When building the structured initializer list, pre-allocate storage in
its vectors based on the subobject type we're initializing and the
(unstructured) initializer list. This eliminates some malloc thrashing
when parsing initializers (from 117 vector reallocations down to 0
when parsing Cocoa.h). We can't always pre-allocate the right amount
of storage, since designated initializers can cause us to initialize
in non-predictable patterns.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67421 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/Expr.cpp b/lib/AST/Expr.cpp
index fd1092f..330ba63 100644
--- a/lib/AST/Expr.cpp
+++ b/lib/AST/Expr.cpp
@@ -338,6 +338,11 @@
InitExprs.insert(InitExprs.end(), initExprs, initExprs+numInits);
}
+void InitListExpr::reserveInits(unsigned NumInits) {
+ if (NumInits > InitExprs.size())
+ InitExprs.reserve(NumInits);
+}
+
void InitListExpr::resizeInits(ASTContext &Context, unsigned NumInits) {
for (unsigned Idx = NumInits, LastIdx = InitExprs.size();
Idx < LastIdx; ++Idx)