_mm256_mask_insertf64x2
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512DQ
Header File
immintrin.h
Instruction
VINSERTF64X2 ymm {k}, ymm, xmm, imm8
Synopsis
 _mm256_mask_insertf64x2(__m256d src, __mmask8 k, __m256d a, __m128d b, int imm8);
Description
Copy "a" to "tmp", then insert 128 bits (composed of 2 packed double-precision (64-bit) floating-point elements) from "b" into "tmp" at the location specified by "imm8". Store "tmp" to "dst" using writemask "k" (elements are copied from "src" when the corresponding mask bit is not set).
Operation
tmp[255:0] := a[255:0]
CASE (imm8[0]) OF
0: tmp[127:0] := b[127:0]
1: tmp[255:128] := b[127:0]
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