http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58044
--- Comment #1 from Jérôme Pouiller <jerome.pouiller at gmail dot com> ---
AVX instructions seems to not been generated by assembler. Compiler directly
generate these instructions. Since -mavx2 is specified, compiler behaviour can
be considered correct. But, I don't see any case where -mno-sse2avx may change
result, isn't? This option may be removed?
For my specific test case, there is a workaround. I can add
__attribute__((__target__("no-avx"))) to memcpy_16to8_sse.
