Fix PassMode::Cast ABI argument lowering#1659
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Kuhai9801 wants to merge 2 commits into
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bjorn3
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May 31, 2026
| assert_eq!(params[1].0, Size::from_bytes(8)); | ||
| assert_eq!(params[1].1.value_type, types::I64); | ||
| } | ||
| } |
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We don't run unit tests.
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It would be nice if we had a concrete test for a case that goes wrong without this change. |
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Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @Mark-Simulacrum (NB. this repo may be misconfigured) some time within the next two weeks. |
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Fixes #1477.
Updates
PassMode::Castlowering to pass rounded full ABI units for integer rest fields, matchingCastTarget's rounded ABI layout. Casted call arguments now spill Rust-layout storage into an ABI-sized scratch slot before loading ABI parameters, so ABI padding does not cause loads from the wrong representation.The patch also updates ABI parameter rounding for cast targets. A unit test covers the rounded integer rest case.
Verification:
git diff --checkcargo fmt --check