_mm256_mask_extracti64x2_epi64
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512DQ
Header File
immintrin.h
Instruction
VEXTRACTI64X2 xmm {k}, ymm, imm8
Synopsis
 _mm256_mask_extracti64x2_epi64(__m128i src, __mmask8 k, __m256i a, int imm8);
Description
Extract 128 bits (composed of 2 packed 64-bit integers) 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[127:0] := a[127:0]
1: tmp[127:0] := a[255:128]
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