Minor CFG optimization: don't create separate block-level expressions for DeclStmt...

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@47771 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/AST/CFG.cpp b/AST/CFG.cpp
index ed9b320023d4521743ed85be8eff42b8b0c7dc38..0cab1f1b5c7431b68ac4b4d87c9f1919da263416 100644 (file)
--- a/AST/CFG.cpp
+++ b/AST/CFG.cpp
@@ -402,8 +402,21 @@ CFGBlock* CFGBuilder::WalkAST_VisitDeclSubExprs(StmtIterator& I) {
   Stmt* S = *I;
   ++I;
   WalkAST_VisitDeclSubExprs(I);
+    
+  // Optimization: Don't create separate block-level statements for literals.
+  
+  switch (S->getStmtClass()) {
+    case Stmt::IntegerLiteralClass:
+    case Stmt::CharacterLiteralClass:
+    case Stmt::StringLiteralClass:
+      break;
+      
+      // All other cases.
+      
+    default:
+      Block = addStmt(S);
+  }
   
-  Block = addStmt(S);
   return Block;
 }