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Make better use of inverting output adders #7

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antonblanchard opened this issue Oct 4, 2022 · 0 comments
Open

Make better use of inverting output adders #7

antonblanchard opened this issue Oct 4, 2022 · 0 comments

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@antonblanchard
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Some adder cells have inverting outputs (eg ASAP7). At the moment we add inverters to all outputs (S/COUT) but we should be able to avoid them in some cases.

One example is to alternate between adding inverters to the AB inputs and S outputs of chains of full adders, which avoids any inverters on the carry chain. This works because inverting all inputs of a full adder also inverts all of its outputs.

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