Vector Shift

Functions
void	csky_dsp_lib_vec_shf16 (q15_t *A, int8_t shift_val, uint32_t N, q15_t *C)
	Q15 vector shift. More...
void	csky_dsp_lib_vec_shf32 (q31_t *A, int8_t shift_val, uint32_t N, q31_t *C)
	Q31 vector shift. More...

Description

Shift every element of a input vector by a specified number of bits, the computaional process is:

    *(C+i) = *(A+i)  << shift,   0 <= i < N.

If shift_val is positive, then the elements will be shifted to left. And if shift_val is negative, then the elements will be shifted to right. Support for q15 and q31 format.

Function Documentation

void csky_dsp_lib_vec_shf16	(	q15_t *	A,
		int8_t	shift_val,
		uint32_t	N,
		q15_t *	C
	)

Parameters

[in]	*A	points to the input buffer a
[in]	shift_val	number of bits to be shift
[in]	N	number of samples in the vector
[out]	*C	points to the output buffer

Returns

none

Scaling and Overflow Behavior:

The function uses saturating arithmetic. The result will be saturated, so the output value is in the range of [0x8000, 0x7FFF].

void csky_dsp_lib_vec_shf32	(	q31_t *	A,
		int8_t	shift_val,
		uint32_t	N,
		q31_t *	C
	)

Parameters

[in]	*A	points to the input buffer a
[in]	shift_val	number of bits to be shift
[in]	N	number of samples in the vector
[out]	*C	points to the output buffer

Returns

none

Scaling and Overflow Behavior:

The function uses saturating arithmetic. The result will be saturated, so the output value is in the range of [0x80000000, 0x7FFFFFFF].