From: Douglas Gregor <dgregor@apple.com>
Date: Wed, 21 Dec 2011 15:12:03 +0000 (+0000)
Subject: Implement a trivial, obvious optimization for deserialization of
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=87dd4f7f43593d86add23faab58e7393aaa2219f;p=clang

Implement a trivial, obvious optimization for deserialization of
redeclaration chains: only ever have the reader search for
redeclarations of the first (canonical) declaration, since we only
ever record redeclaration ranges for the that declaration. Searching
for redeclarations of non-canonical declarations will never find
anything, so it's a complete waste of time.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@147055 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Serialization/ASTReaderDecl.cpp b/lib/Serialization/ASTReaderDecl.cpp
index 77ea318dc0..163cbadcd3 100644
--- a/lib/Serialization/ASTReaderDecl.cpp
+++ b/lib/Serialization/ASTReaderDecl.cpp
@@ -1416,8 +1416,8 @@ void ASTDeclReader::VisitRedeclarable(Redeclarable<T> *D) {
   }
 
   // Note that we need to load the other declaration chains for this ID.
-  if (Reader.PendingDeclChainsKnown.insert(ThisDeclID))
-    Reader.PendingDeclChains.push_back(ThisDeclID);
+  if (Reader.PendingDeclChainsKnown.insert(FirstDeclID))
+    Reader.PendingDeclChains.push_back(FirstDeclID);
 }
 
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