[Bug tree-optimization/95230] Failure to optimize bit-scatter pattern to and 1

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95230

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2021-11-22 00:00:00         |2023-6-9

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dom is now able to convert it to:
  _19 = val_12(D) & 1;

  <bb 3> [local count: 1019366122]:
  # res_5 = PHI <_19(3), _19(2)>
  # I_34 = PHI <I_31(3), 1(2)>
  I_31 = I_34 + 1;
  if (I_31 != 32)
    goto <bb 3>; [96.90%]
  else
    goto <bb 4>; [3.10%]

  <bb 4> [local count: 32534376]:
  return res_5;

But then nothing does the prop from _19 to res_5 and removes the empty loop.