_mm256_fmsubadd_pd
Classification
AVX_ALL, Arithmetic, CPUID Test: FMA
Header File
Instruction
VFMSUBADD132PD ymm, ymm, ymm
Synopsis
_mm256_fmsubadd_pd(__m256d a, __m256d b, __m256d 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 3
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:256] := 0