[Bug tree-optimization/102920] [12 Regression] Wrong code with -O3

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102920

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Target Milestone|---                         |12.0
                 CC|                            |rguenth at gcc dot gnu.org
   Last reconfirmed|                            |2021-10-25

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
  <bb 6> [local count: 70079549]:
  var_123 = _27(D);
  goto <bb 3>; [100.00%]


Fre messed up:
Before:
  # var_120_lsm.8_36 = PHI <_1(5), _27(D)(4)>
  # var_120_lsm_flag.9_37 = PHI <1(5), 0(4)>
  # var_123_lsm.10_38 = PHI <_24(D)(5), _43(4)>
  # var_123_lsm_flag.11_39 = PHI <0(5), 1(4)>

After:
  # var_120_lsm.8_36 = PHI <_1(5), _27(D)(4)>
  # var_120_lsm_flag.9_37 = PHI <1(5), 0(4)>
  # var_123_lsm_flag.11_39 = PHI <0(5), 1(4)>

This would mean this was caused by r12-4625-gfe8475c500.