From: Wei Mi <wmi@google.com>
Date: Fri, 8 Mar 2019 23:29:46 +0000 (+0000)
Subject: [RegisterCoalescer][NFC] bind a DenseMap access to a reference to avoid
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=7124801b6f19b757ce2e75b2f716c5397ef7a2a0;p=llvm

[RegisterCoalescer][NFC] bind a DenseMap access to a reference to avoid
repeated lookup operations



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@355757 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/RegisterCoalescer.cpp b/lib/CodeGen/RegisterCoalescer.cpp
index f144c99cdd4..237cf184d8b 100644
--- a/lib/CodeGen/RegisterCoalescer.cpp
+++ b/lib/CodeGen/RegisterCoalescer.cpp
@@ -3277,8 +3277,9 @@ void RegisterCoalescer::mergeSubRangeInto(LiveInterval &LI,
 bool RegisterCoalescer::isHighCostLiveInterval(LiveInterval &LI) {
   if (LI.valnos.size() < LargeIntervalSizeThreshold)
     return false;
-  if (LargeLIVisitCounter[LI.reg] < LargeIntervalFreqThreshold) {
-    LargeLIVisitCounter[LI.reg]++;
+  auto &counter = LargeLIVisitCounter[LI.reg];
+  if (counter < LargeIntervalFreqThreshold) {
+    counter++;
     return false;
   }
   return true;