this limited ports to 16384, which seemed reasonable at the time.
However, the sky130_sram_macro layouts connect power and ground in a
way that when coupled with "extract unique" can generate tens of
thousands of ports and overrun the bit field, showing that automation
can do the unexpected. The solution was to split out the port number
from the label record as its own 32-bit value.
an optional extra argument to the "select" command that can be used
to select labels by glob-style matching; e.g., "select area labels
VSS*" or "select less area labels *_1". This will help in managing
labels after flattening a standard cell design; e.g., by using
"select less area labels */VDD".
unique" code. It was using DBEraseLabelsByContent() which would
erase all matching labels, and could potentially erase labels that
were still remaining on the list being processed, causing a segfault.
Also corrected minor errors identified by valgrind during debugging
the above-referenced problem.
to copy and search on a label that already exists in the flattened,
copied database. Otherwise multiple labels on a single net can cause
the search to go into an infinite loop, repeatedly copying and erasing
the same label over and over again.
label specified as having type "space" automatically overrides
the "no-reconnect-labels" flag. Modified the behavior of the
label reconnect algorithm so that it searches by plane order so
that material on the highest plane that matches the reconnection
criteria is chosen over similar materials on lower planes.
Anton Blanchard
Tim Edwards