_mm256_maskz_permutex2var_epi64
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
Instruction
VPERMI2Q ymm {z}, ymm, ymm
Synopsis
_mm256_maskz_permutex2var_epi64(__mmask8 k, __m256i a, __m256i idx, __m256i b);
Description
Shuffle 64-bit integers in "a" and "b" across lanes using the corresponding selector and index in "idx", and store the results 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
off := idx[i+1:i]*64
IF k[j]
dst[i+63:i] := (idx[i+2]) ? b[off+63:off] : a[off+63:off]
ELSE
dst[i+63:i] := 0
FI
ENDFOR
dst[MAX:256] := 0