https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91719
--- Comment #4 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Jakub Jelinek from comment #3) > So, I guess we need to benchmark both and if xchg is beneficial on some > CPUs, use it there guarded by some tuning flag. Yes, my patch assumes that XCHG is beneficial on all CPUs, which may not be the case.
