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This is excellent Chandler. We spoke before about wanting to keep running things like InstCombine and SimplifyCFG in a loop until stabilization. This will make doing that much easier. I think some of the idea for this work might have come from a patch i tried to submit a few weeks ago on reducing recomputing the dom tree, in which you commented that we need to fix the pass manager. In that

John Criswell <criswell at illinois.edu> writes: > 2) Rerunning analysis group passes after invalidation.  If you want to > use an analysis other than the default analysis group, you have to > manually specify where to use it each time in the pass pipeline.  If > your non-default pass gets invalidated, then the default is used by > any other transform that requests an