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    extern "C" {
        #[link_name = "llvm.aarch64.crc32b"]
        fn crc32b_(crc: u32, data: u32) -> u32;
        #[link_name = "llvm.aarch64.crc32h"]
        fn crc32h_(crc: u32, data: u32) -> u32;
        #[link_name = "llvm.aarch64.crc32w"]
        fn crc32w_(crc: u32, data: u32) -> u32;
        #[link_name = "llvm.aarch64.crc32x"]
        fn crc32x_(crc: u32, data: u64) -> u32;

        #[link_name = "llvm.aarch64.crc32cb"]
        fn crc32cb_(crc: u32, data: u32) -> u32;
        #[link_name = "llvm.aarch64.crc32ch"]
        fn crc32ch_(crc: u32, data: u32) -> u32;
        #[link_name = "llvm.aarch64.crc32cw"]
        fn crc32cw_(crc: u32, data: u32) -> u32;
        #[link_name = "llvm.aarch64.crc32cx"]
        fn crc32cx_(crc: u32, data: u64) -> u32;
    }

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

    /// CRC32 single round checksum for bytes (8 bits).
    #[inline]
    #[target_feature(enable = "crc")]
    #[cfg_attr(test, assert_instr(crc32b))]
    pub unsafe fn __crc32b(crc: u32, data: u8) -> u32 {
        crc32b_(crc, data as u32)
    }

    /// CRC32 single round checksum for half words (16 bits).
    #[inline]
    #[target_feature(enable = "crc")]
    #[cfg_attr(test, assert_instr(crc32h))]
    pub unsafe fn __crc32h(crc: u32, data: u16) -> u32 {
        crc32h_(crc, data as u32)
    }

    /// CRC32 single round checksum for words (32 bits).
    #[inline]
    #[target_feature(enable = "crc")]
    #[cfg_attr(test, assert_instr(crc32w))]
    pub unsafe fn __crc32w(crc: u32, data: u32) -> u32 {
        crc32w_(crc, data)
    }

    /// CRC32 single round checksum for quad words (64 bits).
    #[inline]
    #[target_feature(enable = "crc")]
    #[cfg_attr(test, assert_instr(crc32x))]
    pub unsafe fn __crc32d(crc: u32, data: u64) -> u32 {
        crc32x_(crc, data)
    }

    /// CRC32-C single round checksum for bytes (8 bits).
    #[inline]
    #[target_feature(enable = "crc")]
    #[cfg_attr(test, assert_instr(crc32cb))]
    pub unsafe fn __crc32cb(crc: u32, data: u8) -> u32 {
        crc32cb_(crc, data as u32)
    }

    /// CRC32-C single round checksum for half words (16 bits).
    #[inline]
    #[target_feature(enable = "crc")]
    #[cfg_attr(test, assert_instr(crc32ch))]
    pub unsafe fn __crc32ch(crc: u32, data: u16) -> u32 {
        crc32ch_(crc, data as u32)
    }

    /// CRC32-C single round checksum for words (32 bits).
    #[inline]
    #[target_feature(enable = "crc")]
    #[cfg_attr(test, assert_instr(crc32cw))]
    pub unsafe fn __crc32cw(crc: u32, data: u32) -> u32 {
        crc32cw_(crc, data)
    }

    /// CRC32-C single round checksum for quad words (64 bits).
    #[inline]
    #[target_feature(enable = "crc")]
    #[cfg_attr(test, assert_instr(crc32cx))]
    pub unsafe fn __crc32cd(crc: u32, data: u64) -> u32 {
        crc32cx_(crc, data)
    }

    #[cfg(test)]
    mod tests {
        use coresimd::aarch64::*;
        use coresimd::simd::*;
        use std::mem;
        use stdsimd_test::simd_test;

        #[simd_test(enable = "crc")]
        unsafe fn test_crc32b() {
            assert_eq!(__crc32b(0, 0), 0);
            assert_eq!(__crc32b(0, 255), 755167117);
        }

        #[simd_test(enable = "crc")]
        unsafe fn test_crc32h() {
            assert_eq!(__crc32h(0, 0), 0);
            assert_eq!(__crc32h(0, 16384), 1994146192);
        }

        #[simd_test(enable = "crc")]
        unsafe fn test_crc32w() {
            assert_eq!(__crc32w(0, 0), 0);
            assert_eq!(__crc32w(0, 4294967295), 3736805603);
        }

        #[simd_test(enable = "crc")]
        unsafe fn test_crc32d() {
            assert_eq!(__crc32d(0, 0), 0);
            assert_eq!(__crc32d(0, 18446744073709551615), 1147535477);
        }

        #[simd_test(enable = "crc")]
        unsafe fn test_crc32cb() {
            assert_eq!(__crc32cb(0, 0), 0);
            assert_eq!(__crc32cb(0, 255), 2910671697);
        }

        #[simd_test(enable = "crc")]
        unsafe fn test_crc32ch() {
            assert_eq!(__crc32ch(0, 0), 0);
            assert_eq!(__crc32ch(0, 16384), 1098587580);
        }

        #[simd_test(enable = "crc")]
        unsafe fn test_crc32cw() {
            assert_eq!(__crc32cw(0, 0), 0);
            assert_eq!(__crc32cw(0, 4294967295), 3080238136);
        }

        #[simd_test(enable = "crc")]
        unsafe fn test_crc32cd() {
            assert_eq!(__crc32cd(0, 0), 0);
            assert_eq!(__crc32cd(0, 18446744073709551615), 3293575501);
        }

    }

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