Legalizer.h

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//== llvm/CodeGen/GlobalISel/Legalizer.h ---------------- -*- 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 A pass to convert the target-illegal operations created by IR -> MIR
/// translation into ones the target expects to be able to select. This may
/// occur in multiple phases, for example G_ADD <2 x i8> -> G_ADD <2 x i16> ->
/// G_ADD <4 x i16>.
///
/// The LegalizeHelper class is where most of the work happens, and is designed
/// to be callable from other passes that find themselves with an illegal
/// instruction.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_CODEGEN_GLOBALISEL_LEGALIZER_H
#define LLVM_CODEGEN_GLOBALISEL_LEGALIZER_H
 
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/CodeGen/GlobalISel/GISelValueTracking.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/Support/Compiler.h"
 
namespace llvm {
 
class LegalizerInfo;
class MachineIRBuilder;
class MachineInstr;
class GISelChangeObserver;
class LostDebugLocObserver;
 
class LLVM_ABI Legalizer : public MachineFunctionPass {
public:
  static char ID;
 
  struct MFResult {
    bool Changed;
    const MachineInstr *FailedOn;
  };
 
private:
  /// Initialize the field members using \p MF.
  void init(MachineFunction &MF);
 
public:
  // Ctor, nothing fancy.
  Legalizer();
 
  StringRef getPassName() const override { return "Legalizer"; }
 
  void getAnalysisUsage(AnalysisUsage &AU) const override;
 
  MachineFunctionProperties getRequiredProperties() const override {
    return MachineFunctionProperties().setIsSSA();
  }
 
  MachineFunctionProperties getSetProperties() const override {
    return MachineFunctionProperties().setLegalized();
  }
 
  MachineFunctionProperties getClearedProperties() const override {
    return MachineFunctionProperties().setNoPHIs().setNoVRegs();
  }
 
  bool runOnMachineFunction(MachineFunction &MF) override;
 
  static MFResult
  legalizeMachineFunction(MachineFunction &MF, const LegalizerInfo &LI,
                          ArrayRef<GISelChangeObserver *> AuxObservers,
                          LostDebugLocObserver &LocObserver,
                          MachineIRBuilder &MIRBuilder, GISelValueTracking *VT);
};
} // End namespace llvm.
 
#endif