https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67032
--- Comment #12 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Richard Biener from comment #11) > I thought using %xmm registers is _always_ wrong unless the user properly > saved/restored the FP stack state. > > So not sure why we still have MMX support at all (apart from for intrinsics > which probably need to expose things to the RA again... sigh). In the above testcase, the %mm register was allocated automatically, without using intrinsics. There is a penalty for allocation of %mm (see Comment #6), but it is ineffective for recent gcc releases.
