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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/113339] New: `-a/-b` is not simplified to
 `a/b` if done in seperate statements
Date: Thu, 11 Jan 2024 19:20:16 +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: 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=3D113339

            Bug ID: 113339
           Summary: `-a/-b` is not simplified to `a/b` if done in seperate
                    statements
           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 unopt(int a, int b) {
   a =3D -a;
   b =3D -b;
    return a / b;
}
int opt(int a, int b) {
    return -a / -b;
}
```
I would have expected these 2 would produce the same assembly but only opt =
is
optimized to a/b and the neg is removed.

Note LLVM does not do either: https://github.com/llvm/llvm-project/issues/7=
7717
.=