https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78821
--- Comment #22 from Uroš Bizjak <ubizjak at gmail dot com> --- (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. 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.
