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Rewrite op_bitmaps to process the bitmaps in u64x8 chunks via fearless_simd, computing the result cardinality alongside the operation. Per-byte popcounts accumulate in a u8x64 and are widened into a u16x32 every 16 chunks, before the u8 lanes can overflow. Move the SIMD level() helper from array_store::vector to the crate root so the bitmap store can share it.
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Rewrite op_bitmaps to process the bitmaps in u64x8 chunks via fearless_simd, computing the result cardinality alongside the operation. Per-byte popcounts accumulate in a u8x64 and are widened into a u16x32 every 16 chunks, before the u8 lanes can overflow.
Move the SIMD level() helper from array_store::vector to the crate root so the bitmap store can share it.