diff --git a/src/ia32/interface-descriptors-ia32.cc b/src/ia32/interface-descriptors-ia32.cc
index 8a877b1..98259c7 100644
--- a/src/ia32/interface-descriptors-ia32.cc
+++ b/src/ia32/interface-descriptors-ia32.cc
@@ -11,6 +11,14 @@
 
 const Register CallInterfaceDescriptor::ContextRegister() { return esi; }
 
+void CallInterfaceDescriptor::DefaultInitializePlatformSpecific(
+    CallInterfaceDescriptorData* data, int register_parameter_count) {
+  const Register default_stub_registers[] = {eax, ebx, ecx, edx, edi};
+  CHECK_LE(static_cast<size_t>(register_parameter_count),
+           arraysize(default_stub_registers));
+  data->InitializePlatformSpecific(register_parameter_count,
+                                   default_stub_registers);
+}
 
 const Register LoadDescriptor::ReceiverRegister() { return edx; }
 const Register LoadDescriptor::NameRegister() { return ecx; }
@@ -44,9 +52,6 @@
 const Register StoreTransitionDescriptor::MapRegister() { return ebx; }
 
 
-const Register LoadGlobalViaContextDescriptor::SlotRegister() { return ebx; }
-
-
 const Register StoreGlobalViaContextDescriptor::SlotRegister() { return ebx; }
 const Register StoreGlobalViaContextDescriptor::ValueRegister() { return eax; }
 
@@ -68,8 +73,6 @@
 const Register GrowArrayElementsDescriptor::ObjectRegister() { return eax; }
 const Register GrowArrayElementsDescriptor::KeyRegister() { return ebx; }
 
-const Register HasPropertyDescriptor::ObjectRegister() { return eax; }
-const Register HasPropertyDescriptor::KeyRegister() { return ebx; }
 
 void FastNewClosureDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
@@ -259,43 +262,27 @@
   data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
 }
 
-void ArrayConstructorConstantArgCountDescriptor::InitializePlatformSpecific(
+void ArraySingleArgumentConstructorDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // register state
   // eax -- number of arguments
   // edi -- function
   // ebx -- allocation site with elements kind
-  Register registers[] = {edi, ebx};
+  Register registers[] = {edi, ebx, eax};
   data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
 }
 
-
-void ArrayConstructorDescriptor::InitializePlatformSpecific(
+void ArrayNArgumentsConstructorDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
-  // stack param count needs (constructor pointer, and single argument)
-  Register registers[] = {edi, ebx, eax};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
-
-void InternalArrayConstructorConstantArgCountDescriptor::
-    InitializePlatformSpecific(CallInterfaceDescriptorData* data) {
   // register state
   // eax -- number of arguments
   // edi -- function
-  Register registers[] = {edi};
+  // ebx -- allocation site with elements kind
+  Register registers[] = {edi, ebx, eax};
   data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
 }
 
-
-void InternalArrayConstructorDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  // stack param count needs (constructor pointer, and single argument)
-  Register registers[] = {edi, eax};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
-void FastArrayPushDescriptor::InitializePlatformSpecific(
+void VarArgFunctionDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // stack param count needs (arg count)
   Register registers[] = {eax};