decode 66c8000000 [ENTER_2 imm4:0x0]
decode 66c8000f00 [ENTER_2 imm4:0xf00]
decode 66c8000001 [ENTER_2 imm4:0x10000]
decode32 c8000000 [ENTER_4 imm4:0x0]
decode32 c8000f00 [ENTER_4 imm4:0xf00]
decode32 c8000001 [ENTER_4 imm4:0x10000]
decode64 c8000000 [ENTER_8 imm4:0x0]
decode64 c8000f00 [ENTER_8 imm4:0xf00]
decode64 c8000001 [ENTER_8 imm4:0x10000]