_mm256_mask_permutex2var_epi8
Classification
AVX-512, Swizzle, CPUID Test: AVX512_VBMI
Header File
Instruction
VPERMT2B ymm {k}, ymm, ymm
Synopsis
_mm256_mask_permutex2var_epi8(__m256i a, __mmask32 k, __m256i idx, __m256i b);
Description
Shuffle 8-bit integers 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 31
i := j*8
IF k[j]
off := 8*idx[i+4:i]
dst[i+7:i] := idx[i+5] ? b[off+7:off] : a[off+7:off]
ELSE
dst[i+7:i] := a[i+7:i]
FI
ENDFOR
dst[MAX:256] := 0