_mm_mask_expand_epi8
Classification
AVX-512, Swizzle, CPUID Test: AVX512_VBMI2
Header File
Instruction
VPEXPANDB xmm {k}, xmm
Synopsis
_mm_mask_expand_epi8(__m128i src, __mmask16 k, __m128i a);
Description
Load contiguous active 8-bit integers from "a" (those with their respective bit set in mask "k"), and store the results in "dst" using writemask "k" (elements are copied from "src" when the corresponding mask bit is not set).
Operation
m := 0
FOR j := 0 to 15
i := j*8
IF k[j]
dst[i+7:i] := a[m+7:m]
m := m + 8
ELSE
dst[i+7:i] := src[i+7:i]
FI
ENDFOR
dst[MAX:128] := 0