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features.json: watr supports acquire-release atomics as of 5.9.0 - #561

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tomayac merged 1 commit into
WebAssembly:mainfrom
dy:watr-acquire-release
Aug 19, 2026
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features.json: watr supports acquire-release atomics as of 5.9.0#561
tomayac merged 1 commit into
WebAssembly:mainfrom
dy:watr-acquire-release

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@dy

@dy dy commented Aug 19, 2026

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Adds "acquireReleaseAtomics": "5.9.0" to the watr entry.

watr 5.9.0 (npm) compiles the ordering immediate on atomic loads, matching the proposal's reference interpreter scope: trailing seqcst/acqrel keyword in the text format, flags bit 4 plus ordering byte in the binary format. Byte output is verified against the official generated test (test/core/acquire-release-atomics/basic.wast), including the malformed case for non-atomic loads. Stores, RMW, fence and pause follow once the reference interpreter defines their text syntax.

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LGTM, thanks!

@tomayac
tomayac merged commit ca557f0 into WebAssembly:main Aug 19, 2026
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2 participants