1 //===-- SystemZRegisterInfo.h - SystemZ register information ----*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZREGISTERINFO_H
11 #define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZREGISTERINFO_H
12
13 #include "SystemZ.h"
14 #include "llvm/CodeGen/TargetRegisterInfo.h"
15
16 #define GET_REGINFO_HEADER
17 #include "SystemZGenRegisterInfo.inc"
18
19 namespace llvm {
20
21 class LiveIntervals;
22
23 namespace SystemZ {
24 // Return the subreg to use for referring to the even and odd registers
25 // in a GR128 pair. Is32Bit says whether we want a GR32 or GR64.
even128(bool Is32bit)26 inline unsigned even128(bool Is32bit) {
27 return Is32bit ? subreg_hl32 : subreg_h64;
28 }
odd128(bool Is32bit)29 inline unsigned odd128(bool Is32bit) {
30 return Is32bit ? subreg_l32 : subreg_l64;
31 }
32 } // end namespace SystemZ
33
34 struct SystemZRegisterInfo : public SystemZGenRegisterInfo {
35 public:
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.
requiresRegisterScavengingSystemZRegisterInfo61 bool requiresRegisterScavenging(const MachineFunction &MF) const override {
62 return true;
63 }
requiresFrameIndexScavengingSystemZRegisterInfo64 bool requiresFrameIndexScavenging(const MachineFunction &MF) const override {
65 return true;
66 }
trackLivenessAfterRegAllocSystemZRegisterInfo67 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