diff --git a/compiler/Android.mk b/compiler/Android.mk
index 77dc367..12b8afb 100644
--- a/compiler/Android.mk
+++ b/compiler/Android.mk
@@ -50,6 +50,7 @@
 	dex/quick/x86/target_x86.cc \
 	dex/quick/x86/utility_x86.cc \
 	dex/dex_to_dex_compiler.cc \
+	dex/mir_annotations.cc \
 	dex/mir_dataflow.cc \
 	dex/mir_optimization.cc \
 	dex/pass_driver.cc \
diff --git a/compiler/dex/bb_optimizations.h b/compiler/dex/bb_optimizations.h
index 1286a8e..f336231 100644
--- a/compiler/dex/bb_optimizations.h
+++ b/compiler/dex/bb_optimizations.h
@@ -23,6 +23,20 @@
 namespace art {
 
 /**
+ * @class AnnotateUsedFields
+ * @brief Perform the annotation of fields for IGET/IPUT/SGET/SPUT insns.
+ */
+class AnnotateUsedFields : public Pass {
+ public:
+  AnnotateUsedFields() : Pass("AnnotateInstanceFields", kNoNodes) {
+  }
+
+  void Start(CompilationUnit* cUnit) const {
+    cUnit->mir_graph->DoAnnotateUsedFields();
+  }
+};
+
+/**
  * @class CodeLayout
  * @brief Perform the code layout pass.
  */
diff --git a/compiler/dex/mir_analysis.cc b/compiler/dex/mir_analysis.cc
index ab55333..b739d5f 100644
--- a/compiler/dex/mir_analysis.cc
+++ b/compiler/dex/mir_analysis.cc
@@ -14,10 +14,14 @@
  * limitations under the License.
  */
 
+#include <algorithm>
 #include "compiler_internals.h"
 #include "dataflow_iterator-inl.h"
+#include "dex_instruction.h"
+#include "dex_instruction-inl.h"
 #include "dex/quick/dex_file_method_inliner.h"
 #include "dex/quick/dex_file_to_method_inliner_map.h"
+#include "UniquePtr.h"
 
 namespace art {
 
@@ -1082,4 +1086,110 @@
   return ComputeSkipCompilation(&stats, skip_compilation);
 }
 
+void MIRGraph::DoAnnotateUsedFields() {
+  // Try to use stack-allocated array, resort to heap if we exceed the initial size.
+  static constexpr size_t kInitialSize = 32;
+  uint16_t stack_idxs[kInitialSize];
+  UniquePtr<uint16_t[]> allocated_idxs;
+  uint16_t* field_idxs = stack_idxs;
+  size_t size = kInitialSize;
+
+  // Find IGET/IPUT/SGET/SPUT insns, store IGET/IPUT fields at the beginning, SGET/SPUT at the end.
+  size_t ifield_pos = 0u;
+  size_t sfield_pos = size;
+  AllNodesIterator iter(this);
+  for (BasicBlock* bb = iter.Next(); bb != nullptr; bb = iter.Next()) {
+    if (bb->block_type != kDalvikByteCode) {
+      continue;
+    }
+    for (MIR* mir = bb->first_mir_insn; mir != nullptr; mir = mir->next) {
+      if (mir->dalvikInsn.opcode >= Instruction::IGET &&
+          mir->dalvikInsn.opcode <= Instruction::SPUT_SHORT) {
+        bool need_alloc = false;
+        const Instruction* insn = Instruction::At(current_code_item_->insns_ + mir->offset);
+        uint16_t field_idx;
+        // Get field index and try to find it among existing indexes. If found, it's usually among
+        // the last few added, so we'll start the search from ifield_pos/sfield_pos. Though this
+        // is a linear search, it actually performs much better than map based approach.
+        if (mir->dalvikInsn.opcode <= Instruction::IPUT_SHORT) {
+          field_idx = insn->VRegC_22c();
+          size_t i = ifield_pos;
+          while (i != 0u && field_idxs[i - 1] != field_idx) {
+            --i;
+          }
+          if (i != 0u) {
+            mir->meta.ifield_annotation = i - 1;
+          } else {
+            mir->meta.ifield_annotation = ifield_pos;
+            if (UNLIKELY(ifield_pos == sfield_pos)) {
+              need_alloc = true;
+            } else {
+              field_idxs[ifield_pos++] = field_idx;
+            }
+          }
+        } else {
+          field_idx = insn->VRegB_21c();
+          size_t i = sfield_pos;
+          while (i != size && field_idxs[i] != field_idx) {
+            ++i;
+          }
+          if (i != size) {
+            mir->meta.sfield_annotation = size - i - 1u;
+          } else {
+            mir->meta.sfield_annotation = size - sfield_pos;
+            if (UNLIKELY(ifield_pos == sfield_pos)) {
+              need_alloc = true;
+            } else {
+              field_idxs[--sfield_pos] = field_idx;
+            }
+          }
+        }
+        if (UNLIKELY(need_alloc)) {
+          DCHECK(field_idxs == stack_idxs);
+          // All IGET/IPUT/SGET/SPUT instructions take 2 code units and there must also be a RETURN.
+          uint32_t max_refs = (current_code_item_->insns_size_in_code_units_ - 1u) / 2u;
+          allocated_idxs.reset(new uint16_t[max_refs]);
+          field_idxs = allocated_idxs.get();
+          size_t sfield_count = size - sfield_pos;
+          sfield_pos = max_refs - sfield_count;
+          size = max_refs;
+          memcpy(field_idxs, stack_idxs, ifield_pos * sizeof(field_idxs[0]));
+          memcpy(field_idxs + sfield_pos, stack_idxs + ifield_pos,
+                 sfield_count * sizeof(field_idxs[0]));
+          if (mir->dalvikInsn.opcode <= Instruction::IPUT_SHORT) {
+            field_idxs[ifield_pos++] = field_idx;
+          } else {
+            field_idxs[--sfield_pos] = field_idx;
+          }
+        }
+        DCHECK_LE(ifield_pos, sfield_pos);
+      }
+    }
+  }
+
+  if (ifield_pos != 0u) {
+    // Annotate instance fields.
+    DCHECK_EQ(ifield_annotations_.Size(), 0u);
+    ifield_annotations_.Resize(ifield_pos);
+    for (size_t pos = 0u; pos != ifield_pos; ++pos) {
+      ifield_annotations_.Insert(IFieldAnnotation(field_idxs[pos]));
+    }
+    IFieldAnnotation::Resolve(GetCurrentDexCompilationUnit(),
+                              ifield_annotations_.GetRawStorage(), ifield_pos);
+  }
+
+  if (sfield_pos != size) {
+    // Annotate static fields.
+    DCHECK_EQ(sfield_annotations_.Size(), 0u);
+    sfield_annotations_.Resize(size - sfield_pos);
+    for (size_t pos = size; pos != sfield_pos;) {
+      --pos;
+      sfield_annotations_.Insert(SFieldAnnotation(field_idxs[pos]));
+    }
+    SFieldAnnotation::Resolve(GetCurrentDexCompilationUnit(),
+                              sfield_annotations_.GetRawStorage(),
+                              size - sfield_pos);
+  }
+}
+
 }  // namespace art
diff --git a/compiler/dex/mir_annotations.cc b/compiler/dex/mir_annotations.cc
new file mode 100644
index 0000000..eba64d7
--- /dev/null
+++ b/compiler/dex/mir_annotations.cc
@@ -0,0 +1,195 @@
+/*
+ * Copyright (C) 2014 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 "mir_annotations.h"
+
+#include <string.h>
+
+#include "base/logging.h"
+#include "class_linker.h"
+#include "compiler_ir.h"
+#include "driver/dex_compilation_unit.h"
+#include "mirror/class.h"
+#include "mirror/class-inl.h"
+#include "mirror/art_field.h"
+#include "mirror/art_field-inl.h"
+#include "mirror/art_method.h"
+#include "mirror/art_method-inl.h"
+#include "scoped_thread_state_change.h"
+
+namespace art {
+
+void IFieldAnnotation::Resolve(const DexCompilationUnit* mUnit,
+                               IFieldAnnotation* annotations, size_t count) {
+  if (kIsDebugBuild) {
+    DCHECK(annotations != nullptr);
+    DCHECK_NE(count, 0u);
+    for (auto it = annotations, end = annotations + count; it != end; ++it) {
+      IFieldAnnotation unresolved(it->field_idx_);
+      DCHECK_EQ(memcmp(&unresolved, &*it, sizeof(*it)), 0);
+    }
+  }
+
+  const DexFile* dex_file = mUnit->GetDexFile();
+  ClassLinker* class_linker = mUnit->GetClassLinker();
+  uint32_t referrer_class_idx = dex_file->GetMethodId(mUnit->GetDexMethodIndex()).class_idx_;
+
+  // We're going to resolve fields and check access in a tight loop. It's better to hold
+  // the lock and needed references once than re-acquiring them again and again.
+  ScopedObjectAccess soa(Thread::Current());
+  SirtRef<mirror::DexCache> dex_cache(soa.Self(), class_linker->FindDexCache(*dex_file));
+  SirtRef<mirror::ClassLoader> class_loader(
+      soa.Self(), soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader()));
+  SirtRef<mirror::Class> referrer_class(soa.Self(),
+      class_linker->ResolveType(*dex_file, referrer_class_idx, dex_cache, class_loader));
+  if (UNLIKELY(referrer_class.get() == nullptr)) {
+    // Clean up any exception left by type resolution
+    DCHECK(soa.Self()->IsExceptionPending());
+    soa.Self()->ClearException();
+    // We're compiling a method without class definition. We may still resolve fields
+    // and update annotations, so fall through and check again in the loop.
+  }
+
+  for (auto it = annotations, end = annotations + count; it != end; ++it) {
+    uint32_t field_idx = it->field_idx_;
+    mirror::ArtField* resolved_field =
+        class_linker->ResolveField(*dex_file, field_idx, dex_cache, class_loader, false);
+    if (UNLIKELY(resolved_field == nullptr)) {
+      DCHECK(soa.Self()->IsExceptionPending());
+      soa.Self()->ClearException();
+      continue;
+    }
+    DCHECK(!soa.Self()->IsExceptionPending());
+    if (UNLIKELY(resolved_field->IsStatic())) {
+      continue;
+    }
+    mirror::Class* fields_class = resolved_field->GetDeclaringClass();
+    it->is_volatile_ = resolved_field->IsVolatile() ? 1u : 0u;
+    it->field_offset_ = resolved_field->GetOffset();
+    it->declaring_dex_file_ = fields_class->GetDexCache()->GetDexFile();
+    it->declaring_class_idx_ = fields_class->GetDexTypeIndex();
+    it->declaring_field_idx_ = resolved_field->GetDexFieldIndex();
+    if (UNLIKELY(referrer_class.get() == nullptr)) {
+      continue;
+    }
+    if (referrer_class->CanAccessResolvedField(fields_class, resolved_field,
+                                               dex_cache.get(), field_idx)) {
+      it->fast_get_ = 1u;
+      if (!resolved_field->IsFinal() || fields_class == referrer_class.get()) {
+        it->fast_put_ = 1u;
+      }
+    }
+  }
+}
+
+void SFieldAnnotation::Resolve(const DexCompilationUnit* mUnit,
+                               SFieldAnnotation* annotations, size_t count) {
+  if (kIsDebugBuild) {
+    DCHECK(annotations != nullptr);
+    DCHECK_NE(count, 0u);
+    for (auto it = annotations, end = annotations + count; it != end; ++it) {
+      SFieldAnnotation unresolved(it->field_idx_);
+      DCHECK_EQ(memcmp(&unresolved, &*it, sizeof(*it)), 0);
+    }
+  }
+
+  const DexFile* dex_file = mUnit->GetDexFile();
+  ClassLinker* class_linker = mUnit->GetClassLinker();
+  uint32_t referrer_class_idx = dex_file->GetMethodId(mUnit->GetDexMethodIndex()).class_idx_;
+
+  // We're going to resolve fields and check access in a tight loop. It's better to hold
+  // the lock and needed references once than re-acquiring them again and again.
+  ScopedObjectAccess soa(Thread::Current());
+  SirtRef<mirror::DexCache> dex_cache(soa.Self(), class_linker->FindDexCache(*dex_file));
+  SirtRef<mirror::ClassLoader> class_loader(
+      soa.Self(), soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader()));
+  SirtRef<mirror::Class> referrer_class(soa.Self(),
+      class_linker->ResolveType(*dex_file, referrer_class_idx, dex_cache, class_loader));
+  if (UNLIKELY(referrer_class.get() == nullptr)) {
+    DCHECK(soa.Self()->IsExceptionPending());
+    soa.Self()->ClearException();
+    // We're compiling a method without class definition. We may still resolve fields
+    // and update annotations, so fall through and check again in the loop.
+  }
+
+  for (auto it = annotations, end = annotations + count; it != end; ++it) {
+    uint32_t field_idx = it->field_idx_;
+    mirror::ArtField* resolved_field =
+        class_linker->ResolveField(*dex_file, field_idx, dex_cache, class_loader, true);
+    if (UNLIKELY(resolved_field == nullptr)) {
+      // Clean up the exception left by field resolution
+      DCHECK(soa.Self()->IsExceptionPending());
+      soa.Self()->ClearException();
+      continue;
+    }
+    DCHECK(!soa.Self()->IsExceptionPending());
+    if (UNLIKELY(!resolved_field->IsStatic())) {
+      continue;
+    }
+    mirror::Class* fields_class = resolved_field->GetDeclaringClass();
+    it->is_volatile_ = resolved_field->IsVolatile() ? 1u : 0u;
+    it->field_offset_ = resolved_field->GetOffset();
+    it->declaring_dex_file_ = fields_class->GetDexCache()->GetDexFile();
+    it->declaring_class_idx_ = fields_class->GetDexTypeIndex();
+    it->declaring_field_idx_ = resolved_field->GetDexFieldIndex();
+    if (UNLIKELY(referrer_class.get() == nullptr)) {
+      continue;
+    }
+    if (fields_class == referrer_class.get()) {
+      it->fast_get_ = 1u;
+      it->fast_put_ = 1u;
+      it->is_referrers_class_ = 1u;  // implies no worrying about class initialization
+      it->is_initialized_ = 1u;
+      it->storage_index_ = fields_class->GetDexTypeIndex();
+      continue;
+    }
+    if (referrer_class->CanAccessResolvedField(fields_class, resolved_field,
+                                               dex_cache.get(), field_idx)) {
+      // We have the resolved field, we must make it into a index for the referrer
+      // in its static storage (which may fail if it doesn't have a slot for it)
+      // TODO: for images we can elide the static storage base null check
+      // if we know there's a non-null entry in the image
+      if (LIKELY(fields_class->GetDexCache() == dex_cache.get())) {
+        // common case where the dex cache of both the referrer and the field are the same,
+        // no need to search the dex file
+        it->storage_index_ = fields_class->GetDexTypeIndex();
+      } else {
+        // Search dex file for localized ssb index, may fail if field's class is a parent
+        // of the class mentioned in the dex file and there is no dex cache entry.
+        const DexFile::StringId* string_id =
+            dex_file->FindStringId(FieldHelper(resolved_field).GetDeclaringClassDescriptor());
+        if (string_id == nullptr) {
+          continue;
+        }
+        const DexFile::TypeId* type_id =
+           dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id));
+        if (type_id == nullptr) {
+          continue;
+        }
+        // medium path, needs check of static storage base being initialized
+        it->storage_index_ = dex_file->GetIndexForTypeId(*type_id);
+      }
+      it->fast_get_ = 1u;
+      it->fast_put_ = resolved_field->IsFinal() ? 0u : 1u;
+      DCHECK_EQ(it->is_referrers_class_, 0u);
+      it->is_initialized_ = fields_class->IsInitialized() &&
+          mUnit->GetCompilationUnit()->compiler_driver->CanAssumeTypeIsPresentInDexCache(
+              *dex_file, it->storage_index_);
+    }
+  }
+}
+
+}  // namespace art
diff --git a/compiler/dex/mir_annotations.h b/compiler/dex/mir_annotations.h
new file mode 100644
index 0000000..85761de
--- /dev/null
+++ b/compiler/dex/mir_annotations.h
@@ -0,0 +1,215 @@
+/*
+ * Copyright (C) 2014 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_COMPILER_DEX_MIR_ANNOTATIONS_H_
+#define ART_COMPILER_DEX_MIR_ANNOTATIONS_H_
+
+#include "base/macros.h"
+#include "dex_file.h"
+#include "offsets.h"
+
+namespace art {
+
+class DexCompilationUnit;
+
+/*
+ * Annotations are calculated from the perspective of the compilation unit that
+ * accesses the fields or methods. Since they are stored with that unit, they do not
+ * need to reference the dex file or method for which they have been calculated.
+ * However, we do store the dex file, declaring class index and field index of the
+ * resolved field to help distinguish between fields.
+ */
+
+class IFieldAnnotation {
+ public:
+  // For each requested instance field compute whether we can fast path the access with IGET/IPUT.
+  // If yes (at least for IGET), computes the offset and volatility.
+  static void Resolve(const DexCompilationUnit* mUnit, IFieldAnnotation* annotations, size_t count)
+      LOCKS_EXCLUDED(Locks::mutator_lock_);
+
+  // Construct an unresolved instance field annotation.
+  explicit IFieldAnnotation(uint16_t field_idx)
+      : field_idx_(field_idx),
+        fast_get_(0u),
+        fast_put_(0u),
+        is_volatile_(1u),
+        reserved_(0u),
+        field_offset_(0u),
+        declaring_dex_file_(nullptr),
+        declaring_class_idx_(0u),
+        declaring_field_idx_(0u) {
+  }
+
+  uint16_t FieldIndex() const {
+    return field_idx_;
+  }
+
+  bool FastGet() const {
+    return fast_get_ != 0u;
+  }
+
+  bool FastPut() const {
+    return fast_put_ != 0u;
+  }
+
+  bool IsVolatile() const {
+    return is_volatile_ != 0u;
+  }
+
+  MemberOffset FieldOffset() const {
+    return field_offset_;
+  }
+
+  bool IsResolved() const {
+    return declaring_dex_file_ != nullptr;
+  }
+
+  const DexFile* DeclaringDexFile() const {
+    return declaring_dex_file_;
+  }
+
+  uint16_t DeclaringClassIndex() const {
+    return declaring_class_idx_;
+  }
+
+  uint16_t DeclaringFieldIndex() const {
+    return declaring_field_idx_;
+  }
+
+ private:
+  // The field index in the compiling method's dex file.
+  uint16_t field_idx_;
+  // Can the compiling method fast-path IGET from this field?
+  uint16_t fast_get_ : 1;
+  // Can the compiling method fast-path IPUT from this field?
+  uint16_t fast_put_ : 1;
+  // Is the field volatile? Unknown if unresolved, so treated as volatile.
+  uint16_t is_volatile_ : 1;
+  // Reserved.
+  uint16_t reserved_ : 13;
+  // The member offset of the field, MemberOffset(static_cast<size_t>(-1)) if unresolved.
+  MemberOffset field_offset_;
+  // The dex file that defines the class containing the field and the field, nullptr if unresolved.
+  const DexFile* declaring_dex_file_;
+  // The type index of the class declaring the field, 0 if unresolved.
+  uint16_t declaring_class_idx_;
+  // The field index in the dex file that defines field, 0 if unresolved.
+  uint16_t declaring_field_idx_;
+};
+
+class SFieldAnnotation {
+ public:
+  // For each requested static field compute whether we can fast path the access with SGET/SPUT.
+  // If yes (at least for SGET), computes the offset and volatility, storage index, and whether
+  // the access is from the same class or the class can be assumed initialized.
+  static void Resolve(const DexCompilationUnit* mUnit, SFieldAnnotation* annotations, size_t count)
+      LOCKS_EXCLUDED(Locks::mutator_lock_);
+
+  // Construct an unresolved static field annotation.
+  explicit SFieldAnnotation(uint16_t field_idx)
+      : field_idx_(field_idx),
+        fast_get_(0u),
+        fast_put_(0u),
+        is_volatile_(1u),
+        is_referrers_class_(0u),
+        is_initialized_(0u),
+        reserved_(0u),
+        field_offset_(0u),
+        storage_index_(DexFile::kDexNoIndex),
+        declaring_dex_file_(nullptr),
+        declaring_class_idx_(0u),
+        declaring_field_idx_(0u) {
+  }
+
+  uint16_t FieldIndex() const {
+    return field_idx_;
+  }
+
+  bool FastGet() const {
+    return fast_get_ != 0u;
+  }
+
+  bool FastPut() const {
+    return fast_put_ != 0u;
+  }
+
+  bool IsVolatile() const {
+    return is_volatile_ != 0u;
+  }
+
+  bool IsReferrersClass() const {
+    return is_referrers_class_ != 0u;
+  }
+
+  bool IsInitialized() const {
+    return is_initialized_ != 0u;
+  }
+
+  MemberOffset FieldOffset() const {
+    return field_offset_;
+  }
+
+  uint32_t StorageIndex() const {
+    return storage_index_;
+  }
+
+  bool IsResolved() const {
+    return declaring_dex_file_ != nullptr;
+  }
+
+  const DexFile* DeclaringDexFile() const {
+    return declaring_dex_file_;
+  }
+
+  uint16_t DeclaringClassIndex() const {
+    return declaring_class_idx_;
+  }
+
+  uint16_t DeclaringFieldIndex() const {
+    return declaring_field_idx_;
+  }
+
+ private:
+  // The field index in the compiling method's dex file.
+  uint16_t field_idx_;
+  // Can the compiling method fast-path IGET from this field?
+  uint16_t fast_get_ : 1;
+  // Can the compiling method fast-path IPUT from this field?
+  uint16_t fast_put_ : 1;
+  // Is the field volatile? Unknown if unresolved, so treated as volatile (true).
+  uint16_t is_volatile_ : 1;
+  // Is the field in the referrer's class? false if unresolved.
+  uint16_t is_referrers_class_ : 1;
+  // Can we assume that the field's class is already initialized? false if unresolved.
+  uint16_t is_initialized_ : 1;
+  // Reserved.
+  uint16_t reserved_ : 11;
+  // The member offset of the field, static_cast<size_t>(-1) if unresolved.
+  MemberOffset field_offset_;
+  // The type index of the declaring class in the compiling method's dex file,
+  // -1 if the field is unresolved or there's no appropriate TypeId in that dex file.
+  uint32_t storage_index_;
+  // The dex file that defines the class containing the field and the field, nullptr if unresolved.
+  const DexFile* declaring_dex_file_;
+  // The type index of the class declaring the field, 0 if unresolved.
+  uint16_t declaring_class_idx_;
+  // The field index in the dex file that defines field, 0 if unresolved.
+  uint16_t declaring_field_idx_;
+};
+
+}  // namespace art
+
+#endif  // ART_COMPILER_DEX_MIR_ANNOTATIONS_H_
diff --git a/compiler/dex/mir_graph.cc b/compiler/dex/mir_graph.cc
index e4550d1..39f2d0e 100644
--- a/compiler/dex/mir_graph.cc
+++ b/compiler/dex/mir_graph.cc
@@ -86,7 +86,9 @@
       forward_branches_(0),
       compiler_temps_(arena, 6, kGrowableArrayMisc),
       num_non_special_compiler_temps_(0),
-      max_available_non_special_compiler_temps_(0) {
+      max_available_non_special_compiler_temps_(0),
+      ifield_annotations_(arena, 0u),
+      sfield_annotations_(arena, 0u) {
   try_block_addr_ = new (arena_) ArenaBitVector(arena_, 0, true /* expandable */);
   max_available_special_compiler_temps_ = std::abs(static_cast<int>(kVRegNonSpecialTempBaseReg))
       - std::abs(static_cast<int>(kVRegTempBaseReg));
diff --git a/compiler/dex/mir_graph.h b/compiler/dex/mir_graph.h
index d304db9..ea0289b 100644
--- a/compiler/dex/mir_graph.h
+++ b/compiler/dex/mir_graph.h
@@ -22,6 +22,8 @@
 #include "compiler_ir.h"
 #include "arena_bit_vector.h"
 #include "utils/growable_array.h"
+#include "invoke_type.h"
+#include "mir_annotations.h"
 
 namespace art {
 
@@ -258,6 +260,12 @@
     MIR* throw_insn;
     // Fused cmp branch condition.
     ConditionCode ccode;
+    // IGET/IPUT annotation index, points to MIRGraph::ifield_annotations_. Due to limit on the
+    // number of code points (64K) and size of IGET/IPUT insn (2), this will never exceed 32K.
+    uint32_t ifield_annotation;
+    // SGET/SPUT annotation index, points to MIRGraph::sfield_annotations_. Due to limit on the
+    // number of code points (64K) and size of SGET/SPUT insn (2), this will never exceed 32K.
+    uint32_t sfield_annotation;
   } meta;
 };
 
@@ -466,6 +474,18 @@
    */
   void DumpCFG(const char* dir_prefix, bool all_blocks, const char* suffix = nullptr);
 
+  void DoAnnotateUsedFields();
+
+  const IFieldAnnotation& GetIFieldAnnotation(MIR* mir) {
+    DCHECK_LT(mir->meta.ifield_annotation, ifield_annotations_.Size());
+    return ifield_annotations_.GetRawStorage()[mir->meta.ifield_annotation];
+  }
+
+  const SFieldAnnotation& GetSFieldAnnotation(MIR* mir) {
+    DCHECK_LT(mir->meta.sfield_annotation, sfield_annotations_.Size());
+    return sfield_annotations_.GetRawStorage()[mir->meta.sfield_annotation];
+  }
+
   void InitRegLocations();
 
   void RemapRegLocations();
@@ -917,6 +937,8 @@
   size_t num_non_special_compiler_temps_;
   size_t max_available_non_special_compiler_temps_;
   size_t max_available_special_compiler_temps_;
+  GrowableArray<IFieldAnnotation> ifield_annotations_;
+  GrowableArray<SFieldAnnotation> sfield_annotations_;
 };
 
 }  // namespace art
diff --git a/compiler/dex/pass_driver.cc b/compiler/dex/pass_driver.cc
index 4f8739a..4302fe2 100644
--- a/compiler/dex/pass_driver.cc
+++ b/compiler/dex/pass_driver.cc
@@ -91,6 +91,7 @@
    *   - This is not yet an issue: no current pass would require it.
    */
   static const Pass* const passes[] = {
+      GetPassInstance<AnnotateUsedFields>(),
       GetPassInstance<CodeLayout>(),
       GetPassInstance<SSATransformation>(),
       GetPassInstance<ConstantPropagation>(),
diff --git a/compiler/dex/quick/gen_common.cc b/compiler/dex/quick/gen_common.cc
index 0533fbf..a0a83db 100644
--- a/compiler/dex/quick/gen_common.cc
+++ b/compiler/dex/quick/gen_common.cc
@@ -381,20 +381,14 @@
   const int r_base_;
 };
 
-void Mir2Lir::GenSput(uint32_t field_idx, RegLocation rl_src, bool is_long_or_double,
+void Mir2Lir::GenSput(MIR* mir, RegLocation rl_src, bool is_long_or_double,
                       bool is_object) {
-  int field_offset;
-  int storage_index;
-  bool is_volatile;
-  bool is_referrers_class;
-  bool is_initialized;
-  bool fast_path = cu_->compiler_driver->ComputeStaticFieldInfo(
-      field_idx, mir_graph_->GetCurrentDexCompilationUnit(), true,
-      &field_offset, &storage_index, &is_referrers_class, &is_volatile, &is_initialized);
-  if (fast_path && !SLOW_FIELD_PATH) {
-    DCHECK_GE(field_offset, 0);
+  const SFieldAnnotation& annotation = mir_graph_->GetSFieldAnnotation(mir);
+  cu_->compiler_driver->ProcessedStaticField(annotation.FastPut(), annotation.IsReferrersClass());
+  if (annotation.FastPut() && !SLOW_FIELD_PATH) {
+    DCHECK_GE(annotation.FieldOffset().Int32Value(), 0);
     int r_base;
-    if (is_referrers_class) {
+    if (annotation.IsReferrersClass()) {
       // Fast path, static storage base is this method's class
       RegLocation rl_method  = LoadCurrMethod();
       r_base = AllocTemp();
@@ -407,7 +401,7 @@
       // Medium path, static storage base in a different class which requires checks that the other
       // class is initialized.
       // TODO: remove initialized check now that we are initializing classes in the compiler driver.
-      DCHECK_GE(storage_index, 0);
+      DCHECK_NE(annotation.StorageIndex(), DexFile::kDexNoIndex);
       // May do runtime call so everything to home locations.
       FlushAllRegs();
       // Using fixed register to sync with possible call to runtime support.
@@ -420,9 +414,9 @@
                    mirror::ArtMethod::DexCacheResolvedTypesOffset().Int32Value(),
                    r_base);
       LoadWordDisp(r_base, mirror::Array::DataOffset(sizeof(mirror::Object*)).Int32Value() +
-                   sizeof(int32_t*) * storage_index, r_base);
+                   sizeof(int32_t*) * annotation.StorageIndex(), r_base);
       // r_base now points at static storage (Class*) or NULL if the type is not yet resolved.
-      if (!is_initialized) {
+      if (!annotation.IsInitialized()) {
         // Check if r_base is NULL or a not yet initialized class.
 
         // The slow path is invoked if the r_base is NULL or the class pointed
@@ -437,7 +431,7 @@
 
         AddSlowPath(new (arena_) StaticFieldSlowPath(this,
                                                      unresolved_branch, uninit_branch, cont,
-                                                     storage_index, r_base));
+                                                     annotation.StorageIndex(), r_base));
 
         FreeTemp(r_tmp);
       }
@@ -449,16 +443,16 @@
     } else {
       rl_src = LoadValue(rl_src, kAnyReg);
     }
-    if (is_volatile) {
+    if (annotation.IsVolatile()) {
       GenMemBarrier(kStoreStore);
     }
     if (is_long_or_double) {
-      StoreBaseDispWide(r_base, field_offset, rl_src.low_reg,
+      StoreBaseDispWide(r_base, annotation.FieldOffset().Int32Value(), rl_src.low_reg,
                         rl_src.high_reg);
     } else {
-      StoreWordDisp(r_base, field_offset, rl_src.low_reg);
+      StoreWordDisp(r_base, annotation.FieldOffset().Int32Value(), rl_src.low_reg);
     }
-    if (is_volatile) {
+    if (annotation.IsVolatile()) {
       GenMemBarrier(kStoreLoad);
     }
     if (is_object && !mir_graph_->IsConstantNullRef(rl_src)) {
@@ -471,24 +465,18 @@
         is_long_or_double ? QUICK_ENTRYPOINT_OFFSET(pSet64Static)
                           : (is_object ? QUICK_ENTRYPOINT_OFFSET(pSetObjStatic)
                                        : QUICK_ENTRYPOINT_OFFSET(pSet32Static));
-    CallRuntimeHelperImmRegLocation(setter_offset, field_idx, rl_src, true);
+    CallRuntimeHelperImmRegLocation(setter_offset, annotation.FieldIndex(), rl_src, true);
   }
 }
 
-void Mir2Lir::GenSget(uint32_t field_idx, RegLocation rl_dest,
+void Mir2Lir::GenSget(MIR* mir, RegLocation rl_dest,
                       bool is_long_or_double, bool is_object) {
-  int field_offset;
-  int storage_index;
-  bool is_volatile;
-  bool is_referrers_class;
-  bool is_initialized;
-  bool fast_path = cu_->compiler_driver->ComputeStaticFieldInfo(
-      field_idx, mir_graph_->GetCurrentDexCompilationUnit(), false,
-      &field_offset, &storage_index, &is_referrers_class, &is_volatile, &is_initialized);
-  if (fast_path && !SLOW_FIELD_PATH) {
-    DCHECK_GE(field_offset, 0);
+  const SFieldAnnotation& annotation = mir_graph_->GetSFieldAnnotation(mir);
+  cu_->compiler_driver->ProcessedStaticField(annotation.FastGet(), annotation.IsReferrersClass());
+  if (annotation.FastGet() && !SLOW_FIELD_PATH) {
+    DCHECK_GE(annotation.FieldOffset().Int32Value(), 0);
     int r_base;
-    if (is_referrers_class) {
+    if (annotation.IsReferrersClass()) {
       // Fast path, static storage base is this method's class
       RegLocation rl_method  = LoadCurrMethod();
       r_base = AllocTemp();
@@ -497,7 +485,7 @@
     } else {
       // Medium path, static storage base in a different class which requires checks that the other
       // class is initialized
-      DCHECK_GE(storage_index, 0);
+      DCHECK_NE(annotation.StorageIndex(), DexFile::kDexNoIndex);
       // May do runtime call so everything to home locations.
       FlushAllRegs();
       // Using fixed register to sync with possible call to runtime support.
@@ -510,9 +498,9 @@
                    mirror::ArtMethod::DexCacheResolvedTypesOffset().Int32Value(),
                    r_base);
       LoadWordDisp(r_base, mirror::Array::DataOffset(sizeof(mirror::Object*)).Int32Value() +
-                   sizeof(int32_t*) * storage_index, r_base);
+                   sizeof(int32_t*) * annotation.StorageIndex(), r_base);
       // r_base now points at static storage (Class*) or NULL if the type is not yet resolved.
-      if (!is_initialized) {
+      if (!annotation.IsInitialized()) {
         // Check if r_base is NULL or a not yet initialized class.
 
         // The slow path is invoked if the r_base is NULL or the class pointed
@@ -527,7 +515,7 @@
 
         AddSlowPath(new (arena_) StaticFieldSlowPath(this,
                                                      unresolved_branch, uninit_branch, cont,
-                                                     storage_index, r_base));
+                                                     annotation.StorageIndex(), r_base));
 
         FreeTemp(r_tmp);
       }
@@ -535,14 +523,14 @@
     }
     // r_base now holds static storage base
     RegLocation rl_result = EvalLoc(rl_dest, kAnyReg, true);
-    if (is_volatile) {
+    if (annotation.IsVolatile()) {
       GenMemBarrier(kLoadLoad);
     }
     if (is_long_or_double) {
-      LoadBaseDispWide(r_base, field_offset, rl_result.low_reg,
+      LoadBaseDispWide(r_base, annotation.FieldOffset().Int32Value(), rl_result.low_reg,
                        rl_result.high_reg, INVALID_SREG);
     } else {
-      LoadWordDisp(r_base, field_offset, rl_result.low_reg);
+      LoadWordDisp(r_base, annotation.FieldOffset().Int32Value(), rl_result.low_reg);
     }
     FreeTemp(r_base);
     if (is_long_or_double) {
@@ -556,7 +544,7 @@
         is_long_or_double ? QUICK_ENTRYPOINT_OFFSET(pGet64Static)
                           :(is_object ? QUICK_ENTRYPOINT_OFFSET(pGetObjStatic)
                                       : QUICK_ENTRYPOINT_OFFSET(pGet32Static));
-    CallRuntimeHelperImm(getterOffset, field_idx, true);
+    CallRuntimeHelperImm(getterOffset, annotation.FieldIndex(), true);
     if (is_long_or_double) {
       RegLocation rl_result = GetReturnWide(rl_dest.fp);
       StoreValueWide(rl_dest, rl_result);
@@ -698,18 +686,15 @@
   }
 }
 
-void Mir2Lir::GenIGet(uint32_t field_idx, int opt_flags, OpSize size,
+void Mir2Lir::GenIGet(MIR* mir, int opt_flags, OpSize size,
                       RegLocation rl_dest, RegLocation rl_obj, bool is_long_or_double,
                       bool is_object) {
-  int field_offset;
-  bool is_volatile;
-
-  bool fast_path = FastInstance(field_idx, false, &field_offset, &is_volatile);
-
-  if (fast_path && !SLOW_FIELD_PATH) {
+  const IFieldAnnotation& annotation = mir_graph_->GetIFieldAnnotation(mir);
+  cu_->compiler_driver->ProcessedInstanceField(annotation.FastGet());
+  if (annotation.FastGet() && !SLOW_FIELD_PATH) {
     RegLocation rl_result;
     RegisterClass reg_class = oat_reg_class_by_size(size);
-    DCHECK_GE(field_offset, 0);
+    DCHECK_GE(annotation.FieldOffset().Int32Value(), 0);
     rl_obj = LoadValue(rl_obj, kCoreReg);
     if (is_long_or_double) {
       DCHECK(rl_dest.wide);
@@ -717,17 +702,17 @@
       if (cu_->instruction_set == kX86) {
         rl_result = EvalLoc(rl_dest, reg_class, true);
         GenNullCheck(rl_obj.s_reg_low, rl_obj.low_reg, opt_flags);
-        LoadBaseDispWide(rl_obj.low_reg, field_offset, rl_result.low_reg,
+        LoadBaseDispWide(rl_obj.low_reg, annotation.FieldOffset().Int32Value(), rl_result.low_reg,
                          rl_result.high_reg, rl_obj.s_reg_low);
-        if (is_volatile) {
+        if (annotation.IsVolatile()) {
           GenMemBarrier(kLoadLoad);
         }
       } else {
         int reg_ptr = AllocTemp();
-        OpRegRegImm(kOpAdd, reg_ptr, rl_obj.low_reg, field_offset);
+        OpRegRegImm(kOpAdd, reg_ptr, rl_obj.low_reg, annotation.FieldOffset().Int32Value());
         rl_result = EvalLoc(rl_dest, reg_class, true);
         LoadBaseDispWide(reg_ptr, 0, rl_result.low_reg, rl_result.high_reg, INVALID_SREG);
-        if (is_volatile) {
+        if (annotation.IsVolatile()) {
           GenMemBarrier(kLoadLoad);
         }
         FreeTemp(reg_ptr);
@@ -736,9 +721,9 @@
     } else {
       rl_result = EvalLoc(rl_dest, reg_class, true);
       GenNullCheck(rl_obj.s_reg_low, rl_obj.low_reg, opt_flags);
-      LoadBaseDisp(rl_obj.low_reg, field_offset, rl_result.low_reg,
+      LoadBaseDisp(rl_obj.low_reg, annotation.FieldOffset().Int32Value(), rl_result.low_reg,
                    kWord, rl_obj.s_reg_low);
-      if (is_volatile) {
+      if (annotation.IsVolatile()) {
         GenMemBarrier(kLoadLoad);
       }
       StoreValue(rl_dest, rl_result);
@@ -748,7 +733,7 @@
         is_long_or_double ? QUICK_ENTRYPOINT_OFFSET(pGet64Instance)
                           : (is_object ? QUICK_ENTRYPOINT_OFFSET(pGetObjInstance)
                                        : QUICK_ENTRYPOINT_OFFSET(pGet32Instance));
-    CallRuntimeHelperImmRegLocation(getterOffset, field_idx, rl_obj, true);
+    CallRuntimeHelperImmRegLocation(getterOffset, annotation.FieldIndex(), rl_obj, true);
     if (is_long_or_double) {
       RegLocation rl_result = GetReturnWide(rl_dest.fp);
       StoreValueWide(rl_dest, rl_result);
@@ -759,39 +744,37 @@
   }
 }
 
-void Mir2Lir::GenIPut(uint32_t field_idx, int opt_flags, OpSize size,
+void Mir2Lir::GenIPut(MIR* mir, int opt_flags, OpSize size,
                       RegLocation rl_src, RegLocation rl_obj, bool is_long_or_double,
                       bool is_object) {
-  int field_offset;
-  bool is_volatile;
-
-  bool fast_path = FastInstance(field_idx, true, &field_offset, &is_volatile);
-  if (fast_path && !SLOW_FIELD_PATH) {
+  const IFieldAnnotation& annotation = mir_graph_->GetIFieldAnnotation(mir);
+  cu_->compiler_driver->ProcessedInstanceField(annotation.FastPut());
+  if (annotation.FastPut() && !SLOW_FIELD_PATH) {
     RegisterClass reg_class = oat_reg_class_by_size(size);
-    DCHECK_GE(field_offset, 0);
+    DCHECK_GE(annotation.FieldOffset().Int32Value(), 0);
     rl_obj = LoadValue(rl_obj, kCoreReg);
     if (is_long_or_double) {
       int reg_ptr;
       rl_src = LoadValueWide(rl_src, kAnyReg);
       GenNullCheck(rl_obj.s_reg_low, rl_obj.low_reg, opt_flags);
       reg_ptr = AllocTemp();
-      OpRegRegImm(kOpAdd, reg_ptr, rl_obj.low_reg, field_offset);
-      if (is_volatile) {
+      OpRegRegImm(kOpAdd, reg_ptr, rl_obj.low_reg, annotation.FieldOffset().Int32Value());
+      if (annotation.IsVolatile()) {
         GenMemBarrier(kStoreStore);
       }
       StoreBaseDispWide(reg_ptr, 0, rl_src.low_reg, rl_src.high_reg);
-      if (is_volatile) {
+      if (annotation.IsVolatile()) {
         GenMemBarrier(kLoadLoad);
       }
       FreeTemp(reg_ptr);
     } else {
       rl_src = LoadValue(rl_src, reg_class);
       GenNullCheck(rl_obj.s_reg_low, rl_obj.low_reg, opt_flags);
-      if (is_volatile) {
+      if (annotation.IsVolatile()) {
         GenMemBarrier(kStoreStore);
       }
-      StoreBaseDisp(rl_obj.low_reg, field_offset, rl_src.low_reg, kWord);
-      if (is_volatile) {
+      StoreBaseDisp(rl_obj.low_reg, annotation.FieldOffset().Int32Value(), rl_src.low_reg, kWord);
+      if (annotation.IsVolatile()) {
         GenMemBarrier(kLoadLoad);
       }
       if (is_object && !mir_graph_->IsConstantNullRef(rl_src)) {
@@ -803,7 +786,8 @@
         is_long_or_double ? QUICK_ENTRYPOINT_OFFSET(pSet64Instance)
                           : (is_object ? QUICK_ENTRYPOINT_OFFSET(pSetObjInstance)
                                        : QUICK_ENTRYPOINT_OFFSET(pSet32Instance));
-    CallRuntimeHelperImmRegLocationRegLocation(setter_offset, field_idx, rl_obj, rl_src, true);
+    CallRuntimeHelperImmRegLocationRegLocation(setter_offset, annotation.FieldIndex(),
+                                               rl_obj, rl_src, true);
   }
 }
 
diff --git a/compiler/dex/quick/mir_to_lir.cc b/compiler/dex/quick/mir_to_lir.cc
index 8c2ed36..00518bd 100644
--- a/compiler/dex/quick/mir_to_lir.cc
+++ b/compiler/dex/quick/mir_to_lir.cc
@@ -596,72 +596,72 @@
       break;
 
     case Instruction::IGET_OBJECT:
-      GenIGet(vC, opt_flags, kWord, rl_dest, rl_src[0], false, true);
+      GenIGet(mir, opt_flags, kWord, rl_dest, rl_src[0], false, true);
       break;
 
     case Instruction::IGET_WIDE:
-      GenIGet(vC, opt_flags, kLong, rl_dest, rl_src[0], true, false);
+      GenIGet(mir, opt_flags, kLong, rl_dest, rl_src[0], true, false);
       break;
 
     case Instruction::IGET:
-      GenIGet(vC, opt_flags, kWord, rl_dest, rl_src[0], false, false);
+      GenIGet(mir, opt_flags, kWord, rl_dest, rl_src[0], false, false);
       break;
 
     case Instruction::IGET_CHAR:
-      GenIGet(vC, opt_flags, kUnsignedHalf, rl_dest, rl_src[0], false, false);
+      GenIGet(mir, opt_flags, kUnsignedHalf, rl_dest, rl_src[0], false, false);
       break;
 
     case Instruction::IGET_SHORT:
-      GenIGet(vC, opt_flags, kSignedHalf, rl_dest, rl_src[0], false, false);
+      GenIGet(mir, opt_flags, kSignedHalf, rl_dest, rl_src[0], false, false);
       break;
 
     case Instruction::IGET_BOOLEAN:
     case Instruction::IGET_BYTE:
-      GenIGet(vC, opt_flags, kUnsignedByte, rl_dest, rl_src[0], false, false);
+      GenIGet(mir, opt_flags, kUnsignedByte, rl_dest, rl_src[0], false, false);
       break;
 
     case Instruction::IPUT_WIDE:
-      GenIPut(vC, opt_flags, kLong, rl_src[0], rl_src[1], true, false);
+      GenIPut(mir, opt_flags, kLong, rl_src[0], rl_src[1], true, false);
       break;
 
     case Instruction::IPUT_OBJECT:
-      GenIPut(vC, opt_flags, kWord, rl_src[0], rl_src[1], false, true);
+      GenIPut(mir, opt_flags, kWord, rl_src[0], rl_src[1], false, true);
       break;
 
     case Instruction::IPUT:
-      GenIPut(vC, opt_flags, kWord, rl_src[0], rl_src[1], false, false);
+      GenIPut(mir, opt_flags, kWord, rl_src[0], rl_src[1], false, false);
       break;
 
     case Instruction::IPUT_BOOLEAN:
     case Instruction::IPUT_BYTE:
-      GenIPut(vC, opt_flags, kUnsignedByte, rl_src[0], rl_src[1], false, false);
+      GenIPut(mir, opt_flags, kUnsignedByte, rl_src[0], rl_src[1], false, false);
       break;
 
     case Instruction::IPUT_CHAR:
-      GenIPut(vC, opt_flags, kUnsignedHalf, rl_src[0], rl_src[1], false, false);
+      GenIPut(mir, opt_flags, kUnsignedHalf, rl_src[0], rl_src[1], false, false);
       break;
 
     case Instruction::IPUT_SHORT:
-      GenIPut(vC, opt_flags, kSignedHalf, rl_src[0], rl_src[1], false, false);
+      GenIPut(mir, opt_flags, kSignedHalf, rl_src[0], rl_src[1], false, false);
       break;
 
     case Instruction::SGET_OBJECT:
-      GenSget(vB, rl_dest, false, true);
+      GenSget(mir, rl_dest, false, true);
       break;
     case Instruction::SGET:
     case Instruction::SGET_BOOLEAN:
     case Instruction::SGET_BYTE:
     case Instruction::SGET_CHAR:
     case Instruction::SGET_SHORT:
-      GenSget(vB, rl_dest, false, false);
+      GenSget(mir, rl_dest, false, false);
       break;
 
     case Instruction::SGET_WIDE:
-      GenSget(vB, rl_dest, true, false);
+      GenSget(mir, rl_dest, true, false);
       break;
 
     case Instruction::SPUT_OBJECT:
-      GenSput(vB, rl_src[0], false, true);
+      GenSput(mir, rl_src[0], false, true);
       break;
 
     case Instruction::SPUT:
@@ -669,11 +669,11 @@
     case Instruction::SPUT_BYTE:
     case Instruction::SPUT_CHAR:
     case Instruction::SPUT_SHORT:
-      GenSput(vB, rl_src[0], false, false);
+      GenSput(mir, rl_src[0], false, false);
       break;
 
     case Instruction::SPUT_WIDE:
-      GenSput(vB, rl_src[0], true, false);
+      GenSput(mir, rl_src[0], true, false);
       break;
 
     case Instruction::INVOKE_STATIC_RANGE:
diff --git a/compiler/dex/quick/mir_to_lir.h b/compiler/dex/quick/mir_to_lir.h
index c60c394..c36013f 100644
--- a/compiler/dex/quick/mir_to_lir.h
+++ b/compiler/dex/quick/mir_to_lir.h
@@ -558,13 +558,13 @@
     void GenNewArray(uint32_t type_idx, RegLocation rl_dest,
                      RegLocation rl_src);
     void GenFilledNewArray(CallInfo* info);
-    void GenSput(uint32_t field_idx, RegLocation rl_src,
+    void GenSput(MIR* mir, RegLocation rl_src,
                  bool is_long_or_double, bool is_object);
-    void GenSget(uint32_t field_idx, RegLocation rl_dest,
+    void GenSget(MIR* mir, RegLocation rl_dest,
                  bool is_long_or_double, bool is_object);
-    void GenIGet(uint32_t field_idx, int opt_flags, OpSize size,
+    void GenIGet(MIR* mir, int opt_flags, OpSize size,
                  RegLocation rl_dest, RegLocation rl_obj, bool is_long_or_double, bool is_object);
-    void GenIPut(uint32_t field_idx, int opt_flags, OpSize size,
+    void GenIPut(MIR* mir, int opt_flags, OpSize size,
                  RegLocation rl_src, RegLocation rl_obj, bool is_long_or_double, bool is_object);
     void GenArrayObjPut(int opt_flags, RegLocation rl_array, RegLocation rl_index,
                         RegLocation rl_src);
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index 5adb792..c7bf952 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -881,6 +881,24 @@
   }
 }
 
+void CompilerDriver::ProcessedInstanceField(bool resolved) {
+  if (!resolved) {
+    stats_->UnresolvedInstanceField();
+  } else {
+    stats_->ResolvedInstanceField();
+  }
+}
+
+void CompilerDriver::ProcessedStaticField(bool resolved, bool local) {
+  if (!resolved) {
+    stats_->UnresolvedStaticField();
+  } else if (local) {
+    stats_->ResolvedLocalStaticField();
+  } else {
+    stats_->ResolvedStaticField();
+  }
+}
+
 static mirror::Class* ComputeCompilingMethodsClass(ScopedObjectAccess& soa,
                                                    SirtRef<mirror::DexCache>& dex_cache,
                                                    const DexCompilationUnit* mUnit)
diff --git a/compiler/driver/compiler_driver.h b/compiler/driver/compiler_driver.h
index 092fe52..5c5382b 100644
--- a/compiler/driver/compiler_driver.h
+++ b/compiler/driver/compiler_driver.h
@@ -197,6 +197,9 @@
                           bool* is_type_initialized, bool* use_direct_type_ptr,
                           uintptr_t* direct_type_ptr);
 
+  void ProcessedInstanceField(bool resolved);
+  void ProcessedStaticField(bool resolved, bool local);
+
   // Can we fast path instance field access in a verified accessor?
   // If yes, computes field's offset and volatility and whether the method is static or not.
   static bool ComputeSpecialAccessorInfo(uint32_t field_idx, bool is_put,