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    //! AES New Instructions (AES-NI)
    //!
    //! The intrinsics here correspond to those in the `wmmintrin.h` C header.
    //!
    //! The reference is [Intel 64 and IA-32 Architectures Software Developer's
    //! Manual Volume 2: Instruction Set Reference, A-Z][intel64_ref].
    //!
    //! [intel64_ref]: http://www.intel.de/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-instruction-set-reference-manual-325383.pdf

    use coresimd::x86::__m128i;

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

    #[allow(improper_ctypes)]
    extern "C" {
        #[link_name = "llvm.x86.aesni.aesdec"]
        fn aesdec(a: __m128i, round_key: __m128i) -> __m128i;
        #[link_name = "llvm.x86.aesni.aesdeclast"]
        fn aesdeclast(a: __m128i, round_key: __m128i) -> __m128i;
        #[link_name = "llvm.x86.aesni.aesenc"]
        fn aesenc(a: __m128i, round_key: __m128i) -> __m128i;
        #[link_name = "llvm.x86.aesni.aesenclast"]
        fn aesenclast(a: __m128i, round_key: __m128i) -> __m128i;
        #[link_name = "llvm.x86.aesni.aesimc"]
        fn aesimc(a: __m128i) -> __m128i;
        #[link_name = "llvm.x86.aesni.aeskeygenassist"]
        fn aeskeygenassist(a: __m128i, imm8: u8) -> __m128i;
    }

    /// Perform one round of an AES decryption flow on data (state) in `a`.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_aesdec_si128)
    #[inline]
    #[target_feature(enable = "aes")]
    #[cfg_attr(test, assert_instr(aesdec))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_aesdec_si128(a: __m128i, round_key: __m128i) -> __m128i {
        aesdec(a, round_key)
    }

    /// Perform the last round of an AES decryption flow on data (state) in `a`.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_aesdeclast_si128)
    #[inline]
    #[target_feature(enable = "aes")]
    #[cfg_attr(test, assert_instr(aesdeclast))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_aesdeclast_si128(a: __m128i, round_key: __m128i) -> __m128i {
        aesdeclast(a, round_key)
    }

    /// Perform one round of an AES encryption flow on data (state) in `a`.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_aesenc_si128)
    #[inline]
    #[target_feature(enable = "aes")]
    #[cfg_attr(test, assert_instr(aesenc))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_aesenc_si128(a: __m128i, round_key: __m128i) -> __m128i {
        aesenc(a, round_key)
    }

    /// Perform the last round of an AES encryption flow on data (state) in `a`.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_aesenclast_si128)
    #[inline]
    #[target_feature(enable = "aes")]
    #[cfg_attr(test, assert_instr(aesenclast))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_aesenclast_si128(a: __m128i, round_key: __m128i) -> __m128i {
        aesenclast(a, round_key)
    }

    /// Perform the `InvMixColumns` transformation on `a`.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_aesimc_si128)
    #[inline]
    #[target_feature(enable = "aes")]
    #[cfg_attr(test, assert_instr(aesimc))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_aesimc_si128(a: __m128i) -> __m128i {
        aesimc(a)
    }

    /// Assist in expanding the AES cipher key.
    ///
    /// Assist in expanding the AES cipher key by computing steps towards
    /// generating a round key for encryption cipher using data from `a` and an
    /// 8-bit round constant `imm8`.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_aeskeygenassist_si128)
    #[inline]
    #[target_feature(enable = "aes")]
    #[cfg_attr(test, assert_instr(aeskeygenassist, imm8 = 0))]
    #[rustc_args_required_const(1)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_aeskeygenassist_si128(a: __m128i, imm8: i32) -> __m128i {
        macro_rules! call {
            ($imm8:expr) => {
                aeskeygenassist(a, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    #[cfg(test)]
    mod tests {
        // The constants in the tests below are just bit patterns. They should not
        // be interpreted as integers; signedness does not make sense for them, but
        // __m128i happens to be defined in terms of signed integers.
        #![allow(overflowing_literals)]

        use stdsimd_test::simd_test;

        use coresimd::x86::*;

        #[simd_test(enable = "aes")]
        unsafe fn test_mm_aesdec_si128() {
            // Constants taken from https://msdn.microsoft.com/en-us/library/cc664949.aspx.
            let a = _mm_set_epi64x(0x0123456789abcdef, 0x8899aabbccddeeff);
            let k = _mm_set_epi64x(0x1133557799bbddff, 0x0022446688aaccee);
            let e = _mm_set_epi64x(0x044e4f5176fec48f, 0xb57ecfa381da39ee);
            let r = _mm_aesdec_si128(a, k);
            assert_eq_m128i(r, e);
        }

        #[simd_test(enable = "aes")]
        unsafe fn test_mm_aesdeclast_si128() {
            // Constants taken from https://msdn.microsoft.com/en-us/library/cc714178.aspx.
            let a = _mm_set_epi64x(0x0123456789abcdef, 0x8899aabbccddeeff);
            let k = _mm_set_epi64x(0x1133557799bbddff, 0x0022446688aaccee);
            let e = _mm_set_epi64x(0x36cad57d9072bf9e, 0xf210dd981fa4a493);
            let r = _mm_aesdeclast_si128(a, k);
            assert_eq_m128i(r, e);
        }

        #[simd_test(enable = "aes")]
        unsafe fn test_mm_aesenc_si128() {
            // Constants taken from https://msdn.microsoft.com/en-us/library/cc664810.aspx.
            let a = _mm_set_epi64x(0x0123456789abcdef, 0x8899aabbccddeeff);
            let k = _mm_set_epi64x(0x1133557799bbddff, 0x0022446688aaccee);
            let e = _mm_set_epi64x(0x16ab0e57dfc442ed, 0x28e4ee1884504333);
            let r = _mm_aesenc_si128(a, k);
            assert_eq_m128i(r, e);
        }

        #[simd_test(enable = "aes")]
        unsafe fn test_mm_aesenclast_si128() {
            // Constants taken from https://msdn.microsoft.com/en-us/library/cc714136.aspx.
            let a = _mm_set_epi64x(0x0123456789abcdef, 0x8899aabbccddeeff);
            let k = _mm_set_epi64x(0x1133557799bbddff, 0x0022446688aaccee);
            let e = _mm_set_epi64x(0xb6dd7df25d7ab320, 0x4b04f98cf4c860f8);
            let r = _mm_aesenclast_si128(a, k);
            assert_eq_m128i(r, e);
        }

        #[simd_test(enable = "aes")]
        unsafe fn test_mm_aesimc_si128() {
            // Constants taken from https://msdn.microsoft.com/en-us/library/cc714195.aspx.
            let a = _mm_set_epi64x(0x0123456789abcdef, 0x8899aabbccddeeff);
            let e = _mm_set_epi64x(0xc66c82284ee40aa0, 0x6633441122770055);
            let r = _mm_aesimc_si128(a);
            assert_eq_m128i(r, e);
        }

        #[simd_test(enable = "aes")]
        unsafe fn test_mm_aeskeygenassist_si128() {
            // Constants taken from https://msdn.microsoft.com/en-us/library/cc714138.aspx.
            let a = _mm_set_epi64x(0x0123456789abcdef, 0x8899aabbccddeeff);
            let e = _mm_set_epi64x(0x857c266b7c266e85, 0xeac4eea9c4eeacea);
            let r = _mm_aeskeygenassist_si128(a, 5);
            assert_eq_m128i(r, e);
        }
    }

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