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Fix asymptotic performance issues in live variables analysis. #78

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gnovark
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@gnovark gnovark commented Jul 4, 2014

Fix possibly-exponential runtime for DFS graph searches. Improve DFA fixpoint algorithm to correctly compute worklist of only changed nodes for each iteration.

Added test that takes > 2 minutes to compile without these improvements.

Fix possibly-exponential runtime for DFS graph searches.  Improve DFA fixpoint algorithm to correctly compute worklist of only changed nodes for each iteration.

Added test that takes > 2 minutes to compile without these improvements.
@retronym
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Thanks! I'm resubmitting this to the 2.10.x branch.

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