Liu <proljc@gmail.com> writes: > I changed FIXED_REGISTERS into 0, FIXED_REGISTERS into 1, > CALL_REALLY_USED_REGISTERS into 1. > > build and test it, but I still get the same error. Have you updated HARD_REGNO_MODE_OK? I encourage you to carefully read the gcc internals manual. It's pretty good on this kind of thing. Ian