_mm256_mask_fmaddsub_pd
Classification
AVX-512, Arithmetic, CPUID Test: AVX512F
Header File
immintrin.h
Instruction
VFMADDSUB132PD ymm {k}, ymm, ymm
Synopsis
 _mm256_mask_fmaddsub_pd(__m256d a, __mmask8 k, __m256d b, __m256d c);
Description
Multiply packed double-precision (64-bit) floating-point elements in "a" and "b", alternatively add and subtract packed elements in "c" to/from the intermediate result, and store the results in "dst" using writemask "k" (elements are copied from "a" when the corresponding mask bit is not set).
Operation
FOR j := 0 to 3
	i := j*64
	IF k[j]
		IF ((j & 1) == 0) 
			dst[i+63:i] := (a[i+63:i] * b[i+63:i]) - c[i+63:i]
		ELSE
			dst[i+63:i] := (a[i+63:i] * b[i+63:i]) + c[i+63:i]
		FI
	ELSE
		dst[i+63:i] := a[i+63:i]
	FI
ENDFOR
dst[MAX:256] := 0