X86RegisterBankInfo.h

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//===- X86RegisterBankInfo ---------------------------------------*- 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 declares the targeting of the RegisterBankInfo class for X86.
/// \todo This should be generated by TableGen.
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_LIB_TARGET_X86_X86REGISTERBANKINFO_H
#define LLVM_LIB_TARGET_X86_X86REGISTERBANKINFO_H
 
#include "llvm/CodeGen/RegisterBankInfo.h"
 
#define GET_REGBANK_DECLARATIONS
#include "X86GenRegisterBank.inc"
 
namespace llvm {
 
class LLT;
 
class X86GenRegisterBankInfo : public RegisterBankInfo {
protected:
#define GET_TARGET_REGBANK_CLASS
#include "X86GenRegisterBank.inc"
#define GET_TARGET_REGBANK_INFO_CLASS
#include "X86GenRegisterBankInfo.def"
 
  static RegisterBankInfo::PartialMapping PartMappings[];
  static RegisterBankInfo::ValueMapping ValMappings[];
 
  static PartialMappingIdx getPartialMappingIdx(const MachineInstr &MI,
                                                const LLT &Ty, bool isFP);
  static const RegisterBankInfo::ValueMapping *
  getValueMapping(PartialMappingIdx Idx, unsigned NumOperands);
};
 
class TargetRegisterInfo;
 
/// This class provides the information for the target register banks.
class X86RegisterBankInfo final : public X86GenRegisterBankInfo {
private:
  /// Get an instruction mapping.
  /// \return An InstructionMappings with a statically allocated
  /// OperandsMapping.
  const InstructionMapping &getSameOperandsMapping(const MachineInstr &MI,
                                                   bool isFP) const;
 
  /// Track the bank of each instruction operand(register)
  static void
  getInstrPartialMappingIdxs(const MachineInstr &MI,
                             const MachineRegisterInfo &MRI, const bool isFP,
                             SmallVectorImpl<PartialMappingIdx> &OpRegBankIdx);
 
  /// Construct the instruction ValueMapping from PartialMappingIdxs
  /// \return true if mapping succeeded.
  static bool
  getInstrValueMapping(const MachineInstr &MI,
                       const SmallVectorImpl<PartialMappingIdx> &OpRegBankIdx,
                       SmallVectorImpl<const ValueMapping *> &OpdsMapping);
 
  // Maximum recursion depth for hasFPConstraints.
  const unsigned MaxFPRSearchDepth = 2;
 
  /// \returns true if \p MI only uses and defines FPRs.
  bool hasFPConstraints(const MachineInstr &MI, const MachineRegisterInfo &MRI,
                        const TargetRegisterInfo &TRI,
                        unsigned Depth = 0) const;
 
  /// \returns true if \p MI only uses FPRs.
  bool onlyUsesFP(const MachineInstr &MI, const MachineRegisterInfo &MRI,
                  const TargetRegisterInfo &TRI, unsigned Depth = 0) const;
 
  /// \returns true if \p MI only defines FPRs.
  bool onlyDefinesFP(const MachineInstr &MI, const MachineRegisterInfo &MRI,
                     const TargetRegisterInfo &TRI, unsigned Depth = 0) const;
 
public:
  X86RegisterBankInfo(const TargetRegisterInfo &TRI);
 
  InstructionMappings
  getInstrAlternativeMappings(const MachineInstr &MI) const override;
 
  /// See RegisterBankInfo::applyMapping.
  void applyMappingImpl(MachineIRBuilder &Builder,
                        const OperandsMapper &OpdMapper) const override;
 
  const InstructionMapping &
  getInstrMapping(const MachineInstr &MI) const override;
};
 
} // namespace llvm
#endif