_mm512_mask_fmsubadd_round_pd
Classification
AVX-512, Arithmetic, CPUID Test: AVX512F
Header File
Instruction
VFMSUBADD132PD zmm {k}, zmm, zmm {er}
Synopsis
_mm512_mask_fmsubadd_round_pd(__m512d a, __mmask8 k, __m512d b, __m512d c, const int rounding);
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" using writemask "k" (elements are copied from "a" when the corresponding mask bit is not set). [round_note]
Operation
FOR j := 0 to 7
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:512] := 0