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There's an entire tutorial at http://llvm.org/docs/tutorial which includes covers the IRBuilder to generate all sorts of IR, including the add instruction. You can skip ahead to chapter 3 if you just want to see LLVM API, but I suggest you read the whole tutorial if you have the time. Nick help__me_please wrote: > > Thanks for reply. > I have used AllocaInst, it's working but

Thanks for reply. I have used AllocaInst, it's working but i think it's only for allocating some memory for new variable. And CallInst creates a call instruction. I am looking for creating a add or sub instruction. I used function instruction(), which gives me error "error: cannot allocate an object of abstract type ‘llvm::Instruction’" and also "Instruction.h:28: note: