diff --git a/src/x87/builtins-x87.cc b/src/x87/builtins-x87.cc
index 51bb3a7c65..b7be786a43 100644
--- a/src/x87/builtins-x87.cc
+++ b/src/x87/builtins-x87.cc
@@ -100,6 +100,42 @@ void Builtins::Generate_InOptimizationQueue(MacroAssembler* masm) {
 }
 
 
+static void Generate_Runtime_NewObject(MacroAssembler* masm,
+                                       bool create_memento,
+                                       Register original_constructor,
+                                       Label* count_incremented,
+                                       Label* allocated) {
+  int offset = 0;
+  if (create_memento) {
+    // Get the cell or allocation site.
+    __ mov(edi, Operand(esp, kPointerSize * 2));
+    __ push(edi);
+    offset = kPointerSize;
+  }
+
+  // Must restore esi (context) and edi (constructor) before calling
+  // runtime.
+  __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
+  __ mov(edi, Operand(esp, offset));
+  __ push(edi);
+  __ push(original_constructor);
+  if (create_memento) {
+    __ CallRuntime(Runtime::kNewObjectWithAllocationSite, 3);
+  } else {
+    __ CallRuntime(Runtime::kNewObject, 2);
+  }
+  __ mov(ebx, eax);  // store result in ebx
+
+  // Runtime_NewObjectWithAllocationSite increments allocation count.
+  // Skip the increment.
+  if (create_memento) {
+    __ jmp(count_incremented);
+  } else {
+    __ jmp(allocated);
+  }
+}
+
+
 static void Generate_JSConstructStubHelper(MacroAssembler* masm,
                                            bool is_api_function,
                                            bool create_memento) {
@@ -107,6 +143,7 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
   //  -- eax: number of arguments
   //  -- edi: constructor function
   //  -- ebx: allocation site or undefined
+  //  -- edx: original constructor
   // -----------------------------------
 
   // Should never create mementos for api functions.
@@ -128,9 +165,20 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     // Push the function to invoke on the stack.
     __ push(edi);
 
+    __ cmp(edx, edi);
+    Label normal_new;
+    Label count_incremented;
+    Label allocated;
+    __ j(equal, &normal_new);
+
+    // Original constructor and function are different.
+    Generate_Runtime_NewObject(masm, create_memento, edx, &count_incremented,
+                               &allocated);
+    __ bind(&normal_new);
+
     // Try to allocate the object without transitioning into C code. If any of
     // the preconditions is not met, the code bails out to the runtime call.
-    Label rt_call, allocated;
+    Label rt_call;
     if (FLAG_inline_new) {
       Label undo_allocation;
       ExternalReference debug_step_in_fp =
@@ -344,34 +392,8 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
 
     // Allocate the new receiver object using the runtime call.
     __ bind(&rt_call);
-    int offset = 0;
-    if (create_memento) {
-      // Get the cell or allocation site.
-      __ mov(edi, Operand(esp, kPointerSize * 2));
-      __ push(edi);
-      offset = kPointerSize;
-    }
-
-    // Must restore esi (context) and edi (constructor) before calling runtime.
-    __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
-    __ mov(edi, Operand(esp, offset));
-    // edi: function (constructor)
-    __ push(edi);
-    if (create_memento) {
-      __ CallRuntime(Runtime::kNewObjectWithAllocationSite, 2);
-    } else {
-      __ CallRuntime(Runtime::kNewObject, 1);
-    }
-    __ mov(ebx, eax);  // store result in ebx
-
-    // If we ended up using the runtime, and we want a memento, then the
-    // runtime call made it for us, and we shouldn't do create count
-    // increment.
-    Label count_incremented;
-    if (create_memento) {
-      __ jmp(&count_incremented);
-    }
-
+    Generate_Runtime_NewObject(masm, create_memento, edi, &count_incremented,
+                               &allocated);
     // New object allocated.
     // ebx: newly allocated object
     __ bind(&allocated);
diff --git a/src/x87/code-stubs-x87.cc b/src/x87/code-stubs-x87.cc
index f0901b32b7..a8b3e62235 100644
--- a/src/x87/code-stubs-x87.cc
+++ b/src/x87/code-stubs-x87.cc
@@ -1836,6 +1836,9 @@ void CallConstructStub::Generate(MacroAssembler* masm) {
     __ AssertUndefinedOrAllocationSite(ebx);
   }
 
+  // Pass original constructor to construct stub.
+  __ mov(edx, edi);
+
   // Jump to the function-specific construct stub.
   Register jmp_reg = ecx;
   __ mov(jmp_reg, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
diff --git a/src/x87/full-codegen-x87.cc b/src/x87/full-codegen-x87.cc
index 7cd503e58c..4a3e5cc376 100644
--- a/src/x87/full-codegen-x87.cc
+++ b/src/x87/full-codegen-x87.cc
@@ -2991,7 +2991,6 @@ void FullCodeGenerator::VisitCall(Call* expr) {
 
   } else if (call_type == Call::GLOBAL_CALL) {
     EmitCallWithLoadIC(expr);
-
   } else if (call_type == Call::LOOKUP_SLOT_CALL) {
     // Call to a lookup slot (dynamically introduced variable).
     VariableProxy* proxy = callee->AsVariableProxy();
@@ -3050,11 +3049,15 @@ void FullCodeGenerator::VisitCall(Call* expr) {
       }
     }
   } else if (call_type == Call::SUPER_CALL) {
-    SuperReference* super_ref = callee->AsSuperReference();
-    EmitLoadSuperConstructor(super_ref);
-    __ push(result_register());
-    VisitForStackValue(super_ref->this_var());
-    EmitCall(expr, CallICState::METHOD);
+    if (FLAG_experimental_classes) {
+      EmitSuperConstructorCall(expr);
+    } else {
+      SuperReference* super_ref = callee->AsSuperReference();
+      EmitLoadSuperConstructor(super_ref);
+      __ push(result_register());
+      VisitForStackValue(super_ref->this_var());
+      EmitCall(expr, CallICState::METHOD);
+    }
   } else {
     DCHECK(call_type == Call::OTHER_CALL);
     // Call to an arbitrary expression not handled specially above.
@@ -3121,6 +3124,51 @@ void FullCodeGenerator::VisitCallNew(CallNew* expr) {
 }
 
 
+void FullCodeGenerator::EmitSuperConstructorCall(Call* expr) {
+  SuperReference* super_ref = expr->expression()->AsSuperReference();
+  EmitLoadSuperConstructor(super_ref);
+  __ push(result_register());
+
+  // Push the arguments ("left-to-right") on the stack.
+  ZoneList<Expression*>* args = expr->arguments();
+  int arg_count = args->length();
+  for (int i = 0; i < arg_count; i++) {
+    VisitForStackValue(args->at(i));
+  }
+
+  // Call the construct call builtin that handles allocation and
+  // constructor invocation.
+  SetSourcePosition(expr->position());
+
+  // Load function and argument count into edi and eax.
+  __ Move(eax, Immediate(arg_count));
+  __ mov(edi, Operand(esp, arg_count * kPointerSize));
+
+  // Record call targets in unoptimized code.
+  if (FLAG_pretenuring_call_new) {
+    UNREACHABLE();
+    /* TODO(dslomov): support pretenuring.
+    EnsureSlotContainsAllocationSite(expr->AllocationSiteFeedbackSlot());
+    DCHECK(expr->AllocationSiteFeedbackSlot().ToInt() ==
+           expr->CallNewFeedbackSlot().ToInt() + 1);
+    */
+  }
+
+  __ LoadHeapObject(ebx, FeedbackVector());
+  __ mov(edx, Immediate(SmiFromSlot(expr->CallFeedbackSlot())));
+
+  // TODO(dslomov): use a different stub and propagate new.target.
+  CallConstructStub stub(isolate(), RECORD_CONSTRUCTOR_TARGET);
+  __ call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
+
+  RecordJSReturnSite(expr);
+
+  // TODO(dslomov): implement TDZ for `this`.
+  EmitVariableAssignment(super_ref->this_var()->var(), Token::ASSIGN);
+  context()->Plug(eax);
+}
+
+
 void FullCodeGenerator::EmitIsSmi(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 1);