_mm256_mask_expand_epi8
Classification
AVX-512, Swizzle, CPUID Test: AVX512_VBMI2
Header File
immintrin.h
Instruction
VPEXPANDB ymm {k}, ymm
Synopsis
 _mm256_mask_expand_epi8(__m256i src, __mmask32 k, __m256i 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 31
	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:256] := 0