PPC_OPERAND_PLUS1
{ 0x1f, 11, NULL, extract_nb, PPC_OPERAND_PLUS1 },
{ 0x1f, 11, insert_nbi, extract_nb, PPC_OPERAND_PLUS1 },
{ 0x1f, PPC_OPSHIFT_INV, insert_oimm, extract_oimm, PPC_OPERAND_PLUS1 },