SystemZRegisterInfo.h revision 344779
1223534Shselasky//===-- SystemZRegisterInfo.h - SystemZ register information ----*- C++ -*-===// 2223534Shselasky// 3223534Shselasky// The LLVM Compiler Infrastructure 4223534Shselasky// 5223534Shselasky// This file is distributed under the University of Illinois Open Source 6223534Shselasky// License. See LICENSE.TXT for details. 7223534Shselasky// 8223534Shselasky//===----------------------------------------------------------------------===// 9223534Shselasky 10223534Shselasky#ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZREGISTERINFO_H 11223534Shselasky#define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZREGISTERINFO_H 12223534Shselasky 13223534Shselasky#include "SystemZ.h" 14223534Shselasky#include "llvm/CodeGen/TargetRegisterInfo.h" 15223534Shselasky 16223534Shselasky#define GET_REGINFO_HEADER 17223534Shselasky#include "SystemZGenRegisterInfo.inc" 18223534Shselasky 19223534Shselaskynamespace llvm { 20223534Shselasky 21223534Shselaskyclass LiveIntervals; 22223534Shselasky 23223534Shselaskynamespace SystemZ { 24223534Shselasky// Return the subreg to use for referring to the even and odd registers 25223534Shselasky// in a GR128 pair. Is32Bit says whether we want a GR32 or GR64. 26223534Shselaskyinline unsigned even128(bool Is32bit) { 27223534Shselasky return Is32bit ? subreg_hl32 : subreg_h64; 28223534Shselasky} 29223534Shselaskyinline unsigned odd128(bool Is32bit) { 30223534Shselasky return Is32bit ? subreg_l32 : subreg_l64; 31223534Shselasky} 32223534Shselasky} // end namespace SystemZ 33223534Shselasky 34struct SystemZRegisterInfo : public SystemZGenRegisterInfo { 35public: 36 SystemZRegisterInfo(); 37 38 /// getPointerRegClass - Return the register class to use to hold pointers. 39 /// This is currently only used by LOAD_STACK_GUARD, which requires a non-%r0 40 /// register, hence ADDR64. 41 const TargetRegisterClass * 42 getPointerRegClass(const MachineFunction &MF, 43 unsigned Kind=0) const override { 44 return &SystemZ::ADDR64BitRegClass; 45 } 46 47 /// getCrossCopyRegClass - Returns a legal register class to copy a register 48 /// in the specified class to or from. Returns NULL if it is possible to copy 49 /// between a two registers of the specified class. 50 const TargetRegisterClass * 51 getCrossCopyRegClass(const TargetRegisterClass *RC) const override; 52 53 bool getRegAllocationHints(unsigned VirtReg, 54 ArrayRef<MCPhysReg> Order, 55 SmallVectorImpl<MCPhysReg> &Hints, 56 const MachineFunction &MF, 57 const VirtRegMap *VRM, 58 const LiveRegMatrix *Matrix) const override; 59 60 // Override TargetRegisterInfo.h. 61 bool requiresRegisterScavenging(const MachineFunction &MF) const override { 62 return true; 63 } 64 bool requiresFrameIndexScavenging(const MachineFunction &MF) const override { 65 return true; 66 } 67 bool trackLivenessAfterRegAlloc(const MachineFunction &MF) const override { 68 return true; 69 } 70 const MCPhysReg *getCalleeSavedRegs(const MachineFunction *MF) const override; 71 const uint32_t *getCallPreservedMask(const MachineFunction &MF, 72 CallingConv::ID CC) const override; 73 BitVector getReservedRegs(const MachineFunction &MF) const override; 74 void eliminateFrameIndex(MachineBasicBlock::iterator MI, 75 int SPAdj, unsigned FIOperandNum, 76 RegScavenger *RS) const override; 77 78 /// SrcRC and DstRC will be morphed into NewRC if this returns true. 79 bool shouldCoalesce(MachineInstr *MI, 80 const TargetRegisterClass *SrcRC, 81 unsigned SubReg, 82 const TargetRegisterClass *DstRC, 83 unsigned DstSubReg, 84 const TargetRegisterClass *NewRC, 85 LiveIntervals &LIS) const override; 86 87 unsigned getFrameRegister(const MachineFunction &MF) const override; 88}; 89 90} // end namespace llvm 91 92#endif 93