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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/88280] missing folding of logical and bitwise AND Date: Thu, 12 Oct 2023 17:16:40 +0000 [thread overview] Message-ID: <bug-88280-4-fNmTjHKfyS@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-88280-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88280 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED Assignee|unassigned at gcc dot gnu.org |pinskia at gcc dot gnu.org --- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Match pattern: ``` (for cmp (eq ne ) bop (bit_ior bit_and) (bop:c (cmp @0 integer_zerop) (cmp@2 (bit_and:c @0 @1) integer_zerop)) @2) ``` testcase that shows the issue (of the swapped order of the ifs) ``` _Bool f0(int a, int b) { if (a == 0) return 1; return (a & b) == 0; // (a==0) | ((a &b) == 0) -> ((a &b) == 0) } _Bool f0_(int a, int b) { if ((a & b) == 0) return 1; return a == 0; // ((a &b) == 0) | (a==0) -> ((a &b) == 0) } _Bool f1(int a, int b) { if (a != 0) return (a & b) != 0; return 0; // (a!=0) & ((a & b) != 0) -> ((a & b) != 0) } _Bool f1_(int a, int b) { if ((a & b) != 0) return a != 0; return 0; // ((a & b) != 0) & (a!=0) -> ((a & b) != 0) } ```
prev parent reply other threads:[~2023-10-12 17:16 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <bug-88280-4@http.gcc.gnu.org/bugzilla/> 2023-05-06 18:56 ` pinskia at gcc dot gnu.org 2023-10-12 17:16 ` pinskia at gcc dot gnu.org [this message]
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