_mm512_fmaddsub_round_pd
Classification
AVX-512, Arithmetic, CPUID Test: AVX512F
Header File
Instruction
VFMADDSUB132PD zmm, zmm, zmm {er}
Synopsis
_mm512_fmaddsub_round_pd(__m512d a, __m512d b, __m512d c, const int rounding);
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".
[round_note]
Operation
FOR j := 0 to 7
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:512] := 0