CellUnionFromDifference: Optimize #252
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benguild
commented
Dec 25, 2025
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| // cellUnionDifferenceInternal adds (xid - y) to the CellUnion. It subdivides | ||
| // xid when there is partial overlap, narrowing y before recursing. | ||
| func (cu *CellUnion) cellUnionDifferenceInternal(xid CellID, y CellUnion) { |
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I moved this prior to the exported method to match C++ and have better proximity.
benguild
commented
Dec 25, 2025
| var cu CellUnion | ||
| for _, xid := range x { | ||
| cu.cellUnionDifferenceInternal(xid, &y) | ||
| cu.cellUnionDifferenceInternal(xid, y) |
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It seemed OK to pass by value
benguild
commented
Dec 25, 2025
| return | ||
| } | ||
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| y = y[lo:hi] |
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By reducing the size of "y" we're narrowing the search in the call to "ContainsCellID" and in recursive calls.
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Are there benchmarks for this? |
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Title explains, I'll include comment(s) in the diff. I think this is correct (?) and tried to expand the tests as well, but please let me know if you see any issues.