wasmtime / PR #13854 cranelift: add arm32 backend · git-wasmtime

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Wasmtime GitHub notifications bot (Jul 24 2026 at 16:33):

alexcrichton commented on PR #13854:

Apologies @obeis I forgot this was assigned to me after this week's Cranelift meeting. For review of this I'm going to mostly defer to @cfallin and @fitzgen who are the primary maintainers of Cranelift's backends and probably have more insight into various pieces here than I do.

One thing I can provide some review on though is the CI infrastructure. Currently this doesn't add anything new which means that the filetests are executed but there aren't, for example, any runtests nor QEMU emulation. This means that we're never actually executing any of the generated code here which is a gap we'll either want to close in this PR or very shortly thereafter. Would you be interested in integrating the QEMU/execution side into this PR as well? For example enabling any runtests that this PR enables for arm32? I believe @cpetig's work could be a good starting point here.

Wasmtime GitHub notifications bot (Jul 24 2026 at 16:34):

alexcrichton requested fitzgen for a review on PR #13854.

Wasmtime GitHub notifications bot (Jul 24 2026 at 16:34):

alexcrichton requested cfallin for a review on PR #13854.

Wasmtime GitHub notifications bot (Jul 24 2026 at 16:34):

alexcrichton unassigned alexcrichton from PR #13854 cranelift: add arm32 backend.

Wasmtime GitHub notifications bot (Jul 26 2026 at 09:06):

obeis commented on PR #13854:

No problem, I will add the QEMU execution.

Wasmtime GitHub notifications bot (Aug 01 2026 at 09:44):

obeis updated PR #13854.

Wasmtime GitHub notifications bot (Aug 01 2026 at 09:48):

obeis updated PR #13854.

Wasmtime GitHub notifications bot (Aug 01 2026 at 10:01):

obeis updated PR #13854.

Wasmtime GitHub notifications bot (Aug 03 2026 at 17:10):

alexcrichton commented on PR #13854:

@cpetig I'm a bit confused by the latest commit, could you expand on it a bit? For example it seems like it duplicates the preexisting logic at crates/wast and cargo test --test wast for this repo. Is the intention to get some pieces running while everything's not stood up yet? If that's the case the crates/test-utils/src/wast.rs file has a bunch of filters/hooks to assert tests are either passing or not.

Wasmtime GitHub notifications bot (Aug 06 2026 at 20:34):

cpetig commented on PR #13854:

Hi @alexcrichton, your doubts are valid. I was suspecting that I can use a lot more existing infrastructure for the qemu tests, but I didn't find it at first try.

So I wanted to make sure that @obeis is able to use it before I disappeared for two weeks. Thus, I created a merge request to his branch which now got merged here, which wasn't my original intention. Probably motivated by a reading of your last message.

I plan to further refine the patch a week from now. Thank you for the hints on where to find the other parts of the logic.

Wasmtime GitHub notifications bot (Aug 06 2026 at 22:51):

cpetig edited a comment on PR #13854:

Hi @alexcrichton, your doubts are valid. I was suspecting that I can use a lot more existing infrastructure for the qemu tests, but I didn't find it at first try.

So I wanted to make sure that @obeis is able to use it before I disappeared busy for two weeks. Thus, I created a merge request to his branch which now got merged here, which wasn't my original intention. Probably motivated by a reading of your last message.

I plan to further refine the patch a week from now. Thank you for the hints on where to find the other parts of the logic.

Last updated: Aug 30 2026 at 09:07 UTC