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...e AddInstruction::Wrapping: // ... case AddInstruction::UndefinedSigned: // ... case AddInstruction::UndefinedUnsigned: // ... } } } with this: switch (I->getOpcode()) { case Instruction::Add: // ... case Instruction::SAdd_Open: // ... case Instruction::UAdd_Open: // ... break; } I'm not sure about the name "Open"; fixed-size integers are "closed" under wrapping and saturating add, so "open" sort of suggests an alternative, and is concise. But regardless,...

Edwin was asking about how we should handle PR3328, how we should make GEP respect -fwrapv etc. I wrote up some thoughts here if anyone is interested: http://nondot.org/sabre/LLVMNotes/IntegerOverflow.txt -Chris