_mm256_mask_permutex2var_epi64
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
immintrin.h
Instruction
VPERMT2Q ymm {k}, ymm, ymm
Synopsis
 _mm256_mask_permutex2var_epi64(__m256i a, __mmask8 k, __m256i idx, __m256i b);
Description
Shuffle 64-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 3
	i := j*64
	off := idx[i+1:i]*64
	IF k[j]
		dst[i+63:i] := idx[i+2] ? b[off+63:off] : a[off+63:off]
	ELSE
		dst[i+63:i] := a[i+63:i]
	FI
ENDFOR
dst[MAX:256] := 0