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...escribes a self-loop block. The same problem can occur in loops with more than 1 block, as our example shows. In general, this can happen when the predecessor being removed does not belong to the same loop level as the basic block containing the PhiNode. 2. The version which introduced this comment r2694 did implement the self-loop case okay. A subsequent change - revision 22664 - broke this. The revision 22664 dates back to 2005, so this issue probably has been around for 10 years. I am not sure why nobody else has seen a problem here. I saw this issue in a large testcase. I will try to get a sm...