[llvm-mca][UpdateTestChecks] Prevent an IndexError being raised when given empty input

llvm-svn: 333894
2018-06-04 12:30:10 +00:00 · 2018-06-04 12:30:10 +00:00 · 96f51f09d4
parent bbe64af0a0
commit 96f51f09d4
1 changed files with 1 additions and 1 deletions
--- a/llvm/utils/update_mca_test_checks.py
+++ b/llvm/utils/update_mca_test_checks.py
@ -409,7 +409,7 @@ def _write_output(test_path, input_lines, prefix_list, block_infos,  # noqa
      continue

  # Add a blank line before the new checks if required.
-  if output_lines[-1]:
+  if len(output_lines) > 0 and output_lines[-1]:
    output_lines.append('')

  output_check_lines = []