https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70134
--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> --- PowerPC has no simple way to set a CR field to "equal". We could add a pattern to do that (which will cost 2 insns, so works for 3->2 combinations, like we in fact get here; something like li X,0 ; cmpwi X,0 ). But, this is normally handled by cprop, and in fact it works like you would hope if you just add -fgcse. So is this a bug, or just something -O1 does not do?
