Expressions

The assembler uses 32-bit signed arithmetic to evaluates expressions; it does not check for arithmetic overflow.

As different processors use different operators, the assembler uses an expression syntax similar to that of the C language. Expressions use C operators and follow C rules for parentheses and associativity.

Note: To refer to the program counter in an expression, use a period (.), dollar sign ($), or asterisk (*).

Expression Operators lists the expression operators that the assembler supports.

Table 1. Expression Operators
Category	Operator	Description
Binary	+	add
	-	subtract
	*	multiply
	/	divide
	%	modulo
	\|\|	logical OR
	&&	logical AND
	\|	bitwise OR
	&	bitwise AND
	^	bitwise XOR
	<<	shift left
	>>	shift right (zeros are shifted into high order bits)
	==	equal to
	!=	not equal to
	<=	less than or equal to
	>=	greater than or equal to
	>=	greater than or equal to
	<	less than
	@	at
Unary	+	unary plus
	-	unary minus
	~	unary bitwise complement
Alternate	<>	not equal to
	%	modulo
	\|	logical OR
	\|\|	logical XOR

Operator precedence is:

unary + - ~
* / %
binary + -
<< >>
< <= > >=
== !=
&
^
| @
&&
||