diff --git a/ChangeLog b/ChangeLog
index 25aa723..114fefd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2015-01-19: Version 4.2.14
+
+        Performance and stability improvements on all platforms.
+
+
 2015-01-18: Version 4.2.13
 
         Performance and stability improvements on all platforms.
diff --git a/src/ic/x87/handler-compiler-x87.cc b/src/ic/x87/handler-compiler-x87.cc
index f3c8744..0540faf 100644
--- a/src/ic/x87/handler-compiler-x87.cc
+++ b/src/ic/x87/handler-compiler-x87.cc
@@ -137,20 +137,19 @@
 // This function uses push() to generate smaller, faster code than
 // the version above. It is an optimization that should will be removed
 // when api call ICs are generated in hydrogen.
-void PropertyHandlerCompiler::GenerateFastApiCall(
+void PropertyHandlerCompiler::GenerateApiAccessorCall(
     MacroAssembler* masm, const CallOptimization& optimization,
     Handle<Map> receiver_map, Register receiver, Register scratch_in,
-    bool is_store, int argc, Register* values) {
+    bool is_store, Register store_parameter) {
   // Copy return value.
   __ pop(scratch_in);
   // receiver
   __ push(receiver);
   // Write the arguments to stack frame.
-  for (int i = 0; i < argc; i++) {
-    Register arg = values[argc - 1 - i];
-    DCHECK(!receiver.is(arg));
-    DCHECK(!scratch_in.is(arg));
-    __ push(arg);
+  if (is_store) {
+    DCHECK(!receiver.is(store_parameter));
+    DCHECK(!scratch_in.is(store_parameter));
+    __ push(store_parameter);
   }
   __ push(scratch_in);
   // Stack now matches JSFunction abi.
@@ -204,7 +203,7 @@
   __ mov(api_function_address, Immediate(function_address));
 
   // Jump to stub.
-  CallApiFunctionStub stub(isolate, is_store, call_data_undefined, argc);
+  CallApiAccessorStub stub(isolate, is_store, call_data_undefined);
   __ TailCallStub(&stub);
 }
 
diff --git a/src/version.cc b/src/version.cc
index fbf97b6..756e38e 100644
--- a/src/version.cc
+++ b/src/version.cc
@@ -34,7 +34,7 @@
 // system so their names cannot be changed without changing the scripts.
 #define MAJOR_VERSION     4
 #define MINOR_VERSION     2
-#define BUILD_NUMBER      13
+#define BUILD_NUMBER      14
 #define PATCH_LEVEL       0
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)
diff --git a/src/x87/code-stubs-x87.cc b/src/x87/code-stubs-x87.cc
index 1264dd9..fd97a14 100644
--- a/src/x87/code-stubs-x87.cc
+++ b/src/x87/code-stubs-x87.cc
@@ -4341,13 +4341,17 @@
 }
 
 
-void CallApiFunctionStub::Generate(MacroAssembler* masm) {
+static void CallApiFunctionStubHelper(MacroAssembler* masm,
+                                      const ParameterCount& argc,
+                                      bool return_first_arg,
+                                      bool call_data_undefined) {
   // ----------- S t a t e -------------
   //  -- eax                 : callee
   //  -- ebx                 : call_data
   //  -- ecx                 : holder
   //  -- edx                 : api_function_address
   //  -- esi                 : context
+  //  -- edi                 : number of arguments if argc is a register
   //  --
   //  -- esp[0]              : return address
   //  -- esp[4]              : last argument
@@ -4360,13 +4364,8 @@
   Register call_data = ebx;
   Register holder = ecx;
   Register api_function_address = edx;
-  Register return_address = edi;
   Register context = esi;
 
-  int argc = this->argc();
-  bool is_store = this->is_store();
-  bool call_data_undefined = this->call_data_undefined();
-
   typedef FunctionCallbackArguments FCA;
 
   STATIC_ASSERT(FCA::kContextSaveIndex == 6);
@@ -4378,12 +4377,10 @@
   STATIC_ASSERT(FCA::kHolderIndex == 0);
   STATIC_ASSERT(FCA::kArgsLength == 7);
 
-  __ pop(return_address);
+  DCHECK(argc.is_immediate() || edi.is(argc.reg()));
 
-  // context save
-  __ push(context);
-  // load context from callee
-  __ mov(context, FieldOperand(callee, JSFunction::kContextOffset));
+  // pop return address and save context
+  __ xchg(context, Operand(esp, 0));
 
   // callee
   __ push(callee);
@@ -4394,9 +4391,9 @@
   Register scratch = call_data;
   if (!call_data_undefined) {
     // return value
-    __ push(Immediate(isolate()->factory()->undefined_value()));
+    __ push(Immediate(masm->isolate()->factory()->undefined_value()));
     // return value default
-    __ push(Immediate(isolate()->factory()->undefined_value()));
+    __ push(Immediate(masm->isolate()->factory()->undefined_value()));
   } else {
     // return value
     __ push(scratch);
@@ -4404,14 +4401,17 @@
     __ push(scratch);
   }
   // isolate
-  __ push(Immediate(reinterpret_cast<int>(isolate())));
+  __ push(Immediate(reinterpret_cast<int>(masm->isolate())));
   // holder
   __ push(holder);
 
   __ mov(scratch, esp);
 
-  // return address
-  __ push(return_address);
+  // push return address
+  __ push(context);
+
+  // load context from callee
+  __ mov(context, FieldOperand(callee, JSFunction::kContextOffset));
 
   // API function gets reference to the v8::Arguments. If CPU profiler
   // is enabled wrapper function will be called and we need to pass
@@ -4427,37 +4427,72 @@
 
   // FunctionCallbackInfo::implicit_args_.
   __ mov(ApiParameterOperand(2), scratch);
-  __ add(scratch, Immediate((argc + FCA::kArgsLength - 1) * kPointerSize));
-  // FunctionCallbackInfo::values_.
-  __ mov(ApiParameterOperand(3), scratch);
-  // FunctionCallbackInfo::length_.
-  __ Move(ApiParameterOperand(4), Immediate(argc));
-  // FunctionCallbackInfo::is_construct_call_.
-  __ Move(ApiParameterOperand(5), Immediate(0));
+  if (argc.is_immediate()) {
+    __ add(scratch,
+           Immediate((argc.immediate() + FCA::kArgsLength - 1) * kPointerSize));
+    // FunctionCallbackInfo::values_.
+    __ mov(ApiParameterOperand(3), scratch);
+    // FunctionCallbackInfo::length_.
+    __ Move(ApiParameterOperand(4), Immediate(argc.immediate()));
+    // FunctionCallbackInfo::is_construct_call_.
+    __ Move(ApiParameterOperand(5), Immediate(0));
+  } else {
+    __ lea(scratch, Operand(scratch, argc.reg(), times_pointer_size,
+                            (FCA::kArgsLength - 1) * kPointerSize));
+    // FunctionCallbackInfo::values_.
+    __ mov(ApiParameterOperand(3), scratch);
+    // FunctionCallbackInfo::length_.
+    __ mov(ApiParameterOperand(4), argc.reg());
+    // FunctionCallbackInfo::is_construct_call_.
+    __ lea(argc.reg(), Operand(argc.reg(), times_pointer_size,
+                               (FCA::kArgsLength + 1) * kPointerSize));
+    __ mov(ApiParameterOperand(5), argc.reg());
+  }
 
   // v8::InvocationCallback's argument.
   __ lea(scratch, ApiParameterOperand(2));
   __ mov(ApiParameterOperand(0), scratch);
 
   ExternalReference thunk_ref =
-      ExternalReference::invoke_function_callback(isolate());
+      ExternalReference::invoke_function_callback(masm->isolate());
 
   Operand context_restore_operand(ebp,
                                   (2 + FCA::kContextSaveIndex) * kPointerSize);
   // Stores return the first js argument
   int return_value_offset = 0;
-  if (is_store) {
+  if (return_first_arg) {
     return_value_offset = 2 + FCA::kArgsLength;
   } else {
     return_value_offset = 2 + FCA::kReturnValueOffset;
   }
   Operand return_value_operand(ebp, return_value_offset * kPointerSize);
-  __ CallApiFunctionAndReturn(api_function_address,
-                              thunk_ref,
-                              ApiParameterOperand(1),
-                              argc + FCA::kArgsLength + 1,
-                              return_value_operand,
-                              &context_restore_operand);
+  int stack_space = 0;
+  Operand is_construct_call_operand = ApiParameterOperand(5);
+  Operand* stack_space_operand = &is_construct_call_operand;
+  if (argc.is_immediate()) {
+    stack_space = argc.immediate() + FCA::kArgsLength + 1;
+    stack_space_operand = nullptr;
+  }
+  __ CallApiFunctionAndReturn(
+      api_function_address, thunk_ref, ApiParameterOperand(1), stack_space,
+      stack_space_operand, return_value_operand, &context_restore_operand);
+}
+
+
+void CallApiFunctionStub::Generate(MacroAssembler* masm) {
+  // TODO(dcarney): make eax contain the function address.
+  bool call_data_undefined = this->call_data_undefined();
+  CallApiFunctionStubHelper(masm, ParameterCount(edi), false,
+                            call_data_undefined);
+}
+
+
+void CallApiAccessorStub::Generate(MacroAssembler* masm) {
+  bool is_store = this->is_store();
+  int argc = is_store ? 1 : 0;
+  bool call_data_undefined = this->call_data_undefined();
+  CallApiFunctionStubHelper(masm, ParameterCount(argc), is_store,
+                            call_data_undefined);
 }
 
 
@@ -4492,12 +4527,9 @@
   ExternalReference thunk_ref =
       ExternalReference::invoke_accessor_getter_callback(isolate());
 
-  __ CallApiFunctionAndReturn(api_function_address,
-                              thunk_ref,
-                              ApiParameterOperand(2),
-                              kStackSpace,
-                              Operand(ebp, 7 * kPointerSize),
-                              NULL);
+  __ CallApiFunctionAndReturn(api_function_address, thunk_ref,
+                              ApiParameterOperand(2), kStackSpace, nullptr,
+                              Operand(ebp, 7 * kPointerSize), NULL);
 }
 
 
diff --git a/src/x87/interface-descriptors-x87.cc b/src/x87/interface-descriptors-x87.cc
index 26ce4dc..b2c4b6b 100644
--- a/src/x87/interface-descriptors-x87.cc
+++ b/src/x87/interface-descriptors-x87.cc
@@ -300,6 +300,27 @@
       ebx,  // call_data
       ecx,  // holder
       edx,  // api_function_address
+      edi,  // actual number of arguments
+  };
+  Representation representations[] = {
+      Representation::Tagged(),     // context
+      Representation::Tagged(),     // callee
+      Representation::Tagged(),     // call_data
+      Representation::Tagged(),     // holder
+      Representation::External(),   // api_function_address
+      Representation::Integer32(),  // actual number of arguments
+  };
+  data->Initialize(arraysize(registers), registers, representations);
+}
+
+
+void ApiAccessorDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {
+      esi,  // context
+      eax,  // callee
+      ebx,  // call_data
+      ecx,  // holder
+      edx,  // api_function_address
   };
   Representation representations[] = {
       Representation::Tagged(),    // context
diff --git a/src/x87/macro-assembler-x87.cc b/src/x87/macro-assembler-x87.cc
index 96a0590..2cf6afd 100644
--- a/src/x87/macro-assembler-x87.cc
+++ b/src/x87/macro-assembler-x87.cc
@@ -2062,12 +2062,9 @@
 
 
 void MacroAssembler::CallApiFunctionAndReturn(
-    Register function_address,
-    ExternalReference thunk_ref,
-    Operand thunk_last_arg,
-    int stack_space,
-    Operand return_value_operand,
-    Operand* context_restore_operand) {
+    Register function_address, ExternalReference thunk_ref,
+    Operand thunk_last_arg, int stack_space, Operand* stack_space_operand,
+    Operand return_value_operand, Operand* context_restore_operand) {
   ExternalReference next_address =
       ExternalReference::handle_scope_next_address(isolate());
   ExternalReference limit_address =
@@ -2186,8 +2183,18 @@
   if (restore_context) {
     mov(esi, *context_restore_operand);
   }
+  if (stack_space_operand != nullptr) {
+    mov(ebx, *stack_space_operand);
+  }
   LeaveApiExitFrame(!restore_context);
-  ret(stack_space * kPointerSize);
+  if (stack_space_operand != nullptr) {
+    DCHECK_EQ(0, stack_space);
+    pop(ecx);
+    add(esp, ebx);
+    jmp(ecx);
+  } else {
+    ret(stack_space * kPointerSize);
+  }
 
   bind(&promote_scheduled_exception);
   {
diff --git a/src/x87/macro-assembler-x87.h b/src/x87/macro-assembler-x87.h
index b797265..4a2f832 100644
--- a/src/x87/macro-assembler-x87.h
+++ b/src/x87/macro-assembler-x87.h
@@ -768,8 +768,8 @@
   // stack_space * kPointerSize (GCed).
   void CallApiFunctionAndReturn(Register function_address,
                                 ExternalReference thunk_ref,
-                                Operand thunk_last_arg,
-                                int stack_space,
+                                Operand thunk_last_arg, int stack_space,
+                                Operand* stack_space_operand,
                                 Operand return_value_operand,
                                 Operand* context_restore_operand);