When constant folding reference variables with an initializer to the

initializer, don't fold paramters. Their initializers are just default
arguments which can be overridden. This fixes some spectacular regressions due
to more things making it into the constant folding.

llvm-svn: 103904

1 files changed, 13 insertions, 0 deletions

diff --git a/clang/test/CodeGenCXX/references.cpp b/clang/test/CodeGenCXX/references.cpp
index 5a5947dd816..3ae1e474f88 100644
--- a/clang/test/CodeGenCXX/references.cpp
+++ b/clang/test/CodeGenCXX/references.cpp
@@ -155,3 +155,16 @@ void f0(s1 a) { s1 b = a; }
 // CHECK: load
 // CHECK: ret
 const int &f2() { return 0; }
+
+// Don't constant fold const reference parameters with default arguments to
+// their default arguments.
+namespace N1 {
+  const int foo = 1;
+  // CHECK: @_ZN2N14test
+  int test(const int& arg = foo) {
+    // Ensure this array is on the stack where we can set values instead of
+    // being a global constant.
+    // CHECK: %args_array = alloca
+    const int* const args_array[] = { &arg };
+  }
+}