feat: Add prefix-collapse optimization for alternation branches#359
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feat: Add prefix-collapse optimization for alternation branches#359
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Merge structurally identical successor instructions into one with combined successors. Reduces instruction count for patterns like `[(object ...) (object ...)]`. Also fixes collapse_up to count predecessors before removing shared labels.
zharinov
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Summary
collapse_upto count predecessors before removing shared labelsWhy
Patterns like
[(object (pair)) (object (string))]generate duplicate(object)instructions that differ only in successors. This pass merges them, reducing instruction count.Notes
Not a frequent optimization trigger, but reduces bytecode size when it applies.