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...yself? You get to take care of it yourself. If it is the later what's the best way to handle that? (from > what I could see I would need to iterate over all the instructions in the > target BB and fix PHI Nodes if the target block becomes unreachable). TargetBB->removePredecessor(SwitchBB). Note that you should call this before you call removeCase! Nick

Hi, I've been writing an optimization pass (described on the ML previously). Sometimes this pass removes some case entries from switch instructions, which cause an abort because removeCase() doesn't fix the PHINodes predecessors when needed. e.g.: define i32 @foo() nounwind { ifthen: %call = call i32 @bar() switch i32 %call, label %myphi [ i32 0, label %ifelse i32 1, label