_mm256_mask_permutex2var_pd
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
Instruction
VPERMT2PD ymm {k}, ymm, ymm
Synopsis
_mm256_mask_permutex2var_pd(__m256d a, __mmask8 k, __m256i idx, __m256d b);
Description
Shuffle double-precision (64-bit) floating-point elements in "a" and "b" across lanes using the corresponding selector and index in "idx", and store the results in "dst" using writemask "k" (elements are copied from "a" 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] := a[i+63:i]
FI
ENDFOR
dst[MAX:256] := 0