From 14d1a66e677932d20a2ba6f440e310b2bd57931b Mon Sep 17 00:00:00 2001
From: Greg Bedwell <greg_bedwell@sn.scee.net>
Date: Mon, 4 Jun 2018 12:30:10 +0000
Subject: [llvm-mca][UpdateTestChecks] Prevent an IndexError being raised when
 given empty input

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333894 91177308-0d34-0410-b5e6-96231b3b80d8
---
 utils/update_mca_test_checks.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'utils/update_mca_test_checks.py')

diff --git a/utils/update_mca_test_checks.py b/utils/update_mca_test_checks.py
index f99ca343f96..dcd52f6e913 100755
--- a/utils/update_mca_test_checks.py
+++ b/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 = []
-- 
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