Lexical operator for obtaining the integer register number
    associated with a symbol.

    Format

      %IREG  (symbol)

1  –  Argument

 symbol

    The single argument, of type string, specifies a symbol that may
    or may not be currently defined as an integer register symbol.

2  –  Description

    %IREG returns the decimal number of the integer register when
    the specified symbol is defined as an integer register symbol.
    Otherwise, %IREG returns 32.

3  –  Example

            ; Is SRC_REG the same as SP?
            .IF EQ, <%IREG(SRC_REG)>, <%IREG(SP)>

      If SRC_REG has been defined as integer register R16, the
      statements appear as follows after lexical processing:

            ; Is SRC_REG the same as SP?
            .IF EQ, <16>, <30>