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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/115306] New: (X + 1) > Y ? -X : 1 pattern
 does not handle X=~X nor X = -X;
Date: Fri, 31 May 2024 13:49:36 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 15.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115306

            Bug ID: 115306
           Summary: (X + 1) > Y ? -X : 1 pattern does not handle X=3D~X nor
                    X =3D -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) >=3D 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)))=