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Arithmetic library functions

PM0014

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5.6.2

mVM_q15_q15_q15

void mVM_q15_q15_q15 (short Mat[][], short *Vectin, int N, short *Output).

Description:

Real 16-bit fractional [N*N] [N*1] matrix multiply. The result vector is

on 1.15 format.

Argument:

Mat

Pointer to matrix.

Vectin

Pointer to input vector.

Size of the squared matrix and size of vectors.

Output

Pointer to result vector.

Algorithm:

Output (i) =

Mat(i, k) x Vectin(k)

Note:

Matrix and Vector should be stored in the DPRAM.

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

or respectively lower than -1.

Assembly source

code:

mVM_q15_q15_q15.asm

Code size and cycles: Size: 60 bytes

Instruction cycles: N2 + 10N - 10

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,

mat_10_10.in and vect_10_1.in contains respectively a

Matrix[10][10] and a vector [10][1]. The 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...

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