米6体育平台手机版

SLAU131V October 2004 – February 2020

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5.7 Directives that Enable Conditional Assembly

Conditional assembly directives enable you to instruct the assembler to assemble certain sections of code according to a true or false evaluation of an expression. Two sets of directives allow you to assemble conditional blocks of code:

The .if/.elseif/.else/.endif directives tell the assembler to conditionally assemble a block of code according to the evaluation of an expression.
	.if condition	marks the beginning of a conditional block and assembles code if the .if condition is true.
	[.elseif condition]	marks a block of code to be assembled if the .if condition is false and the .elseif condition is true.
	.else	marks a block of code to be assembled if the .if condition is false and any .elseif conditions are false.
	.endif	marks the end of a conditional block and terminates the block.
The .loop/.break/.endloop directives tell the assembler to repeatedly assemble a block of code according to the evaluation of an expression.
	.loop [count]	marks the beginning of a repeatable block of code. The optional expression evaluates to the loop count.
	.break [end condition]	tells the assembler to assemble repeatedly when the .break end condition is false and to go to the code immediately after .endloop when the expression is true or omitted.
	.endloop	marks the end of a repeatable block.
The assembler supports several relational operators that are useful for conditional expressions. For more information about relational operators, see Section 4.9.2.