Stream: git-wasmtime

Topic: wasmtime / PR #6676 Update calling conventions for wasm f...

Wasmtime GitHub notifications bot (Jun 30 2023 at 18:57):

alexcrichton opened PR #6676 from alexcrichton:wasm-call-conv to bytecodealliance:main:

This resolves two issues from recent changes in #6649:

• First the s390x calling convention for wasm functions is changed back to WasmtimeSystemV from Fast. This was an accidental omission from #6649 where the conclusion was that s390x will continue using a calling convention with little-endian lane order for lane arguments. The only calling convention that supports this today is WasmtimeSystemV, although the Tail calling convention will likely use it in the future as well.

• Second the apple-aarch64 platform now uses the Fast calling convention instead of AppleAarch64 calling convention. That convention was specified in #4195 but local testing shows that is not necessary in the sense that tests all pass with the Fast calling convention. This means that the prior comment why the AppleAarch64 calling convention is required is no longer accurate and in the absence of a reason not to I went ahead and switched it to Fast.

In the near future all wasm functions will unconditionally use the Tail calling convention and at that time the lane order can be specified on s390x to be little-endian to satisfy all the constraints here. Additionally any unwinding directives, if necessary for aarch64, can be specified as needed.

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Wasmtime GitHub notifications bot (Jun 30 2023 at 18:57):

alexcrichton requested itsrainy for a review on PR #6676.

Wasmtime GitHub notifications bot (Jun 30 2023 at 18:57):

alexcrichton requested wasmtime-core-reviewers for a review on PR #6676.

Wasmtime GitHub notifications bot (Jun 30 2023 at 18:58):

alexcrichton updated PR #6676.

Wasmtime GitHub notifications bot (Jul 06 2023 at 17:37):

fitzgen submitted PR review.

Wasmtime GitHub notifications bot (Jul 06 2023 at 18:20):

fitzgen merged PR #6676.

Last updated: Dec 23 2024 at 12:05 UTC