Localizing bypass capacitance for the purpose of reducing or eliminating noise in power supplies in an integrated circuit (IC). After a data path block of macro cells has been constructed by the IC designer, a determination is made as to which cells of the macro cells comprise functionality that will not be used by the IC when it is operating. At least a plurality of cells that are determined to be cells that comprise functionality that will not be used when the IC is operating are filled with bypass capacitors. Because there are typically a large number of cells that will not be used when the IC is operating, filling a plurality or all of these cells with bypass capacitors ensures that bypass capacitors will be located in close proximity to power supplies on the IC, which ensures that the bypass capacitors will be effective at reducing or eliminating noise in the power supplies.
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