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Summary
Tiling is a well-known optimization that has been used to obtain
orders of magnitude performance gains. Hierarchical Tiling explores
the new issues that arise when tiling for multiple levels of
parallelism and memory hierarchies. Our recent work is focused on the
Coordinated Restructruing Of Programs and Storage (CROPS). The goal of
the CROPS project is to extend tiling and related optimization
techniques to obtain their advantages on a larger class of programs
than perfectly nested loops with regular data dependences. We aim to
extend coverage to unstructured applications and those with less
regular memory accesses. We are working on tiling extensions for
non-affine array references, coordination of storage mapping and
tiling, and guidance and tradeoffs for parallel
execution. Hierarchical tiling and CROPS are supported by NSF grants
CCR-9504150 and CCR-9808946.
