_mm256_mask_permutexvar_pd
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
immintrin.h
Instruction
VPERMPD ymm {k}, ymm, ymm
Synopsis
 _mm256_mask_permutexvar_pd(__m256d src, __mmask8 k, __m256i idx, __m256d a);
Description
Shuffle double-precision (64-bit) floating-point elements in "a" across lanes using the corresponding index in "idx", and store the results in "dst" using writemask "k" (elements are copied from "src" when the corresponding mask bit is not set).
Operation
FOR j := 0 to 3
	i := j*64
	id := idx[i+1:i]*64
	IF k[j]
		dst[i+63:i] := a[id+63:id]
	ELSE
		dst[i+63:i] := src[i+63:i]
	FI
ENDFOR
dst[MAX:256] := 0