7d0f6ab90f
This commit is the first "meaty" instruction added to ISLE for the AArch64 backend. I chose to pick the first two in the current lowering's `match` statement, `isub` and `iadd`. These two turned out to be particularly interesting for a few reasons: * Both had clearly migratable-to-ISLE behavior along the lines of special-casing per type. For example 128-bit and vector arithmetic were both easily translateable. * The `iadd` instruction has special cases for fusing with a multiplication to generate `madd` which is expressed pretty easily in ISLE. * Otherwise both instructions had a number of forms where they attempted to interpret the RHS as various forms of constants, extends, or shifts. There's a bit of a design space of how best to represent this in ISLE and what I settled on was to have a special case for each form of instruction, and the special cases are somewhat duplicated between `iadd` and `isub`. There's custom "extractors" for the special cases and instructions that support these special cases will have an `rule`-per-case. Overall I think the ISLE transitioned pretty well. I don't think that the aarch64 backend is going to follow the x64 backend super closely, though. For example the x64 backend is having a helper-per-instruction at the moment but with AArch64 it seems to make more sense to only have a helper-per-enum-variant-of-`MInst`. This is because the same instruction (e.g. `ALUOp::Sub32`) can be expressed with multiple different forms depending on the payload. It's worth noting that the ISLE looks like it's a good deal larger than the code actually being removed from lowering as part of this commit. I think this is deceptive though because a lot of the logic in `put_input_in_rse_imm12_maybe_negated` and `alu_inst_imm12` is being inlined into the ISLE definitions for each instruction instead of having it all packed into the helper functions. Some of the "boilerplate" here is the addition of various ISLE utilities as well.
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.
-
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.
-
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.