--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Florian Weimer from comment #1)
> GCC already has this as __builtin_cpu_supports. Why isn't that sufficient?
> GCC support is desirable so that GCC can turn the expression into a true
> value at compile time if the CPU feature is required by the current
> compilation environment.
__builtin_cpu_supports only supports a subset of <cpu-features.h>.
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