Arm VERSION 1.2 Instrukcja Użytkownika Pobierz pdf (Strona 312)

100

101

Directives Reference

7.4.4 IF, ELSE, and ENDIF

The

directive introduces a condition that is used to decide whether to assemble a

sequence of instructions and/or directives.

[

is a synonym for

The

ELSE

directive marks the beginning of a sequence of instructions and/or directives

that you want to be assembled if the preceding condition fails.

is a synonym for

ELSE

The

ENDIF

directive marks the end of a sequence of instructions and/or directives that

you want to be conditionally assembled.

]

is a synonym for

ENDIF

Syntax

IF logical-expression

...

{ELSE

...}

ENDIF

where:

logical-expression

is an expression that evaluates to either

{TRUE}

{FALSE}

See Relational operators on page 3-30.

Usage

Use

with

ENDIF

, and optionally with

ELSE

, for sequences of instructions and/or

directives that are only to be assembled or acted on under a specified condition.

IF...ENDIF

conditions can be nested (see Nesting directives on page 7-26).

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