5.8.3 Irpc Directive

The .irpc symbol, value ... .endr directive evaluate a sequence of statements assigning different values to symbol. The sequence of statements starts at the .irpc directive, and is terminated by an .endr directive. For each character in value, symbol is set to the character, and the sequence of statements is assembled. If no value 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 reg,0123
lw $a\reg, 1032+\reg($sp)
.endr

is equivalent to assembling:

lw $a0,1032+0($sp)
lw $a1,1032+1($sp)
lw $a2,1032+2($sp)
lw $a3,1032+3($sp)