From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Fri, 9 Aug 2013 09:39:17 +0000 (+0000)
Subject: Put back a microoptimization with a comment to make it more obvious.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=541a28f4eed4b2d8c057d5c51142d176c9c561de;p=clang

Put back a microoptimization with a comment to make it more obvious.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@188063 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Sema/SemaChecking.cpp b/lib/Sema/SemaChecking.cpp
index ed4a034675..99a1f77390 100644
--- a/lib/Sema/SemaChecking.cpp
+++ b/lib/Sema/SemaChecking.cpp
@@ -716,13 +716,16 @@ void Sema::checkCall(NamedDecl *FDecl,
   // Printf and scanf checking.
   llvm::SmallBitVector CheckedVarArgs;
   if (FDecl) {
-    CheckedVarArgs.resize(Args.size());
     for (specific_attr_iterator<FormatAttr>
              I = FDecl->specific_attr_begin<FormatAttr>(),
              E = FDecl->specific_attr_end<FormatAttr>();
-         I != E; ++I)
+         I != E; ++I) {
+      // Only create vector if there are format attributes.
+      CheckedVarArgs.resize(Args.size());
+
       CheckFormatArguments(*I, Args, IsMemberFunction, CallType, Loc, Range,
                            CheckedVarArgs);
+    }
   }
 
   // Refuse POD arguments that weren't caught by the format string