target:
        li  a0, 0x8001
        li  a0, 0x1f01
        li  a0, 0x12345001
        li  a0, 0xf2345001
        li  a0, 0xf12345001
        li  a0, 0xff00ff00ff001f01
        li  a0, 0x7ffffffff2345001
        li  a0, 0x7f0f243ff2345001