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.... Firstly, in PEI::CalculateCalleeSavedRegisters() in CodeGen/ PrologEpilogInserter.cpp, the call to Fn.getRegInfo().isPhysRegUsed(Reg) always seems to return true for the all of the XMM registers if the Function being emitted makes any function calls whatsoever, and so it tries to save all thecallee-saved XMM registers even when none are actually used. Further, the prolog/epilog emitter doesn't know how to correctly save and restore the XMM registers on the stack. If outputting assembly, it tries to emit "PUSH XMM6" and such; no such instruction exists, and this does n...