Luminyx1 wrote:

> Is explicitly listing out all the possible combinations of registers the best 
> way to do this? See shouldDisableRetRegFromCSR in 
> llvm/lib/Target/X86/X86ISelLoweringCall.cpp .

Is this possible to do in `getCalleeSavedRegs` as it uses a SaveList array 
rather than a mask which can be modified dynamically?

https://github.com/llvm/llvm-project/pull/175145
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