https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67145
--- Comment #13 from Richard Henderson <rth at gcc dot gnu.org> --- I can clean up the rs6000 some more to avoid some objections that Segher raised -- by-hand rtl generation etc. Or, I've just about finished testing the simplify-rtx-only patch suggested in https://gcc.gnu.org/ml/gcc-patches/2016-02/msg01858.html So, that at least is a working option to fix the x86 regression without touching the rs6000 backend during stage4.