Index: lib/CodeGen/ItaniumCXXABI.cpp
===================================================================
--- lib/CodeGen/ItaniumCXXABI.cpp
+++ lib/CodeGen/ItaniumCXXABI.cpp
@@ -1390,6 +1390,10 @@
 }
 
 void ItaniumCXXABI::EmitInstanceFunctionProlog(CodeGenFunction &CGF) {
+  // Naked functions have no prolog.
+  if (CGF.CurFuncDecl->hasAttr<NakedAttr>())
+    return;
+
   /// Initialize the 'this' slot.
   EmitThisParam(CGF);
 
Index: lib/CodeGen/MicrosoftCXXABI.cpp
===================================================================
--- lib/CodeGen/MicrosoftCXXABI.cpp
+++ lib/CodeGen/MicrosoftCXXABI.cpp
@@ -1417,6 +1417,10 @@
 }
 
 void MicrosoftCXXABI::EmitInstanceFunctionProlog(CodeGenFunction &CGF) {
+  // Naked functions have no prolog.
+  if (CGF.CurFuncDecl->hasAttr<NakedAttr>())
+    return;
+
   EmitThisParam(CGF);
 
   /// If this is a function that the ABI specifies returns 'this', initialize
Index: test/CodeGenCXX/naked.cpp
===================================================================
--- /dev/null
+++ test/CodeGenCXX/naked.cpp
@@ -0,0 +1,13 @@
+// RUN: %clang_cc1 -emit-llvm %s -o - | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-windows -emit-llvm %s -o - | FileCheck %s
+
+class TestNaked {
+public:
+  void NakedFunction();
+};
+
+__attribute__((naked)) void TestNaked::NakedFunction() {
+  // CHECK-LABEL: define void @
+  // CHECK: call void asm sideeffect
+  asm("");
+}