SIRegisterInfo.h

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//===-- SIRegisterInfo.h - SI Register Info Interface ----------*- C++ -*--===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
/// \file
/// \brief Interface definition for SIRegisterInfo
//
//===----------------------------------------------------------------------===//


#ifndef LLVM_LIB_TARGET_R600_SIREGISTERINFO_H
#define LLVM_LIB_TARGET_R600_SIREGISTERINFO_H

#include "AMDGPURegisterInfo.h"

namespace llvm {

struct SIRegisterInfo : public AMDGPURegisterInfo {

  SIRegisterInfo(const AMDGPUSubtarget &st);

  BitVector getReservedRegs(const MachineFunction &MF) const override;

  unsigned getRegPressureLimit(const TargetRegisterClass *RC,
                               MachineFunction &MF) const override;

  bool requiresRegisterScavenging(const MachineFunction &Fn) const override;

  void eliminateFrameIndex(MachineBasicBlock::iterator MI, int SPAdj,
                           unsigned FIOperandNum,
                           RegScavenger *RS) const override;

  /// \brief get the register class of the specified type to use in the
  /// CFGStructurizer
  const TargetRegisterClass * getCFGStructurizerRegClass(MVT VT) const override;

  unsigned getHWRegIndex(unsigned Reg) const override;

  /// \brief Return the 'base' register class for this register.
  /// e.g. SGPR0 => SReg_32, VGPR => VReg_32 SGPR0_SGPR1 -> SReg_32, etc.
  const TargetRegisterClass *getPhysRegClass(unsigned Reg) const;

  /// \returns true if this class contains only SGPR registers
  bool isSGPRClass(const TargetRegisterClass *RC) const;

  /// \returns true if this class contains VGPR registers.
  bool hasVGPRs(const TargetRegisterClass *RC) const;

  /// \returns A VGPR reg class with the same width as \p SRC
  const TargetRegisterClass *getEquivalentVGPRClass(
                                          const TargetRegisterClass *SRC) const;

  /// \returns The register class that is used for a sub-register of \p RC for
  /// the given \p SubIdx.  If \p SubIdx equals NoSubRegister, \p RC will
  /// be returned.
  const TargetRegisterClass *getSubRegClass(const TargetRegisterClass *RC,
                                            unsigned SubIdx) const;

  /// \p Channel This is the register channel (e.g. a value from 0-16), not the
  ///            SubReg index.
  /// \returns The sub-register of Reg that is in Channel.
  unsigned getPhysRegSubReg(unsigned Reg, const TargetRegisterClass *SubRC,
                            unsigned Channel) const;

  /// \returns True if operands defined with this register class can accept
  /// inline immediates.
  bool regClassCanUseImmediate(int RCID) const;

  /// \returns True if operands defined with this register class can accept
  /// inline immediates.
  bool regClassCanUseImmediate(const TargetRegisterClass *RC) const;

  enum PreloadedValue {
    TGID_X,
    TGID_Y,
    TGID_Z,
    SCRATCH_WAVE_OFFSET,
    SCRATCH_PTR
  };

  /// \brief Returns the physical register that \p Value is stored in.
  unsigned getPreloadedValue(const MachineFunction &MF,
                             enum PreloadedValue Value) const;

};

} // End namespace llvm

#endif