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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/111002] New: Code generation for vectorized
 -(a[i] != 0) with number of elements chang could be improved
Date: Sat, 12 Aug 2023 09:37:21 +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=3D111002

            Bug ID: 111002
           Summary: Code generation for vectorized -(a[i] !=3D 0) with
                    number of elements chang could be improved
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: pinskia at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Testcase:
```
void __attribute__ ((noipa))
f (int *__restrict r,
   int *__restrict a,
   short *__restrict pred)
{
  for (int i =3D 0; i < 1024; ++i)
    r[i] =3D pred[i] !=3D 0 ? -1 : 0;
}
```

Kinda of patch:
```
/* Sink unary operations to branches, but only if we do fold both.  */
(for op (negate bit_not abs absu)
 (simplify
  (op (view_convert? (vec_cond:s @0 @1 @2)))
  (if (element_precision (type) =3D=3D element_precision (@1))
   (vec_cond @0 (op! (view_convert @1)) (op! (view_convert @2))))))
```

That is `Sink unary operations` one needs to add support for view_convert t=
here
...

I Noticed this while working on PR 110986 (but is not needed for that issue=
).=