http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59952
--- Comment #18 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Jakub Jelinek from comment #17) > I'm not sure about that, after all we enable PTA_HLE even for generic. > The point is whether it might be beneficial to emit the HLE prefixes or not, > on CPUs that never have HLE obviously it doesn't make sense, on CPUs that > sometimes or always have it it makes sense. Ah, you are right. PTA_HLE is benign. It is emitted as a prefix, and is ignored on non-HLE CPUs.