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    //! `i686`'s Streaming SIMD Extensions 4a (`SSE4a`)

    use coresimd::simd::*;
    use coresimd::x86::*;
    use mem;

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

    #[allow(improper_ctypes)]
    extern "C" {
        #[link_name = "llvm.x86.sse4a.extrq"]
        fn extrq(x: i64x2, y: i8x16) -> i64x2;
        #[link_name = "llvm.x86.sse4a.insertq"]
        fn insertq(x: i64x2, y: i64x2) -> i64x2;
        #[link_name = "llvm.x86.sse4a.movnt.sd"]
        fn movntsd(x: *mut f64, y: __m128d);
        #[link_name = "llvm.x86.sse4a.movnt.ss"]
        fn movntss(x: *mut f32, y: __m128);
    }

    // FIXME(blocked on #248): _mm_extracti_si64(x, len, idx) // EXTRQ
    // FIXME(blocked on #248): _mm_inserti_si64(x, y, len, idx) // INSERTQ

    /// Extracts the bit range specified by `y` from the lower 64 bits of `x`.
    ///
    /// The `[13:8]` bits of `y` specify the index of the bit-range to extract. The
    /// `[5:0]` bits of `y` specify the length of the bit-range to extract. All other
    /// bits are ignored.
    ///
    /// If the length is zero, it is interpreted as `64`. If the length and index
    /// are zero, the lower 64 bits of `x` are extracted.
    ///
    /// If `length == 0 && index > 0` or `lenght + index > 64` the result is
    /// undefined.
    #[inline]
    #[target_feature(enable = "sse4a")]
    #[cfg_attr(test, assert_instr(extrq))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_extract_si64(x: __m128i, y: __m128i) -> __m128i {
        mem::transmute(extrq(x.as_i64x2(), y.as_i8x16()))
    }

    /// Inserts the `[length:0]` bits of `y` into `x` at `index`.
    ///
    /// The bits of `y`:
    ///
    /// - `[69:64]` specify the `length`,
    /// - `[77:72]` specify the index.
    ///
    /// If the `length` is zero it is interpreted as `64`. If `index + length > 64`
    /// or `index > 0 && length == 0` the result is undefined.
    #[inline]
    #[target_feature(enable = "sse4a")]
    #[cfg_attr(test, assert_instr(insertq))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_insert_si64(x: __m128i, y: __m128i) -> __m128i {
        mem::transmute(insertq(x.as_i64x2(), y.as_i64x2()))
    }

    /// Non-temporal store of `a.0` into `p`.
    #[inline]
    #[target_feature(enable = "sse4a")]
    #[cfg_attr(test, assert_instr(movntsd))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_stream_sd(p: *mut f64, a: __m128d) {
        movntsd(p, a);
    }

    /// Non-temporal store of `a.0` into `p`.
    #[inline]
    #[target_feature(enable = "sse4a")]
    #[cfg_attr(test, assert_instr(movntss))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_stream_ss(p: *mut f32, a: __m128) {
        movntss(p, a);
    }

    #[cfg(test)]
    mod tests {
        use coresimd::x86::*;
        use stdsimd_test::simd_test;

        #[simd_test = "sse4a"]
        unsafe fn test_mm_extract_si64() {
            let b = 0b0110_0000_0000_i64;
            //        ^^^^ bit range extracted
            let x = _mm_setr_epi64x(b, 0);
            let v = 0b001000___00___000100_i64;
            //        ^idx: 2^3 = 8 ^length = 2^2 = 4
            let y = _mm_setr_epi64x(v, 0);
            let e = _mm_setr_epi64x(0b0110_i64, 0);
            let r = _mm_extract_si64(x, y);
            assert_eq_m128i(r, e);
        }

        #[simd_test = "sse4a"]
        unsafe fn test_mm_insert_si64() {
            let i = 0b0110_i64;
            //        ^^^^ bit range inserted
            let z = 0b1010_1010_1010i64;
            //        ^^^^ bit range replaced
            let e = 0b0110_1010_1010i64;
            //        ^^^^ replaced 1010 with 0110
            let x = _mm_setr_epi64x(z, 0);
            let expected = _mm_setr_epi64x(e, 0);
            let v = 0b001000___00___000100_i64;
            //        ^idx: 2^3 = 8 ^length = 2^2 = 4
            let y = _mm_setr_epi64x(i, v);
            let r = _mm_insert_si64(x, y);
            assert_eq_m128i(r, expected);
        }

        #[repr(align(16))]
        struct MemoryF64 {
            data: [f64; 2],
        }

        #[simd_test = "sse4a"]
        unsafe fn test_mm_stream_sd() {
            let mut mem = MemoryF64 {
                data: [1.0_f64, 2.0],
            };
            {
                let vals = &mut mem.data;
                let d = vals.as_mut_ptr();

                let x = _mm_setr_pd(3.0, 4.0);

                _mm_stream_sd(d, x);
            }
            assert_eq!(mem.data[0], 3.0);
            assert_eq!(mem.data[1], 2.0);
        }

        #[repr(align(16))]
        struct MemoryF32 {
            data: [f32; 4],
        }

        #[simd_test = "sse4a"]
        unsafe fn test_mm_stream_ss() {
            let mut mem = MemoryF32 {
                data: [1.0_f32, 2.0, 3.0, 4.0],
            };
            {
                let vals = &mut mem.data;
                let d = vals.as_mut_ptr();

                let x = _mm_setr_ps(5.0, 6.0, 7.0, 8.0);

                _mm_stream_ss(d, x);
            }
            assert_eq!(mem.data[0], 5.0);
            assert_eq!(mem.data[1], 2.0);
            assert_eq!(mem.data[2], 3.0);
            assert_eq!(mem.data[3], 4.0);
        }
    }

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