Motorola DSP Developer's Kit

max-2c.asm

[ X ] = mot###_max( X, Y )

Description

This function returns the largest elements taken from complex vector X or Y

Input/Output

Input: Complex Vector X (include real part Xr and imaginary part Xi), Complex Vector Y (include real part Yr and imaginary part Yi)

Output: Complex Vector X (include real part Xr and imaginary Xi)

Algorithm

for(i=0; i<size; i++)
{
    xValue = Xr[i]* Xr[i] + Xi[i]* Xi[i];
    yValue = Yr[i]* Yr[i] + Yi[i]* Yi[i];
    if(xValue < yValue)
        X[i] = Y[i];
}

Memory & Register

Start address of Vector X is in P:$F000

Start address of Vector Y is in P:$F001

Start address of result Vector is also in P:$F000

Register R7 stores the number of items in the array

Status Register

The assembly function max-2c.asm does not explicitly set any status registers/bits during the function execution.

Data Size Limit

The length of input vectors can't be larger than the continuous available data memory size.

Data Range Limit

Input data vector X range [-1.0, +1.0]

Precision

In the case of DSP563, precision is 23 bits.

In the case of DSP566, precision is 15 bits.

max-2r.asm

mean-r.asm