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Quadtree matrices using Morton-order storage provide natural blocking on every level of a memory hierarchy. Writing the natural recursive algorithms to take advantage of this blocking results in code that honors the memory hierarchy without the need for transforming the code. Furthermore, the divide-and-conquer algorithm breaks problems down into independent computations. These independent computations can be dispatched in parallel for straightforward parallel processing. Proof-of-concept isdoi:10.1145/781498.781525 dblp:conf/ppopp/FrensW03 fatcat:cfbi5lk45rcodn64z24roxdx2i