Function _mm_sign_epi8
#[target_feature(enable = "ssse3")]
pub fn _mm_sign_epi8(a: __m128i, b: __m128i) -> __m128iNegates packed 8-bit integers in a when the corresponding signed 8-bit
integer in b is negative, and returns the result.
Elements in result are zeroed out when the corresponding element in b
is zero.