https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66852
--- Comment #10 from Jeffrey Walton <noloader at gmail dot com> --- (In reply to Richard Biener from comment #6) > So I suppose the IsAligned template is wrong. So I'm clear (please forgive my ignorance)... According to http://www.felixcloutier.com/x86/MOVDQA.html, vmovdqa requires values double quad word alignment (16-byte). A word64 is aligned on 8-bytes, and does not meet the precondition to use the instruction. Naively, that seems like a problem to me. Will that create problems with GCC and vectorizations?