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Compiler code transformations for superscalar-based high-performance systems

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6 Author(s)

A set of compiler transformations designed to increase instruction-level parallelism is described. The effectiveness of these transformations is evaluated using 40 loop nests extracted from a range of supercomputer applications. This evaluation shows that increasing execution resources in superscalar/VLIW node processors yields little performance improvement unless loop unrolling and register renaming are applied. It also reveals that these two transformations are sufficient for DOALL loops. However, more advanced transformations are required in order for serial and DOACROSS loops to fully benefit from the increased execution resources. The results show that the six additional transformations studied satisfy most of this need

Published in:

Supercomputing '92., Proceedings

Date of Conference:

16-20 Nov 1992