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...e counter-argument is that most usage of the named register extension is already target specific (together with everything around it), so that extra value is very limited. Also, since kernel and library code (heavy users of named registers) will have to support old compilers, this will *have* to be ifdefd anyway. The arguments against builtins are that named register is more generic, is already in use for more than the stack pointer and is reasonably straightforward to both understand and implement. Both builtins and named registers don't give you the guarantees that you would like from such a...