From be7b54889f06ba803f87f9bbb5d4f9ab82559544 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Wed, 12 Jan 2011 22:11:34 +0000
Subject: [PATCH] Add IR generation support for SizeOfPackExpr.

llvm-svn: 123332
---
 clang/lib/CodeGen/CGExprScalar.cpp           |  5 +++++
 clang/test/CodeGenCXX/variadic-templates.cpp | 12 ++++++++++++
 2 files changed, 17 insertions(+)
 create mode 100644 clang/test/CodeGenCXX/variadic-templates.cpp

diff --git a/clang/lib/CodeGen/CGExprScalar.cpp b/clang/lib/CodeGen/CGExprScalar.cpp
index 6b22fc48d4c5..f80304d6de6b 100644
--- a/clang/lib/CodeGen/CGExprScalar.cpp
+++ b/clang/lib/CodeGen/CGExprScalar.cpp
@@ -195,6 +195,11 @@ public:
     return Builder.CreateBitCast(V, ConvertType(E->getType()));
   }
 
+  Value *VisitSizeOfPackExpr(SizeOfPackExpr *E) {
+    return llvm::ConstantInt::get(ConvertType(E->getType()), 
+                                  E->getPackLength());
+  }
+    
   // l-values.
   Value *VisitDeclRefExpr(DeclRefExpr *E) {
     Expr::EvalResult Result;
diff --git a/clang/test/CodeGenCXX/variadic-templates.cpp b/clang/test/CodeGenCXX/variadic-templates.cpp
new file mode 100644
index 000000000000..5faeba4057cc
--- /dev/null
+++ b/clang/test/CodeGenCXX/variadic-templates.cpp
@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 -std=c++0x -triple x86_64-apple-darwin10 -emit-llvm -o - %s | FileCheck %s
+
+template<typename ...Types>
+int get_num_types(Types...) {
+  return sizeof...(Types);
+}
+
+// CHECK: define weak_odr i32 @_Z13get_num_typesIJifdEEispT_
+// CHECK: ret i32 3
+template int get_num_types(int, float, double);
+
+