[PATCH] D147126: [NFC]add & to avoid copy

[Wang, Xin via Phabricator via llvm-commits]

XinWang10 created this revision.
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The elements in FragmentMap are big objects, use reference can get
better performance, as someone do in line 1912.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147126

Files:
  llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp


Index: llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp
===================================================================
--- llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp
+++ llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp
@@ -1921,7 +1921,7 @@
 
   // Build the map.
   AssignmentTrackingLowering::OverlapMap Map;
-  for (auto Pair : FragmentMap) {
+  for (auto &Pair : FragmentMap) {
     auto &Frags = Pair.second;
     for (auto It = Frags.begin(), IEnd = Frags.end(); It != IEnd; ++It) {
       DIExpression::FragmentInfo Frag = It->getFragmentOrDefault();


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