pref_op          2203 arch/mips/kernel/mips-r2-to-r6-emul.c 	case pref_op:
pref_op           163 arch/mips/mm/uasm-mips.c 	[insn_pref]	= {M(pref_op, 0, 0, 0, 0, 0),  RS | RT | SIMM},