llvm/llvm/include/llvm/CodeGen/GlobalISel/LoadStoreOpt.h

//== llvm/CodeGen/GlobalISel/LoadStoreOpt.h - LoadStoreOpt -------*- 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
//
//===----------------------------------------------------------------------===//
//
/// This is an optimization pass for GlobalISel generic memory operations.
/// Specifically, it focuses on merging stores and loads to consecutive
/// addresses.
//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_GLOBALISEL_LOADSTOREOPT_H
#define LLVM_CODEGEN_GLOBALISEL_LOADSTOREOPT_H

#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"

namespace llvm {
// Forward declarations.
class AnalysisUsage;
class GStore;
class LegalizerInfo;
class MachineBasicBlock;
class MachineInstr;
class TargetLowering;
struct LegalityQuery;
class MachineRegisterInfo;
namespace GISelAddressing {
/// Helper struct to store a base, index and offset that forms an address
class BaseIndexOffset { … };

/// Returns a BaseIndexOffset which describes the pointer in \p Ptr.
BaseIndexOffset getPointerInfo(Register Ptr, MachineRegisterInfo &MRI);

/// Compute whether or not a memory access at \p MI1 aliases with an access at
/// \p MI2 \returns true if either alias/no-alias is known. Sets \p IsAlias
/// accordingly.
bool aliasIsKnownForLoadStore(const MachineInstr &MI1, const MachineInstr &MI2,
                              bool &IsAlias, MachineRegisterInfo &MRI);

/// Returns true if the instruction \p MI may alias \p Other.
/// This function uses multiple strategies to detect aliasing, whereas
/// aliasIsKnownForLoadStore just looks at the addresses of load/stores and is
/// tries to reason about base/index/offsets.
bool instMayAlias(const MachineInstr &MI, const MachineInstr &Other,
                  MachineRegisterInfo &MRI, AliasAnalysis *AA);
} // namespace GISelAddressing

usingnamespaceGISelAddressing;

class LoadStoreOpt : public MachineFunctionPass { … };

} // End namespace llvm.

#endif