_mm256_maskz_mullo_epi64
Classification
AVX-512, Arithmetic, CPUID Test: AVX512DQ
Header File
Instruction
VPMULLQ ymm {z}, ymm, ymm
Synopsis
_mm256_maskz_mullo_epi64(__mmask8 k, __m256i a, __m256i b);
Description
Multiply the packed 64-bit integers in "a" and "b", producing intermediate 128-bit integers, and store the low 64 bits of the intermediate integers in "dst" using zeromask "k" (elements are zeroed out when the corresponding mask bit is not set).
Operation
FOR j := 0 to 3
i := j*64
IF k[j]
tmp[127:0] := a[i+63:i] * b[i+63:i]
dst[i+63:i] := tmp[63:0]
ELSE
dst[i+63:i] := 0
FI
ENDFOR
dst[MAX:256] := 0