Carrot added a comment. A reserved physical register doesn't mean it can't be used by compiler/linker, it just means it can't be used by register allocator, see the comments in TargetRegisterInfo::getReservedRegs(). The most common example is the stack pointer. So when we reserve X8, X16, X17 and X19, it means we can't allocate them to virtual registers, compiler/linker can still use X8 to pass return address, and use X16 and X17 in a veneer.
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