| //===-- PPCInstrInfo.h - PowerPC Instruction Information --------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains the PowerPC implementation of the TargetInstrInfo class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIB_TARGET_POWERPC_PPCINSTRINFO_H |
| #define LLVM_LIB_TARGET_POWERPC_PPCINSTRINFO_H |
| |
| #include "PPC.h" |
| #include "PPCRegisterInfo.h" |
| #include "llvm/Target/TargetInstrInfo.h" |
| |
| #define GET_INSTRINFO_HEADER |
| #include "PPCGenInstrInfo.inc" |
| |
| namespace llvm { |
| |
| /// PPCII - This namespace holds all of the PowerPC target-specific |
| /// per-instruction flags. These must match the corresponding definitions in |
| /// PPC.td and PPCInstrFormats.td. |
| namespace PPCII { |
| enum { |
| // PPC970 Instruction Flags. These flags describe the characteristics of the |
| // PowerPC 970 (aka G5) dispatch groups and how they are formed out of |
| // raw machine instructions. |
| |
| /// PPC970_First - This instruction starts a new dispatch group, so it will |
| /// always be the first one in the group. |
| PPC970_First = 0x1, |
| |
| /// PPC970_Single - This instruction starts a new dispatch group and |
| /// terminates it, so it will be the sole instruction in the group. |
| PPC970_Single = 0x2, |
| |
| /// PPC970_Cracked - This instruction is cracked into two pieces, requiring |
| /// two dispatch pipes to be available to issue. |
| PPC970_Cracked = 0x4, |
| |
| /// PPC970_Mask/Shift - This is a bitmask that selects the pipeline type that |
| /// an instruction is issued to. |
| PPC970_Shift = 3, |
| PPC970_Mask = 0x07 << PPC970_Shift |
| }; |
| enum PPC970_Unit { |
| /// These are the various PPC970 execution unit pipelines. Each instruction |
| /// is one of these. |
| PPC970_Pseudo = 0 << PPC970_Shift, // Pseudo instruction |
| PPC970_FXU = 1 << PPC970_Shift, // Fixed Point (aka Integer/ALU) Unit |
| PPC970_LSU = 2 << PPC970_Shift, // Load Store Unit |
| PPC970_FPU = 3 << PPC970_Shift, // Floating Point Unit |
| PPC970_CRU = 4 << PPC970_Shift, // Control Register Unit |
| PPC970_VALU = 5 << PPC970_Shift, // Vector ALU |
| PPC970_VPERM = 6 << PPC970_Shift, // Vector Permute Unit |
| PPC970_BRU = 7 << PPC970_Shift // Branch Unit |
| }; |
| } // end namespace PPCII |
| |
| namespace MachineCombinerPattern { |
| enum MC_PATTERN : int { |
| // These are commutative variants for reassociating a computation chain |
| // of the form: |
| // B = A op X (Prev) |
| // C = B op Y (Root) |
| MC_REASSOC_AX_BY = 0, |
| MC_REASSOC_AX_YB = 1, |
| MC_REASSOC_XA_BY = 2, |
| MC_REASSOC_XA_YB = 3, |
| }; |
| } // end namespace MachineCombinerPattern |
| |
| class PPCSubtarget; |
| class PPCInstrInfo : public PPCGenInstrInfo { |
| PPCSubtarget &Subtarget; |
| const PPCRegisterInfo RI; |
| |
| bool StoreRegToStackSlot(MachineFunction &MF, |
| unsigned SrcReg, bool isKill, int FrameIdx, |
| const TargetRegisterClass *RC, |
| SmallVectorImpl<MachineInstr*> &NewMIs, |
| bool &NonRI, bool &SpillsVRS) const; |
| bool LoadRegFromStackSlot(MachineFunction &MF, DebugLoc DL, |
| unsigned DestReg, int FrameIdx, |
| const TargetRegisterClass *RC, |
| SmallVectorImpl<MachineInstr*> &NewMIs, |
| bool &NonRI, bool &SpillsVRS) const; |
| virtual void anchor(); |
| public: |
| explicit PPCInstrInfo(PPCSubtarget &STI); |
| |
| /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info. As |
| /// such, whenever a client has an instance of instruction info, it should |
| /// always be able to get register info as well (through this method). |
| /// |
| const PPCRegisterInfo &getRegisterInfo() const { return RI; } |
| |
| ScheduleHazardRecognizer * |
| CreateTargetHazardRecognizer(const TargetSubtargetInfo *STI, |
| const ScheduleDAG *DAG) const override; |
| ScheduleHazardRecognizer * |
| CreateTargetPostRAHazardRecognizer(const InstrItineraryData *II, |
| const ScheduleDAG *DAG) const override; |
| |
| unsigned getInstrLatency(const InstrItineraryData *ItinData, |
| const MachineInstr *MI, |
| unsigned *PredCost = nullptr) const override; |
| |
| int getOperandLatency(const InstrItineraryData *ItinData, |
| const MachineInstr *DefMI, unsigned DefIdx, |
| const MachineInstr *UseMI, |
| unsigned UseIdx) const override; |
| int getOperandLatency(const InstrItineraryData *ItinData, |
| SDNode *DefNode, unsigned DefIdx, |
| SDNode *UseNode, unsigned UseIdx) const override { |
| return PPCGenInstrInfo::getOperandLatency(ItinData, DefNode, DefIdx, |
| UseNode, UseIdx); |
| } |
| |
| bool hasLowDefLatency(const TargetSchedModel &SchedModel, |
| const MachineInstr *DefMI, |
| unsigned DefIdx) const override { |
| // Machine LICM should hoist all instructions in low-register-pressure |
| // situations; none are sufficiently free to justify leaving in a loop |
| // body. |
| return false; |
| } |
| |
| bool useMachineCombiner() const override { |
| return true; |
| } |
| |
| /// Return true when there is potentially a faster code sequence |
| /// for an instruction chain ending in <Root>. All potential patterns are |
| /// output in the <Pattern> array. |
| bool getMachineCombinerPatterns( |
| MachineInstr &Root, |
| SmallVectorImpl<MachineCombinerPattern::MC_PATTERN> &P) const override; |
| |
| /// When getMachineCombinerPatterns() finds a pattern, this function generates |
| /// the instructions that could replace the original code sequence. |
| void genAlternativeCodeSequence( |
| MachineInstr &Root, MachineCombinerPattern::MC_PATTERN P, |
| SmallVectorImpl<MachineInstr *> &InsInstrs, |
| SmallVectorImpl<MachineInstr *> &DelInstrs, |
| DenseMap<unsigned, unsigned> &InstrIdxForVirtReg) const override; |
| |
| bool isCoalescableExtInstr(const MachineInstr &MI, |
| unsigned &SrcReg, unsigned &DstReg, |
| unsigned &SubIdx) const override; |
| unsigned isLoadFromStackSlot(const MachineInstr *MI, |
| int &FrameIndex) const override; |
| unsigned isStoreToStackSlot(const MachineInstr *MI, |
| int &FrameIndex) const override; |
| |
| // commuteInstruction - We can commute rlwimi instructions, but only if the |
| // rotate amt is zero. We also have to munge the immediates a bit. |
| MachineInstr *commuteInstruction(MachineInstr *MI, bool NewMI) const override; |
| |
| bool findCommutedOpIndices(MachineInstr *MI, unsigned &SrcOpIdx1, |
| unsigned &SrcOpIdx2) const override; |
| |
| void insertNoop(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MI) const override; |
| |
| |
| // Branch analysis. |
| bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB, |
| MachineBasicBlock *&FBB, |
| SmallVectorImpl<MachineOperand> &Cond, |
| bool AllowModify) const override; |
| unsigned RemoveBranch(MachineBasicBlock &MBB) const override; |
| unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB, |
| MachineBasicBlock *FBB, ArrayRef<MachineOperand> Cond, |
| DebugLoc DL) const override; |
| |
| // Select analysis. |
| bool canInsertSelect(const MachineBasicBlock &, ArrayRef<MachineOperand> Cond, |
| unsigned, unsigned, int &, int &, int &) const override; |
| void insertSelect(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, |
| DebugLoc DL, unsigned DstReg, ArrayRef<MachineOperand> Cond, |
| unsigned TrueReg, unsigned FalseReg) const override; |
| |
| void copyPhysReg(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator I, DebugLoc DL, |
| unsigned DestReg, unsigned SrcReg, |
| bool KillSrc) const override; |
| |
| void storeRegToStackSlot(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MBBI, |
| unsigned SrcReg, bool isKill, int FrameIndex, |
| const TargetRegisterClass *RC, |
| const TargetRegisterInfo *TRI) const override; |
| |
| void loadRegFromStackSlot(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MBBI, |
| unsigned DestReg, int FrameIndex, |
| const TargetRegisterClass *RC, |
| const TargetRegisterInfo *TRI) const override; |
| |
| bool |
| ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const override; |
| |
| bool FoldImmediate(MachineInstr *UseMI, MachineInstr *DefMI, |
| unsigned Reg, MachineRegisterInfo *MRI) const override; |
| |
| // If conversion by predication (only supported by some branch instructions). |
| // All of the profitability checks always return true; it is always |
| // profitable to use the predicated branches. |
| bool isProfitableToIfCvt(MachineBasicBlock &MBB, |
| unsigned NumCycles, unsigned ExtraPredCycles, |
| const BranchProbability &Probability) const override { |
| return true; |
| } |
| |
| bool isProfitableToIfCvt(MachineBasicBlock &TMBB, |
| unsigned NumT, unsigned ExtraT, |
| MachineBasicBlock &FMBB, |
| unsigned NumF, unsigned ExtraF, |
| const BranchProbability &Probability) const override; |
| |
| bool isProfitableToDupForIfCvt(MachineBasicBlock &MBB, |
| unsigned NumCycles, |
| const BranchProbability |
| &Probability) const override { |
| return true; |
| } |
| |
| bool isProfitableToUnpredicate(MachineBasicBlock &TMBB, |
| MachineBasicBlock &FMBB) const override { |
| return false; |
| } |
| |
| // Predication support. |
| bool isPredicated(const MachineInstr *MI) const override; |
| |
| bool isUnpredicatedTerminator(const MachineInstr *MI) const override; |
| |
| bool PredicateInstruction(MachineInstr *MI, |
| ArrayRef<MachineOperand> Pred) const override; |
| |
| bool SubsumesPredicate(ArrayRef<MachineOperand> Pred1, |
| ArrayRef<MachineOperand> Pred2) const override; |
| |
| bool DefinesPredicate(MachineInstr *MI, |
| std::vector<MachineOperand> &Pred) const override; |
| |
| bool isPredicable(MachineInstr *MI) const override; |
| |
| // Comparison optimization. |
| |
| |
| bool analyzeCompare(const MachineInstr *MI, |
| unsigned &SrcReg, unsigned &SrcReg2, |
| int &Mask, int &Value) const override; |
| |
| bool optimizeCompareInstr(MachineInstr *CmpInstr, |
| unsigned SrcReg, unsigned SrcReg2, |
| int Mask, int Value, |
| const MachineRegisterInfo *MRI) const override; |
| |
| /// GetInstSize - Return the number of bytes of code the specified |
| /// instruction may be. This returns the maximum number of bytes. |
| /// |
| unsigned GetInstSizeInBytes(const MachineInstr *MI) const; |
| |
| void getNoopForMachoTarget(MCInst &NopInst) const override; |
| }; |
| |
| } |
| |
| #endif |