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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/110539] [14 Regression] Dead Code Elimination
 Regression at since r14-338-g1dd154f6407
Date: Thu, 06 Jul 2023 22:44:08 +0000
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X-Bugzilla-Component: tree-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110539

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #4)
> yes adding:
> /* (convert)(zeroone !=3D 0) into (convert)zeroone */
> /* (convert)(zeroone =3D=3D 0) into ((convert)zeroone)^1 */
> (for neeq (ne eq)
>  (simplify
>   (convert (neeq zero_one_valued_p@0 integer_zerop))
>   (if (neeq =3D=3D NE_EXPR)
>    (convert @0)
>    (bit_xor (convert @0) { build_one_cst (type); } ))))
>=20
>=20
> Fixes the original testcase.

One simple regression:
/* { dg-final { scan-tree-dump-times "Folded to: _\[0-9\]+ =3D 1;" 1 "dom3"=
} } */
/* { dg-final { scan-tree-dump-times "Folded to: _\[0-9\]+ =3D 0;" 1 "dom3"=
} } */

fail now but that is they just don't match the above on accident.

Before:
  Replaced 'bufferstep_36' with constant '0'
gimple_simplified to _5 =3D 1;
  Folded to: _5 =3D 1;
After:
  Replaced 'bufferstep_36' with constant '0'
gimple_simplified to bufferstep_23 =3D 1;
  Folded to: bufferstep_23 =3D 1;=