| x_ptr | x vector input. 24bit integers unpacked. |
| y_ptr | y vector input. 24bit integers unpacked. |
| a_scalar | Pointer to "a" scalar value. 24bit integers unpacked. |
| b_scalar | Pointer to "b" scalar value. 24bit integers unpacked. |
| out_ptr | output vector. 24bit integers unpacked, no extra stride, and rounded by rounding_bits. output can overlap either or both inputs. |
| length | Number of elements in the vectors (data samples). Must be a multiple of 2, at least 4, and no greater than 512. Does not include the stride. |
| rounding_bits | Number of bits to round the output by. 0 => no rounding, maximum of 31. |