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A subclass is allowed to have a larger spill size than the superclass, and the spill alignment must be a multiple of the superclass alignment. This causes the following new subclass relations: === Alpha === F4RC -> F8RC === PPC === F4RC -> F8RC === SPU === R8C -> R16C -> R32C/R32FP -> R64C/R64FP -> GPRC/VECREG === X86 === FR32 -> FR64 -> VR128 RFP32 -> RFP64 -> RFP80 These subclass relations are consistent with the behaviour of -join-cross-class-copies. llvm-svn: 70511
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