https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101523
--- Comment #16 from Segher Boessenkool <segher at gcc dot gnu.org> --- (In reply to Andreas Krebbel from comment #14) > If my analysis from comment #1 is correct, combine does superfluous steps > here. Getting rid of this should not cause any harm, but should be > beneficial for other targets as well. I agree that the patch I've proposed > is kind of a hack. Do you think this could be turned into a proper fix? When some insns have changed (or might have changed, combine does not always know the details), combinations of the insn with later insns are tried again. Sometimes this finds new combination opportunities. Not retrying combinations after one of the insns has changed would be a regression.
