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GNU Cauldron 2012, Prague, talk6: Part 2/2

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Published on Jul 19, 2012

Straight-line strength reduction in GCC

Presenter: Bill Schmidt

GCC has long lacked a strength reduction capability outside of loops. Previous attempts to address this within existing frameworks, such as partial redundancy elimination, have not been successful. A primary reason for this is that these frameworks process individual expressions independently. For strength reduction, a determination of profitability often requires examining chains of related strength reduction candidates. This short presentation will demonstrate the issues involved and outline a new SSA dominator-based proposal for efficiently performing non-loop strength reduction.

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