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> I almost change all the instruction formats. It was a huge work. I am going > to compile and run it now. We have done the similar work[1] on this topic by gcc and we have start migrate our platform to LLVM. In my experience, you need to take care the follow part: * ARMBaseRegisterInfo::getRegPressureLimit * ARMBaseRegisterInfo::getRawAllocationOrder * CalleeSavedRegs *

I almost change all the instruction formats. It was a huge work. I am going to compile and run it now. Best Regards, A. Yazdanbakhsh >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> PhD. Student School of Electrical and Computer Engineering University of Wisconsin-Madison E-mail: yazdanbakhsh