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Legacy encodings of SSE instructions incur AVX-SSE domain transition penalties on some Intel microarchitectures (e.g. Haswell, Broadwell). Using the VEX forms avoids these penatlies and keeps all instructions in the VEX decode domain. Use "%v" sequence to emit the "v" prefix for opcodes when compiling with -mavx. No functional changes intended. Signed-off-by: Uros Bizjak <ubizjak@gmail.com> Reviewed-by: Florian Weimer <fweimer@redhat.com> Reviewed-by: H.J. Lu <hjl.tools@gmail.com>