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diff --git a/library/stdarch/crates/core_arch/src/x86_64/avx.rs b/library/stdarch/crates/core_arch/src/x86_64/avx.rs
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index 000000000..7ba26371c
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+++ b/library/stdarch/crates/core_arch/src/x86_64/avx.rs
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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_legacy_const_generics(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<const INDEX: i32>(a: __m256i, i: i64) -> __m256i {
+    static_assert_imm2!(INDEX);
+    transmute(simd_insert(a.as_i64x4(), INDEX as u32, 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::<3>(a, 0);
+        let e = _mm256_setr_epi64x(1, 2, 3, 0);
+        assert_eq_m256i(r, e);
+    }
+}