supposed to pull "sticky labels" into the cumulative flattened
layout. Because it failed to check for the "sticky" flag, it
would copy all labels, causing extraction time to go exponential
as the number of labels in the design increases. Based on this
correction, the extHierConnectFunc1() routine should be able to
be optimized by stopping the search for sticky labels on the first
non-sticky label, since extSubtreeFunc() ensures that all sticky
labels come first in the label list.
substrate more than once for the same subcell, since the substrate
extraction method scans the entire plane area; this was making
large standard cell layouts extract very slowly, as every component
cell was causing the substrate search to be repeated.
extraction: Fixed a problem causing long extraction times, at
least some of which had to do with a poor string hash function
implementation. Fixed a huge problem in ext2spice, where the
node merge function was particularly poorly implemented, causing
exponentially increasing processing times with layout size.
Corrected a minor issue with ext2spice where arguments were
improperly specified, causing unnecessary error messages to be
issued. Fixed an error in the "load -dereference" command option,
which again caused unnecessary error messages to be issued.
Changed .gitignore to ignore Depend files, which are now regenerated
on every build.
Tim Edwards