Fix PassMode::Cast ABI argument lowering - #1659
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bjorn3
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May 31, 2026
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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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This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed. Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers. |
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@bjorn3 rebased, enabled the ABI-cafe regression, and CI is green. Could you re-review when convenient? |
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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 arguments now use a zero-initialized ABI-sized scratch slot before loading ABI parameters, preventing padding from being read from the Rust-layout representation.The previously waived
SingleVariantUnion::conv_c::repr_cABI-cafe case is now enabled on macOS AArch64.Verification:
cargo fmt --checkcargo check --locked