 
 
You can use variables in GASP to represent strings, registers, or the results of expressions.
You must distinguish two kinds of variables:
.EQU or .ASSIGN.  To evaluate this
kind of variable in your assembly output, simply mention its name.  For
example, these two lines define and use a variable `eg':
eg     .EQU   FLIP-64
       ...
       mov.l  eg,r0
Do not use this kind of variable in conditional expressions or while loops; GASP only evaluates these variables when writing assembly output.
.ASSIGNC or .ASSIGNA.  To evaluate this
kind of variable, write `\&' before the variable name; for example,
opcit  .ASSIGNA  47
       ...
       .AWHILE  \&opcit GT 0
       ...
       .AENDW
GASP treats macro arguments almost the same way, but to evaluate
them you use the prefix `\' rather than `\&'.
See Macros.
pvar .EQU expr
.EQU'
with the same pvar as often as you find it convenient.
pvar .ASSIGN expr
.EQU, save that you may not redefine
pvar using .ASSIGN once it has a value.
pvar .ASSIGNA aexpr
.ASSIGNA at any time.
pvar .ASSIGNC "str"
.ASSIGNC at any time.
pvar .REG (register)
.REG to define a variable that represents a register.  In
particular, register is not evaluated as an expression.
You may use .REG at will to redefine register variables.
All these directives accept the variable name in the ``label'' position,
that is at the left margin.  You may specify a colon after the variable
name if you wish; the first example above could have started `eg:'
with the same effect.
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