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 *   - SSE2
 *   - ARM NEON
 *   - WebAssembly SIMD128
 *   - POWER8 VSX
 *   - s390x ZVector
 * This can be controlled via the @ref XXH_VECTOR macro, but it automatically
 * selects the best version according to predefined macros. For the x86 family, an
 * automatic runtime dispatcher is included separately in @ref xxh_x86dispatch.c.
 *
 * XXH3 implementation is portable:
 * it has a generic C90 formulation that can be compiled on any platform,
 * all implementations generate exactly the same hash value on all platforms.
 * Starting from v0.8.0, it's also labelled "stable", meaning that
 * any future version will also generate the same hash value.
 *
 * XXH3 offers 2 variants, _64bits and _128bits.
 *
 * When only 64 bits are needed, prefer invoking the _64bits variant, as it
 * reduces the amount of mixing, resulting in faster speed on small inputs.
 * It's also generally simpler to manipulate a scalar return type than a struct.
 *