diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index ad5396ec62..e39c340784 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1107,12 +1107,6 @@ bool Genesis::InstallNatives() {
     global_context()->set_empty_script(*script);
   }
 
-#ifdef V8_HOST_ARCH_64_BIT
-  // TODO(X64): Remove this when inline caches work.
-  FLAG_use_ic = false;
-#endif  // V8_HOST_ARCH_64_BIT
-
-
   if (FLAG_natives_file == NULL) {
     // Without natives file, install default natives.
     for (int i = Natives::GetDelayCount();
diff --git a/src/ia32/ic-ia32.cc b/src/ia32/ic-ia32.cc
index 90e0fd1b40..5ffe13d3fb 100644
--- a/src/ia32/ic-ia32.cc
+++ b/src/ia32/ic-ia32.cc
@@ -153,6 +153,9 @@ static void GenerateCheckNonObjectOrLoaded(MacroAssembler* masm, Label* miss,
 }
 
 
+// The offset from the inlined patch site to the start of the
+// inlined load instruction.  It is 7 bytes (test eax, imm) plus
+// 6 bytes (jne slow_label).
 const int LoadIC::kOffsetToLoadInstruction = 13;
 
 
diff --git a/src/ic.cc b/src/ic.cc
index b0ed4d7edd..7647961998 100644
--- a/src/ic.cc
+++ b/src/ic.cc
@@ -365,10 +365,13 @@ Object* CallIC::LoadFunction(State state,
     return TypeError("undefined_method", object, name);
   }
 
+  // TODO(X64): Enable inline cache for calls.
+#ifndef V8_TARGET_ARCH_X64
   // Lookup is valid: Update inline cache and stub cache.
   if (FLAG_use_ic && lookup.IsLoaded()) {
     UpdateCaches(&lookup, state, object, name);
   }
+#endif
 
   // Get the property.
   PropertyAttributes attr;
@@ -609,10 +612,13 @@ Object* LoadIC::Load(State state, Handle<Object> object, Handle<String> name) {
     }
   }
 
+  // TODO(X64): Enable inline cache for load.
+  #ifndef V8_TARGET_ARCH_X64
   // Update inline cache and stub cache.
   if (FLAG_use_ic && lookup.IsLoaded()) {
     UpdateCaches(&lookup, state, object, name);
   }
+  #endif
 
   PropertyAttributes attr;
   if (lookup.IsValid() && lookup.type() == INTERCEPTOR) {
@@ -737,7 +743,9 @@ Object* KeyedLoadIC::Load(State state,
       return TypeError("non_object_property_load", object, name);
     }
 
-    if (FLAG_use_ic) {
+    // TODO(X64): Enable specialized stubs for length and prototype lookup.
+#ifndef V8_TARGET_ARCH_X64
+    if (false && FLAG_use_ic) {
       // Use specialized code for getting the length of strings.
       if (object->IsString() && name->Equals(Heap::length_symbol())) {
         Handle<String> string = Handle<String>::cast(object);
@@ -747,7 +755,7 @@ Object* KeyedLoadIC::Load(State state,
         set_target(Code::cast(code));
 #ifdef DEBUG
         TraceIC("KeyedLoadIC", name, state, target());
-#endif
+#endif  // DEBUG
         return Smi::FromInt(string->length());
       }
 
@@ -759,7 +767,7 @@ Object* KeyedLoadIC::Load(State state,
         set_target(Code::cast(code));
 #ifdef DEBUG
         TraceIC("KeyedLoadIC", name, state, target());
-#endif
+#endif  // DEBUG
         return JSArray::cast(*object)->length();
       }
 
@@ -772,10 +780,11 @@ Object* KeyedLoadIC::Load(State state,
         set_target(Code::cast(code));
 #ifdef DEBUG
         TraceIC("KeyedLoadIC", name, state, target());
-#endif
+#endif  // DEBUG
         return Accessors::FunctionGetPrototype(*object, 0);
       }
     }
+#endif  // !V8_TARGET_ARCH_X64
 
     // Check if the name is trivially convertible to an index and get
     // the element or char if so.
@@ -798,10 +807,13 @@ Object* KeyedLoadIC::Load(State state,
       }
     }
 
+    // TODO(X64): Enable inline caching for load.
+#ifndef V8_TARGET_ARCH_X64
     // Update the inline cache.
     if (FLAG_use_ic && lookup.IsLoaded()) {
       UpdateCaches(&lookup, state, object, name);
     }
+#endif
 
     PropertyAttributes attr;
     if (lookup.IsValid() && lookup.type() == INTERCEPTOR) {
@@ -972,6 +984,10 @@ Object* StoreIC::Store(State state,
     return *value;
   }
 
+  // TODO(X64): Enable inline cache for StoreIC.
+#ifdef V8_TARGET_ARCH_X64
+  USE(&LookupForWrite);  // The compiler complains otherwise.
+#else
   // Lookup the property locally in the receiver.
   if (FLAG_use_ic && !receiver->IsJSGlobalProxy()) {
     LookupResult lookup;
@@ -979,6 +995,7 @@ Object* StoreIC::Store(State state,
       UpdateCaches(&lookup, state, receiver, name, value);
     }
   }
+#endif
 
   // Set the property.
   return receiver->SetProperty(*name, *value, NONE);
@@ -1097,10 +1114,13 @@ Object* KeyedStoreIC::Store(State state,
     LookupResult lookup;
     receiver->LocalLookup(*name, &lookup);
 
+    // TODO(X64): Enable inline cache for KeyedStoreIC.
+#ifndef V8_TARGET_ARCH_X64
     // Update inline cache and stub cache.
     if (FLAG_use_ic && lookup.IsLoaded()) {
       UpdateCaches(&lookup, state, receiver, name, value);
     }
+#endif
 
     // Set the property.
     return receiver->SetProperty(*name, *value, NONE);
diff --git a/src/ic.h b/src/ic.h
index 7d033778de..c62c24ee5e 100644
--- a/src/ic.h
+++ b/src/ic.h
@@ -49,7 +49,8 @@ namespace internal {
   ICU(StoreInterceptorProperty)
 
 //
-// IC is the base class for LoadIC, StoreIC and CallIC.
+// IC is the base class for LoadIC, StoreIC, CallIC, KeyedLoadIC,
+// and KeyedStoreIC.
 //
 class IC {
  public:
@@ -219,8 +220,8 @@ class LoadIC: public IC {
   static void GenerateFunctionPrototype(MacroAssembler* masm);
 
   // The offset from the inlined patch site to the start of the
-  // inlined load instruction.  It is 7 bytes (test eax, imm) plus
-  // 6 bytes (jne slow_label).
+  // inlined load instruction.  It is architecture-dependent, and not
+  // used on ARM.
   static const int kOffsetToLoadInstruction;
 
  private:
diff --git a/src/x64/assembler-x64.cc b/src/x64/assembler-x64.cc
index c4ee454836..f843078d82 100644
--- a/src/x64/assembler-x64.cc
+++ b/src/x64/assembler-x64.cc
@@ -2183,48 +2183,3 @@ const int RelocInfo::kApplyMask = 1 << RelocInfo::INTERNAL_REFERENCE;
 
 
 } }  // namespace v8::internal
-
-
-// TODO(x64): Implement and move these to their correct cc-files:
-#include "ast.h"
-#include "bootstrapper.h"
-#include "codegen-inl.h"
-#include "cpu.h"
-#include "debug.h"
-#include "disasm.h"
-#include "disassembler.h"
-#include "frames-inl.h"
-#include "x64/macro-assembler-x64.h"
-#include "x64/regexp-macro-assembler-x64.h"
-#include "ic-inl.h"
-#include "log.h"
-#include "macro-assembler.h"
-#include "parser.h"
-#include "regexp-macro-assembler.h"
-#include "regexp-stack.h"
-#include "register-allocator-inl.h"
-#include "register-allocator.h"
-#include "runtime.h"
-#include "scopes.h"
-#include "serialize.h"
-#include "stub-cache.h"
-#include "unicode.h"
-
-namespace v8 {
-namespace internal {
-
-
-void BreakLocationIterator::ClearDebugBreakAtReturn() {
-  UNIMPLEMENTED();
-}
-
-bool BreakLocationIterator::IsDebugBreakAtReturn()  {
-  UNIMPLEMENTED();
-  return false;
-}
-
-void BreakLocationIterator::SetDebugBreakAtReturn()  {
-  UNIMPLEMENTED();
-}
-
-} }  // namespace v8::internal
diff --git a/src/x64/debug-x64.cc b/src/x64/debug-x64.cc
index e94e781d48..177eb90a49 100644
--- a/src/x64/debug-x64.cc
+++ b/src/x64/debug-x64.cc
@@ -80,6 +80,21 @@ void Debug::GenerateStubNoRegistersDebugBreak(MacroAssembler* masm) {
   masm->int3();  // UNIMPLEMENTED
 }
 
+void BreakLocationIterator::ClearDebugBreakAtReturn() {
+  // TODO(X64): Implement this when we start setting Debug breaks.
+  UNIMPLEMENTED();
+}
+
+bool BreakLocationIterator::IsDebugBreakAtReturn()  {
+  // TODO(X64): Implement this when we start setting Debug breaks.
+  UNIMPLEMENTED();
+  return false;
+}
+
+void BreakLocationIterator::SetDebugBreakAtReturn()  {
+  UNIMPLEMENTED();
+}
+
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal
diff --git a/src/x64/ic-x64.cc b/src/x64/ic-x64.cc
index 7b8699f6d3..04dc54b7e7 100644
--- a/src/x64/ic-x64.cc
+++ b/src/x64/ic-x64.cc
@@ -43,11 +43,11 @@ namespace internal {
 
 
 void KeyedLoadIC::ClearInlinedVersion(Address address) {
-  UNIMPLEMENTED();
+  // TODO(X64): Implement this when LoadIC is enabled.
 }
 
 void KeyedStoreIC::ClearInlinedVersion(Address address) {
-  UNIMPLEMENTED();
+  // TODO(X64): Implement this when LoadIC is enabled.
 }
 
 void KeyedStoreIC::RestoreInlinedVersion(Address address) {
@@ -78,22 +78,32 @@ void KeyedLoadIC::Generate(MacroAssembler* masm,
 
 
 void KeyedLoadIC::GenerateGeneric(MacroAssembler* masm) {
-  masm->int3();  // UNIMPLEMENTED.
-  masm->movq(kScratchRegister, Immediate(0xC0AB));  // Debugging aid.
+  // ----------- S t a t e -------------
+  //  -- rsp[0] : return address
+  //  -- rsp[8] : name
+  //  -- rsp[16] : receiver
+  // -----------------------------------
+
+  Generate(masm, ExternalReference(Runtime::kKeyedGetProperty));
 }
 
 void KeyedLoadIC::GenerateMiss(MacroAssembler* masm) {
-  masm->int3();  // UNIMPLEMENTED.
-  masm->movq(kScratchRegister, Immediate(0xC1AB));  // Debugging aid.
+  // ----------- S t a t e -------------
+  //  -- rsp[0] : return address
+  //  -- rsp[8] : name
+  //  -- rsp[16] : receiver
+  // -----------------------------------
+
+  Generate(masm, ExternalReference(Runtime::kKeyedGetProperty));
 }
 
 bool KeyedLoadIC::PatchInlinedLoad(Address address, Object* map) {
-  UNIMPLEMENTED();
+  // Never patch the map in the map check, so the check always fails.
   return false;
 }
 
 bool KeyedStoreIC::PatchInlinedStore(Address address, Object* map) {
-  UNIMPLEMENTED();
+  // Never patch the map in the map check, so the check always fails.
   return false;
 }
 
@@ -163,13 +173,11 @@ void KeyedStoreIC::Generate(MacroAssembler* masm, ExternalReference const& f) {
 }
 
 void KeyedStoreIC::GenerateExtendStorage(MacroAssembler* masm) {
-  masm->int3();  // UNIMPLEMENTED.
-  masm->movq(kScratchRegister, Immediate(0xC2AB));  // Debugging aid.
+  Generate(masm, ExternalReference(IC_Utility(kKeyedStoreIC_Miss)));
 }
 
 void KeyedStoreIC::GenerateGeneric(MacroAssembler* masm) {
-  masm->int3();  // UNIMPLEMENTED.
-  masm->movq(kScratchRegister, Immediate(0xC3AB));  // Debugging aid.
+  Generate(masm, ExternalReference(IC_Utility(kKeyedStoreIC_Miss)));
 }
 
 Object* KeyedStoreStubCompiler::CompileStoreField(JSObject* object,
@@ -228,20 +236,24 @@ void CallIC::Generate(MacroAssembler* masm,
   __ InvokeFunction(rdi, actual, JUMP_FUNCTION);
 }
 
-void CallIC::GenerateMegamorphic(MacroAssembler* a, int b) {
-  UNIMPLEMENTED();
+void CallIC::GenerateMegamorphic(MacroAssembler* masm, int argc) {
+  // Cache miss: Jump to runtime.
+  Generate(masm, argc, ExternalReference(IC_Utility(kCallIC_Miss)));
 }
 
-void CallIC::GenerateNormal(MacroAssembler* a, int b) {
-  UNIMPLEMENTED();
+void CallIC::GenerateNormal(MacroAssembler* masm, int argc) {
+  // Cache miss: Jump to runtime.
+  Generate(masm, argc, ExternalReference(IC_Utility(kCallIC_Miss)));
 }
 
 
+// The offset from the inlined patch site to the start of the
+// inlined load instruction.
 const int LoadIC::kOffsetToLoadInstruction = 20;
 
 
 void LoadIC::ClearInlinedVersion(Address address) {
-  UNIMPLEMENTED();
+  // TODO(X64): Implement this when LoadIC is enabled.
 }
 
 
@@ -266,33 +278,27 @@ void LoadIC::Generate(MacroAssembler* masm, ExternalReference const& f) {
 
 
 void LoadIC::GenerateArrayLength(MacroAssembler* masm) {
-  masm->int3();  // UNIMPLEMENTED.
-  masm->movq(kScratchRegister, Immediate(0xC4AB));  // Debugging aid.
+  Generate(masm, ExternalReference(IC_Utility(kLoadIC_Miss)));
 }
 
 void LoadIC::GenerateFunctionPrototype(MacroAssembler* masm) {
-  masm->int3();  // UNIMPLEMENTED.
-  masm->movq(kScratchRegister, Immediate(0xC5AB));  // Debugging aid.
+  Generate(masm, ExternalReference(IC_Utility(kLoadIC_Miss)));
 }
 
 void LoadIC::GenerateMegamorphic(MacroAssembler* masm) {
-  masm->int3();  // UNIMPLEMENTED.
-  masm->movq(kScratchRegister, Immediate(0xC6AB));  // Debugging aid.
+  Generate(masm, ExternalReference(IC_Utility(kLoadIC_Miss)));
 }
 
 void LoadIC::GenerateMiss(MacroAssembler* masm) {
-  masm->int3();  // UNIMPLEMENTED.
-  masm->movq(kScratchRegister, Immediate(0xC7AB));  // Debugging aid.
+  Generate(masm, ExternalReference(IC_Utility(kLoadIC_Miss)));
 }
 
 void LoadIC::GenerateNormal(MacroAssembler* masm) {
-  masm->int3();  // UNIMPLEMENTED.
-  masm->movq(kScratchRegister, Immediate(0xC8AB));  // Debugging aid.
+  Generate(masm, ExternalReference(IC_Utility(kLoadIC_Miss)));
 }
 
 void LoadIC::GenerateStringLength(MacroAssembler* masm) {
-  masm->int3();  // UNIMPLEMENTED.
-  masm->movq(kScratchRegister, Immediate(0xC9AB));  // Debugging aid.
+  Generate(masm, ExternalReference(IC_Utility(kLoadIC_Miss)));
 }
 
 bool LoadIC::PatchInlinedLoad(Address address, Object* map, int index) {
@@ -319,13 +325,11 @@ void StoreIC::Generate(MacroAssembler* masm, ExternalReference const& f) {
 }
 
 void StoreIC::GenerateExtendStorage(MacroAssembler* masm) {
-  masm->int3();  // UNIMPLEMENTED.
-  masm->movq(kScratchRegister, Immediate(0xCAAB));  // Debugging aid.
+  Generate(masm, ExternalReference(IC_Utility(kStoreIC_Miss)));
 }
 
 void StoreIC::GenerateMegamorphic(MacroAssembler* masm) {
-  masm->int3();  // UNIMPLEMENTED.
-  masm->movq(kScratchRegister, Immediate(0xCBAB));  // Debugging aid.
+  Generate(masm, ExternalReference(IC_Utility(kStoreIC_Miss)));
 }