From fbcf676a65ea13d4c7c24e4942b583658d5fbc2b Mon Sep 17 00:00:00 2001
From: Anders Carlsson <andersca@mac.com>
Date: Thu, 31 Jan 2008 02:13:57 +0000
Subject: [PATCH] Make CallExpr::isBuiltinConstantExpr slightly more efficient.

llvm-svn: 46594
---
 clang/AST/Expr.cpp | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/clang/AST/Expr.cpp b/clang/AST/Expr.cpp
index 88c1b236e8ec..f02e817f0659 100644
--- a/clang/AST/Expr.cpp
+++ b/clang/AST/Expr.cpp
@@ -130,9 +130,16 @@ bool CallExpr::isBuiltinConstantExpr() const {
   if (!DRE)
     return false;
 
-  // We have a DeclRefExpr.
-  if (strcmp(DRE->getDecl()->getName(), 
-             "__builtin___CFStringMakeConstantString") == 0)
+  const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl());
+  if (!FDecl)
+    return false;
+    
+  unsigned builtinID = FDecl->getIdentifier()->getBuiltinID();
+  if (!builtinID)
+    return false;
+
+  // We have a builtin that is a constant expression
+  if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString)
     return true;
   return false;
 }