https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101822

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
   Last reconfirmed|                            |2021-08-08
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |ASSIGNED
           Severity|normal                      |enhancement
                 CC|                            |pinskia at gcc dot gnu.org

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
MIne, phiopt is not working for this case:
  if (n_4(D) != 0)
    goto <bb 3>; [89.00%]
  else
    goto <bb 4>; [11.00%]

  <bb 3> [local count: 105119324]:
  _9 = __builtin_popcount (n_4(D));
  count_13 = (uint32_t) _9;

  <bb 4> [local count: 118111600]:
  # count_12 = PHI <count_13(3), 0(2)>

The code in phiopt for handling casts is not done correctly.

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