X64: Enable specialized stubs for length property.

src/x64/ic-x64.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 588 matching lines @@
   __ push(rax);  // receiver
   __ push(rcx);  // name
   __ push(rbx);  // return address
 
   // Perform tail call to the entry.
   __ TailCallRuntime(f, 2);
 }
 
 
 void LoadIC::GenerateArrayLength(MacroAssembler* masm) {
-  Generate(masm, ExternalReference(IC_Utility(kLoadIC_Miss)));
+  // ----------- S t a t e -------------
+  //  -- rcx    : name
+  //  -- rsp[0] : return address
+  //  -- rsp[8] : receiver
+  // -----------------------------------
+
+  Label miss;
+
+  __ movq(rax, Operand(rsp, kPointerSize));
+
+  StubCompiler::GenerateLoadArrayLength(masm, rax, rdx, &miss);
+  __ bind(&miss);
+  StubCompiler::GenerateLoadMiss(masm, Code::LOAD_IC);
 }
 
+
 void LoadIC::GenerateFunctionPrototype(MacroAssembler* masm) {
   Generate(masm, ExternalReference(IC_Utility(kLoadIC_Miss)));
 }
 
 
 void LoadIC::GenerateMegamorphic(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- rcx    : name
   //  -- rsp[0] : return address
   //  -- rsp[8] : receiver
@@ skipping 21 matching lines @@
 
   Generate(masm, ExternalReference(IC_Utility(kLoadIC_Miss)));
 }
 
 void LoadIC::GenerateNormal(MacroAssembler* masm) {
   Generate(masm, ExternalReference(IC_Utility(kLoadIC_Miss)));
 }
 
 
 void LoadIC::GenerateStringLength(MacroAssembler* masm) {
-  Generate(masm, ExternalReference(IC_Utility(kLoadIC_Miss)));
+  // ----------- S t a t e -------------
+  //  -- rcx    : name
+  //  -- rsp[0] : return address
+  //  -- rsp[8] : receiver
+  // -----------------------------------
+
+  Label miss;
+
+  __ movq(rax, Operand(rsp, kPointerSize));
+
+  StubCompiler::GenerateLoadStringLength(masm, rax, rdx, &miss);
+  __ bind(&miss);
+  StubCompiler::GenerateLoadMiss(masm, Code::LOAD_IC);
 }
 
 
+
 bool LoadIC::PatchInlinedLoad(Address address, Object* map, int offset) {
   // The address of the instruction following the call.
   Address test_instruction_address =
       address + Assembler::kTargetAddrToReturnAddrDist;
   // If the instruction following the call is not a test eax, nothing
   // was inlined.
   if (*test_instruction_address != kTestEaxByte) return false;
 
   Address delta_address = test_instruction_address + 1;
   // The delta to the start of the map check instruction.
@@ skipping 52 matching lines @@
 
 void StoreIC::GenerateMegamorphic(MacroAssembler* masm) {
   Generate(masm, ExternalReference(IC_Utility(kStoreIC_Miss)));
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal