[Bug tree-optimization/96696] Failure to optimize div+mul to mod+sub

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96696

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-08-25

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  We have

/* Simplify (unsigned t / 2) * 2 -> unsigned t & ~1.  */
(simplify
 (mult (trunc_div @0 integer_pow2p@1) @1)
 (if (TYPE_UNSIGNED (TREE_TYPE (@0)))
  (bit_and @0 (negate @1))))