Comment 4 for bug 590113

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John Johansen (jjohansen) wrote :

Interesting find,

Sorry the optimization and debug option aren't properly documented yet partly because the options/names of options aren't finalized.

no-expr-simplify turns off tree expression simplification that is done before dfa creation. On simple trees it can slow down compilation some, as its an extra step that doesn't do anything beneficial, but this is well outside what it should be costing.