1 //===-- SystemZSubtarget.h - SystemZ subtarget information -----*- C++ -*--===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file declares the SystemZ specific subclass of TargetSubtargetInfo.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZSUBTARGET_H
14 #define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZSUBTARGET_H
15 
16 #include "SystemZFrameLowering.h"
17 #include "SystemZISelLowering.h"
18 #include "SystemZInstrInfo.h"
19 #include "SystemZRegisterInfo.h"
20 #include "SystemZSelectionDAGInfo.h"
21 #include "llvm/CodeGen/TargetSubtargetInfo.h"
22 #include "llvm/IR/DataLayout.h"
23 #include "llvm/TargetParser/Triple.h"
24 #include <string>
25 
26 #define GET_SUBTARGETINFO_HEADER
27 #include "SystemZGenSubtargetInfo.inc"
28 
29 namespace llvm {
30 class GlobalValue;
31 class StringRef;
32 
33 class SystemZSubtarget : public SystemZGenSubtargetInfo {
34   virtual void anchor();
35 protected:
36 // Bool members corresponding to the SubtargetFeatures defined in tablegen.
37 #define GET_SUBTARGETINFO_MACRO(ATTRIBUTE, DEFAULT, GETTER)                    \
38   bool ATTRIBUTE = DEFAULT;
39 #include "SystemZGenSubtargetInfo.inc"
40 
41 private:
42   Triple TargetTriple;
43   std::unique_ptr<SystemZCallingConventionRegisters> SpecialRegisters;
44   SystemZInstrInfo InstrInfo;
45   SystemZTargetLowering TLInfo;
46   SystemZSelectionDAGInfo TSInfo;
47   std::unique_ptr<const SystemZFrameLowering> FrameLowering;
48 
49   SystemZSubtarget &initializeSubtargetDependencies(StringRef CPU,
50                                                     StringRef TuneCPU,
51                                                     StringRef FS);
52   SystemZCallingConventionRegisters *initializeSpecialRegisters();
53 
54 public:
55   SystemZSubtarget(const Triple &TT, const std::string &CPU,
56                    const std::string &TuneCPU, const std::string &FS,
57                    const TargetMachine &TM);
58 
59   SystemZCallingConventionRegisters *getSpecialRegisters() const {
60     assert(SpecialRegisters && "Unsupported SystemZ calling convention");
61     return SpecialRegisters.get();
62   }
63 
64   template <class SR> SR &getSpecialRegisters() const {
65     return *static_cast<SR *>(getSpecialRegisters());
66   }
67 
68   const TargetFrameLowering *getFrameLowering() const override {
69     return FrameLowering.get();
70   }
71 
72   template <class TFL> const TFL *getFrameLowering() const {
73     return static_cast<const TFL *>(getFrameLowering());
74   }
75 
76   const SystemZInstrInfo *getInstrInfo() const override { return &InstrInfo; }
77   const SystemZRegisterInfo *getRegisterInfo() const override {
78     return &InstrInfo.getRegisterInfo();
79   }
80   const SystemZTargetLowering *getTargetLowering() const override {
81     return &TLInfo;
82   }
83   const SelectionDAGTargetInfo *getSelectionDAGInfo() const override {
84     return &TSInfo;
85   }
86 
87   // True if the subtarget should run MachineScheduler after aggressive
88   // coalescing. This currently replaces the SelectionDAG scheduler with the
89   // "source" order scheduler.
90   bool enableMachineScheduler() const override { return true; }
91 
92   // This is important for reducing register pressure in vector code.
93   bool useAA() const override { return true; }
94 
95   // Always enable the early if-conversion pass.
96   bool enableEarlyIfConversion() const override { return true; }
97 
98   // Enable tracking of subregister liveness in register allocator.
99   bool enableSubRegLiveness() const override;
100 
101   // Automatically generated by tblgen.
102   void ParseSubtargetFeatures(StringRef CPU, StringRef TuneCPU, StringRef FS);
103 
104 // Getters for SubtargetFeatures defined in tablegen.
105 #define GET_SUBTARGETINFO_MACRO(ATTRIBUTE, DEFAULT, GETTER)                    \
106   bool GETTER() const { return ATTRIBUTE; }
107 #include "SystemZGenSubtargetInfo.inc"
108 
109   bool isAddressedViaADA(const GlobalValue *GV) const;
110 
111   // Return true if GV can be accessed using LARL for reloc model RM
112   // and code model CM.
113   bool isPC32DBLSymbol(const GlobalValue *GV, CodeModel::Model CM) const;
114 
115   bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
116 
117   // Returns TRUE if we are generating GOFF object code
118   bool isTargetGOFF() const { return TargetTriple.isOSBinFormatGOFF(); }
119 
120   // Returns TRUE if we are using XPLINK64 linkage convention
121   bool isTargetXPLINK64() const { return (isTargetGOFF() && isTargetzOS()); }
122 
123   // Returns TRUE if we are generating code for a s390x machine running zOS
124   bool isTargetzOS() const { return TargetTriple.isOSzOS(); }
125 };
126 } // end namespace llvm
127 
128 #endif
129