[llvm] r333894 - [llvm-mca][UpdateTestChecks] Prevent an IndexError being raised when given empty input

[Greg Bedwell via llvm-commits]

Author: gbedwell
Date: Mon Jun  4 05:30:10 2018
New Revision: 333894

URL: http://llvm.org/viewvc/llvm-project?rev=333894&view=rev
Log:
[llvm-mca][UpdateTestChecks] Prevent an IndexError being raised when given empty input

Modified:
    llvm/trunk/utils/update_mca_test_checks.py

Modified: llvm/trunk/utils/update_mca_test_checks.py
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/update_mca_test_checks.py?rev=333894&r1=333893&r2=333894&view=diff
==============================================================================
--- llvm/trunk/utils/update_mca_test_checks.py (original)
+++ llvm/trunk/utils/update_mca_test_checks.py Mon Jun  4 05:30:10 2018
@@ -409,7 +409,7 @@ def _write_output(test_path, input_lines
       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 = []