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You are probably calling setName() on the called Function, which in-turned renamed the called Function instead of replacing the called function. Depending on your use-case, if you are certain that you only need to modify CallInsts, then you could simply call CallInst::setCalledFunction , otherwise it’s probably wiser to use CallSite as a wrapper for both CallInst and InvokeInst. Do note, however,

Hello, In my module I have functions: a b c f3 calls "a" f2 calls "a" f1 calls "b" I would like to modify a CallInst in the f2. Now it calls "a", but I want changed it to "c". When loop over the instructions of the f2, I can get a CallInst to be modified, then I use "setName" to changed it to "c". Problem is, since