[PATCH] D60349: [COFF, ARM64] Fix ABI implementation of struct returns

[Mandeep Singh Grang via Phabricator via cfe-commits]

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In D60349#1462638 <https://reviews.llvm.org/D60349#1462638>, @ostannard wrote:

> The document you linked in the LLVM change (https://docs.microsoft.com/en-us/cpp/build/arm64-windows-abi-conventions?view=vs-2019#return-values) says that small POD types are returned directly in X0 or X0 and X1, but this looks like it will always return them indirectly. I think we also need to check the size of the type, and fall back the the plain C ABI for small types.





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