Wasmtime GitHub notifications bot (Jun 12 2025 at 14:49): Wasmtime GitHub notifications bot (Jun 12 2025 at 14:49):alexcrichton opened PR #11026 from alexcrichton:x64-fix-scalar-to-vector to bytecodealliance:main:
The current logic traces back to #2489 but I think has been buggy ever since. The semantics of the CLIF
scalar_to_vectorinstruction is that the upper bits are zeroed in the resulting vector but Cranelift otherwise leaves the upper bits of registers undefined. This means that a float scalar to vector must actively zero the upper bits rather than leave the preserved.Closes #11024
<!--
Please make sure you include the following information:
If this work has been discussed elsewhere, please include a link to that
conversation. If it was discussed in an issue, just mention "issue #...".Explain why this change is needed. If the details are in an issue already,
this can be brief.Our development process is documented in the Wasmtime book:
https://docs.wasmtime.dev/contributing-development-process.htmlPlease ensure all communication follows the code of conduct:
https://github.com/bytecodealliance/wasmtime/blob/main/CODE_OF_CONDUCT.md
-->
Wasmtime GitHub notifications bot (Jun 12 2025 at 14:49):alexcrichton requested cfallin for a review on PR #11026.
Wasmtime GitHub notifications bot (Jun 12 2025 at 14:49):alexcrichton requested wasmtime-compiler-reviewers for a review on PR #11026.
Wasmtime GitHub notifications bot (Jun 12 2025 at 16:28):abrown submitted PR review.
Wasmtime GitHub notifications bot (Jun 12 2025 at 17:58):alexcrichton updated PR #11026.
Wasmtime GitHub notifications bot (Jun 12 2025 at 17:58):alexcrichton has enabled auto merge for PR #11026.
Wasmtime GitHub notifications bot (Jun 12 2025 at 18:43):alexcrichton updated PR #11026.
Wasmtime GitHub notifications bot (Jun 12 2025 at 20:34):alexcrichton merged PR #11026.
Last updated: Dec 06 2025 at 06:05 UTC