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

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

    /// Add 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
    }

    /// Add 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")]
    #[cfg(not(stage0))]
    pub unsafe fn _addcarryx_u64(c_in: u8, a: u64, b: u64, out: &mut u64) -> u8 {
        _addcarry_u64(c_in, a, b, out)
    }

    /// Add 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
    }

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