Vector Negate

void riscv_negate_f32(const float32_t *pSrc, float32_t *pDst, uint32_t blockSize)
void riscv_negate_q15(const q15_t *pSrc, q15_t *pDst, uint32_t blockSize)
void riscv_negate_q31(const q31_t *pSrc, q31_t *pDst, uint32_t blockSize)
void riscv_negate_q7(const q7_t *pSrc, q7_t *pDst, uint32_t blockSize)
group BasicNegate

Negates the elements of a vector.

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.

Functions

void riscv_negate_f32(const float32_t *pSrc, float32_t *pDst, uint32_t blockSize)

Negates the elements of a floating-point vector.

Return

none

Parameters
  • [in] pSrc: points to input vector.

  • [out] pDst: points to output vector.

  • [in] blockSize: number of samples in each vector.

void riscv_negate_q15(const q15_t *pSrc, q15_t *pDst, uint32_t blockSize)

Negates the elements of a Q15 vector.

Return

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.

Parameters
  • [in] pSrc: points to the input vector.

  • [out] pDst: points to the output vector.

  • [in] blockSize: number of samples in each vector.

void riscv_negate_q31(const q31_t *pSrc, q31_t *pDst, uint32_t blockSize)

Negates the elements of a Q31 vector.

Return

none

Scaling and Overflow Behavior

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

Parameters
  • [in] pSrc: points to the input vector.

  • [out] pDst: points to the output vector.

  • [in] blockSize: number of samples in each vector.

void riscv_negate_q7(const q7_t *pSrc, q7_t *pDst, uint32_t blockSize)

Negates the elements of a Q7 vector.

Return

none

Scaling and Overflow Behavior

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

Parameters
  • [in] pSrc: points to the input vector.

  • [out] pDst: points to the output vector.

  • [in] blockSize: number of samples in each vector.