U4_20
[U4_20] = { 4, 20, 0 },
[INSTR_RRF_0UFF] = { F_24, F_28, U4_20, 0, 0, 0 },
[INSTR_RRF_0URF] = { R_24, F_28, U4_20, 0, 0, 0 },
[INSTR_RRF_FFRU] = { F_24, F_16, R_28, U4_20, 0, 0 },
[INSTR_RRF_FUFF] = { F_24, F_16, F_28, U4_20, 0, 0 },
[INSTR_RRF_FUFF2] = { F_24, F_28, F_16, U4_20, 0, 0 },
[INSTR_RRF_RURR] = { R_24, R_28, R_16, U4_20, 0, 0 },
[INSTR_RRF_RURR2] = { R_24, R_16, R_28, U4_20, 0, 0 },
[INSTR_RRF_UUFF] = { F_24, U4_16, F_28, U4_20, 0, 0 },
[INSTR_RRF_UUFR] = { F_24, U4_16, R_28, U4_20, 0, 0 },
[INSTR_RRF_UURF] = { R_24, U4_16, F_28, U4_20, 0, 0 },
[INSTR_VRR_VVVU0UV] = { V_8, V_12, V_16, V_32, U4_28, U4_20 },
[INSTR_VRR_VVVU0V] = { V_8, V_12, V_16, V_32, U4_20, 0 },
[INSTR_VRR_VVVUU0V] = { V_8, V_12, V_16, V_32, U4_20, U4_24 },