_mm_mask_permutex2var_epi8
Classification
AVX-512, Swizzle, CPUID Test: AVX512_VBMI
Header File
Instruction
VPERMT2B xmm {k}, xmm, xmm
Synopsis
_mm_mask_permutex2var_epi8(__m128i a, __mmask16 k, __m128i idx, __m128i b);
Description
Shuffle 8-bit integers in "a" and "b" 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 15
i := j*8
IF k[j]
off := 8*idx[i+3:i]
dst[i+7:i] := idx[i+4] ? b[off+7:off] : a[off+7:off]
ELSE
dst[i+7:i] := a[i+7:i]
FI
ENDFOR
dst[MAX:128] := 0