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//===-- SystemZRegisterInfo.h - SystemZ register information ----*- 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZREGISTERINFO_H
#define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZREGISTERINFO_H
#include "SystemZ.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#define GET_REGINFO_HEADER
#include "SystemZGenRegisterInfo.inc"
namespace llvm {
class LiveIntervals;
namespace SystemZ {
// Return the subreg to use for referring to the even and odd registers
// in a GR128 pair. Is32Bit says whether we want a GR32 or GR64.
inline unsigned even128(bool Is32bit) {
return Is32bit ? subreg_hl32 : subreg_h64;
}
inline unsigned odd128(bool Is32bit) {
return Is32bit ? subreg_l32 : subreg_l64;
}
// Reg should be a 32-bit GPR. Return true if it is a high register rather
// than a low register.
inline bool isHighReg(unsigned int Reg) {
if (SystemZ::GRH32BitRegClass.contains(Reg))
return true;
assert(SystemZ::GR32BitRegClass.contains(Reg) && "Invalid GRX32");
return false;
}
} // end namespace SystemZ
/// A SystemZ-specific class detailing special use registers
/// particular for calling conventions.
/// It is abstract, all calling conventions must override and
/// define the pure virtual member function defined in this class.
class SystemZCallingConventionRegisters {
public:
/// \returns the register that keeps the
/// return function address.
virtual int getReturnFunctionAddressRegister() = 0;
/// \returns the register that keeps the
/// stack pointer address.
virtual int getStackPointerRegister() = 0;
/// \returns the register that keeps the
/// frame pointer address.
virtual int getFramePointerRegister() = 0;
/// \returns an array of all the callee saved registers.
virtual const MCPhysReg *
getCalleeSavedRegs(const MachineFunction *MF) const = 0;
/// \returns the mask of all the call preserved registers.
virtual const uint32_t *getCallPreservedMask(const MachineFunction &MF,
CallingConv::ID CC) const = 0;
/// Destroys the object. Bogus destructor allowing derived classes
/// to override it.
virtual ~SystemZCallingConventionRegisters(){};
};
/// XPLINK64 calling convention specific use registers
/// Particular to z/OS when in 64 bit mode
class SystemZXPLINK64Registers : public SystemZCallingConventionRegisters {
public:
int getReturnFunctionAddressRegister() override final {
return SystemZ::R7D;
};
int getStackPointerRegister() override final { return SystemZ::R4D; };
int getFramePointerRegister() override final { return SystemZ::R8D; };
const MCPhysReg *
getCalleeSavedRegs(const MachineFunction *MF) const override final;
const uint32_t *getCallPreservedMask(const MachineFunction &MF,
CallingConv::ID CC) const override final;
/// Destroys the object. Bogus destructor overriding base class destructor
~SystemZXPLINK64Registers(){};
};
/// ELF calling convention specific use registers
/// Particular when on zLinux in 64 bit mode
class SystemZELFRegisters : public SystemZCallingConventionRegisters {
public:
int getReturnFunctionAddressRegister() override final {
return SystemZ::R14D;
};
int getStackPointerRegister() override final { return SystemZ::R15D; };
int getFramePointerRegister() override final { return SystemZ::R11D; };
const MCPhysReg *
getCalleeSavedRegs(const MachineFunction *MF) const override final;
const uint32_t *getCallPreservedMask(const MachineFunction &MF,
CallingConv::ID CC) const override final;
/// Destroys the object. Bogus destructor overriding base class destructor
~SystemZELFRegisters(){};
};
struct SystemZRegisterInfo : public SystemZGenRegisterInfo {
public:
SystemZRegisterInfo(unsigned int RA);
/// getPointerRegClass - Return the register class to use to hold pointers.
/// This is currently only used by LOAD_STACK_GUARD, which requires a non-%r0
/// register, hence ADDR64.
const TargetRegisterClass *
getPointerRegClass(const MachineFunction &MF,
unsigned Kind=0) const override {
return &SystemZ::ADDR64BitRegClass;
}
/// getCrossCopyRegClass - Returns a legal register class to copy a register
/// in the specified class to or from. Returns NULL if it is possible to copy
/// between a two registers of the specified class.
const TargetRegisterClass *
getCrossCopyRegClass(const TargetRegisterClass *RC) const override;
bool getRegAllocationHints(Register VirtReg, ArrayRef<MCPhysReg> Order,
SmallVectorImpl<MCPhysReg> &Hints,
const MachineFunction &MF, const VirtRegMap *VRM,
const LiveRegMatrix *Matrix) const override;
// Override TargetRegisterInfo.h.
bool requiresRegisterScavenging(const MachineFunction &MF) const override {
return true;
}
bool requiresFrameIndexScavenging(const MachineFunction &MF) const override {
return true;
}
const MCPhysReg *getCalleeSavedRegs(const MachineFunction *MF) const override;
const uint32_t *getCallPreservedMask(const MachineFunction &MF,
CallingConv::ID CC) const override;
BitVector getReservedRegs(const MachineFunction &MF) const override;
void eliminateFrameIndex(MachineBasicBlock::iterator MI,
int SPAdj, unsigned FIOperandNum,
RegScavenger *RS) const override;
/// SrcRC and DstRC will be morphed into NewRC if this returns true.
bool shouldCoalesce(MachineInstr *MI,
const TargetRegisterClass *SrcRC,
unsigned SubReg,
const TargetRegisterClass *DstRC,
unsigned DstSubReg,
const TargetRegisterClass *NewRC,
LiveIntervals &LIS) const override;
Register getFrameRegister(const MachineFunction &MF) const override;
};
} // end namespace llvm
#endif
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