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Unsigned addition and subtraction can reuse the instructions created to legalize large width operations (i.e. both produce and consume a carry flag). Signed operations and multiplies get a dedicated op-with-overflow instruction. Once this is produced the two values are combined into a struct register (which will almost always be merged with a corresponding G_EXTRACT as part of legalization). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279278 91177308-0d34-0410-b5e6-96231b3b80d8