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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 for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "SystemZ.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include ""
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
struct SystemZRegisterInfo : public SystemZGenRegisterInfo {
/// 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(unsigned 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;
bool trackLivenessAfterRegAlloc(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