_mm256_shuffle_epi8
Classification
AVX_ALL, Swizzle, CPUID Test: AVX2
Header File
immintrin.h
Instruction
VPSHUFB ymm, ymm, ymm
Synopsis
 _mm256_shuffle_epi8(__m256i a, __m256i b);
Description
Shuffle 8-bit integers in "a" within 128-bit lanes according to shuffle control mask in the corresponding 8-bit element of "b", and store the results in "dst".
Operation
FOR j := 0 to 15
	i := j*8
	IF b[i+7] == 1
		dst[i+7:i] := 0
	ELSE
		index[3:0] := b[i+3:i]
		dst[i+7:i] := a[index*8+7:index*8]
	FI
	IF b[128+i+7] == 1
		dst[128+i+7:128+i] := 0
	ELSE
		index[3:0] := b[128+i+3:128+i]
		dst[128+i+7:128+i] := a[128+index*8+7:128+index*8]
	FI
ENDFOR
dst[MAX:256] := 0