Right Shift

Functions
__ALWAYS_INLINE q31_t	csky_shr_q31 (q31_t a, q31_t shift)
	right shift Q31 version More...
__ALWAYS_INLINE q31_t	csky_pshr_q31 (q31_t a, q31_t shift)
	right shift Q31 version More...
__ALWAYS_INLINE q31_t	csky_pshr_pos_q31 (q31_t a, q31_t shift)
	right shift Q31 version More...
__ALWAYS_INLINE q63_t	csky_pshr_q63 (q63_t a, q31_t shift)
	right shift Q63 version More...

Description

Shift the input value to right with appointed bits, its basic format is:

    a = (a) >> (shift),   1 =< shift <= bitof(a) - 1.

The basic format is only designed for q31.

and the extended format should be rounding to +inf:

    a = (a + (1<<(shift - 1)) >> (shift),   1 =< shift <= bitof(a) - 1.

which are designed for q31, q31 positive and q63.

Function Documentation

__ALWAYS_INLINE q31_t csky_pshr_pos_q31	(	q31_t	a,
		q31_t	shift
	)

Parameters

[in]	a	input positive value to be shift.
[in]	shift	input positive value, the number of bits to be shift.
[out]	result	the shifted a.

Scaling and Overflow Behavior:

The function is only used for right shift. So, the value of shift is between[1,31]. And the output value is rounding to +inf.

__ALWAYS_INLINE q31_t csky_pshr_q31	(	q31_t	a,
		q31_t	shift
	)

Parameters

[in]	a	input value to be shift.
[in]	shift	input positive value, the number of bits to be shift.
[out]	result	the shifted a.

Scaling and Overflow Behavior:

The function is only used for right shift. So, the value of shift is between[1,31]. And the output value is rounding to +inf.

__ALWAYS_INLINE q63_t csky_pshr_q63	(	q63_t	a,
		q31_t	shift
	)

Parameters

[in]	a	input value to be shift.
[in]	shift	input positive value, the number of bits to be shift.
[out]	result	the shifted a.

Scaling and Overflow Behavior:

The function is only used for right shift. So, the value of shift is between[1,63]. And the output value is rounding to +inf.

__ALWAYS_INLINE q31_t csky_shr_q31	(	q31_t	a,
		q31_t	shift
	)

Parameters

[in]	a	input value to be shift.
[in]	shift	input positive value, the number of bits to be shift.
[out]	result	the shifted a.

Scaling and Overflow Behavior:

The function is only used for right shift. So, the value of shift is between[1,31].