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PM0014

Arithmetic library functions

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5.6

Matrix multiply

5.6.1

mMul_q15_q15_q15

void mMul_q15_q15_q15 (short Mat1[][], int row1, int column1,

short Mat2[][], int column2, short Output[][]).

Description:

Real 16-bit fractional matrix multiply. The result matrix is on 1.15

format.

Argument:

Mat1

Pointer to matrix 1.

row1

Number of rows in matrix 1.

column1

Number of columns in matrix 1.

Mat2

Pointer to matrix 2.

column2

Number of columns in matrix 2.

Output

Pointer to result matrix

Algorithm:

Output (i, j) =

Mat1(1, k) x Mat2(k, j)

Note:

Matrix 1 and Matrix 2 should be stored in the DPRAM.

The output matrix saturates to 1 or -1 if the result is greater than 1

or respectively lower than -1.

Assembly source

code:

mMul_q15_q15_q15.asm

Code size and cycles: Size: 122 bytes

Instruction cycles: 40 + row1 * (6 + column2 * (8 + column1))

Test:

To test this function, two test cases are provided. Each test case

has two input vector files that contain the matrix to multiply and one

output vector file that contains the output matrix. For instance,

Mat1_4_3.in and Mat2_3_2.in contains respectively a Matrix[4][3]

and a Matrix [3][2]. Be aware that it is possible to multiply a

Matrix[4][3] by a Matrix [3][2] and not the inverse. An input file as

well as the output file contains the elements of the matrix sorted as

follows:

Op_row1_col1, Op_row1_col2, Op_row1_col3...

...Op_row2_col1,Op_row2_col2...

column1

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