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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/101706] New: bool0^bool1^1 -> bool0 == bool1
Date: Sat, 31 Jul 2021 19:44:55 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 12.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101706

            Bug ID: 101706
           Summary: bool0^bool1^1 -> bool0 =3D=3D bool1
           Product: gcc
           Version: 12.0
            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: ---

void fa(bool &a, bool &b, bool &c)
{
    c=3D a=3D=3Db;
}
void fb(bool &a, bool &b, bool &c)
{
    int t =3D (a^b);
    c=3D (t^1);
}

I don't know how often this shows up but I am putting this here for
completeness.=