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    //! ARM intrinsics.
    //!
    //! The reference for NEON is [ARM's NEON Intrinsics Reference][arm_ref]. The
    //! [ARM's NEON Intrinsics Online Database][arm_dat] is also useful.
    //!
    //! [arm_ref]: http://infocenter.arm.com/help/topic/com.arm.doc.ihi0073a/IHI0073A_arm_neon_intrinsics_ref.pdf
    //! [arm_dat]: https://developer.arm.com/technologies/neon/intrinsics
    #![allow(non_camel_case_types)]

    mod armclang;

    pub use self::armclang::*;

    #[cfg(any(target_feature = "mclass", dox))]
    mod cmsis;
    #[cfg(any(target_feature = "mclass", dox))]
    pub use self::cmsis::*;

    mod v6;
    pub use self::v6::*;

    #[cfg(any(target_arch = "aarch64", target_feature = "v7"))]
    mod v7;
    #[cfg(any(target_arch = "aarch64", target_feature = "v7"))]
    pub use self::v7::*;

    #[cfg(any(all(target_feature = "v7", not(target_feature = "mclass")), dox))]
    mod dsp;
    #[cfg(any(all(target_feature = "v7", not(target_feature = "mclass")), dox))]
    pub use self::dsp::*;

    // NEON is supported on AArch64, and on ARM when built with the v7 and neon
    // features. Building ARM without neon produces incorrect codegen.
    #[cfg(any(
        target_arch = "aarch64",
        all(target_feature = "v7", target_feature = "neon"),
        dox
    ))]
    mod neon;
    #[cfg(any(
        target_arch = "aarch64",
        all(target_feature = "v7", target_feature = "neon"),
        dox
    ))]
    pub use self::neon::*;

    #[cfg(test)]
    use stdsimd_test::assert_instr;

    /// Generates the trap instruction `UDF`
    #[cfg(target_arch = "arm")]
    #[cfg_attr(test, assert_instr(udf))]
    #[inline]
    pub unsafe fn udf() -> ! {
        ::intrinsics::abort()
    }

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