https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107172
--- Comment #16 from Segher Boessenkool <segher at gcc dot gnu.org> --- Hi Roger, (In reply to Roger Sayle from comment #15) > Yes, a COMPARE rtx can be used to set various flags on x86, but many other > operations also legitimately set and/or use MODE_CC, often in a parallel > with the primary operation. *Any* MODE_CC setter sets the flags as-if from a compare. This is what MODE_CC *is*. Setting something as ne:CC and then using it as somethingelse:CC has no defined meaning.