time ago by cleaning up excess usage of "equiv" lines in the .ext
file output. The hierarchical extraction code did not distinguish
between node names which were output and those that were not,
requiring a setting "extract do aliases" to force all node aliases
to be output with "equiv" statements. So hierarchical names
might be any alias, whether output or not, and "merge" and "cap"
lines might contain references to nodes that were not output,
causing them to be disconnected nodes. This fix handles the
"extract no aliases" (default) case by flagging node names that
are redundant and not output, and not creating hierarchical names
with them.
entries for "floating" labels. Otherwise it is possible for the
hierarchical checks to find the label in flattened geometry and
reference it, resulting in merge statements in an .ext file that
reference undeclared nodes, ultimately resulting in extflat
failing to perform the merge, and an incorrect netlist.
such that it looks for material connecting to the label at the
center point of the label and not the lower left corner. This keeps
the behavior of looking for tiles on the corners of a degenerate
label line or point between layers, but avoids problems with sticky
labels that are not quite aligned with the rectangle (due to certain
commercial EDA tools that have a sloppier notion of labeling).
Tim Edwards