> FWICT, the auxiliary vector for HWCAPS is no longer really used and 
> applications (including glibc, gcc runtime code) have to resort to methods 
> like this instead. GCC's `__builtin_cpu_supports` does unfortunately not 
> support all features needed to detect these levels properly.

What feature do you miss? Note that using `__builtin_cpu_supports` would be 
much cleaner code and it's supported also by LLVM.

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