llvm/llvm/include/llvm/CodeGen/SelectionDAGAddressAnalysis.h

//===- SelectionDAGAddressAnalysis.h - DAG Address Analysis -----*- 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
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_SELECTIONDAGADDRESSANALYSIS_H
#define LLVM_CODEGEN_SELECTIONDAGADDRESSANALYSIS_H

#include "llvm/Analysis/MemoryLocation.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include <cstdint>

namespace llvm {

class SelectionDAG;

/// Helper struct to parse and store a memory address as base + index + offset.
/// We ignore sign extensions when it is safe to do so.
/// The following two expressions are not equivalent. To differentiate we need
/// to store whether there was a sign extension involved in the index
/// computation.
///  (load (i64 add (i64 copyfromreg %c)
///                 (i64 signextend (add (i8 load %index)
///                                      (i8 1))))
/// vs
///
/// (load (i64 add (i64 copyfromreg %c)
///                (i64 signextend (i32 add (i32 signextend (i8 load %index))
///                                         (i32 1)))))
class BaseIndexOffset { … };

} // end namespace llvm

#endif // LLVM_CODEGEN_SELECTIONDAGADDRESSANALYSIS_H