diff --git a/compiler/utils/arm/jni_macro_assembler_arm_vixl.cc b/compiler/utils/arm/jni_macro_assembler_arm_vixl.cc
index 2c428fa..c6c764e 100644
--- a/compiler/utils/arm/jni_macro_assembler_arm_vixl.cc
+++ b/compiler/utils/arm/jni_macro_assembler_arm_vixl.cc
@@ -120,11 +120,10 @@
 
   // Write out entry spills.
   int32_t offset = frame_size + kFramePointerSize;
-  for (size_t i = 0; i < entry_spills.size(); ++i) {
-    ArmManagedRegister reg = entry_spills.at(i).AsArm();
+  for (const ManagedRegisterSpill& spill : entry_spills) {
+    ArmManagedRegister reg = spill.AsArm();
     if (reg.IsNoRegister()) {
       // only increment stack offset.
-      ManagedRegisterSpill spill = entry_spills.at(i);
       offset += spill.getSize();
     } else if (reg.IsCoreRegister()) {
       asm_.StoreToOffset(kStoreWord, AsVIXLRegister(reg), sp, offset);
diff --git a/compiler/utils/arm64/jni_macro_assembler_arm64.cc b/compiler/utils/arm64/jni_macro_assembler_arm64.cc
index a5aa1c1..d6ce033 100644
--- a/compiler/utils/arm64/jni_macro_assembler_arm64.cc
+++ b/compiler/utils/arm64/jni_macro_assembler_arm64.cc
@@ -719,11 +719,10 @@
 
   // Write out entry spills
   int32_t offset = frame_size + static_cast<size_t>(kArm64PointerSize);
-  for (size_t i = 0; i < entry_spills.size(); ++i) {
-    Arm64ManagedRegister reg = entry_spills.at(i).AsArm64();
+  for (const ManagedRegisterSpill& spill : entry_spills) {
+    Arm64ManagedRegister reg = spill.AsArm64();
     if (reg.IsNoRegister()) {
       // only increment stack offset.
-      ManagedRegisterSpill spill = entry_spills.at(i);
       offset += spill.getSize();
     } else if (reg.IsXRegister()) {
       StoreToOffset(reg.AsXRegister(), SP, offset);
diff --git a/compiler/utils/managed_register.h b/compiler/utils/managed_register.h
index 2b7b2aa..db9c36c 100644
--- a/compiler/utils/managed_register.h
+++ b/compiler/utils/managed_register.h
@@ -101,11 +101,11 @@
   ManagedRegisterSpill(const ManagedRegister& other, int32_t size)
       : ManagedRegister(other), size_(size), spill_offset_(-1) { }
 
-  int32_t getSpillOffset() {
+  int32_t getSpillOffset() const {
     return spill_offset_;
   }
 
-  int32_t getSize() {
+  int32_t getSize() const {
     return size_;
   }
 
diff --git a/compiler/utils/mips/assembler_mips.cc b/compiler/utils/mips/assembler_mips.cc
index dce5b95..c0b6f98 100644
--- a/compiler/utils/mips/assembler_mips.cc
+++ b/compiler/utils/mips/assembler_mips.cc
@@ -4801,10 +4801,9 @@
 
   // Write out entry spills.
   int32_t offset = frame_size + kFramePointerSize;
-  for (size_t i = 0; i < entry_spills.size(); ++i) {
-    MipsManagedRegister reg = entry_spills.at(i).AsMips();
+  for (const ManagedRegisterSpill& spill : entry_spills) {
+    MipsManagedRegister reg = spill.AsMips();
     if (reg.IsNoRegister()) {
-      ManagedRegisterSpill spill = entry_spills.at(i);
       offset += spill.getSize();
     } else if (reg.IsCoreRegister()) {
       StoreToOffset(kStoreWord, reg.AsCoreRegister(), SP, offset);
diff --git a/compiler/utils/mips64/assembler_mips64.cc b/compiler/utils/mips64/assembler_mips64.cc
index bb1bb82..5b1c5d9 100644
--- a/compiler/utils/mips64/assembler_mips64.cc
+++ b/compiler/utils/mips64/assembler_mips64.cc
@@ -3633,9 +3633,8 @@
 
   // Write out entry spills.
   int32_t offset = frame_size + kFramePointerSize;
-  for (size_t i = 0; i < entry_spills.size(); ++i) {
-    Mips64ManagedRegister reg = entry_spills[i].AsMips64();
-    ManagedRegisterSpill spill = entry_spills.at(i);
+  for (const ManagedRegisterSpill& spill : entry_spills) {
+    Mips64ManagedRegister reg = spill.AsMips64();
     int32_t size = spill.getSize();
     if (reg.IsNoRegister()) {
       // only increment stack offset.
diff --git a/compiler/utils/x86/jni_macro_assembler_x86.cc b/compiler/utils/x86/jni_macro_assembler_x86.cc
index 7e29c4a..dd99f03 100644
--- a/compiler/utils/x86/jni_macro_assembler_x86.cc
+++ b/compiler/utils/x86/jni_macro_assembler_x86.cc
@@ -67,8 +67,7 @@
   cfi().AdjustCFAOffset(kFramePointerSize);
   DCHECK_EQ(static_cast<size_t>(cfi().GetCurrentCFAOffset()), frame_size);
 
-  for (size_t i = 0; i < entry_spills.size(); ++i) {
-    ManagedRegisterSpill spill = entry_spills.at(i);
+  for (const ManagedRegisterSpill& spill : entry_spills) {
     if (spill.AsX86().IsCpuRegister()) {
       int offset = frame_size + spill.getSpillOffset();
       __ movl(Address(ESP, offset), spill.AsX86().AsCpuRegister());
diff --git a/compiler/utils/x86_64/jni_macro_assembler_x86_64.cc b/compiler/utils/x86_64/jni_macro_assembler_x86_64.cc
index 9486cb4..f6b2f9d 100644
--- a/compiler/utils/x86_64/jni_macro_assembler_x86_64.cc
+++ b/compiler/utils/x86_64/jni_macro_assembler_x86_64.cc
@@ -75,8 +75,7 @@
 
   __ movq(Address(CpuRegister(RSP), 0), method_reg.AsX86_64().AsCpuRegister());
 
-  for (size_t i = 0; i < entry_spills.size(); ++i) {
-    ManagedRegisterSpill spill = entry_spills.at(i);
+  for (const ManagedRegisterSpill& spill : entry_spills) {
     if (spill.AsX86_64().IsCpuRegister()) {
       if (spill.getSize() == 8) {
         __ movq(Address(CpuRegister(RSP), frame_size + spill.getSpillOffset()),
diff --git a/dexdump/dexdump_cfg.cc b/dexdump/dexdump_cfg.cc
index 69ee068..7e534ed 100644
--- a/dexdump/dexdump_cfg.cc
+++ b/dexdump/dexdump_cfg.cc
@@ -120,7 +120,7 @@
           os << inst_str.substr(cur_start, next_escape - cur_start);
           // Escape all necessary characters.
           while (next_escape < inst_str.size()) {
-            char c = inst_str.at(next_escape);
+            char c = inst_str[next_escape];
             if (c == '"' || c == '{' || c == '}' || c == '<' || c == '>') {
               os << '\\' << c;
             } else {
diff --git a/dexlayout/dex_visualize.cc b/dexlayout/dex_visualize.cc
index abcaffc..4a36744 100644
--- a/dexlayout/dex_visualize.cc
+++ b/dexlayout/dex_visualize.cc
@@ -305,7 +305,7 @@
                                          const std::vector<dex_ir::DexFileSection>& sorted_sections,
                                          size_t section_index) {
   for (size_t i = section_index + 1; i < sorted_sections.size(); ++i) {
-    const dex_ir::DexFileSection& section = sorted_sections.at(i);
+    const dex_ir::DexFileSection& section = sorted_sections[i];
     if (section.size != 0) {
       return section.offset;
     }
diff --git a/dexlayout/dexdiag.cc b/dexlayout/dexdiag.cc
index aa4e6d0..493a8a2 100644
--- a/dexlayout/dexdiag.cc
+++ b/dexlayout/dexdiag.cc
@@ -90,7 +90,9 @@
     map_[type]++;
   }
   size_t Get(uint16_t type) const {
-    return map_.at(type);
+    auto it = map_.find(type);
+    DCHECK(it != map_.end());
+    return it->second;
   }
  private:
   std::map<uint16_t, size_t> map_;
diff --git a/patchoat/patchoat.cc b/patchoat/patchoat.cc
index 0beca1f..97b315e 100644
--- a/patchoat/patchoat.cc
+++ b/patchoat/patchoat.cc
@@ -539,7 +539,7 @@
 
     space_to_memmap_map.emplace(space, std::move(image));
     PatchOat p = PatchOat(isa,
-                          space_to_memmap_map.at(space).get(),
+                          space_to_memmap_map[space].get(),
                           space->GetLiveBitmap(),
                           space->GetMemMap(),
                           delta,
diff --git a/runtime/entrypoints/entrypoint_utils.cc b/runtime/entrypoints/entrypoint_utils.cc
index e71d1fa..d902455 100644
--- a/runtime/entrypoints/entrypoint_utils.cc
+++ b/runtime/entrypoints/entrypoint_utils.cc
@@ -74,11 +74,11 @@
     }
     for (size_t i = 0; i < args.size(); ++i) {
       if (shorty[i + 1] == 'L') {
-        jobject val = args.at(i).l;
+        jobject val = args[i].l;
         soa.Env()->SetObjectArrayElement(args_jobj, i, val);
       } else {
         JValue jv;
-        jv.SetJ(args.at(i).j);
+        jv.SetJ(args[i].j);
         mirror::Object* val = BoxPrimitive(Primitive::GetType(shorty[i + 1]), jv).Ptr();
         if (val == nullptr) {
           CHECK(soa.Self()->IsExceptionPending());
diff --git a/runtime/instrumentation.cc b/runtime/instrumentation.cc
index d752805..e5cdef7 100644
--- a/runtime/instrumentation.cc
+++ b/runtime/instrumentation.cc
@@ -252,7 +252,7 @@
 
         if (m->IsRuntimeMethod()) {
           const InstrumentationStackFrame& frame =
-              instrumentation_stack_->at(instrumentation_stack_depth_);
+              (*instrumentation_stack_)[instrumentation_stack_depth_];
           if (frame.interpreter_entry_) {
             // This instrumentation frame is for an interpreter bridge and is
             // pushed when executing the instrumented interpreter bridge. So method
@@ -271,7 +271,7 @@
         reached_existing_instrumentation_frames_ = true;
 
         const InstrumentationStackFrame& frame =
-            instrumentation_stack_->at(instrumentation_stack_depth_);
+            (*instrumentation_stack_)[instrumentation_stack_depth_];
         CHECK_EQ(m, frame.method_) << "Expected " << ArtMethod::PrettyMethod(m)
                                    << ", Found " << ArtMethod::PrettyMethod(frame.method_);
         return_pc = frame.return_pc_;
diff --git a/runtime/oat_file.cc b/runtime/oat_file.cc
index 8842942..58e16ed 100644
--- a/runtime/oat_file.cc
+++ b/runtime/oat_file.cc
@@ -686,7 +686,7 @@
           return false;
         }
       }
-      dex_file_pointer = uncompressed_dex_files_.get()->at(i)->Begin();
+      dex_file_pointer = (*uncompressed_dex_files_)[i]->Begin();
     } else {
       // Do not support mixed-mode oat files.
       if (uncompressed_dex_files_ != nullptr) {
diff --git a/runtime/quick_exception_handler.cc b/runtime/quick_exception_handler.cc
index 8b99b9f..2dbde6f 100644
--- a/runtime/quick_exception_handler.cc
+++ b/runtime/quick_exception_handler.cc
@@ -472,7 +472,7 @@
   }
 
   static VRegKind GetVRegKind(uint16_t reg, const std::vector<int32_t>& kinds) {
-    return static_cast<VRegKind>(kinds.at(reg * 2));
+    return static_cast<VRegKind>(kinds[reg * 2]);
   }
 
   QuickExceptionHandler* const exception_handler_;
diff --git a/runtime/stack.cc b/runtime/stack.cc
index a181bfe..2fb8c41 100644
--- a/runtime/stack.cc
+++ b/runtime/stack.cc
@@ -856,7 +856,7 @@
           if (reinterpret_cast<uintptr_t>(GetQuickInstrumentationExitPc()) == return_pc) {
             CHECK_LT(instrumentation_stack_depth, thread_->GetInstrumentationStack()->size());
             const instrumentation::InstrumentationStackFrame& instrumentation_frame =
-                thread_->GetInstrumentationStack()->at(instrumentation_stack_depth);
+                (*thread_->GetInstrumentationStack())[instrumentation_stack_depth];
             instrumentation_stack_depth++;
             if (GetMethod() ==
                 Runtime::Current()->GetCalleeSaveMethod(CalleeSaveType::kSaveAllCalleeSaves)) {
diff --git a/tools/veridex/flow_analysis.cc b/tools/veridex/flow_analysis.cc
index 154c60f..d4f7e5f 100644
--- a/tools/veridex/flow_analysis.cc
+++ b/tools/veridex/flow_analysis.cc
@@ -739,14 +739,15 @@
   MethodReference method(&resolver_->GetDexFile(), id);
   // TODO: doesn't work for multidex
   // TODO: doesn't work for overriding (but maybe should be done at a higher level);
-  if (accesses_.find(method) == accesses_.end()) {
+  auto method_accesses_it = accesses_.find(method);
+  if (method_accesses_it == accesses_.end()) {
     return GetReturnType(id);
   }
   uint32_t args[5];
   if (!is_range) {
     instruction.GetVarArgs(args);
   }
-  for (const ReflectAccessInfo& info : accesses_.at(method)) {
+  for (const ReflectAccessInfo& info : method_accesses_it->second) {
     if (info.cls.IsParameter() || info.name.IsParameter()) {
       RegisterValue cls = info.cls.IsParameter()
           ? GetRegister(GetParameterAt(instruction, is_range, args, info.cls.GetParameterIndex()))
diff --git a/tools/wrapagentproperties/wrapagentproperties.cc b/tools/wrapagentproperties/wrapagentproperties.cc
index 77e19e6..39cb20a 100644
--- a/tools/wrapagentproperties/wrapagentproperties.cc
+++ b/tools/wrapagentproperties/wrapagentproperties.cc
@@ -139,9 +139,10 @@
   static jvmtiError WrapGetSystemProperty(jvmtiEnv* env, const char* prop, char** out) {
     ExtraJvmtiInterface* funcs = reinterpret_cast<ExtraJvmtiInterface*>(
         const_cast<jvmtiInterface_1_*>(env->functions));
-    if (funcs->proxy_vm->map->find(prop) != funcs->proxy_vm->map->end()) {
+    auto it = funcs->proxy_vm->map->find(prop);
+    if (it != funcs->proxy_vm->map->end()) {
+      const std::string& val = it->second;
       std::string str_prop(prop);
-      const std::string& val = funcs->proxy_vm->map->at(str_prop);
       jvmtiError res = env->Allocate(val.size() + 1, reinterpret_cast<unsigned char**>(out));
       if (res != JVMTI_ERROR_NONE) {
         return res;
@@ -198,8 +199,9 @@
     if (res != JVMTI_ERROR_NONE) {
       return res;
     }
-    if (funcs->proxy_vm->map->find(prop) != funcs->proxy_vm->map->end()) {
-      funcs->proxy_vm->map->at(prop) = val;
+    auto it = funcs->proxy_vm->map->find(prop);
+    if (it != funcs->proxy_vm->map->end()) {
+      it->second = val;
     }
     return JVMTI_ERROR_NONE;
   }