_mm512_mask_extractf64x4_pd
Classification
AVX-512, Swizzle, CPUID Test: AVX512F
Header File
immintrin.h
Instruction
VEXTRACTF64X4 ymm {k}, zmm, imm8
Synopsis
 _mm512_mask_extractf64x4_pd(__m256d src, __mmask8 k, __m512d a, int imm8);
Description
Extract 256 bits (composed of 4 packed double-precision (64-bit) floating-point elements) from "a", selected with "imm8", and store the results in "dst" using writemask "k" (elements are copied from "src" when the corresponding mask bit is not set).
Operation
CASE imm8[0] OF
0: tmp[255:0] := a[255:0]
1: tmp[255:0] := a[511:256]
ESAC
FOR j := 0 to 3
	i := j*64
	IF k[j]
		dst[i+63:i] := tmp[i+63:i]
	ELSE
		dst[i+63:i] := src[i+63:i]
	FI
ENDFOR
dst[MAX:256] := 0