f85047b084
This PR refactors the x64 backend address-mode lowering to use an incremental-build approach, where it considers each node in a tree of `iadd`s that feed into a load/store address and, at each step, builds the best possible `Amode`. It will combine an arbitrary number of constant offsets (an extension beyond the current rules), and can capture a left-shifted (scaled) index in any position of the tree (another extension). This doesn't have any measurable performance improvement on our Wasm benchmarks in Sightglass, unfortunately, because the IR lowered from wasm32 will do address computation in 32 bits and then `uextend` it to add to the 64-bit heap base. We can't quite lift the 32-bit adds to 64 bits because this loses the wraparound semantics. (We could label adds as "expected not to overflow", and allow *those* to be lifted to 64 bit operations; wasm32 heap address computation should fit this. This is `add nuw` (no unsigned wrap) in LLVM IR terms. That's likely my next step.) Nevertheless, (i) this generalizes the cases we can handle, which should be a good thing, all other things being equal (and in this case, no compile time impact was measured); and (ii) might benefit non-Wasm frontends.
wasmtime
A standalone runtime for WebAssembly
A Bytecode Alliance project
Guide | Contributing | Website | Chat
Installation
The Wasmtime CLI can be installed on Linux and macOS with a small install script:
curl https://wasmtime.dev/install.sh -sSf | bash
Windows or otherwise interested users can download installers and binaries directly from the GitHub Releases page.
Example
If you've got the Rust compiler installed then you can take some Rust source code:
fn main() {
println!("Hello, world!");
}
and compile/run it with:
$ rustup target add wasm32-wasi
$ rustc hello.rs --target wasm32-wasi
$ wasmtime hello.wasm
Hello, world!
Features
-
Lightweight. Wasmtime is a standalone runtime for WebAssembly that scales with your needs. It fits on tiny chips as well as makes use of huge servers. Wasmtime can be embedded into almost any application too.
-
Fast. Wasmtime is built on the optimizing Cranelift code generator to quickly generate high-quality machine code at runtime.
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Configurable. Whether you need to precompile your wasm ahead of time, or interpret it at runtime, Wasmtime has you covered for all your wasm-executing needs.
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WASI. Wasmtime supports a rich set of APIs for interacting with the host environment through the WASI standard.
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Standards Compliant. Wasmtime passes the official WebAssembly test suite, implements the official C API of wasm, and implements future proposals to WebAssembly as well. Wasmtime developers are intimately engaged with the WebAssembly standards process all along the way too.
Language Support
You can use Wasmtime from a variety of different languages through embeddings of the implementation:
- Rust - the
wasmtimecrate - C - the
wasm.h,wasi.h, andwasmtime.hheaders or usewasmtimeConan package - C++ - the
wasmtime-cpprepository or usewasmtime-cppConan package - Python - the
wasmtimePyPI package - .NET - the
WasmtimeNuGet package - Go - the
wasmtime-gorepository
Documentation
📚 Read the Wasmtime guide here! 📚
The wasmtime guide is the best starting point to learn about what Wasmtime can do for you or help answer your questions about Wasmtime. If you're curious in contributing to Wasmtime, it can also help you do that!
It's Wasmtime.