[llvm] r345499 - [llvm-mca][UpdateTestChecks] Don't try to align blocks that have already been subject to alignment in update_mca_test_checks.py

[Greg Bedwell via llvm-commits]

Author: gbedwell
Date: Mon Oct 29 06:24:20 2018
New Revision: 345499

URL: http://llvm.org/viewvc/llvm-project?rev=345499&view=rev
Log:
[llvm-mca][UpdateTestChecks] Don't try to align blocks that have already been subject to alignment in update_mca_test_checks.py

This fixes PR39466.

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=345499&r1=345498&r2=345499&view=diff
==============================================================================
--- llvm/trunk/utils/update_mca_test_checks.py (original)
+++ llvm/trunk/utils/update_mca_test_checks.py Mon Oct 29 06:24:20 2018
@@ -267,10 +267,14 @@ def _align_matching_blocks(all_blocks, f
         continue
 
       changed = False
-      while(index < farthest_indexes[block]):
-        blocks.insert(index, '')
-        index += 1
-        changed = True
+      # If the block has not already been subject to alignment (i.e. if the
+      # previous block is not empty) then insert empty blocks until the index
+      # matches the farthest index identified for that block.
+      if (index > 0) and blocks[index - 1]:
+        while(index < farthest_indexes[block]):
+          blocks.insert(index, '')
+          index += 1
+          changed = True
 
       if changed:
         # Bail out.  We'll need to re-do the farthest block analysis now that