_mm256_reduce_mul_epi8
Classification
AVX-512, Arithmetic, CPUID Test: AVX512BW
Header File
Synopsis
_mm256_reduce_mul_epi8(__m256i a);
Description
Reduce the packed 8-bit integers in "a" by multiplication. Returns the sum of all elements in "a".
Operation
DEFINE REDUCE_MUL(src, len) {
IF len == 2
RETURN src[7:0] * src[15:8]
FI
len := len / 2
FOR j:= 0 to (len-1)
i := j*8
src[i+7:i] := src[i+7:i] * src[i+8*len+15:i+8*len]
ENDFOR
RETURN REDUCE_MUL(src[8*len-1:0], len)
}
dst[7:0] := REDUCE_MUL(a, 32)