Void_Star <praveen_athimon@xxxxxxxxxxxxxx> writes: > Also, I have come across this macro CONDITIONAL_REGISTER_USAGE which modify > fixed_regs and call_used_regs to 1 for each of the registers in the classes > which should not be used by GCC. > (http://gcc.gnu.org/onlinedocs/gccint/Register-Basics.html#Register-Basics > ). But I do not have idea as how to and where to have this macro. Could any > of you please help me out? You are looking at the gcc internals manual. That is a macro in the gcc source code. You can change it in your gcc sources, in this case by changing the function rs6000_conditional_register_usage in gcc/config/rs6000/rs6000.c. Then you can rebuild gcc. However, I would recommend using the -ffixed-REG options you listed. That seems much simpler and will work with every version of gcc, not just the ones you build yourself. Ian
