https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68507
--- Comment #3 from Daniel Santos <daniel.santos at pobox dot com> --- (In reply to Andrew Pinski from comment #2) > I think there is an ABI difference with respect of xmm6-16 between sysv ABI > and windows ABIs. Can you provide why you think this is not a bug? Ehem, uh no. I was recently informed that sysv_abi treats xmm registers as temp, but I need to read up on this topic. If this is really true then this bug report would be invalid (but still very sad).