https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78821
--- Comment #23 from Jakub Jelinek <jakub at gcc dot gnu.org> --- (In reply to Uroš Bizjak from comment #22) > (In reply to Jakub Jelinek from comment #21) > > Created attachment 42660 [details] > > gcc8-pr78821-i386.patch > > > > Untested patch for the -mmovbe movbew loads/stores. Note, is there any > > particular reason why we don't use for AT&T syntax w/l/q suffixes for movbe? > > At least looking at binutils testsuite, it covers both movbe without suffix > > and movbe[wlq]. On the other side, for bswap insn there are no suffixes. > > No particular reason - we should add suffixes. Ok, will add them incrementally. > OTOH, proposed patch should use enabled attribute to enable xchg, and split > the pattern after reload to lose FLAGS_REG clobber for xchg and movbe > aliternatives. I believe enabled attribute can't depend on optimize_function_for_size_p (cfun). Splitting after reload is something I can certainly do.
