[Bug string/19261] test-string.h questionable pointer arithmetic

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19261

--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Jakub Jelinek from comment #1)
> Bet you should just
>   extern impl_t *stop;
>   __asm ("" : "=g" (stop) : "0" (__stop_impls));
> and use stop instead of __stop_impls or something similar to hide it from
> the optimizers.

I was planning to compute the difference in uintptr_t.

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