how to prepend and suffixed an rtx with assembly lines, in a similar manner that it is possible to use fprintf (asm_out_file, "xxxx") to output assembly. ie: The below generate an rtx that access memory using the argument pointer register; and wherever that rtx is generated, I would like to have it surrounded by assembly lines for debugging purposes: rtx addr, mem; addr = plus_constant (Pmode, arg_pointer_rtx, 2 * UNITS_PER_WORD); mem = gen_rtx_MEM (Pmode, addr); Your response would be much appreciated.