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

    #[allow(improper_ctypes)]
    extern "unadjusted" {
        #[link_name = "llvm.x86.addcarry.64"]
        fn llvm_addcarry_u64(a: u8, b: u64, c: u64) -> (u8, u64);
        #[link_name = "llvm.x86.addcarryx.u64"]
        fn llvm_addcarryx_u64(a: u8, b: u64, c: u64, d: *mut u8) -> u8;
        #[link_name = "llvm.x86.subborrow.64"]
        fn llvm_subborrow_u64(a: u8, b: u64, c: u64) -> (u8, u64);
    }

    /// Adds unsigned 64-bit integers `a` and `b` with unsigned 8-bit carry-in `c_in`
    /// (carry flag), and store the unsigned 64-bit result in `out`, and the carry-out
    /// is returned (carry or overflow flag).
    #[inline]
    #[cfg_attr(test, assert_instr(adc))]
    #[stable(feature = "simd_x86_adx", since = "1.33.0")]
    pub unsafe fn _addcarry_u64(c_in: u8, a: u64, b: u64, out: &mut u64) -> u8 {
        let (a, b) = llvm_addcarry_u64(c_in, a, b);
        *out = b;
        a
    }

    /// Adds unsigned 64-bit integers `a` and `b` with unsigned 8-bit carry-in `c_in`
    /// (carry or overflow flag), and store the unsigned 64-bit result in `out`, and
    /// the carry-out is returned (carry or overflow flag).
    #[inline]
    #[target_feature(enable = "adx")]
    #[cfg_attr(test, assert_instr(adc))]
    #[stable(feature = "simd_x86_adx", since = "1.33.0")]
    pub unsafe fn _addcarryx_u64(c_in: u8, a: u64, b: u64, out: &mut u64) -> u8 {
        llvm_addcarryx_u64(c_in, a, b, out as *mut _ as *mut u8)
    }

    /// Adds unsigned 64-bit integers `a` and `b` with unsigned 8-bit carry-in `c_in`.
    /// (carry or overflow flag), and store the unsigned 64-bit result in `out`, and
    /// the carry-out is returned (carry or overflow flag).
    #[inline]
    #[cfg_attr(test, assert_instr(sbb))]
    #[stable(feature = "simd_x86_adx", since = "1.33.0")]
    pub unsafe fn _subborrow_u64(c_in: u8, a: u64, b: u64, out: &mut u64) -> u8 {
        let (a, b) = llvm_subborrow_u64(c_in, a, b);
        *out = b;
        a
    }

    #[cfg(test)]
    mod tests {
        use stdarch_test::simd_test;

        use crate::core_arch::x86_64::*;

        #[test]
        fn test_addcarry_u64() {
            unsafe {
                let a = u64::MAX;
                let mut out = 0;

                let r = _addcarry_u64(0, a, 1, &mut out);
                assert_eq!(r, 1);
                assert_eq!(out, 0);

                let r = _addcarry_u64(0, a, 0, &mut out);
                assert_eq!(r, 0);
                assert_eq!(out, a);

                let r = _addcarry_u64(1, a, 1, &mut out);
                assert_eq!(r, 1);
                assert_eq!(out, 1);

                let r = _addcarry_u64(1, a, 0, &mut out);
                assert_eq!(r, 1);
                assert_eq!(out, 0);

                let r = _addcarry_u64(0, 3, 4, &mut out);
                assert_eq!(r, 0);
                assert_eq!(out, 7);

                let r = _addcarry_u64(1, 3, 4, &mut out);
                assert_eq!(r, 0);
                assert_eq!(out, 8);
            }
        }

        #[simd_test(enable = "adx")]
        unsafe fn test_addcarryx_u64() {
            let a = u64::MAX;
            let mut out = 0;

            let r = _addcarry_u64(0, a, 1, &mut out);
            assert_eq!(r, 1);
            assert_eq!(out, 0);

            let r = _addcarry_u64(0, a, 0, &mut out);
            assert_eq!(r, 0);
            assert_eq!(out, a);

            let r = _addcarry_u64(1, a, 1, &mut out);
            assert_eq!(r, 1);
            assert_eq!(out, 1);

            let r = _addcarry_u64(1, a, 0, &mut out);
            assert_eq!(r, 1);
            assert_eq!(out, 0);

            let r = _addcarry_u64(0, 3, 4, &mut out);
            assert_eq!(r, 0);
            assert_eq!(out, 7);

            let r = _addcarry_u64(1, 3, 4, &mut out);
            assert_eq!(r, 0);
            assert_eq!(out, 8);
        }

        #[test]
        fn test_subborrow_u64() {
            unsafe {
                let a = u64::MAX;
                let mut out = 0;

                let r = _subborrow_u64(0, 0, 1, &mut out);
                assert_eq!(r, 1);
                assert_eq!(out, a);

                let r = _subborrow_u64(0, 0, 0, &mut out);
                assert_eq!(r, 0);
                assert_eq!(out, 0);

                let r = _subborrow_u64(1, 0, 1, &mut out);
                assert_eq!(r, 1);
                assert_eq!(out, a - 1);

                let r = _subborrow_u64(1, 0, 0, &mut out);
                assert_eq!(r, 1);
                assert_eq!(out, a);

                let r = _subborrow_u64(0, 7, 3, &mut out);
                assert_eq!(r, 0);
                assert_eq!(out, 4);

                let r = _subborrow_u64(1, 7, 3, &mut out);
                assert_eq!(r, 0);
                assert_eq!(out, 3);
            }
        }
    }