Imported Upstream version 5.18.0.179

Former-commit-id: 67aa10e65b237e1c4537630979ee99ebe1374215

external/llvm/tools/opt-viewer/opt-diff.py

@@ -0,0 +1,69 @@
+#!/usr/bin/env python2.7
+
+from __future__ import print_function
+
+desc = '''Generate the difference of two YAML files into a new YAML file (works on
+pair of directories too).  A new attribute 'Added' is set to True or False
+depending whether the entry is added or removed from the first input to the
+next.
+
+The tools requires PyYAML.'''
+
+import yaml
+# Try to use the C parser.
+try:
+    from yaml import CLoader as Loader
+except ImportError:
+    from yaml import Loader
+
+import optrecord
+import argparse
+from collections import defaultdict
+from multiprocessing import cpu_count, Pool
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description=desc)
+    parser.add_argument(
+        'yaml_dir_or_file_1',
+        help='An optimization record file or a directory searched for optimization '
+             'record files that are used as the old version for the comparison')
+    parser.add_argument(
+        'yaml_dir_or_file_2',
+        help='An optimization record file or a directory searched for optimization '
+             'record files that are used as the new version for the comparison')
+    parser.add_argument(
+        '--jobs',
+        '-j',
+        default=cpu_count(),
+        type=int,
+        help='Max job count (defaults to %(default)s, the current CPU count)')
+    parser.add_argument(
+        '--no-progress-indicator',
+        '-n',
+        action='store_true',
+        default=False,
+        help='Do not display any indicator of how many YAML files were read.')
+    parser.add_argument('--output', '-o', default='diff.opt.yaml')
+    args = parser.parse_args()
+
+    files1 = optrecord.find_opt_files(args.yaml_dir_or_file_1)
+    files2 = optrecord.find_opt_files(args.yaml_dir_or_file_2)
+
+    print_progress = not args.no_progress_indicator
+    all_remarks1, _, _ = optrecord.gather_results(files1, args.jobs, print_progress)
+    all_remarks2, _, _ = optrecord.gather_results(files2, args.jobs, print_progress)
+
+    added = set(all_remarks2.values()) - set(all_remarks1.values())
+    removed = set(all_remarks1.values()) - set(all_remarks2.values())
+
+    for r in added:
+        r.Added = True
+    for r in removed:
+        r.Added = False
+
+    result = added | removed
+    for r in result:
+        r.recover_yaml_structure()
+
+    with open(args.output, 'w') as stream:
+        yaml.dump_all(result, stream)