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    //! `i686`'s Streaming SIMD Extensions 4.1 (SSE4.1)

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

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

    /// Extracts an 64-bit integer from `a` selected with `imm8`
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_extract_epi64)
    #[inline]
    #[target_feature(enable = "sse4.1")]
    #[cfg_attr(all(test, not(target_os = "windows")), assert_instr(pextrq, imm8 = 1))]
    #[rustc_args_required_const(1)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_extract_epi64(a: __m128i, imm8: i32) -> i64 {
        let imm8 = (imm8 & 1) as u32;
        simd_extract(a.as_i64x2(), imm8)
    }

    /// Returns a copy of `a` with the 64-bit integer from `i` inserted at a
    /// location specified by `imm8`.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_insert_epi64)
    #[inline]
    #[target_feature(enable = "sse4.1")]
    #[cfg_attr(test, assert_instr(pinsrq, imm8 = 0))]
    #[rustc_args_required_const(2)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_insert_epi64(a: __m128i, i: i64, imm8: i32) -> __m128i {
        transmute(simd_insert(a.as_i64x2(), (imm8 & 1) as u32, i))
    }

    #[cfg(test)]
    mod tests {
        use crate::core_arch::arch::x86_64::*;
        use stdsimd_test::simd_test;

        #[simd_test(enable = "sse4.1")]
        unsafe fn test_mm_extract_epi64() {
            let a = _mm_setr_epi64x(0, 1);
            let r = _mm_extract_epi64(a, 1);
            assert_eq!(r, 1);
            let r = _mm_extract_epi64(a, 3);
            assert_eq!(r, 1);
        }

        #[simd_test(enable = "sse4.1")]
        unsafe fn test_mm_insert_epi64() {
            let a = _mm_set1_epi64x(0);
            let e = _mm_setr_epi64x(0, 32);
            let r = _mm_insert_epi64(a, 32, 1);
            assert_eq_m128i(r, e);
            let r = _mm_insert_epi64(a, 32, 3);
            assert_eq_m128i(r, e);
        }
    }

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