For platform that supports AVX2 instructions, use the AVX2 instructions instead of SSE2 instructions in buffer_find_nonzero_offset() can help to improve the performance about 30%. Zero page check during live migration can be faster with this optimization.
Signed-off-by: Liang Li <liang.z...@intel.com> --- include/qemu-common.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/include/qemu-common.h b/include/qemu-common.h index bbaffd1..629fcac 100644 --- a/include/qemu-common.h +++ b/include/qemu-common.h @@ -468,6 +468,13 @@ void qemu_hexdump(const char *buf, FILE *fp, const char *prefix, size_t size); /* altivec.h may redefine the bool macro as vector type. * Reset it to POSIX semantics. */ #define bool _Bool +#elif defined __AVX2__ +#include <immintrin.h> +#define VECTYPE __m256i +#define SPLAT(p) _mm256_set1_epi8(*(p)) +#define ALL_EQ(v1, v2) \ + (_mm256_movemask_epi8(_mm256_cmpeq_epi8(v1, v2)) == 0xFFFFFFFF) +#define VEC_OR(v1, v2) (_mm256_or_si256(v1, v2)) #elif defined __SSE2__ #include <emmintrin.h> #define VECTYPE __m128i -- 1.9.1
