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11 - 380C Last Time Today andregisterusage...

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  Lecture 11            CS 380C                1 380C Last Time Interactions of scheduling  and register usage Today Interactions of scheduling  and instruction level  parallelism
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  Lecture 11            Shape of Expressions Proebsting & Fischer assume a fixed expression  tree  Hunt et al. reorganize commutative and  associative operations in expression trees to  Increase ILP Decrease critical path length Group constants
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  Lecture 11            Motivation Long pipelines and fine grain parallel processors  (e.g., SuperScalar RISC, VLIW & EDGE)  benefit from instruction  level parallelism. Decreasing critical path length improves loop  performance Grouping constants improves constant  propagation.
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  Lecture 11            Example Let M denote intermediate values we  need to preserve.
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