Clearing Registers - Motorola DSP56600 Manual

Application optimization for digital signal processors

Table of Contents

7.4.3

Clearing Registers

It is often needed to clear a certain register or accumulator in the

code. Optimization can be accomplished in this area, also. Example:

move

This example can be optimized by using the CLR instructions and

by combining a move instruction with the CLR to a parallel opcode:

clr

move

Another example:

add

clr

move

This can be optimized by:

add

move

MOTOROLA

Optimizing DSP56300/DSP56600 Applications

r1,r0

#0,a

y0,a0

r1,r0

y0,a0

x0,a

y0,b0

x0,a

#0,b

y0,b0

Compact Opcode Use

Special Instructions

7-9

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Dsp56300