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 SystemZREGISTERINFO_H
11 #define SystemZREGISTERINFO_H
12 
13 #include "SystemZ.h"
14 #include "llvm/Target/TargetRegisterInfo.h"
15 
16 #define GET_REGINFO_HEADER
17 #include "SystemZGenRegisterInfo.inc"
18 
19 namespace llvm {
20 
21 namespace SystemZ {
22   // Return the subreg to use for referring to the even and odd registers
23   // in a GR128 pair.  Is32Bit says whether we want a GR32 or GR64.
24   inline unsigned even128(bool Is32bit) {
25     return Is32bit ? subreg_32bit : subreg_high;
26   }
27   inline unsigned odd128(bool Is32bit) {
28     return Is32bit ? subreg_low32 : subreg_low;
29   }
30 }
31 
32 class SystemZSubtarget;
33 class SystemZInstrInfo;
34 
35 struct SystemZRegisterInfo : public SystemZGenRegisterInfo {
36 private:
37   SystemZTargetMachine &TM;
38   const SystemZInstrInfo &TII;
39 
40 public:
41   SystemZRegisterInfo(SystemZTargetMachine &tm, const SystemZInstrInfo &tii);
42 
43   // Override TargetRegisterInfo.h.
44   virtual bool requiresRegisterScavenging(const MachineFunction &MF) const
45     LLVM_OVERRIDE {
46     return true;
47   }
48   virtual bool requiresFrameIndexScavenging(const MachineFunction &MF) const
49     LLVM_OVERRIDE {
50     return true;
51   }
52   virtual const uint16_t *getCalleeSavedRegs(const MachineFunction *MF = 0)
53     const LLVM_OVERRIDE;
54   virtual BitVector getReservedRegs(const MachineFunction &MF)
55     const LLVM_OVERRIDE;
56   virtual bool saveScavengerRegister(MachineBasicBlock &MBB,
57                                      MachineBasicBlock::iterator SaveMBBI,
58                                      MachineBasicBlock::iterator &UseMBBI,
59                                      const TargetRegisterClass *RC,
60                                      unsigned Reg) const LLVM_OVERRIDE;
61   virtual void eliminateFrameIndex(MachineBasicBlock::iterator MI,
62                                    int SPAdj, unsigned FIOperandNum,
63                                    RegScavenger *RS) const LLVM_OVERRIDE;
64   virtual unsigned getFrameRegister(const MachineFunction &MF) const
65     LLVM_OVERRIDE;
66 };
67 
68 } // end namespace llvm
69 
70 #endif
71