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Logic Resizing

Correctly sizing logic elements
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Description

Upsizing improves slew times, reducing dynamic current. Downsizing reduces leakage current. To be effective, sizing operations must include accurate switching information.
In design with low-power intent, synthesis tools automatically perform a variety of power optimization techniques, including logic resizing.

By removing a buffer to reduce gate counts, logic resizing reduces dynamic power. In the figure, there are also fewer stages; both gate count and stage reduction can reduce power and also, usually, area.

On a sample of designs, logic resizing reduced dynamic power by less than 5% but could also reduce area by up to 10%. It had no significant impact on any other aspects of the design flow.

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