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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/112096] New: `(a || b) ? a : b` should be
 simplified to a
Date: Thu, 26 Oct 2023 05:16:21 +0000
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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
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112096

            Bug ID: 112096
           Summary: `(a || b) ? a : b` should be simplified to a
           Product: gcc
           Version: 14.0
            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: ---

Take:
```
int t0(int x, int y)
{
  _Bool t =3D x =3D=3D 0 && y =3D=3D 0;
  if (t) return x; return y;
} // y

int t0_(int x, int y)
{
  _Bool t =3D x =3D=3D 0 && y =3D=3D 0;
  if (t) return 0; return y;
} // y

int t1(int x, int y)
{
  _Bool t =3D x || y;
  if (t) return x; return y;
} // x
int t1_(int x, int y)
{
  _Bool t =3D x || y;
  if (t) return x; return 0;
} // x
```
These should be simplified as the comment says

All 4 of these are caught by LLVM.=