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diff --git a/clang-tools-extra/clang-tidy/performance/ImplicitCastInLoopCheck.h b/clang-tools-extra/clang-tidy/performance/ImplicitCastInLoopCheck.h
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index 00000000000..5131cf405b1
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+++ b/clang-tools-extra/clang-tidy/performance/ImplicitCastInLoopCheck.h
@@ -0,0 +1,37 @@
+//===--- ImplicitCastInLoopCheck.h - clang-tidy------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_IMPLICIT_CAST_IN_LOOP_CHECK_H_
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_IMPLICIT_CAST_IN_LOOP_CHECK_H_
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+namespace performance {
+
+// Checks that in a for range loop, if the provided type is a reference, then
+// the underlying type is the one returned by the iterator (i.e. that there
+// isn't any implicit conversion).
+class ImplicitCastInLoopCheck : public ClangTidyCheck {
+ public:
+  using ClangTidyCheck::ClangTidyCheck;
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+
+ private:
+  void ReportAndFix(const ASTContext *Context, const VarDecl *VD,
+                    const CXXOperatorCallExpr *OperatorCall);
+};
+
+} // namespace performance
+} // namespace tidy
+} // namespace clang
+
+#endif  // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_IMPLICIT_CAST_IN_LOOP_CHECK_H_