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    I wonder whether abstract interpretation could recover the missing codepaths more accurately. It sounds like some games, like Metroid 2, are missing quite a few codepaths because of potential actions which are available in the context of the quote but not used in the replay. I imagine that we could bound such abstract interpretation based on a limited number of divergent frames from the original quote; the quote might include all actions achievable within a few seconds or a minute of taking the controls, but still not the entire game.

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      This is very similar to the “lekktor” approach taken to shrink the .kkrieger binary.

      Both seem to be unsound, dynamic approaches to program slicing.