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...nual.html#adding-debug-counters-to-aid-in-debugging-your-code> provides features for me to have an in-pass (transformation) level limit to tell which transform in the pass exactly caused the error. When we set StopAfter value for a DebugCounter, it will eventually stop there as a limit. And in D50031 <https://reviews.llvm.org/D50031> and rL337748 <https://reviews.llvm.org/rL337748>, I added a method to print DebugCounter info: the `-print-debug-counter` flag. With this, writing a transformation level bisection script will be more straightforward. The issue we face is that the trans...