================
@@ -0,0 +1,56 @@
+//===- AVRTargetTransformInfo.h - AVR specific TTI ---------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+/// \file
+/// This file defines a TargetTransformInfoImplBase conforming object specific
+/// to the AVR target machine. It uses the target's detailed information to
+/// provide more precise answers to certain TTI queries, while letting the
+/// target independent and default TTI implementations handle the rest.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_AVR_AVRTARGETTRANSFORMINFO_H
+#define LLVM_LIB_TARGET_AVR_AVRTARGETTRANSFORMINFO_H
+
+#include "AVRSubtarget.h"
+#include "AVRTargetMachine.h"
+#include "llvm/Analysis/TargetTransformInfo.h"
+#include "llvm/CodeGen/BasicTTIImpl.h"
+#include "llvm/IR/Function.h"
+#include <optional>
+
+namespace llvm {
----------------
benshi001 wrote:

New tests are needed to show what this `TTI` can optimize.

https://github.com/llvm/llvm-project/pull/152028
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