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The IRP built-in macro is defined as follows:

IRP parm-name, <parm-list>


parm-name is the parameter name that is used in the macro-body. Each time the macro is expanded, subsequent values from the parm-list are used to replace parm-name in the macro-body.
parm-list is the list of parm-name replacement values.
macro-body is the text that is expanded when the macro is invoked.

For example:

IRP regnum, <R0,R1,R2,R3,R4>
        PUSH    A&regnum

expands as:

        PUSH    AR0
        PUSH    AR1
        PUSH    AR2
        PUSH    AR3
        PUSH    AR4
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