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//==-- llvm/CodeGen/GlobalISel/Utils.h ---------------------------*- C++ -*-==//
//                     The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
/// \file This file declares the API of helper functions used throughout the
/// GlobalISel pipeline.


#include "llvm/ADT/StringRef.h"

namespace llvm {

class MachineFunction;
class MachineInstr;
class MachineOptimizationRemarkEmitter;
class MachineOptimizationRemarkMissed;
class MachineRegisterInfo;
class MCInstrDesc;
class RegisterBankInfo;
class TargetInstrInfo;
class TargetPassConfig;
class TargetRegisterInfo;
class Twine;
class ConstantFP;

/// Try to constrain Reg so that it is usable by argument OpIdx of the
/// provided MCInstrDesc \p II. If this fails, create a new virtual
/// register in the correct class and insert a COPY before \p InsertPt.
/// The debug location of \p InsertPt is used for the new copy.
/// \return The virtual register constrained to the right register class.
unsigned constrainOperandRegClass(const MachineFunction &MF,
                                  const TargetRegisterInfo &TRI,
                                  MachineRegisterInfo &MRI,
                                  const TargetInstrInfo &TII,
                                  const RegisterBankInfo &RBI,
                                  MachineInstr &InsertPt, const MCInstrDesc &II,
                                  unsigned Reg, unsigned OpIdx);

/// Check whether an instruction \p MI is dead: it only defines dead virtual
/// registers, and doesn't have other side effects.
bool isTriviallyDead(const MachineInstr &MI, const MachineRegisterInfo &MRI);

/// Report an ISel error as a missed optimization remark to the LLVMContext's
/// diagnostic stream.  Set the FailedISel MachineFunction property.
void reportGISelFailure(MachineFunction &MF, const TargetPassConfig &TPC,
                        MachineOptimizationRemarkEmitter &MORE,
                        MachineOptimizationRemarkMissed &R);

void reportGISelFailure(MachineFunction &MF, const TargetPassConfig &TPC,
                        MachineOptimizationRemarkEmitter &MORE,
                        const char *PassName, StringRef Msg,
                        const MachineInstr &MI);

Optional<int64_t> getConstantVRegVal(unsigned VReg,
                                     const MachineRegisterInfo &MRI);
const ConstantFP* getConstantFPVRegVal(unsigned VReg,
                                       const MachineRegisterInfo &MRI);

} // End namespace llvm.