[Bug tree-optimization/110539] [14 Regression] Dead Code Elimination Regression at since r14-338-g1dd154f6407

["pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110539

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

One simple regression:
/* { dg-final { scan-tree-dump-times "Folded to: _\[0-9\]+ = 1;" 1 "dom3"} } */
/* { dg-final { scan-tree-dump-times "Folded to: _\[0-9\]+ = 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 = 1;
  Folded to: _5 = 1;
After:
  Replaced 'bufferstep_36' with constant '0'
gimple_simplified to bufferstep_23 = 1;
  Folded to: bufferstep_23 = 1;