_mm512_mask_extractf64x2_pd
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512DQ
Header File
immintrin.h
Instruction
VEXTRACTF64X2 xmm {k}, zmm, imm8
Synopsis
 _mm512_mask_extractf64x2_pd(__m128d src, __mmask8 k, __m512d a, int imm8);
Description
Extract 128 bits (composed of 2 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[1:0] OF
0: tmp[127:0] := a[127:0]
1: tmp[127:0] := a[255:128]
2: tmp[127:0] := a[383:256]
3: tmp[127:0] := a[511:384]
ESAC
FOR j := 0 to 1
	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:128] := 0