1 //===- HexagonSubtarget.h - Define Subtarget for the Hexagon ----*- 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 Hexagon specific subclass of TargetSubtarget.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_LIB_TARGET_HEXAGON_HEXAGONSUBTARGET_H
14 #define LLVM_LIB_TARGET_HEXAGON_HEXAGONSUBTARGET_H
15 
16 #include "HexagonArch.h"
17 #include "HexagonFrameLowering.h"
18 #include "HexagonISelLowering.h"
19 #include "HexagonInstrInfo.h"
20 #include "HexagonRegisterInfo.h"
21 #include "HexagonSelectionDAGInfo.h"
22 #include "llvm/ADT/SmallSet.h"
23 #include "llvm/ADT/StringRef.h"
24 #include "llvm/CodeGen/ScheduleDAGMutation.h"
25 #include "llvm/CodeGen/TargetSubtargetInfo.h"
26 #include "llvm/MC/MCInstrItineraries.h"
27 #include "llvm/Support/Alignment.h"
28 #include <memory>
29 #include <string>
30 #include <vector>
31 
32 #define GET_SUBTARGETINFO_HEADER
33 #include "HexagonGenSubtargetInfo.inc"
34 
35 namespace llvm {
36 
37 class MachineInstr;
38 class SDep;
39 class SUnit;
40 class TargetMachine;
41 class Triple;
42 
43 class HexagonSubtarget : public HexagonGenSubtargetInfo {
44   virtual void anchor();
45 
46   bool UseHVX64BOps = false;
47   bool UseHVX128BOps = false;
48 
49   bool UseAudioOps = false;
50   bool UseCompound = false;
51   bool UseLongCalls = false;
52   bool UseMemops = false;
53   bool UsePackets = false;
54   bool UseNewValueJumps = false;
55   bool UseNewValueStores = false;
56   bool UseSmallData = false;
57   bool UseUnsafeMath = false;
58   bool UseZRegOps = false;
59 
60   bool HasPreV65 = false;
61   bool HasMemNoShuf = false;
62   bool EnableDuplex = false;
63   bool ReservedR19 = false;
64   bool NoreturnStackElim = false;
65 
66 public:
67   Hexagon::ArchEnum HexagonArchVersion;
68   Hexagon::ArchEnum HexagonHVXVersion = Hexagon::ArchEnum::NoArch;
69   CodeGenOpt::Level OptLevel;
70   /// True if the target should use Back-Skip-Back scheduling. This is the
71   /// default for V60.
72   bool UseBSBScheduling;
73 
74   struct UsrOverflowMutation : public ScheduleDAGMutation {
75     void apply(ScheduleDAGInstrs *DAG) override;
76   };
77   struct HVXMemLatencyMutation : public ScheduleDAGMutation {
78     void apply(ScheduleDAGInstrs *DAG) override;
79   };
80   struct CallMutation : public ScheduleDAGMutation {
81     void apply(ScheduleDAGInstrs *DAG) override;
82   private:
83     bool shouldTFRICallBind(const HexagonInstrInfo &HII,
84           const SUnit &Inst1, const SUnit &Inst2) const;
85   };
86   struct BankConflictMutation : public ScheduleDAGMutation {
87     void apply(ScheduleDAGInstrs *DAG) override;
88   };
89 
90 private:
91   enum HexagonProcFamilyEnum { Others, TinyCore };
92 
93   std::string CPUString;
94   Triple TargetTriple;
95 
96   // The following objects can use the TargetTriple, so they must be
97   // declared after it.
98   HexagonProcFamilyEnum HexagonProcFamily = Others;
99   HexagonInstrInfo InstrInfo;
100   HexagonRegisterInfo RegInfo;
101   HexagonTargetLowering TLInfo;
102   HexagonSelectionDAGInfo TSInfo;
103   HexagonFrameLowering FrameLowering;
104   InstrItineraryData InstrItins;
105 
106 public:
107   HexagonSubtarget(const Triple &TT, StringRef CPU, StringRef FS,
108                    const TargetMachine &TM);
109 
110   const Triple &getTargetTriple() const { return TargetTriple; }
111   bool isEnvironmentMusl() const {
112     return TargetTriple.getEnvironment() == Triple::Musl;
113   }
114 
115   /// getInstrItins - Return the instruction itineraries based on subtarget
116   /// selection.
117   const InstrItineraryData *getInstrItineraryData() const override {
118     return &InstrItins;
119   }
120   const HexagonInstrInfo *getInstrInfo() const override { return &InstrInfo; }
121   const HexagonRegisterInfo *getRegisterInfo() const override {
122     return &RegInfo;
123   }
124   const HexagonTargetLowering *getTargetLowering() const override {
125     return &TLInfo;
126   }
127   const HexagonFrameLowering *getFrameLowering() const override {
128     return &FrameLowering;
129   }
130   const HexagonSelectionDAGInfo *getSelectionDAGInfo() const override {
131     return &TSInfo;
132   }
133 
134   HexagonSubtarget &initializeSubtargetDependencies(StringRef CPU,
135                                                     StringRef FS);
136 
137   /// ParseSubtargetFeatures - Parses features string setting specified
138   /// subtarget options.  Definition of function is auto generated by tblgen.
139   void ParseSubtargetFeatures(StringRef CPU, StringRef TuneCPU, StringRef FS);
140 
141   bool hasV5Ops() const {
142     return getHexagonArchVersion() >= Hexagon::ArchEnum::V5;
143   }
144   bool hasV5OpsOnly() const {
145     return getHexagonArchVersion() == Hexagon::ArchEnum::V5;
146   }
147   bool hasV55Ops() const {
148     return getHexagonArchVersion() >= Hexagon::ArchEnum::V55;
149   }
150   bool hasV55OpsOnly() const {
151     return getHexagonArchVersion() == Hexagon::ArchEnum::V55;
152   }
153   bool hasV60Ops() const {
154     return getHexagonArchVersion() >= Hexagon::ArchEnum::V60;
155   }
156   bool hasV60OpsOnly() const {
157     return getHexagonArchVersion() == Hexagon::ArchEnum::V60;
158   }
159   bool hasV62Ops() const {
160     return getHexagonArchVersion() >= Hexagon::ArchEnum::V62;
161   }
162   bool hasV62OpsOnly() const {
163     return getHexagonArchVersion() == Hexagon::ArchEnum::V62;
164   }
165   bool hasV65Ops() const {
166     return getHexagonArchVersion() >= Hexagon::ArchEnum::V65;
167   }
168   bool hasV65OpsOnly() const {
169     return getHexagonArchVersion() == Hexagon::ArchEnum::V65;
170   }
171   bool hasV66Ops() const {
172     return getHexagonArchVersion() >= Hexagon::ArchEnum::V66;
173   }
174   bool hasV66OpsOnly() const {
175     return getHexagonArchVersion() == Hexagon::ArchEnum::V66;
176   }
177   bool hasV67Ops() const {
178     return getHexagonArchVersion() >= Hexagon::ArchEnum::V67;
179   }
180   bool hasV67OpsOnly() const {
181     return getHexagonArchVersion() == Hexagon::ArchEnum::V67;
182   }
183   bool hasV68Ops() const {
184     return getHexagonArchVersion() >= Hexagon::ArchEnum::V68;
185   }
186   bool hasV68OpsOnly() const {
187     return getHexagonArchVersion() == Hexagon::ArchEnum::V68;
188   }
189 
190   bool useAudioOps() const { return UseAudioOps; }
191   bool useCompound() const { return UseCompound; }
192   bool useLongCalls() const { return UseLongCalls; }
193   bool useMemops() const { return UseMemops; }
194   bool usePackets() const { return UsePackets; }
195   bool useNewValueJumps() const { return UseNewValueJumps; }
196   bool useNewValueStores() const { return UseNewValueStores; }
197   bool useSmallData() const { return UseSmallData; }
198   bool useUnsafeMath() const { return UseUnsafeMath; }
199   bool useZRegOps() const { return UseZRegOps; }
200 
201   bool isTinyCore() const { return HexagonProcFamily == TinyCore; }
202   bool isTinyCoreWithDuplex() const { return isTinyCore() && EnableDuplex; }
203 
204   bool useHVXOps() const {
205     return HexagonHVXVersion > Hexagon::ArchEnum::NoArch;
206   }
207   bool useHVXV60Ops() const {
208     return HexagonHVXVersion >= Hexagon::ArchEnum::V60;
209   }
210   bool useHVXV62Ops() const {
211     return HexagonHVXVersion >= Hexagon::ArchEnum::V62;
212   }
213   bool useHVXV65Ops() const {
214     return HexagonHVXVersion >= Hexagon::ArchEnum::V65;
215   }
216   bool useHVXV66Ops() const {
217     return HexagonHVXVersion >= Hexagon::ArchEnum::V66;
218   }
219   bool useHVXV67Ops() const {
220     return HexagonHVXVersion >= Hexagon::ArchEnum::V67;
221   }
222   bool useHVXV68Ops() const {
223     return HexagonHVXVersion >= Hexagon::ArchEnum::V68;
224   }
225   bool useHVX128BOps() const { return useHVXOps() && UseHVX128BOps; }
226   bool useHVX64BOps() const { return useHVXOps() && UseHVX64BOps; }
227 
228   bool hasMemNoShuf() const { return HasMemNoShuf; }
229   bool hasReservedR19() const { return ReservedR19; }
230   bool usePredicatedCalls() const;
231 
232   bool noreturnStackElim() const { return NoreturnStackElim; }
233 
234   bool useBSBScheduling() const { return UseBSBScheduling; }
235   bool enableMachineScheduler() const override;
236 
237   // Always use the TargetLowering default scheduler.
238   // FIXME: This will use the vliw scheduler which is probably just hurting
239   // compiler time and will be removed eventually anyway.
240   bool enableMachineSchedDefaultSched() const override { return false; }
241 
242   // For use with PostRAScheduling: get the anti-dependence breaking that should
243   // be performed before post-RA scheduling.
244   AntiDepBreakMode getAntiDepBreakMode() const override { return ANTIDEP_ALL; }
245   /// True if the subtarget should run a scheduler after register
246   /// allocation.
247   bool enablePostRAScheduler() const override { return true; }
248 
249   bool enableSubRegLiveness() const override;
250 
251   const std::string &getCPUString () const { return CPUString; }
252 
253   const Hexagon::ArchEnum &getHexagonArchVersion() const {
254     return HexagonArchVersion;
255   }
256 
257   void getPostRAMutations(
258       std::vector<std::unique_ptr<ScheduleDAGMutation>> &Mutations)
259       const override;
260 
261   void getSMSMutations(
262       std::vector<std::unique_ptr<ScheduleDAGMutation>> &Mutations)
263       const override;
264 
265   /// Enable use of alias analysis during code generation (during MI
266   /// scheduling, DAGCombine, etc.).
267   bool useAA() const override;
268 
269   /// Perform target specific adjustments to the latency of a schedule
270   /// dependency.
271   void adjustSchedDependency(SUnit *Def, int DefOpIdx, SUnit *Use, int UseOpIdx,
272                              SDep &Dep) const override;
273 
274   unsigned getVectorLength() const {
275     assert(useHVXOps());
276     if (useHVX64BOps())
277       return 64;
278     if (useHVX128BOps())
279       return 128;
280     llvm_unreachable("Invalid HVX vector length settings");
281   }
282 
283   ArrayRef<MVT> getHVXElementTypes() const {
284     static MVT Types[] = { MVT::i8, MVT::i16, MVT::i32 };
285     return makeArrayRef(Types);
286   }
287 
288   bool isHVXElementType(MVT Ty, bool IncludeBool = false) const;
289   bool isHVXVectorType(MVT VecTy, bool IncludeBool = false) const;
290   bool isTypeForHVX(Type *VecTy, bool IncludeBool = false) const;
291 
292   Align getTypeAlignment(MVT Ty) const {
293     if (isHVXVectorType(Ty, true))
294       return Align(getVectorLength());
295     return Align(std::max<unsigned>(1, Ty.getSizeInBits() / 8));
296   }
297 
298   unsigned getL1CacheLineSize() const;
299   unsigned getL1PrefetchDistance() const;
300 
301 private:
302   // Helper function responsible for increasing the latency only.
303   void updateLatency(MachineInstr &SrcInst, MachineInstr &DstInst, SDep &Dep)
304       const;
305   void restoreLatency(SUnit *Src, SUnit *Dst) const;
306   void changeLatency(SUnit *Src, SUnit *Dst, unsigned Lat) const;
307   bool isBestZeroLatency(SUnit *Src, SUnit *Dst, const HexagonInstrInfo *TII,
308       SmallSet<SUnit*, 4> &ExclSrc, SmallSet<SUnit*, 4> &ExclDst) const;
309 };
310 
311 } // end namespace llvm
312 
313 #endif // LLVM_LIB_TARGET_HEXAGON_HEXAGONSUBTARGET_H
314