When does DC optimize the addera operator?

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5life

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We know that the adder is inferred by elaborate command .

And I wonder when the adder's optimization based on the design constraints performs , elaborate or compile process?
 

The architecture of the adder depends on the timing/area constraints applied. THe architecture will be selected (say ripple carry or CLA or CSA or Brent Kung.... from DW foundation library) during compile command.

Regards
 

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