Support abc9_box on ordinary modules in abc_new
#4737
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`$extern:...` modules inserted by `techmap -extern` are special in the regard that they have a private ID (starting with a dollar sign) but are not an internal cell. Support those modules in xaiger export.
Previously the `abc9_box` mode was reserved to modules with the `blackbox` or `whitebox` attribute. Allow `abc9_box` on ordinary modules when doing hierarchical synthesis.
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What are the reasons/motivation for this change?
To preserve boundaries of arithmetic operators, we want to isolate them into a new module which will become part of the design hierarchy. Ordinarily this would mean segmenting the timing paths for the technology mapper within ABC, but with new changes to
abc_newwe support having those be abc9 boxes with their propagation arcs described to the mapper.Internally this calls the new
portarcscommand (PR #4736) once the module to be boxed has been technology-mapped.In addition this PR allows applying different ABC scripts per module.