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    //! Aarch64 run-time features.

    #[macro_export]
    #[unstable(feature = "stdsimd", issue = "27731")]
    #[allow_internal_unstable]
    macro_rules! is_aarch64_feature_detected {
        ("neon") => {
            // FIXME: this should be removed once we rename Aarch64 neon to asimd
            cfg!(target_feature = "neon") ||
                $crate::arch::detect::check_for($crate::arch::detect::Feature::asimd)
        };
        ("asimd") => {
            cfg!(target_feature = "neon") ||
                $crate::arch::detect::check_for($crate::arch::detect::Feature::asimd)
        };
        ("pmull") => {
            cfg!(target_feature = "pmull") ||
                $crate::arch::detect::check_for($crate::arch::detect::Feature::pmull)
        };
        ("fp") => {
            cfg!(target_feature = "fp") ||
                $crate::arch::detect::check_for($crate::arch::detect::Feature::fp)
        };
        ("fp16") => {
            cfg!(target_feature = "fp16") ||
                $crate::arch::detect::check_for($crate::arch::detect::Feature::fp16)
        };
        ("sve") => {
            cfg!(target_feature = "sve") ||
                $crate::arch::detect::check_for($crate::arch::detect::Feature::sve)
        };
        ("crc") => {
            cfg!(target_feature = "crc") ||
                $crate::arch::detect::check_for($crate::arch::detect::Feature::crc)
        };
        ("crypto") => {
            cfg!(target_feature = "crypto") ||
                $crate::arch::detect::check_for($crate::arch::detect::Feature::crypto)
        };
        ("lse") => {
            cfg!(target_feature = "lse") ||
                $crate::arch::detect::check_for($crate::arch::detect::Feature::lse)
        };
        ("rdm") => {
            cfg!(target_feature = "rdm") ||
                $crate::arch::detect::check_for($crate::arch::detect::Feature::rdm)
        };
        ("rcpc") => {
            cfg!(target_feature = "rcpc") ||
                $crate::arch::detect::check_for($crate::arch::detect::Feature::rcpc)
        };
        ("dotprod") => {
            cfg!(target_feature = "dotprod") ||
                $crate::arch::detect::check_for($crate::arch::detect::Feature::dotprod)
        };
        ("ras") => {
            compile_error!("\"ras\" feature cannot be detected at run-time")
        };
        ("v8.1a") => {
            compile_error!("\"v8.1a\" feature cannot be detected at run-time")
        };
        ("v8.2a") => {
            compile_error!("\"v8.2a\" feature cannot be detected at run-time")
        };
        ("v8.3a") => {
            compile_error!("\"v8.3a\" feature cannot be detected at run-time")
        };
        ($t:tt) => { compile_error!(concat!("unknown aarch64 target feature: ", $t)) };
    }

    /// ARM Aarch64 CPU Feature enum. Each variant denotes a position in a bitset
    /// for a particular feature.
    ///
    /// PLEASE: do not use this, it is an implementation detail subject to change.
    #[doc(hidden)]
    #[allow(non_camel_case_types)]
    #[repr(u8)]
    #[unstable(feature = "stdsimd_internal", issue = "0")]
    pub enum Feature {
        /// ARM Advanced SIMD (ASIMD)
        asimd,
        /// Polynomial Multiply
        pmull,
        /// Floating point support
        fp,
        /// Half-float support.
        fp16,
        /// Scalable Vector Extension (SVE)
        sve,
        /// CRC32 (Cyclic Redundancy Check)
        crc,
        /// Crypto: AES + PMULL + SHA1 + SHA2
        crypto,
        /// Atomics (Large System Extension)
        lse,
        /// Rounding Double Multiply (ASIMDRDM)
        rdm,
        /// Release consistent Processor consistent (RcPc)
        rcpc,
        /// Vector Dot-Product (ASIMDDP)
        dotprod,
    }

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