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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/112402] New: [11/12/13/14 Regression] Path
 splitting causes if-conversion miss
Date: Mon, 06 Nov 2023 06:53:25 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112402

            Bug ID: 112402
           Summary: [11/12/13/14 Regression] Path splitting causes
                    if-conversion miss
           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
            Blocks: 94274
  Target Milestone: ---

Similar to PR 68541 except instead of having a diamond, we just have a
triangle.

Testcase:
```
int
foo(signed char *p, int n)
{
  int s =3D 0;
  int i;

  for (i =3D 0; i < n; i++) {
    int t;
    if (p[i] >=3D 0)
      t=3D1;
    else
      t=3D-1;
    s+=3Dt;
  }

  return s;
}
```

I noticed this while working on fixing PR 94274.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94274
[Bug 94274] fold phi whose incoming args are defined from binary operations=