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Unary operators

Unary operators return a string, numeric, or logical value. They have higher precedence than other operators and are evaluated first.

unary operator precedes its operand. Adjacent operators are evaluated from right to left.

The following table lists the unary operators that return strings:

Table 12-1 Unary operators that return strings

Operator

Usage

Description

:CHR:

:CHR:A

Returns the character with ASCII code A.

:LOWERCASE: :LOWERCASE:string Returns the given string, with all uppercase characters converted to lowercase.
:REVERSE_CC: :REVERSE_CC:cond_code Returns the inverse of the condition code in cond_code, or an error if cond_code does not contain a valid condition code.

:STR:

:STR:A

In A32 and T32 code, returns an 8-digit hexadecimal string corresponding to a numeric expression, or the string "T" or "F"" if used on a logical expression. In A64 code, returns a 16-digit hexadecimal string.

:UPPERCASE: :UPPERCASE:string Returns the given string, with all lowercase characters converted to uppercase.

The following table lists the unary operators that return numeric values:

Table 12-2 Unary operators that return numeric or logical values

Operator Usage Description

?

?A

Number of bytes of code generated by line defining symbol A.

+ and -

+A

-A

Unary plus. Unary minus. + and – can act on numeric and PC-relative expressions.

:BASE:

:BASE:A

If A is a PC-relative or register-relative expression, :BASE: returns the number of its register component. :BASE: is most useful in macros.

:CC_ENCODING: :CC_ENCODING:cond_code Returns the numeric value of the condition code in cond_code, or an error if cond_code does not contain a valid condition code.

:DEF:

:DEF:A

{TRUE} if A is defined, otherwise {FALSE}.

:INDEX:

:INDEX:A

If A is a register-relative expression, :INDEX: returns the offset from that base register. :INDEX: is most useful in macros.

:LEN:

:LEN:A

Length of string A.

:LNOT:

:LNOT:A

Logical complement of A.

:NOT:

:NOT:A

Bitwise complement of A (~ is an alias, for example ~A).

:RCONST: :RCONST:Rn Number of register. In A32/T32 code, 0-15 corresponds to R0-R15. In A64 code, 0-30 corresponds to W0-W30 or X0-X30.

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