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...ich is written in assembly and it is not defined in current module. IPRA's scope is limited to a module so for such externally defined function it uses default calling convention but here as the function is written in assembly user can provide exact register usage detials. So we dicided to mark declration of such function with __attribute__((regmask("clobbered list here"))) so LLVM can construct regmask out of it and use it with IPRA to improve register allocation. For this purpose I added support for this attribute in clang and clang codegen this attribute as target dependent attribute a...