13. A computing device selected from the group consisting of a desktop computer, a laptop computer, a tablet computer, a smartphone, an application server computer, a virtual computing host computer, and a file server computer, for synthesizing a first description of a circuit into a second description of the circuit, comprising: a memory and a processor that are respectively configured to store and execute instructions, including instructions organized into: an analyzer to: receive the first description of the circuit, the circuit including at least a first circuit portion and a second circuit portion, the first description describing a first hierarchical structure for the first circuit portion, the second circuit portion, and components of the first circuit portion and the second circuit portion; and determine a first component that is described in the first description as being part of the first circuit portion and that has a commonality with a second component described in the first description as being part of the second circuit portion; a circuit portion synthesizer to: synthesize a shared circuit portion as a replacement for the determined first and second components; and synthesize a plurality of accessing circuit portions; and a circuit synthesizer to synthesize the second description of the circuit, the second description describing: a second hierarchical structure for the first circuit portion, the second circuit portion, and the components thereof, the second hierarchical structure being different than the first hierarchical structure; the shared circuit portion; the first circuit portion with an interface to the shared circuit portion instead of an individual description of the first component; and the second circuit portion with an interface to the shared circuit portion instead of an individual description of the second component; whereby the computing device synthesizes the first description of the circuit into the second description of the circuit.
13. A computing device selected from the group consisting of a desktop computer, a laptop computer, a tablet computer, a smartphone, an application server computer, a virtual computing host computer, and a file server computer, for synthesizing a first description of a circuit into a second description of the circuit, comprising: a memory and a processor that are respectively configured to store and execute instructions, including instructions organized into: an analyzer to: receive the first description of the circuit, the circuit including at least a first circuit portion and a second circuit portion, the first description describing a first hierarchical structure for the first circuit portion, the second circuit portion, and components of the first circuit portion and the second circuit portion; and determine a first component that is described in the first description as being part of the first circuit portion and that has a commonality with a second component described in the first description as being part of the second circuit portion; a circuit portion synthesizer to: synthesize a shared circuit portion as a replacement for the determined first and second components; and synthesize a plurality of accessing circuit portions; and a circuit synthesizer to synthesize the second description of the circuit, the second description describing: a second hierarchical structure for the first circuit portion, the second circuit portion, and the components thereof, the second hierarchical structure being different than the first hierarchical structure; the shared circuit portion; the first circuit portion with an interface to the shared circuit portion instead of an individual description of the first component; and the second circuit portion with an interface to the shared circuit portion instead of an individual description of the second component; whereby the computing device synthesizes the first description of the circuit into the second description of the circuit. 20. The computing device of claim 13 , wherein the shared circuit portion is not described in the first description of the first circuit portion or in the first description of the second circuit portion as being a shared circuit portion.