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    use crate::{
        core_arch::{simd::*, x86::*},
        mem::transmute,
    };

    #[allow(improper_ctypes)]
    extern "C" {
        #[link_name = "llvm.x86.sha1msg1"]
        fn sha1msg1(a: i32x4, b: i32x4) -> i32x4;
        #[link_name = "llvm.x86.sha1msg2"]
        fn sha1msg2(a: i32x4, b: i32x4) -> i32x4;
        #[link_name = "llvm.x86.sha1nexte"]
        fn sha1nexte(a: i32x4, b: i32x4) -> i32x4;
        #[link_name = "llvm.x86.sha1rnds4"]
        fn sha1rnds4(a: i32x4, b: i32x4, c: i8) -> i32x4;
        #[link_name = "llvm.x86.sha256msg1"]
        fn sha256msg1(a: i32x4, b: i32x4) -> i32x4;
        #[link_name = "llvm.x86.sha256msg2"]
        fn sha256msg2(a: i32x4, b: i32x4) -> i32x4;
        #[link_name = "llvm.x86.sha256rnds2"]
        fn sha256rnds2(a: i32x4, b: i32x4, k: i32x4) -> i32x4;
    }

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

    /// Performs an intermediate calculation for the next four SHA1 message values
    /// (unsigned 32-bit integers) using previous message values from `a` and `b`,
    /// and returning the result.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_sha1msg1_epu32)
    #[inline]
    #[target_feature(enable = "sha")]
    #[cfg_attr(test, assert_instr(sha1msg1))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_sha1msg1_epu32(a: __m128i, b: __m128i) -> __m128i {
        transmute(sha1msg1(a.as_i32x4(), b.as_i32x4()))
    }

    /// Performs the final calculation for the next four SHA1 message values
    /// (unsigned 32-bit integers) using the intermediate result in `a` and the
    /// previous message values in `b`, and returns the result.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_sha1msg2_epu32)
    #[inline]
    #[target_feature(enable = "sha")]
    #[cfg_attr(test, assert_instr(sha1msg2))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_sha1msg2_epu32(a: __m128i, b: __m128i) -> __m128i {
        transmute(sha1msg2(a.as_i32x4(), b.as_i32x4()))
    }

    /// Calculate SHA1 state variable E after four rounds of operation from the
    /// current SHA1 state variable `a`, add that value to the scheduled values
    /// (unsigned 32-bit integers) in `b`, and returns the result.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_sha1nexte_epu32)
    #[inline]
    #[target_feature(enable = "sha")]
    #[cfg_attr(test, assert_instr(sha1nexte))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_sha1nexte_epu32(a: __m128i, b: __m128i) -> __m128i {
        transmute(sha1nexte(a.as_i32x4(), b.as_i32x4()))
    }

    /// Performs four rounds of SHA1 operation using an initial SHA1 state (A,B,C,D)
    /// from `a` and some pre-computed sum of the next 4 round message values
    /// (unsigned 32-bit integers), and state variable E from `b`, and return the
    /// updated SHA1 state (A,B,C,D). `func` contains the logic functions and round
    /// constants.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_sha1rnds4_epu32)
    #[inline]
    #[target_feature(enable = "sha")]
    #[cfg_attr(test, assert_instr(sha1rnds4, func = 0))]
    #[rustc_args_required_const(2)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_sha1rnds4_epu32(a: __m128i, b: __m128i, func: i32) -> __m128i {
        let a = a.as_i32x4();
        let b = b.as_i32x4();
        macro_rules! call {
            ($imm2:expr) => {
                sha1rnds4(a, b, $imm2)
            };
        }
        let ret = constify_imm2!(func, call);
        transmute(ret)
    }

    /// Performs an intermediate calculation for the next four SHA256 message values
    /// (unsigned 32-bit integers) using previous message values from `a` and `b`,
    /// and return the result.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_sha256msg1_epu32)
    #[inline]
    #[target_feature(enable = "sha")]
    #[cfg_attr(test, assert_instr(sha256msg1))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_sha256msg1_epu32(a: __m128i, b: __m128i) -> __m128i {
        transmute(sha256msg1(a.as_i32x4(), b.as_i32x4()))
    }

    /// Performs the final calculation for the next four SHA256 message values
    /// (unsigned 32-bit integers) using previous message values from `a` and `b`,
    /// and return the result.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_sha256msg2_epu32)
    #[inline]
    #[target_feature(enable = "sha")]
    #[cfg_attr(test, assert_instr(sha256msg2))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_sha256msg2_epu32(a: __m128i, b: __m128i) -> __m128i {
        transmute(sha256msg2(a.as_i32x4(), b.as_i32x4()))
    }

    /// Performs 2 rounds of SHA256 operation using an initial SHA256 state
    /// (C,D,G,H) from `a`, an initial SHA256 state (A,B,E,F) from `b`, and a
    /// pre-computed sum of the next 2 round message values (unsigned 32-bit
    /// integers) and the corresponding round constants from `k`, and store the
    /// updated SHA256 state (A,B,E,F) in dst.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_sha256rnds2_epu32)
    #[inline]
    #[target_feature(enable = "sha")]
    #[cfg_attr(test, assert_instr(sha256rnds2))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_sha256rnds2_epu32(a: __m128i, b: __m128i, k: __m128i) -> __m128i {
        transmute(sha256rnds2(a.as_i32x4(), b.as_i32x4(), k.as_i32x4()))
    }

    #[cfg(test)]
    mod tests {
        use std::f32;
        use std::f64::{self, NAN};
        use std::i32;
        use std::mem::{self, transmute};

        use crate::core_arch::{simd::*, x86::*};
        use stdsimd_test::simd_test;
        use test::black_box; // Used to inhibit constant-folding.

        #[simd_test(enable = "sha")]
        #[allow(overflowing_literals)]
        unsafe fn test_mm_sha1msg1_epu32() {
            let a = _mm_set_epi64x(0xe9b5dba5b5c0fbcf, 0x71374491428a2f98);
            let b = _mm_set_epi64x(0xab1c5ed5923f82a4, 0x59f111f13956c25b);
            let expected = _mm_set_epi64x(0x98829f34f74ad457, 0xda2b1a44d0b5ad3c);
            let r = _mm_sha1msg1_epu32(a, b);
            assert_eq_m128i(r, expected);
        }

        #[simd_test(enable = "sha")]
        #[allow(overflowing_literals)]
        unsafe fn test_mm_sha1msg2_epu32() {
            let a = _mm_set_epi64x(0xe9b5dba5b5c0fbcf, 0x71374491428a2f98);
            let b = _mm_set_epi64x(0xab1c5ed5923f82a4, 0x59f111f13956c25b);
            let expected = _mm_set_epi64x(0xf714b202d863d47d, 0x90c30d946b3d3b35);
            let r = _mm_sha1msg2_epu32(a, b);
            assert_eq_m128i(r, expected);
        }

        #[simd_test(enable = "sha")]
        #[allow(overflowing_literals)]
        unsafe fn test_mm_sha1nexte_epu32() {
            let a = _mm_set_epi64x(0xe9b5dba5b5c0fbcf, 0x71374491428a2f98);
            let b = _mm_set_epi64x(0xab1c5ed5923f82a4, 0x59f111f13956c25b);
            let expected = _mm_set_epi64x(0x2589d5be923f82a4, 0x59f111f13956c25b);
            let r = _mm_sha1nexte_epu32(a, b);
            assert_eq_m128i(r, expected);
        }

        #[simd_test(enable = "sha")]
        #[allow(overflowing_literals)]
        unsafe fn test_mm_sha1rnds4_epu32() {
            let a = _mm_set_epi64x(0xe9b5dba5b5c0fbcf, 0x71374491428a2f98);
            let b = _mm_set_epi64x(0xab1c5ed5923f82a4, 0x59f111f13956c25b);
            let expected = _mm_set_epi64x(0x32b13cd8322f5268, 0xc54420862bd9246f);
            let r = _mm_sha1rnds4_epu32(a, b, 0);
            assert_eq_m128i(r, expected);

            let expected = _mm_set_epi64x(0x6d4c43e56a3c25d9, 0xa7e00fb775cbd3fe);
            let r = _mm_sha1rnds4_epu32(a, b, 1);
            assert_eq_m128i(r, expected);

            let expected = _mm_set_epi64x(0xb304e383c01222f4, 0x66f6b3b1f89d8001);
            let r = _mm_sha1rnds4_epu32(a, b, 2);
            assert_eq_m128i(r, expected);

            let expected = _mm_set_epi64x(0x8189b758bfabfa79, 0xdb08f6e78cae098b);
            let r = _mm_sha1rnds4_epu32(a, b, 3);
            assert_eq_m128i(r, expected);
        }

        #[simd_test(enable = "sha")]
        #[allow(overflowing_literals)]
        unsafe fn test_mm_sha256msg1_epu32() {
            let a = _mm_set_epi64x(0xe9b5dba5b5c0fbcf, 0x71374491428a2f98);
            let b = _mm_set_epi64x(0xab1c5ed5923f82a4, 0x59f111f13956c25b);
            let expected = _mm_set_epi64x(0xeb84973fd5cda67d, 0x2857b88f406b09ee);
            let r = _mm_sha256msg1_epu32(a, b);
            assert_eq_m128i(r, expected);
        }

        #[simd_test(enable = "sha")]
        #[allow(overflowing_literals)]
        unsafe fn test_mm_sha256msg2_epu32() {
            let a = _mm_set_epi64x(0xe9b5dba5b5c0fbcf, 0x71374491428a2f98);
            let b = _mm_set_epi64x(0xab1c5ed5923f82a4, 0x59f111f13956c25b);
            let expected = _mm_set_epi64x(0xb58777ce887fd851, 0x15d1ec8b73ac8450);
            let r = _mm_sha256msg2_epu32(a, b);
            assert_eq_m128i(r, expected);
        }

        #[simd_test(enable = "sha")]
        #[allow(overflowing_literals)]
        unsafe fn test_mm_sha256rnds2_epu32() {
            let a = _mm_set_epi64x(0xe9b5dba5b5c0fbcf, 0x71374491428a2f98);
            let b = _mm_set_epi64x(0xab1c5ed5923f82a4, 0x59f111f13956c25b);
            let k = _mm_set_epi64x(0, 0x12835b01d807aa98);
            let expected = _mm_set_epi64x(0xd3063037effb15ea, 0x187ee3db0d6d1d19);
            let r = _mm_sha256rnds2_epu32(a, b, k);
            assert_eq_m128i(r, expected);
        }
    }

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