[Bug tree-optimization/122394] [15 regression] ICE when building webkit-gtk-2.50.1 with -ggdb (expand_debug_locations, at cfgexpand.cc:6042)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122394

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|debug                       |tree-optimization
   Last reconfirmed|                            |2025-10-23
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
PHIOPT2 (spaceship opt):
produces:
  # DEBUG D#1 => _10 < _11 ? -1 : 2
  # DEBUG D#2 => _10 > _11 ? 1 : D#1
  # DEBUG D#3 => _10 == _11 ? 0 : D#2
  # DEBUG D#4 => (unsigned int) D#3
  std::__cmp_cat::__unspec::__unspec (&D.2813, 0B);
  # DEBUG D.2802 => D#3


This might be why this does not show up on the trunk due to the value change of
unordered (but I noticed even with a change to the preprocessed source phiopt
does not do this still).

D#4 seems to be in the wrong mode when expanding:
;; # DEBUG D#4 => (unsigned int) D#3

(debug_insn 18 17 0 (var_location:QI D#4 (const_int 0 [0])) -1
     (nil))

That is what is causing the issue.