M8: Grid auto-placement on an occupancy bitmap (#1593)

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* M8: grid auto-placement on an occupancy bitmap (#1083)

Grid placement tested every cell of a child's span at every position it tried. The taken cells are now a bitmap: spans are checked a 64-bit word at a time, the search jumps past the blocking cell, a row's search ORs the span's rows once, and a column-anchored child looks on from where the last one with the same column and spans found room. Placements are unchanged (checked against the old search on random grids); a crafted 1000 x 1000 grid takes 0.3 ms instead of 192 ms.

* M8: grid occupancy stores rows only once a cell in them is taken

An empty or sparse grid no longer allocates the whole bitmap up front (CodeRabbit on #1593).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Co-authored-by: Brandon Thomas <echelon@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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2026-10-30 08:56:43 +07:00

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co-authored by Claude Opus 5.5 Brandon Thomas

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