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+//! `core_arch`
+
+#[macro_use]
+mod macros;
+
+#[cfg(any(target_arch = "arm", target_arch = "aarch64", doc))]
+mod arm_shared;
+
+mod simd;
+
+#[doc = include_str!("core_arch_docs.md")]
+#[stable(feature = "simd_arch", since = "1.27.0")]
+pub mod arch {
+    /// Platform-specific intrinsics for the `x86` platform.
+    ///
+    /// See the [module documentation](../index.html) for more details.
+    #[cfg(any(target_arch = "x86", doc))]
+    #[doc(cfg(target_arch = "x86"))]
+    #[stable(feature = "simd_x86", since = "1.27.0")]
+    pub mod x86 {
+        #[stable(feature = "simd_x86", since = "1.27.0")]
+        pub use crate::core_arch::x86::*;
+    }
+
+    /// Platform-specific intrinsics for the `x86_64` platform.
+    ///
+    /// See the [module documentation](../index.html) for more details.
+    #[cfg(any(target_arch = "x86_64", doc))]
+    #[doc(cfg(target_arch = "x86_64"))]
+    #[stable(feature = "simd_x86", since = "1.27.0")]
+    pub mod x86_64 {
+        #[stable(feature = "simd_x86", since = "1.27.0")]
+        pub use crate::core_arch::x86::*;
+        #[stable(feature = "simd_x86", since = "1.27.0")]
+        pub use crate::core_arch::x86_64::*;
+    }
+
+    /// Platform-specific intrinsics for the `arm` platform.
+    ///
+    /// See the [module documentation](../index.html) for more details.
+    #[cfg(any(target_arch = "arm", doc))]
+    #[doc(cfg(target_arch = "arm"))]
+    #[unstable(feature = "stdsimd", issue = "27731")]
+    pub mod arm {
+        pub use crate::core_arch::arm::*;
+    }
+
+    /// Platform-specific intrinsics for the `aarch64` platform.
+    ///
+    /// See the [module documentation](../index.html) for more details.
+    #[cfg(any(target_arch = "aarch64", doc))]
+    #[doc(cfg(target_arch = "aarch64"))]
+    #[stable(feature = "neon_intrinsics", since = "1.59.0")]
+    pub mod aarch64 {
+        #[stable(feature = "neon_intrinsics", since = "1.59.0")]
+        pub use crate::core_arch::aarch64::*;
+    }
+
+    /// Platform-specific intrinsics for the `riscv32` platform.
+    ///
+    /// See the [module documentation](../index.html) for more details.
+    #[cfg(any(target_arch = "riscv32", doc))]
+    #[doc(cfg(any(target_arch = "riscv32")))]
+    #[unstable(feature = "stdsimd", issue = "27731")]
+    pub mod riscv32 {
+        pub use crate::core_arch::riscv_shared::*;
+    }
+
+    /// Platform-specific intrinsics for the `riscv64` platform.
+    ///
+    /// See the [module documentation](../index.html) for more details.
+    #[cfg(any(target_arch = "riscv64", doc))]
+    #[doc(cfg(any(target_arch = "riscv64")))]
+    #[unstable(feature = "stdsimd", issue = "27731")]
+    pub mod riscv64 {
+        pub use crate::core_arch::riscv64::*;
+        // RISC-V RV64 supports all RV32 instructions as well in current specifications (2022-01-05).
+        // Module `riscv_shared` includes instructions available under all RISC-V platforms,
+        // i.e. RISC-V RV32 instructions.
+        pub use crate::core_arch::riscv_shared::*;
+    }
+
+    /// Platform-specific intrinsics for the `wasm32` platform.
+    ///
+    /// This module provides intrinsics specific to the WebAssembly
+    /// architecture. Here you'll find intrinsics specific to WebAssembly that
+    /// aren't otherwise surfaced somewhere in a cross-platform abstraction of
+    /// `std`, and you'll also find functions for leveraging WebAssembly
+    /// proposals such as [atomics] and [simd].
+    ///
+    /// Intrinsics in the `wasm32` module are modeled after the WebAssembly
+    /// instructions that they represent. Most functions are named after the
+    /// instruction they intend to correspond to, and the arguments/results
+    /// correspond to the type signature of the instruction itself. Stable
+    /// WebAssembly instructions are [documented online][instrdoc].
+    ///
+    /// [instrdoc]: https://webassembly.github.io/spec/core/valid/instructions.html
+    ///
+    /// If a proposal is not yet stable in WebAssembly itself then the functions
+    /// within this function may be unstable and require the nightly channel of
+    /// Rust to use. As the proposal itself stabilizes the intrinsics in this
+    /// module should stabilize as well.
+    ///
+    /// [atomics]: https://github.com/webassembly/threads
+    /// [simd]: https://github.com/webassembly/simd
+    ///
+    /// See the [module documentation](../index.html) for general information
+    /// about the `arch` module and platform intrinsics.
+    ///
+    /// ## Atomics
+    ///
+    /// The [threads proposal][atomics] for WebAssembly adds a number of
+    /// instructions for dealing with multithreaded programs. Most instructions
+    /// added in the [atomics] proposal are exposed in Rust through the
+    /// `std::sync::atomic` module. Some instructions, however, don't have
+    /// direct equivalents in Rust so they're exposed here instead.
+    ///
+    /// Note that the instructions added in the [atomics] proposal can work in
+    /// either a context with a shared wasm memory and without. These intrinsics
+    /// are always available in the standard library, but you likely won't be
+    /// able to use them too productively unless you recompile the standard
+    /// library (and all your code) with `-Ctarget-feature=+atomics`.
+    ///
+    /// It's also worth pointing out that multi-threaded WebAssembly and its
+    /// story in Rust is still in a somewhat "early days" phase as of the time
+    /// of this writing. Pieces should mostly work but it generally requires a
+    /// good deal of manual setup. At this time it's not as simple as "just call
+    /// `std::thread::spawn`", but it will hopefully get there one day!
+    ///
+    /// ## SIMD
+    ///
+    /// The [simd proposal][simd] for WebAssembly added a new `v128` type for a
+    /// 128-bit SIMD register. It also added a large array of instructions to
+    /// operate on the `v128` type to perform data processing. Using SIMD on
+    /// wasm is intended to be similar to as you would on `x86_64`, for example.
+    /// You'd write a function such as:
+    ///
+    /// ```rust,ignore
+    /// #[cfg(target_arch = "wasm32")]
+    /// #[target_feature(enable = "simd128")]
+    /// unsafe fn uses_simd() {
+    ///     use std::arch::wasm32::*;
+    ///     // ...
+    /// }
+    /// ```
+    ///
+    /// Unlike `x86_64`, however, WebAssembly does not currently have dynamic
+    /// detection at runtime as to whether SIMD is supported (this is one of the
+    /// motivators for the [conditional sections][condsections] and [feature
+    /// detection] proposals, but that is still pretty early days). This means
+    /// that your binary will either have SIMD and can only run on engines
+    /// which support SIMD, or it will not have SIMD at all. For compatibility
+    /// the standard library itself does not use any SIMD internally.
+    /// Determining how best to ship your WebAssembly binary with SIMD is
+    /// largely left up to you as it can can be pretty nuanced depending on
+    /// your situation.
+    ///
+    /// [condsections]: https://github.com/webassembly/conditional-sections
+    /// [feature detection]: https://github.com/WebAssembly/feature-detection
+    ///
+    /// To enable SIMD support at compile time you need to do one of two things:
+    ///
+    /// * First you can annotate functions with `#[target_feature(enable =
+    ///   "simd128")]`. This causes just that one function to have SIMD support
+    ///   available to it, and intrinsics will get inlined as usual in this
+    ///   situation.
+    ///
+    /// * Second you can compile your program with `-Ctarget-feature=+simd128`.
+    ///   This compilation flag blanket enables SIMD support for your entire
+    ///   compilation. Note that this does not include the standard library
+    ///   unless you [recompile the standard library][buildstd].
+    ///
+    /// [buildstd]: https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#build-std
+    ///
+    /// If you enable SIMD via either of these routes then you'll have a
+    /// WebAssembly binary that uses SIMD instructions, and you'll need to ship
+    /// that accordingly. Also note that if you call SIMD intrinsics but don't
+    /// enable SIMD via either of these mechanisms, you'll still have SIMD
+    /// generated in your program. This means to generate a binary without SIMD
+    /// you'll need to avoid both options above plus calling into any intrinsics
+    /// in this module.
+    #[cfg(any(target_arch = "wasm32", doc))]
+    #[doc(cfg(target_arch = "wasm32"))]
+    #[stable(feature = "simd_wasm32", since = "1.33.0")]
+    pub mod wasm32 {
+        #[stable(feature = "simd_wasm32", since = "1.33.0")]
+        pub use crate::core_arch::wasm32::*;
+    }
+
+    /// Platform-specific intrinsics for the `wasm64` platform.
+    ///
+    /// See the [module documentation](../index.html) for more details.
+    #[cfg(any(target_arch = "wasm64", doc))]
+    #[doc(cfg(target_arch = "wasm64"))]
+    #[unstable(feature = "simd_wasm64", issue = "90599")]
+    pub mod wasm64 {
+        #[unstable(feature = "simd_wasm64", issue = "90599")]
+        pub use crate::core_arch::wasm32::*;
+    }
+
+    /// Platform-specific intrinsics for the `wasm` target family.
+    ///
+    /// See the [module documentation](../index.html) for more details.
+    #[cfg(any(target_family = "wasm", doc))]
+    #[doc(cfg(target_family = "wasm"))]
+    #[unstable(feature = "simd_wasm64", issue = "90599")]
+    pub mod wasm {
+        #[unstable(feature = "simd_wasm64", issue = "90599")]
+        pub use crate::core_arch::wasm32::*;
+    }
+
+    /// Platform-specific intrinsics for the `mips` platform.
+    ///
+    /// See the [module documentation](../index.html) for more details.
+    #[cfg(any(target_arch = "mips", doc))]
+    #[doc(cfg(target_arch = "mips"))]
+    #[unstable(feature = "stdsimd", issue = "27731")]
+    pub mod mips {
+        pub use crate::core_arch::mips::*;
+    }
+
+    /// Platform-specific intrinsics for the `mips64` platform.
+    ///
+    /// See the [module documentation](../index.html) for more details.
+    #[cfg(any(target_arch = "mips64", doc))]
+    #[doc(cfg(target_arch = "mips64"))]
+    #[unstable(feature = "stdsimd", issue = "27731")]
+    pub mod mips64 {
+        pub use crate::core_arch::mips::*;
+    }
+
+    /// Platform-specific intrinsics for the `PowerPC` platform.
+    ///
+    /// See the [module documentation](../index.html) for more details.
+    #[cfg(any(target_arch = "powerpc", doc))]
+    #[doc(cfg(target_arch = "powerpc"))]
+    #[unstable(feature = "stdsimd", issue = "27731")]
+    pub mod powerpc {
+        pub use crate::core_arch::powerpc::*;
+    }
+
+    /// Platform-specific intrinsics for the `PowerPC64` platform.
+    ///
+    /// See the [module documentation](../index.html) for more details.
+    #[cfg(any(target_arch = "powerpc64", doc))]
+    #[doc(cfg(target_arch = "powerpc64"))]
+    #[unstable(feature = "stdsimd", issue = "27731")]
+    pub mod powerpc64 {
+        pub use crate::core_arch::powerpc64::*;
+    }
+
+    /// Platform-specific intrinsics for the `NVPTX` platform.
+    ///
+    /// See the [module documentation](../index.html) for more details.
+    #[cfg(any(target_arch = "nvptx", target_arch = "nvptx64", doc))]
+    #[doc(cfg(any(target_arch = "nvptx", target_arch = "nvptx64")))]
+    #[unstable(feature = "stdsimd", issue = "27731")]
+    pub mod nvptx {
+        pub use crate::core_arch::nvptx::*;
+    }
+}
+
+mod simd_llvm;
+
+#[cfg(any(target_arch = "x86", target_arch = "x86_64", doc))]
+#[doc(cfg(any(target_arch = "x86", target_arch = "x86_64")))]
+mod x86;
+#[cfg(any(target_arch = "x86_64", doc))]
+#[doc(cfg(target_arch = "x86_64"))]
+mod x86_64;
+
+#[cfg(any(target_arch = "aarch64", doc))]
+#[doc(cfg(target_arch = "aarch64"))]
+mod aarch64;
+#[cfg(any(target_arch = "arm", doc))]
+#[doc(cfg(any(target_arch = "arm")))]
+mod arm;
+
+#[cfg(any(target_arch = "riscv32", target_arch = "riscv64", doc))]
+#[doc(cfg(any(target_arch = "riscv32", target_arch = "riscv64")))]
+mod riscv_shared;
+
+#[cfg(any(target_arch = "riscv64", doc))]
+#[doc(cfg(any(target_arch = "riscv64")))]
+mod riscv64;
+
+#[cfg(any(target_family = "wasm", doc))]
+#[doc(cfg(target_family = "wasm"))]
+mod wasm32;
+
+#[cfg(any(target_arch = "mips", target_arch = "mips64", doc))]
+#[doc(cfg(any(target_arch = "mips", target_arch = "mips64")))]
+mod mips;
+
+#[cfg(any(target_arch = "powerpc", target_arch = "powerpc64", doc))]
+#[doc(cfg(any(target_arch = "powerpc", target_arch = "powerpc64")))]
+mod powerpc;
+
+#[cfg(any(target_arch = "powerpc64", doc))]
+#[doc(cfg(target_arch = "powerpc64"))]
+mod powerpc64;
+
+#[cfg(any(target_arch = "nvptx", target_arch = "nvptx64", doc))]
+#[doc(cfg(any(target_arch = "nvptx", target_arch = "nvptx64")))]
+mod nvptx;