From: Aaron Ballman <aaron@aaronballman.com>
Date: Tue, 16 Aug 2016 14:48:39 +0000 (+0000)
Subject: Reduce the number of allocations required for AST attributes. In test cases, the... 
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=5d7cb14e4beeb4b742fd5c117e47e95c0b0bad1d;p=clang

Reduce the number of allocations required for AST attributes. In test cases, the max resident memory changed from 65760k to 64476k which is 1.9% improvement. Allocations in grow_pod changed from 8847 to 4872 according to tcmalloc heap profiler. Overall running time remained the same.

Patch by Eugene Kosov

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@278812 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/clang/AST/AttrIterator.h b/include/clang/AST/AttrIterator.h
index a0c803096a..fb9b049e5d 100644
--- a/include/clang/AST/AttrIterator.h
+++ b/include/clang/AST/AttrIterator.h
@@ -39,8 +39,7 @@ void operator delete[](void *Ptr, const clang::ASTContext &C, size_t);
 namespace clang {
 
 /// AttrVec - A vector of Attr, which is how they are stored on the AST.
-typedef SmallVector<Attr*, 2> AttrVec;
-typedef SmallVector<const Attr*, 2> ConstAttrVec;
+typedef SmallVector<Attr *, 4> AttrVec;
 
 /// specific_attr_iterator - Iterates over a subrange of an AttrVec, only
 /// providing attributes that are of a specific type.