cache kwg.seek results and reuse GADDAG state for extension sets#17
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cache kwg.seek results and reuse GADDAG state for extension sets#17
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Within the reverse scan, reuse cached GADDAG seek results for tile positions where the tile hasn't changed and the group boundary (empty/nonempty transition) is in the same place. Each tile group starts from p=1, so unchanged tiles from the right edge of a group have identical seek chains. Only calls kwg.seek() for positions where the tile changed or a group boundary moved, skipping the linear sibling scan for the rest. Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
The cross set reverse scan and extension set computation both traverse the same strip right-to-left with kwg.seek(). Read the cached GADDAG state (p) from cross_set_buffer instead of recomputing it, eliminating all kwg.seek() calls from gen_extension_sets. Across extension sets reuse cross_set_buffer_for_down_plays (both process rows). Down extension sets reuse cross_set_buffer_for_across_plays (both process columns). Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
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Summary
Test plan