+ // Try constant folding a bitcast of both instructions to an integer. If we
+ // get two identical ConstantInt's, then we are good to share them. We use
+ // the constant folding APIs to do this so that we get the benefit of
+ // TargetData.
+ if (isa<PointerType>(A->getType()))
+ A = ConstantFoldInstOperands(Instruction::PtrToInt, IntTy,
+ const_cast<Constant*>(A), TD);
+ else if (A->getType() != IntTy)
+ A = ConstantFoldInstOperands(Instruction::BitCast, IntTy,
+ const_cast<Constant*>(A), TD);
+ if (isa<PointerType>(B->getType()))
+ B = ConstantFoldInstOperands(Instruction::PtrToInt, IntTy,
+ const_cast<Constant*>(B), TD);
+ else if (B->getType() != IntTy)
+ B = ConstantFoldInstOperands(Instruction::BitCast, IntTy,
+ const_cast<Constant*>(B), TD);