Vector Summation

Functions
q63_t	csky_dsp_lib_vec_sum16 (q15_t *A, uint32_t N)
	Q15 vector summation. More...
q63_t	csky_dsp_lib_vec_sum31 (q31_t *A, uint32_t N)
	Q31 vector summation. More...

Description

Compute the summation of all the elements of the Vector, the computaional process is:

for(i = 0; i < N; i++)
{
  result += *(A+i);
}

support for q15 and q31 format.

Function Documentation

q63_t csky_dsp_lib_vec_sum16	(	q15_t *	A,
		uint32_t	N
	)

Parameters

[in]	*A	points to the input buffer
[in]	N	number of samples in each vector

Returns

the summation result

Scaling and Overflow Behavior:

The function is realized by multiply-accumulate instruction, and the accumulator used here is Q63 format, so, there is enough guard bits. And the out put is in Q63 format.

q63_t csky_dsp_lib_vec_sum31	(	q31_t *	A,
		uint32_t	N
	)

Parameters

[in]	*A	points to the input buffer
[in]	N	number of samples in each vector

Returns

the summation result

Scaling and Overflow Behavior:

The function is realized by multiply-accumulate instruction, and the accumulator used here is Q63 format, so, there is enough guard bits. And the out put is in Q63 format.