asavonic added a comment. In D100225#2681809 <https://reviews.llvm.org/D100225#2681809>, @rjmccall wrote:
> Why does the ABI "require" this to be returned as an i64 if some of the bits > are undefined? AArch64 ABI requires return values (of composite types) to be rounded up to 64 bits (see `AArch64ABIInfo::classifyReturnType`). I assume that if a value, say i16, is rounded up to i64, then the upper 48 bits can be arbitrary (undefined). I think this is aligned with the description of `CreateCoercedLoad`: /// CreateCoercedLoad - Create a load from \arg SrcPtr interpreted as /// a pointer to an object of type \arg Ty, known to be aligned to /// \arg SrcAlign bytes. /// /// This safely handles the case when the src type is smaller than the /// destination type; in this situation the values of bits which not /// present in the src are undefined. Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D100225/new/ https://reviews.llvm.org/D100225 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
