diff --git a/src/ia32/interface-descriptors-ia32.cc b/src/ia32/interface-descriptors-ia32.cc
new file mode 100644
index 0000000..3a0d526
--- /dev/null
+++ b/src/ia32/interface-descriptors-ia32.cc
@@ -0,0 +1,304 @@
+// Copyright 2012 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/v8.h"
+
+#if V8_TARGET_ARCH_IA32
+
+#include "src/interface-descriptors.h"
+
+namespace v8 {
+namespace internal {
+
+const Register CallInterfaceDescriptor::ContextRegister() { return esi; }
+
+
+const Register LoadDescriptor::ReceiverRegister() { return edx; }
+const Register LoadDescriptor::NameRegister() { return ecx; }
+
+
+const Register VectorLoadICTrampolineDescriptor::SlotRegister() { return eax; }
+
+
+const Register VectorLoadICDescriptor::VectorRegister() { return ebx; }
+
+
+const Register StoreDescriptor::ReceiverRegister() { return edx; }
+const Register StoreDescriptor::NameRegister() { return ecx; }
+const Register StoreDescriptor::ValueRegister() { return eax; }
+
+
+const Register ElementTransitionAndStoreDescriptor::MapRegister() {
+  return ebx;
+}
+
+
+const Register InstanceofDescriptor::left() { return eax; }
+const Register InstanceofDescriptor::right() { return edx; }
+
+
+const Register ArgumentsAccessReadDescriptor::index() { return edx; }
+const Register ArgumentsAccessReadDescriptor::parameter_count() { return eax; }
+
+
+const Register ApiGetterDescriptor::function_address() { return edx; }
+
+
+const Register MathPowTaggedDescriptor::exponent() { return eax; }
+
+
+const Register MathPowIntegerDescriptor::exponent() {
+  return MathPowTaggedDescriptor::exponent();
+}
+
+
+void FastNewClosureDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, ebx};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void FastNewContextDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, edi};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void ToNumberDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  // ToNumberStub invokes a function, and therefore needs a context.
+  Register registers[] = {esi, eax};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void NumberToStringDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, eax};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void FastCloneShallowArrayDescriptor::Initialize(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, eax, ebx, ecx};
+  Representation representations[] = {
+      Representation::Tagged(), Representation::Tagged(), Representation::Smi(),
+      Representation::Tagged()};
+  data->Initialize(arraysize(registers), registers, representations);
+}
+
+
+void FastCloneShallowObjectDescriptor::Initialize(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, eax, ebx, ecx, edx};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void CreateAllocationSiteDescriptor::Initialize(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, ebx, edx};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void StoreArrayLiteralElementDescriptor::Initialize(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, ecx, eax};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void CallFunctionDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, edi};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void CallFunctionWithFeedbackDescriptor::Initialize(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, edi, edx};
+  Representation representations[] = {Representation::Tagged(),
+                                      Representation::Tagged(),
+                                      Representation::Smi()};
+  data->Initialize(arraysize(registers), registers, representations);
+}
+
+
+void CallConstructDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  // eax : number of arguments
+  // ebx : feedback vector
+  // edx : (only if ebx is not the megamorphic symbol) slot in feedback
+  //       vector (Smi)
+  // edi : constructor function
+  // TODO(turbofan): So far we don't gather type feedback and hence skip the
+  // slot parameter, but ArrayConstructStub needs the vector to be undefined.
+  Register registers[] = {esi, eax, edi, ebx};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void RegExpConstructResultDescriptor::Initialize(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, ecx, ebx, eax};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void TransitionElementsKindDescriptor::Initialize(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, eax, ebx};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void ArrayConstructorConstantArgCountDescriptor::Initialize(
+    CallInterfaceDescriptorData* data) {
+  // register state
+  // eax -- number of arguments
+  // edi -- function
+  // ebx -- allocation site with elements kind
+  Register registers[] = {esi, edi, ebx};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void ArrayConstructorDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  // stack param count needs (constructor pointer, and single argument)
+  Register registers[] = {esi, edi, ebx, eax};
+  Representation representations[] = {
+      Representation::Tagged(), Representation::Tagged(),
+      Representation::Tagged(), Representation::Integer32()};
+  data->Initialize(arraysize(registers), registers, representations);
+}
+
+
+void InternalArrayConstructorConstantArgCountDescriptor::Initialize(
+    CallInterfaceDescriptorData* data) {
+  // register state
+  // eax -- number of arguments
+  // edi -- function
+  Register registers[] = {esi, edi};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void InternalArrayConstructorDescriptor::Initialize(
+    CallInterfaceDescriptorData* data) {
+  // stack param count needs (constructor pointer, and single argument)
+  Register registers[] = {esi, edi, eax};
+  Representation representations[] = {Representation::Tagged(),
+                                      Representation::Tagged(),
+                                      Representation::Integer32()};
+  data->Initialize(arraysize(registers), registers, representations);
+}
+
+
+void CompareNilDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, eax};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void ToBooleanDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, eax};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void BinaryOpDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, edx, eax};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void BinaryOpWithAllocationSiteDescriptor::Initialize(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, ecx, edx, eax};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void StringAddDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, edx, eax};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
+void KeyedDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {
+      esi,  // context
+      ecx,  // key
+  };
+  Representation representations[] = {
+      Representation::Tagged(),  // context
+      Representation::Tagged(),  // key
+  };
+  data->Initialize(arraysize(registers), registers, representations);
+}
+
+
+void NamedDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {
+      esi,  // context
+      ecx,  // name
+  };
+  Representation representations[] = {
+      Representation::Tagged(),  // context
+      Representation::Tagged(),  // name
+  };
+  data->Initialize(arraysize(registers), registers, representations);
+}
+
+
+void CallHandlerDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {
+      esi,  // context
+      edx,  // name
+  };
+  Representation representations[] = {
+      Representation::Tagged(),  // context
+      Representation::Tagged(),  // receiver
+  };
+  data->Initialize(arraysize(registers), registers, representations);
+}
+
+
+void ArgumentAdaptorDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {
+      esi,  // context
+      edi,  // JSFunction
+      eax,  // actual number of arguments
+      ebx,  // expected number of arguments
+  };
+  Representation representations[] = {
+      Representation::Tagged(),     // context
+      Representation::Tagged(),     // JSFunction
+      Representation::Integer32(),  // actual number of arguments
+      Representation::Integer32(),  // expected number of arguments
+  };
+  data->Initialize(arraysize(registers), registers, representations);
+}
+
+
+void ApiFunctionDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {
+      esi,  // context
+      eax,  // callee
+      ebx,  // call_data
+      ecx,  // holder
+      edx,  // api_function_address
+  };
+  Representation representations[] = {
+      Representation::Tagged(),    // context
+      Representation::Tagged(),    // callee
+      Representation::Tagged(),    // call_data
+      Representation::Tagged(),    // holder
+      Representation::External(),  // api_function_address
+  };
+  data->Initialize(arraysize(registers), registers, representations);
+}
+}
+}  // namespace v8::internal
+
+#endif  // V8_TARGET_ARCH_IA32