Add Homogenous Aggregates for AArch64 codegen #24181
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r? @pnkfelix (rust_highfive has picked a reviewer for you, use r? to override) |
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I propose we merge this as-is. 1. This is a localized change. 2. This apparently works. 3. We have no infrastructure to test ARM64 changes, yet. |
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(I just squashed a commit to fix some typos in the comments - no code changes.) |
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I agree with @sanxiyn 's analysis; sorry for the delay in review. |
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I doubt this PR is ready to merge as-is, for a couple reasons: * There are no tests for this change. I'm not sure how to add tests for this change, as it modifies the C ABI for a cross-compilation target. Anecdotally, I have an iOS library I've been working on, and before this change, it crashes running on an arm64 device due to bad calling conventions (a simplified example is in #24154), and after this change, it runs correctly. * This is my first foray into LLVM. I did my best to reimplement what Clang does for AArch64 codegen (https://github.com/llvm-mirror/clang/blob/master/lib/CodeGen/TargetInfo.cpp), particularly in `ABIInfo::isHomogeneousAggregate`, `AArch64ABIInfo::isHomogeneousAggregateBaseType`, and `AArch64ABIInfo::isHomogeneousAggregateSmallEnough`, but I'm not confident I got a complete translation, particularly because Clang includes a lot of checks that I don't believe are necessary for rustc. Fixes #24154.
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I doubt this PR is ready to merge as-is, for a couple reasons:
ABIInfo::isHomogeneousAggregate,AArch64ABIInfo::isHomogeneousAggregateBaseType, andAArch64ABIInfo::isHomogeneousAggregateSmallEnough, but I'm not confident I got a complete translation, particularly because Clang includes a lot of checks that I don't believe are necessary for rustc.Fixes #24154.