WebAssembly
Is there any plan to support --target=wasm64-wasi ?
Yes, everything in LLVM's wasm support and wasi-libc was written with wasm64 in mind, so it's just a matter of hooking up the pieces and making sure things actually work.
Nooby question: building a code which uses f64s to wasm32-wasi - Would that lead to errors/unexpected behaviour or is that fine?
wasm64-wasi in wasi-sdk could use some help: if anyone is interested in working on this feel free to pick this up.
The guidance from the WASI Subgroup is that wasm64-wasi should now target WASI 0.2, so the path forward here now looks like:
- Support for 64-bit pointers and lengths in the Canonical ABI. I'm optimistic this will happen fairly soon.
- Implement the 64-bit Canonical ABI in wit-bindgen.
- Support for WASI 0.2 in wasi-libc, which is underway (https://github.com/WebAssembly/wasi-libc/pull/471 and others).
- Once the above are done, add a wasm64-wasi target to wasi-libc.
Support for 64-bit pointers and lengths in the Canonical ABI.
Could u share more about that? It seems there are no new comments in https://github.com/WebAssembly/component-model/issues/22 for monthes.
The CanonicalABI change will be conceptually straightforward; things like the size function need to be aware that a list has a pointer and a length, and so on.
https://github.com/bytecodealliance/wit-bindgen/pull/870 gets wit-bindgen a step closer to memory64 support. Beyond this, its size/etc. functions also need to know that a list has a pointer and a length.