Fix default_fanout_load
Some of the sky130 liberty files have default_fanout_load set to 1,
others have it set to 0. When set to 0 all fan out management and
violation reporting is disabled, so change any instances of 0 to 1.
diff --git a/sky130/Makefile.in b/sky130/Makefile.in
index 990b6fb..b9b547f 100644
--- a/sky130/Makefile.in
+++ b/sky130/Makefile.in
@@ -1248,6 +1248,7 @@
sort=../common/sort_pdkfiles.py \
-doc %l/latest/cells/*/*.pdf \
-lib %l/latest/timing/*.lib filter=custom/scripts/add_wireloads.py \
+ filter=custom/scripts/fix_default_fanout_load.py \
-gds %l/latest/cells/*/*.gds compile-only \
no-copy=custom/sky130_fd_sc_hd/gds/sky130_fd*.gds \
include=custom/sky130_fd_sc_hd/gds/sky130_ef*.gds \
@@ -1302,6 +1303,7 @@
sort=../common/sort_pdkfiles.py \
-doc %l/latest/cells/*/*.pdf \
-lib %l/latest/timing/*.lib filter=custom/scripts/add_wireloads.py \
+ filter=custom/scripts/fix_default_fanout_load.py \
-gds %l/latest/cells/*/*.gds compile-only \
options=custom/scripts/gds_import_setup.tcl \
sort=../common/sort_pdkfiles.py \
@@ -1341,6 +1343,7 @@
sort=../common/sort_pdkfiles.py \
-doc %l/latest/cells/*/*.pdf \
-lib %l/latest/timing/*.lib filter=custom/scripts/add_wireloads.py \
+ filter=custom/scripts/fix_default_fanout_load.py \
-gds %l/latest/cells/*/*.gds compile-only \
include=custom/sky130_fd_sc_hvl/gds/sky130_ef*.gds \
options=custom/scripts/gds_import_setup.tcl \
@@ -1387,6 +1390,7 @@
sort=../common/sort_pdkfiles.py \
-doc %l/latest/cells/*/*.pdf \
-lib %l/latest/timing/*.lib filter=custom/scripts/add_wireloads.py \
+ filter=custom/scripts/fix_default_fanout_load.py \
-gds %l/latest/cells/*/*.gds compile-only \
options=custom/scripts/gds_import_setup.tcl \
sort=../common/sort_pdkfiles.py \
@@ -1425,6 +1429,7 @@
sort=../common/sort_pdkfiles.py \
-doc %l/latest/cells/*/*.pdf \
-lib %l/latest/timing/*.lib filter=custom/scripts/add_wireloads.py \
+ filter=custom/scripts/fix_default_fanout_load.py \
-gds %l/latest/cells/*/*.gds compile-only \
no-copy=custom/sky130_fd_sc_hs/gds/sky130_fd*.gds \
options=custom/scripts/gds_import_setup.tcl \
@@ -1460,6 +1465,7 @@
sort=../common/sort_pdkfiles.py \
-doc %l/latest/cells/*/*.pdf \
-lib %l/latest/timing/*.lib filter=custom/scripts/add_wireloads.py \
+ filter=custom/scripts/fix_default_fanout_load.py \
-gds %l/latest/cells/*/*.gds compile-only \
options=custom/scripts/gds_import_setup.tcl \
sort=../common/sort_pdkfiles.py \
@@ -1494,6 +1500,7 @@
sort=../common/sort_pdkfiles.py \
-doc %l/latest/cells/*/*.pdf \
-lib %l/latest/timing/*.lib filter=custom/scripts/add_wireloads.py \
+ filter=custom/scripts/fix_default_fanout_load.py \
-gds %l/latest/cells/*/*.gds compile-only \
options=custom/scripts/gds_import_setup.tcl \
sort=../common/sort_pdkfiles.py \
diff --git a/sky130/custom/scripts/fix_default_fanout_load.py b/sky130/custom/scripts/fix_default_fanout_load.py
new file mode 100755
index 0000000..5fa3199
--- /dev/null
+++ b/sky130/custom/scripts/fix_default_fanout_load.py
@@ -0,0 +1,91 @@
+#!/usr/bin/env python3
+#
+# fix_default_fanout_load.py ---
+#
+# Some of the sky130 liberty files have default_fanout_load set to 1,
+# others have it set to 0. When set to 0 all fan out management and
+# violation reporting is disabled, so change any instances of 0 to 1.
+#
+# This script is a filter to be run by setting the name of this script as
+# the value to "filter=" for the lib install in the sky130 Makefile.
+
+import re
+import os
+import sys
+
+def filter(inname, outname):
+
+ # Read input
+ try:
+ with open(inname, 'r') as inFile:
+ stext = inFile.read()
+ slines = stext.splitlines()
+ except:
+ print('fix_default_fanout_load.py: failed to open ' + inname + ' for reading.', file=sys.stderr)
+ return 1
+
+ # Process input with regexp
+
+ fixedlines = []
+ modified = False
+
+ fanout_re = re.compile('\s*default_fanout_load\s*:\s*([\d\.]+)\s*;')
+
+ for line in slines:
+ lmatch = fanout_re.match(line)
+ if lmatch:
+ val_str = lmatch.group(1)
+ val = int(float(val_str))
+ if val == 0:
+ modified = True
+ line = line.replace(val_str, '1.0000000000')
+
+ fixedlines.append(line)
+
+ # Write output
+ if outname == None:
+ for i in fixedlines:
+ print(i)
+ else:
+ # If the output is a symbolic link but no modifications have been made,
+ # then leave it alone. If it was modified, then remove the symbolic
+ # link before writing.
+ if os.path.islink(outname):
+ if not modified:
+ return 0
+ else:
+ os.unlink(outname)
+ try:
+ with open(outname, 'w') as outFile:
+ for i in fixedlines:
+ print(i, file=outFile)
+ except:
+ print('fix_default_fanout_load.py: failed to open ' + outname + ' for writing.', file=sys.stderr)
+ return 1
+
+
+if __name__ == '__main__':
+
+ # This script expects to get one or two arguments. One argument is
+ # mandatory and is the input file. The other argument is optional and
+ # is the output file. The output file and input file may be the same
+ # name, in which case the original input is overwritten.
+
+ options = []
+ arguments = []
+ for item in sys.argv[1:]:
+ if item.find('-', 0) == 0:
+ options.append(item[1:])
+ else:
+ arguments.append(item)
+
+ if len(arguments) > 0:
+ infilename = arguments[0]
+
+ if len(arguments) > 1:
+ outfilename = arguments[1]
+ else:
+ outfilename = None
+
+ result = filter(infilename, outfilename)
+ sys.exit(result)
