Vector Negate

Functions
void	arm_negate_f32 (const float32_t *pSrc, float32_t *pDst, uint32_t blockSize)
	Negates the elements of a floating-point vector. More...
void	arm_negate_q15 (const q15_t *pSrc, q15_t *pDst, uint32_t blockSize)
	Negates the elements of a Q15 vector. More...
void	arm_negate_q31 (const q31_t *pSrc, q31_t *pDst, uint32_t blockSize)
	Negates the elements of a Q31 vector. More...
void	arm_negate_q7 (const q7_t *pSrc, q7_t *pDst, uint32_t blockSize)
	Negates the elements of a Q7 vector. More...

Description

Negates the elements of a vector.

    pDst[n] = -pSrc[n],   0 <= n < blockSize.

The functions support in-place computation allowing the source and destination pointers to reference the same memory buffer. There are separate functions for floating-point, Q7, Q15, and Q31 data types.

Function Documentation

void arm_negate_f32	(	const float32_t *	pSrc,
		float32_t *	pDst,
		uint32_t	blockSize
	)

Parameters

[in]	pSrc	points to input vector.
[out]	pDst	points to output vector.
[in]	blockSize	number of samples in each vector.

Returns

none

void arm_negate_q15	(	const q15_t *	pSrc,
		q15_t *	pDst,
		uint32_t	blockSize
	)

Parameters

[in]	pSrc	points to the input vector.
[out]	pDst	points to the output vector.
[in]	blockSize	number of samples in each vector.

Returns

none

Conditions for optimum performance

Input and output buffers should be aligned by 32-bit

Scaling and Overflow Behavior

The function uses saturating arithmetic. The Q15 value -1 (0x8000) is saturated to the maximum allowable positive value 0x7FFF.

void arm_negate_q31	(	const q31_t *	pSrc,
		q31_t *	pDst,
		uint32_t	blockSize
	)

Parameters

[in]	pSrc	points to the input vector.
[out]	pDst	points to the output vector.
[in]	blockSize	number of samples in each vector.

Returns

none

Scaling and Overflow Behavior

The function uses saturating arithmetic. The Q31 value -1 (0x80000000) is saturated to the maximum allowable positive value 0x7FFFFFFF.

void arm_negate_q7	(	const q7_t *	pSrc,
		q7_t *	pDst,
		uint32_t	blockSize
	)

Parameters

[in]	pSrc	points to the input vector.
[out]	pDst	points to the output vector.
[in]	blockSize	number of samples in each vector.

Returns

none

Scaling and Overflow Behavior

The function uses saturating arithmetic. The Q7 value -1 (0x80) is saturated to the maximum allowable positive value 0x7F.