Vector Negate

RISCV_DSP_ATTRIBUTE void riscv_negate_f16 (const float16_t *pSrc, float16_t *pDst, uint32_t blockSize)
RISCV_DSP_ATTRIBUTE void riscv_negate_f32 (const float32_t *pSrc, float32_t *pDst, uint32_t blockSize)
RISCV_DSP_ATTRIBUTE void riscv_negate_f64 (const float64_t *pSrc, float64_t *pDst, uint32_t blockSize)
RISCV_DSP_ATTRIBUTE void riscv_negate_q15 (const q15_t *pSrc, q15_t *pDst, uint32_t blockSize)
RISCV_DSP_ATTRIBUTE void riscv_negate_q31 (const q31_t *pSrc, q31_t *pDst, uint32_t blockSize)
RISCV_DSP_ATTRIBUTE 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

RISCV_DSP_ATTRIBUTE void riscv_negate_f16 (const float16_t *pSrc, float16_t *pDst, uint32_t blockSize)

Negates the elements of a floating-point vector.

Parameters

  • pSrc – [in] points to input vector.

  • pDst – [out] points to output vector.

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

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

Negates the elements of a floating-point vector.

Parameters

  • pSrc – [in] points to input vector.

  • pDst – [out] points to output vector.

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

RISCV_DSP_ATTRIBUTE void riscv_negate_f64 (const float64_t *pSrc, float64_t *pDst, uint32_t blockSize)

Negates the elements of a floating-point vector.

Parameters

  • pSrc – [in] points to input vector.

  • pDst – [out] points to output vector.

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

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

Negates the elements of a Q15 vector.

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

  • pSrc – [in] points to the input vector.

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

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

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

Negates the elements of a Q31 vector.

Scaling and Overflow Behavior

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

Parameters

  • pSrc – [in] points to the input vector.

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

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

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

Negates the elements of a Q7 vector.

Scaling and Overflow Behavior

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

Parameters

  • pSrc – [in] points to the input vector.

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

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