Minor CFG optimization: don't create separate block-level expressions for DeclStmt initializers when the initializer is a literal.

llvm-svn: 47771

1 files changed, 14 insertions, 1 deletions

diff --git a/clang/AST/CFG.cpp b/clang/AST/CFG.cpp
index ed9b320023d..0cab1f1b5c7 100644
--- a/clang/AST/CFG.cpp
+++ b/clang/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;
 }