DIF_OP_SUB
dt_cg_arithmetic_op(dnp, dlp, drp, DIF_OP_SUB);
dt_cg_arithmetic_op(dnp, dlp, drp, DIF_OP_SUB);
dt_cg_prearith_op(dnp, dlp, drp, DIF_OP_SUB);
dt_cg_postarith_op(dnp, dlp, drp, DIF_OP_SUB);
instr = DIF_INSTR_FMT(DIF_OP_SUB, DIF_REG_R0,
case DIF_OP_SUB:
case DIF_OP_SUB:
case DIF_OP_SUB: