diff --git a/src/alloy/backend/x64/optimizer/optimizer_passes.h b/src/alloy/backend/x64/optimizer/optimizer_passes.h
index 6e1bb559c..88ad1042a 100644
--- a/src/alloy/backend/x64/optimizer/optimizer_passes.h
+++ b/src/alloy/backend/x64/optimizer/optimizer_passes.h
@@ -12,5 +12,6 @@
 
 #include <alloy/backend/x64/optimizer/passes/reachability_pass.h>
 #include <alloy/backend/x64/optimizer/passes/redundant_mov_pass.h>
+#include <alloy/backend/x64/optimizer/passes/register_allocation_pass.h>
 
 #endif  // ALLOY_BACKEND_X64_OPTIMIZER_PASSES_H_
diff --git a/src/alloy/backend/x64/optimizer/passes/reachability_pass.cc b/src/alloy/backend/x64/optimizer/passes/reachability_pass.cc
index 77d542ecb..633600c27 100644
--- a/src/alloy/backend/x64/optimizer/passes/reachability_pass.cc
+++ b/src/alloy/backend/x64/optimizer/passes/reachability_pass.cc
@@ -28,6 +28,7 @@ int ReachabilityPass::Run(LIRBuilder* builder) {
 
   // TODO(benvanik): dead block removal.
 
+  // Remove unneeded jumps.
   auto block = builder->first_block();
   while (block) {
     auto tail = block->instr_tail;
diff --git a/src/alloy/backend/x64/optimizer/passes/register_allocation_pass.cc b/src/alloy/backend/x64/optimizer/passes/register_allocation_pass.cc
new file mode 100644
index 000000000..298dca4b9
--- /dev/null
+++ b/src/alloy/backend/x64/optimizer/passes/register_allocation_pass.cc
@@ -0,0 +1,27 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2013 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include <alloy/backend/x64/optimizer/passes/register_allocation_pass.h>
+
+using namespace alloy;
+using namespace alloy::backend::x64::lir;
+using namespace alloy::backend::x64::optimizer;
+using namespace alloy::backend::x64::optimizer::passes;
+
+
+RegisterAllocationPass::RegisterAllocationPass() :
+    OptimizerPass() {
+}
+
+RegisterAllocationPass::~RegisterAllocationPass() {
+}
+
+int RegisterAllocationPass::Run(LIRBuilder* builder) {
+  return 0;
+}
diff --git a/src/alloy/backend/x64/optimizer/passes/register_allocation_pass.h b/src/alloy/backend/x64/optimizer/passes/register_allocation_pass.h
new file mode 100644
index 000000000..eb88a6535
--- /dev/null
+++ b/src/alloy/backend/x64/optimizer/passes/register_allocation_pass.h
@@ -0,0 +1,39 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2013 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef ALLOY_BACKEND_X64_OPTIMIZER_PASSES_REGISTER_ALLOCATION_PASS_H_
+#define ALLOY_BACKEND_X64_OPTIMIZER_PASSES_REGISTER_ALLOCATION_PASS_H_
+
+#include <alloy/backend/x64/optimizer/optimizer_pass.h>
+
+
+namespace alloy {
+namespace backend {
+namespace x64 {
+namespace optimizer {
+namespace passes {
+
+
+class RegisterAllocationPass : public OptimizerPass {
+public:
+  RegisterAllocationPass();
+  virtual ~RegisterAllocationPass();
+
+  virtual int Run(lir::LIRBuilder* builder);
+};
+
+
+}  // namespace passes
+}  // namespace optimizer
+}  // namespace x64
+}  // namespace backend
+}  // namespace alloy
+
+
+#endif  // ALLOY_BACKEND_X64_OPTIMIZER_PASSES_REGISTER_ALLOCATION_PASS_H_
diff --git a/src/alloy/backend/x64/optimizer/passes/sources.gypi b/src/alloy/backend/x64/optimizer/passes/sources.gypi
index 933cc3bff..6d80257ca 100644
--- a/src/alloy/backend/x64/optimizer/passes/sources.gypi
+++ b/src/alloy/backend/x64/optimizer/passes/sources.gypi
@@ -5,5 +5,7 @@
     'reachability_pass.h',
     'redundant_mov_pass.cc',
     'redundant_mov_pass.h',
+    'register_allocation_pass.cc',
+    'register_allocation_pass.h',
   ],
 }
diff --git a/src/alloy/backend/x64/x64_assembler.cc b/src/alloy/backend/x64/x64_assembler.cc
index ee123c1f2..29290e7e8 100644
--- a/src/alloy/backend/x64/x64_assembler.cc
+++ b/src/alloy/backend/x64/x64_assembler.cc
@@ -60,6 +60,7 @@ int X64Assembler::Initialize() {
   builder_ = new LIRBuilder(x64_backend_);
 
   optimizer_ = new Optimizer(backend_->runtime());
+  optimizer_->AddPass(new passes::RegisterAllocationPass());
   optimizer_->AddPass(new passes::RedundantMovPass());
   optimizer_->AddPass(new passes::ReachabilityPass());