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    //! `x86_64` Streaming SIMD Extensions (SSE)

    use crate::core_arch::x86::*;

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

    #[allow(improper_ctypes)]
    extern "C" {
        #[link_name = "llvm.x86.sse.cvtss2si64"]
        fn cvtss2si64(a: __m128) -> i64;
        #[link_name = "llvm.x86.sse.cvttss2si64"]
        fn cvttss2si64(a: __m128) -> i64;
        #[link_name = "llvm.x86.sse.cvtsi642ss"]
        fn cvtsi642ss(a: __m128, b: i64) -> __m128;
    }

    /// Converts the lowest 32 bit float in the input vector to a 64 bit integer.
    ///
    /// The result is rounded according to the current rounding mode. If the result
    /// cannot be represented as a 64 bit integer the result will be
    /// `0x8000_0000_0000_0000` (`std::i64::MIN`) or trigger an invalid operation
    /// floating point exception if unmasked (see
    /// [`_mm_setcsr`](fn._mm_setcsr.html)).
    ///
    /// This corresponds to the `CVTSS2SI` instruction (with 64 bit output).
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cvtss_si64)
    #[inline]
    #[target_feature(enable = "sse")]
    #[cfg_attr(test, assert_instr(cvtss2si))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cvtss_si64(a: __m128) -> i64 {
        cvtss2si64(a)
    }

    /// Converts the lowest 32 bit float in the input vector to a 64 bit integer
    /// with truncation.
    ///
    /// The result is rounded always using truncation (round towards zero). If the
    /// result cannot be represented as a 64 bit integer the result will be
    /// `0x8000_0000_0000_0000` (`std::i64::MIN`) or an invalid operation floating
    /// point exception if unmasked (see [`_mm_setcsr`](fn._mm_setcsr.html)).
    ///
    /// This corresponds to the `CVTTSS2SI` instruction (with 64 bit output).
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cvttss_si64)
    #[inline]
    #[target_feature(enable = "sse")]
    #[cfg_attr(test, assert_instr(cvttss2si))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cvttss_si64(a: __m128) -> i64 {
        cvttss2si64(a)
    }

    /// Converts a 64 bit integer to a 32 bit float. The result vector is the input
    /// vector `a` with the lowest 32 bit float replaced by the converted integer.
    ///
    /// This intrinsic corresponds to the `CVTSI2SS` instruction (with 64 bit
    /// input).
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cvtsi64_ss)
    #[inline]
    #[target_feature(enable = "sse")]
    #[cfg_attr(test, assert_instr(cvtsi2ss))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cvtsi64_ss(a: __m128, b: i64) -> __m128 {
        cvtsi642ss(a, b)
    }

    #[cfg(test)]
    mod tests {
        use crate::core_arch::arch::x86_64::*;
        use std::{f32::NAN, i64::MIN};
        use stdsimd_test::simd_test;

        #[simd_test(enable = "sse")]
        unsafe fn test_mm_cvtss_si64() {
            let inputs = &[
                (42.0f32, 42i64),
                (-31.4, -31),
                (-33.5, -34),
                (-34.5, -34),
                (4.0e10, 40_000_000_000),
                (4.0e-10, 0),
                (NAN, MIN),
                (2147483500.1, 2147483520),
                (9.223371e18, 9223370937343148032),
            ];
            for i in 0..inputs.len() {
                let (xi, e) = inputs[i];
                let x = _mm_setr_ps(xi, 1.0, 3.0, 4.0);
                let r = _mm_cvtss_si64(x);
                assert_eq!(
                    e, r,
                    "TestCase #{} _mm_cvtss_si64({:?}) = {}, expected: {}",
                    i, x, r, e
                );
            }
        }

        #[simd_test(enable = "sse")]
        unsafe fn test_mm_cvttss_si64() {
            let inputs = &[
                (42.0f32, 42i64),
                (-31.4, -31),
                (-33.5, -33),
                (-34.5, -34),
                (10.999, 10),
                (-5.99, -5),
                (4.0e10, 40_000_000_000),
                (4.0e-10, 0),
                (NAN, MIN),
                (2147483500.1, 2147483520),
                (9.223371e18, 9223370937343148032),
                (9.223372e18, MIN),
            ];
            for i in 0..inputs.len() {
                let (xi, e) = inputs[i];
                let x = _mm_setr_ps(xi, 1.0, 3.0, 4.0);
                let r = _mm_cvttss_si64(x);
                assert_eq!(
                    e, r,
                    "TestCase #{} _mm_cvttss_si64({:?}) = {}, expected: {}",
                    i, x, r, e
                );
            }
        }

        #[simd_test(enable = "sse")]
        pub unsafe fn test_mm_cvtsi64_ss() {
            let inputs = &[
                (4555i64, 4555.0f32),
                (322223333, 322223330.0),
                (-432, -432.0),
                (-322223333, -322223330.0),
                (9223372036854775807, 9.223372e18),
                (-9223372036854775808, -9.223372e18),
            ];

            for i in 0..inputs.len() {
                let (x, f) = inputs[i];
                let a = _mm_setr_ps(5.0, 6.0, 7.0, 8.0);
                let r = _mm_cvtsi64_ss(a, x);
                let e = _mm_setr_ps(f, 6.0, 7.0, 8.0);
                assert_eq_m128(e, r);
            }
        }
    }

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