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    //! Advanced Vector Extensions (AVX)
    //!
    //! The references are:
    //!
    //! - [Intel 64 and IA-32 Architectures Software Developer's Manual Volume 2:
    //! Instruction Set Reference, A-Z][intel64_ref]. - [AMD64 Architecture
    //! Programmer's Manual, Volume 3: General-Purpose and System
    //! Instructions][amd64_ref].
    //!
    //! [Wikipedia][wiki] provides a quick overview of the instructions available.
    //!
    //! [intel64_ref]: http://www.intel.de/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-instruction-set-reference-manual-325383.pdf
    //! [amd64_ref]: http://support.amd.com/TechDocs/24594.pdf
    //! [wiki]: https://en.wikipedia.org/wiki/Advanced_Vector_Extensions

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

    /// Copies `a` to result, and insert the 64-bit integer `i` into result
    /// at the location specified by `index`.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm256_insert_epi64)
    #[inline]
    #[rustc_args_required_const(2)]
    #[target_feature(enable = "avx")]
    // This intrinsic has no corresponding instruction.
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm256_insert_epi64(a: __m256i, i: i64, index: i32) -> __m256i {
        transmute(simd_insert(a.as_i64x4(), (index as u32) & 3, i))
    }

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

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

        #[simd_test(enable = "avx")]
        unsafe fn test_mm256_insert_epi64() {
            let a = _mm256_setr_epi64x(1, 2, 3, 4);
            let r = _mm256_insert_epi64(a, 0, 3);
            let e = _mm256_setr_epi64x(1, 2, 3, 0);
            assert_eq_m256i(r, e);
        }
    }