diff --git a/build/Android.gtest.mk b/build/Android.gtest.mk
index bfc8956..ccea540 100644
--- a/build/Android.gtest.mk
+++ b/build/Android.gtest.mk
@@ -124,6 +124,7 @@
   runtime/arch/x86_64/instruction_set_features_x86_64_test.cc \
   runtime/barrier_test.cc \
   runtime/base/bit_field_test.cc \
+  runtime/base/bit_utils_test.cc \
   runtime/base/bit_vector_test.cc \
   runtime/base/hash_set_test.cc \
   runtime/base/hex_dump_test.cc \
@@ -131,6 +132,7 @@
   runtime/base/mutex_test.cc \
   runtime/base/scoped_flock_test.cc \
   runtime/base/stringprintf_test.cc \
+  runtime/base/time_utils_test.cc \
   runtime/base/timing_logger_test.cc \
   runtime/base/variant_map_test.cc \
   runtime/base/unix_file/fd_file_test.cc \
diff --git a/cmdline/cmdline_parser.h b/cmdline/cmdline_parser.h
index e4af4f9..cebba65 100644
--- a/cmdline/cmdline_parser.h
+++ b/cmdline/cmdline_parser.h
@@ -30,7 +30,6 @@
 #include "cmdline_parse_result.h"
 
 #include "runtime/base/variant_map.h"
-#include "utils.h"
 
 #include <vector>
 #include <memory>
diff --git a/cmdline/cmdline_types.h b/cmdline/cmdline_types.h
index e02fe4b..28bd754 100644
--- a/cmdline/cmdline_types.h
+++ b/cmdline/cmdline_types.h
@@ -27,6 +27,7 @@
 #include "unit.h"
 #include "jdwp/jdwp.h"
 #include "runtime/base/logging.h"
+#include "runtime/base/time_utils.h"
 #include "gc/collector_type.h"
 #include "gc/space/large_object_space.h"
 #include "profiler_options.h"
diff --git a/cmdline/memory_representation.h b/cmdline/memory_representation.h
index 93387de..2619c31 100644
--- a/cmdline/memory_representation.h
+++ b/cmdline/memory_representation.h
@@ -20,24 +20,25 @@
 #include <string>
 #include <assert.h>
 #include <ostream>
-#include "utils.h"
+
+#include "base/bit_utils.h"
 
 namespace art {
 
 // An integral representation of bytes of memory.
 // The underlying runtime size_t value is guaranteed to be a multiple of Divisor.
-template <size_t Divisor = 1024>
+template <size_t kDivisor = 1024>
 struct Memory {
-  static_assert(IsPowerOfTwo(Divisor), "Divisor must be a power of 2");
+  static_assert(IsPowerOfTwo(kDivisor), "Divisor must be a power of 2");
 
-  static Memory<Divisor> FromBytes(size_t bytes) {
-    assert(bytes % Divisor == 0);
-    return Memory<Divisor>(bytes);
+  static Memory<kDivisor> FromBytes(size_t bytes) {
+    assert(bytes % kDivisor == 0);
+    return Memory<kDivisor>(bytes);
   }
 
   Memory() : Value(0u) {}
   Memory(size_t value) : Value(value) {  // NOLINT [runtime/explicit] [5]
-    assert(value % Divisor == 0);
+    assert(value % kDivisor == 0);
   }
   operator size_t() const { return Value; }
 
@@ -45,12 +46,10 @@
     return Value;
   }
 
-  static constexpr size_t kDivisor = Divisor;
-
   static const char* Name() {
     static std::string str;
     if (str.empty()) {
-      str = "Memory<" + std::to_string(Divisor) + '>';
+      str = "Memory<" + std::to_string(kDivisor) + '>';
     }
 
     return str.c_str();
@@ -59,9 +58,9 @@
   size_t Value;
 };
 
-template <size_t Divisor>
-std::ostream& operator<<(std::ostream& stream, Memory<Divisor> memory) {
-  return stream << memory.Value << '*' << Divisor;
+template <size_t kDivisor>
+std::ostream& operator<<(std::ostream& stream, Memory<kDivisor> memory) {
+  return stream << memory.Value << '*' << kDivisor;
 }
 
 using MemoryKiB = Memory<1024>;
diff --git a/compiler/compiled_method.h b/compiler/compiled_method.h
index 480d021..45a62bc 100644
--- a/compiler/compiled_method.h
+++ b/compiler/compiled_method.h
@@ -22,8 +22,8 @@
 #include <vector>
 
 #include "arch/instruction_set.h"
+#include "base/bit_utils.h"
 #include "method_reference.h"
-#include "utils.h"
 #include "utils/array_ref.h"
 #include "utils/swap_space.h"
 
diff --git a/compiler/compiler.cc b/compiler/compiler.cc
index 5e8ec1e..223affa 100644
--- a/compiler/compiler.cc
+++ b/compiler/compiler.cc
@@ -20,6 +20,7 @@
 #include "dex/quick/quick_compiler_factory.h"
 #include "driver/compiler_driver.h"
 #include "optimizing/optimizing_compiler.h"
+#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/dex/compiler_ir.cc b/compiler/dex/compiler_ir.cc
index 7fc1b03..6e1853b 100644
--- a/compiler/dex/compiler_ir.cc
+++ b/compiler/dex/compiler_ir.cc
@@ -22,6 +22,7 @@
 #include "dex/quick/mir_to_lir.h"
 #include "driver/compiler_driver.h"
 #include "mir_graph.h"
+#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/dex/compiler_ir.h b/compiler/dex/compiler_ir.h
index dceea24..d28df1d 100644
--- a/compiler/dex/compiler_ir.h
+++ b/compiler/dex/compiler_ir.h
@@ -21,6 +21,7 @@
 #include <string>
 #include <vector>
 
+#include "arch/instruction_set.h"
 #include "base/arena_allocator.h"
 #include "base/scoped_arena_allocator.h"
 #include "base/timing_logger.h"
@@ -31,6 +32,7 @@
 
 class ClassLinker;
 class CompilerDriver;
+class DexFile;
 class Mir2Lir;
 class MIRGraph;
 
diff --git a/compiler/dex/local_value_numbering.cc b/compiler/dex/local_value_numbering.cc
index cc9dbe4..38f7d1e 100644
--- a/compiler/dex/local_value_numbering.cc
+++ b/compiler/dex/local_value_numbering.cc
@@ -16,9 +16,11 @@
 
 #include "local_value_numbering.h"
 
+#include "base/bit_utils.h"
 #include "global_value_numbering.h"
 #include "mir_field_info.h"
 #include "mir_graph.h"
+#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/dex/local_value_numbering.h b/compiler/dex/local_value_numbering.h
index 67fb647..dff5e27 100644
--- a/compiler/dex/local_value_numbering.h
+++ b/compiler/dex/local_value_numbering.h
@@ -106,8 +106,7 @@
   }
 
   void SetOperandValueImpl(uint16_t s_reg, uint16_t value, SregValueMap* map) {
-    DCHECK_EQ(map->count(s_reg), 0u) << PrettyMethod(gvn_->cu_->method_idx, *gvn_->cu_->dex_file)
-        << " LVN id: " << id_ << ", s_reg: " << s_reg;
+    DCHECK_EQ(map->count(s_reg), 0u);
     map->Put(s_reg, value);
   }
 
diff --git a/compiler/dex/mir_analysis.cc b/compiler/dex/mir_analysis.cc
index 9099e8a..1cff8dc 100644
--- a/compiler/dex/mir_analysis.cc
+++ b/compiler/dex/mir_analysis.cc
@@ -30,6 +30,7 @@
 #include "driver/compiler_driver.h"
 #include "driver/compiler_options.h"
 #include "driver/dex_compilation_unit.h"
+#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/dex/mir_graph.cc b/compiler/dex/mir_graph.cc
index 1871f07..9fa5148 100644
--- a/compiler/dex/mir_graph.cc
+++ b/compiler/dex/mir_graph.cc
@@ -35,6 +35,7 @@
 #include "leb128.h"
 #include "pass_driver_me_post_opt.h"
 #include "stack.h"
+#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/dex/mir_graph.h b/compiler/dex/mir_graph.h
index 7385a8b..f038397 100644
--- a/compiler/dex/mir_graph.h
+++ b/compiler/dex/mir_graph.h
@@ -20,6 +20,7 @@
 #include <stdint.h>
 
 #include "base/arena_containers.h"
+#include "base/bit_utils.h"
 #include "base/scoped_arena_containers.h"
 #include "dex_file.h"
 #include "dex_instruction.h"
diff --git a/compiler/dex/mir_optimization.cc b/compiler/dex/mir_optimization.cc
index 217dbee..7679db8 100644
--- a/compiler/dex/mir_optimization.cc
+++ b/compiler/dex/mir_optimization.cc
@@ -31,6 +31,7 @@
 #include "quick/dex_file_to_method_inliner_map.h"
 #include "stack.h"
 #include "type_inference.h"
+#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/dex/quick/arm/call_arm.cc b/compiler/dex/quick/arm/call_arm.cc
index 2b2d6af..822ea21 100644
--- a/compiler/dex/quick/arm/call_arm.cc
+++ b/compiler/dex/quick/arm/call_arm.cc
@@ -19,6 +19,7 @@
 #include "codegen_arm.h"
 
 #include "arm_lir.h"
+#include "base/bit_utils.h"
 #include "base/logging.h"
 #include "dex/mir_graph.h"
 #include "dex/quick/dex_file_to_method_inliner_map.h"
@@ -29,7 +30,6 @@
 #include "mirror/art_method.h"
 #include "mirror/object_array-inl.h"
 #include "entrypoints/quick/quick_entrypoints.h"
-#include "utils.h"
 #include "utils/dex_cache_arrays_layout-inl.h"
 
 namespace art {
diff --git a/compiler/dex/quick/arm/int_arm.cc b/compiler/dex/quick/arm/int_arm.cc
index 7598e50..7de8e55 100644
--- a/compiler/dex/quick/arm/int_arm.cc
+++ b/compiler/dex/quick/arm/int_arm.cc
@@ -20,6 +20,7 @@
 
 #include "arch/instruction_set_features.h"
 #include "arm_lir.h"
+#include "base/bit_utils.h"
 #include "base/logging.h"
 #include "dex/compiler_ir.h"
 #include "dex/mir_graph.h"
@@ -28,7 +29,6 @@
 #include "driver/compiler_driver.h"
 #include "entrypoints/quick/quick_entrypoints.h"
 #include "mirror/array-inl.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/dex/quick/arm64/fp_arm64.cc b/compiler/dex/quick/arm64/fp_arm64.cc
index 49b15fe..3b88021 100644
--- a/compiler/dex/quick/arm64/fp_arm64.cc
+++ b/compiler/dex/quick/arm64/fp_arm64.cc
@@ -20,7 +20,6 @@
 #include "base/logging.h"
 #include "dex/mir_graph.h"
 #include "dex/quick/mir_to_lir-inl.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/dex/quick/arm64/int_arm64.cc b/compiler/dex/quick/arm64/int_arm64.cc
index 9340d01..08aa5d2 100644
--- a/compiler/dex/quick/arm64/int_arm64.cc
+++ b/compiler/dex/quick/arm64/int_arm64.cc
@@ -20,6 +20,7 @@
 
 #include "arch/instruction_set_features.h"
 #include "arm64_lir.h"
+#include "base/bit_utils.h"
 #include "base/logging.h"
 #include "dex/compiler_ir.h"
 #include "dex/mir_graph.h"
@@ -28,7 +29,6 @@
 #include "driver/compiler_driver.h"
 #include "entrypoints/quick/quick_entrypoints.h"
 #include "mirror/array-inl.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/dex/quick/gen_common.cc b/compiler/dex/quick/gen_common.cc
index 0592c74..63f83f9 100644
--- a/compiler/dex/quick/gen_common.cc
+++ b/compiler/dex/quick/gen_common.cc
@@ -19,6 +19,7 @@
 #include <functional>
 
 #include "arch/arm/instruction_set_features_arm.h"
+#include "base/bit_utils.h"
 #include "base/macros.h"
 #include "dex/compiler_ir.h"
 #include "dex/mir_graph.h"
@@ -30,7 +31,6 @@
 #include "mirror/object_array-inl.h"
 #include "mirror/object-inl.h"
 #include "mirror/object_reference.h"
-#include "utils.h"
 #include "utils/dex_cache_arrays_layout-inl.h"
 #include "verifier/method_verifier.h"
 
diff --git a/compiler/dex/quick/mir_to_lir-inl.h b/compiler/dex/quick/mir_to_lir-inl.h
index 280dbbe..767fe25 100644
--- a/compiler/dex/quick/mir_to_lir-inl.h
+++ b/compiler/dex/quick/mir_to_lir-inl.h
@@ -21,6 +21,7 @@
 
 #include "base/logging.h"
 #include "dex/compiler_ir.h"
+#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/dex/quick/mir_to_lir.h b/compiler/dex/quick/mir_to_lir.h
index 4fdc728..d54616f 100644
--- a/compiler/dex/quick/mir_to_lir.h
+++ b/compiler/dex/quick/mir_to_lir.h
@@ -31,6 +31,7 @@
 #include "invoke_type.h"
 #include "lazy_debug_frame_opcode_writer.h"
 #include "leb128.h"
+#include "primitive.h"
 #include "safe_map.h"
 #include "utils/array_ref.h"
 #include "utils/dex_cache_arrays_layout.h"
diff --git a/compiler/dex/quick/resource_mask.cc b/compiler/dex/quick/resource_mask.cc
index 57e8af3..817a69a 100644
--- a/compiler/dex/quick/resource_mask.cc
+++ b/compiler/dex/quick/resource_mask.cc
@@ -18,9 +18,9 @@
 
 #include "resource_mask.h"
 
+#include "base/bit_utils.h"
 #include "base/arena_allocator.h"
 #include "base/logging.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/dex/quick/x86/assemble_x86.cc b/compiler/dex/quick/x86/assemble_x86.cc
index 8467b71..12523ac 100644
--- a/compiler/dex/quick/x86/assemble_x86.cc
+++ b/compiler/dex/quick/x86/assemble_x86.cc
@@ -16,10 +16,12 @@
 
 #include "codegen_x86.h"
 
+#include "base/bit_utils.h"
 #include "base/logging.h"
 #include "dex/compiler_ir.h"
 #include "dex/quick/mir_to_lir.h"
 #include "oat.h"
+#include "utils.h"
 #include "x86_lir.h"
 
 namespace art {
diff --git a/compiler/dex/quick/x86/int_x86.cc b/compiler/dex/quick/x86/int_x86.cc
index 943bfc0..9bbb5f8 100755
--- a/compiler/dex/quick/x86/int_x86.cc
+++ b/compiler/dex/quick/x86/int_x86.cc
@@ -18,12 +18,12 @@
 
 #include "codegen_x86.h"
 
+#include "base/bit_utils.h"
 #include "base/logging.h"
 #include "dex/quick/mir_to_lir-inl.h"
 #include "dex/reg_storage_eq.h"
 #include "mirror/art_method.h"
 #include "mirror/array-inl.h"
-#include "utils.h"
 #include "x86_lir.h"
 
 namespace art {
diff --git a/compiler/dex/type_inference.cc b/compiler/dex/type_inference.cc
index 19d591b..cd6467f 100644
--- a/compiler/dex/type_inference.cc
+++ b/compiler/dex/type_inference.cc
@@ -25,6 +25,7 @@
 #include "mir_field_info.h"
 #include "mir_graph.h"
 #include "mir_method_info.h"
+#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/dex/type_inference.h b/compiler/dex/type_inference.h
index c9b29bf..85f79af 100644
--- a/compiler/dex/type_inference.h
+++ b/compiler/dex/type_inference.h
@@ -17,6 +17,7 @@
 #ifndef ART_COMPILER_DEX_TYPE_INFERENCE_H_
 #define ART_COMPILER_DEX_TYPE_INFERENCE_H_
 
+#include "base/bit_utils.h"
 #include "base/logging.h"
 #include "base/arena_object.h"
 #include "base/scoped_arena_containers.h"
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index 5dc93ce..4945a91 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -29,6 +29,7 @@
 
 #include "art_field-inl.h"
 #include "base/stl_util.h"
+#include "base/time_utils.h"
 #include "base/timing_logger.h"
 #include "class_linker-inl.h"
 #include "compiled_class.h"
diff --git a/compiler/driver/compiler_driver.h b/compiler/driver/compiler_driver.h
index 2b0985a..2cc2409 100644
--- a/compiler/driver/compiler_driver.h
+++ b/compiler/driver/compiler_driver.h
@@ -24,6 +24,7 @@
 
 #include "arch/instruction_set.h"
 #include "base/arena_allocator.h"
+#include "base/bit_utils.h"
 #include "base/mutex.h"
 #include "base/timing_logger.h"
 #include "class_reference.h"
@@ -41,7 +42,6 @@
 #include "utils/dedupe_set.h"
 #include "utils/dex_cache_arrays_layout.h"
 #include "utils/swap_space.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/dwarf/debug_frame_opcode_writer.h b/compiler/dwarf/debug_frame_opcode_writer.h
index 4112c84..d8077d5 100644
--- a/compiler/dwarf/debug_frame_opcode_writer.h
+++ b/compiler/dwarf/debug_frame_opcode_writer.h
@@ -17,10 +17,10 @@
 #ifndef ART_COMPILER_DWARF_DEBUG_FRAME_OPCODE_WRITER_H_
 #define ART_COMPILER_DWARF_DEBUG_FRAME_OPCODE_WRITER_H_
 
+#include "base/bit_utils.h"
 #include "dwarf/dwarf_constants.h"
 #include "dwarf/register.h"
 #include "dwarf/writer.h"
-#include "utils.h"
 
 namespace art {
 namespace dwarf {
diff --git a/compiler/dwarf/dwarf_test.h b/compiler/dwarf/dwarf_test.h
index 3afb5ea..f819c49 100644
--- a/compiler/dwarf/dwarf_test.h
+++ b/compiler/dwarf/dwarf_test.h
@@ -25,7 +25,6 @@
 #include <string>
 #include <sys/types.h>
 
-#include "utils.h"
 #include "base/unix_file/fd_file.h"
 #include "common_runtime_test.h"
 #include "elf_builder.h"
diff --git a/compiler/dwarf/writer.h b/compiler/dwarf/writer.h
index 3b9c558..e703aee 100644
--- a/compiler/dwarf/writer.h
+++ b/compiler/dwarf/writer.h
@@ -18,9 +18,9 @@
 #define ART_COMPILER_DWARF_WRITER_H_
 
 #include <vector>
-#include "leb128.h"
+#include "base/bit_utils.h"
 #include "base/logging.h"
-#include "utils.h"
+#include "leb128.h"
 
 namespace art {
 namespace dwarf {
diff --git a/compiler/elf_builder.h b/compiler/elf_builder.h
index 972bd08..8a63a48 100644
--- a/compiler/elf_builder.h
+++ b/compiler/elf_builder.h
@@ -20,6 +20,7 @@
 #include <vector>
 
 #include "arch/instruction_set.h"
+#include "base/bit_utils.h"
 #include "base/unix_file/fd_file.h"
 #include "buffered_output_stream.h"
 #include "elf_utils.h"
diff --git a/compiler/elf_writer_debug.cc b/compiler/elf_writer_debug.cc
index f4df6c1..c68bbc0 100644
--- a/compiler/elf_writer_debug.cc
+++ b/compiler/elf_writer_debug.cc
@@ -25,6 +25,7 @@
 #include "dwarf/headers.h"
 #include "dwarf/register.h"
 #include "oat_writer.h"
+#include "utils.h"
 
 namespace art {
 namespace dwarf {
diff --git a/compiler/gc_map_builder.h b/compiler/gc_map_builder.h
index 4c36ef7..45e3fc5 100644
--- a/compiler/gc_map_builder.h
+++ b/compiler/gc_map_builder.h
@@ -19,8 +19,8 @@
 
 #include <vector>
 
+#include "base/bit_utils.h"
 #include "gc_map.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/image_writer.h b/compiler/image_writer.h
index c0cffa5..5921732 100644
--- a/compiler/image_writer.h
+++ b/compiler/image_writer.h
@@ -26,6 +26,7 @@
 #include <string>
 #include <ostream>
 
+#include "base/bit_utils.h"
 #include "base/macros.h"
 #include "driver/compiler_driver.h"
 #include "gc/space/space.h"
@@ -35,7 +36,6 @@
 #include "os.h"
 #include "safe_map.h"
 #include "gc/space/space.h"
-#include "utils.h"
 
 namespace art {
 
@@ -136,7 +136,7 @@
 
   friend std::ostream& operator<<(std::ostream& stream, const Bin& bin);
 
-  static constexpr size_t kBinBits = MinimumBitsToStore(kBinMirrorCount - 1);
+  static constexpr size_t kBinBits = MinimumBitsToStore<uint32_t>(kBinMirrorCount - 1);
   // uint32 = typeof(lockword_)
   static constexpr size_t kBinShift = BitSizeOf<uint32_t>() - kBinBits;
   // 111000.....0
diff --git a/compiler/jit/jit_compiler.cc b/compiler/jit/jit_compiler.cc
index 7c400ee..7ed7097 100644
--- a/compiler/jit/jit_compiler.cc
+++ b/compiler/jit/jit_compiler.cc
@@ -18,6 +18,7 @@
 
 #include "arch/instruction_set.h"
 #include "arch/instruction_set_features.h"
+#include "base/time_utils.h"
 #include "base/timing_logger.h"
 #include "compiler_callbacks.h"
 #include "dex/pass_manager.h"
diff --git a/compiler/jni/quick/arm64/calling_convention_arm64.cc b/compiler/jni/quick/arm64/calling_convention_arm64.cc
index a6caff1..4344c90 100644
--- a/compiler/jni/quick/arm64/calling_convention_arm64.cc
+++ b/compiler/jni/quick/arm64/calling_convention_arm64.cc
@@ -158,7 +158,8 @@
                                                      const char* shorty)
     : JniCallingConvention(is_static, is_synchronized, shorty, kFramePointerSize) {
   uint32_t core_spill_mask = CoreSpillMask();
-  for (int x_reg = 0; x_reg < kNumberOfXRegisters; ++x_reg) {
+  DCHECK_EQ(XZR, kNumberOfXRegisters - 1);  // Exclude XZR from the loop (avoid 1 << 32).
+  for (int x_reg = 0; x_reg < kNumberOfXRegisters - 1; ++x_reg) {
     if (((1 << x_reg) & core_spill_mask) != 0) {
       callee_save_regs_.push_back(
           Arm64ManagedRegister::FromXRegister(static_cast<XRegister>(x_reg)));
diff --git a/compiler/jni/quick/calling_convention.cc b/compiler/jni/quick/calling_convention.cc
index 436fc0c..2e146c4 100644
--- a/compiler/jni/quick/calling_convention.cc
+++ b/compiler/jni/quick/calling_convention.cc
@@ -23,7 +23,6 @@
 #include "jni/quick/mips64/calling_convention_mips64.h"
 #include "jni/quick/x86/calling_convention_x86.h"
 #include "jni/quick/x86_64/calling_convention_x86_64.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/jni/quick/x86/calling_convention_x86.cc b/compiler/jni/quick/x86/calling_convention_x86.cc
index 8a45f0c..499dd7c 100644
--- a/compiler/jni/quick/x86/calling_convention_x86.cc
+++ b/compiler/jni/quick/x86/calling_convention_x86.cc
@@ -19,7 +19,6 @@
 #include "base/logging.h"
 #include "handle_scope-inl.h"
 #include "utils/x86/managed_register_x86.h"
-#include "utils.h"
 
 namespace art {
 namespace x86 {
diff --git a/compiler/jni/quick/x86_64/calling_convention_x86_64.cc b/compiler/jni/quick/x86_64/calling_convention_x86_64.cc
index bbdf1fe..7e92d12 100644
--- a/compiler/jni/quick/x86_64/calling_convention_x86_64.cc
+++ b/compiler/jni/quick/x86_64/calling_convention_x86_64.cc
@@ -16,10 +16,10 @@
 
 #include "calling_convention_x86_64.h"
 
+#include "base/bit_utils.h"
 #include "base/logging.h"
 #include "handle_scope-inl.h"
 #include "utils/x86_64/managed_register_x86_64.h"
-#include "utils.h"
 
 namespace art {
 namespace x86_64 {
diff --git a/compiler/optimizing/code_generator_arm.cc b/compiler/optimizing/code_generator_arm.cc
index 1c76630..5f8023d 100644
--- a/compiler/optimizing/code_generator_arm.cc
+++ b/compiler/optimizing/code_generator_arm.cc
@@ -494,11 +494,6 @@
         assembler_(codegen->GetAssembler()),
         codegen_(codegen) {}
 
-static uint32_t LeastSignificantBit(uint32_t mask) {
-  // ffs starts at 1.
-  return ffs(mask) - 1;
-}
-
 void CodeGeneratorARM::ComputeSpillMask() {
   core_spill_mask_ = allocated_registers_.GetCoreRegisters() & core_callee_save_mask_;
   // Save one extra register for baseline. Note that on thumb2, there is no easy
@@ -2222,7 +2217,7 @@
   Register dividend = locations->InAt(0).AsRegister<Register>();
   Register temp = locations->GetTemp(0).AsRegister<Register>();
   int32_t imm = second.GetConstant()->AsIntConstant()->GetValue();
-  int32_t abs_imm = std::abs(imm);
+  uint32_t abs_imm = static_cast<uint32_t>(std::abs(imm));
   DCHECK(IsPowerOfTwo(abs_imm));
   int ctz_imm = CTZ(abs_imm);
 
diff --git a/compiler/optimizing/code_generator_arm64.cc b/compiler/optimizing/code_generator_arm64.cc
index b6d99ab..ced60cd 100644
--- a/compiler/optimizing/code_generator_arm64.cc
+++ b/compiler/optimizing/code_generator_arm64.cc
@@ -1738,7 +1738,7 @@
   Register out = OutputRegister(instruction);
   Register dividend = InputRegisterAt(instruction, 0);
   int64_t imm = Int64FromConstant(second.GetConstant());
-  int64_t abs_imm = std::abs(imm);
+  uint64_t abs_imm = static_cast<uint64_t>(std::abs(imm));
   DCHECK(IsPowerOfTwo(abs_imm));
   int ctz_imm = CTZ(abs_imm);
 
diff --git a/compiler/optimizing/intrinsics.cc b/compiler/optimizing/intrinsics.cc
index 43fe374..9e18f11 100644
--- a/compiler/optimizing/intrinsics.cc
+++ b/compiler/optimizing/intrinsics.cc
@@ -22,6 +22,7 @@
 #include "invoke_type.h"
 #include "nodes.h"
 #include "quick/inline_method_analyser.h"
+#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/optimizing/nodes.cc b/compiler/optimizing/nodes.cc
index 47da9cc..91daeb7 100644
--- a/compiler/optimizing/nodes.cc
+++ b/compiler/optimizing/nodes.cc
@@ -19,6 +19,7 @@
 #include "code_generator.h"
 #include "ssa_builder.h"
 #include "base/bit_vector-inl.h"
+#include "base/bit_utils.h"
 #include "utils/growable_array.h"
 #include "scoped_thread_state_change.h"
 
diff --git a/compiler/optimizing/parallel_move_resolver.h b/compiler/optimizing/parallel_move_resolver.h
index e89417d..9ede910 100644
--- a/compiler/optimizing/parallel_move_resolver.h
+++ b/compiler/optimizing/parallel_move_resolver.h
@@ -20,6 +20,7 @@
 #include "base/value_object.h"
 #include "utils/growable_array.h"
 #include "locations.h"
+#include "primitive.h"
 
 namespace art {
 
diff --git a/compiler/optimizing/register_allocator.h b/compiler/optimizing/register_allocator.h
index 6d5bfc3..c29fe75 100644
--- a/compiler/optimizing/register_allocator.h
+++ b/compiler/optimizing/register_allocator.h
@@ -17,6 +17,7 @@
 #ifndef ART_COMPILER_OPTIMIZING_REGISTER_ALLOCATOR_H_
 #define ART_COMPILER_OPTIMIZING_REGISTER_ALLOCATOR_H_
 
+#include "arch/instruction_set.h"
 #include "base/macros.h"
 #include "primitive.h"
 #include "utils/growable_array.h"
diff --git a/compiler/utils/arm/assembler_arm.cc b/compiler/utils/arm/assembler_arm.cc
index eca6f5a..0cd5c8b 100644
--- a/compiler/utils/arm/assembler_arm.cc
+++ b/compiler/utils/arm/assembler_arm.cc
@@ -16,11 +16,11 @@
 
 #include "assembler_arm.h"
 
+#include "base/bit_utils.h"
 #include "base/logging.h"
 #include "entrypoints/quick/quick_entrypoints.h"
 #include "offsets.h"
 #include "thread.h"
-#include "utils.h"
 
 namespace art {
 namespace arm {
diff --git a/compiler/utils/arm/assembler_arm.h b/compiler/utils/arm/assembler_arm.h
index dee8287..e2c2e27 100644
--- a/compiler/utils/arm/assembler_arm.h
+++ b/compiler/utils/arm/assembler_arm.h
@@ -19,13 +19,13 @@
 
 #include <vector>
 
+#include "base/bit_utils.h"
 #include "base/logging.h"
 #include "base/value_object.h"
 #include "constants_arm.h"
 #include "utils/arm/managed_register_arm.h"
 #include "utils/assembler.h"
 #include "offsets.h"
-#include "utils.h"
 
 namespace art {
 namespace arm {
diff --git a/compiler/utils/arm/assembler_arm32.cc b/compiler/utils/arm/assembler_arm32.cc
index 6e165fc..cdf62bf 100644
--- a/compiler/utils/arm/assembler_arm32.cc
+++ b/compiler/utils/arm/assembler_arm32.cc
@@ -16,11 +16,11 @@
 
 #include "assembler_arm32.h"
 
+#include "base/bit_utils.h"
 #include "base/logging.h"
 #include "entrypoints/quick/quick_entrypoints.h"
 #include "offsets.h"
 #include "thread.h"
-#include "utils.h"
 
 namespace art {
 namespace arm {
diff --git a/compiler/utils/arm/assembler_arm32.h b/compiler/utils/arm/assembler_arm32.h
index 55ec7b4..82fed50 100644
--- a/compiler/utils/arm/assembler_arm32.h
+++ b/compiler/utils/arm/assembler_arm32.h
@@ -24,7 +24,6 @@
 #include "utils/arm/managed_register_arm.h"
 #include "utils/arm/assembler_arm.h"
 #include "offsets.h"
-#include "utils.h"
 
 namespace art {
 namespace arm {
diff --git a/compiler/utils/arm/assembler_thumb2.cc b/compiler/utils/arm/assembler_thumb2.cc
index 75f2b77..ab83f95 100644
--- a/compiler/utils/arm/assembler_thumb2.cc
+++ b/compiler/utils/arm/assembler_thumb2.cc
@@ -16,11 +16,11 @@
 
 #include "assembler_thumb2.h"
 
+#include "base/bit_utils.h"
 #include "base/logging.h"
 #include "entrypoints/quick/quick_entrypoints.h"
 #include "offsets.h"
 #include "thread.h"
-#include "utils.h"
 
 namespace art {
 namespace arm {
diff --git a/compiler/utils/arm/assembler_thumb2.h b/compiler/utils/arm/assembler_thumb2.h
index 90d489f..2da8ee2 100644
--- a/compiler/utils/arm/assembler_thumb2.h
+++ b/compiler/utils/arm/assembler_thumb2.h
@@ -24,7 +24,6 @@
 #include "utils/arm/managed_register_arm.h"
 #include "utils/arm/assembler_arm.h"
 #include "offsets.h"
-#include "utils.h"
 
 namespace art {
 namespace arm {
diff --git a/compiler/utils/arm64/assembler_arm64.cc b/compiler/utils/arm64/assembler_arm64.cc
index 98702a2..3ee79a1 100644
--- a/compiler/utils/arm64/assembler_arm64.cc
+++ b/compiler/utils/arm64/assembler_arm64.cc
@@ -19,7 +19,6 @@
 #include "entrypoints/quick/quick_entrypoints.h"
 #include "offsets.h"
 #include "thread.h"
-#include "utils.h"
 
 using namespace vixl;  // NOLINT(build/namespaces)
 
diff --git a/compiler/utils/arm64/assembler_arm64.h b/compiler/utils/arm64/assembler_arm64.h
index e47b531..b1b66ed 100644
--- a/compiler/utils/arm64/assembler_arm64.h
+++ b/compiler/utils/arm64/assembler_arm64.h
@@ -26,7 +26,6 @@
 #include "utils/arm64/managed_register_arm64.h"
 #include "utils/assembler.h"
 #include "offsets.h"
-#include "utils.h"
 
 // TODO: make vixl clean wrt -Wshadow.
 #pragma GCC diagnostic push
diff --git a/compiler/utils/arm64/managed_register_arm64.h b/compiler/utils/arm64/managed_register_arm64.h
index 62c1d4d..dbcd8c5 100644
--- a/compiler/utils/arm64/managed_register_arm64.h
+++ b/compiler/utils/arm64/managed_register_arm64.h
@@ -117,8 +117,7 @@
 
   bool IsSRegister() const {
     CHECK(IsValidManagedRegister());
-    const int test = id_ - (kNumberOfXRegIds + kNumberOfWRegIds +
-                            kNumberOfDRegIds);
+    const int test = id_ - (kNumberOfXRegIds + kNumberOfWRegIds + kNumberOfDRegIds);
     return (0 <= test) && (test < kNumberOfSRegIds);
   }
 
diff --git a/compiler/utils/assembler_test_base.h b/compiler/utils/assembler_test_base.h
index 3341151..574051a 100644
--- a/compiler/utils/assembler_test_base.h
+++ b/compiler/utils/assembler_test_base.h
@@ -17,14 +17,15 @@
 #ifndef ART_COMPILER_UTILS_ASSEMBLER_TEST_BASE_H_
 #define ART_COMPILER_UTILS_ASSEMBLER_TEST_BASE_H_
 
-#include "common_runtime_test.h"  // For ScratchFile
-
 #include <cstdio>
 #include <cstdlib>
 #include <fstream>
 #include <iterator>
 #include <sys/stat.h>
 
+#include "common_runtime_test.h"  // For ScratchFile
+#include "utils.h"
+
 namespace art {
 
 // If you want to take a look at the differences between the ART assembler and GCC, set this flag
diff --git a/compiler/utils/dedupe_set.h b/compiler/utils/dedupe_set.h
index a9a5781..8cdb180 100644
--- a/compiler/utils/dedupe_set.h
+++ b/compiler/utils/dedupe_set.h
@@ -26,6 +26,7 @@
 #include "base/mutex.h"
 #include "base/stl_util.h"
 #include "base/stringprintf.h"
+#include "base/time_utils.h"
 #include "utils/swap_space.h"
 
 namespace art {
diff --git a/compiler/utils/dex_cache_arrays_layout-inl.h b/compiler/utils/dex_cache_arrays_layout-inl.h
index 2c50c96..a71eece 100644
--- a/compiler/utils/dex_cache_arrays_layout-inl.h
+++ b/compiler/utils/dex_cache_arrays_layout-inl.h
@@ -19,11 +19,11 @@
 
 #include "dex_cache_arrays_layout.h"
 
+#include "base/bit_utils.h"
 #include "base/logging.h"
 #include "globals.h"
 #include "mirror/array-inl.h"
 #include "primitive.h"
-#include "utils.h"
 
 namespace mirror {
 class ArtMethod;
diff --git a/compiler/utils/mips/assembler_mips.cc b/compiler/utils/mips/assembler_mips.cc
index 709a911..e769489 100644
--- a/compiler/utils/mips/assembler_mips.cc
+++ b/compiler/utils/mips/assembler_mips.cc
@@ -16,6 +16,7 @@
 
 #include "assembler_mips.h"
 
+#include "base/bit_utils.h"
 #include "base/casts.h"
 #include "entrypoints/quick/quick_entrypoints.h"
 #include "memory_region.h"
diff --git a/compiler/utils/mips/assembler_mips.h b/compiler/utils/mips/assembler_mips.h
index d4acf03..34713e1 100644
--- a/compiler/utils/mips/assembler_mips.h
+++ b/compiler/utils/mips/assembler_mips.h
@@ -25,7 +25,6 @@
 #include "managed_register_mips.h"
 #include "utils/assembler.h"
 #include "offsets.h"
-#include "utils.h"
 
 namespace art {
 namespace mips {
diff --git a/compiler/utils/mips64/assembler_mips64.cc b/compiler/utils/mips64/assembler_mips64.cc
index 5e9653d..b95e436 100644
--- a/compiler/utils/mips64/assembler_mips64.cc
+++ b/compiler/utils/mips64/assembler_mips64.cc
@@ -16,6 +16,7 @@
 
 #include "assembler_mips64.h"
 
+#include "base/bit_utils.h"
 #include "base/casts.h"
 #include "entrypoints/quick/quick_entrypoints.h"
 #include "memory_region.h"
@@ -116,7 +117,7 @@
 
 int32_t Mips64Assembler::EncodeBranchOffset(int offset, int32_t inst, bool is_jump) {
   CHECK_ALIGNED(offset, 4);
-  CHECK(IsInt(POPCOUNT(kBranchOffsetMask), offset)) << offset;
+  CHECK(IsInt<POPCOUNT(kBranchOffsetMask)>(offset)) << offset;
 
   // Properly preserve only the bits supported in the instruction.
   offset >>= 2;
diff --git a/compiler/utils/mips64/assembler_mips64.h b/compiler/utils/mips64/assembler_mips64.h
index 2d7c661..95ba967 100644
--- a/compiler/utils/mips64/assembler_mips64.h
+++ b/compiler/utils/mips64/assembler_mips64.h
@@ -25,7 +25,6 @@
 #include "managed_register_mips64.h"
 #include "utils/assembler.h"
 #include "offsets.h"
-#include "utils.h"
 
 namespace art {
 namespace mips64 {
diff --git a/compiler/utils/swap_space.h b/compiler/utils/swap_space.h
index 1f8f5da..691df4a 100644
--- a/compiler/utils/swap_space.h
+++ b/compiler/utils/swap_space.h
@@ -28,7 +28,6 @@
 #include "base/macros.h"
 #include "base/mutex.h"
 #include "mem_map.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/utils/test_dex_file_builder.h b/compiler/utils/test_dex_file_builder.h
index ab039aa..b1d7b4c 100644
--- a/compiler/utils/test_dex_file_builder.h
+++ b/compiler/utils/test_dex_file_builder.h
@@ -22,8 +22,9 @@
 #include <map>
 #include <vector>
 
+#include "base/bit_utils.h"
+#include "base/logging.h"
 #include "dex_file.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/utils/test_dex_file_builder_test.cc b/compiler/utils/test_dex_file_builder_test.cc
index ee6e35d..7a424a2 100644
--- a/compiler/utils/test_dex_file_builder_test.cc
+++ b/compiler/utils/test_dex_file_builder_test.cc
@@ -18,6 +18,7 @@
 
 #include "dex_file-inl.h"
 #include "gtest/gtest.h"
+#include "utils.h"
 
 namespace art {
 
diff --git a/compiler/utils/x86/assembler_x86.h b/compiler/utils/x86/assembler_x86.h
index 136b0cb..5319dac 100644
--- a/compiler/utils/x86/assembler_x86.h
+++ b/compiler/utils/x86/assembler_x86.h
@@ -18,13 +18,13 @@
 #define ART_COMPILER_UTILS_X86_ASSEMBLER_X86_H_
 
 #include <vector>
+#include "base/bit_utils.h"
 #include "base/macros.h"
 #include "constants_x86.h"
 #include "globals.h"
 #include "managed_register_x86.h"
 #include "offsets.h"
 #include "utils/assembler.h"
-#include "utils.h"
 
 namespace art {
 namespace x86 {
diff --git a/compiler/utils/x86_64/assembler_x86_64.h b/compiler/utils/x86_64/assembler_x86_64.h
index 162714a..7daf994 100644
--- a/compiler/utils/x86_64/assembler_x86_64.h
+++ b/compiler/utils/x86_64/assembler_x86_64.h
@@ -18,13 +18,14 @@
 #define ART_COMPILER_UTILS_X86_64_ASSEMBLER_X86_64_H_
 
 #include <vector>
+
+#include "base/bit_utils.h"
 #include "base/macros.h"
 #include "constants_x86_64.h"
 #include "globals.h"
 #include "managed_register_x86_64.h"
 #include "offsets.h"
 #include "utils/assembler.h"
-#include "utils.h"
 
 namespace art {
 namespace x86_64 {
diff --git a/compiler/utils/x86_64/assembler_x86_64_test.cc b/compiler/utils/x86_64/assembler_x86_64_test.cc
index 0be4d63..dcffe35 100644
--- a/compiler/utils/x86_64/assembler_x86_64_test.cc
+++ b/compiler/utils/x86_64/assembler_x86_64_test.cc
@@ -20,9 +20,9 @@
 #include <map>
 #include <random>
 
+#include "base/bit_utils.h"
 #include "base/stl_util.h"
 #include "utils/assembler_test.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/dex2oat/dex2oat.cc b/dex2oat/dex2oat.cc
index 43bec37..e0f367e 100644
--- a/dex2oat/dex2oat.cc
+++ b/dex2oat/dex2oat.cc
@@ -41,6 +41,7 @@
 #include "base/macros.h"
 #include "base/stl_util.h"
 #include "base/stringpiece.h"
+#include "base/time_utils.h"
 #include "base/timing_logger.h"
 #include "base/unix_file/fd_file.h"
 #include "class_linker.h"
diff --git a/patchoat/patchoat.h b/patchoat/patchoat.h
index 86f9118..8f16f6b 100644
--- a/patchoat/patchoat.h
+++ b/patchoat/patchoat.h
@@ -25,7 +25,6 @@
 #include "gc/accounting/space_bitmap.h"
 #include "gc/heap.h"
 #include "os.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/runtime/Android.mk b/runtime/Android.mk
index ece9d4b..a4fa24d 100644
--- a/runtime/Android.mk
+++ b/runtime/Android.mk
@@ -32,6 +32,7 @@
   base/scoped_flock.cc \
   base/stringpiece.cc \
   base/stringprintf.cc \
+  base/time_utils.cc \
   base/timing_logger.cc \
   base/unix_file/fd_file.cc \
   base/unix_file/random_access_file_utils.cc \
diff --git a/runtime/arch/arm/context_arm.cc b/runtime/arch/arm/context_arm.cc
index 5bd23d0..c0e658c 100644
--- a/runtime/arch/arm/context_arm.cc
+++ b/runtime/arch/arm/context_arm.cc
@@ -16,9 +16,9 @@
 
 #include "context_arm.h"
 
+#include "base/bit_utils.h"
 #include "mirror/art_method-inl.h"
 #include "quick/quick_method_frame_info.h"
-#include "utils.h"
 
 namespace art {
 namespace arm {
@@ -26,12 +26,8 @@
 static constexpr uint32_t gZero = 0;
 
 void ArmContext::Reset() {
-  for (size_t i = 0; i < kNumberOfCoreRegisters; i++) {
-    gprs_[i] = nullptr;
-  }
-  for (size_t i = 0; i < kNumberOfSRegisters; i++) {
-    fprs_[i] = nullptr;
-  }
+  std::fill_n(gprs_, arraysize(gprs_), nullptr);
+  std::fill_n(fprs_, arraysize(fprs_), nullptr);
   gprs_[SP] = &sp_;
   gprs_[PC] = &pc_;
   // Initialize registers with easy to spot debug values.
@@ -42,29 +38,23 @@
 void ArmContext::FillCalleeSaves(const StackVisitor& fr) {
   mirror::ArtMethod* method = fr.GetMethod();
   const QuickMethodFrameInfo frame_info = method->GetQuickFrameInfo();
-  size_t spill_count = POPCOUNT(frame_info.CoreSpillMask());
-  size_t fp_spill_count = POPCOUNT(frame_info.FpSpillMask());
-  if (spill_count > 0) {
-    // Lowest number spill is farthest away, walk registers and fill into context
-    int j = 1;
-    for (size_t i = 0; i < kNumberOfCoreRegisters; i++) {
-      if (((frame_info.CoreSpillMask() >> i) & 1) != 0) {
-        gprs_[i] = fr.CalleeSaveAddress(spill_count - j, frame_info.FrameSizeInBytes());
-        j++;
-      }
-    }
+  int spill_pos = 0;
+
+  // Core registers come first, from the highest down to the lowest.
+  uint32_t core_regs = frame_info.CoreSpillMask();
+  DCHECK_EQ(0u, core_regs & (static_cast<uint32_t>(-1) << kNumberOfCoreRegisters));
+  for (uint32_t core_reg : HighToLowBits(core_regs)) {
+    gprs_[core_reg] = fr.CalleeSaveAddress(spill_pos, frame_info.FrameSizeInBytes());
+    ++spill_pos;
   }
-  if (fp_spill_count > 0) {
-    // Lowest number spill is farthest away, walk registers and fill into context
-    int j = 1;
-    for (size_t i = 0; i < kNumberOfSRegisters; i++) {
-      if (((frame_info.FpSpillMask() >> i) & 1) != 0) {
-        fprs_[i] = fr.CalleeSaveAddress(spill_count + fp_spill_count - j,
-                                        frame_info.FrameSizeInBytes());
-        j++;
-      }
-    }
+  DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask()));
+
+  // FP registers come second, from the highest down to the lowest.
+  for (uint32_t fp_reg : HighToLowBits(frame_info.FpSpillMask())) {
+    fprs_[fp_reg] = fr.CalleeSaveAddress(spill_pos, frame_info.FrameSizeInBytes());
+    ++spill_pos;
   }
+  DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask()) + POPCOUNT(frame_info.FpSpillMask()));
 }
 
 void ArmContext::SetGPR(uint32_t reg, uintptr_t value) {
diff --git a/runtime/arch/arm/quick_method_frame_info_arm.h b/runtime/arch/arm/quick_method_frame_info_arm.h
index c1f3fc2..5580ee4 100644
--- a/runtime/arch/arm/quick_method_frame_info_arm.h
+++ b/runtime/arch/arm/quick_method_frame_info_arm.h
@@ -17,10 +17,10 @@
 #ifndef ART_RUNTIME_ARCH_ARM_QUICK_METHOD_FRAME_INFO_ARM_H_
 #define ART_RUNTIME_ARCH_ARM_QUICK_METHOD_FRAME_INFO_ARM_H_
 
+#include "base/bit_utils.h"
 #include "quick/quick_method_frame_info.h"
 #include "registers_arm.h"
 #include "runtime.h"  // for Runtime::CalleeSaveType.
-#include "utils.h"
 
 namespace art {
 namespace arm {
diff --git a/runtime/arch/arm64/context_arm64.cc b/runtime/arch/arm64/context_arm64.cc
index ec9c122..9c7bb55 100644
--- a/runtime/arch/arm64/context_arm64.cc
+++ b/runtime/arch/arm64/context_arm64.cc
@@ -18,9 +18,9 @@
 
 #include "context_arm64.h"
 
+#include "base/bit_utils.h"
 #include "mirror/art_method-inl.h"
 #include "quick/quick_method_frame_info.h"
-#include "utils.h"
 
 namespace art {
 namespace arm64 {
@@ -28,12 +28,8 @@
 static constexpr uint64_t gZero = 0;
 
 void Arm64Context::Reset() {
-  for (size_t i = 0; i < kNumberOfXRegisters; i++) {
-    gprs_[i] = nullptr;
-  }
-  for (size_t i = 0; i < kNumberOfDRegisters; i++) {
-    fprs_[i] = nullptr;
-  }
+  std::fill_n(gprs_, arraysize(gprs_), nullptr);
+  std::fill_n(fprs_, arraysize(fprs_), nullptr);
   gprs_[SP] = &sp_;
   gprs_[LR] = &pc_;
   // Initialize registers with easy to spot debug values.
@@ -44,30 +40,21 @@
 void Arm64Context::FillCalleeSaves(const StackVisitor& fr) {
   mirror::ArtMethod* method = fr.GetMethod();
   const QuickMethodFrameInfo frame_info = method->GetQuickFrameInfo();
-  size_t spill_count = POPCOUNT(frame_info.CoreSpillMask());
-  size_t fp_spill_count = POPCOUNT(frame_info.FpSpillMask());
-  if (spill_count > 0) {
-    // Lowest number spill is farthest away, walk registers and fill into context.
-    int j = 1;
-    for (size_t i = 0; i < kNumberOfXRegisters; i++) {
-      if (((frame_info.CoreSpillMask() >> i) & 1) != 0) {
-        gprs_[i] = fr.CalleeSaveAddress(spill_count  - j, frame_info.FrameSizeInBytes());
-        j++;
-      }
-    }
-  }
+  int spill_pos = 0;
 
-  if (fp_spill_count > 0) {
-    // Lowest number spill is farthest away, walk registers and fill into context.
-    int j = 1;
-    for (size_t i = 0; i < kNumberOfDRegisters; i++) {
-      if (((frame_info.FpSpillMask() >> i) & 1) != 0) {
-        fprs_[i] = fr.CalleeSaveAddress(spill_count + fp_spill_count - j,
-                                        frame_info.FrameSizeInBytes());
-        j++;
-      }
-    }
+  // Core registers come first, from the highest down to the lowest.
+  for (uint32_t core_reg : HighToLowBits(frame_info.CoreSpillMask())) {
+    gprs_[core_reg] = fr.CalleeSaveAddress(spill_pos, frame_info.FrameSizeInBytes());
+    ++spill_pos;
   }
+  DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask()));
+
+  // FP registers come second, from the highest down to the lowest.
+  for (uint32_t fp_reg : HighToLowBits(frame_info.FpSpillMask())) {
+    fprs_[fp_reg] = fr.CalleeSaveAddress(spill_pos, frame_info.FrameSizeInBytes());
+    ++spill_pos;
+  }
+  DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask()) + POPCOUNT(frame_info.FpSpillMask()));
 }
 
 void Arm64Context::SetGPR(uint32_t reg, uintptr_t value) {
diff --git a/runtime/arch/arm64/quick_method_frame_info_arm64.h b/runtime/arch/arm64/quick_method_frame_info_arm64.h
index 61b4dff..dfb3f99 100644
--- a/runtime/arch/arm64/quick_method_frame_info_arm64.h
+++ b/runtime/arch/arm64/quick_method_frame_info_arm64.h
@@ -17,10 +17,10 @@
 #ifndef ART_RUNTIME_ARCH_ARM64_QUICK_METHOD_FRAME_INFO_ARM64_H_
 #define ART_RUNTIME_ARCH_ARM64_QUICK_METHOD_FRAME_INFO_ARM64_H_
 
+#include "base/bit_utils.h"
 #include "quick/quick_method_frame_info.h"
 #include "registers_arm64.h"
 #include "runtime.h"  // for Runtime::CalleeSaveType.
-#include "utils.h"  // for POPCOUNT
 
 namespace art {
 namespace arm64 {
diff --git a/runtime/arch/mips/context_mips.cc b/runtime/arch/mips/context_mips.cc
index 3b525be..f0c893a 100644
--- a/runtime/arch/mips/context_mips.cc
+++ b/runtime/arch/mips/context_mips.cc
@@ -16,9 +16,9 @@
 
 #include "context_mips.h"
 
+#include "base/bit_utils.h"
 #include "mirror/art_method-inl.h"
 #include "quick/quick_method_frame_info.h"
-#include "utils.h"
 
 namespace art {
 namespace mips {
@@ -26,12 +26,8 @@
 static constexpr uint32_t gZero = 0;
 
 void MipsContext::Reset() {
-  for (size_t i = 0; i < kNumberOfCoreRegisters; i++) {
-    gprs_[i] = nullptr;
-  }
-  for (size_t i = 0; i < kNumberOfFRegisters; i++) {
-    fprs_[i] = nullptr;
-  }
+  std::fill_n(gprs_, arraysize(gprs_), nullptr);
+  std::fill_n(fprs_, arraysize(fprs_), nullptr);
   gprs_[SP] = &sp_;
   gprs_[RA] = &ra_;
   // Initialize registers with easy to spot debug values.
@@ -42,29 +38,21 @@
 void MipsContext::FillCalleeSaves(const StackVisitor& fr) {
   mirror::ArtMethod* method = fr.GetMethod();
   const QuickMethodFrameInfo frame_info = method->GetQuickFrameInfo();
-  size_t spill_count = POPCOUNT(frame_info.CoreSpillMask());
-  size_t fp_spill_count = POPCOUNT(frame_info.FpSpillMask());
-  if (spill_count > 0) {
-    // Lowest number spill is farthest away, walk registers and fill into context.
-    int j = 1;
-    for (size_t i = 0; i < kNumberOfCoreRegisters; i++) {
-      if (((frame_info.CoreSpillMask() >> i) & 1) != 0) {
-        gprs_[i] = fr.CalleeSaveAddress(spill_count - j, frame_info.FrameSizeInBytes());
-        j++;
-      }
-    }
+  int spill_pos = 0;
+
+  // Core registers come first, from the highest down to the lowest.
+  for (uint32_t core_reg : HighToLowBits(frame_info.CoreSpillMask())) {
+    gprs_[core_reg] = fr.CalleeSaveAddress(spill_pos, frame_info.FrameSizeInBytes());
+    ++spill_pos;
   }
-  if (fp_spill_count > 0) {
-    // Lowest number spill is farthest away, walk registers and fill into context.
-    int j = 1;
-    for (size_t i = 0; i < kNumberOfFRegisters; i++) {
-      if (((frame_info.FpSpillMask() >> i) & 1) != 0) {
-        fprs_[i] = fr.CalleeSaveAddress(spill_count + fp_spill_count - j,
-                                        frame_info.FrameSizeInBytes());
-        j++;
-      }
-    }
+  DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask()));
+
+  // FP registers come second, from the highest down to the lowest.
+  for (uint32_t fp_reg : HighToLowBits(frame_info.FpSpillMask())) {
+    fprs_[fp_reg] = fr.CalleeSaveAddress(spill_pos, frame_info.FrameSizeInBytes());
+    ++spill_pos;
   }
+  DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask()) + POPCOUNT(frame_info.FpSpillMask()));
 }
 
 void MipsContext::SetGPR(uint32_t reg, uintptr_t value) {
diff --git a/runtime/arch/mips/quick_method_frame_info_mips.h b/runtime/arch/mips/quick_method_frame_info_mips.h
index 5fbffbc..97b295f 100644
--- a/runtime/arch/mips/quick_method_frame_info_mips.h
+++ b/runtime/arch/mips/quick_method_frame_info_mips.h
@@ -17,6 +17,7 @@
 #ifndef ART_RUNTIME_ARCH_MIPS_QUICK_METHOD_FRAME_INFO_MIPS_H_
 #define ART_RUNTIME_ARCH_MIPS_QUICK_METHOD_FRAME_INFO_MIPS_H_
 
+#include "base/bit_utils.h"
 #include "quick/quick_method_frame_info.h"
 #include "registers_mips.h"
 #include "runtime.h"  // for Runtime::CalleeSaveType.
diff --git a/runtime/arch/mips64/context_mips64.cc b/runtime/arch/mips64/context_mips64.cc
index 6b3f4c9..8ce6cf0 100644
--- a/runtime/arch/mips64/context_mips64.cc
+++ b/runtime/arch/mips64/context_mips64.cc
@@ -16,9 +16,9 @@
 
 #include "context_mips64.h"
 
+#include "base/bit_utils.h"
 #include "mirror/art_method-inl.h"
 #include "quick/quick_method_frame_info.h"
-#include "utils.h"
 
 namespace art {
 namespace mips64 {
@@ -26,12 +26,8 @@
 static constexpr uintptr_t gZero = 0;
 
 void Mips64Context::Reset() {
-  for (size_t i = 0; i < kNumberOfGpuRegisters; i++) {
-    gprs_[i] = nullptr;
-  }
-  for (size_t i = 0; i < kNumberOfFpuRegisters; i++) {
-    fprs_[i] = nullptr;
-  }
+  std::fill_n(gprs_, arraysize(gprs_), nullptr);
+  std::fill_n(fprs_, arraysize(fprs_), nullptr);
   gprs_[SP] = &sp_;
   gprs_[RA] = &ra_;
   // Initialize registers with easy to spot debug values.
@@ -42,29 +38,21 @@
 void Mips64Context::FillCalleeSaves(const StackVisitor& fr) {
   mirror::ArtMethod* method = fr.GetMethod();
   const QuickMethodFrameInfo frame_info = method->GetQuickFrameInfo();
-  size_t spill_count = POPCOUNT(frame_info.CoreSpillMask());
-  size_t fp_spill_count = POPCOUNT(frame_info.FpSpillMask());
-  if (spill_count > 0) {
-    // Lowest number spill is farthest away, walk registers and fill into context.
-    int j = 1;
-    for (size_t i = 0; i < kNumberOfGpuRegisters; i++) {
-      if (((frame_info.CoreSpillMask() >> i) & 1) != 0) {
-        gprs_[i] = fr.CalleeSaveAddress(spill_count - j, frame_info.FrameSizeInBytes());
-        j++;
-      }
-    }
+  int spill_pos = 0;
+
+  // Core registers come first, from the highest down to the lowest.
+  for (uint32_t core_reg : HighToLowBits(frame_info.CoreSpillMask())) {
+    gprs_[core_reg] = fr.CalleeSaveAddress(spill_pos, frame_info.FrameSizeInBytes());
+    ++spill_pos;
   }
-  if (fp_spill_count > 0) {
-    // Lowest number spill is farthest away, walk registers and fill into context.
-    int j = 1;
-    for (size_t i = 0; i < kNumberOfFpuRegisters; i++) {
-      if (((frame_info.FpSpillMask() >> i) & 1) != 0) {
-        fprs_[i] = fr.CalleeSaveAddress(spill_count + fp_spill_count - j,
-                                        frame_info.FrameSizeInBytes());
-        j++;
-      }
-    }
+  DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask()));
+
+  // FP registers come second, from the highest down to the lowest.
+  for (uint32_t fp_reg : HighToLowBits(frame_info.FpSpillMask())) {
+    fprs_[fp_reg] = fr.CalleeSaveAddress(spill_pos, frame_info.FrameSizeInBytes());
+    ++spill_pos;
   }
+  DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask()) + POPCOUNT(frame_info.FpSpillMask()));
 }
 
 void Mips64Context::SetGPR(uint32_t reg, uintptr_t value) {
diff --git a/runtime/arch/mips64/quick_method_frame_info_mips64.h b/runtime/arch/mips64/quick_method_frame_info_mips64.h
index de55e81..f967be0 100644
--- a/runtime/arch/mips64/quick_method_frame_info_mips64.h
+++ b/runtime/arch/mips64/quick_method_frame_info_mips64.h
@@ -17,6 +17,7 @@
 #ifndef ART_RUNTIME_ARCH_MIPS64_QUICK_METHOD_FRAME_INFO_MIPS64_H_
 #define ART_RUNTIME_ARCH_MIPS64_QUICK_METHOD_FRAME_INFO_MIPS64_H_
 
+#include "base/bit_utils.h"
 #include "quick/quick_method_frame_info.h"
 #include "registers_mips64.h"
 #include "runtime.h"  // for Runtime::CalleeSaveType.
diff --git a/runtime/arch/x86/context_x86.cc b/runtime/arch/x86/context_x86.cc
index 52a35dd..7a5d0c5 100644
--- a/runtime/arch/x86/context_x86.cc
+++ b/runtime/arch/x86/context_x86.cc
@@ -16,10 +16,9 @@
 
 #include "context_x86.h"
 
+#include "base/bit_utils.h"
 #include "mirror/art_method-inl.h"
 #include "quick/quick_method_frame_info.h"
-#include "utils.h"
-
 
 namespace art {
 namespace x86 {
@@ -27,12 +26,8 @@
 static constexpr uintptr_t gZero = 0;
 
 void X86Context::Reset() {
-  for (size_t  i = 0; i < kNumberOfCpuRegisters; i++) {
-    gprs_[i] = nullptr;
-  }
-  for (size_t i = 0; i < kNumberOfFloatRegisters; ++i) {
-    fprs_[i] = nullptr;
-  }
+  std::fill_n(gprs_, arraysize(gprs_), nullptr);
+  std::fill_n(fprs_, arraysize(fprs_), nullptr);
   gprs_[ESP] = &esp_;
   // Initialize registers with easy to spot debug values.
   esp_ = X86Context::kBadGprBase + ESP;
@@ -42,36 +37,29 @@
 void X86Context::FillCalleeSaves(const StackVisitor& fr) {
   mirror::ArtMethod* method = fr.GetMethod();
   const QuickMethodFrameInfo frame_info = method->GetQuickFrameInfo();
-  size_t spill_count = POPCOUNT(frame_info.CoreSpillMask());
-  size_t fp_spill_count = POPCOUNT(frame_info.FpSpillMask());
-  if (spill_count > 0) {
-    // Lowest number spill is farthest away, walk registers and fill into context.
-    int j = 2;  // Offset j to skip return address spill.
-    for (int i = 0; i < kNumberOfCpuRegisters; i++) {
-      if (((frame_info.CoreSpillMask() >> i) & 1) != 0) {
-        gprs_[i] = fr.CalleeSaveAddress(spill_count - j, frame_info.FrameSizeInBytes());
-        j++;
-      }
-    }
+  int spill_pos = 0;
+
+  // Core registers come first, from the highest down to the lowest.
+  uint32_t core_regs =
+      frame_info.CoreSpillMask() & ~(static_cast<uint32_t>(-1) << kNumberOfCpuRegisters);
+  DCHECK_EQ(1, POPCOUNT(frame_info.CoreSpillMask() & ~core_regs));  // Return address spill.
+  for (uint32_t core_reg : HighToLowBits(core_regs)) {
+    gprs_[core_reg] = fr.CalleeSaveAddress(spill_pos, frame_info.FrameSizeInBytes());
+    ++spill_pos;
   }
-  if (fp_spill_count > 0) {
-    // Lowest number spill is farthest away, walk registers and fill into context.
-    size_t j = 2;  // Offset j to skip return address spill.
-    size_t fp_spill_size_in_words = fp_spill_count * 2;
-    for (size_t i = 0; i < kNumberOfFloatRegisters; ++i) {
-      if (((frame_info.FpSpillMask() >> i) & 1) != 0) {
-        // There are 2 pieces to each XMM register, to match VR size.
-        fprs_[2*i] = reinterpret_cast<uint32_t*>(
-            fr.CalleeSaveAddress(spill_count + fp_spill_size_in_words - j,
-                                 frame_info.FrameSizeInBytes()));
-        fprs_[2*i+1] = reinterpret_cast<uint32_t*>(
-            fr.CalleeSaveAddress(spill_count + fp_spill_size_in_words - j - 1,
-                                 frame_info.FrameSizeInBytes()));
-        // Two void* per XMM register.
-        j += 2;
-      }
-    }
+  DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask()) - 1);
+
+  // FP registers come second, from the highest down to the lowest.
+  uint32_t fp_regs = frame_info.FpSpillMask();
+  DCHECK_EQ(0u, fp_regs & (static_cast<uint32_t>(-1) << kNumberOfFloatRegisters));
+  for (uint32_t fp_reg : HighToLowBits(fp_regs)) {
+    // Two void* per XMM register.
+    fprs_[2 * fp_reg] = fr.CalleeSaveAddress(spill_pos + 1, frame_info.FrameSizeInBytes());
+    fprs_[2 * fp_reg + 1] = fr.CalleeSaveAddress(spill_pos, frame_info.FrameSizeInBytes());
+    spill_pos += 2;
   }
+  DCHECK_EQ(spill_pos,
+            POPCOUNT(frame_info.CoreSpillMask()) - 1 + 2 * POPCOUNT(frame_info.FpSpillMask()));
 }
 
 void X86Context::SmashCallerSaves() {
diff --git a/runtime/arch/x86/quick_method_frame_info_x86.h b/runtime/arch/x86/quick_method_frame_info_x86.h
index 9bba531..ed1d860 100644
--- a/runtime/arch/x86/quick_method_frame_info_x86.h
+++ b/runtime/arch/x86/quick_method_frame_info_x86.h
@@ -17,6 +17,7 @@
 #ifndef ART_RUNTIME_ARCH_X86_QUICK_METHOD_FRAME_INFO_X86_H_
 #define ART_RUNTIME_ARCH_X86_QUICK_METHOD_FRAME_INFO_X86_H_
 
+#include "base/bit_utils.h"
 #include "quick/quick_method_frame_info.h"
 #include "registers_x86.h"
 #include "runtime.h"  // for Runtime::CalleeSaveType.
diff --git a/runtime/arch/x86_64/context_x86_64.cc b/runtime/arch/x86_64/context_x86_64.cc
index 6336541..de54e14 100644
--- a/runtime/arch/x86_64/context_x86_64.cc
+++ b/runtime/arch/x86_64/context_x86_64.cc
@@ -16,9 +16,9 @@
 
 #include "context_x86_64.h"
 
+#include "base/bit_utils.h"
 #include "mirror/art_method-inl.h"
 #include "quick/quick_method_frame_info.h"
-#include "utils.h"
 
 namespace art {
 namespace x86_64 {
@@ -26,12 +26,8 @@
 static constexpr uintptr_t gZero = 0;
 
 void X86_64Context::Reset() {
-  for (size_t i = 0; i < kNumberOfCpuRegisters; ++i) {
-    gprs_[i] = nullptr;
-  }
-  for (size_t i = 0; i < kNumberOfFloatRegisters; ++i) {
-    fprs_[i] = nullptr;
-  }
+  std::fill_n(gprs_, arraysize(gprs_), nullptr);
+  std::fill_n(fprs_, arraysize(fprs_), nullptr);
   gprs_[RSP] = &rsp_;
   // Initialize registers with easy to spot debug values.
   rsp_ = X86_64Context::kBadGprBase + RSP;
@@ -41,29 +37,27 @@
 void X86_64Context::FillCalleeSaves(const StackVisitor& fr) {
   mirror::ArtMethod* method = fr.GetMethod();
   const QuickMethodFrameInfo frame_info = method->GetQuickFrameInfo();
-  size_t spill_count = POPCOUNT(frame_info.CoreSpillMask());
-  size_t fp_spill_count = POPCOUNT(frame_info.FpSpillMask());
-  if (spill_count > 0) {
-    // Lowest number spill is farthest away, walk registers and fill into context.
-    size_t j = 2;  // Offset j to skip return address spill.
-    for (size_t i = 0; i < kNumberOfCpuRegisters; ++i) {
-      if (((frame_info.CoreSpillMask() >> i) & 1) != 0) {
-        gprs_[i] = fr.CalleeSaveAddress(spill_count - j, frame_info.FrameSizeInBytes());
-        j++;
-      }
-    }
+  int spill_pos = 0;
+
+  // Core registers come first, from the highest down to the lowest.
+  uint32_t core_regs =
+      frame_info.CoreSpillMask() & ~(static_cast<uint32_t>(-1) << kNumberOfCpuRegisters);
+  DCHECK_EQ(1, POPCOUNT(frame_info.CoreSpillMask() & ~core_regs));  // Return address spill.
+  for (uint32_t core_reg : HighToLowBits(core_regs)) {
+    gprs_[core_reg] = fr.CalleeSaveAddress(spill_pos, frame_info.FrameSizeInBytes());
+    ++spill_pos;
   }
-  if (fp_spill_count > 0) {
-    // Lowest number spill is farthest away, walk registers and fill into context.
-    size_t j = 2;  // Offset j to skip return address spill.
-    for (size_t i = 0; i < kNumberOfFloatRegisters; ++i) {
-      if (((frame_info.FpSpillMask() >> i) & 1) != 0) {
-        fprs_[i] = reinterpret_cast<uint64_t*>(
-            fr.CalleeSaveAddress(spill_count + fp_spill_count - j, frame_info.FrameSizeInBytes()));
-        j++;
-      }
-    }
+  DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask()) - 1);
+
+  // FP registers come second, from the highest down to the lowest.
+  uint32_t fp_regs = frame_info.FpSpillMask();
+  DCHECK_EQ(0u, fp_regs & (static_cast<uint32_t>(-1) << kNumberOfFloatRegisters));
+  for (uint32_t fp_reg : HighToLowBits(fp_regs)) {
+    fprs_[fp_reg] = fr.CalleeSaveAddress(spill_pos, frame_info.FrameSizeInBytes());
+    ++spill_pos;
   }
+  DCHECK_EQ(spill_pos,
+            POPCOUNT(frame_info.CoreSpillMask()) - 1 + POPCOUNT(frame_info.FpSpillMask()));
 }
 
 void X86_64Context::SmashCallerSaves() {
diff --git a/runtime/arch/x86_64/quick_method_frame_info_x86_64.h b/runtime/arch/x86_64/quick_method_frame_info_x86_64.h
index 53aa212..72d7e99 100644
--- a/runtime/arch/x86_64/quick_method_frame_info_x86_64.h
+++ b/runtime/arch/x86_64/quick_method_frame_info_x86_64.h
@@ -17,6 +17,7 @@
 #ifndef ART_RUNTIME_ARCH_X86_64_QUICK_METHOD_FRAME_INFO_X86_64_H_
 #define ART_RUNTIME_ARCH_X86_64_QUICK_METHOD_FRAME_INFO_X86_64_H_
 
+#include "base/bit_utils.h"
 #include "quick/quick_method_frame_info.h"
 #include "registers_x86_64.h"
 #include "runtime.h"  // for Runtime::CalleeSaveType.
diff --git a/runtime/barrier.cc b/runtime/barrier.cc
index f80a65f..d21f551 100644
--- a/runtime/barrier.cc
+++ b/runtime/barrier.cc
@@ -17,6 +17,7 @@
 #include "barrier.h"
 
 #include "base/mutex.h"
+#include "base/time_utils.h"
 #include "thread.h"
 
 namespace art {
diff --git a/runtime/base/arena_allocator.h b/runtime/base/arena_allocator.h
index ab5968c..2e617b5 100644
--- a/runtime/base/arena_allocator.h
+++ b/runtime/base/arena_allocator.h
@@ -20,10 +20,10 @@
 #include <stdint.h>
 #include <stddef.h>
 
+#include "base/bit_utils.h"
 #include "debug_stack.h"
 #include "macros.h"
 #include "mutex.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/runtime/base/bit_utils.h b/runtime/base/bit_utils.h
new file mode 100644
index 0000000..7972158
--- /dev/null
+++ b/runtime/base/bit_utils.h
@@ -0,0 +1,337 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#ifndef ART_RUNTIME_BASE_BIT_UTILS_H_
+#define ART_RUNTIME_BASE_BIT_UTILS_H_
+
+#include <iterator>
+#include <limits>
+#include <type_traits>
+
+#include "base/logging.h"
+#include "base/iteration_range.h"
+
+namespace art {
+
+template<typename T>
+static constexpr int CLZ(T x) {
+  static_assert(std::is_integral<T>::value, "T must be integral");
+  // TODO: assert unsigned. There is currently many uses with signed values.
+  static_assert(sizeof(T) <= sizeof(long long),  // NOLINT [runtime/int] [4]
+                "T too large, must be smaller than long long");
+  return (sizeof(T) == sizeof(uint32_t))
+      ? __builtin_clz(x)  // TODO: __builtin_clz[ll] has undefined behavior for x=0
+      : __builtin_clzll(x);
+}
+
+template<typename T>
+static constexpr int CTZ(T x) {
+  static_assert(std::is_integral<T>::value, "T must be integral");
+  // TODO: assert unsigned. There is currently many uses with signed values.
+  return (sizeof(T) == sizeof(uint32_t))
+      ? __builtin_ctz(x)
+      : __builtin_ctzll(x);
+}
+
+template<typename T>
+static constexpr int POPCOUNT(T x) {
+  return (sizeof(T) == sizeof(uint32_t))
+      ? __builtin_popcount(x)
+      : __builtin_popcountll(x);
+}
+
+// Find the bit position of the most significant bit (0-based), or -1 if there were no bits set.
+template <typename T>
+static constexpr ssize_t MostSignificantBit(T value) {
+  static_assert(std::is_integral<T>::value, "T must be integral");
+  static_assert(std::is_unsigned<T>::value, "T must be unsigned");
+  static_assert(std::numeric_limits<T>::radix == 2, "Unexpected radix!");
+  return (value == 0) ? -1 : std::numeric_limits<T>::digits - 1 - CLZ(value);
+}
+
+// Find the bit position of the least significant bit (0-based), or -1 if there were no bits set.
+template <typename T>
+static constexpr ssize_t LeastSignificantBit(T value) {
+  static_assert(std::is_integral<T>::value, "T must be integral");
+  static_assert(std::is_unsigned<T>::value, "T must be unsigned");
+  return (value == 0) ? -1 : CTZ(value);
+}
+
+// How many bits (minimally) does it take to store the constant 'value'? i.e. 1 for 1, 3 for 5, etc.
+template <typename T>
+static constexpr size_t MinimumBitsToStore(T value) {
+  return static_cast<size_t>(MostSignificantBit(value) + 1);
+}
+
+template <typename T>
+static constexpr inline T RoundUpToPowerOfTwo(T x) {
+  static_assert(std::is_integral<T>::value, "T must be integral");
+  static_assert(std::is_unsigned<T>::value, "T must be unsigned");
+  // NOTE: Undefined if x > (1 << (std::numeric_limits<T>::digits - 1)).
+  return (x < 2u) ? x : static_cast<T>(1u) << (std::numeric_limits<T>::digits - CLZ(x - 1u));
+}
+
+template<typename T>
+static constexpr bool IsPowerOfTwo(T x) {
+  static_assert(std::is_integral<T>::value, "T must be integral");
+  // TODO: assert unsigned. There is currently many uses with signed values.
+  return (x & (x - 1)) == 0;
+}
+
+template<typename T>
+static inline int WhichPowerOf2(T x) {
+  static_assert(std::is_integral<T>::value, "T must be integral");
+  // TODO: assert unsigned. There is currently many uses with signed values.
+  DCHECK((x != 0) && IsPowerOfTwo(x));
+  return CTZ(x);
+}
+
+// For rounding integers.
+// NOTE: In the absence of std::omit_from_type_deduction<T> or std::identity<T>, use std::decay<T>.
+template<typename T>
+static constexpr T RoundDown(T x, typename std::decay<T>::type n) WARN_UNUSED;
+
+template<typename T>
+static constexpr T RoundDown(T x, typename std::decay<T>::type n) {
+  return
+      DCHECK_CONSTEXPR(IsPowerOfTwo(n), , T(0))
+      (x & -n);
+}
+
+template<typename T>
+static constexpr T RoundUp(T x, typename std::remove_reference<T>::type n) WARN_UNUSED;
+
+template<typename T>
+static constexpr T RoundUp(T x, typename std::remove_reference<T>::type n) {
+  return RoundDown(x + n - 1, n);
+}
+
+// For aligning pointers.
+template<typename T>
+static inline T* AlignDown(T* x, uintptr_t n) WARN_UNUSED;
+
+template<typename T>
+static inline T* AlignDown(T* x, uintptr_t n) {
+  return reinterpret_cast<T*>(RoundDown(reinterpret_cast<uintptr_t>(x), n));
+}
+
+template<typename T>
+static inline T* AlignUp(T* x, uintptr_t n) WARN_UNUSED;
+
+template<typename T>
+static inline T* AlignUp(T* x, uintptr_t n) {
+  return reinterpret_cast<T*>(RoundUp(reinterpret_cast<uintptr_t>(x), n));
+}
+
+template<int n, typename T>
+static inline bool IsAligned(T x) {
+  static_assert((n & (n - 1)) == 0, "n is not a power of two");
+  return (x & (n - 1)) == 0;
+}
+
+template<int n, typename T>
+static inline bool IsAligned(T* x) {
+  return IsAligned<n>(reinterpret_cast<const uintptr_t>(x));
+}
+
+template<typename T>
+static inline bool IsAlignedParam(T x, int n) {
+  return (x & (n - 1)) == 0;
+}
+
+#define CHECK_ALIGNED(value, alignment) \
+  CHECK(::art::IsAligned<alignment>(value)) << reinterpret_cast<const void*>(value)
+
+#define DCHECK_ALIGNED(value, alignment) \
+  DCHECK(::art::IsAligned<alignment>(value)) << reinterpret_cast<const void*>(value)
+
+#define DCHECK_ALIGNED_PARAM(value, alignment) \
+  DCHECK(::art::IsAlignedParam(value, alignment)) << reinterpret_cast<const void*>(value)
+
+// Like sizeof, but count how many bits a type takes. Pass type explicitly.
+template <typename T>
+static constexpr size_t BitSizeOf() {
+  static_assert(std::is_integral<T>::value, "T must be integral");
+  typedef typename std::make_unsigned<T>::type unsigned_type;
+  static_assert(sizeof(T) == sizeof(unsigned_type), "Unexpected type size mismatch!");
+  static_assert(std::numeric_limits<unsigned_type>::radix == 2, "Unexpected radix!");
+  return std::numeric_limits<unsigned_type>::digits;
+}
+
+// Like sizeof, but count how many bits a type takes. Infers type from parameter.
+template <typename T>
+static constexpr size_t BitSizeOf(T /*x*/) {
+  return BitSizeOf<T>();
+}
+
+static inline uint16_t Low16Bits(uint32_t value) {
+  return static_cast<uint16_t>(value);
+}
+
+static inline uint16_t High16Bits(uint32_t value) {
+  return static_cast<uint16_t>(value >> 16);
+}
+
+static inline uint32_t Low32Bits(uint64_t value) {
+  return static_cast<uint32_t>(value);
+}
+
+static inline uint32_t High32Bits(uint64_t value) {
+  return static_cast<uint32_t>(value >> 32);
+}
+
+// Check whether an N-bit two's-complement representation can hold value.
+template <typename T>
+static inline bool IsInt(size_t N, T value) {
+  if (N == BitSizeOf<T>()) {
+    return true;
+  } else {
+    CHECK_LT(0u, N);
+    CHECK_LT(N, BitSizeOf<T>());
+    T limit = static_cast<T>(1) << (N - 1u);
+    return (-limit <= value) && (value < limit);
+  }
+}
+
+template <typename T>
+static constexpr T GetIntLimit(size_t bits) {
+  return
+      DCHECK_CONSTEXPR(bits > 0, "bits cannot be zero", 0)
+      DCHECK_CONSTEXPR(bits < BitSizeOf<T>(), "kBits must be < max.", 0)
+      static_cast<T>(1) << (bits - 1);
+}
+
+template <size_t kBits, typename T>
+static constexpr bool IsInt(T value) {
+  static_assert(kBits > 0, "kBits cannot be zero.");
+  static_assert(kBits <= BitSizeOf<T>(), "kBits must be <= max.");
+  static_assert(std::is_signed<T>::value, "Needs a signed type.");
+  // Corner case for "use all bits." Can't use the limits, as they would overflow, but it is
+  // trivially true.
+  return (kBits == BitSizeOf<T>()) ?
+      true :
+      (-GetIntLimit<T>(kBits) <= value) && (value < GetIntLimit<T>(kBits));
+}
+
+template <size_t kBits, typename T>
+static constexpr bool IsUint(T value) {
+  static_assert(kBits > 0, "kBits cannot be zero.");
+  static_assert(kBits <= BitSizeOf<T>(), "kBits must be <= max.");
+  static_assert(std::is_integral<T>::value, "Needs an integral type.");
+  // Corner case for "use all bits." Can't use the limits, as they would overflow, but it is
+  // trivially true.
+  // NOTE: To avoid triggering assertion in GetIntLimit(kBits+1) if kBits+1==BitSizeOf<T>(),
+  // use GetIntLimit(kBits)*2u. The unsigned arithmetic works well for us if it overflows.
+  return (0 <= value) &&
+      (kBits == BitSizeOf<T>() ||
+          (static_cast<typename std::make_unsigned<T>::type>(value) <=
+               GetIntLimit<typename std::make_unsigned<T>::type>(kBits) * 2u - 1u));
+}
+
+template <size_t kBits, typename T>
+static constexpr bool IsAbsoluteUint(T value) {
+  static_assert(kBits <= BitSizeOf<T>(), "kBits must be <= max.");
+  static_assert(std::is_integral<T>::value, "Needs an integral type.");
+  typedef typename std::make_unsigned<T>::type unsigned_type;
+  return (kBits == BitSizeOf<T>())
+      ? true
+      : IsUint<kBits>(value < 0
+                      ? static_cast<unsigned_type>(-1 - value) + 1u  // Avoid overflow.
+                      : static_cast<unsigned_type>(value));
+}
+
+// Using the Curiously Recurring Template Pattern to implement everything shared
+// by LowToHighBitIterator and HighToLowBitIterator, i.e. everything but operator*().
+template <typename T, typename Iter>
+class BitIteratorBase
+    : public std::iterator<std::forward_iterator_tag, uint32_t, ptrdiff_t, void, void> {
+  static_assert(std::is_integral<T>::value, "T must be integral");
+  static_assert(std::is_unsigned<T>::value, "T must be unsigned");
+
+  static_assert(sizeof(T) == sizeof(uint32_t) || sizeof(T) == sizeof(uint64_t), "Unsupported size");
+
+ public:
+  BitIteratorBase() : bits_(0u) { }
+  explicit BitIteratorBase(T bits) : bits_(bits) { }
+
+  Iter& operator++() {
+    DCHECK_NE(bits_, 0u);
+    uint32_t bit = *static_cast<Iter&>(*this);
+    bits_ &= ~(static_cast<T>(1u) << bit);
+    return static_cast<Iter&>(*this);
+  }
+
+  Iter& operator++(int) {
+    Iter tmp(static_cast<Iter&>(*this));
+    ++*this;
+    return tmp;
+  }
+
+ protected:
+  T bits_;
+
+  template <typename U, typename I>
+  friend bool operator==(const BitIteratorBase<U, I>& lhs, const BitIteratorBase<U, I>& rhs);
+};
+
+template <typename T, typename Iter>
+bool operator==(const BitIteratorBase<T, Iter>& lhs, const BitIteratorBase<T, Iter>& rhs) {
+  return lhs.bits_ == rhs.bits_;
+}
+
+template <typename T, typename Iter>
+bool operator!=(const BitIteratorBase<T, Iter>& lhs, const BitIteratorBase<T, Iter>& rhs) {
+  return !(lhs == rhs);
+}
+
+template <typename T>
+class LowToHighBitIterator : public BitIteratorBase<T, LowToHighBitIterator<T>> {
+ public:
+  using BitIteratorBase<T, LowToHighBitIterator<T>>::BitIteratorBase;
+
+  uint32_t operator*() const {
+    DCHECK_NE(this->bits_, 0u);
+    return CTZ(this->bits_);
+  }
+};
+
+template <typename T>
+class HighToLowBitIterator : public BitIteratorBase<T, HighToLowBitIterator<T>> {
+ public:
+  using BitIteratorBase<T, HighToLowBitIterator<T>>::BitIteratorBase;
+
+  uint32_t operator*() const {
+    DCHECK_NE(this->bits_, 0u);
+    static_assert(std::numeric_limits<T>::radix == 2, "Unexpected radix!");
+    return std::numeric_limits<T>::digits - 1u - CLZ(this->bits_);
+  }
+};
+
+template <typename T>
+IterationRange<LowToHighBitIterator<T>> LowToHighBits(T bits) {
+  return IterationRange<LowToHighBitIterator<T>>(
+      LowToHighBitIterator<T>(bits), LowToHighBitIterator<T>());
+}
+
+template <typename T>
+IterationRange<HighToLowBitIterator<T>> HighToLowBits(T bits) {
+  return IterationRange<HighToLowBitIterator<T>>(
+      HighToLowBitIterator<T>(bits), HighToLowBitIterator<T>());
+}
+
+}  // namespace art
+
+#endif  // ART_RUNTIME_BASE_BIT_UTILS_H_
diff --git a/runtime/base/bit_utils_test.cc b/runtime/base/bit_utils_test.cc
new file mode 100644
index 0000000..77bd0b8
--- /dev/null
+++ b/runtime/base/bit_utils_test.cc
@@ -0,0 +1,400 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#include <vector>
+
+#include "bit_utils.h"
+
+#include "gtest/gtest.h"
+
+namespace art {
+
+// NOTE: CLZ(0u) is undefined.
+static_assert(31 == CLZ<uint32_t>(1u), "TestCLZ32#1");
+static_assert(30 == CLZ<uint32_t>(2u), "TestCLZ32#2");
+static_assert(16 == CLZ<uint32_t>(0x00008765u), "TestCLZ32#3");
+static_assert(15 == CLZ<uint32_t>(0x00012345u), "TestCLZ32#4");
+static_assert(1 == CLZ<uint32_t>(0x43214321u), "TestCLZ32#5");
+static_assert(0 == CLZ<uint32_t>(0x87654321u), "TestCLZ32#6");
+
+// NOTE: CLZ(0ull) is undefined.
+static_assert(63 == CLZ<uint64_t>(UINT64_C(1)), "TestCLZ64#1");
+static_assert(62 == CLZ<uint64_t>(UINT64_C(3)), "TestCLZ64#2");
+static_assert(48 == CLZ<uint64_t>(UINT64_C(0x00008765)), "TestCLZ64#3");
+static_assert(32 == CLZ<uint64_t>(UINT64_C(0x87654321)), "TestCLZ64#4");
+static_assert(31 == CLZ<uint64_t>(UINT64_C(0x123456789)), "TestCLZ64#5");
+static_assert(16 == CLZ<uint64_t>(UINT64_C(0x876543211234)), "TestCLZ64#6");
+static_assert(1 == CLZ<uint64_t>(UINT64_C(0x4321432187654321)), "TestCLZ64#7");
+static_assert(0 == CLZ<uint64_t>(UINT64_C(0x8765432187654321)), "TestCLZ64#8");
+
+// NOTE: CTZ(0u) is undefined.
+static_assert(0 == CTZ<uint32_t>(1u), "TestCTZ32#1");
+static_assert(1 == CTZ<uint32_t>(2u), "TestCTZ32#2");
+static_assert(15 == CTZ<uint32_t>(0x45678000u), "TestCTZ32#3");
+static_assert(16 == CTZ<uint32_t>(0x43210000u), "TestCTZ32#4");
+static_assert(30 == CTZ<uint32_t>(0xc0000000u), "TestCTZ32#5");
+static_assert(31 == CTZ<uint32_t>(0x80000000u), "TestCTZ32#6");
+
+// NOTE: CTZ(0ull) is undefined.
+static_assert(0 == CTZ<uint64_t>(UINT64_C(1)), "TestCTZ64#1");
+static_assert(1 == CTZ<uint64_t>(UINT64_C(2)), "TestCTZ64#2");
+static_assert(16 == CTZ<uint64_t>(UINT64_C(0x43210000)), "TestCTZ64#3");
+static_assert(31 == CTZ<uint64_t>(UINT64_C(0x80000000)), "TestCTZ64#4");
+static_assert(32 == CTZ<uint64_t>(UINT64_C(0x8765432100000000)), "TestCTZ64#5");
+static_assert(48 == CTZ<uint64_t>(UINT64_C(0x4321000000000000)), "TestCTZ64#6");
+static_assert(62 == CTZ<uint64_t>(UINT64_C(0x4000000000000000)), "TestCTZ64#7");
+static_assert(63 == CTZ<uint64_t>(UINT64_C(0x8000000000000000)), "TestCTZ64#8");
+
+static_assert(0 == POPCOUNT<uint32_t>(0u), "TestPOPCOUNT32#1");
+static_assert(1 == POPCOUNT<uint32_t>(8u), "TestPOPCOUNT32#2");
+static_assert(15 == POPCOUNT<uint32_t>(0x55555554u), "TestPOPCOUNT32#3");
+static_assert(16 == POPCOUNT<uint32_t>(0xaaaaaaaau), "TestPOPCOUNT32#4");
+static_assert(31 == POPCOUNT<uint32_t>(0xfffffffeu), "TestPOPCOUNT32#5");
+static_assert(32 == POPCOUNT<uint32_t>(0xffffffffu), "TestPOPCOUNT32#6");
+
+static_assert(0 == POPCOUNT<uint64_t>(UINT64_C(0)), "TestPOPCOUNT64#1");
+static_assert(1 == POPCOUNT<uint64_t>(UINT64_C(0x40000)), "TestPOPCOUNT64#2");
+static_assert(16 == POPCOUNT<uint64_t>(UINT64_C(0x1414141482828282)), "TestPOPCOUNT64#3");
+static_assert(31 == POPCOUNT<uint64_t>(UINT64_C(0x0000ffff00007fff)), "TestPOPCOUNT64#4");
+static_assert(32 == POPCOUNT<uint64_t>(UINT64_C(0x5555555555555555)), "TestPOPCOUNT64#5");
+static_assert(48 == POPCOUNT<uint64_t>(UINT64_C(0x7777bbbbddddeeee)), "TestPOPCOUNT64#6");
+static_assert(63 == POPCOUNT<uint64_t>(UINT64_C(0x7fffffffffffffff)), "TestPOPCOUNT64#7");
+static_assert(64 == POPCOUNT<uint64_t>(UINT64_C(0xffffffffffffffff)), "TestPOPCOUNT64#8");
+
+static_assert(-1 == MostSignificantBit<uint32_t>(0u), "TestMSB32#1");
+static_assert(0 == MostSignificantBit<uint32_t>(1u), "TestMSB32#2");
+static_assert(31 == MostSignificantBit<uint32_t>(~static_cast<uint32_t>(0u)), "TestMSB32#3");
+static_assert(2 == MostSignificantBit<uint32_t>(0b110), "TestMSB32#4");
+static_assert(2 == MostSignificantBit<uint32_t>(0b100), "TestMSB32#5");
+
+static_assert(-1 == MostSignificantBit<uint64_t>(UINT64_C(0)), "TestMSB64#1");
+static_assert(0 == MostSignificantBit<uint64_t>(UINT64_C(1)), "TestMSB64#2");
+static_assert(63 == MostSignificantBit<uint64_t>(~UINT64_C(0)), "TestMSB64#3");
+static_assert(34 == MostSignificantBit<uint64_t>(UINT64_C(0x700000000)), "TestMSB64#4");
+static_assert(34 == MostSignificantBit<uint64_t>(UINT64_C(0x777777777)), "TestMSB64#5");
+
+static_assert(-1 == LeastSignificantBit<uint32_t>(0u), "TestLSB32#1");
+static_assert(0 == LeastSignificantBit<uint32_t>(1u), "TestLSB32#1");
+static_assert(0 == LeastSignificantBit<uint32_t>(~static_cast<uint32_t>(0u)), "TestLSB32#1");
+static_assert(1 == LeastSignificantBit<uint32_t>(0b110), "TestLSB32#1");
+static_assert(2 == LeastSignificantBit<uint32_t>(0b100), "TestLSB32#1");
+
+static_assert(-1 == LeastSignificantBit<uint64_t>(UINT64_C(0)), "TestLSB64#1");
+static_assert(0 == LeastSignificantBit<uint64_t>(UINT64_C(1)), "TestLSB64#2");
+static_assert(0 == LeastSignificantBit<uint64_t>(~UINT64_C(0)), "TestLSB64#3");
+static_assert(12 == LeastSignificantBit<uint64_t>(UINT64_C(0x5000)), "TestLSB64#4");
+static_assert(48 == LeastSignificantBit<uint64_t>(UINT64_C(0x5555000000000000)), "TestLSB64#5");
+
+static_assert(0u == MinimumBitsToStore<uint32_t>(0u), "TestMinBits2Store32#1");
+static_assert(1u == MinimumBitsToStore<uint32_t>(1u), "TestMinBits2Store32#2");
+static_assert(2u == MinimumBitsToStore<uint32_t>(0b10u), "TestMinBits2Store32#3");
+static_assert(2u == MinimumBitsToStore<uint32_t>(0b11u), "TestMinBits2Store32#4");
+static_assert(3u == MinimumBitsToStore<uint32_t>(0b100u), "TestMinBits2Store32#5");
+static_assert(3u == MinimumBitsToStore<uint32_t>(0b110u), "TestMinBits2Store32#6");
+static_assert(3u == MinimumBitsToStore<uint32_t>(0b101u), "TestMinBits2Store32#7");
+static_assert(8u == MinimumBitsToStore<uint32_t>(0xFFu), "TestMinBits2Store32#8");
+static_assert(32u == MinimumBitsToStore<uint32_t>(~static_cast<uint32_t>(0u)),
+              "TestMinBits2Store32#9");
+
+static_assert(0u == MinimumBitsToStore<uint64_t>(UINT64_C(0)), "TestMinBits2Store64#1");
+static_assert(1u == MinimumBitsToStore<uint64_t>(UINT64_C(1)), "TestMinBits2Store64#2");
+static_assert(2u == MinimumBitsToStore<uint64_t>(UINT64_C(0b10)), "TestMinBits2Store64#3");
+static_assert(2u == MinimumBitsToStore<uint64_t>(UINT64_C(0b11)), "TestMinBits2Store64#4");
+static_assert(3u == MinimumBitsToStore<uint64_t>(UINT64_C(0b100)), "TestMinBits2Store64#5");
+static_assert(3u == MinimumBitsToStore<uint64_t>(UINT64_C(0b110)), "TestMinBits2Store64#6");
+static_assert(3u == MinimumBitsToStore<uint64_t>(UINT64_C(0b101)), "TestMinBits2Store64#7");
+static_assert(8u == MinimumBitsToStore<uint64_t>(UINT64_C(0xFF)), "TestMinBits2Store64#8");
+static_assert(32u == MinimumBitsToStore<uint64_t>(UINT64_C(0xFFFFFFFF)), "TestMinBits2Store64#9");
+static_assert(33u == MinimumBitsToStore<uint64_t>(UINT64_C(0x1FFFFFFFF)), "TestMinBits2Store64#10");
+static_assert(64u == MinimumBitsToStore<uint64_t>(~UINT64_C(0)), "TestMinBits2Store64#11");
+
+static_assert(0 == RoundUpToPowerOfTwo<uint32_t>(0u), "TestRoundUpPowerOfTwo32#1");
+static_assert(1 == RoundUpToPowerOfTwo<uint32_t>(1u), "TestRoundUpPowerOfTwo32#2");
+static_assert(2 == RoundUpToPowerOfTwo<uint32_t>(2u), "TestRoundUpPowerOfTwo32#3");
+static_assert(4 == RoundUpToPowerOfTwo<uint32_t>(3u), "TestRoundUpPowerOfTwo32#4");
+static_assert(8 == RoundUpToPowerOfTwo<uint32_t>(7u), "TestRoundUpPowerOfTwo32#5");
+static_assert(0x40000u == RoundUpToPowerOfTwo<uint32_t>(0x2aaaau),
+              "TestRoundUpPowerOfTwo32#6");
+static_assert(0x80000000u == RoundUpToPowerOfTwo<uint32_t>(0x40000001u),
+              "TestRoundUpPowerOfTwo32#7");
+static_assert(0x80000000u == RoundUpToPowerOfTwo<uint32_t>(0x80000000u),
+              "TestRoundUpPowerOfTwo32#8");
+
+static_assert(0 == RoundUpToPowerOfTwo<uint64_t>(UINT64_C(0)), "TestRoundUpPowerOfTwo64#1");
+static_assert(1 == RoundUpToPowerOfTwo<uint64_t>(UINT64_C(1)), "TestRoundUpPowerOfTwo64#2");
+static_assert(2 == RoundUpToPowerOfTwo<uint64_t>(UINT64_C(2)), "TestRoundUpPowerOfTwo64#3");
+static_assert(4 == RoundUpToPowerOfTwo<uint64_t>(UINT64_C(3)), "TestRoundUpPowerOfTwo64#4");
+static_assert(8 == RoundUpToPowerOfTwo<uint64_t>(UINT64_C(7)), "TestRoundUpPowerOfTwo64#5");
+static_assert(UINT64_C(0x40000) == RoundUpToPowerOfTwo<uint64_t>(UINT64_C(0x2aaaa)),
+              "TestRoundUpPowerOfTwo64#6");
+static_assert(
+    UINT64_C(0x8000000000000000) == RoundUpToPowerOfTwo<uint64_t>(UINT64_C(0x4000000000000001)),
+    "TestRoundUpPowerOfTwo64#7");
+static_assert(
+    UINT64_C(0x8000000000000000) == RoundUpToPowerOfTwo<uint64_t>(UINT64_C(0x8000000000000000)),
+    "TestRoundUpPowerOfTwo64#8");
+
+static constexpr int64_t kInt32MinMinus1 =
+    static_cast<int64_t>(std::numeric_limits<int32_t>::min()) - 1;
+static constexpr int64_t kInt32MaxPlus1 =
+    static_cast<int64_t>(std::numeric_limits<int32_t>::max()) + 1;
+static constexpr int64_t kUint32MaxPlus1 =
+    static_cast<int64_t>(std::numeric_limits<uint32_t>::max()) + 1;
+
+TEST(BitUtilsTest, TestIsInt32) {
+  EXPECT_FALSE(IsInt<int32_t>(1, -2));
+  EXPECT_TRUE(IsInt<int32_t>(1, -1));
+  EXPECT_TRUE(IsInt<int32_t>(1, 0));
+  EXPECT_FALSE(IsInt<int32_t>(1, 1));
+  EXPECT_FALSE(IsInt<int32_t>(4, -9));
+  EXPECT_TRUE(IsInt<int32_t>(4, -8));
+  EXPECT_TRUE(IsInt<int32_t>(4, 7));
+  EXPECT_FALSE(IsInt<int32_t>(4, 8));
+  EXPECT_FALSE(IsInt<int32_t>(31, std::numeric_limits<int32_t>::min()));
+  EXPECT_FALSE(IsInt<int32_t>(31, std::numeric_limits<int32_t>::max()));
+  EXPECT_TRUE(IsInt<int32_t>(32, std::numeric_limits<int32_t>::min()));
+  EXPECT_TRUE(IsInt<int32_t>(32, std::numeric_limits<int32_t>::max()));
+}
+
+TEST(BitUtilsTest, TestIsInt64) {
+  EXPECT_FALSE(IsInt<int64_t>(1, -2));
+  EXPECT_TRUE(IsInt<int64_t>(1, -1));
+  EXPECT_TRUE(IsInt<int64_t>(1, 0));
+  EXPECT_FALSE(IsInt<int64_t>(1, 1));
+  EXPECT_FALSE(IsInt<int64_t>(4, -9));
+  EXPECT_TRUE(IsInt<int64_t>(4, -8));
+  EXPECT_TRUE(IsInt<int64_t>(4, 7));
+  EXPECT_FALSE(IsInt<int64_t>(4, 8));
+  EXPECT_FALSE(IsInt<int64_t>(31, std::numeric_limits<int32_t>::min()));
+  EXPECT_FALSE(IsInt<int64_t>(31, std::numeric_limits<int32_t>::max()));
+  EXPECT_TRUE(IsInt<int64_t>(32, std::numeric_limits<int32_t>::min()));
+  EXPECT_TRUE(IsInt<int64_t>(32, std::numeric_limits<int32_t>::max()));
+  EXPECT_FALSE(IsInt<int64_t>(32, kInt32MinMinus1));
+  EXPECT_FALSE(IsInt<int64_t>(32, kInt32MaxPlus1));
+  EXPECT_FALSE(IsInt<int64_t>(63, std::numeric_limits<int64_t>::min()));
+  EXPECT_FALSE(IsInt<int64_t>(63, std::numeric_limits<int64_t>::max()));
+  EXPECT_TRUE(IsInt<int64_t>(64, std::numeric_limits<int64_t>::min()));
+  EXPECT_TRUE(IsInt<int64_t>(64, std::numeric_limits<int64_t>::max()));
+}
+
+static_assert(!IsInt<1, int32_t>(-2), "TestIsInt32#1");
+static_assert(IsInt<1, int32_t>(-1), "TestIsInt32#2");
+static_assert(IsInt<1, int32_t>(0), "TestIsInt32#3");
+static_assert(!IsInt<1, int32_t>(1), "TestIsInt32#4");
+static_assert(!IsInt<4, int32_t>(-9), "TestIsInt32#5");
+static_assert(IsInt<4, int32_t>(-8), "TestIsInt32#6");
+static_assert(IsInt<4, int32_t>(7), "TestIsInt32#7");
+static_assert(!IsInt<4, int32_t>(8), "TestIsInt32#8");
+static_assert(!IsInt<31, int32_t>(std::numeric_limits<int32_t>::min()), "TestIsInt32#9");
+static_assert(!IsInt<31, int32_t>(std::numeric_limits<int32_t>::max()), "TestIsInt32#10");
+static_assert(IsInt<32, int32_t>(std::numeric_limits<int32_t>::min()), "TestIsInt32#11");
+static_assert(IsInt<32, int32_t>(std::numeric_limits<int32_t>::max()), "TestIsInt32#12");
+
+static_assert(!IsInt<1, int64_t>(-2), "TestIsInt64#1");
+static_assert(IsInt<1, int64_t>(-1), "TestIsInt64#2");
+static_assert(IsInt<1, int64_t>(0), "TestIsInt64#3");
+static_assert(!IsInt<1, int64_t>(1), "TestIsInt64#4");
+static_assert(!IsInt<4, int64_t>(-9), "TestIsInt64#5");
+static_assert(IsInt<4, int64_t>(-8), "TestIsInt64#6");
+static_assert(IsInt<4, int64_t>(7), "TestIsInt64#7");
+static_assert(!IsInt<4, int64_t>(8), "TestIsInt64#8");
+static_assert(!IsInt<31, int64_t>(std::numeric_limits<int32_t>::min()), "TestIsInt64#9");
+static_assert(!IsInt<31, int64_t>(std::numeric_limits<int32_t>::max()), "TestIsInt64#10");
+static_assert(IsInt<32, int64_t>(std::numeric_limits<int32_t>::min()), "TestIsInt64#11");
+static_assert(IsInt<32, int64_t>(std::numeric_limits<int32_t>::max()), "TestIsInt64#12");
+static_assert(!IsInt<32, int64_t>(kInt32MinMinus1), "TestIsInt64#13");
+static_assert(!IsInt<32, int64_t>(kInt32MaxPlus1), "TestIsInt64#14");
+static_assert(!IsInt<63, int64_t>(std::numeric_limits<int64_t>::min()), "TestIsInt64#15");
+static_assert(!IsInt<63, int64_t>(std::numeric_limits<int64_t>::max()), "TestIsInt64#16");
+static_assert(IsInt<64, int64_t>(std::numeric_limits<int64_t>::min()), "TestIsInt64#17");
+static_assert(IsInt<64, int64_t>(std::numeric_limits<int64_t>::max()), "TestIsInt64#18");
+
+static_assert(!IsUint<1, int32_t>(-1), "TestIsUint32#1");
+static_assert(IsUint<1, int32_t>(0), "TestIsUint32#2");
+static_assert(IsUint<1, int32_t>(1), "TestIsUint32#3");
+static_assert(!IsUint<1, int32_t>(2), "TestIsUint32#4");
+static_assert(!IsUint<4, int32_t>(-1), "TestIsUint32#5");
+static_assert(IsUint<4, int32_t>(0), "TestIsUint32#6");
+static_assert(IsUint<4, int32_t>(15), "TestIsUint32#7");
+static_assert(!IsUint<4, int32_t>(16), "TestIsUint32#8");
+static_assert(!IsUint<30, int32_t>(std::numeric_limits<int32_t>::max()), "TestIsUint32#9");
+static_assert(IsUint<31, int32_t>(std::numeric_limits<int32_t>::max()), "TestIsUint32#10");
+static_assert(!IsUint<32, int32_t>(-1), "TestIsUint32#11");
+static_assert(IsUint<32, int32_t>(0), "TestIsUint32#11");
+static_assert(IsUint<32, uint32_t>(static_cast<uint32_t>(-1)), "TestIsUint32#12");
+
+static_assert(!IsUint<1, int64_t>(-1), "TestIsUint64#1");
+static_assert(IsUint<1, int64_t>(0), "TestIsUint64#2");
+static_assert(IsUint<1, int64_t>(1), "TestIsUint64#3");
+static_assert(!IsUint<1, int64_t>(2), "TestIsUint64#4");
+static_assert(!IsUint<4, int64_t>(-1), "TestIsUint64#5");
+static_assert(IsUint<4, int64_t>(0), "TestIsUint64#6");
+static_assert(IsUint<4, int64_t>(15), "TestIsUint64#7");
+static_assert(!IsUint<4, int64_t>(16), "TestIsUint64#8");
+static_assert(!IsUint<30, int64_t>(std::numeric_limits<int32_t>::max()), "TestIsUint64#9");
+static_assert(IsUint<31, int64_t>(std::numeric_limits<int32_t>::max()), "TestIsUint64#10");
+static_assert(!IsUint<62, int64_t>(std::numeric_limits<int64_t>::max()), "TestIsUint64#11");
+static_assert(IsUint<63, int64_t>(std::numeric_limits<int64_t>::max()), "TestIsUint64#12");
+static_assert(!IsUint<64, int64_t>(-1), "TestIsUint64#13");
+static_assert(IsUint<64, int64_t>(0), "TestIsUint64#14");
+static_assert(IsUint<64, uint64_t>(static_cast<uint32_t>(-1)), "TestIsUint64#15");
+
+static_assert(!IsAbsoluteUint<1, int32_t>(-2), "TestIsAbsoluteUint32#1");
+static_assert(IsAbsoluteUint<1, int32_t>(-1), "TestIsAbsoluteUint32#2");
+static_assert(IsAbsoluteUint<1, int32_t>(0), "TestIsAbsoluteUint32#3");
+static_assert(IsAbsoluteUint<1, int32_t>(1), "TestIsAbsoluteUint32#4");
+static_assert(!IsAbsoluteUint<1, int32_t>(2), "TestIsAbsoluteUint32#5");
+static_assert(!IsAbsoluteUint<4, int32_t>(-16), "TestIsAbsoluteUint32#6");
+static_assert(IsAbsoluteUint<4, int32_t>(-15), "TestIsAbsoluteUint32#7");
+static_assert(IsAbsoluteUint<4, int32_t>(0), "TestIsAbsoluteUint32#8");
+static_assert(IsAbsoluteUint<4, int32_t>(15), "TestIsAbsoluteUint32#9");
+static_assert(!IsAbsoluteUint<4, int32_t>(16), "TestIsAbsoluteUint32#10");
+static_assert(!IsAbsoluteUint<30, int32_t>(std::numeric_limits<int32_t>::max()),
+              "TestIsAbsoluteUint32#11");
+static_assert(IsAbsoluteUint<31, int32_t>(std::numeric_limits<int32_t>::max()),
+              "TestIsAbsoluteUint32#12");
+static_assert(!IsAbsoluteUint<31, int32_t>(std::numeric_limits<int32_t>::min()),
+              "TestIsAbsoluteUint32#13");
+static_assert(IsAbsoluteUint<31, int32_t>(std::numeric_limits<int32_t>::min() + 1),
+              "TestIsAbsoluteUint32#14");
+static_assert(IsAbsoluteUint<32, int32_t>(std::numeric_limits<int32_t>::max()),
+              "TestIsAbsoluteUint32#15");
+static_assert(IsAbsoluteUint<32, int32_t>(std::numeric_limits<int32_t>::min()),
+              "TestIsAbsoluteUint32#16");
+static_assert(IsAbsoluteUint<32, int32_t>(0), "TestIsAbsoluteUint32#17");
+
+static_assert(!IsAbsoluteUint<1, int64_t>(-2), "TestIsAbsoluteUint64#1");
+static_assert(IsAbsoluteUint<1, int64_t>(-1), "TestIsAbsoluteUint64#2");
+static_assert(IsAbsoluteUint<1, int64_t>(0), "TestIsAbsoluteUint64#3");
+static_assert(IsAbsoluteUint<1, int64_t>(1), "TestIsAbsoluteUint64#4");
+static_assert(!IsAbsoluteUint<1, int64_t>(2), "TestIsAbsoluteUint64#5");
+static_assert(!IsAbsoluteUint<4, int64_t>(-16), "TestIsAbsoluteUint64#6");
+static_assert(IsAbsoluteUint<4, int64_t>(-15), "TestIsAbsoluteUint64#7");
+static_assert(IsAbsoluteUint<4, int64_t>(0), "TestIsAbsoluteUint64#8");
+static_assert(IsAbsoluteUint<4, int64_t>(15), "TestIsAbsoluteUint64#9");
+static_assert(!IsAbsoluteUint<4, int64_t>(16), "TestIsAbsoluteUint64#10");
+static_assert(!IsAbsoluteUint<30, int64_t>(std::numeric_limits<int32_t>::max()),
+              "TestIsAbsoluteUint64#11");
+static_assert(IsAbsoluteUint<31, int64_t>(std::numeric_limits<int32_t>::max()),
+              "TestIsAbsoluteUint64#12");
+static_assert(!IsAbsoluteUint<31, int64_t>(std::numeric_limits<int32_t>::min()),
+              "TestIsAbsoluteUint64#13");
+static_assert(IsAbsoluteUint<31, int64_t>(std::numeric_limits<int32_t>::min() + 1),
+              "TestIsAbsoluteUint64#14");
+static_assert(IsAbsoluteUint<32, int64_t>(std::numeric_limits<int32_t>::max()),
+              "TestIsAbsoluteUint64#15");
+static_assert(IsAbsoluteUint<32, int64_t>(std::numeric_limits<int32_t>::min()),
+              "TestIsAbsoluteUint64#16");
+static_assert(!IsAbsoluteUint<62, int64_t>(std::numeric_limits<int64_t>::max()),
+              "TestIsAbsoluteUint64#17");
+static_assert(IsAbsoluteUint<63, int64_t>(std::numeric_limits<int64_t>::max()),
+              "TestIsAbsoluteUint64#18");
+static_assert(!IsAbsoluteUint<63, int64_t>(std::numeric_limits<int64_t>::min()),
+              "TestIsAbsoluteUint64#19");
+static_assert(IsAbsoluteUint<63, int64_t>(std::numeric_limits<int64_t>::min() + 1),
+              "TestIsAbsoluteUint64#20");
+static_assert(IsAbsoluteUint<64, int64_t>(std::numeric_limits<int64_t>::max()),
+              "TestIsAbsoluteUint64#21");
+static_assert(IsAbsoluteUint<64, int64_t>(std::numeric_limits<int64_t>::min()),
+              "TestIsAbsoluteUint64#22");
+static_assert(!IsAbsoluteUint<32, int64_t>(-kUint32MaxPlus1), "TestIsAbsoluteUint64#23");
+static_assert(IsAbsoluteUint<32, int64_t>(-kUint32MaxPlus1 + 1), "TestIsAbsoluteUint64#24");
+static_assert(IsAbsoluteUint<32, int64_t>(0), "TestIsAbsoluteUint64#25");
+static_assert(IsAbsoluteUint<64, int64_t>(0), "TestIsAbsoluteUint64#26");
+static_assert(IsAbsoluteUint<32, int64_t>(std::numeric_limits<uint32_t>::max()),
+              "TestIsAbsoluteUint64#27");
+static_assert(!IsAbsoluteUint<32, int64_t>(kUint32MaxPlus1), "TestIsAbsoluteUint64#28");
+
+template <typename Container>
+void CheckElements(const std::initializer_list<uint32_t>& expected, const Container& elements) {
+  auto expected_it = expected.begin();
+  auto element_it = elements.begin();
+  size_t idx = 0u;
+  while (expected_it != expected.end() && element_it != elements.end()) {
+    EXPECT_EQ(*expected_it, *element_it) << idx;
+    ++idx;
+    ++expected_it;
+    ++element_it;
+  }
+  ASSERT_TRUE(expected_it == expected.end() && element_it == elements.end())
+      << std::boolalpha << (expected_it == expected.end()) << " " << (element_it == elements.end());
+}
+
+TEST(BitUtilsTest, TestLowToHighBits32) {
+  CheckElements({}, LowToHighBits<uint32_t>(0u));
+  CheckElements({0}, LowToHighBits<uint32_t>(1u));
+  CheckElements({15}, LowToHighBits<uint32_t>(0x8000u));
+  CheckElements({31}, LowToHighBits<uint32_t>(0x80000000u));
+  CheckElements({0, 31}, LowToHighBits<uint32_t>(0x80000001u));
+  CheckElements({0, 1, 2, 3, 4, 5, 6, 7, 31}, LowToHighBits<uint32_t>(0x800000ffu));
+  CheckElements({0, 8, 16, 24, 31}, LowToHighBits<uint32_t>(0x81010101u));
+  CheckElements({16, 17, 30, 31}, LowToHighBits<uint32_t>(0xc0030000u));
+  CheckElements({0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+                 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31},
+                LowToHighBits<uint32_t>(0xffffffffu));
+}
+
+TEST(BitUtilsTest, TestLowToHighBits64) {
+  CheckElements({}, LowToHighBits<uint64_t>(UINT64_C(0)));
+  CheckElements({0}, LowToHighBits<uint64_t>(UINT64_C(1)));
+  CheckElements({32}, LowToHighBits<uint64_t>(UINT64_C(0x100000000)));
+  CheckElements({63}, LowToHighBits<uint64_t>(UINT64_C(0x8000000000000000)));
+  CheckElements({0, 63}, LowToHighBits<uint64_t>(UINT64_C(0x8000000000000001)));
+  CheckElements({0, 1, 2, 3, 4, 5, 6, 7, 63},
+                LowToHighBits<uint64_t>(UINT64_C(0x80000000000000ff)));
+  CheckElements({0, 8, 16, 24, 32, 40, 48, 56, 63},
+                LowToHighBits<uint64_t>(UINT64_C(0x8101010101010101)));
+  CheckElements({16, 17, 62, 63}, LowToHighBits<uint64_t>(UINT64_C(0xc000000000030000)));
+  CheckElements({0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+                 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
+                 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
+                 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63},
+                LowToHighBits<uint64_t>(UINT64_C(0xffffffffffffffff)));
+}
+
+TEST(BitUtilsTest, TestHighToLowBits32) {
+  CheckElements({}, HighToLowBits<uint32_t>(0u));
+  CheckElements({0}, HighToLowBits<uint32_t>(1u));
+  CheckElements({15}, HighToLowBits<uint32_t>(0x8000u));
+  CheckElements({31}, HighToLowBits<uint32_t>(0x80000000u));
+  CheckElements({31, 0}, HighToLowBits<uint32_t>(0x80000001u));
+  CheckElements({31, 7, 6, 5, 4, 3, 2, 1, 0}, HighToLowBits<uint32_t>(0x800000ffu));
+  CheckElements({31, 24, 16, 8, 0}, HighToLowBits<uint32_t>(0x81010101u));
+  CheckElements({31, 30, 17, 16}, HighToLowBits<uint32_t>(0xc0030000u));
+  CheckElements({31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16,
+                 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0},
+                HighToLowBits<uint32_t>(0xffffffffu));
+}
+
+TEST(BitUtilsTest, TestHighToLowBits64) {
+  CheckElements({}, HighToLowBits<uint64_t>(UINT64_C(0)));
+  CheckElements({0}, HighToLowBits<uint64_t>(UINT64_C(1)));
+  CheckElements({32}, HighToLowBits<uint64_t>(UINT64_C(0x100000000)));
+  CheckElements({63}, HighToLowBits<uint64_t>(UINT64_C(0x8000000000000000)));
+  CheckElements({63, 0}, HighToLowBits<uint64_t>(UINT64_C(0x8000000000000001)));
+  CheckElements({63, 7, 6, 5, 4, 3, 2, 1, 0},
+                HighToLowBits<uint64_t>(UINT64_C(0x80000000000000ff)));
+  CheckElements({63, 56, 48, 40, 32, 24, 16, 8, 0},
+                HighToLowBits<uint64_t>(UINT64_C(0x8101010101010101)));
+  CheckElements({63, 62, 17, 16}, HighToLowBits<uint64_t>(UINT64_C(0xc000000000030000)));
+  CheckElements({63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48,
+                 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32,
+                 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16,
+                 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0},
+                HighToLowBits<uint64_t>(UINT64_C(0xffffffffffffffff)));
+}
+
+}  // namespace art
diff --git a/runtime/base/bit_vector-inl.h b/runtime/base/bit_vector-inl.h
index 39b19e5..0887798 100644
--- a/runtime/base/bit_vector-inl.h
+++ b/runtime/base/bit_vector-inl.h
@@ -17,9 +17,9 @@
 #ifndef ART_RUNTIME_BASE_BIT_VECTOR_INL_H_
 #define ART_RUNTIME_BASE_BIT_VECTOR_INL_H_
 
+#include "base/bit_utils.h"
 #include "bit_vector.h"
 #include "logging.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/runtime/base/bit_vector.h b/runtime/base/bit_vector.h
index 6e4367a..17835f5 100644
--- a/runtime/base/bit_vector.h
+++ b/runtime/base/bit_vector.h
@@ -20,7 +20,7 @@
 #include <stdint.h>
 #include <iterator>
 
-#include "utils.h"
+#include "base/bit_utils.h"
 
 namespace art {
 
diff --git a/runtime/base/bounded_fifo.h b/runtime/base/bounded_fifo.h
index d04840a..7bcd382 100644
--- a/runtime/base/bounded_fifo.h
+++ b/runtime/base/bounded_fifo.h
@@ -17,16 +17,19 @@
 #ifndef ART_RUNTIME_BASE_BOUNDED_FIFO_H_
 #define ART_RUNTIME_BASE_BOUNDED_FIFO_H_
 
+#include "base/bit_utils.h"
+#include "base/logging.h"
+
 namespace art {
 
 // A bounded fifo is a fifo which has a bounded size. The power of two version uses a bit mask to
 // avoid needing to deal with wrapping integers around or using a modulo operation.
-template <typename T, const size_t MaxSize>
+template <typename T, const size_t kMaxSize>
 class BoundedFifoPowerOfTwo {
+  static_assert(IsPowerOfTwo(kMaxSize), "kMaxSize must be a power of 2.");
+
  public:
   BoundedFifoPowerOfTwo() {
-    // TODO: Do this with a compile time check.
-    CHECK(IsPowerOfTwo(MaxSize));
     clear();
   }
 
@@ -45,7 +48,7 @@
 
   void push_back(const T& value) {
     ++size_;
-    DCHECK_LE(size_, MaxSize);
+    DCHECK_LE(size_, kMaxSize);
     // Relies on integer overflow behavior.
     data_[back_index_++ & mask_] = value;
   }
@@ -61,9 +64,9 @@
   }
 
  private:
-  static const size_t mask_ = MaxSize - 1;
+  static const size_t mask_ = kMaxSize - 1;
   size_t back_index_, size_;
-  T data_[MaxSize];
+  T data_[kMaxSize];
 };
 
 }  // namespace art
diff --git a/runtime/base/histogram-inl.h b/runtime/base/histogram-inl.h
index 0f969b9..aba3762 100644
--- a/runtime/base/histogram-inl.h
+++ b/runtime/base/histogram-inl.h
@@ -17,15 +17,16 @@
 #ifndef ART_RUNTIME_BASE_HISTOGRAM_INL_H_
 #define ART_RUNTIME_BASE_HISTOGRAM_INL_H_
 
-#include "histogram.h"
-
-#include "utils.h"
-
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <ostream>
 
+#include "histogram.h"
+
+#include "base/bit_utils.h"
+#include "base/time_utils.h"
+
 namespace art {
 
 template <class Value> inline void Histogram<Value>::AddValue(Value value) {
diff --git a/runtime/base/histogram.h b/runtime/base/histogram.h
index c312fb2..ef3a5d7 100644
--- a/runtime/base/histogram.h
+++ b/runtime/base/histogram.h
@@ -20,7 +20,6 @@
 #include <string>
 
 #include "base/logging.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/runtime/base/iteration_range.h b/runtime/base/iteration_range.h
new file mode 100644
index 0000000..5a46376
--- /dev/null
+++ b/runtime/base/iteration_range.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#ifndef ART_RUNTIME_BASE_ITERATION_RANGE_H_
+#define ART_RUNTIME_BASE_ITERATION_RANGE_H_
+
+namespace art {
+
+// Helper class that acts as a container for range-based loops, given an iteration
+// range [first, last) defined by two iterators.
+template <typename Iter>
+class IterationRange {
+ public:
+  typedef Iter iterator;
+  typedef typename std::iterator_traits<Iter>::difference_type difference_type;
+  typedef typename std::iterator_traits<Iter>::value_type value_type;
+  typedef typename std::iterator_traits<Iter>::pointer pointer;
+  typedef typename std::iterator_traits<Iter>::reference reference;
+
+  IterationRange(iterator first, iterator last) : first_(first), last_(last) { }
+
+  iterator begin() const { return first_; }
+  iterator end() const { return last_; }
+  iterator cbegin() const { return first_; }
+  iterator cend() const { return last_; }
+
+ private:
+  iterator first_;
+  iterator last_;
+};
+
+}  // namespace art
+
+#endif  // ART_RUNTIME_BASE_ITERATION_RANGE_H_
diff --git a/runtime/base/mutex-inl.h b/runtime/base/mutex-inl.h
index a727992..87840e7 100644
--- a/runtime/base/mutex-inl.h
+++ b/runtime/base/mutex-inl.h
@@ -25,6 +25,7 @@
 #include "base/value_object.h"
 #include "runtime.h"
 #include "thread.h"
+#include "utils.h"
 
 #if ART_USE_FUTEXES
 #include "linux/futex.h"
diff --git a/runtime/base/mutex.cc b/runtime/base/mutex.cc
index 99c7246..5c6065d 100644
--- a/runtime/base/mutex.cc
+++ b/runtime/base/mutex.cc
@@ -24,12 +24,12 @@
 
 #include "atomic.h"
 #include "base/logging.h"
+#include "base/time_utils.h"
 #include "base/value_object.h"
 #include "mutex-inl.h"
 #include "runtime.h"
 #include "scoped_thread_state_change.h"
 #include "thread-inl.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/runtime/base/time_utils.cc b/runtime/base/time_utils.cc
new file mode 100644
index 0000000..29b849e
--- /dev/null
+++ b/runtime/base/time_utils.cc
@@ -0,0 +1,205 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#include <inttypes.h>
+#include <sstream>
+
+#include "time_utils.h"
+
+#include "base/logging.h"
+#include "base/stringprintf.h"
+
+namespace art {
+
+std::string PrettyDuration(uint64_t nano_duration, size_t max_fraction_digits) {
+  if (nano_duration == 0) {
+    return "0";
+  } else {
+    return FormatDuration(nano_duration, GetAppropriateTimeUnit(nano_duration),
+                          max_fraction_digits);
+  }
+}
+
+TimeUnit GetAppropriateTimeUnit(uint64_t nano_duration) {
+  const uint64_t one_sec = 1000 * 1000 * 1000;
+  const uint64_t one_ms  = 1000 * 1000;
+  const uint64_t one_us  = 1000;
+  if (nano_duration >= one_sec) {
+    return kTimeUnitSecond;
+  } else if (nano_duration >= one_ms) {
+    return kTimeUnitMillisecond;
+  } else if (nano_duration >= one_us) {
+    return kTimeUnitMicrosecond;
+  } else {
+    return kTimeUnitNanosecond;
+  }
+}
+
+uint64_t GetNsToTimeUnitDivisor(TimeUnit time_unit) {
+  const uint64_t one_sec = 1000 * 1000 * 1000;
+  const uint64_t one_ms  = 1000 * 1000;
+  const uint64_t one_us  = 1000;
+
+  switch (time_unit) {
+    case kTimeUnitSecond:
+      return one_sec;
+    case kTimeUnitMillisecond:
+      return one_ms;
+    case kTimeUnitMicrosecond:
+      return one_us;
+    case kTimeUnitNanosecond:
+      return 1;
+  }
+  return 0;
+}
+
+std::string FormatDuration(uint64_t nano_duration, TimeUnit time_unit,
+                           size_t max_fraction_digits) {
+  const char* unit = nullptr;
+  uint64_t divisor = GetNsToTimeUnitDivisor(time_unit);
+  switch (time_unit) {
+    case kTimeUnitSecond:
+      unit = "s";
+      break;
+    case kTimeUnitMillisecond:
+      unit = "ms";
+      break;
+    case kTimeUnitMicrosecond:
+      unit = "us";
+      break;
+    case kTimeUnitNanosecond:
+      unit = "ns";
+      break;
+  }
+  const uint64_t whole_part = nano_duration / divisor;
+  uint64_t fractional_part = nano_duration % divisor;
+  if (fractional_part == 0) {
+    return StringPrintf("%" PRIu64 "%s", whole_part, unit);
+  } else {
+    static constexpr size_t kMaxDigits = 30;
+    size_t avail_digits = kMaxDigits;
+    char fraction_buffer[kMaxDigits];
+    char* ptr = fraction_buffer;
+    uint64_t multiplier = 10;
+    // This infinite loops if fractional part is 0.
+    while (avail_digits > 1 && fractional_part * multiplier < divisor) {
+      multiplier *= 10;
+      *ptr++ = '0';
+      avail_digits--;
+    }
+    snprintf(ptr, avail_digits, "%" PRIu64, fractional_part);
+    fraction_buffer[std::min(kMaxDigits - 1, max_fraction_digits)] = '\0';
+    return StringPrintf("%" PRIu64 ".%s%s", whole_part, fraction_buffer, unit);
+  }
+}
+
+std::string GetIsoDate() {
+  time_t now = time(nullptr);
+  tm tmbuf;
+  tm* ptm = localtime_r(&now, &tmbuf);
+  return StringPrintf("%04d-%02d-%02d %02d:%02d:%02d",
+      ptm->tm_year + 1900, ptm->tm_mon+1, ptm->tm_mday,
+      ptm->tm_hour, ptm->tm_min, ptm->tm_sec);
+}
+
+uint64_t MilliTime() {
+#if defined(__linux__)
+  timespec now;
+  clock_gettime(CLOCK_MONOTONIC, &now);
+  return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000) + now.tv_nsec / UINT64_C(1000000);
+#else  // __APPLE__
+  timeval now;
+  gettimeofday(&now, nullptr);
+  return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000) + now.tv_usec / UINT64_C(1000);
+#endif
+}
+
+uint64_t MicroTime() {
+#if defined(__linux__)
+  timespec now;
+  clock_gettime(CLOCK_MONOTONIC, &now);
+  return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000);
+#else  // __APPLE__
+  timeval now;
+  gettimeofday(&now, nullptr);
+  return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_usec;
+#endif
+}
+
+uint64_t NanoTime() {
+#if defined(__linux__)
+  timespec now;
+  clock_gettime(CLOCK_MONOTONIC, &now);
+  return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec;
+#else  // __APPLE__
+  timeval now;
+  gettimeofday(&now, nullptr);
+  return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_usec * UINT64_C(1000);
+#endif
+}
+
+uint64_t ThreadCpuNanoTime() {
+#if defined(__linux__)
+  timespec now;
+  clock_gettime(CLOCK_THREAD_CPUTIME_ID, &now);
+  return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec;
+#else  // __APPLE__
+  UNIMPLEMENTED(WARNING);
+  return -1;
+#endif
+}
+
+void NanoSleep(uint64_t ns) {
+  timespec tm;
+  tm.tv_sec = ns / MsToNs(1000);
+  tm.tv_nsec = ns - static_cast<uint64_t>(tm.tv_sec) * MsToNs(1000);
+  nanosleep(&tm, nullptr);
+}
+
+void InitTimeSpec(bool absolute, int clock, int64_t ms, int32_t ns, timespec* ts) {
+  int64_t endSec;
+
+  if (absolute) {
+#if !defined(__APPLE__)
+    clock_gettime(clock, ts);
+#else
+    UNUSED(clock);
+    timeval tv;
+    gettimeofday(&tv, nullptr);
+    ts->tv_sec = tv.tv_sec;
+    ts->tv_nsec = tv.tv_usec * 1000;
+#endif
+  } else {
+    ts->tv_sec = 0;
+    ts->tv_nsec = 0;
+  }
+  endSec = ts->tv_sec + ms / 1000;
+  if (UNLIKELY(endSec >= 0x7fffffff)) {
+    std::ostringstream ss;
+    LOG(INFO) << "Note: end time exceeds epoch: " << ss.str();
+    endSec = 0x7ffffffe;
+  }
+  ts->tv_sec = endSec;
+  ts->tv_nsec = (ts->tv_nsec + (ms % 1000) * 1000000) + ns;
+
+  // Catch rollover.
+  if (ts->tv_nsec >= 1000000000L) {
+    ts->tv_sec++;
+    ts->tv_nsec -= 1000000000L;
+  }
+}
+
+}  // namespace art
diff --git a/runtime/base/time_utils.h b/runtime/base/time_utils.h
new file mode 100644
index 0000000..f58c22a
--- /dev/null
+++ b/runtime/base/time_utils.h
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#ifndef ART_RUNTIME_BASE_TIME_UTILS_H_
+#define ART_RUNTIME_BASE_TIME_UTILS_H_
+
+#include <stdint.h>
+#include <string>
+#include <time.h>
+
+#include "base/macros.h"
+
+namespace art {
+
+enum TimeUnit {
+  kTimeUnitNanosecond,
+  kTimeUnitMicrosecond,
+  kTimeUnitMillisecond,
+  kTimeUnitSecond,
+};
+
+// Returns a human-readable time string which prints every nanosecond while trying to limit the
+// number of trailing zeros. Prints using the largest human readable unit up to a second.
+// e.g. "1ms", "1.000000001s", "1.001us"
+std::string PrettyDuration(uint64_t nano_duration, size_t max_fraction_digits = 3);
+
+// Format a nanosecond time to specified units.
+std::string FormatDuration(uint64_t nano_duration, TimeUnit time_unit,
+                           size_t max_fraction_digits);
+
+// Get the appropriate unit for a nanosecond duration.
+TimeUnit GetAppropriateTimeUnit(uint64_t nano_duration);
+
+// Get the divisor to convert from a nanoseconds to a time unit.
+uint64_t GetNsToTimeUnitDivisor(TimeUnit time_unit);
+
+// Returns the current date in ISO yyyy-mm-dd hh:mm:ss format.
+std::string GetIsoDate();
+
+// Returns the monotonic time since some unspecified starting point in milliseconds.
+uint64_t MilliTime();
+
+// Returns the monotonic time since some unspecified starting point in microseconds.
+uint64_t MicroTime();
+
+// Returns the monotonic time since some unspecified starting point in nanoseconds.
+uint64_t NanoTime();
+
+// Returns the thread-specific CPU-time clock in nanoseconds or -1 if unavailable.
+uint64_t ThreadCpuNanoTime();
+
+// Converts the given number of nanoseconds to milliseconds.
+static constexpr inline uint64_t NsToMs(uint64_t ns) {
+  return ns / 1000 / 1000;
+}
+
+// Converts the given number of milliseconds to nanoseconds
+static constexpr inline uint64_t MsToNs(uint64_t ns) {
+  return ns * 1000 * 1000;
+}
+
+#if defined(__APPLE__)
+// No clocks to specify on OS/X, fake value to pass to routines that require a clock.
+#define CLOCK_REALTIME 0xebadf00d
+#endif
+
+// Sleep for the given number of nanoseconds, a bad way to handle contention.
+void NanoSleep(uint64_t ns);
+
+// Initialize a timespec to either a relative time (ms,ns), or to the absolute
+// time corresponding to the indicated clock value plus the supplied offset.
+void InitTimeSpec(bool absolute, int clock, int64_t ms, int32_t ns, timespec* ts);
+
+}  // namespace art
+
+#endif  // ART_RUNTIME_BASE_TIME_UTILS_H_
diff --git a/runtime/base/time_utils_test.cc b/runtime/base/time_utils_test.cc
new file mode 100644
index 0000000..c553f4e
--- /dev/null
+++ b/runtime/base/time_utils_test.cc
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#include "time_utils.h"
+
+#include "gtest/gtest.h"
+
+namespace art {
+
+TEST(TimeUtilsTest, PrettyDuration) {
+  const uint64_t one_sec = 1000000000;
+  const uint64_t one_ms  = 1000000;
+  const uint64_t one_us  = 1000;
+
+  EXPECT_EQ("1s", PrettyDuration(1 * one_sec));
+  EXPECT_EQ("10s", PrettyDuration(10 * one_sec));
+  EXPECT_EQ("100s", PrettyDuration(100 * one_sec));
+  EXPECT_EQ("1.001s", PrettyDuration(1 * one_sec + one_ms));
+  EXPECT_EQ("1.000001s", PrettyDuration(1 * one_sec + one_us, 6));
+  EXPECT_EQ("1.000000001s", PrettyDuration(1 * one_sec + 1, 9));
+  EXPECT_EQ("1.000s", PrettyDuration(1 * one_sec + one_us, 3));
+
+  EXPECT_EQ("1ms", PrettyDuration(1 * one_ms));
+  EXPECT_EQ("10ms", PrettyDuration(10 * one_ms));
+  EXPECT_EQ("100ms", PrettyDuration(100 * one_ms));
+  EXPECT_EQ("1.001ms", PrettyDuration(1 * one_ms + one_us));
+  EXPECT_EQ("1.000001ms", PrettyDuration(1 * one_ms + 1, 6));
+
+  EXPECT_EQ("1us", PrettyDuration(1 * one_us));
+  EXPECT_EQ("10us", PrettyDuration(10 * one_us));
+  EXPECT_EQ("100us", PrettyDuration(100 * one_us));
+  EXPECT_EQ("1.001us", PrettyDuration(1 * one_us + 1));
+
+  EXPECT_EQ("1ns", PrettyDuration(1));
+  EXPECT_EQ("10ns", PrettyDuration(10));
+  EXPECT_EQ("100ns", PrettyDuration(100));
+}
+
+TEST(TimeUtilsTest, TestSleep) {
+  auto start = NanoTime();
+  NanoSleep(MsToNs(1500));
+  EXPECT_GT(NanoTime() - start, MsToNs(1000));
+}
+
+}  // namespace art
diff --git a/runtime/base/timing_logger.cc b/runtime/base/timing_logger.cc
index b6a2aaf..f1f6f9b 100644
--- a/runtime/base/timing_logger.cc
+++ b/runtime/base/timing_logger.cc
@@ -22,9 +22,10 @@
 #include "timing_logger.h"
 
 #include "base/logging.h"
-#include "thread-inl.h"
 #include "base/stl_util.h"
 #include "base/histogram-inl.h"
+#include "base/time_utils.h"
+#include "thread-inl.h"
 
 #include <cmath>
 #include <iomanip>
diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index 292f830..ab5f176 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -30,6 +30,7 @@
 #include "base/logging.h"
 #include "base/scoped_flock.h"
 #include "base/stl_util.h"
+#include "base/time_utils.h"
 #include "base/unix_file/fd_file.h"
 #include "base/value_object.h"
 #include "class_linker-inl.h"
diff --git a/runtime/debugger.cc b/runtime/debugger.cc
index 0eb7f2b..c3c0395 100644
--- a/runtime/debugger.cc
+++ b/runtime/debugger.cc
@@ -22,6 +22,7 @@
 
 #include "arch/context.h"
 #include "art_field-inl.h"
+#include "base/time_utils.h"
 #include "class_linker.h"
 #include "class_linker-inl.h"
 #include "dex_file-inl.h"
diff --git a/runtime/dex_file-inl.h b/runtime/dex_file-inl.h
index 760006a..4e6c3ca 100644
--- a/runtime/dex_file-inl.h
+++ b/runtime/dex_file-inl.h
@@ -17,11 +17,11 @@
 #ifndef ART_RUNTIME_DEX_FILE_INL_H_
 #define ART_RUNTIME_DEX_FILE_INL_H_
 
+#include "base/bit_utils.h"
 #include "base/logging.h"
 #include "base/stringpiece.h"
 #include "dex_file.h"
 #include "leb128.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/runtime/gc/accounting/atomic_stack.h b/runtime/gc/accounting/atomic_stack.h
index 399832a..ac716ea 100644
--- a/runtime/gc/accounting/atomic_stack.h
+++ b/runtime/gc/accounting/atomic_stack.h
@@ -22,11 +22,11 @@
 #include <string>
 
 #include "atomic.h"
+#include "base/bit_utils.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "mem_map.h"
 #include "stack.h"
-#include "utils.h"
 
 namespace art {
 namespace gc {
diff --git a/runtime/gc/accounting/bitmap-inl.h b/runtime/gc/accounting/bitmap-inl.h
index e87a0c0..cd3923a 100644
--- a/runtime/gc/accounting/bitmap-inl.h
+++ b/runtime/gc/accounting/bitmap-inl.h
@@ -22,8 +22,8 @@
 #include <memory>
 
 #include "atomic.h"
+#include "base/bit_utils.h"
 #include "base/logging.h"
-#include "utils.h"
 
 namespace art {
 namespace gc {
diff --git a/runtime/gc/accounting/bitmap.cc b/runtime/gc/accounting/bitmap.cc
index 13fcdb3..fdded02 100644
--- a/runtime/gc/accounting/bitmap.cc
+++ b/runtime/gc/accounting/bitmap.cc
@@ -16,6 +16,7 @@
 
 #include "bitmap-inl.h"
 
+#include "base/bit_utils.h"
 #include "card_table.h"
 #include "mem_map.h"
 
diff --git a/runtime/gc/accounting/card_table-inl.h b/runtime/gc/accounting/card_table-inl.h
index b936d93..f72f219 100644
--- a/runtime/gc/accounting/card_table-inl.h
+++ b/runtime/gc/accounting/card_table-inl.h
@@ -18,11 +18,11 @@
 #define ART_RUNTIME_GC_ACCOUNTING_CARD_TABLE_INL_H_
 
 #include "atomic.h"
+#include "base/bit_utils.h"
 #include "base/logging.h"
 #include "card_table.h"
 #include "mem_map.h"
 #include "space_bitmap.h"
-#include "utils.h"
 
 namespace art {
 namespace gc {
diff --git a/runtime/gc/accounting/read_barrier_table.h b/runtime/gc/accounting/read_barrier_table.h
index bb9aae7..436df92 100644
--- a/runtime/gc/accounting/read_barrier_table.h
+++ b/runtime/gc/accounting/read_barrier_table.h
@@ -17,6 +17,7 @@
 #ifndef ART_RUNTIME_GC_ACCOUNTING_READ_BARRIER_TABLE_H_
 #define ART_RUNTIME_GC_ACCOUNTING_READ_BARRIER_TABLE_H_
 
+#include "base/bit_utils.h"
 #include "base/mutex.h"
 #include "gc/space/space.h"
 #include "globals.h"
diff --git a/runtime/gc/accounting/space_bitmap-inl.h b/runtime/gc/accounting/space_bitmap-inl.h
index ae91200..c16f5d3 100644
--- a/runtime/gc/accounting/space_bitmap-inl.h
+++ b/runtime/gc/accounting/space_bitmap-inl.h
@@ -22,8 +22,8 @@
 #include <memory>
 
 #include "atomic.h"
+#include "base/bit_utils.h"
 #include "base/logging.h"
-#include "utils.h"
 
 namespace art {
 namespace gc {
diff --git a/runtime/gc/allocator/dlmalloc.cc b/runtime/gc/allocator/dlmalloc.cc
index 8558f96..3d85395 100644
--- a/runtime/gc/allocator/dlmalloc.cc
+++ b/runtime/gc/allocator/dlmalloc.cc
@@ -16,6 +16,7 @@
 
 #include "dlmalloc.h"
 
+#include "base/bit_utils.h"
 #include "base/logging.h"
 
 // ART specific morecore implementation defined in space.cc.
diff --git a/runtime/gc/allocator/rosalloc.h b/runtime/gc/allocator/rosalloc.h
index a54edcc..0fcfe72 100644
--- a/runtime/gc/allocator/rosalloc.h
+++ b/runtime/gc/allocator/rosalloc.h
@@ -27,11 +27,11 @@
 #include <vector>
 
 #include "base/allocator.h"
+#include "base/bit_utils.h"
 #include "base/mutex.h"
 #include "base/logging.h"
 #include "globals.h"
 #include "thread.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/runtime/gc/collector/garbage_collector.cc b/runtime/gc/collector/garbage_collector.cc
index 47d6ada..afd0a30 100644
--- a/runtime/gc/collector/garbage_collector.cc
+++ b/runtime/gc/collector/garbage_collector.cc
@@ -25,11 +25,13 @@
 #include "base/histogram-inl.h"
 #include "base/logging.h"
 #include "base/mutex-inl.h"
+#include "base/time_utils.h"
 #include "gc/accounting/heap_bitmap.h"
 #include "gc/space/large_object_space.h"
 #include "gc/space/space-inl.h"
 #include "thread-inl.h"
 #include "thread_list.h"
+#include "utils.h"
 
 namespace art {
 namespace gc {
diff --git a/runtime/gc/collector/mark_sweep.cc b/runtime/gc/collector/mark_sweep.cc
index 5401b56..2f0ef26 100644
--- a/runtime/gc/collector/mark_sweep.cc
+++ b/runtime/gc/collector/mark_sweep.cc
@@ -29,6 +29,7 @@
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/mutex-inl.h"
+#include "base/time_utils.h"
 #include "base/timing_logger.h"
 #include "gc/accounting/card_table-inl.h"
 #include "gc/accounting/heap_bitmap-inl.h"
diff --git a/runtime/gc/heap-inl.h b/runtime/gc/heap-inl.h
index fbf36e8..eb0e9be 100644
--- a/runtime/gc/heap-inl.h
+++ b/runtime/gc/heap-inl.h
@@ -19,6 +19,7 @@
 
 #include "heap.h"
 
+#include "base/time_utils.h"
 #include "debugger.h"
 #include "gc/accounting/card_table-inl.h"
 #include "gc/collector/semi_space.h"
@@ -31,6 +32,7 @@
 #include "handle_scope-inl.h"
 #include "thread.h"
 #include "thread-inl.h"
+#include "utils.h"
 #include "verify_object-inl.h"
 
 namespace art {
diff --git a/runtime/gc/heap.cc b/runtime/gc/heap.cc
index 11a0e3c..fbde494 100644
--- a/runtime/gc/heap.cc
+++ b/runtime/gc/heap.cc
@@ -28,6 +28,7 @@
 #include "base/dumpable.h"
 #include "base/histogram-inl.h"
 #include "base/stl_util.h"
+#include "base/time_utils.h"
 #include "common_throws.h"
 #include "cutils/sched_policy.h"
 #include "debugger.h"
diff --git a/runtime/gc/heap.h b/runtime/gc/heap.h
index 90249f9..c72414a 100644
--- a/runtime/gc/heap.h
+++ b/runtime/gc/heap.h
@@ -24,6 +24,7 @@
 #include "allocator_type.h"
 #include "arch/instruction_set.h"
 #include "atomic.h"
+#include "base/time_utils.h"
 #include "base/timing_logger.h"
 #include "gc/accounting/atomic_stack.h"
 #include "gc/accounting/card_table.h"
diff --git a/runtime/gc/reference_processor.cc b/runtime/gc/reference_processor.cc
index 01e8795..5af2a53 100644
--- a/runtime/gc/reference_processor.cc
+++ b/runtime/gc/reference_processor.cc
@@ -16,6 +16,7 @@
 
 #include "reference_processor.h"
 
+#include "base/time_utils.h"
 #include "mirror/object-inl.h"
 #include "mirror/reference.h"
 #include "mirror/reference-inl.h"
@@ -24,6 +25,7 @@
 #include "ScopedLocalRef.h"
 #include "scoped_thread_state_change.h"
 #include "task_processor.h"
+#include "utils.h"
 #include "well_known_classes.h"
 
 namespace art {
diff --git a/runtime/gc/space/bump_pointer_space-inl.h b/runtime/gc/space/bump_pointer_space-inl.h
index 14a93d1..d9ad9a3 100644
--- a/runtime/gc/space/bump_pointer_space-inl.h
+++ b/runtime/gc/space/bump_pointer_space-inl.h
@@ -17,6 +17,7 @@
 #ifndef ART_RUNTIME_GC_SPACE_BUMP_POINTER_SPACE_INL_H_
 #define ART_RUNTIME_GC_SPACE_BUMP_POINTER_SPACE_INL_H_
 
+#include "base/bit_utils.h"
 #include "bump_pointer_space.h"
 
 namespace art {
diff --git a/runtime/gc/space/dlmalloc_space.cc b/runtime/gc/space/dlmalloc_space.cc
index 7b1a421f..5237c7b 100644
--- a/runtime/gc/space/dlmalloc_space.cc
+++ b/runtime/gc/space/dlmalloc_space.cc
@@ -16,6 +16,7 @@
 
 #include "dlmalloc_space-inl.h"
 
+#include "base/time_utils.h"
 #include "gc/accounting/card_table.h"
 #include "gc/accounting/space_bitmap-inl.h"
 #include "gc/heap.h"
diff --git a/runtime/gc/space/image_space.cc b/runtime/gc/space/image_space.cc
index 99f5d45..ade9cec0 100644
--- a/runtime/gc/space/image_space.cc
+++ b/runtime/gc/space/image_space.cc
@@ -25,8 +25,9 @@
 
 #include "base/macros.h"
 #include "base/stl_util.h"
-#include "base/unix_file/fd_file.h"
 #include "base/scoped_flock.h"
+#include "base/time_utils.h"
+#include "base/unix_file/fd_file.h"
 #include "gc/accounting/space_bitmap-inl.h"
 #include "mirror/art_method.h"
 #include "mirror/class-inl.h"
diff --git a/runtime/gc/space/large_object_space.cc b/runtime/gc/space/large_object_space.cc
index 4dfdaa5..da4a930 100644
--- a/runtime/gc/space/large_object_space.cc
+++ b/runtime/gc/space/large_object_space.cc
@@ -27,7 +27,6 @@
 #include "os.h"
 #include "space-inl.h"
 #include "thread-inl.h"
-#include "utils.h"
 
 namespace art {
 namespace gc {
diff --git a/runtime/gc/space/large_object_space_test.cc b/runtime/gc/space/large_object_space_test.cc
index a261663..f04a7ca 100644
--- a/runtime/gc/space/large_object_space_test.cc
+++ b/runtime/gc/space/large_object_space_test.cc
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include "base/time_utils.h"
 #include "space_test.h"
 #include "large_object_space.h"
 
diff --git a/runtime/gc/space/rosalloc_space.cc b/runtime/gc/space/rosalloc_space.cc
index 2c7d93e..bc4414d 100644
--- a/runtime/gc/space/rosalloc_space.cc
+++ b/runtime/gc/space/rosalloc_space.cc
@@ -20,6 +20,7 @@
 #define ATRACE_TAG ATRACE_TAG_DALVIK
 #include "cutils/trace.h"
 
+#include "base/time_utils.h"
 #include "gc/accounting/card_table.h"
 #include "gc/accounting/space_bitmap-inl.h"
 #include "gc/heap.h"
diff --git a/runtime/gc/task_processor.cc b/runtime/gc/task_processor.cc
index ef34c68..a49121b 100644
--- a/runtime/gc/task_processor.cc
+++ b/runtime/gc/task_processor.cc
@@ -16,6 +16,7 @@
 
 #include "task_processor.h"
 
+#include "base/time_utils.h"
 #include "scoped_thread_state_change.h"
 
 namespace art {
diff --git a/runtime/gc/task_processor_test.cc b/runtime/gc/task_processor_test.cc
index 5dd6d8f..f06f68d 100644
--- a/runtime/gc/task_processor_test.cc
+++ b/runtime/gc/task_processor_test.cc
@@ -14,11 +14,11 @@
  * limitations under the License.
  */
 
+#include "base/time_utils.h"
 #include "common_runtime_test.h"
 #include "task_processor.h"
 #include "thread_pool.h"
 #include "thread-inl.h"
-#include "utils.h"
 
 namespace art {
 namespace gc {
diff --git a/runtime/handle_scope.h b/runtime/handle_scope.h
index 271312e..ac28c8a 100644
--- a/runtime/handle_scope.h
+++ b/runtime/handle_scope.h
@@ -23,7 +23,6 @@
 #include "base/macros.h"
 #include "handle.h"
 #include "stack.h"
-#include "utils.h"
 #include "verify_object.h"
 
 namespace art {
diff --git a/runtime/hprof/hprof.cc b/runtime/hprof/hprof.cc
index efead51..88a72ec 100644
--- a/runtime/hprof/hprof.cc
+++ b/runtime/hprof/hprof.cc
@@ -40,6 +40,7 @@
 #include "art_field-inl.h"
 #include "base/logging.h"
 #include "base/stringprintf.h"
+#include "base/time_utils.h"
 #include "base/unix_file/fd_file.h"
 #include "class_linker.h"
 #include "common_throws.h"
diff --git a/runtime/image.cc b/runtime/image.cc
index 2d8c1c4..d9bd2a8 100644
--- a/runtime/image.cc
+++ b/runtime/image.cc
@@ -16,10 +16,10 @@
 
 #include "image.h"
 
+#include "base/bit_utils.h"
 #include "mirror/object_array.h"
 #include "mirror/object_array-inl.h"
 #include "mirror/object-inl.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/runtime/image.h b/runtime/image.h
index 613414a..52995ed 100644
--- a/runtime/image.h
+++ b/runtime/image.h
@@ -21,7 +21,6 @@
 
 #include "globals.h"
 #include "mirror/object.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/runtime/jdwp/jdwp_handler.cc b/runtime/jdwp/jdwp_handler.cc
index 8e9ab32..f7f70f6 100644
--- a/runtime/jdwp/jdwp_handler.cc
+++ b/runtime/jdwp/jdwp_handler.cc
@@ -32,6 +32,7 @@
 #include "jdwp/jdwp_priv.h"
 #include "runtime.h"
 #include "thread-inl.h"
+#include "utils.h"
 
 namespace art {
 
diff --git a/runtime/jdwp/jdwp_main.cc b/runtime/jdwp/jdwp_main.cc
index 5b30f0c..e6b97a2 100644
--- a/runtime/jdwp/jdwp_main.cc
+++ b/runtime/jdwp/jdwp_main.cc
@@ -22,6 +22,7 @@
 
 #include "atomic.h"
 #include "base/logging.h"
+#include "base/time_utils.h"
 #include "debugger.h"
 #include "jdwp/jdwp_priv.h"
 #include "scoped_thread_state_change.h"
diff --git a/runtime/jit/jit.h b/runtime/jit/jit.h
index c698cfc..8f92453 100644
--- a/runtime/jit/jit.h
+++ b/runtime/jit/jit.h
@@ -33,6 +33,10 @@
 class CompilerCallbacks;
 struct RuntimeArgumentMap;
 
+namespace mirror {
+class ArtMethod;
+}  // namespace mirror
+
 namespace jit {
 
 class JitCodeCache;
diff --git a/runtime/jit/jit_code_cache_test.cc b/runtime/jit/jit_code_cache_test.cc
index 2155552..afa5a3e 100644
--- a/runtime/jit/jit_code_cache_test.cc
+++ b/runtime/jit/jit_code_cache_test.cc
@@ -21,7 +21,6 @@
 #include "mirror/art_method-inl.h"
 #include "scoped_thread_state_change.h"
 #include "thread-inl.h"
-#include "utils.h"
 
 namespace art {
 namespace jit {
diff --git a/runtime/leb128.h b/runtime/leb128.h
index 2e27b8e..14683d4 100644
--- a/runtime/leb128.h
+++ b/runtime/leb128.h
@@ -17,8 +17,11 @@
 #ifndef ART_RUNTIME_LEB128_H_
 #define ART_RUNTIME_LEB128_H_
 
+#include <vector>
+
+#include "base/bit_utils.h"
+#include "base/logging.h"
 #include "globals.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/runtime/leb128_test.cc b/runtime/leb128_test.cc
index 87e13ff..1bb493d 100644
--- a/runtime/leb128_test.cc
+++ b/runtime/leb128_test.cc
@@ -18,6 +18,7 @@
 
 #include "gtest/gtest.h"
 #include "base/histogram-inl.h"
+#include "base/time_utils.h"
 
 namespace art {
 
diff --git a/runtime/lock_word.h b/runtime/lock_word.h
index 655aa3a..aafbfe4 100644
--- a/runtime/lock_word.h
+++ b/runtime/lock_word.h
@@ -20,9 +20,9 @@
 #include <iosfwd>
 #include <stdint.h>
 
+#include "base/bit_utils.h"
 #include "base/logging.h"
 #include "read_barrier.h"
-#include "utils.h"
 
 namespace art {
 namespace mirror {
diff --git a/runtime/memory_region.h b/runtime/memory_region.h
index 6a784eb..13c69ac 100644
--- a/runtime/memory_region.h
+++ b/runtime/memory_region.h
@@ -18,13 +18,15 @@
 #define ART_RUNTIME_MEMORY_REGION_H_
 
 #include <stdint.h>
+#include <type_traits>
 
+#include "arch/instruction_set.h"
+#include "base/bit_utils.h"
 #include "base/casts.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/value_object.h"
 #include "globals.h"
-#include "utils.h"
 
 namespace art {
 
@@ -71,7 +73,7 @@
   template<typename T>
   ALWAYS_INLINE T LoadUnaligned(uintptr_t offset) const {
     // Equivalent unsigned integer type corresponding to T.
-    typedef typename UnsignedIntegerType<sizeof(T)>::type U;
+    typedef typename std::make_unsigned<T>::type U;
     U equivalent_unsigned_integer_value = 0;
     // Read the value byte by byte in a little-endian fashion.
     for (size_t i = 0; i < sizeof(U); ++i) {
@@ -86,7 +88,7 @@
   template<typename T>
   ALWAYS_INLINE void StoreUnaligned(uintptr_t offset, T value) const {
     // Equivalent unsigned integer type corresponding to T.
-    typedef typename UnsignedIntegerType<sizeof(T)>::type U;
+    typedef typename std::make_unsigned<T>::type U;
     U equivalent_unsigned_integer_value = bit_cast<U, T>(value);
     // Write the value byte by byte in a little-endian fashion.
     for (size_t i = 0; i < sizeof(U); ++i) {
diff --git a/runtime/mirror/array-inl.h b/runtime/mirror/array-inl.h
index 8b3418d..e93717e 100644
--- a/runtime/mirror/array-inl.h
+++ b/runtime/mirror/array-inl.h
@@ -19,11 +19,13 @@
 
 #include "array.h"
 
+#include "base/bit_utils.h"
+#include "base/logging.h"
 #include "base/stringprintf.h"
+#include "base/casts.h"
 #include "class.h"
 #include "gc/heap-inl.h"
 #include "thread.h"
-#include "utils.h"
 
 namespace art {
 namespace mirror {
diff --git a/runtime/mirror/art_method-inl.h b/runtime/mirror/art_method-inl.h
index 0f306e8..7c8067a 100644
--- a/runtime/mirror/art_method-inl.h
+++ b/runtime/mirror/art_method-inl.h
@@ -31,6 +31,7 @@
 #include "quick/quick_method_frame_info.h"
 #include "read_barrier-inl.h"
 #include "runtime-inl.h"
+#include "utils.h"
 
 namespace art {
 namespace mirror {
diff --git a/runtime/mirror/class-inl.h b/runtime/mirror/class-inl.h
index cc6f5c4..5752a15 100644
--- a/runtime/mirror/class-inl.h
+++ b/runtime/mirror/class-inl.h
@@ -32,6 +32,7 @@
 #include "reference-inl.h"
 #include "runtime.h"
 #include "string.h"
+#include "utils.h"
 
 namespace art {
 namespace mirror {
diff --git a/runtime/mirror/class.h b/runtime/mirror/class.h
index d3cfd01..b99fc68 100644
--- a/runtime/mirror/class.h
+++ b/runtime/mirror/class.h
@@ -27,7 +27,6 @@
 #include "object_callbacks.h"
 #include "primitive.h"
 #include "read_barrier_option.h"
-#include "utils.h"
 
 #ifndef IMT_SIZE
 #error IMT_SIZE not defined
diff --git a/runtime/mirror/object_array-inl.h b/runtime/mirror/object_array-inl.h
index d473816..bef4af6 100644
--- a/runtime/mirror/object_array-inl.h
+++ b/runtime/mirror/object_array-inl.h
@@ -17,6 +17,8 @@
 #ifndef ART_RUNTIME_MIRROR_OBJECT_ARRAY_INL_H_
 #define ART_RUNTIME_MIRROR_OBJECT_ARRAY_INL_H_
 
+#include <string>
+
 #include "object_array.h"
 
 #include "array-inl.h"
@@ -26,7 +28,7 @@
 #include "runtime.h"
 #include "handle_scope-inl.h"
 #include "thread.h"
-#include <string>
+#include "utils.h"
 
 namespace art {
 namespace mirror {
diff --git a/runtime/mirror/string-inl.h b/runtime/mirror/string-inl.h
index cd5d2f6..35b8aef 100644
--- a/runtime/mirror/string-inl.h
+++ b/runtime/mirror/string-inl.h
@@ -25,6 +25,7 @@
 #include "string.h"
 #include "thread.h"
 #include "utf.h"
+#include "utils.h"
 
 namespace art {
 namespace mirror {
diff --git a/runtime/monitor.cc b/runtime/monitor.cc
index 4b41225..dc016a5 100644
--- a/runtime/monitor.cc
+++ b/runtime/monitor.cc
@@ -23,6 +23,7 @@
 
 #include "base/mutex.h"
 #include "base/stl_util.h"
+#include "base/time_utils.h"
 #include "class_linker.h"
 #include "dex_file-inl.h"
 #include "dex_instruction.h"
diff --git a/runtime/monitor_test.cc b/runtime/monitor_test.cc
index 30cb2d8..2a29c60 100644
--- a/runtime/monitor_test.cc
+++ b/runtime/monitor_test.cc
@@ -20,6 +20,7 @@
 #include <string>
 
 #include "atomic.h"
+#include "base/time_utils.h"
 #include "class_linker-inl.h"
 #include "common_runtime_test.h"
 #include "handle_scope-inl.h"
@@ -27,7 +28,6 @@
 #include "mirror/string-inl.h"  // Strings are easiest to allocate
 #include "scoped_thread_state_change.h"
 #include "thread_pool.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/runtime/native/dalvik_system_VMDebug.cc b/runtime/native/dalvik_system_VMDebug.cc
index 46881b0..1078492 100644
--- a/runtime/native/dalvik_system_VMDebug.cc
+++ b/runtime/native/dalvik_system_VMDebug.cc
@@ -22,6 +22,7 @@
 #include <sstream>
 
 #include "base/histogram-inl.h"
+#include "base/time_utils.h"
 #include "class_linker.h"
 #include "common_throws.h"
 #include "debugger.h"
diff --git a/runtime/native/java_lang_reflect_Field.cc b/runtime/native/java_lang_reflect_Field.cc
index 721b7a3..d6aa9b5 100644
--- a/runtime/native/java_lang_reflect_Field.cc
+++ b/runtime/native/java_lang_reflect_Field.cc
@@ -26,6 +26,7 @@
 #include "mirror/field.h"
 #include "reflection-inl.h"
 #include "scoped_fast_native_object_access.h"
+#include "utils.h"
 
 namespace art {
 
diff --git a/runtime/oat.cc b/runtime/oat.cc
index 4f6aabc..1dd2aad 100644
--- a/runtime/oat.cc
+++ b/runtime/oat.cc
@@ -20,8 +20,8 @@
 #include <zlib.h>
 
 #include "arch/instruction_set_features.h"
+#include "base/bit_utils.h"
 #include "base/stringprintf.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/runtime/profiler.cc b/runtime/profiler.cc
index 3b0e6c1..b149d4b 100644
--- a/runtime/profiler.cc
+++ b/runtime/profiler.cc
@@ -23,6 +23,7 @@
 #include <fstream>
 
 #include "base/stl_util.h"
+#include "base/time_utils.h"
 #include "base/unix_file/fd_file.h"
 #include "class_linker.h"
 #include "common_throws.h"
@@ -39,6 +40,7 @@
 #include "ScopedLocalRef.h"
 #include "thread.h"
 #include "thread_list.h"
+#include "utils.h"
 
 #include "entrypoints/quick/quick_entrypoints.h"
 
diff --git a/runtime/read_barrier-inl.h b/runtime/read_barrier-inl.h
index 5631ff4..d341ee1 100644
--- a/runtime/read_barrier-inl.h
+++ b/runtime/read_barrier-inl.h
@@ -24,6 +24,7 @@
 #include "mirror/object_reference.h"
 #include "mirror/reference.h"
 #include "runtime.h"
+#include "utils.h"
 
 namespace art {
 
diff --git a/runtime/signal_catcher.cc b/runtime/signal_catcher.cc
index 863d59b..9f8c55c 100644
--- a/runtime/signal_catcher.cc
+++ b/runtime/signal_catcher.cc
@@ -28,6 +28,7 @@
 #include <sstream>
 
 #include "arch/instruction_set.h"
+#include "base/time_utils.h"
 #include "base/unix_file/fd_file.h"
 #include "class_linker.h"
 #include "gc/heap.h"
diff --git a/runtime/stack.h b/runtime/stack.h
index 5b43848..0db0266 100644
--- a/runtime/stack.h
+++ b/runtime/stack.h
@@ -21,11 +21,11 @@
 #include <string>
 
 #include "arch/instruction_set.h"
+#include "base/bit_utils.h"
 #include "dex_file.h"
 #include "gc_root.h"
 #include "mirror/object_reference.h"
 #include "read_barrier.h"
-#include "utils.h"
 #include "verify_object.h"
 
 namespace art {
diff --git a/runtime/stack_map.h b/runtime/stack_map.h
index f07fb74..c61894c 100644
--- a/runtime/stack_map.h
+++ b/runtime/stack_map.h
@@ -18,8 +18,8 @@
 #define ART_RUNTIME_STACK_MAP_H_
 
 #include "base/bit_vector.h"
+#include "base/bit_utils.h"
 #include "memory_region.h"
-#include "utils.h"
 
 namespace art {
 
diff --git a/runtime/thread.cc b/runtime/thread.cc
index 2145c9c..b3b55c4 100644
--- a/runtime/thread.cc
+++ b/runtime/thread.cc
@@ -33,6 +33,7 @@
 
 #include "arch/context.h"
 #include "art_field-inl.h"
+#include "base/bit_utils.h"
 #include "base/mutex.h"
 #include "base/timing_logger.h"
 #include "base/to_str.h"
diff --git a/runtime/thread.h b/runtime/thread.h
index 9346813..96e0916 100644
--- a/runtime/thread.h
+++ b/runtime/thread.h
@@ -61,6 +61,7 @@
   template<class T> class PrimitiveArray;
   typedef PrimitiveArray<int32_t> IntArray;
   class StackTraceElement;
+  class String;
   class Throwable;
 }  // namespace mirror
 
diff --git a/runtime/thread_linux.cc b/runtime/thread_linux.cc
index 0526f49..0731f30 100644
--- a/runtime/thread_linux.cc
+++ b/runtime/thread_linux.cc
@@ -14,10 +14,11 @@
  * limitations under the License.
  */
 
-#include "thread.h"
-
 #include <signal.h>
 
+#include "thread.h"
+#include "utils.h"
+
 namespace art {
 
 void Thread::SetNativePriority(int) {
diff --git a/runtime/thread_list.cc b/runtime/thread_list.cc
index cc54bbd..7719bb8 100644
--- a/runtime/thread_list.cc
+++ b/runtime/thread_list.cc
@@ -30,6 +30,7 @@
 #include "base/histogram-inl.h"
 #include "base/mutex.h"
 #include "base/mutex-inl.h"
+#include "base/time_utils.h"
 #include "base/timing_logger.h"
 #include "debugger.h"
 #include "jni_internal.h"
@@ -38,7 +39,6 @@
 #include "scoped_thread_state_change.h"
 #include "thread.h"
 #include "trace.h"
-#include "utils.h"
 #include "well_known_classes.h"
 
 namespace art {
diff --git a/runtime/thread_pool.cc b/runtime/thread_pool.cc
index ce76eae..1e84c9d 100644
--- a/runtime/thread_pool.cc
+++ b/runtime/thread_pool.cc
@@ -18,6 +18,7 @@
 
 #include "base/casts.h"
 #include "base/stl_util.h"
+#include "base/time_utils.h"
 #include "runtime.h"
 #include "thread-inl.h"
 
diff --git a/runtime/trace.cc b/runtime/trace.cc
index 7636792..f874716 100644
--- a/runtime/trace.cc
+++ b/runtime/trace.cc
@@ -24,6 +24,7 @@
 
 #include "base/casts.h"
 #include "base/stl_util.h"
+#include "base/time_utils.h"
 #include "base/unix_file/fd_file.h"
 #include "class_linker.h"
 #include "common_throws.h"
@@ -40,6 +41,7 @@
 #include "ScopedLocalRef.h"
 #include "thread.h"
 #include "thread_list.h"
+#include "utils.h"
 #include "entrypoints/quick/quick_entrypoints.h"
 
 namespace art {
diff --git a/runtime/utils.cc b/runtime/utils.cc
index 7986cdc..fabf9bd 100644
--- a/runtime/utils.cc
+++ b/runtime/utils.cc
@@ -204,102 +204,6 @@
   }
 }
 
-std::string GetIsoDate() {
-  time_t now = time(nullptr);
-  tm tmbuf;
-  tm* ptm = localtime_r(&now, &tmbuf);
-  return StringPrintf("%04d-%02d-%02d %02d:%02d:%02d",
-      ptm->tm_year + 1900, ptm->tm_mon+1, ptm->tm_mday,
-      ptm->tm_hour, ptm->tm_min, ptm->tm_sec);
-}
-
-uint64_t MilliTime() {
-#if defined(__linux__)
-  timespec now;
-  clock_gettime(CLOCK_MONOTONIC, &now);
-  return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000) + now.tv_nsec / UINT64_C(1000000);
-#else  // __APPLE__
-  timeval now;
-  gettimeofday(&now, nullptr);
-  return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000) + now.tv_usec / UINT64_C(1000);
-#endif
-}
-
-uint64_t MicroTime() {
-#if defined(__linux__)
-  timespec now;
-  clock_gettime(CLOCK_MONOTONIC, &now);
-  return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000);
-#else  // __APPLE__
-  timeval now;
-  gettimeofday(&now, nullptr);
-  return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_usec;
-#endif
-}
-
-uint64_t NanoTime() {
-#if defined(__linux__)
-  timespec now;
-  clock_gettime(CLOCK_MONOTONIC, &now);
-  return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec;
-#else  // __APPLE__
-  timeval now;
-  gettimeofday(&now, nullptr);
-  return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_usec * UINT64_C(1000);
-#endif
-}
-
-uint64_t ThreadCpuNanoTime() {
-#if defined(__linux__)
-  timespec now;
-  clock_gettime(CLOCK_THREAD_CPUTIME_ID, &now);
-  return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec;
-#else  // __APPLE__
-  UNIMPLEMENTED(WARNING);
-  return -1;
-#endif
-}
-
-void NanoSleep(uint64_t ns) {
-  timespec tm;
-  tm.tv_sec = ns / MsToNs(1000);
-  tm.tv_nsec = ns - static_cast<uint64_t>(tm.tv_sec) * MsToNs(1000);
-  nanosleep(&tm, nullptr);
-}
-
-void InitTimeSpec(bool absolute, int clock, int64_t ms, int32_t ns, timespec* ts) {
-  int64_t endSec;
-
-  if (absolute) {
-#if !defined(__APPLE__)
-    clock_gettime(clock, ts);
-#else
-    UNUSED(clock);
-    timeval tv;
-    gettimeofday(&tv, nullptr);
-    ts->tv_sec = tv.tv_sec;
-    ts->tv_nsec = tv.tv_usec * 1000;
-#endif
-  } else {
-    ts->tv_sec = 0;
-    ts->tv_nsec = 0;
-  }
-  endSec = ts->tv_sec + ms / 1000;
-  if (UNLIKELY(endSec >= 0x7fffffff)) {
-    std::ostringstream ss;
-    LOG(INFO) << "Note: end time exceeds epoch: " << ss.str();
-    endSec = 0x7ffffffe;
-  }
-  ts->tv_sec = endSec;
-  ts->tv_nsec = (ts->tv_nsec + (ms % 1000) * 1000000) + ns;
-
-  // Catch rollover.
-  if (ts->tv_nsec >= 1000000000L) {
-    ts->tv_sec++;
-    ts->tv_nsec -= 1000000000L;
-  }
-}
-
 std::string PrettyDescriptor(mirror::String* java_descriptor) {
   if (java_descriptor == nullptr) {
     return "null";
@@ -578,88 +482,6 @@
                       negative_str, byte_count / kBytesPerUnit[i], kUnitStrings[i]);
 }
 
-std::string PrettyDuration(uint64_t nano_duration, size_t max_fraction_digits) {
-  if (nano_duration == 0) {
-    return "0";
-  } else {
-    return FormatDuration(nano_duration, GetAppropriateTimeUnit(nano_duration),
-                          max_fraction_digits);
-  }
-}
-
-TimeUnit GetAppropriateTimeUnit(uint64_t nano_duration) {
-  const uint64_t one_sec = 1000 * 1000 * 1000;
-  const uint64_t one_ms  = 1000 * 1000;
-  const uint64_t one_us  = 1000;
-  if (nano_duration >= one_sec) {
-    return kTimeUnitSecond;
-  } else if (nano_duration >= one_ms) {
-    return kTimeUnitMillisecond;
-  } else if (nano_duration >= one_us) {
-    return kTimeUnitMicrosecond;
-  } else {
-    return kTimeUnitNanosecond;
-  }
-}
-
-uint64_t GetNsToTimeUnitDivisor(TimeUnit time_unit) {
-  const uint64_t one_sec = 1000 * 1000 * 1000;
-  const uint64_t one_ms  = 1000 * 1000;
-  const uint64_t one_us  = 1000;
-
-  switch (time_unit) {
-    case kTimeUnitSecond:
-      return one_sec;
-    case kTimeUnitMillisecond:
-      return one_ms;
-    case kTimeUnitMicrosecond:
-      return one_us;
-    case kTimeUnitNanosecond:
-      return 1;
-  }
-  return 0;
-}
-
-std::string FormatDuration(uint64_t nano_duration, TimeUnit time_unit,
-                           size_t max_fraction_digits) {
-  const char* unit = nullptr;
-  uint64_t divisor = GetNsToTimeUnitDivisor(time_unit);
-  switch (time_unit) {
-    case kTimeUnitSecond:
-      unit = "s";
-      break;
-    case kTimeUnitMillisecond:
-      unit = "ms";
-      break;
-    case kTimeUnitMicrosecond:
-      unit = "us";
-      break;
-    case kTimeUnitNanosecond:
-      unit = "ns";
-      break;
-  }
-  const uint64_t whole_part = nano_duration / divisor;
-  uint64_t fractional_part = nano_duration % divisor;
-  if (fractional_part == 0) {
-    return StringPrintf("%" PRIu64 "%s", whole_part, unit);
-  } else {
-    static constexpr size_t kMaxDigits = 30;
-    size_t avail_digits = kMaxDigits;
-    char fraction_buffer[kMaxDigits];
-    char* ptr = fraction_buffer;
-    uint64_t multiplier = 10;
-    // This infinite loops if fractional part is 0.
-    while (avail_digits > 1 && fractional_part * multiplier < divisor) {
-      multiplier *= 10;
-      *ptr++ = '0';
-      avail_digits--;
-    }
-    snprintf(ptr, avail_digits, "%" PRIu64, fractional_part);
-    fraction_buffer[std::min(kMaxDigits - 1, max_fraction_digits)] = '\0';
-    return StringPrintf("%" PRIu64 ".%s%s", whole_part, fraction_buffer, unit);
-  }
-}
-
 std::string PrintableChar(uint16_t ch) {
   std::string result;
   result += '\'';
diff --git a/runtime/utils.h b/runtime/utils.h
index 71ccf85..e7532e1 100644
--- a/runtime/utils.h
+++ b/runtime/utils.h
@@ -43,13 +43,6 @@
 class String;
 }  // namespace mirror
 
-enum TimeUnit {
-  kTimeUnitNanosecond,
-  kTimeUnitMicrosecond,
-  kTimeUnitMillisecond,
-  kTimeUnitSecond,
-};
-
 template <typename T>
 bool ParseUint(const char *in, T* out) {
   char* end;
@@ -78,228 +71,6 @@
   return true;
 }
 
-template<typename T>
-static constexpr bool IsPowerOfTwo(T x) {
-  return (x & (x - 1)) == 0;
-}
-
-template<int n, typename T>
-static inline bool IsAligned(T x) {
-  static_assert((n & (n - 1)) == 0, "n is not a power of two");
-  return (x & (n - 1)) == 0;
-}
-
-template<int n, typename T>
-static inline bool IsAligned(T* x) {
-  return IsAligned<n>(reinterpret_cast<const uintptr_t>(x));
-}
-
-template<typename T>
-static inline bool IsAlignedParam(T x, int n) {
-  return (x & (n - 1)) == 0;
-}
-
-#define CHECK_ALIGNED(value, alignment) \
-  CHECK(::art::IsAligned<alignment>(value)) << reinterpret_cast<const void*>(value)
-
-#define DCHECK_ALIGNED(value, alignment) \
-  DCHECK(::art::IsAligned<alignment>(value)) << reinterpret_cast<const void*>(value)
-
-#define DCHECK_ALIGNED_PARAM(value, alignment) \
-  DCHECK(::art::IsAlignedParam(value, alignment)) << reinterpret_cast<const void*>(value)
-
-// Check whether an N-bit two's-complement representation can hold value.
-template <typename T>
-static inline bool IsInt(int N, T value) {
-  int bitsPerT = sizeof(T) * kBitsPerByte;
-  if (N == bitsPerT) {
-    return true;
-  } else {
-    CHECK_LT(0, N);
-    CHECK_LT(N, bitsPerT);
-    T limit = static_cast<T>(1) << (N - 1);
-    return (-limit <= value) && (value < limit);
-  }
-}
-
-template <typename T>
-static constexpr T GetIntLimit(size_t bits) {
-  return
-      DCHECK_CONSTEXPR(bits > 0, "bits cannot be zero", 0)
-      DCHECK_CONSTEXPR(bits < kBitsPerByte * sizeof(T), "kBits must be < max.", 0)
-      static_cast<T>(1) << (bits - 1);
-}
-
-template <size_t kBits, typename T>
-static constexpr bool IsInt(T value) {
-  static_assert(kBits > 0, "kBits cannot be zero.");
-  static_assert(kBits <= kBitsPerByte * sizeof(T), "kBits must be <= max.");
-  static_assert(std::is_signed<T>::value, "Needs a signed type.");
-  // Corner case for "use all bits." Can't use the limits, as they would overflow, but it is
-  // trivially true.
-  return (kBits == kBitsPerByte * sizeof(T)) ?
-      true :
-      (-GetIntLimit<T>(kBits) <= value) && (value < GetIntLimit<T>(kBits));
-}
-
-template <size_t kBits, typename T>
-static constexpr bool IsUint(T value) {
-  static_assert(kBits > 0, "kBits cannot be zero.");
-  static_assert(kBits <= kBitsPerByte * sizeof(T), "kBits must be <= max.");
-  static_assert(std::is_integral<T>::value, "Needs an integral type.");
-  // Corner case for "use all bits." Can't use the limits, as they would overflow, but it is
-  // trivially true.
-  return (0 <= value) &&
-      (kBits == kBitsPerByte * sizeof(T) ||
-          (static_cast<typename std::make_unsigned<T>::type>(value) <=
-               GetIntLimit<typename std::make_unsigned<T>::type>(kBits + 1) - 1));
-}
-
-template <size_t kBits, typename T>
-static constexpr bool IsAbsoluteUint(T value) {
-  static_assert(kBits <= kBitsPerByte * sizeof(T), "kBits must be < max.");
-  return (kBits == kBitsPerByte * sizeof(T)) ?
-      true :
-      IsUint<kBits, T>(value < 0 ? -value : value);
-}
-
-static inline uint16_t Low16Bits(uint32_t value) {
-  return static_cast<uint16_t>(value);
-}
-
-static inline uint16_t High16Bits(uint32_t value) {
-  return static_cast<uint16_t>(value >> 16);
-}
-
-static inline uint32_t Low32Bits(uint64_t value) {
-  return static_cast<uint32_t>(value);
-}
-
-static inline uint32_t High32Bits(uint64_t value) {
-  return static_cast<uint32_t>(value >> 32);
-}
-
-// Traits class providing an unsigned integer type of (byte) size `n`.
-template <size_t n>
-struct UnsignedIntegerType {
-  // No defined `type`.
-};
-
-template <>
-struct UnsignedIntegerType<1> { typedef uint8_t type; };
-
-template <>
-struct UnsignedIntegerType<2> { typedef uint16_t type; };
-
-template <>
-struct UnsignedIntegerType<4> { typedef uint32_t type; };
-
-template <>
-struct UnsignedIntegerType<8> { typedef uint64_t type; };
-
-// Type identity.
-template <typename T>
-struct TypeIdentity {
-  typedef T type;
-};
-
-// Like sizeof, but count how many bits a type takes. Pass type explicitly.
-template <typename T>
-static constexpr size_t BitSizeOf() {
-  return sizeof(T) * CHAR_BIT;
-}
-
-// Like sizeof, but count how many bits a type takes. Infers type from parameter.
-template <typename T>
-static constexpr size_t BitSizeOf(T /*x*/) {
-  return sizeof(T) * CHAR_BIT;
-}
-
-// For rounding integers.
-template<typename T>
-static constexpr T RoundDown(T x, typename TypeIdentity<T>::type n) WARN_UNUSED;
-
-template<typename T>
-static constexpr T RoundDown(T x, typename TypeIdentity<T>::type n) {
-  return
-      DCHECK_CONSTEXPR(IsPowerOfTwo(n), , T(0))
-      (x & -n);
-}
-
-template<typename T>
-static constexpr T RoundUp(T x, typename TypeIdentity<T>::type n) WARN_UNUSED;
-
-template<typename T>
-static constexpr T RoundUp(T x, typename TypeIdentity<T>::type n) {
-  return RoundDown(x + n - 1, n);
-}
-
-// For aligning pointers.
-template<typename T>
-static inline T* AlignDown(T* x, uintptr_t n) WARN_UNUSED;
-
-template<typename T>
-static inline T* AlignDown(T* x, uintptr_t n) {
-  return reinterpret_cast<T*>(RoundDown(reinterpret_cast<uintptr_t>(x), n));
-}
-
-template<typename T>
-static inline T* AlignUp(T* x, uintptr_t n) WARN_UNUSED;
-
-template<typename T>
-static inline T* AlignUp(T* x, uintptr_t n) {
-  return reinterpret_cast<T*>(RoundUp(reinterpret_cast<uintptr_t>(x), n));
-}
-
-namespace utils {
-namespace detail {  // Private, implementation-specific namespace. Do not poke outside of this file.
-template <typename T>
-static constexpr inline T RoundUpToPowerOfTwoRecursive(T x, size_t bit) {
-  return bit == (BitSizeOf<T>()) ? x: RoundUpToPowerOfTwoRecursive(x | x >> bit, bit << 1);
-}
-}  // namespace detail
-}  // namespace utils
-
-// Recursive implementation is from "Hacker's Delight" by Henry S. Warren, Jr.,
-// figure 3-3, page 48, where the function is called clp2.
-template <typename T>
-static constexpr inline T RoundUpToPowerOfTwo(T x) {
-  return art::utils::detail::RoundUpToPowerOfTwoRecursive(x - 1, 1) + 1;
-}
-
-// Find the bit position of the most significant bit (0-based), or -1 if there were no bits set.
-template <typename T>
-static constexpr ssize_t MostSignificantBit(T value) {
-  return (value == 0) ? -1 : (MostSignificantBit(value >> 1) + 1);
-}
-
-// How many bits (minimally) does it take to store the constant 'value'? i.e. 1 for 1, 3 for 5, etc.
-template <typename T>
-static constexpr size_t MinimumBitsToStore(T value) {
-  return static_cast<size_t>(MostSignificantBit(value) + 1);
-}
-
-template<typename T>
-static constexpr int CLZ(T x) {
-  static_assert(sizeof(T) <= sizeof(long long), "T too large, must be smaller than long long");  // NOLINT [runtime/int] [4]
-  return (sizeof(T) == sizeof(uint32_t))
-      ? __builtin_clz(x)  // TODO: __builtin_clz[ll] has undefined behavior for x=0
-      : __builtin_clzll(x);
-}
-
-template<typename T>
-static constexpr int CTZ(T x) {
-  return (sizeof(T) == sizeof(uint32_t))
-      ? __builtin_ctz(x)
-      : __builtin_ctzll(x);
-}
-
-template<typename T>
-static inline int WhichPowerOf2(T x) {
-  DCHECK((x != 0) && IsPowerOfTwo(x));
-  return CTZ(x);
-}
-
 // Return whether x / divisor == x * (1.0f / divisor), for every float x.
 static constexpr bool CanDivideByReciprocalMultiplyFloat(int32_t divisor) {
   // True, if the most significant bits of divisor are 0.
@@ -312,13 +83,6 @@
   return ((divisor & ((UINT64_C(1) << 52) - 1)) == 0);
 }
 
-template<typename T>
-static constexpr int POPCOUNT(T x) {
-  return (sizeof(T) == sizeof(uint32_t))
-      ? __builtin_popcount(x)
-      : __builtin_popcountll(x);
-}
-
 static inline uint32_t PointerToLowMemUInt32(const void* p) {
   uintptr_t intp = reinterpret_cast<uintptr_t>(p);
   DCHECK_LE(intp, 0xFFFFFFFFU);
@@ -392,21 +156,6 @@
 // Returns a human-readable size string such as "1MB".
 std::string PrettySize(int64_t size_in_bytes);
 
-// Returns a human-readable time string which prints every nanosecond while trying to limit the
-// number of trailing zeros. Prints using the largest human readable unit up to a second.
-// e.g. "1ms", "1.000000001s", "1.001us"
-std::string PrettyDuration(uint64_t nano_duration, size_t max_fraction_digits = 3);
-
-// Format a nanosecond time to specified units.
-std::string FormatDuration(uint64_t nano_duration, TimeUnit time_unit,
-                           size_t max_fraction_digits);
-
-// Get the appropriate unit for a nanosecond duration.
-TimeUnit GetAppropriateTimeUnit(uint64_t nano_duration);
-
-// Get the divisor to convert from a nanoseconds to a time unit.
-uint64_t GetNsToTimeUnitDivisor(TimeUnit time_unit);
-
 // Performs JNI name mangling as described in section 11.3 "Linking Native Methods"
 // of the JNI spec.
 std::string MangleForJni(const std::string& s);
@@ -441,43 +190,6 @@
 bool ReadFileToString(const std::string& file_name, std::string* result);
 bool PrintFileToLog(const std::string& file_name, LogSeverity level);
 
-// Returns the current date in ISO yyyy-mm-dd hh:mm:ss format.
-std::string GetIsoDate();
-
-// Returns the monotonic time since some unspecified starting point in milliseconds.
-uint64_t MilliTime();
-
-// Returns the monotonic time since some unspecified starting point in microseconds.
-uint64_t MicroTime();
-
-// Returns the monotonic time since some unspecified starting point in nanoseconds.
-uint64_t NanoTime();
-
-// Returns the thread-specific CPU-time clock in nanoseconds or -1 if unavailable.
-uint64_t ThreadCpuNanoTime();
-
-// Converts the given number of nanoseconds to milliseconds.
-static constexpr inline uint64_t NsToMs(uint64_t ns) {
-  return ns / 1000 / 1000;
-}
-
-// Converts the given number of milliseconds to nanoseconds
-static constexpr inline uint64_t MsToNs(uint64_t ns) {
-  return ns * 1000 * 1000;
-}
-
-#if defined(__APPLE__)
-// No clocks to specify on OS/X, fake value to pass to routines that require a clock.
-#define CLOCK_REALTIME 0xebadf00d
-#endif
-
-// Sleep for the given number of nanoseconds, a bad way to handle contention.
-void NanoSleep(uint64_t ns);
-
-// Initialize a timespec to either a relative time (ms,ns), or to the absolute
-// time corresponding to the indicated clock value plus the supplied offset.
-void InitTimeSpec(bool absolute, int clock, int64_t ms, int32_t ns, timespec* ts);
-
 // Splits a string using the given separator character into a vector of
 // strings. Empty strings will be omitted.
 void Split(const std::string& s, char separator, std::vector<std::string>* result);
diff --git a/runtime/utils_test.cc b/runtime/utils_test.cc
index 869d305..8a7f805 100644
--- a/runtime/utils_test.cc
+++ b/runtime/utils_test.cc
@@ -172,35 +172,6 @@
   EXPECT_EQ("512B", PrettySize(512));
 }
 
-TEST_F(UtilsTest, PrettyDuration) {
-  const uint64_t one_sec = 1000000000;
-  const uint64_t one_ms  = 1000000;
-  const uint64_t one_us  = 1000;
-
-  EXPECT_EQ("1s", PrettyDuration(1 * one_sec));
-  EXPECT_EQ("10s", PrettyDuration(10 * one_sec));
-  EXPECT_EQ("100s", PrettyDuration(100 * one_sec));
-  EXPECT_EQ("1.001s", PrettyDuration(1 * one_sec + one_ms));
-  EXPECT_EQ("1.000001s", PrettyDuration(1 * one_sec + one_us, 6));
-  EXPECT_EQ("1.000000001s", PrettyDuration(1 * one_sec + 1, 9));
-  EXPECT_EQ("1.000s", PrettyDuration(1 * one_sec + one_us, 3));
-
-  EXPECT_EQ("1ms", PrettyDuration(1 * one_ms));
-  EXPECT_EQ("10ms", PrettyDuration(10 * one_ms));
-  EXPECT_EQ("100ms", PrettyDuration(100 * one_ms));
-  EXPECT_EQ("1.001ms", PrettyDuration(1 * one_ms + one_us));
-  EXPECT_EQ("1.000001ms", PrettyDuration(1 * one_ms + 1, 6));
-
-  EXPECT_EQ("1us", PrettyDuration(1 * one_us));
-  EXPECT_EQ("10us", PrettyDuration(10 * one_us));
-  EXPECT_EQ("100us", PrettyDuration(100 * one_us));
-  EXPECT_EQ("1.001us", PrettyDuration(1 * one_us + 1));
-
-  EXPECT_EQ("1ns", PrettyDuration(1));
-  EXPECT_EQ("10ns", PrettyDuration(10));
-  EXPECT_EQ("100ns", PrettyDuration(100));
-}
-
 TEST_F(UtilsTest, MangleForJni) {
   ScopedObjectAccess soa(Thread::Current());
   EXPECT_EQ("hello_00024world", MangleForJni("hello$world"));
@@ -408,119 +379,6 @@
   }
 }
 
-TEST_F(UtilsTest, RoundUpToPowerOfTwo) {
-  // Tests the constexpr variant since all the parameters are constexpr
-  EXPECT_EQ(0, RoundUpToPowerOfTwo(0));
-  EXPECT_EQ(1, RoundUpToPowerOfTwo(1));
-  EXPECT_EQ(2, RoundUpToPowerOfTwo(2));
-  EXPECT_EQ(4, RoundUpToPowerOfTwo(3));
-  EXPECT_EQ(8, RoundUpToPowerOfTwo(7));
-
-  EXPECT_EQ(0b10000L, RoundUpToPowerOfTwo(0b01101L));
-  EXPECT_EQ(1ULL << 63, RoundUpToPowerOfTwo(1ULL << 62 | 1ULL));
-}
-
-TEST_F(UtilsTest, MostSignificantBit) {
-  EXPECT_EQ(-1, MostSignificantBit(0));
-  EXPECT_EQ(0, MostSignificantBit(1));
-  EXPECT_EQ(31, MostSignificantBit(~static_cast<uint32_t>(0)));
-  EXPECT_EQ(2, MostSignificantBit(0b110));
-  EXPECT_EQ(2, MostSignificantBit(0b100));
-}
-
-TEST_F(UtilsTest, MinimumBitsToStore) {
-  EXPECT_EQ(0u, MinimumBitsToStore(0));
-  EXPECT_EQ(1u, MinimumBitsToStore(1));
-  EXPECT_EQ(2u, MinimumBitsToStore(0b10));
-  EXPECT_EQ(2u, MinimumBitsToStore(0b11));
-  EXPECT_EQ(3u, MinimumBitsToStore(0b100));
-  EXPECT_EQ(3u, MinimumBitsToStore(0b110));
-  EXPECT_EQ(3u, MinimumBitsToStore(0b101));
-  EXPECT_EQ(8u, MinimumBitsToStore(0xFF));
-  EXPECT_EQ(32u, MinimumBitsToStore(~static_cast<uint32_t>(0)));
-}
-
-static constexpr int64_t INT_MIN_minus1 = static_cast<int64_t>(INT_MIN) - 1;
-static constexpr int64_t INT_MAX_plus1 = static_cast<int64_t>(INT_MAX) + 1;
-static constexpr int64_t UINT_MAX_plus1 = static_cast<int64_t>(UINT_MAX) + 1;
-
-TEST_F(UtilsTest, IsInt) {
-  EXPECT_FALSE(IsInt(1, -2));
-  EXPECT_TRUE(IsInt(1, -1));
-  EXPECT_TRUE(IsInt(1, 0));
-  EXPECT_FALSE(IsInt(1, 1));
-
-  EXPECT_FALSE(IsInt(4, -9));
-  EXPECT_TRUE(IsInt(4, -8));
-  EXPECT_TRUE(IsInt(4, 7));
-  EXPECT_FALSE(IsInt(4, 8));
-
-  EXPECT_FALSE(IsInt(32, INT_MIN_minus1));
-  EXPECT_TRUE(IsInt(32, INT_MIN));
-  EXPECT_TRUE(IsInt(32, INT_MAX));
-  EXPECT_FALSE(IsInt(32, INT_MAX_plus1));
-}
-
-TEST_F(UtilsTest, IsInt_Static) {
-  EXPECT_FALSE(IsInt<1>(-2));
-  EXPECT_TRUE(IsInt<1>(-1));
-  EXPECT_TRUE(IsInt<1>(0));
-  EXPECT_FALSE(IsInt<1>(1));
-
-  EXPECT_FALSE(IsInt<4>(-9));
-  EXPECT_TRUE(IsInt<4>(-8));
-  EXPECT_TRUE(IsInt<4>(7));
-  EXPECT_FALSE(IsInt<4>(8));
-
-  EXPECT_FALSE(IsInt<32>(INT_MIN_minus1));
-  EXPECT_TRUE(IsInt<32>(INT_MIN));
-  EXPECT_TRUE(IsInt<32>(INT_MAX));
-  EXPECT_FALSE(IsInt<32>(INT_MAX_plus1));
-}
-
-TEST_F(UtilsTest, IsUint) {
-  EXPECT_FALSE(IsUint<1>(-1));
-  EXPECT_TRUE(IsUint<1>(0));
-  EXPECT_TRUE(IsUint<1>(1));
-  EXPECT_FALSE(IsUint<1>(2));
-
-  EXPECT_FALSE(IsUint<4>(-1));
-  EXPECT_TRUE(IsUint<4>(0));
-  EXPECT_TRUE(IsUint<4>(15));
-  EXPECT_FALSE(IsUint<4>(16));
-
-  EXPECT_FALSE(IsUint<32>(-1));
-  EXPECT_TRUE(IsUint<32>(0));
-  EXPECT_TRUE(IsUint<32>(UINT_MAX));
-  EXPECT_FALSE(IsUint<32>(UINT_MAX_plus1));
-}
-
-TEST_F(UtilsTest, IsAbsoluteUint) {
-  EXPECT_FALSE(IsAbsoluteUint<1>(-2));
-  EXPECT_TRUE(IsAbsoluteUint<1>(-1));
-  EXPECT_TRUE(IsAbsoluteUint<32>(0));
-  EXPECT_TRUE(IsAbsoluteUint<1>(1));
-  EXPECT_FALSE(IsAbsoluteUint<1>(2));
-
-  EXPECT_FALSE(IsAbsoluteUint<4>(-16));
-  EXPECT_TRUE(IsAbsoluteUint<4>(-15));
-  EXPECT_TRUE(IsAbsoluteUint<32>(0));
-  EXPECT_TRUE(IsAbsoluteUint<4>(15));
-  EXPECT_FALSE(IsAbsoluteUint<4>(16));
-
-  EXPECT_FALSE(IsAbsoluteUint<32>(-UINT_MAX_plus1));
-  EXPECT_TRUE(IsAbsoluteUint<32>(-UINT_MAX));
-  EXPECT_TRUE(IsAbsoluteUint<32>(0));
-  EXPECT_TRUE(IsAbsoluteUint<32>(UINT_MAX));
-  EXPECT_FALSE(IsAbsoluteUint<32>(UINT_MAX_plus1));
-}
-
-TEST_F(UtilsTest, TestSleep) {
-  auto start = NanoTime();
-  NanoSleep(MsToNs(1500));
-  EXPECT_GT(NanoTime() - start, MsToNs(1000));
-}
-
 TEST_F(UtilsTest, IsValidDescriptor) {
   std::vector<uint8_t> descriptor(
       { 'L', 'a', '/', 'b', '$', 0xed, 0xa0, 0x80, 0xed, 0xb0, 0x80, ';', 0x00 });
diff --git a/runtime/verifier/method_verifier.cc b/runtime/verifier/method_verifier.cc
index 1b1bc54..d401bd3 100644
--- a/runtime/verifier/method_verifier.cc
+++ b/runtime/verifier/method_verifier.cc
@@ -21,6 +21,7 @@
 #include "art_field-inl.h"
 #include "base/logging.h"
 #include "base/mutex-inl.h"
+#include "base/time_utils.h"
 #include "class_linker.h"
 #include "compiler_callbacks.h"
 #include "dex_file-inl.h"
@@ -41,6 +42,7 @@
 #include "register_line-inl.h"
 #include "runtime.h"
 #include "scoped_thread_state_change.h"
+#include "utils.h"
 #include "handle_scope-inl.h"
 #include "verifier/dex_gc_map.h"