From: Kees Cook
> Sent: 09 March 2022 22:10
>
> Unfortunately, Clang did not have support for "sp" as a global register
> definition, and was crashing after the addition of current_stack_pointer.
> This has been fixed in Clang 15, but earlier Clang versions need to
^^ 14
> avoid this code, so add a versioned test and revert back to the
> open-coded asm instances. Fixes Clang build error:
>
> fatal error: error in backend: Invalid register name global variable
David
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