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011f313edc
[mips] Add CCValAssign::[ASZ]ExtUpper and CCPromoteToUpperBitsInType and handle struct's correctly on big-endian N32/N64 return values. Summary: The N32/N64 ABI's require that structs passed in registers are laid out such that spilling the register with 'sd' places the struct at the lowest address. For little endian this is trivial but for big-endian it requires that structs are shifted into the upper bits of the register. We also require that structs passed in registers have the 'inreg' attribute for big-endian N32/N64 to work correctly. This is because the tablegen-erated calling convention implementation only has access to the lowered form of struct arguments (one or more integers of up to 64-bits each) and is unable to determine the original type. Reviewers: vmedic Reviewed By: vmedic Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D5286 git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_35@223018 91177308-0d34-0410-b5e6-96231b3b80d8 |
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