_mm_fmsubadd_pd
Classification
AVX_ALL, Arithmetic, CPUID Test: FMA
Header File
Instruction
VFMSUBADD132PD xmm, xmm, xmm
Synopsis
_mm_fmsubadd_pd(__m128d a, __m128d b, __m128d c);
Description
Multiply packed double-precision (64-bit) floating-point elements in "a" and "b", alternatively subtract and add packed elements in "c" from/to the intermediate result, and store the results in "dst".
Operation
FOR j := 0 to 1
i := j*64
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
ENDFOR
dst[MAX:128] := 0