Panasonic MN1030 user manual 7 opt, Opt on Opt off

Chapter 9 Writing Machine Language Instructions and Directive Statements

9.4.7opt

Syntax

label	operation	operand
	opt	on off

Default settings

If omitted, opt off will be assumed.

Functional description

This directive enables and disables the optimization functions of the assembler and linker.

The optimization applies only to conditional and unconditional branch instructions. The optimization function evaluates how the source statements are coded, and converts them to the optimal code with the linker.

While the linker is linking multiple files, it outputs the instructions with the smallest possible code size for the instructions subject to optimization.

Refer to chapter 4, "Optimization", for details.

NOTE:	The -Od assembler option disables the optimization function, however,
	optimization will be enabled if opt on is coded in the source file

Operand coding rules

The strings that can be coded for the operand and their meanings are as follows.

opt	on	Enables optimization.
opt	off	Disables optimization.

Usage example

Below is an example use of the opt directive.

opt on

opt off

Writing Directive Statements 163