https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116189
--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> --- make_insn_raw: cur_uid: 1084 make_insn_raw: cur_debug_uid: 21 make_insn_raw: cur_uid: 1085 make_insn_raw: cur_debug_uid: 21 cannot propagate from insn 1022 into insn 19: would increase complexity of pattern This is from forwprop. This is where the issue of the difference comes from.