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//===-- SystemZRegisterInfo.h - SystemZ register information ----*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
#include "SystemZ.h"
#include "llvm/Target/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;
} // 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;
// 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;
/// \brief 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;
unsigned getFrameRegister(const MachineFunction &MF) const override;
} // end namespace llvm