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Hey Oscar, I want to extract information from the instruction. Think writing a simple interpreter. I already have the CallInst instance (described above in the message). Via ci->getOperand(1) say I can get the 'i32 8' parameter and I can get the 'i32' and '8' separately as Nick described. But I need to extract the %0 from the CallInst instance somehow. I am not sure

ivtm <martinaide1 at yahoo.com> writes: > Another question, I need to get the "%0" below in the: > > %0 = tail call i32 (...)* @__FFF (i32 8) nounwind; <i32> [#uses=1] > > that is, the return register. What information do you want, exactly? In your example, %0 is the CallInst. So if you have CallInst *ci = CallInst::Create(... then use `ci' whenever