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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/111110] New: (A CMP B) != 0 and (A CMP B) ==
 true patterns produce an extra (A CMP B) rather than reusing it
Date: Wed, 23 Aug 2023 05:05:55 +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: 14.0
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: pinskia at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111110

            Bug ID: 111110
           Summary: (A CMP B) !=3D 0 and (A CMP B) =3D=3D true patterns pro=
duce
                    an extra (A CMP B) rather than reusing it
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: pinskia at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

(simplify
  (ne (cmp@2 @0 @1) integer_zerop)
  (if (types_match (type, TREE_TYPE (@2)))
   (cmp @0 @1)))
 (simplify
  (eq (cmp@2 @0 @1) integer_truep)
  (if (types_match (type, TREE_TYPE (@2)))
   (cmp @0 @1)))



Those (cmp @0 @1) results really should just be @2 ....=