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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/110009] New: Another missing ABS detection
Date: Sun, 28 May 2023 00:18:37 +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=3D110009

            Bug ID: 110009
           Summary: Another missing ABS detection
           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: 109907
  Target Milestone: ---

Take:
```
unsigned
f1 (int v)
{
  unsigned int d_6;
  int b_5;
  unsigned int v1_2;
  unsigned int _7;
  int _9;

  b_5 =3D v>>(sizeof(v)*8 - 1);
  _9 =3D b_5 | 1;
  d_6 =3D (unsigned int) _9;
  v1_2 =3D (unsigned int) v;
  _7 =3D v1_2 * d_6;
  return _7;
}
```
This currently does not get converted to `return ABSU<v>`.

I found this while implementing a different match pattern and found that the
testcase pr103245-1.c was failing.

This blocks PR 109907 because the patch which is to fix a regression from t=
he
patch of bug 109907 comment #25 introduces this.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109907
[Bug 109907] Missed optimization for bit extraction (uses shift instead of
single bit-test)=