Matrix Subtraction

Subtract two matrices. More...

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. More...
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. More...
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. More...
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. More...
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. More...

Detailed Description

Subtract two matrices.

Subraction of two 3 x 3 matrices

\[ \begin{pmatrix} a_{1,1} & a_{1,2} & a_{1,3} \\ a_{2,1} & a_{2,2} & a_{2,3} \\ a_{3,1} & a_{3,2} & a_{3,3} \\ \end{pmatrix} - \begin{pmatrix} b_{1,1} & b_{1,2} & b_{1,3} \\ b_{2,1} & b_{2,2} & b_{2,3} \\ b_{3,1} & b_{3,2} & b_{3,3} \\ \end{pmatrix} = \begin{pmatrix} a_{1,1}-b_{1,1} & a_{1,2}-b_{1,2} & a_{1,3}-b_{1,3} \\ a_{2,1}-b_{2,1} & a_{2,2}-b_{2,2} & a_{2,3}-b_{2,3} \\ a_{3,1}-b_{3,1} & a_{3,2}-b_{3,2} & a_{3,3}-b_{3,3} \\ \end{pmatrix} \]

The functions check to make sure that pSrcA, pSrcB, and pDst have the same number of rows and columns.

Function Documentation

riscv_mat_sub_f16()

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

[in]	pSrcA	points to the first input matrix structure
[in]	pSrcB	points to the second input matrix structure
[out]	pDst	points to output matrix structure

Returns

execution status

• RISCV_MATH_SUCCESS : Operation successful
• RISCV_MATH_SIZE_MISMATCH : Matrix size check failed

riscv_mat_sub_f32()

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

[in]	pSrcA	points to the first input matrix structure
[in]	pSrcB	points to the second input matrix structure
[out]	pDst	points to output matrix structure

Returns

execution status

• RISCV_MATH_SUCCESS : Operation successful
• RISCV_MATH_SIZE_MISMATCH : Matrix size check failed

riscv_mat_sub_f64()

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

[in]	pSrcA	points to the first input matrix structure
[in]	pSrcB	points to the second input matrix structure
[out]	pDst	points to output matrix structure

Returns

execution status

• RISCV_MATH_SUCCESS : Operation successful
• RISCV_MATH_SIZE_MISMATCH : Matrix size check failed

riscv_mat_sub_q15()

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.

Parameters

[in]	pSrcA	points to the first input matrix structure
[in]	pSrcB	points to the second input matrix structure
[out]	pDst	points to output matrix structure

Returns

execution status

• RISCV_MATH_SUCCESS : Operation successful
• RISCV_MATH_SIZE_MISMATCH : Matrix size check failed

Scaling and Overflow Behavior

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

riscv_mat_sub_q31()

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.

Parameters

[in]	pSrcA	points to the first input matrix structure
[in]	pSrcB	points to the second input matrix structure
[out]	pDst	points to output matrix structure

Returns

execution status

• RISCV_MATH_SUCCESS : Operation successful
• RISCV_MATH_SIZE_MISMATCH : Matrix size check failed

Scaling and Overflow Behavior

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