diff --git a/src/google/protobuf/compiler/cpp/cpp_string_field.cc b/src/google/protobuf/compiler/cpp/cpp_string_field.cc
index 9c4a117b6d..664a277946 100644
--- a/src/google/protobuf/compiler/cpp/cpp_string_field.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_string_field.cc
@@ -969,7 +969,7 @@ GenerateMergeFromCodedStream(io::Printer* printer) const {
 void RepeatedStringFieldGenerator::
 GenerateSerializeWithCachedSizes(io::Printer* printer) const {
   printer->Print(variables_,
-    "for (int i = 0; i < this->$name$_size(); i++) {\n");
+    "for (int i = 0, n = this->$name$_size(); i < n; i++) {\n");
   printer->Indent();
   if (descriptor_->type() == FieldDescriptor::TYPE_STRING) {
     GenerateUtf8CheckCodeForString(
@@ -986,7 +986,7 @@ GenerateSerializeWithCachedSizes(io::Printer* printer) const {
 void RepeatedStringFieldGenerator::
 GenerateSerializeWithCachedSizesToArray(io::Printer* printer) const {
   printer->Print(variables_,
-    "for (int i = 0; i < this->$name$_size(); i++) {\n");
+    "for (int i = 0, n = this->$name$_size(); i < n; i++) {\n");
   printer->Indent();
   if (descriptor_->type() == FieldDescriptor::TYPE_STRING) {
     GenerateUtf8CheckCodeForString(
@@ -1005,7 +1005,7 @@ GenerateByteSize(io::Printer* printer) const {
   printer->Print(variables_,
     "total_size += $tag_size$ *\n"
     "    ::google::protobuf::internal::FromIntSize(this->$name$_size());\n"
-    "for (int i = 0; i < this->$name$_size(); i++) {\n"
+    "for (int i = 0, n = this->$name$_size(); i < n; i++) {\n"
     "  total_size += ::google::protobuf::internal::WireFormatLite::$declared_type$Size(\n"
     "    this->$name$(i));\n"
     "}\n");
diff --git a/src/google/protobuf/compiler/plugin.pb.cc b/src/google/protobuf/compiler/plugin.pb.cc
index f806392a39..686ee477a6 100644
--- a/src/google/protobuf/compiler/plugin.pb.cc
+++ b/src/google/protobuf/compiler/plugin.pb.cc
@@ -887,7 +887,7 @@ void CodeGeneratorRequest::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.compiler.CodeGeneratorRequest)
   // repeated string file_to_generate = 1;
-  for (int i = 0; i < this->file_to_generate_size(); i++) {
+  for (int i = 0, n = this->file_to_generate_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
       this->file_to_generate(i).data(), this->file_to_generate(i).length(),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
@@ -930,7 +930,7 @@ void CodeGeneratorRequest::SerializeWithCachedSizes(
   (void)deterministic;  // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.compiler.CodeGeneratorRequest)
   // repeated string file_to_generate = 1;
-  for (int i = 0; i < this->file_to_generate_size(); i++) {
+  for (int i = 0, n = this->file_to_generate_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
       this->file_to_generate(i).data(), this->file_to_generate(i).length(),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
@@ -984,7 +984,7 @@ size_t CodeGeneratorRequest::ByteSizeLong() const {
   // repeated string file_to_generate = 1;
   total_size += 1 *
       ::google::protobuf::internal::FromIntSize(this->file_to_generate_size());
-  for (int i = 0; i < this->file_to_generate_size(); i++) {
+  for (int i = 0, n = this->file_to_generate_size(); i < n; i++) {
     total_size += ::google::protobuf::internal::WireFormatLite::StringSize(
       this->file_to_generate(i));
   }
diff --git a/src/google/protobuf/descriptor.pb.cc b/src/google/protobuf/descriptor.pb.cc
index 59777b1189..15c97d0b96 100644
--- a/src/google/protobuf/descriptor.pb.cc
+++ b/src/google/protobuf/descriptor.pb.cc
@@ -1576,7 +1576,7 @@ void FileDescriptorProto::SerializeWithCachedSizes(
   }
 
   // repeated string dependency = 3;
-  for (int i = 0; i < this->dependency_size(); i++) {
+  for (int i = 0, n = this->dependency_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
       this->dependency(i).data(), this->dependency(i).length(),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
@@ -1677,7 +1677,7 @@ void FileDescriptorProto::SerializeWithCachedSizes(
   }
 
   // repeated string dependency = 3;
-  for (int i = 0; i < this->dependency_size(); i++) {
+  for (int i = 0, n = this->dependency_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
       this->dependency(i).data(), this->dependency(i).length(),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
@@ -1771,7 +1771,7 @@ size_t FileDescriptorProto::ByteSizeLong() const {
   // repeated string dependency = 3;
   total_size += 1 *
       ::google::protobuf::internal::FromIntSize(this->dependency_size());
-  for (int i = 0; i < this->dependency_size(); i++) {
+  for (int i = 0, n = this->dependency_size(); i < n; i++) {
     total_size += ::google::protobuf::internal::WireFormatLite::StringSize(
       this->dependency(i));
   }
@@ -3511,7 +3511,7 @@ void DescriptorProto::SerializeWithCachedSizes(
   }
 
   // repeated string reserved_name = 10;
-  for (int i = 0; i < this->reserved_name_size(); i++) {
+  for (int i = 0, n = this->reserved_name_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
       this->reserved_name(i).data(), this->reserved_name(i).length(),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
@@ -3599,7 +3599,7 @@ void DescriptorProto::SerializeWithCachedSizes(
   }
 
   // repeated string reserved_name = 10;
-  for (int i = 0; i < this->reserved_name_size(); i++) {
+  for (int i = 0, n = this->reserved_name_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
       this->reserved_name(i).data(), this->reserved_name(i).length(),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
@@ -3705,7 +3705,7 @@ size_t DescriptorProto::ByteSizeLong() const {
   // repeated string reserved_name = 10;
   total_size += 1 *
       ::google::protobuf::internal::FromIntSize(this->reserved_name_size());
-  for (int i = 0; i < this->reserved_name_size(); i++) {
+  for (int i = 0, n = this->reserved_name_size(); i < n; i++) {
     total_size += ::google::protobuf::internal::WireFormatLite::StringSize(
       this->reserved_name(i));
   }
@@ -14137,7 +14137,7 @@ void SourceCodeInfo_Location::SerializeWithCachedSizes(
   }
 
   // repeated string leading_detached_comments = 6;
-  for (int i = 0; i < this->leading_detached_comments_size(); i++) {
+  for (int i = 0, n = this->leading_detached_comments_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
       this->leading_detached_comments(i).data(), this->leading_detached_comments(i).length(),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
@@ -14208,7 +14208,7 @@ void SourceCodeInfo_Location::SerializeWithCachedSizes(
   }
 
   // repeated string leading_detached_comments = 6;
-  for (int i = 0; i < this->leading_detached_comments_size(); i++) {
+  for (int i = 0, n = this->leading_detached_comments_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
       this->leading_detached_comments(i).data(), this->leading_detached_comments(i).length(),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
@@ -14267,7 +14267,7 @@ size_t SourceCodeInfo_Location::ByteSizeLong() const {
   // repeated string leading_detached_comments = 6;
   total_size += 1 *
       ::google::protobuf::internal::FromIntSize(this->leading_detached_comments_size());
-  for (int i = 0; i < this->leading_detached_comments_size(); i++) {
+  for (int i = 0, n = this->leading_detached_comments_size(); i < n; i++) {
     total_size += ::google::protobuf::internal::WireFormatLite::StringSize(
       this->leading_detached_comments(i));
   }
diff --git a/src/google/protobuf/field_mask.pb.cc b/src/google/protobuf/field_mask.pb.cc
index dc639e4263..c9409fe537 100644
--- a/src/google/protobuf/field_mask.pb.cc
+++ b/src/google/protobuf/field_mask.pb.cc
@@ -232,7 +232,7 @@ void FieldMask::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.FieldMask)
   // repeated string paths = 1;
-  for (int i = 0; i < this->paths_size(); i++) {
+  for (int i = 0, n = this->paths_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
       this->paths(i).data(), this->paths(i).length(),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
@@ -249,7 +249,7 @@ void FieldMask::SerializeWithCachedSizes(
   (void)deterministic;  // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.FieldMask)
   // repeated string paths = 1;
-  for (int i = 0; i < this->paths_size(); i++) {
+  for (int i = 0, n = this->paths_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
       this->paths(i).data(), this->paths(i).length(),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
@@ -269,7 +269,7 @@ size_t FieldMask::ByteSizeLong() const {
   // repeated string paths = 1;
   total_size += 1 *
       ::google::protobuf::internal::FromIntSize(this->paths_size());
-  for (int i = 0; i < this->paths_size(); i++) {
+  for (int i = 0, n = this->paths_size(); i < n; i++) {
     total_size += ::google::protobuf::internal::WireFormatLite::StringSize(
       this->paths(i));
   }
diff --git a/src/google/protobuf/type.pb.cc b/src/google/protobuf/type.pb.cc
index 1eb23ff565..8bf57ecf12 100644
--- a/src/google/protobuf/type.pb.cc
+++ b/src/google/protobuf/type.pb.cc
@@ -613,7 +613,7 @@ void Type::SerializeWithCachedSizes(
   }
 
   // repeated string oneofs = 3;
-  for (int i = 0; i < this->oneofs_size(); i++) {
+  for (int i = 0, n = this->oneofs_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
       this->oneofs(i).data(), this->oneofs(i).length(),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
@@ -666,7 +666,7 @@ void Type::SerializeWithCachedSizes(
   }
 
   // repeated string oneofs = 3;
-  for (int i = 0; i < this->oneofs_size(); i++) {
+  for (int i = 0, n = this->oneofs_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
       this->oneofs(i).data(), this->oneofs(i).length(),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
@@ -717,7 +717,7 @@ size_t Type::ByteSizeLong() const {
   // repeated string oneofs = 3;
   total_size += 1 *
       ::google::protobuf::internal::FromIntSize(this->oneofs_size());
-  for (int i = 0; i < this->oneofs_size(); i++) {
+  for (int i = 0, n = this->oneofs_size(); i < n; i++) {
     total_size += ::google::protobuf::internal::WireFormatLite::StringSize(
       this->oneofs(i));
   }