_mm256_mask_fnmadd_pd
Classification
AVX-512, Arithmetic, CPUID Test: AVX512F
Header File
Instruction
VFNMADD132PD ymm {k}, ymm, ymm
Synopsis
_mm256_mask_fnmadd_pd(__m256d a, __mmask8 k, __m256d b, __m256d c);
Description
Multiply packed double-precision (64-bit) floating-point elements in "a" and "b", add the negated intermediate result to packed elements in "c", 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]
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]
FI
ENDFOR
dst[MAX:256] := 0