https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98461
--- Comment #10 from Hongtao.liu <crazylht at gmail dot com> --- (In reply to Hongtao.liu from comment #9) > > 128: https://godbolt.org/z/Exo3d9 > > zero_extend should be redudant, add another combine splitter for the bellow? Pass_combine failed to match combine_splitter with i0, i1 as NULL, so add define_insn_and_split.