add wasm64 support

Author: devsnek

crates/core_arch/src/core_arch_docs.md

@@ -191,6 +191,7 @@ others at:
 * [`powerpc64`]
 * [`nvptx`]
 * [`wasm32`]
+* [`wasm64`]
 
 [`x86`]: x86/index.html
 [`x86_64`]: x86_64/index.html
@@ -201,7 +202,8 @@ others at:
 [`powerpc`]: powerpc/index.html
 [`powerpc64`]: powerpc64/index.html
 [`nvptx`]: nvptx/index.html
-[`wasm32`]: wasm32/index.html
+[`wasm32`]: wasm/index.html
+[`wasm64`]: wasm/index.html
 
 # Examples
 

crates/core_arch/src/lib.rs

@@ -41,7 +41,7 @@
     bench_black_box
 )]
 #![cfg_attr(test, feature(test, abi_vectorcall))]
-#![cfg_attr(all(test, target_arch = "wasm32"), feature(wasm_simd))]
+#![cfg_attr(all(test, target_arch = "wasm32", target_arch = "wasm64"), feature(wasm_simd))]
 #![deny(clippy::missing_inline_in_public_items)]
 #![allow(
     clippy::inline_always,

crates/core_arch/src/mod.rs

@@ -58,117 +58,24 @@ pub mod arch {
 
     /// 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. All 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 adds a new `v128` type for a
-    /// 128-bit SIMD register. It also adds a large array of instructions to
-    /// operate on the `v128` type to perform data processing. The SIMD proposal
-    /// at the time of this writing is in [phase 4] which means that it's in the
-    /// standardization phase. It's expected that once some testing on nightly
-    /// has happened a stabilization proposal will be made for the Rust
-    /// intrinsics. If you notice anything awry please feel free to [open an
-    /// issue](https://github.com/rust-lang/stdarch/issues/new).
-    ///
-    /// [phase 4]: https://github.com/webassembly/proposals
-    ///
-    /// Using SIMD 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.
+    /// See the [module documentation](../index.html) for more details.
     #[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::*;
+        pub use crate::core_arch::wasm::*;
+    }
+
+    /// 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"))]
+    #[stable(feature = "", since = "0.0.0")]
+    pub mod wasm64 {
+        #[stable(feature = "", since = "0.0.0")]
+        pub use crate::core_arch::wasm::*;
     }
 
     /// Platform-specific intrinsics for the `mips` platform.
@@ -238,9 +145,9 @@ mod aarch64;
 #[doc(cfg(any(target_arch = "arm")))]
 mod arm;
 
-#[cfg(any(target_arch = "wasm32", doc))]
-#[doc(cfg(target_arch = "wasm32"))]
-mod wasm32;
+#[cfg(any(target_arch = "wasm32", target_arch = "wasm64", doc))]
+#[doc(cfg(any(target_arch = "wasm32", target_arch = "wasm64")))]
+mod wasm;
 
 #[cfg(any(target_arch = "mips", target_arch = "mips64", doc))]
 #[doc(cfg(any(target_arch = "mips", target_arch = "mips64")))]

crates/core_arch/src/wasm32/atomic.rs renamed to crates/core_arch/src/wasm/atomic.rs

@@ -2,10 +2,10 @@
 use stdarch_test::assert_instr;
 
 extern "C" {
-    #[link_name = "llvm.wasm.memory.grow.i32"]
-    fn llvm_memory_grow(mem: u32, pages: i32) -> i32;
-    #[link_name = "llvm.wasm.memory.size.i32"]
-    fn llvm_memory_size(mem: u32) -> i32;
+    #[link_name = "llvm.wasm.memory.grow"]
+    fn llvm_memory_grow(mem: u32, pages: isize) -> isize;
+    #[link_name = "llvm.wasm.memory.size"]
+    fn llvm_memory_size(mem: u32) -> isize;
 }
 
 /// Corresponding intrinsic to wasm's [`memory.size` instruction][instr]
@@ -51,6 +51,6 @@ pub fn memory_size<const MEM: u32>() -> usize {
 pub fn memory_grow<const MEM: u32>(delta: usize) -> usize {
     unsafe {
         static_assert!(MEM: u32 where MEM == 0);
-        llvm_memory_grow(MEM, delta as i32) as isize as usize
+        llvm_memory_grow(MEM, delta as isize) as usize
     }
 }

crates/core_arch/src/wasm32/memory.rs renamed to crates/core_arch/src/wasm/memory.rs

@@ -1,4 +1,4 @@
-//! WASM32 intrinsics
+//! WebAssembly intrinsics
 
 #[cfg(test)]
 use stdarch_test::assert_instr;