1 files changed, 84 insertions, 0 deletions
diff --git a/test/CodeGenCXX/nrvo.cpp b/test/CodeGenCXX/nrvo.cpp
new file mode 100644
index 0000000..9ee5536
--- /dev/null
+++ b/test/CodeGenCXX/nrvo.cpp
@@ -0,0 +1,84 @@
+// RUN: %clang_cc1 -emit-llvm -O1 -o - %s | FileCheck %s
+// RUN: %clang_cc1 -emit-llvm -fexceptions -o - %s | FileCheck --check-prefix=CHECK-EH %s
+
+// Test code generation for the named return value optimization.
+class X {
+public:
+  X();
+  X(const X&);
+  ~X();
+};
+
+// CHECK: define void @_Z5test0v
+// CHECK-EH: define void @_Z5test0v
+X test0() {
+  X x;
+  // CHECK-NOT: call void @_ZN1XD1Ev
+  // CHECK: ret void
+  // CHECK-EH: br label
+  // CHECK-EH: call void @_ZN1XD1Ev
+  // CHECK-EH: br label
+  // CHECK-EH: invoke void @_ZN1XD1Ev
+  // CHECK-EH: ret void
+  return x;
+}
+
+// CHECK: define void @_Z5test1b(
+X test1(bool B) {
+  // CHECK: call void @_ZN1XC1Ev
+  X x;
+  // CHECK-NOT: call void @_ZN1XD1Ev
+  // CHECK: ret void
+  if (B)
+    return (x);
+  return x;
+  // CHECK-EH: invoke void @_ZN1XD1Ev
+}
+
+// CHECK: define void @_Z5test2b
+// CHECK-EH: define void @_Z5test2b
+X test2(bool B) {
+  // No NRVO
+  // CHECK: call void @_ZN1XC1Ev
+  X x;
+  // CHECK: call void @_ZN1XC1Ev
+  X y;
+  // CHECK: call void @_ZN1XC1ERKS_
+  // CHECK-EH: invoke void @_ZN1XC1ERKS_
+  if (B)
+    return y;
+  // CHECK: call void @_ZN1XC1ERKS_
+  // CHECK-EH: invoke void @_ZN1XC1ERKS_
+  return x;
+  // CHECK: call void @_ZN1XD1Ev
+  // CHECK: call void @_ZN1XD1Ev
+  // CHECK: ret void
+  // CHECK-EH: invoke void @_ZN1XD1Ev
+  // CHECK-EH: invoke void @_ZN1XD1Ev
+}
+
+X test3(bool B) {
+  // FIXME: We don't manage to apply NRVO here, although we could.
+  {
+    X y;
+    return y;
+  }
+  X x;
+  return x;
+}
+
+extern "C" void exit(int) throw();
+
+// CHECK: define void @_Z5test4b
+X test4(bool B) {
+  {
+    // CHECK: tail call void @_ZN1XC1Ev
+    X x;
+    // CHECK: br i1
+    if (B)
+      return x;
+  }
+  // CHECK: tail call void @_ZN1XD1Ev
+  // CHECK: tail call void @exit(i32 1)
+  exit(1);
+}