http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59163
--- Comment #14 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Uroš Bizjak from comment #13) > (In reply to Jakub Jelinek from comment #12) > > Created attachment 31332 [details] > > gcc49-pr59163.patch > > > > So like this? > > Yes, with adjusted comment in ix86_legitimate_combined_insn. > > IIRC, unaligned moves won't be propagated during or after reload, so it > looks to me that the approach is correct. Running the testsuite with your patch applied exposed a minor problem: FAIL: gcc.target/i386/sse-1.c scan-assembler-not movaps movlps/movhps and movlpd/movhpd can also handle unaligned operands (please see ix86_expand_vector_move_misalign). We should simply tag instructions that operate on unaligned operands (attribute type = ssemovu) and check type attribute instead. The proposed approach would mean to change all scheduler and attribute calculation checks from "ssemov" to "ssemov,ssemovu", but this would be a simple mechanical change.
