diff --git a/Android.mk b/Android.mk
index 3e17072..162becb 100644
--- a/Android.mk
+++ b/Android.mk
@@ -87,9 +87,6 @@
 ifeq ($(ART_USE_LLVM_COMPILER),true)
 include $(build_path)/Android.libart-compiler-llvm.mk
 endif
-ifeq ($(ART_USE_GREENLAND_COMPILER),true)
-include $(build_path)/Android.libart-compiler-greenland.mk
-endif
 include $(build_path)/Android.executable.mk
 include $(build_path)/Android.oat.mk
 
diff --git a/build/Android.common.mk b/build/Android.common.mk
index 178af64..c18d46f 100644
--- a/build/Android.common.mk
+++ b/build/Android.common.mk
@@ -24,7 +24,6 @@
 ART_USE_PORTABLE_COMPILER := true
 endif
 ifeq ($(ART_USE_PORTABLE_COMPILER),true)
-WITH_ART_USE_QUICK_COMPILER := true
 WITH_ART_USE_LLVM_COMPILER := true
 endif
 
@@ -39,48 +38,8 @@
 ART_USE_LLVM_COMPILER := true
 endif
 
-ART_USE_DEXLANG_FRONTEND := false
-ifeq ($(ART_USE_LLVM_COMPILER),true)
-  ifneq ($(wildcard art/USE_DEXLANG_FRONTEND),)
-  $(info Enabling ART_USE_DEXLANG_FRONTEND because of existence of art/USE_DEXLANG_FRONTEND)
-  ART_USE_DEXLANG_FRONTEND := true
-  endif
-  ifeq ($(WITH_ART_USE_DEXLANG_FRONTEND),true)
-  $(info Enabling ART_USE_DEXLANG_FRONTEND because WITH_ART_USE_DEXLANG_FRONTEND=true)
-  ART_USE_DEXLANG_FRONTEND := true
-  endif
-endif
-
-ART_USE_GREENLAND_COMPILER := false
-ifneq ($(wildcard art/USE_GREENLAND_COMPILER),)
-$(info Enabling ART_USE_GREENLAND_COMPILER because of existence of art/USE_GREENLAND_COMPILER)
-ART_USE_GREENLAND_COMPILER := true
-endif
-ifeq ($(WITH_ART_USE_GREENLAND_COMPILER),true)
-$(info Enabling ART_USE_GREENLAND_COMPILER because WITH_ART_USE_GREENLAND_COMPILER=true)
-ART_USE_GREENLAND_COMPILER := true
-endif
-
-ART_USE_QUICK_COMPILER := false
-ifneq ($(wildcard art/USE_QUICK_COMPILER),)
-ART_USE_QUICK_COMPILER := true
-$(info Enabling ART_USE_QUICK_COMPILER because of existence of art/USE_QUICK_COMPILER)
-endif
-ifeq ($(WITH_ART_USE_QUICK_COMPILER),true)
-ART_USE_QUICK_COMPILER := true
-$(info Enabling ART_USE_QUICK_COMPILER because WITH_ART_USE_QUICK_COMPILER=true)
-endif
-
-ifeq ($(words $(filter true,$(ART_USE_LLVM_COMPILER) $(ART_USE_GREENLAND_COMPILER) $(ART_USE_QUICK_COMPILER))),0)
-ART_REQUIRE_LLVM := false
-else #!0
-ART_REQUIRE_LLVM := true
-endif #!0
-
-ifeq ($(ART_REQUIRE_LLVM),true)
 LLVM_ROOT_PATH := external/llvm
 include $(LLVM_ROOT_PATH)/llvm.mk
-endif
 
 # directory used for gtests on device
 ART_NATIVETEST_DIR := /data/nativetest/art
@@ -275,18 +234,6 @@
 	src/compiler_llvm/runtime_support_llvm.cc
 endif
 
-ifeq ($(ART_USE_GREENLAND_COMPILER),true)
-LIBART_COMMON_SRC_FILES += \
-	src/greenland/inferred_reg_category_map.cc \
-	src/greenland/runtime_entry_points.cc \
-	src/greenland/runtime/support_alloc.cc \
-	src/greenland/runtime/support_cast.cc \
-	src/greenland/runtime/support_dexcache.cc \
-	src/greenland/runtime/support_exception.cc \
-	src/greenland/runtime/support_field.cc \
-	src/greenland/runtime/support_thread.cc
-endif
-
 LIBART_COMMON_SRC_FILES += \
 	src/oat/runtime/context.cc \
 	src/oat/runtime/support_alloc.cc \
diff --git a/build/Android.executable.mk b/build/Android.executable.mk
index ac1d64e..d06b200 100644
--- a/build/Android.executable.mk
+++ b/build/Android.executable.mk
@@ -20,17 +20,9 @@
 ART_EXECUTABLES_CFLAGS :=
 ifeq ($(ART_USE_LLVM_COMPILER),true)
   ART_EXECUTABLES_CFLAGS += -DART_USE_LLVM_COMPILER=1
-  ifeq ($(ART_USE_DEXLANG_FRONTEND),true)
-    ART_EXECUTABLES_CFLAGS += -DART_USE_DEXLANG_FRONTEND=1
-  endif
 endif
-
-ifeq ($(ART_USE_GREENLAND_COMPILER),true)
-  ART_EXECUTABLES_CFLAGS += -DART_USE_GREENLAND_COMPILER=1
-endif
-
-ifeq ($(ART_USE_QUICK_COMPILER),true)
-  ART_EXECUTABLES_CFLAGS += -DART_USE_QUICK_COMPILER=1
+ifeq ($(ART_USE_PORTABLE_COMPILER),true)
+  ART_EXECUTABLES_CFLAGS += -DART_USE_PORTABLE_COMPILER=1
 endif
 
 # $(1): executable ("d" will be appended for debug version)
diff --git a/build/Android.gtest.mk b/build/Android.gtest.mk
index de8c502..f469dbd 100644
--- a/build/Android.gtest.mk
+++ b/build/Android.gtest.mk
@@ -22,17 +22,9 @@
 ART_TEST_CFLAGS :=
 ifeq ($(ART_USE_LLVM_COMPILER),true)
   ART_TEST_CFLAGS += -DART_USE_LLVM_COMPILER=1
-  ifeq ($(ART_USE_DEXLANG_FRONTEND),true)
-    ART_TEST_CFLAGS += -DART_USE_DEXLANG_FRONTEND=1
-  endif
 endif
-
-ifeq ($(ART_USE_GREENLAND_COMPILER),true)
-  ART_TEST_CFLAGS += -DART_USE_GREENLAND_COMPILER=1
-endif
-
-ifeq ($(ART_USE_QUICK_COMPILER),true)
-  ART_TEST_CFLAGS += -DART_USE_QUICK_COMPILER=1
+ifeq ($(ART_USE_PORTABLE_COMPILER),true)
+  ART_TEST_CFLAGS += -DART_USE_PORTABLE_COMPILER=1
 endif
 
 # $(1): target or host
diff --git a/build/Android.libart-compiler-greenland.mk b/build/Android.libart-compiler-greenland.mk
deleted file mode 100644
index 9baef69..0000000
--- a/build/Android.libart-compiler-greenland.mk
+++ /dev/null
@@ -1,206 +0,0 @@
-#
-# Copyright (C) 2012 The Android Open Source Project
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-
-LIBART_COMPILER_GREENLAND_CFLAGS := -DART_USE_GREENLAND_COMPILER=1
-
-LIBART_COMPILER_GREENLAND_SRC_FILES += \
-	src/greenland/inferred_reg_category_map.cc \
-	src/greenland/dalvik_reg.cc \
-	src/greenland/dex_lang.cc \
-	src/greenland/gbc_context.cc \
-	src/greenland/greenland.cc \
-	src/greenland/intrinsic_helper.cc \
-	src/greenland/register_allocator.cc \
-	src/greenland/target_codegen_machine.cc \
-	src/greenland/target_registry.cc \
-	src/oat/jni/calling_convention.cc \
-	src/oat/jni/jni_compiler.cc \
-	src/oat/jni/arm/calling_convention_arm.cc \
-	src/oat/jni/mips/calling_convention_mips.cc \
-	src/oat/jni/x86/calling_convention_x86.cc
-
-LIBART_COMPILER_GREENLAND_arm_SRC_FILES += \
-  src/greenland/arm/arm_codegen_machine.cc \
-	src/greenland/arm/arm_invoke_stub_compiler.cc
-
-LIBART_COMPILER_GREENLAND_mips_SRC_FILES += \
-  src/greenland/mips/mips_codegen_machine.cc \
-  src/greenland/mips/mips_invoke_stub_compiler.cc
-
-LIBART_COMPILER_GREENLAND_x86_SRC_FILES += \
-  src/greenland/x86/x86_codegen_machine.cc \
-  src/greenland/x86/x86_lir_emitter.cc \
-  src/greenland/x86/x86_lir_info.cc \
-  src/greenland/x86/x86_invoke_stub_compiler.cc
-
-########################################################################
-
-include $(CLEAR_VARS)
-LOCAL_CPP_EXTENSION := $(ART_CPP_EXTENSION)
-LOCAL_MODULE := target_lir_builder_generator
-LOCAL_MODULE_TAGS := optional
-LOCAL_IS_HOST_MODULE := true
-LOCAL_SRC_FILES := src/greenland/tools/target_lir_builder_generator.cc
-LOCAL_CFLAGS := $(ART_HOST_CFLAGS) $(ART_HOST_DEBUG_CFLAGS)
-LOCAL_C_INCLUDES := $(ART_C_INCLUDES)
-include $(BUILD_HOST_EXECUTABLE)
-TARGET_LIR_BUILDER_GENERATOR := $(LOCAL_BUILT_MODULE)
-
-########################################################################
-
-# $(1): target or host
-# $(2): ndebug or debug
-define build-libart-compiler-greenland
-  ifneq ($(1),target)
-    ifneq ($(1),host)
-      $$(error expected target or host for argument 1, received $(1))
-    endif
-  endif
-  ifneq ($(2),ndebug)
-    ifneq ($(2),debug)
-      $$(error expected ndebug or debug for argument 2, received $(2))
-    endif
-  endif
-
-  art_target_or_host := $(1)
-  art_ndebug_or_debug := $(2)
-
-  include $(CLEAR_VARS)
-  ifeq ($$(art_target_or_host),target)
-    include external/stlport/libstlport.mk
-  endif
-  LOCAL_CPP_EXTENSION := $(ART_CPP_EXTENSION)
-  ifeq ($$(art_ndebug_or_debug),ndebug)
-    LOCAL_MODULE := libart-compiler-greenland
-  else # debug
-    LOCAL_MODULE := libartd-compiler-greenland
-  endif
-
-  LOCAL_MODULE_TAGS := optional
-  LOCAL_MODULE_CLASS := SHARED_LIBRARIES
-
-  LOCAL_SRC_FILES := $(LIBART_COMPILER_GREENLAND_SRC_FILES)
-  LOCAL_CFLAGS := $(LIBART_COMPILER_GREENLAND_CFLAGS)
-  ifeq ($$(art_target_or_host),target)
-    LOCAL_CFLAGS += $(ART_TARGET_CFLAGS)
-  else # host
-    LOCAL_IS_HOST_MODULE := true
-    LOCAL_CFLAGS += $(ART_HOST_CFLAGS)
-  endif
-
-  LOCAL_C_INCLUDES += $(ART_C_INCLUDES)
-
-  ifeq ($$(art_target_or_host),target)
-    ENUM_INCLUDE_LIR_TARGETS := arm
-    LOCAL_SRC_FILES += \
-      $(LIBART_COMPILER_GREENLAND_$(TARGET_ARCH)_SRC_FILES)
-  else
-    ENUM_INCLUDE_LIR_TARGETS := arm mips x86
-    LOCAL_SRC_FILES += \
-      $(LIBART_COMPILER_GREENLAND_arm_SRC_FILES) \
-      $(LIBART_COMPILER_GREENLAND_mips_SRC_FILES) \
-      $(LIBART_COMPILER_GREENLAND_x86_SRC_FILES)
-  endif
-
-  GENERATED_SRC_DIR := $$(call intermediates-dir-for,$$(LOCAL_MODULE_CLASS),$$(LOCAL_MODULE),$$(LOCAL_IS_HOST_MODULE),)
-  ENUM_TARGEET_LIR_BUILDER_INC_FILES := $$(foreach lir_target, $$(ENUM_INCLUDE_LIR_TARGETS), $$(lir_target)_lir_builder_base.inc)
-  ENUM_TARGET_LIR_BUILDER_OUT_GEN := $$(addprefix $$(GENERATED_SRC_DIR)/, $$(ENUM_TARGEET_LIR_BUILDER_INC_FILES))
-
-$$(ENUM_TARGET_LIR_BUILDER_OUT_GEN): PRIVATE_LIR_TARGET = $$(subst _lir_builder_base.inc,,$$(notdir $$@))
-$$(ENUM_TARGET_LIR_BUILDER_OUT_GEN): %.inc : $$(TARGET_LIR_BUILDER_GENERATOR)
-	@echo "target Generated: $$@"
-	$$(hide) $$(TARGET_LIR_BUILDER_GENERATOR) $$(PRIVATE_LIR_TARGET) > $$@
-
-LOCAL_GENERATED_SOURCES += $$(ENUM_TARGET_LIR_BUILDER_OUT_GEN)
-
-  LOCAL_STATIC_LIBRARIES += \
-    libLLVMBitWriter \
-    libLLVMBitReader \
-    libLLVMScalarOpts \
-    libLLVMInstCombine \
-    libLLVMTransformUtils \
-    libLLVMAnalysis \
-    libLLVMTarget \
-    libLLVMCore \
-    libLLVMSupport
-  LOCAL_SHARED_LIBRARIES := liblog libnativehelper
-  ifeq ($$(art_target_or_host),target)
-    LOCAL_SHARED_LIBRARIES += libcutils libstlport libz libdl
-    LOCAL_SHARED_LIBRARIES += libdynamic_annotations # tsan support
-    LOCAL_SHARED_LIBRARIES += libcorkscrew # native stack trace support
-  else # host
-    LOCAL_STATIC_LIBRARIES += libcutils
-    LOCAL_SHARED_LIBRARIES += libz-host
-    LOCAL_SHARED_LIBRARIES += libdynamic_annotations-host # tsan support
-    LOCAL_LDLIBS := -ldl -lpthread
-    ifeq ($(HOST_OS),linux)
-      LOCAL_LDLIBS += -lrt
-    endif
-  endif
-  ifeq ($$(art_ndebug_or_debug),debug)
-    ifeq ($$(art_target_or_host),target)
-      LOCAL_CFLAGS += $(ART_TARGET_DEBUG_CFLAGS)
-    else # host
-      LOCAL_CFLAGS += $(ART_HOST_DEBUG_CFLAGS)
-    endif
-    LOCAL_SHARED_LIBRARIES += libartd
-  else
-    ifeq ($$(art_target_or_host),target)
-      LOCAL_CFLAGS += $(ART_TARGET_NON_DEBUG_CFLAGS)
-    else # host
-      LOCAL_CFLAGS += $(ART_HOST_NON_DEBUG_CFLAGS)
-    endif
-    LOCAL_SHARED_LIBRARIES += libart
-  endif
-  ifeq ($$(art_target_or_host),target)
-    include $(LLVM_GEN_INTRINSICS_MK)
-    include $(LLVM_DEVICE_BUILD_MK)
-    include $(BUILD_SHARED_LIBRARY)
-  else # host
-    include $(LLVM_GEN_INTRINSICS_MK)
-    include $(LLVM_HOST_BUILD_MK)
-    include $(BUILD_HOST_SHARED_LIBRARY)
-  endif
-
-  ifeq ($$(art_target_or_host),target)
-    ifeq ($$(art_ndebug_or_debug),debug)
-      $(TARGET_OUT_EXECUTABLES)/dex2oatd: $$(LOCAL_INSTALLED_MODULE)
-    else
-      $(TARGET_OUT_EXECUTABLES)/dex2oat: $$(LOCAL_INSTALLED_MODULE)
-    endif
-  else # host
-    ifeq ($$(art_ndebug_or_debug),debug)
-      $(HOST_OUT_EXECUTABLES)/dex2oatd: $$(LOCAL_INSTALLED_MODULE)
-    else
-      $(HOST_OUT_EXECUTABLES)/dex2oat: $$(LOCAL_INSTALLED_MODULE)
-    endif
-  endif
-endef
-
-
-ifeq ($(ART_BUILD_TARGET_NDEBUG),true)
-  $(eval $(call build-libart-compiler-greenland,target,ndebug))
-endif
-ifeq ($(ART_BUILD_TARGET_DEBUG),true)
-  $(eval $(call build-libart-compiler-greenland,target,debug))
-endif
-ifeq ($(ART_BUILD_HOST_NDEBUG),true)
-  $(eval $(call build-libart-compiler-greenland,host,ndebug))
-endif
-ifeq ($(ART_BUILD_HOST_DEBUG),true)
-  $(eval $(call build-libart-compiler-greenland,host,debug))
-endif
diff --git a/build/Android.libart-compiler-llvm.mk b/build/Android.libart-compiler-llvm.mk
index 332b809..48731f4 100644
--- a/build/Android.libart-compiler-llvm.mk
+++ b/build/Android.libart-compiler-llvm.mk
@@ -16,11 +16,8 @@
 
 
 LIBART_COMPILER_LLVM_CFLAGS := -DART_USE_LLVM_COMPILER
-ifeq ($(ART_USE_DEXLANG_FRONTEND),true)
-  LIBART_COMPILER_LLVM_CFLAGS += -DART_USE_DEXLANG_FRONTEND
-endif
-ifeq ($(ART_USE_QUICK_COMPILER),true)
-  LIBART_COMPILER_LLVM_CFLAGS += -DART_USE_QUICK_COMPILER
+ifeq ($(ART_USE_PORTABLE_COMPILER),true)
+  ART_TEST_CFLAGS += -DART_USE_PORTABLE_COMPILER=1
 endif
 
 LIBART_COMPILER_LLVM_SRC_FILES += \
@@ -38,37 +35,28 @@
 	src/compiler_llvm/stub_compiler.cc \
 	src/greenland/inferred_reg_category_map.cc
 
-ifeq ($(ART_USE_DEXLANG_FRONTEND),true)
+ifeq ($(ART_USE_PORTABLE_COMPILER),true)
   LIBART_COMPILER_LLVM_SRC_FILES += \
+    src/compiler/Dataflow.cc \
+    src/compiler/Frontend.cc \
+    src/compiler/IntermediateRep.cc \
+    src/compiler/Ralloc.cc \
+    src/compiler/SSATransformation.cc \
+    src/compiler/Utility.cc \
+    src/compiler/codegen/RallocUtil.cc \
+    src/compiler/codegen/arm/ArchUtility.cc \
+    src/compiler/codegen/arm/ArmRallocUtil.cc \
+    src/compiler/codegen/arm/Assemble.cc \
+    src/compiler/codegen/arm/armv7-a/Codegen.cc \
+    src/compiler_llvm/dalvik_reg.cc \
     src/compiler_llvm/gbc_expander.cc \
-    src/greenland/dalvik_reg.cc \
-    src/greenland/dex_lang.cc \
+    src/compiler_llvm/method_compiler.cc \
     src/greenland/intrinsic_helper.cc \
     src/greenland/ir_builder.cc
 else
-  ifeq ($(ART_USE_QUICK_COMPILER),true)
-    LIBART_COMPILER_LLVM_SRC_FILES += \
-      src/compiler/Dataflow.cc \
-      src/compiler/Frontend.cc \
-      src/compiler/IntermediateRep.cc \
-      src/compiler/Ralloc.cc \
-      src/compiler/SSATransformation.cc \
-      src/compiler/Utility.cc \
-      src/compiler/codegen/RallocUtil.cc \
-      src/compiler/codegen/arm/ArchUtility.cc \
-      src/compiler/codegen/arm/ArmRallocUtil.cc \
-      src/compiler/codegen/arm/Assemble.cc \
-      src/compiler/codegen/arm/armv7-a/Codegen.cc \
-      src/compiler_llvm/dalvik_reg.cc \
-      src/compiler_llvm/gbc_expander.cc \
-      src/compiler_llvm/method_compiler.cc \
-      src/greenland/intrinsic_helper.cc \
-      src/greenland/ir_builder.cc
-  else
-    LIBART_COMPILER_LLVM_SRC_FILES += \
-      src/compiler_llvm/dalvik_reg.cc \
-      src/compiler_llvm/method_compiler.cc
-  endif
+  LIBART_COMPILER_LLVM_SRC_FILES += \
+    src/compiler_llvm/dalvik_reg.cc \
+    src/compiler_llvm/method_compiler.cc
 endif
 
 # $(1): target or host
diff --git a/build/Android.libart-compiler.mk b/build/Android.libart-compiler.mk
index 994bcca..323017a 100644
--- a/build/Android.libart-compiler.mk
+++ b/build/Android.libart-compiler.mk
@@ -26,13 +26,9 @@
 	src/oat/jni/jni_compiler.cc \
 	src/oat/jni/arm/calling_convention_arm.cc \
 	src/oat/jni/mips/calling_convention_mips.cc \
-	src/oat/jni/x86/calling_convention_x86.cc
-
-ifeq ($(ART_USE_QUICK_COMPILER), true)
-LIBART_COMPILER_COMMON_SRC_FILES += \
+	src/oat/jni/x86/calling_convention_x86.cc \
 	src/greenland/ir_builder.cc \
 	src/greenland/intrinsic_helper.cc
-endif
 
 LIBART_COMPILER_arm_SRC_FILES += \
 	$(LIBART_COMPILER_COMMON_SRC_FILES) \
@@ -118,17 +114,15 @@
     endif
     LOCAL_SHARED_LIBRARIES += libart
   endif
-  ifeq ($(ART_USE_QUICK_COMPILER), true)
-    LOCAL_SHARED_LIBRARIES += libbcc
-  endif
+  LOCAL_SHARED_LIBRARIES += libbcc
 
   # TODO: temporary hack for testing.
   ifeq ($$(libart_compiler_arch),mips)
     LOCAL_CFLAGS += -D__mips_hard_float
   endif
 
-  ifeq ($(ART_USE_QUICK_COMPILER), true)
-    LOCAL_CFLAGS += -DART_USE_QUICK_COMPILER
+  ifeq ($(ART_USE_PORTABLE_COMPILER),true)
+    ART_TEST_CFLAGS += -DART_USE_PORTABLE_COMPILER=1
   endif
 
   LOCAL_C_INCLUDES += $(ART_C_INCLUDES)
@@ -139,19 +133,15 @@
     LOCAL_LDLIBS := -ldl -lpthread
   endif
   ifeq ($$(art_target_or_host),target)
-    ifeq ($(ART_USE_QUICK_COMPILER), true)
-      LOCAL_SHARED_LIBRARIES += libcutils
-      include $(LLVM_GEN_INTRINSICS_MK)
-      include $(LLVM_DEVICE_BUILD_MK)
-    endif
+    LOCAL_SHARED_LIBRARIES += libcutils
+    include $(LLVM_GEN_INTRINSICS_MK)
+    include $(LLVM_DEVICE_BUILD_MK)
     include $(BUILD_SHARED_LIBRARY)
   else # host
     LOCAL_IS_HOST_MODULE := true
-    ifeq ($(ART_USE_QUICK_COMPILER), true)
-      LOCAL_STATIC_LIBRARIES += libcutils
-      include $(LLVM_GEN_INTRINSICS_MK)
-      include $(LLVM_HOST_BUILD_MK)
-    endif
+    LOCAL_STATIC_LIBRARIES += libcutils
+    include $(LLVM_GEN_INTRINSICS_MK)
+    include $(LLVM_HOST_BUILD_MK)
     include $(BUILD_HOST_SHARED_LIBRARY)
   endif
 
diff --git a/build/Android.libart.mk b/build/Android.libart.mk
index 43ce31a..435056a 100644
--- a/build/Android.libart.mk
+++ b/build/Android.libart.mk
@@ -17,17 +17,9 @@
 LIBART_CFLAGS :=
 ifeq ($(ART_USE_LLVM_COMPILER),true)
   LIBART_CFLAGS += -DART_USE_LLVM_COMPILER=1
-  ifeq ($(ART_USE_DEXLANG_FRONTEND),true)
-    LIBART_CFLAGS += -DART_USE_DEXLANG_FRONTEND=1
-  endif
 endif
-
-ifeq ($(ART_USE_GREENLAND_COMPILER),true)
-  LIBART_CFLAGS += -DART_USE_GREENLAND_COMPILER=1
-endif
-
-ifeq ($(ART_USE_QUICK_COMPILER),true)
-  LIBART_CFLAGS += -DART_USE_QUICK_COMPILER=1
+ifeq ($(ART_USE_PORTABLE_COMPILER),true)
+  ART_TEST_CFLAGS += -DART_USE_PORTABLE_COMPILER=1
 endif
 
 # $(1): target or host
@@ -115,17 +107,12 @@
       LOCAL_LDLIBS += -lrt
     endif
   endif
+  include $(LLVM_GEN_INTRINSICS_MK)
   ifeq ($$(art_target_or_host),target)
-    ifeq ($(ART_REQUIRE_LLVM),true)
-      include $(LLVM_GEN_INTRINSICS_MK)
-      include $(LLVM_DEVICE_BUILD_MK)
-    endif
+    include $(LLVM_DEVICE_BUILD_MK)
     include $(BUILD_SHARED_LIBRARY)
   else # host
-    ifeq ($(ART_REQUIRE_LLVM),true)
-      include $(LLVM_GEN_INTRINSICS_MK)
-      include $(LLVM_HOST_BUILD_MK)
-    endif
+    include $(LLVM_HOST_BUILD_MK)
     include $(BUILD_HOST_SHARED_LIBRARY)
   endif
 endef
diff --git a/src/common_test.h b/src/common_test.h
index 560edeb..964db64 100644
--- a/src/common_test.h
+++ b/src/common_test.h
@@ -353,6 +353,16 @@
 #elif defined(__i386__)
     instruction_set = kX86;
 #endif
+
+    // TODO: make selectable
+#if defined(ART_USE_PORTABLE_COMPILER)
+    CompilerBackend compiler_backend = kPortable;
+#elif defined(ART_USE_LLVM_COMPILER)
+    CompilerBackend compiler_backend = kIceland; // TODO: remove
+#else
+    CompilerBackend compiler_backend = kQuick;
+#endif
+
     runtime_->SetJniDlsymLookupStub(Compiler::CreateJniDlsymLookupStub(instruction_set));
     runtime_->SetAbstractMethodErrorStubArray(Compiler::CreateAbstractMethodErrorStub(instruction_set));
     for (int i = 0; i < Runtime::kLastTrampolineMethodType; i++) {
@@ -374,7 +384,7 @@
     }
     class_linker_->FixupDexCaches(runtime_->GetResolutionMethod());
     image_classes_.reset(new std::set<std::string>);
-    compiler_.reset(new Compiler(instruction_set, true, 2, false, image_classes_.get(),
+    compiler_.reset(new Compiler(compiler_backend, instruction_set, true, 2, false, image_classes_.get(),
                                  true, true));
 
     runtime_->GetHeap()->VerifyHeap();  // Check for heap corruption before the test
diff --git a/src/compiler.cc b/src/compiler.cc
index 8d7f5b6..fdeb986 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -231,7 +231,7 @@
   DISALLOW_COPY_AND_ASSIGN(AOTCompilationStats);
 };
 
-static std::string MakeCompilerSoName(InstructionSet instruction_set) {
+static std::string MakeCompilerSoName(CompilerBackend compiler_backend, InstructionSet instruction_set) {
   // TODO: is the ARM/Thumb2 instruction set distinction really buying us anything,
   // or just causing hassle like this?
   if (instruction_set == kThumb2) {
@@ -249,13 +249,12 @@
   const char* suffix = (kIsDebugBuild ? "d" : "");
 
   // Work out the filename for the compiler library.
-#if defined(ART_USE_LLVM_COMPILER)
-  std::string library_name(StringPrintf("art%s-compiler-llvm", suffix));
-#elif defined(ART_USE_GREENLAND_COMPILER)
-  std::string library_name(StringPrintf("art%s-compiler-greenland", suffix));
-#else
-  std::string library_name(StringPrintf("art%s-compiler-%s", suffix, instruction_set_name.c_str()));
-#endif
+  std::string library_name;
+  if ((compiler_backend == kPortable) || (compiler_backend == kIceland)) {
+    library_name = StringPrintf("art%s-compiler-llvm", suffix);
+  } else {
+    library_name = StringPrintf("art%s-compiler-%s", suffix, instruction_set_name.c_str());
+  }
   std::string filename(StringPrintf(OS_SHARED_LIB_FORMAT_STR, library_name.c_str()));
 
 #if defined(__APPLE__)
@@ -291,16 +290,15 @@
   return fn;
 }
 
-Compiler::Compiler(InstructionSet instruction_set, bool image, size_t thread_count,
-                   bool support_debugging, const std::set<std::string>* image_classes,
+Compiler::Compiler(CompilerBackend compiler_backend, InstructionSet instruction_set, bool image,
+                   size_t thread_count, bool support_debugging, const std::set<std::string>* image_classes,
                    bool dump_stats, bool dump_timings)
-    : instruction_set_(instruction_set),
+    : compiler_backend_(compiler_backend),
+      instruction_set_(instruction_set),
       compiled_classes_lock_("compiled classes lock"),
       compiled_methods_lock_("compiled method lock"),
       compiled_invoke_stubs_lock_("compiled invoke stubs lock"),
-#if defined(ART_USE_LLVM_COMPILER)
       compiled_proxy_stubs_lock_("compiled proxy stubs lock"),
-#endif
       image_(image),
       thread_count_(thread_count),
       support_debugging_(support_debugging),
@@ -315,7 +313,7 @@
       jni_compiler_(NULL),
       create_invoke_stub_(NULL)
 {
-  std::string compiler_so_name(MakeCompilerSoName(instruction_set_));
+  std::string compiler_so_name(MakeCompilerSoName(compiler_backend_, instruction_set_));
   compiler_library_ = dlopen(compiler_so_name.c_str(), RTLD_LAZY);
   if (compiler_library_ == NULL) {
     LOG(FATAL) << "Couldn't find compiler library " << compiler_so_name << ": " << dlerror();
@@ -324,36 +322,29 @@
 
   CHECK_PTHREAD_CALL(pthread_key_create, (&tls_key_, NULL), "compiler tls key");
 
-#if defined(ART_USE_LLVM_COMPILER) || defined(ART_USE_GREENLAND_COMPILER)
-  // Initialize compiler_context_
+  // TODO: more work needed to combine initializations and allow per-method backend selection
   typedef void (*InitCompilerContextFn)(Compiler&);
-
-  InitCompilerContextFn init_compiler_context =
-    FindFunction<void (*)(Compiler&)>(compiler_so_name,
-                                      compiler_library_,
-                                      "ArtInitCompilerContext");
+  InitCompilerContextFn init_compiler_context;
+  if ((compiler_backend_ == kPortable) || (compiler_backend_ == kIceland)){
+    // Initialize compiler_context_
+    init_compiler_context = FindFunction<void (*)(Compiler&)>(compiler_so_name,
+                                                  compiler_library_, "ArtInitCompilerContext");
+    compiler_ = FindFunction<CompilerFn>(compiler_so_name, compiler_library_, "ArtCompileMethod");
+  } else {
+    init_compiler_context = FindFunction<void (*)(Compiler&)>(compiler_so_name,
+                                                  compiler_library_, "ArtInitQuickCompilerContext");
+    compiler_ = FindFunction<CompilerFn>(compiler_so_name, compiler_library_, "ArtQuickCompileMethod");
+  }
 
   init_compiler_context(*this);
-#elif defined(ART_USE_QUICK_COMPILER)
-  // Initialize compiler_context_
-  typedef void (*InitCompilerContextFn)(Compiler&);
 
-  InitCompilerContextFn init_compiler_context =
-    FindFunction<void (*)(Compiler&)>(compiler_so_name,
-                                      compiler_library_,
-                                      "ArtInitQuickCompilerContext");
-
-  init_compiler_context(*this);
-#endif
-
-  compiler_ = FindFunction<CompilerFn>(compiler_so_name, compiler_library_, "ArtCompileMethod");
   jni_compiler_ = FindFunction<JniCompilerFn>(compiler_so_name, compiler_library_, "ArtJniCompileMethod");
   create_invoke_stub_ = FindFunction<CreateInvokeStubFn>(compiler_so_name, compiler_library_, "ArtCreateInvokeStub");
 
-#if defined(ART_USE_LLVM_COMPILER)
-  create_proxy_stub_ = FindFunction<CreateProxyStubFn>(
-      compiler_so_name, compiler_library_, "ArtCreateProxyStub");
-#endif
+  if ((compiler_backend_ == kPortable) || (compiler_backend_ == kIceland)) {
+    create_proxy_stub_ = FindFunction<CreateProxyStubFn>(
+        compiler_so_name, compiler_library_, "ArtCreateProxyStub");
+  }
 
   CHECK(!Runtime::Current()->IsStarted());
   if (!image_) {
@@ -375,12 +366,10 @@
     MutexLock mu(self, compiled_invoke_stubs_lock_);
     STLDeleteValues(&compiled_invoke_stubs_);
   }
-#if defined(ART_USE_LLVM_COMPILER)
   {
     MutexLock mu(self, compiled_proxy_stubs_lock_);
     STLDeleteValues(&compiled_proxy_stubs_);
   }
-#endif
   {
     MutexLock mu(self, compiled_methods_lock_);
     STLDeleteElements(&code_to_patch_);
@@ -390,34 +379,21 @@
     STLDeleteElements(&methods_to_patch_);
   }
   CHECK_PTHREAD_CALL(pthread_key_delete, (tls_key_), "delete tls key");
-#if defined(ART_USE_LLVM_COMPILER)
-  // Uninitialize compiler_context_
   typedef void (*UninitCompilerContextFn)(Compiler&);
-
-  std::string compiler_so_name(MakeCompilerSoName(instruction_set_));
-
-  UninitCompilerContextFn uninit_compiler_context =
-    FindFunction<void (*)(Compiler&)>(compiler_so_name,
-                                      compiler_library_,
-                                      "ArtUnInitCompilerContext");
-
-  uninit_compiler_context(*this);
-#elif defined(ART_USE_QUICK_COMPILER)
+  std::string compiler_so_name(MakeCompilerSoName(compiler_backend_, instruction_set_));
+  UninitCompilerContextFn uninit_compiler_context;
   // Uninitialize compiler_context_
-  typedef void (*UninitCompilerContextFn)(Compiler&);
-
-  std::string compiler_so_name(MakeCompilerSoName(instruction_set_));
-
-  UninitCompilerContextFn uninit_compiler_context =
-    FindFunction<void (*)(Compiler&)>(compiler_so_name,
-                                      compiler_library_,
-                                      "ArtUnInitQuickCompilerContext");
-
+  // TODO: rework to combine initialization/uninitialization
+  if ((compiler_backend_ == kPortable) || (compiler_backend_ == kIceland)) {
+    uninit_compiler_context = FindFunction<void (*)(Compiler&)>(compiler_so_name,
+                                                    compiler_library_, "ArtUnInitCompilerContext");
+  } else {
+    uninit_compiler_context = FindFunction<void (*)(Compiler&)>(compiler_so_name,
+                                                    compiler_library_, "ArtUnInitQuickCompilerContext");
+  }
   uninit_compiler_context(*this);
-#endif
   if (compiler_library_ != NULL) {
     VLOG(compiler) << "dlclose(" << compiler_library_ << ")";
-#if !defined(ART_USE_QUICK_COMPILER)
     /*
      * FIXME: Temporary workaround
      * Apparently, llvm is adding dctors to atexit, but if we unload
@@ -430,7 +406,6 @@
      * What's the right thing to do here?
      */
     dlclose(compiler_library_);
-#endif
   }
 }
 
@@ -839,15 +814,15 @@
   // invoked, so this can be passed to the out-of-line runtime support code.
   direct_code = 0;
   direct_method = 0;
-#if !defined(ART_USE_LLVM_COMPILER)
-  if (sharp_type != kStatic && sharp_type != kDirect && sharp_type != kInterface) {
-    return;
+  if ((compiler_backend_ == kPortable) || (compiler_backend_ == kIceland)) {
+    if (sharp_type != kStatic && sharp_type != kDirect) {
+      return;
+    }
+  } else {
+    if (sharp_type != kStatic && sharp_type != kDirect && sharp_type != kInterface) {
+      return;
+    }
   }
-#else
-  if (sharp_type != kStatic && sharp_type != kDirect) {
-    return;
-  }
-#endif
   bool method_code_in_boot = method->GetDeclaringClass()->GetClassLoader() == NULL;
   if (!method_code_in_boot) {
     return;
@@ -1472,8 +1447,7 @@
     InsertInvokeStub(key, compiled_invoke_stub);
   }
 
-#if defined(ART_USE_LLVM_COMPILER)
-  if (!is_static) {
+  if (((compiler_backend_ == kPortable) || (compiler_backend_ == kIceland)) && !is_static) {
     const CompiledInvokeStub* compiled_proxy_stub = FindProxyStub(shorty);
     if (compiled_proxy_stub == NULL) {
       compiled_proxy_stub = (*create_proxy_stub_)(*this, shorty, shorty_len);
@@ -1481,7 +1455,6 @@
       InsertProxyStub(shorty, compiled_proxy_stub);
     }
   }
-#endif
 
   if (self->IsExceptionPending()) {
     ScopedObjectAccess soa(self);
@@ -1518,7 +1491,6 @@
   }
 }
 
-#if defined(ART_USE_LLVM_COMPILER)
 const CompiledInvokeStub* Compiler::FindProxyStub(const char* shorty) const {
   MutexLock mu(Thread::Current(), compiled_proxy_stubs_lock_);
   ProxyStubTable::const_iterator it = compiled_proxy_stubs_.find(shorty);
@@ -1541,7 +1513,6 @@
     compiled_proxy_stubs_.Put(shorty, compiled_proxy_stub);
   }
 }
-#endif
 
 CompiledClass* Compiler::GetCompiledClass(ClassReference ref) const {
   MutexLock mu(Thread::Current(), compiled_classes_lock_);
@@ -1563,17 +1534,15 @@
   return it->second;
 }
 
-#if defined(ART_USE_LLVM_COMPILER) || defined(ART_USE_QUICK_COMPILER)
 void Compiler::SetBitcodeFileName(std::string const& filename) {
   typedef void (*SetBitcodeFileNameFn)(Compiler&, std::string const&);
 
   SetBitcodeFileNameFn set_bitcode_file_name =
-    FindFunction<SetBitcodeFileNameFn>(MakeCompilerSoName(instruction_set_),
+    FindFunction<SetBitcodeFileNameFn>(MakeCompilerSoName(compiler_backend_, instruction_set_),
                                        compiler_library_,
                                        "compilerLLVMSetBitcodeFileName");
 
   set_bitcode_file_name(*this, filename);
 }
-#endif
 
 }  // namespace art
diff --git a/src/compiler.h b/src/compiler.h
index 5e9dbd7..e3a9f3b 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -40,9 +40,15 @@
 class OatCompilationUnit;
 class TimingLogger;
 
+enum CompilerBackend {
+  kQuick,
+  kQuickGBC,
+  kPortable,
+  kIceland  // Temporary - remove soon
+};
+
 // Thread-local storage compiler worker threads
 class CompilerTls {
-#if defined(ART_USE_QUICK_COMPILER)
   public:
     CompilerTls() : llvm_info_(NULL) {}
     ~CompilerTls() {}
@@ -53,7 +59,6 @@
 
   private:
     void* llvm_info_;
-#endif
 };
 
 class Compiler {
@@ -63,9 +68,9 @@
   // enabled.  "image_classes" lets the compiler know what classes it
   // can assume will be in the image, with NULL implying all available
   // classes.
-  explicit Compiler(InstructionSet instruction_set, bool image, size_t thread_count,
-                    bool support_debugging, const std::set<std::string>* image_classes,
-                    bool dump_stats, bool dump_timings);
+  explicit Compiler(CompilerBackend compiler_backend, InstructionSet instruction_set, bool image,
+                    size_t thread_count, bool support_debugging,
+                    const std::set<std::string>* image_classes, bool dump_stats, bool dump_timings);
 
   ~Compiler();
 
@@ -84,6 +89,10 @@
     return instruction_set_;
   }
 
+  CompilerBackend GetCompilerBackend() const {
+    return compiler_backend_;
+  }
+
   bool IsImage() const {
     return image_;
   }
@@ -119,9 +128,7 @@
   const CompiledInvokeStub* FindInvokeStub(const std::string& key) const
       LOCKS_EXCLUDED(compiled_invoke_stubs_lock_);
 
-#if defined(ART_USE_LLVM_COMPILER)
   const CompiledInvokeStub* FindProxyStub(const char* shorty) const;
-#endif
 
   // Callbacks from compiler to see what runtime checks must be generated.
 
@@ -175,9 +182,7 @@
                       size_t literal_offset)
       LOCKS_EXCLUDED(compiled_methods_lock_);
 
-#if defined(ART_USE_LLVM_COMPILER) || defined(ART_USE_QUICK_COMPILER)
   void SetBitcodeFileName(std::string const& filename);
-#endif
 
   void SetCompilerContext(void* compiler_context) {
     compiler_context_ = compiler_context;
@@ -298,13 +303,13 @@
   void InsertInvokeStub(const std::string& key, const CompiledInvokeStub* compiled_invoke_stub)
       LOCKS_EXCLUDED(compiled_invoke_stubs_lock_);
 
-#if defined(ART_USE_LLVM_COMPILER)
   void InsertProxyStub(const char* shorty, const CompiledInvokeStub* compiled_proxy_stub);
-#endif
 
   std::vector<const PatchInformation*> code_to_patch_;
   std::vector<const PatchInformation*> methods_to_patch_;
 
+  CompilerBackend compiler_backend_;
+
   InstructionSet instruction_set_;
 
   typedef SafeMap<const ClassReference, CompiledClass*> ClassTable;
@@ -322,12 +327,10 @@
   mutable Mutex compiled_invoke_stubs_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
   InvokeStubTable compiled_invoke_stubs_ GUARDED_BY(compiled_invoke_stubs_lock_);
 
-#if defined(ART_USE_LLVM_COMPILER)
   typedef SafeMap<std::string, const CompiledInvokeStub*> ProxyStubTable;
   // Proxy stubs created for proxy invocation delegation
   mutable Mutex compiled_proxy_stubs_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
   ProxyStubTable compiled_proxy_stubs_ GUARDED_BY(compiled_proxy_stubs_lock_);
-#endif
 
   bool image_;
   size_t thread_count_;
@@ -341,10 +344,8 @@
 
   const std::set<std::string>* image_classes_;
 
-#if defined(ART_USE_LLVM_COMPILER)
   typedef void (*CompilerCallbackFn)(Compiler& compiler);
   typedef MutexLock* (*CompilerMutexLockFn)(Compiler& compiler);
-#endif
 
   void* compiler_library_;
 
@@ -367,7 +368,6 @@
 
   pthread_key_t tls_key_;
 
-#if defined(ART_USE_LLVM_COMPILER)
   typedef CompiledInvokeStub* (*CreateProxyStubFn)
       (Compiler& compiler, const char* shorty, uint32_t shorty_len);
   CreateProxyStubFn create_proxy_stub_;
@@ -382,7 +382,6 @@
   typedef const AbstractMethod::InvokeStub* (*CompilerGetMethodInvokeStubAddrFn)
       (const Compiler& compiler, const CompiledInvokeStub* cm, const AbstractMethod* method);
   CompilerGetMethodInvokeStubAddrFn compiler_get_method_invoke_stub_addr_;
-#endif
 
 
   DISALLOW_COPY_AND_ASSIGN(Compiler);
diff --git a/src/compiler/Compiler.h b/src/compiler/Compiler.h
index 7eb32c2..11214cf 100644
--- a/src/compiler/Compiler.h
+++ b/src/compiler/Compiler.h
@@ -20,20 +20,16 @@
 #include "dex_file.h"
 #include "dex_instruction.h"
 
-#if defined(ART_USE_QUICK_COMPILER)
 namespace llvm {
   class Module;
   class LLVMContext;
 }
-#endif
 
 namespace art {
-#if defined(ART_USE_QUICK_COMPILER)
 namespace greenland {
   class IntrinsicHelper;
   class IRBuilder;
 }
-#endif
 
 #define COMPILER_TRACED(X)
 #define COMPILER_TRACEE(X)
@@ -141,10 +137,8 @@
   kDebugShowNops,
   kDebugCountOpcodes,
   kDebugDumpCheckStats,
-#if defined(ART_USE_QUICK_COMPILER)
   kDebugDumpBitcodeFile,
   kDebugVerifyBitcode,
-#endif
 };
 
 enum OatMethodAttributes {
@@ -177,7 +171,6 @@
   kReversePostOrderTraversal, // Depth-First-Search / reverse Post-Order
 };
 
-#if defined(ART_USE_QUICK_COMPILER)
 class LLVMInfo {
   public:
     LLVMInfo();
@@ -205,7 +198,6 @@
     UniquePtr<art::greenland::IntrinsicHelper> intrinsic_helper_;
     UniquePtr<art::greenland::IRBuilder> ir_builder_;
 };
-#endif
 
 struct CompilationUnit;
 struct BasicBlock;
diff --git a/src/compiler/CompilerIR.h b/src/compiler/CompilerIR.h
index 5a10831..d08af07 100644
--- a/src/compiler/CompilerIR.h
+++ b/src/compiler/CompilerIR.h
@@ -23,10 +23,8 @@
 #include "CompilerUtility.h"
 #include "oat_compilation_unit.h"
 #include "safe_map.h"
-#if defined(ART_USE_QUICK_COMPILER)
 #include "greenland/ir_builder.h"
 #include "llvm/Module.h"
-#endif
 
 namespace art {
 
@@ -262,9 +260,7 @@
   bool catchEntry;
   bool explicitThrow;
   bool conditionalBranch;
-#if defined(ART_USE_QUICK_COMPILER)
   bool hasReturn;
-#endif
   uint16_t startOffset;
   uint16_t nestingDepth;
   BBType blockType;
@@ -384,7 +380,6 @@
       numArenaBlocks(0),
       mstats(NULL),
       checkstats(NULL),
-#if defined(ART_USE_QUICK_COMPILER)
       genBitcode(false),
       context(NULL),
       module(NULL),
@@ -397,7 +392,6 @@
       tempName(0),
       numShadowFrameEntries(0),
       shadowMap(NULL),
-#endif
 #ifndef NDEBUG
       liveSReg(0),
 #endif
@@ -547,7 +541,6 @@
   int numArenaBlocks;
   Memstats* mstats;
   Checkstats* checkstats;
-#if defined(ART_USE_QUICK_COMPILER)
   bool genBitcode;
   LLVMInfo* llvm_info;
   llvm::LLVMContext* context;
@@ -567,7 +560,6 @@
   int numShadowFrameEntries;
   int* shadowMap;
   std::set<llvm::BasicBlock*> llvmBlocks;
-#endif
 #ifndef NDEBUG
   /*
    * Sanity checking for the register temp tracking.  The same ssa
diff --git a/src/compiler/Dataflow.cc b/src/compiler/Dataflow.cc
index 0058575..c59b637 100644
--- a/src/compiler/Dataflow.cc
+++ b/src/compiler/Dataflow.cc
@@ -1854,12 +1854,10 @@
       case Instruction::CMPG_FLOAT:
       case Instruction::CMPG_DOUBLE:
       case Instruction::CMP_LONG:
-#if defined(ART_USE_QUICK_COMPILER)
         if (cUnit->genBitcode) {
           // Bitcode doesn't allow this optimization.
           break;
         }
-#endif
         if (mir->next != NULL) {
           MIR* mirNext = mir->next;
           Instruction::Code brOpcode = mirNext->dalvikInsn.opcode;
diff --git a/src/compiler/Frontend.cc b/src/compiler/Frontend.cc
index c19751d..c5d5c21 100644
--- a/src/compiler/Frontend.cc
+++ b/src/compiler/Frontend.cc
@@ -21,7 +21,6 @@
 #include "object.h"
 #include "runtime.h"
 
-#if defined(ART_USE_QUICK_COMPILER)
 #include <llvm/Support/Threading.h>
 
 namespace {
@@ -32,11 +31,9 @@
     llvm::llvm_start_multithreaded();
   }
 }
-#endif
 
 namespace art {
 
-#if defined(ART_USE_QUICK_COMPILER)
 LLVMInfo::LLVMInfo() {
 #if !defined(ART_USE_LLVM_COMPILER)
   pthread_once(&llvm_multi_init, InitializeLLVMForQuick);
@@ -62,7 +59,6 @@
   delete reinterpret_cast<LLVMInfo*>(compiler.GetCompilerContext());
   compiler.SetCompilerContext(NULL);
 }
-#endif
 
 /* Default optimizer/debug setting for the compiler. */
 static uint32_t kCompilerOptimizerDisableFlags = 0 | // Disable specific optimizations
@@ -94,10 +90,8 @@
   //(1 << kDebugShowNops) |
   //(1 << kDebugCountOpcodes) |
   //(1 << kDebugDumpCheckStats) |
-#if defined(ART_USE_QUICK_COMPILER)
   //(1 << kDebugDumpBitcodeFile) |
   //(1 << kDebugVerifyBitcode) |
-#endif
   0;
 
 inline bool contentIsInsn(const u2* codePtr) {
@@ -788,14 +782,12 @@
 }
 
 CompiledMethod* compileMethod(Compiler& compiler,
+                              const CompilerBackend compilerBackend,
                               const DexFile::CodeItem* code_item,
                               uint32_t access_flags, InvokeType invoke_type,
                               uint32_t method_idx, jobject class_loader,
-                              const DexFile& dex_file
-#if defined(ART_USE_QUICK_COMPILER)
-                              , LLVMInfo* llvm_info,
-                              bool gbcOnly
-#endif
+                              const DexFile& dex_file,
+                              LLVMInfo* llvm_info
                              )
 {
   VLOG(compiler) << "Compiling " << PrettyMethod(method_idx, dex_file) << "...";
@@ -824,16 +816,18 @@
   cUnit->numIns = code_item->ins_size_;
   cUnit->numRegs = code_item->registers_size_ - cUnit->numIns;
   cUnit->numOuts = code_item->outs_size_;
-#if defined(ART_USE_QUICK_COMPILER)
   DCHECK((cUnit->instructionSet == kThumb2) ||
          (cUnit->instructionSet == kX86) ||
          (cUnit->instructionSet == kMips));
-  cUnit->llvm_info = llvm_info;
-  if (cUnit->instructionSet == kThumb2) {
-    // TODO: remove this once x86 is tested
+  if ((compilerBackend == kQuickGBC) || (compilerBackend == kPortable)) {
     cUnit->genBitcode = true;
   }
-#endif
+  DCHECK_NE(compilerBackend, kIceland);  // TODO: remove when Portable/Iceland merge complete
+  // TODO: remove this once x86 is tested
+  if (cUnit->genBitcode && (cUnit->instructionSet != kThumb2)) {
+    UNIMPLEMENTED(WARNING) << "GBC generation untested for non-Thumb targets";
+  }
+  cUnit->llvm_info = llvm_info;
   /* Adjust this value accordingly once inlining is performed */
   cUnit->numDalvikRegisters = code_item->registers_size_;
   // TODO: set this from command line
@@ -848,13 +842,9 @@
     cUnit->printMe = VLOG_IS_ON(compiler) ||
         (cUnit->enableDebug & (1 << kDebugVerbose));
   }
-#if defined(ART_USE_QUICK_COMPILER)
-  if (cUnit->genBitcode) {
 #ifndef NDEBUG
+  if (cUnit->genBitcode) {
     cUnit->enableDebug |= (1 << kDebugVerifyBitcode);
-#endif
-    //cUnit->printMe = true;
-    //cUnit->enableDebug |= (1 << kDebugDumpBitcodeFile);
   }
 #endif
 
@@ -1098,21 +1088,14 @@
   }
 
   if (cUnit->qdMode) {
-#if !defined(ART_USE_QUICK_COMPILER)
     // Bitcode generation requires full dataflow analysis
-    cUnit->disableDataflow = true;
-#endif
+    cUnit->disableDataflow = !cUnit->genBitcode;
     // Disable optimization which require dataflow/ssa
-    cUnit->disableOpt |=
-#if !defined(ART_USE_QUICK_COMPILER)
-        (1 << kNullCheckElimination) |
-#endif
-        (1 << kBBOpt) |
-        (1 << kPromoteRegs);
+    cUnit->disableOpt |= (1 << kBBOpt) | (1 << kPromoteRegs) | (1 << kNullCheckElimination);
     if (cUnit->printMe) {
         LOG(INFO) << "QD mode enabled: "
                   << PrettyMethod(method_idx, dex_file)
-                  << " too big: " << cUnit->numBlocks;
+                  << " num blocks: " << cUnit->numBlocks;
     }
   }
 
@@ -1168,12 +1151,11 @@
   /* Allocate Registers using simple local allocation scheme */
   oatSimpleRegAlloc(cUnit.get());
 
-#if defined(ART_USE_QUICK_COMPILER)
   /* Go the LLVM path? */
   if (cUnit->genBitcode) {
     // MIR->Bitcode
     oatMethodMIR2Bitcode(cUnit.get());
-    if (gbcOnly) {
+    if (compilerBackend == kPortable) {
       // all done
       oatArenaReset(cUnit.get());
       return NULL;
@@ -1181,7 +1163,6 @@
     // Bitcode->LIR
     oatMethodBitcode2LIR(cUnit.get());
   } else {
-#endif
     if (specialCase != kNoHandler) {
       /*
        * Custom codegen for special cases.  If for any reason the
@@ -1195,9 +1176,7 @@
     if (cUnit->firstLIRInsn == NULL) {
       oatMethodMIR2LIR(cUnit.get());
     }
-#if defined(ART_USE_QUICK_COMPILER)
   }
-#endif
 
   // Debugging only
   if (cUnit->enableDebug & (1 << kDebugDumpCFG)) {
@@ -1268,55 +1247,30 @@
   return result;
 }
 
-#if defined(ART_USE_QUICK_COMPILER)
 CompiledMethod* oatCompileMethod(Compiler& compiler,
+                                 const CompilerBackend backend,
                                  const DexFile::CodeItem* code_item,
                                  uint32_t access_flags, InvokeType invoke_type,
                                  uint32_t method_idx, jobject class_loader,
-                                 const DexFile& dex_file)
+                                 const DexFile& dex_file,
+                                 LLVMInfo* llvmInfo)
 {
-  return compileMethod(compiler, code_item, access_flags, invoke_type, method_idx, class_loader,
-                       dex_file, NULL, false);
+  return compileMethod(compiler, backend, code_item, access_flags, invoke_type, method_idx, class_loader,
+                       dex_file, llvmInfo);
 }
 
-/*
- * Given existing llvm module, context, intrinsic_helper and IRBuilder,
- * add the bitcode for the method described by code_item to the module.
- */
-void oatCompileMethodToGBC(Compiler& compiler,
-                           const DexFile::CodeItem* code_item,
-                           uint32_t access_flags, InvokeType invoke_type,
-                           uint32_t method_idx, jobject class_loader,
-                           const DexFile& dex_file,
-                           LLVMInfo* llvm_info)
-{
-  compileMethod(compiler, code_item, access_flags, invoke_type, method_idx, class_loader,
-                dex_file, llvm_info, true);
-}
-#else
-CompiledMethod* oatCompileMethod(Compiler& compiler,
-                                 const DexFile::CodeItem* code_item,
-                                 uint32_t access_flags, InvokeType invoke_type,
-                                 uint32_t method_idx, jobject class_loader,
-                                 const DexFile& dex_file)
-{
-  return compileMethod(compiler, code_item, access_flags, invoke_type, method_idx, class_loader,
-                       dex_file);
-}
-#endif
-
 }  // namespace art
 
-#if !defined(ART_USE_LLVM_COMPILER)
 extern "C" art::CompiledMethod*
-    ArtCompileMethod(art::Compiler& compiler,
-                     const art::DexFile::CodeItem* code_item,
-                     uint32_t access_flags, art::InvokeType invoke_type,
-                     uint32_t method_idx, jobject class_loader,
-                     const art::DexFile& dex_file)
+    ArtQuickCompileMethod(art::Compiler& compiler,
+                          const art::DexFile::CodeItem* code_item,
+                          uint32_t access_flags, art::InvokeType invoke_type,
+                          uint32_t method_idx, jobject class_loader,
+                          const art::DexFile& dex_file)
 {
   CHECK_EQ(compiler.GetInstructionSet(), art::oatInstructionSet());
-  return art::oatCompileMethod(compiler, code_item, access_flags, invoke_type,
-                               method_idx, class_loader, dex_file);
+  // TODO: check method fingerprint here to determine appropriate backend type.  Until then, use build default
+  art::CompilerBackend backend = compiler.GetCompilerBackend();
+  return art::oatCompileMethod(compiler, backend, code_item, access_flags, invoke_type,
+                               method_idx, class_loader, dex_file, NULL /* use thread llvmInfo */);
 }
-#endif
diff --git a/src/compiler/Ralloc.cc b/src/compiler/Ralloc.cc
index bf69ce4..ca25b38 100644
--- a/src/compiler/Ralloc.cc
+++ b/src/compiler/Ralloc.cc
@@ -485,19 +485,12 @@
       }
   }
 
-#if defined(ART_USE_QUICK_COMPILER)
   if (!cUnit->genBitcode) {
     /* Remap names */
     oatDataFlowAnalysisDispatcher(cUnit, remapNames,
                                   kPreOrderDFSTraversal,
                                   false /* isIterative */);
   }
-#else
-  /* Remap names */
-  oatDataFlowAnalysisDispatcher(cUnit, remapNames,
-                                kPreOrderDFSTraversal,
-                                false /* isIterative */);
-#endif
 
   /* Do type & size inference pass */
   oatDataFlowAnalysisDispatcher(cUnit, inferTypeAndSize,
diff --git a/src/compiler/codegen/MethodBitcode.cc b/src/compiler/codegen/MethodBitcode.cc
index cf07ea4..7920883 100644
--- a/src/compiler/codegen/MethodBitcode.cc
+++ b/src/compiler/codegen/MethodBitcode.cc
@@ -14,7 +14,6 @@
  * limitations under the License.
  */
 
-#if defined(ART_USE_QUICK_COMPILER)
 #include "object_utils.h"
 
 #include <llvm/Support/ToolOutputFile.h>
@@ -3537,5 +3536,3 @@
 
 
 }  // namespace art
-
-#endif  // ART_USE_QUICK_COMPILER
diff --git a/src/compiler_llvm/compilation_unit.cc b/src/compiler_llvm/compilation_unit.cc
index ba71aee..a27ea6e 100644
--- a/src/compiler_llvm/compilation_unit.cc
+++ b/src/compiler_llvm/compilation_unit.cc
@@ -154,7 +154,7 @@
 llvm::FunctionPass*
 CreateGBCExpanderPass(const greenland::IntrinsicHelper& intrinsic_helper,
                       IRBuilder& irb);
-#elif defined(ART_USE_QUICK_COMPILER)
+#elif defined(ART_USE_PORTABLE_COMPILER)
 llvm::FunctionPass*
 CreateGBCExpanderPass(const greenland::IntrinsicHelper& intrinsic_helper, IRBuilder& irb,
                       Compiler* compiler, OatCompilationUnit* oat_compilation_unit);
@@ -166,7 +166,7 @@
 CompilationUnit::CompilationUnit(const CompilerLLVM* compiler_llvm,
                                  size_t cunit_idx)
 : compiler_llvm_(compiler_llvm), cunit_idx_(cunit_idx) {
-#if !defined(ART_USE_QUICK_COMPILER)
+#if !defined(ART_USE_PORTABLE_COMPILER)
   context_.reset(new llvm::LLVMContext());
   module_ = new llvm::Module("art", *context_);
 #else
@@ -210,7 +210,7 @@
 CompilationUnit::~CompilationUnit() {
 #if defined(ART_USE_DEXLANG_FRONTEND)
   delete dex_lang_ctx_;
-#elif defined(ART_USE_QUICK_COMPILER)
+#elif defined(ART_USE_PORTABLE_COMPILER)
   llvm::LLVMContext* llvm_context = context_.release(); // Managed by llvm_info_
   CHECK(llvm_context != NULL);
 #endif
@@ -330,7 +330,7 @@
     // regular FunctionPass.
 #if defined(ART_USE_DEXLANG_FRONTEND)
     fpm.add(CreateGBCExpanderPass(dex_lang_ctx_->GetIntrinsicHelper(), *irb_.get()));
-#elif defined(ART_USE_QUICK_COMPILER)
+#elif defined(ART_USE_PORTABLE_COMPILER)
     fpm.add(CreateGBCExpanderPass(*llvm_info_->GetIntrinsicHelper(), *irb_.get(),
                                   compiler_, oat_compilation_unit_));
 #endif
@@ -340,7 +340,7 @@
     llvm::FunctionPassManager fpm2(module_);
 #if defined(ART_USE_DEXLANG_FRONTEND)
     fpm2.add(CreateGBCExpanderPass(dex_lang_ctx_->GetIntrinsicHelper(), *irb_.get()));
-#elif defined(ART_USE_QUICK_COMPILER)
+#elif defined(ART_USE_PORTABLE_COMPILER)
     fpm2.add(CreateGBCExpanderPass(*llvm_info_->GetIntrinsicHelper(), *irb_.get(),
                                    compiler_, oat_compilation_unit_));
 #endif
diff --git a/src/compiler_llvm/compilation_unit.h b/src/compiler_llvm/compilation_unit.h
index 6ad7ee1..0b40388 100644
--- a/src/compiler_llvm/compilation_unit.h
+++ b/src/compiler_llvm/compilation_unit.h
@@ -28,7 +28,7 @@
 #include "runtime_support_func.h"
 #include "safe_map.h"
 
-#if defined(ART_USE_QUICK_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
 # include "compiler/Dalvik.h"
 # include "compiler.h"
 # include "oat_compilation_unit.h"
@@ -90,7 +90,7 @@
     bitcode_filename_ = bitcode_filename;
   }
 
-#if defined(ART_USE_QUICK_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
   LLVMInfo* GetQuickContext() const {
     return llvm_info_.get();
   }
@@ -124,7 +124,7 @@
 #if defined(ART_USE_DEXLANG_FRONTEND)
   greenland::DexLang::Context* dex_lang_ctx_;
 #endif
-#if defined(ART_USE_QUICK_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
   UniquePtr<LLVMInfo> llvm_info_;
   Compiler* compiler_;
   OatCompilationUnit* oat_compilation_unit_;
diff --git a/src/compiler_llvm/compiler_llvm.cc b/src/compiler_llvm/compiler_llvm.cc
index a964b40..aa5ec82 100644
--- a/src/compiler_llvm/compiler_llvm.cc
+++ b/src/compiler_llvm/compiler_llvm.cc
@@ -38,14 +38,15 @@
 #include <llvm/Support/TargetSelect.h>
 #include <llvm/Support/Threading.h>
 
-#if defined(ART_USE_QUICK_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
 namespace art {
-void oatCompileMethodToGBC(Compiler& compiler,
-                           const DexFile::CodeItem* code_item,
-                           uint32_t access_flags, InvokeType invoke_type,
-                           uint32_t method_idx, jobject class_loader,
-                           const DexFile& dex_file,
-                           LLVMInfo* llvm_info);
+void oatCompileMethod(Compiler& compiler,
+                      const CompilerBackend compilerBackend,
+                      const DexFile::CodeItem* code_item,
+                      uint32_t access_flags, InvokeType invoke_type,
+                      uint32_t method_idx, jobject class_loader,
+                      const DexFile& dex_file,
+                      LLVMInfo* llvm_info);
 }
 #endif
 
@@ -152,7 +153,7 @@
 
   return new CompiledMethod(cunit->GetInstructionSet(),
                             cunit->GetCompiledCode());
-#elif defined(ART_USE_QUICK_COMPILER)
+#elif defined(ART_USE_PORTABLE_COMPILER)
   std::string methodName(PrettyMethod(oat_compilation_unit->GetDexMethodIndex(),
                                       *oat_compilation_unit->GetDexFile()));
   if (insn_set_ == kX86) {
@@ -162,16 +163,17 @@
 
     return method_compiler->Compile();
   } else {
-    // Use quick
-    oatCompileMethodToGBC(*compiler_,
-                          oat_compilation_unit->GetCodeItem(),
-                          oat_compilation_unit->access_flags_,
-                          invoke_type,
-                          oat_compilation_unit->GetDexMethodIndex(),
-                          oat_compilation_unit->GetClassLoader(),
-                          *oat_compilation_unit->GetDexFile(),
-                          cunit->GetQuickContext()
-                          );
+    // TODO: consolidate ArtCompileMethods
+    oatCompileMethod(*compiler_,
+                     kPortable,
+                     oat_compilation_unit->GetCodeItem(),
+                     oat_compilation_unit->access_flags_,
+                     invoke_type,
+                     oat_compilation_unit->GetDexMethodIndex(),
+                     oat_compilation_unit->GetClassLoader(),
+                     *oat_compilation_unit->GetDexFile(),
+                     cunit->GetQuickContext()
+                     );
 
     cunit->SetCompiler(compiler_);
     cunit->SetOatCompilationUnit(oat_compilation_unit);
diff --git a/src/compiler_llvm/compiler_llvm.h b/src/compiler_llvm/compiler_llvm.h
index 39223ef..0867e56 100644
--- a/src/compiler_llvm/compiler_llvm.h
+++ b/src/compiler_llvm/compiler_llvm.h
@@ -77,7 +77,7 @@
   CompiledMethod* CompileDexMethod(OatCompilationUnit* oat_compilation_unit,
                                    InvokeType invoke_type);
 
-#if defined(ART_USE_LLVM_COMPILER) && defined(ART_USE_QUICK_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
   CompiledMethod* CompileGBCMethod(OatCompilationUnit* oat_compilation_unit, std::string* func);
 #endif
 
diff --git a/src/compiler_llvm/gbc_expander.cc b/src/compiler_llvm/gbc_expander.cc
index 484dd77..18cef41 100644
--- a/src/compiler_llvm/gbc_expander.cc
+++ b/src/compiler_llvm/gbc_expander.cc
@@ -370,7 +370,7 @@
   func_ = &func;
   changed_ = false; // Assume unchanged
 
-#if defined(ART_USE_QUICK_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
   basic_blocks_.resize(code_item_->insns_size_in_code_units_);
   basic_block_landing_pads_.resize(code_item_->tries_size_, NULL);
   basic_block_unwind_ = NULL;
@@ -1032,7 +1032,7 @@
                                             bool is_div, JType op_jty) {
   llvm::Value* dividend = call_inst.getArgOperand(0);
   llvm::Value* divisor = call_inst.getArgOperand(1);
-#if defined(ART_USE_QUICK_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
   uint32_t dex_pc = LV2UInt(call_inst.getMetadata("DexOff")->getOperand(0));
   EmitGuard_DivZeroException(dex_pc, divisor, op_jty);
 #endif
@@ -1145,7 +1145,7 @@
   };
 
   llvm::Value* entry_addr = irb_.CreateGEP(shadow_frame_, gep_index);
-#if defined(ART_USE_QUICK_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
   if (obj->getType() != irb_.getJObjectTy()) {
     obj = irb_.getJNull();
   }
@@ -1155,7 +1155,7 @@
 }
 
 void GBCExpanderPass::Expand_PopShadowFrame() {
-#if defined(ART_USE_QUICK_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
   if (old_shadow_frame_ == NULL) {
     return;
   }
@@ -1191,7 +1191,7 @@
   // alloca instructions)
   EmitStackOverflowCheck(&*first_non_alloca);
 
-#if defined(ART_USE_QUICK_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
   irb_.Runtime().EmitTestSuspend();
 #endif
 
@@ -2385,7 +2385,7 @@
 }
 
 void GBCExpanderPass::EmitUpdateDexPC(uint32_t dex_pc) {
-#if defined(ART_USE_QUICK_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
   if (shadow_frame_ == NULL) {
     return;
   }
@@ -2477,7 +2477,7 @@
   // Get return type
 
   char ret_shorty = shorty[0];
-#if defined(ART_USE_QUICK_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
   ret_shorty = art::remapShorty(ret_shorty);
 #endif
   llvm::Type* ret_type = irb_.getJType(ret_shorty, kAccurate);
@@ -2492,7 +2492,7 @@
   }
 
   for (uint32_t i = 1; i < shorty_size; ++i) {
-#if defined(ART_USE_QUICK_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
     char shorty_type = art::remapShorty(shorty[i]);
     args_type.push_back(irb_.getJType(shorty_type, kAccurate));
 #else
@@ -2627,7 +2627,7 @@
 
   // Emit the code to return default value (zero) for the given return type.
   char ret_shorty = oat_compilation_unit_->GetShorty()[0];
-#if defined(ART_USE_QUICK_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
   ret_shorty = art::remapShorty(ret_shorty);
 #endif
   if (ret_shorty == 'V') {
diff --git a/src/compiler_llvm/stub_compiler.cc b/src/compiler_llvm/stub_compiler.cc
index 3ac5f2a..4854c9f 100644
--- a/src/compiler_llvm/stub_compiler.cc
+++ b/src/compiler_llvm/stub_compiler.cc
@@ -151,7 +151,7 @@
   llvm::Value* code_addr = irb_.CreateLoad(code_field_addr, kTBAAJRuntime);
 
   llvm::CallInst* retval = irb_.CreateCall(code_addr, args);
-#if defined(ART_USE_QUICK_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
   for (size_t i = 1; i < shorty_size; ++i) {
     switch(shorty[i]) {
       case 'Z':
@@ -216,7 +216,7 @@
   llvm::Function* func =
     llvm::Function::Create(accurate_func_type, llvm::Function::ExternalLinkage,
                            func_name, module_);
-#if defined(ART_USE_QUICK_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
   switch(shorty[0]) {
     case 'Z':
     case 'C':
diff --git a/src/dex2oat.cc b/src/dex2oat.cc
index 20872e1..a8f42af 100644
--- a/src/dex2oat.cc
+++ b/src/dex2oat.cc
@@ -83,11 +83,9 @@
   UsageError("      to the file descriptor specified by --oat-fd.");
   UsageError("      Example: --oat-location=/data/art-cache/system@app@Calculator.apk.oat");
   UsageError("");
-#if defined(ART_USE_LLVM_COMPILER)
   UsageError("  --bitcode=<file.bc>: specifies the optional bitcode filename.");
   UsageError("      Example: --bitcode=/system/framework/boot.bc");
   UsageError("");
-#endif
   UsageError("  --image=<file.art>: specifies the output image filename.");
   UsageError("      Example: --image=/system/framework/boot.art");
   UsageError("");
@@ -111,6 +109,10 @@
   UsageError("      Example: --instruction-set=x86");
   UsageError("      Default: arm");
   UsageError("");
+  UsageError("  --compiler-backend=(Quick|QuickGBC|Portable): select compiler backend");
+  UsageError("      set.");
+  UsageError("      Example: --instruction-set=Portable");
+  UsageError("      Default: Quick");
   UsageError("  --runtime-arg <argument>: used to specify various arguments for the runtime,");
   UsageError("      such as initial heap size, maximum heap size, and verbose output.");
   UsageError("      Use a separate --runtime-arg switch for each argument.");
@@ -122,14 +124,15 @@
 
 class Dex2Oat {
  public:
-  static bool Create(Dex2Oat** p_dex2oat, Runtime::Options& options, InstructionSet instruction_set,
-                         size_t thread_count, bool support_debugging)
+  static bool Create(Dex2Oat** p_dex2oat, Runtime::Options& options, CompilerBackend compiler_backend,
+                     InstructionSet instruction_set, size_t thread_count, bool support_debugging)
       SHARED_TRYLOCK_FUNCTION(true, Locks::mutator_lock_) {
     if (!CreateRuntime(options, instruction_set)) {
       *p_dex2oat = NULL;
       return false;
     }
-    *p_dex2oat = new Dex2Oat(Runtime::Current(), instruction_set, thread_count, support_debugging);
+    *p_dex2oat = new Dex2Oat(Runtime::Current(), compiler_backend, instruction_set, thread_count,
+                             support_debugging);
     return true;
   }
 
@@ -209,9 +212,7 @@
                                 const std::string* host_prefix,
                                 const std::vector<const DexFile*>& dex_files,
                                 File* oat_file,
-#if defined(ART_USE_LLVM_COMPILER)
                                 const std::string& bitcode_filename,
-#endif
                                 bool image,
                                 const std::set<std::string>* image_classes,
                                 bool dump_stats,
@@ -234,7 +235,8 @@
       Runtime::Current()->SetCompileTimeClassPath(class_loader, class_path_files);
     }
 
-    UniquePtr<Compiler> compiler(new Compiler(instruction_set_,
+    UniquePtr<Compiler> compiler(new Compiler(compiler_backend_,
+                                              instruction_set_,
                                               image,
                                               thread_count_,
                                               support_debugging_,
@@ -242,9 +244,9 @@
                                               dump_stats,
                                               dump_timings));
 
-#if defined(ART_USE_LLVM_COMPILER)
-    compiler->SetBitcodeFileName(bitcode_filename);
-#endif
+    if ((compiler_backend_ == kPortable) || (compiler_backend_ == kIceland)) {
+      compiler->SetBitcodeFileName(bitcode_filename);
+    }
 
     Thread::Current()->TransitionFromRunnableToSuspended(kNative);
 
@@ -295,9 +297,10 @@
   }
 
  private:
-  explicit Dex2Oat(Runtime* runtime, InstructionSet instruction_set, size_t thread_count,
-                   bool support_debugging)
-      : instruction_set_(instruction_set),
+  explicit Dex2Oat(Runtime* runtime, CompilerBackend compiler_backend, InstructionSet instruction_set,
+                   size_t thread_count, bool support_debugging)
+      : compiler_backend_(compiler_backend),
+        instruction_set_(instruction_set),
         runtime_(runtime),
         thread_count_(thread_count),
         support_debugging_(support_debugging),
@@ -431,6 +434,8 @@
     return false;
   }
 
+  const CompilerBackend compiler_backend_;
+
   const InstructionSet instruction_set_;
 
   Runtime* runtime_;
@@ -487,9 +492,7 @@
   std::string oat_filename;
   std::string oat_location;
   int oat_fd = -1;
-#if defined(ART_USE_LLVM_COMPILER)
   std::string bitcode_filename;
-#endif
   const char* image_classes_filename = NULL;
   std::string image_filename;
   std::string boot_image_filename;
@@ -498,6 +501,13 @@
   std::vector<const char*> runtime_args;
   int thread_count = sysconf(_SC_NPROCESSORS_CONF);
   bool support_debugging = false;
+#if defined(ART_USE_PORTABLE_COMPILER)
+  CompilerBackend compiler_backend = kPortable;
+#elif defined(ART_USE_LLVM_COMPILER)
+  CompilerBackend compiler_backend = kIceland;
+#else
+  CompilerBackend compiler_backend = kQuick;
+#endif
 #if defined(__arm__)
   InstructionSet instruction_set = kThumb2;
 #elif defined(__i386__)
@@ -543,10 +553,8 @@
       }
     } else if (option.starts_with("--oat-location=")) {
       oat_location = option.substr(strlen("--oat-location=")).data();
-#if defined(ART_USE_LLVM_COMPILER)
     } else if (option.starts_with("--bitcode=")) {
       bitcode_filename = option.substr(strlen("--bitcode=")).data();
-#endif
     } else if (option.starts_with("--image=")) {
       image_filename = option.substr(strlen("--image=")).data();
     } else if (option.starts_with("--image-classes=")) {
@@ -571,6 +579,18 @@
       } else if (instruction_set_str == "x86") {
         instruction_set = kX86;
       }
+    } else if (option.starts_with("--compiler-backend=")) {
+      StringPiece backend_str = option.substr(strlen("--compiler-backend=")).data();
+      if (backend_str == "Quick") {
+        compiler_backend = kQuick;
+      } else if (backend_str == "QuickGBC") {
+        compiler_backend = kQuickGBC;
+      } else if (backend_str == "Iceland") {
+        // TODO: remove this when Portable/Iceland merge complete
+        compiler_backend = kIceland;
+      } else if (backend_str == "Portable") {
+        compiler_backend = kPortable;
+      }
     } else if (option == "--runtime-arg") {
       if (++i >= argc) {
         Usage("Missing required argument for --runtime-arg");
@@ -704,7 +724,7 @@
   }
 
   Dex2Oat* p_dex2oat;
-  if (!Dex2Oat::Create(&p_dex2oat, options, instruction_set, thread_count, support_debugging)) {
+  if (!Dex2Oat::Create(&p_dex2oat, options, compiler_backend, instruction_set, thread_count, support_debugging)) {
     LOG(ERROR) << "Failed to create dex2oat";
     return EXIT_FAILURE;
   }
@@ -755,9 +775,7 @@
                                                             host_prefix.get(),
                                                             dex_files,
                                                             oat_file.get(),
-#if defined(ART_USE_LLVM_COMPILER)
                                                             bitcode_filename,
-#endif
                                                             image,
                                                             image_classes.get(),
                                                             dump_stats,
diff --git a/src/greenland/ir_builder.h b/src/greenland/ir_builder.h
index baa0ae7..ba8e5e1 100644
--- a/src/greenland/ir_builder.h
+++ b/src/greenland/ir_builder.h
@@ -33,7 +33,6 @@
 namespace art {
 namespace greenland {
 
-#if defined(ART_USE_QUICK_COMPILER)
 class InserterWithDexOffset
    : public llvm::IRBuilderDefaultInserter<true> {
   public:
@@ -54,9 +53,6 @@
 };
 
 typedef llvm::IRBuilder<true, llvm::NoFolder, InserterWithDexOffset> LLVMIRBuilder;
-#else
-typedef llvm::IRBuilder<true> LLVMIRBuilder;
-#endif
 
 class IRBuilder : public LLVMIRBuilder {
  public:
diff --git a/src/oat_file.cc b/src/oat_file.cc
index 4e05325..145d2e2 100644
--- a/src/oat_file.cc
+++ b/src/oat_file.cc
@@ -70,11 +70,7 @@
 
 bool OatFile::Map(File& file,
                   byte* requested_base,
-#if defined(ART_USE_LLVM_COMPILER)
-                  RelocationBehavior reloc,
-#else
                   RelocationBehavior /*UNUSED*/,
-#endif
                   bool writable) {
   OatHeader oat_header;
   bool success = file.ReadFully(&oat_header, sizeof(oat_header));
diff --git a/src/oat_test.cc b/src/oat_test.cc
index 64c502d..bb6305a 100644
--- a/src/oat_test.cc
+++ b/src/oat_test.cc
@@ -65,7 +65,15 @@
 
   jobject class_loader = NULL;
   if (compile) {
-    compiler_.reset(new Compiler(kThumb2, false, 2, false, NULL, true, true));
+    // TODO: make selectable
+#if defined(ART_USE_PORTABLE_COMPILER)
+    CompilerBackend compiler_backend = kPortable;
+#elif defined(ART_USE_LLVM_COMPILER)
+    CompilerBackend compiler_backend = kIceland; // TODO: remove
+#else
+    CompilerBackend compiler_backend = kQuick;
+#endif
+    compiler_.reset(new Compiler(compiler_backend, kThumb2, false, 2, false, NULL, true, true));
     compiler_->CompileAll(class_loader, class_linker->GetBootClassPath());
   }
 
diff --git a/src/thread.cc b/src/thread.cc
index 67773a5..da6ae74 100644
--- a/src/thread.cc
+++ b/src/thread.cc
@@ -292,9 +292,6 @@
   SetUpAlternateSignalStack();
   InitCpu();
   InitFunctionPointers();
-#ifdef ART_USE_GREENLAND_COMPILER
-  InitRuntimeEntryPoints(&runtime_entry_points_);
-#endif
   InitCardTable();
   InitTid();
 
diff --git a/src/thread.h b/src/thread.h
index abfd719..a5f218a 100644
--- a/src/thread.h
+++ b/src/thread.h
@@ -35,9 +35,6 @@
 #include "stack_indirect_reference_table.h"
 #include "trace.h"
 #include "UniquePtr.h"
-#ifdef ART_USE_GREENLAND_COMPILER
-#include "greenland/runtime_entry_points.h"
-#endif
 
 namespace art {
 
@@ -782,9 +779,6 @@
   // Runtime support function pointers
   // TODO: move this near the top, since changing its offset requires all oats to be recompiled!
   EntryPoints entrypoints_;
-#ifdef ART_USE_GREENLAND_COMPILER
-  RuntimeEntryPoints runtime_entry_points_;
-#endif
 
  private:
   // How many times has our pthread key's destructor been called?
diff --git a/src/trace.cc b/src/trace.cc
index d0132e1..753b80f 100644
--- a/src/trace.cc
+++ b/src/trace.cc
@@ -241,6 +241,7 @@
 
 void Trace::SaveAndUpdateCode(AbstractMethod* method) {
 #if defined(ART_USE_LLVM_COMPILER)
+  UNUSED(method);
   UNIMPLEMENTED(FATAL);
 #else
   void* trace_stub = GetLogTraceEntryPoint();
diff --git a/src/verifier/method_verifier.cc b/src/verifier/method_verifier.cc
index 67507bc..bd77a3c 100644
--- a/src/verifier/method_verifier.cc
+++ b/src/verifier/method_verifier.cc
@@ -32,7 +32,7 @@
 #include "runtime.h"
 #include "stringpiece.h"
 
-#if defined(ART_USE_LLVM_COMPILER) || defined(ART_USE_GREENLAND_COMPILER)
+#if defined(ART_USE_LLVM_COMPILER)
 #include "greenland/backend_types.h"
 #include "greenland/inferred_reg_category_map.h"
 #endif
@@ -962,7 +962,7 @@
   return true;
 }
 
-#if !defined(ART_USE_LLVM_COMPILER) && !defined(ART_USE_GREENLAND_COMPILER)
+#if !defined(ART_USE_LLVM_COMPILER)
 static const std::vector<uint8_t>* CreateLengthPrefixedDexGcMap(const std::vector<uint8_t>& gc_map) {
   std::vector<uint8_t>* length_prefixed_gc_map = new std::vector<uint8_t>;
   length_prefixed_gc_map->push_back((gc_map.size() & 0xff000000) >> 24);
@@ -1012,7 +1012,7 @@
 
   Compiler::MethodReference ref(dex_file_, method_idx_);
 
-#if !defined(ART_USE_LLVM_COMPILER) && !defined(ART_USE_GREENLAND_COMPILER)
+#if !defined(ART_USE_LLVM_COMPILER)
 
   /* Generate a register map and add it to the method. */
   UniquePtr<const std::vector<uint8_t> > map(GenerateGcMap());
@@ -1026,7 +1026,7 @@
   const std::vector<uint8_t>* dex_gc_map = CreateLengthPrefixedDexGcMap(*(map.get()));
   verifier::MethodVerifier::SetDexGcMap(ref, *dex_gc_map);
 
-#else  // defined(ART_USE_LLVM_COMPILER) || defined(ART_USE_GREENLAND_COMPILER)
+#else  // defined(ART_USE_LLVM_COMPILER)
   /* Generate Inferred Register Category for LLVM-based Code Generator */
   const InferredRegCategoryMap* table = GenerateInferredRegCategoryMap();
   verifier::MethodVerifier::SetInferredRegCategoryMap(ref, *table);
@@ -3262,7 +3262,7 @@
 Mutex* MethodVerifier::rejected_classes_lock_ = NULL;
 MethodVerifier::RejectedClassesTable* MethodVerifier::rejected_classes_ = NULL;
 
-#if defined(ART_USE_LLVM_COMPILER) || defined(ART_USE_GREENLAND_COMPILER)
+#if defined(ART_USE_LLVM_COMPILER)
 Mutex* MethodVerifier::inferred_reg_category_maps_lock_ = NULL;
 MethodVerifier::InferredRegCategoryMapTable* MethodVerifier::inferred_reg_category_maps_ = NULL;
 #endif
@@ -3281,7 +3281,7 @@
     rejected_classes_ = new MethodVerifier::RejectedClassesTable;
   }
 
-#if defined(ART_USE_LLVM_COMPILER) || defined(ART_USE_GREENLAND_COMPILER)
+#if defined(ART_USE_LLVM_COMPILER)
   inferred_reg_category_maps_lock_ = new Mutex("verifier GC maps lock");
   {
     MutexLock mu(self, *inferred_reg_category_maps_lock_);
@@ -3309,7 +3309,7 @@
   delete rejected_classes_lock_;
   rejected_classes_lock_ = NULL;
 
-#if defined(ART_USE_LLVM_COMPILER) || defined(ART_USE_GREENLAND_COMPILER)
+#if defined(ART_USE_LLVM_COMPILER)
   {
     MutexLock mu(self, *inferred_reg_category_maps_lock_);
     STLDeleteValues(inferred_reg_category_maps_);
@@ -3334,7 +3334,7 @@
   return (rejected_classes_->find(ref) != rejected_classes_->end());
 }
 
-#if defined(ART_USE_LLVM_COMPILER) || defined(ART_USE_GREENLAND_COMPILER)
+#if defined(ART_USE_LLVM_COMPILER)
 const greenland::InferredRegCategoryMap* MethodVerifier::GenerateInferredRegCategoryMap() {
   uint32_t insns_size = code_item_->insns_size_in_code_units_;
   uint16_t regs_size = code_item_->registers_size_;
diff --git a/src/verifier/method_verifier.h b/src/verifier/method_verifier.h
index 6765c10..42283a2 100644
--- a/src/verifier/method_verifier.h
+++ b/src/verifier/method_verifier.h
@@ -39,7 +39,7 @@
 
 struct ReferenceMap2Visitor;
 
-#if defined(ART_USE_LLVM_COMPILER) || defined(ART_USE_GREENLAND_COMPILER)
+#if defined(ART_USE_LLVM_COMPILER)
 namespace greenland {
   class InferredRegCategoryMap;
 }  // namespace greenland
@@ -143,7 +143,7 @@
 
 // The verifier
 class MethodVerifier {
-#if defined(ART_USE_LLVM_COMPILER) || defined(ART_USE_GREENLAND_COMPILER)
+#if defined(ART_USE_LLVM_COMPILER)
   typedef greenland::InferredRegCategoryMap InferredRegCategoryMap;
 #endif
 
@@ -203,7 +203,7 @@
   static void Init();
   static void Shutdown();
 
-#if defined(ART_USE_LLVM_COMPILER) || defined(ART_USE_GREENLAND_COMPILER)
+#if defined(ART_USE_LLVM_COMPILER)
   static const InferredRegCategoryMap* GetInferredRegCategoryMap(Compiler::MethodReference ref)
       LOCKS_EXCLUDED(inferred_reg_category_maps_lock_);
 #endif
@@ -554,7 +554,7 @@
   // Get a type representing the declaring class of the method.
   const RegType& GetDeclaringClass() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
-#if defined(ART_USE_LLVM_COMPILER) || defined(ART_USE_GREENLAND_COMPILER)
+#if defined(ART_USE_LLVM_COMPILER)
   /*
    * Generate the inferred register category for LLVM-based code generator.
    * Returns a pointer to a two-dimension Class array, or NULL on failure.
@@ -589,7 +589,7 @@
   static Mutex* rejected_classes_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
   static RejectedClassesTable* rejected_classes_;
 
-#if defined(ART_USE_LLVM_COMPILER) || defined(ART_USE_GREENLAND_COMPILER)
+#if defined(ART_USE_LLVM_COMPILER)
   // All the inferred register category maps that the verifier has created.
   typedef SafeMap<const Compiler::MethodReference,
                   const InferredRegCategoryMap*> InferredRegCategoryMapTable;