7.53 .irpc symbol,values…

Evaluate a sequence of statements assigning different values to symbol. The sequence of statements starts at the line following the .irpc directive, and is terminated by an .endr directive. For each character in each (possibly double quoted) values, symbol is set to the character, and the sequence of statements is assembled. If no values is listed, the sequence of statements is assembled once, with symbol set to the null string. To refer to symbol within the sequence of statements, use \symbol.

For example, assembling

        .irpc    param,123
        move    d\param,sp@-
        .endr

is equivalent to assembling

        move    d1,sp@-
        move    d2,sp@-
        move    d3,sp@-

For some caveats with the spelling of symbol, see also the discussion at See .macro.