1 //===-- RISCVInstrInfo.h - RISCV Instruction 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 contains the RISCV implementation of the TargetInstrInfo class.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_LIB_TARGET_RISCV_RISCVINSTRINFO_H
14 #define LLVM_LIB_TARGET_RISCV_RISCVINSTRINFO_H
15 
16 #include "RISCVRegisterInfo.h"
17 #include "llvm/CodeGen/TargetInstrInfo.h"
18 #include "llvm/IR/DiagnosticInfo.h"
19 
20 #define GET_INSTRINFO_HEADER
21 #define GET_INSTRINFO_OPERAND_ENUM
22 #include "RISCVGenInstrInfo.inc"
23 
24 namespace llvm {
25 
26 class RISCVSubtarget;
27 
28 namespace RISCVCC {
29 
30 enum CondCode {
31   COND_EQ,
32   COND_NE,
33   COND_LT,
34   COND_GE,
35   COND_LTU,
36   COND_GEU,
37   COND_INVALID
38 };
39 
40 CondCode getOppositeBranchCondition(CondCode);
41 
42 } // end of namespace RISCVCC
43 
44 class RISCVInstrInfo : public RISCVGenInstrInfo {
45 
46 public:
47   explicit RISCVInstrInfo(RISCVSubtarget &STI);
48 
49   MCInst getNop() const override;
50   const MCInstrDesc &getBrCond(RISCVCC::CondCode CC) const;
51 
52   unsigned isLoadFromStackSlot(const MachineInstr &MI,
53                                int &FrameIndex) const override;
54   unsigned isStoreToStackSlot(const MachineInstr &MI,
55                               int &FrameIndex) const override;
56 
57   void copyPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
58                    const DebugLoc &DL, MCRegister DstReg, MCRegister SrcReg,
59                    bool KillSrc) const override;
60 
61   void storeRegToStackSlot(MachineBasicBlock &MBB,
62                            MachineBasicBlock::iterator MBBI, Register SrcReg,
63                            bool IsKill, int FrameIndex,
64                            const TargetRegisterClass *RC,
65                            const TargetRegisterInfo *TRI) const override;
66 
67   void loadRegFromStackSlot(MachineBasicBlock &MBB,
68                             MachineBasicBlock::iterator MBBI, Register DstReg,
69                             int FrameIndex, const TargetRegisterClass *RC,
70                             const TargetRegisterInfo *TRI) const override;
71 
72   using TargetInstrInfo::foldMemoryOperandImpl;
73   MachineInstr *foldMemoryOperandImpl(MachineFunction &MF, MachineInstr &MI,
74                                       ArrayRef<unsigned> Ops,
75                                       MachineBasicBlock::iterator InsertPt,
76                                       int FrameIndex,
77                                       LiveIntervals *LIS = nullptr,
78                                       VirtRegMap *VRM = nullptr) const override;
79 
80   // Materializes the given integer Val into DstReg.
81   void movImm(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
82               const DebugLoc &DL, Register DstReg, uint64_t Val,
83               MachineInstr::MIFlag Flag = MachineInstr::NoFlags) const;
84 
85   unsigned getInstSizeInBytes(const MachineInstr &MI) const override;
86 
87   bool analyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
88                      MachineBasicBlock *&FBB,
89                      SmallVectorImpl<MachineOperand> &Cond,
90                      bool AllowModify) const override;
91 
92   unsigned insertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
93                         MachineBasicBlock *FBB, ArrayRef<MachineOperand> Cond,
94                         const DebugLoc &dl,
95                         int *BytesAdded = nullptr) const override;
96 
97   void insertIndirectBranch(MachineBasicBlock &MBB,
98                             MachineBasicBlock &NewDestBB,
99                             MachineBasicBlock &RestoreBB, const DebugLoc &DL,
100                             int64_t BrOffset, RegScavenger *RS) const override;
101 
102   unsigned removeBranch(MachineBasicBlock &MBB,
103                         int *BytesRemoved = nullptr) const override;
104 
105   bool
106   reverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const override;
107 
108   MachineBasicBlock *getBranchDestBlock(const MachineInstr &MI) const override;
109 
110   bool isBranchOffsetInRange(unsigned BranchOpc,
111                              int64_t BrOffset) const override;
112 
113   bool isAsCheapAsAMove(const MachineInstr &MI) const override;
114 
115   Optional<DestSourcePair>
116   isCopyInstrImpl(const MachineInstr &MI) const override;
117 
118   bool verifyInstruction(const MachineInstr &MI,
119                          StringRef &ErrInfo) const override;
120 
121   bool getMemOperandWithOffsetWidth(const MachineInstr &LdSt,
122                                     const MachineOperand *&BaseOp,
123                                     int64_t &Offset, unsigned &Width,
124                                     const TargetRegisterInfo *TRI) const;
125 
126   bool areMemAccessesTriviallyDisjoint(const MachineInstr &MIa,
127                                        const MachineInstr &MIb) const override;
128 
129 
130   std::pair<unsigned, unsigned>
131   decomposeMachineOperandsTargetFlags(unsigned TF) const override;
132 
133   ArrayRef<std::pair<unsigned, const char *>>
134   getSerializableDirectMachineOperandTargetFlags() const override;
135 
136   // Return true if the function can safely be outlined from.
137   bool isFunctionSafeToOutlineFrom(MachineFunction &MF,
138                                    bool OutlineFromLinkOnceODRs) const override;
139 
140   // Return true if MBB is safe to outline from, and return any target-specific
141   // information in Flags.
142   bool isMBBSafeToOutlineFrom(MachineBasicBlock &MBB,
143                               unsigned &Flags) const override;
144 
145   bool shouldOutlineFromFunctionByDefault(MachineFunction &MF) const override;
146 
147   // Calculate target-specific information for a set of outlining candidates.
148   outliner::OutlinedFunction getOutliningCandidateInfo(
149       std::vector<outliner::Candidate> &RepeatedSequenceLocs) const override;
150 
151   // Return if/how a given MachineInstr should be outlined.
152   outliner::InstrType getOutliningType(MachineBasicBlock::iterator &MBBI,
153                                        unsigned Flags) const override;
154 
155   // Insert a custom frame for outlined functions.
156   void buildOutlinedFrame(MachineBasicBlock &MBB, MachineFunction &MF,
157                           const outliner::OutlinedFunction &OF) const override;
158 
159   // Insert a call to an outlined function into a given basic block.
160   MachineBasicBlock::iterator
161   insertOutlinedCall(Module &M, MachineBasicBlock &MBB,
162                      MachineBasicBlock::iterator &It, MachineFunction &MF,
163                      outliner::Candidate &C) const override;
164 
165   bool findCommutedOpIndices(const MachineInstr &MI, unsigned &SrcOpIdx1,
166                              unsigned &SrcOpIdx2) const override;
167   MachineInstr *commuteInstructionImpl(MachineInstr &MI, bool NewMI,
168                                        unsigned OpIdx1,
169                                        unsigned OpIdx2) const override;
170 
171   MachineInstr *convertToThreeAddress(MachineInstr &MI, LiveVariables *LV,
172                                       LiveIntervals *LIS) const override;
173 
174   // MIR printer helper function to annotate Operands with a comment.
175   std::string
176   createMIROperandComment(const MachineInstr &MI, const MachineOperand &Op,
177                           unsigned OpIdx,
178                           const TargetRegisterInfo *TRI) const override;
179 
180   Register getVLENFactoredAmount(
181       MachineFunction &MF, MachineBasicBlock &MBB,
182       MachineBasicBlock::iterator II, const DebugLoc &DL, int64_t Amount,
183       MachineInstr::MIFlag Flag = MachineInstr::NoFlags) const;
184 
185 protected:
186   const RISCVSubtarget &STI;
187 };
188 
189 namespace RISCV {
190 
191 // Returns true if this is the sext.w pattern, addiw rd, rs1, 0.
192 bool isSEXT_W(const MachineInstr &MI);
193 bool isZEXT_W(const MachineInstr &MI);
194 bool isZEXT_B(const MachineInstr &MI);
195 
196 // Returns true if the given MI is an RVV instruction opcode for which we may
197 // expect to see a FrameIndex operand.
198 bool isRVVSpill(const MachineInstr &MI);
199 
200 Optional<std::pair<unsigned, unsigned>> isRVVSpillForZvlsseg(unsigned Opcode);
201 
202 bool isFaultFirstLoad(const MachineInstr &MI);
203 
204 // Implemented in RISCVGenInstrInfo.inc
205 int16_t getNamedOperandIdx(uint16_t Opcode, uint16_t NamedIndex);
206 
207 // Special immediate for AVL operand of V pseudo instructions to indicate VLMax.
208 static constexpr int64_t VLMaxSentinel = -1LL;
209 } // namespace RISCV
210 
211 namespace RISCVVPseudosTable {
212 
213 struct PseudoInfo {
214   uint16_t Pseudo;
215   uint16_t BaseInstr;
216 };
217 
218 #define GET_RISCVVPseudosTable_DECL
219 #include "RISCVGenSearchableTables.inc"
220 
221 } // end namespace RISCVVPseudosTable
222 
223 } // end namespace llvm
224 #endif
225