Matrix Subtraction

RISCV_DSP_ATTRIBUTE riscv_status riscv_mat_sub_f16 (const riscv_matrix_instance_f16 *pSrcA, const riscv_matrix_instance_f16 *pSrcB, riscv_matrix_instance_f16 *pDst)
RISCV_DSP_ATTRIBUTE riscv_status riscv_mat_sub_f32 (const riscv_matrix_instance_f32 *pSrcA, const riscv_matrix_instance_f32 *pSrcB, riscv_matrix_instance_f32 *pDst)
RISCV_DSP_ATTRIBUTE riscv_status riscv_mat_sub_f64 (const riscv_matrix_instance_f64 *pSrcA, const riscv_matrix_instance_f64 *pSrcB, riscv_matrix_instance_f64 *pDst)
RISCV_DSP_ATTRIBUTE riscv_status riscv_mat_sub_q15 (const riscv_matrix_instance_q15 *pSrcA, const riscv_matrix_instance_q15 *pSrcB, riscv_matrix_instance_q15 *pDst)
RISCV_DSP_ATTRIBUTE riscv_status riscv_mat_sub_q31 (const riscv_matrix_instance_q31 *pSrcA, const riscv_matrix_instance_q31 *pSrcB, riscv_matrix_instance_q31 *pDst)
group MatrixSub

Subtract two matrices.

\[\begin{split} \begin{pmatrix} a_{1,1} & a_{1,2} & a_{1,3} \\ a_{2,1} & a_{2,2} & a_{2,3} \\ a_{3,1} & a_{3,2} & a_{3,3} \\ \end{pmatrix} - \begin{pmatrix} b_{1,1} & b_{1,2} & b_{1,3} \\ b_{2,1} & b_{2,2} & b_{2,3} \\ b_{3,1} & b_{3,2} & b_{3,3} \\ \end{pmatrix} = \begin{pmatrix} a_{1,1}-b_{1,1} & a_{1,2}-b_{1,2} & a_{1,3}-b_{1,3} \\ a_{2,1}-b_{2,1} & a_{2,2}-b_{2,2} & a_{2,3}-b_{2,3} \\ a_{3,1}-b_{3,1} & a_{3,2}-b_{3,2} & a_{3,3}-b_{3,3} \\ \end{pmatrix} \end{split}\]
The functions check to make sure that pSrcA, pSrcB, and pDst have the same number of rows and columns.
Subraction of two 3 x 3 matrices

Functions

RISCV_DSP_ATTRIBUTE riscv_status riscv_mat_sub_f16 (const riscv_matrix_instance_f16 *pSrcA, const riscv_matrix_instance_f16 *pSrcB, riscv_matrix_instance_f16 *pDst)

Floating-point matrix subtraction.

Parameters

  • pSrcA – [in] points to the first input matrix structure

  • pSrcB – [in] points to the second input matrix structure

  • pDst – [out] points to output matrix structure

Returns

execution status

  • RISCV_MATH_SUCCESS : Operation successful

  • RISCV_MATH_SIZE_MISMATCH : Matrix size check failed

RISCV_DSP_ATTRIBUTE riscv_status riscv_mat_sub_f32 (const riscv_matrix_instance_f32 *pSrcA, const riscv_matrix_instance_f32 *pSrcB, riscv_matrix_instance_f32 *pDst)

Floating-point matrix subtraction.

Parameters

  • pSrcA – [in] points to the first input matrix structure

  • pSrcB – [in] points to the second input matrix structure

  • pDst – [out] points to output matrix structure

Returns

execution status

  • RISCV_MATH_SUCCESS : Operation successful

  • RISCV_MATH_SIZE_MISMATCH : Matrix size check failed

RISCV_DSP_ATTRIBUTE riscv_status riscv_mat_sub_f64 (const riscv_matrix_instance_f64 *pSrcA, const riscv_matrix_instance_f64 *pSrcB, riscv_matrix_instance_f64 *pDst)

Floating-point matrix subtraction.

Parameters

  • pSrcA – [in] points to the first input matrix structure

  • pSrcB – [in] points to the second input matrix structure

  • pDst – [out] points to output matrix structure

Returns

execution status

  • RISCV_MATH_SUCCESS : Operation successful

  • RISCV_MATH_SIZE_MISMATCH : Matrix size check failed

RISCV_DSP_ATTRIBUTE riscv_status riscv_mat_sub_q15 (const riscv_matrix_instance_q15 *pSrcA, const riscv_matrix_instance_q15 *pSrcB, riscv_matrix_instance_q15 *pDst)

Q15 matrix subtraction.

Scaling and Overflow Behavior

The function uses saturating arithmetic. Results outside of the allowable Q15 range [0x8000 0x7FFF] are saturated.

Parameters

  • pSrcA – [in] points to the first input matrix structure

  • pSrcB – [in] points to the second input matrix structure

  • pDst – [out] points to output matrix structure

Returns

execution status

  • RISCV_MATH_SUCCESS : Operation successful

  • RISCV_MATH_SIZE_MISMATCH : Matrix size check failed

RISCV_DSP_ATTRIBUTE riscv_status riscv_mat_sub_q31 (const riscv_matrix_instance_q31 *pSrcA, const riscv_matrix_instance_q31 *pSrcB, riscv_matrix_instance_q31 *pDst)

Q31 matrix subtraction.

Scaling and Overflow Behavior

The function uses saturating arithmetic. Results outside of the allowable Q31 range [0x80000000 0x7FFFFFFF] are saturated.

Parameters

  • pSrcA – [in] points to the first input matrix structure

  • pSrcB – [in] points to the second input matrix structure

  • pDst – [out] points to output matrix structure

Returns

execution status

  • RISCV_MATH_SUCCESS : Operation successful

  • RISCV_MATH_SIZE_MISMATCH : Matrix size check failed