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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/114670] New: `(a ^ 1) <= 3` can be optimized
 to `a <= 3`
Date: Tue, 09 Apr 2024 23:03:50 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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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: normal
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=3D114670

            Bug ID: 114670
           Summary: `(a ^ 1) <=3D 3` can be optimized to `a <=3D 3`
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

While looking into PR 114666, I noticed this:
```
int f(unsigned a)
{
  return (a^1) <=3D 3;
}

int fa(unsigned a)
{
  return (a) <=3D 3;
}
```

These 2 are the same functions should produce the same code.

Basically if we have `(a ^ CST1) <=3D MASK` where MASK is a (lower) mask wh=
ich
contain the bits of CST1.=