--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/utils/schedcover.py	Mon May 25 11:07:02 2020 +0900
@@ -0,0 +1,86 @@
+#!/usr/bin/python
+
+# This creates a CSV file from the output of the debug output of subtarget:
+#   llvm-tblgen --gen-subtarget --debug-only=subtarget-emitter
+# With thanks to Dave Estes for mentioning the idea at 2014 LLVM Developers' Meeting
+
+import os;
+import sys;
+import re;
+import operator;
+
+table = {}
+models = set()
+filt = None
+
+def add(instr, model, resource=None):
+    global table, models
+
+    entry = table.setdefault(instr, dict())
+    entry[model] = resource
+    models.add(model)
+
+def filter_model(m):
+    global filt
+    if m and filt:
+        return filt.search(m) != None
+    else:
+        return True
+
+
+def display():
+    global table, models
+
+    # remove default and itinerary so we can control their sort order to make
+    # them first
+    models.discard("default")
+    models.discard("itinerary")
+
+    ordered_table  = sorted(table.items(), key=operator.itemgetter(0))
+    ordered_models = ["itinerary", "default"]
+    ordered_models.extend(sorted(models))
+    ordered_models = [m for m in ordered_models if filter_model(m)]
+
+    # print header
+    sys.stdout.write("instruction")
+    for model in ordered_models:
+        sys.stdout.write(", {}".format(model))
+    sys.stdout.write(os.linesep)
+
+    for (instr, mapping) in ordered_table:
+        sys.stdout.write(instr)
+        for model in ordered_models:
+            if model in mapping and mapping[model] is not None:
+                sys.stdout.write(", {}".format(mapping[model]))
+            else:
+                sys.stdout.write(", ")
+        sys.stdout.write(os.linesep)
+
+
+def machineModelCover(path):
+    # The interesting bits
+    re_sched_default  = re.compile("SchedRW machine model for ([^ ]*) (.*)\n");
+    re_sched_no_default = re.compile("No machine model for ([^ ]*)\n");
+    re_sched_spec = re.compile("InstRW on ([^ ]*) for ([^ ]*) (.*)\n");
+    re_sched_no_spec = re.compile("No machine model for ([^ ]*) on processor (.*)\n");
+    re_sched_itin = re.compile("Itinerary for ([^ ]*): ([^ ]*)\n")
+
+    # scan the file
+    with open(path, 'r') as f:
+        for line in f.readlines():
+            match = re_sched_default.match(line)
+            if match: add(match.group(1), "default", match.group(2))
+            match = re_sched_no_default.match(line)
+            if match: add(match.group(1), "default")
+            match = re_sched_spec.match(line)
+            if match: add(match.group(2), match.group(1), match.group(3))
+            match = re_sched_no_spec.match(line)
+            if match: add(match.group(1), match.group(2))
+            match = re_sched_itin.match(line)
+            if match: add(match.group(1), "itinerary", match.group(2))
+
+    display()
+
+if len(sys.argv) > 2:
+    filt = re.compile(sys.argv[2], re.IGNORECASE)
+machineModelCover(sys.argv[1])