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From: "gabravier at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/96928] New: Failure to optimize one's
 complement abs pattern
Date: Thu, 03 Sep 2020 18:25:54 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 11.0
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X-Bugzilla-Severity: normal
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96928

            Bug ID: 96928
           Summary: Failure to optimize one's complement abs pattern
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gabravier at gmail dot com
  Target Milestone: ---

int f(int a)
{
    return (a < 0) ? ~a : a;
}

This can be optimized to `return (a >> 31) ^ a;`. This transformation is do=
ne
by LLVM, but not by GCC.=