[clang] [llvm] [clang][llvm][PPC] PreserveAll attribute (PR #175145)

[via cfe-commits]

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