based on properties that can be traded with number of devices,
such as MOSFET width, by merging. This initial implementation
is somewhat limited, only dealing with properties that merge
by summing. Only devices that do not match at all in the other
circuit will be considered for merging. The feature includes
a command option "property ... merge ..." that allows control
over which devices can and cannot be merged.
variables to iterate over hash table contents. This led to the
inability to nest hash table iterators. Fixed by defining a
wrapper structure that holds the actual hash table plus the size
and iterator indexes. Not only does this solve the nesting
problem, but it also avoids the need to pass the hash table size
on every call, and that reduces the number of ways a hash table
subroutine can go wrong (e.g., cannot access the table out of
bounds simply by passing a size that is larger than was used to
initialize the table).
Tim Edwards