diff --git a/src/mips64/interface-descriptors-mips64.cc b/src/mips64/interface-descriptors-mips64.cc
index 73df66e..7695d0b 100644
--- a/src/mips64/interface-descriptors-mips64.cc
+++ b/src/mips64/interface-descriptors-mips64.cc
@@ -109,35 +109,8 @@
 }
 
 
-void ToNumberDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {a0};
-  data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
-}
-
-
 // static
-const Register ToLengthDescriptor::ReceiverRegister() { return a0; }
-
-
-// static
-const Register ToStringDescriptor::ReceiverRegister() { return a0; }
-
-
-// static
-const Register ToNameDescriptor::ReceiverRegister() { return a0; }
-
-
-// static
-const Register ToObjectDescriptor::ReceiverRegister() { return a0; }
-
-
-void NumberToStringDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {a0};
-  data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
-}
-
+const Register TypeConversionDescriptor::ArgumentRegister() { return a0; }
 
 void TypeofDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
@@ -266,6 +239,13 @@
   data->InitializePlatformSpecific(0, nullptr, nullptr);
 }
 
+#define SIMD128_ALLOC_DESC(TYPE, Type, type, lane_count, lane_type) \
+  void Allocate##Type##Descriptor::InitializePlatformSpecific(      \
+      CallInterfaceDescriptorData* data) {                          \
+    data->InitializePlatformSpecific(0, nullptr, nullptr);          \
+  }
+SIMD128_TYPES(SIMD128_ALLOC_DESC)
+#undef SIMD128_ALLOC_DESC
 
 void AllocateInNewSpaceDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
@@ -310,7 +290,12 @@
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
-
+void FastArrayPushDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  // stack param count needs (arg count)
+  Register registers[] = {a0};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
 void CompareDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {a1, a0};
@@ -318,20 +303,6 @@
 }
 
 
-void CompareNilDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {a0};
-  data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
-}
-
-
-void ToBooleanDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {a0};
-  data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
-}
-
-
 void BinaryOpDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {a1, a0};
@@ -391,21 +362,7 @@
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
-
-void ApiFunctionDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {
-      a0,  // callee
-      a4,  // call_data
-      a2,  // holder
-      a1,  // api_function_address
-      a3,  // actual number of arguments
-  };
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
-
-void ApiAccessorDescriptor::InitializePlatformSpecific(
+void ApiCallbackDescriptorBase::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {
       a0,  // callee