-05-31 13:49 [Bug tree-optimization/115306] New: (X + 1) > Y ? -X : 1 pattern does not handle X=~X nor X = -X; pinskia at gcc dot gnu.org
2024-05-31 13:50 ` [Bug tree-optimization/115306] " pinskia at gcc dot gnu.org
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