LCOV - code coverage report
Current view: top level - include/llvm/CodeGen - MachineInstrBuilder.h (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 126 134 94.0 %
Date: 2017-09-14 15:23:50 Functions: 12 12 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===- CodeGen/MachineInstrBuilder.h - Simplify creation of MIs --*- 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             : // This file exposes a function named BuildMI, which is useful for dramatically
      11             : // simplifying how MachineInstr's are created.  It allows use of code like this:
      12             : //
      13             : //   M = BuildMI(MBB, MI, DL, TII.get(X86::ADD8rr), Dst)
      14             : //           .addReg(argVal1)
      15             : //           .addReg(argVal2);
      16             : //
      17             : //===----------------------------------------------------------------------===//
      18             : 
      19             : #ifndef LLVM_CODEGEN_MACHINEINSTRBUILDER_H
      20             : #define LLVM_CODEGEN_MACHINEINSTRBUILDER_H
      21             : 
      22             : #include "llvm/ADT/ArrayRef.h"
      23             : #include "llvm/CodeGen/MachineBasicBlock.h"
      24             : #include "llvm/CodeGen/MachineFunction.h"
      25             : #include "llvm/CodeGen/MachineInstr.h"
      26             : #include "llvm/CodeGen/MachineInstrBundle.h"
      27             : #include "llvm/CodeGen/MachineOperand.h"
      28             : #include "llvm/IR/InstrTypes.h"
      29             : #include "llvm/IR/Intrinsics.h"
      30             : #include "llvm/Support/ErrorHandling.h"
      31             : #include <cassert>
      32             : #include <cstdint>
      33             : #include <utility>
      34             : 
      35             : namespace llvm {
      36             : 
      37             : class MCInstrDesc;
      38             : class MDNode;
      39             : 
      40             : namespace RegState {
      41             : 
      42             :   enum {
      43             :     Define         = 0x2,
      44             :     Implicit       = 0x4,
      45             :     Kill           = 0x8,
      46             :     Dead           = 0x10,
      47             :     Undef          = 0x20,
      48             :     EarlyClobber   = 0x40,
      49             :     Debug          = 0x80,
      50             :     InternalRead   = 0x100,
      51             :     DefineNoRead   = Define | Undef,
      52             :     ImplicitDefine = Implicit | Define,
      53             :     ImplicitKill   = Implicit | Kill
      54             :   };
      55             : 
      56             : } // end namespace RegState
      57             : 
      58             : class MachineInstrBuilder {
      59             :   MachineFunction *MF = nullptr;
      60             :   MachineInstr *MI = nullptr;
      61             : 
      62             : public:
      63             :   MachineInstrBuilder() = default;
      64             : 
      65             :   /// Create a MachineInstrBuilder for manipulating an existing instruction.
      66             :   /// F must be the machine function that was used to allocate I.
      67     2292357 :   MachineInstrBuilder(MachineFunction &F, MachineInstr *I) : MF(&F), MI(I) {}
      68             :   MachineInstrBuilder(MachineFunction &F, MachineBasicBlock::iterator I)
      69      955438 :       : MF(&F), MI(&*I) {}
      70             : 
      71             :   /// Allow automatic conversion to the machine instruction we are working on.
      72             :   operator MachineInstr*() const { return MI; }
      73             :   MachineInstr *operator->() const { return MI; }
      74      127026 :   operator MachineBasicBlock::iterator() const { return MI; }
      75             : 
      76             :   /// If conversion operators fail, use this method to get the MachineInstr
      77             :   /// explicitly.
      78             :   MachineInstr *getInstr() const { return MI; }
      79             : 
      80             :   /// Add a new virtual register operand.
      81    11313418 :   const MachineInstrBuilder &addReg(unsigned RegNo, unsigned flags = 0,
      82             :                                     unsigned SubReg = 0) const {
      83             :     assert((flags & 0x1) == 0 &&
      84             :            "Passing in 'true' to addReg is forbidden! Use enums instead.");
      85    22626836 :     MI->addOperand(*MF, MachineOperand::CreateReg(RegNo,
      86    11313418 :                                                flags & RegState::Define,
      87    11313418 :                                                flags & RegState::Implicit,
      88    11313418 :                                                flags & RegState::Kill,
      89    11313418 :                                                flags & RegState::Dead,
      90    11313418 :                                                flags & RegState::Undef,
      91    11313418 :                                                flags & RegState::EarlyClobber,
      92             :                                                SubReg,
      93    11313418 :                                                flags & RegState::Debug,
      94    90507344 :                                                flags & RegState::InternalRead));
      95    11313418 :     return *this;
      96             :   }
      97             : 
      98             :   /// Add a virtual register definition operand.
      99             :   const MachineInstrBuilder &addDef(unsigned RegNo, unsigned Flags = 0,
     100             :                                     unsigned SubReg = 0) const {
     101        8314 :     return addReg(RegNo, Flags | RegState::Define, SubReg);
     102             :   }
     103             : 
     104             :   /// Add a virtual register use operand. It is an error for Flags to contain
     105             :   /// `RegState::Define` when calling this function.
     106             :   const MachineInstrBuilder &addUse(unsigned RegNo, unsigned Flags = 0,
     107             :                                     unsigned SubReg = 0) const {
     108             :     assert(!(Flags & RegState::Define) &&
     109             :            "Misleading addUse defines register, use addReg instead.");
     110       10358 :     return addReg(RegNo, Flags, SubReg);
     111             :   }
     112             : 
     113             :   /// Add a new immediate operand.
     114             :   const MachineInstrBuilder &addImm(int64_t Val) const {
     115     9548973 :     MI->addOperand(*MF, MachineOperand::CreateImm(Val));
     116             :     return *this;
     117             :   }
     118             : 
     119             :   const MachineInstrBuilder &addCImm(const ConstantInt *Val) const {
     120        1154 :     MI->addOperand(*MF, MachineOperand::CreateCImm(Val));
     121             :     return *this;
     122             :   }
     123             : 
     124             :   const MachineInstrBuilder &addFPImm(const ConstantFP *Val) const {
     125         304 :     MI->addOperand(*MF, MachineOperand::CreateFPImm(Val));
     126             :     return *this;
     127             :   }
     128             : 
     129             :   const MachineInstrBuilder &addMBB(MachineBasicBlock *MBB,
     130             :                                     unsigned char TargetFlags = 0) const {
     131     1265292 :     MI->addOperand(*MF, MachineOperand::CreateMBB(MBB, TargetFlags));
     132             :     return *this;
     133             :   }
     134             : 
     135             :   const MachineInstrBuilder &addFrameIndex(int Idx) const {
     136      524014 :     MI->addOperand(*MF, MachineOperand::CreateFI(Idx));
     137             :     return *this;
     138             :   }
     139             : 
     140             :   const MachineInstrBuilder &addConstantPoolIndex(unsigned Idx,
     141             :                                                   int Offset = 0,
     142             :                                           unsigned char TargetFlags = 0) const {
     143       46824 :     MI->addOperand(*MF, MachineOperand::CreateCPI(Idx, Offset, TargetFlags));
     144             :     return *this;
     145             :   }
     146             : 
     147             :   const MachineInstrBuilder &addTargetIndex(unsigned Idx, int64_t Offset = 0,
     148             :                                           unsigned char TargetFlags = 0) const {
     149           0 :     MI->addOperand(*MF, MachineOperand::CreateTargetIndex(Idx, Offset,
     150           0 :                                                           TargetFlags));
     151             :     return *this;
     152             :   }
     153             : 
     154             :   const MachineInstrBuilder &addJumpTableIndex(unsigned Idx,
     155             :                                           unsigned char TargetFlags = 0) const {
     156         886 :     MI->addOperand(*MF, MachineOperand::CreateJTI(Idx, TargetFlags));
     157             :     return *this;
     158             :   }
     159             : 
     160             :   const MachineInstrBuilder &addGlobalAddress(const GlobalValue *GV,
     161             :                                               int64_t Offset = 0,
     162             :                                           unsigned char TargetFlags = 0) const {
     163     1557322 :     MI->addOperand(*MF, MachineOperand::CreateGA(GV, Offset, TargetFlags));
     164             :     return *this;
     165             :   }
     166             : 
     167             :   const MachineInstrBuilder &addExternalSymbol(const char *FnName,
     168             :                                           unsigned char TargetFlags = 0) const {
     169       53112 :     MI->addOperand(*MF, MachineOperand::CreateES(FnName, TargetFlags));
     170             :     return *this;
     171             :   }
     172             : 
     173             :   const MachineInstrBuilder &addBlockAddress(const BlockAddress *BA,
     174             :                                              int64_t Offset = 0,
     175             :                                           unsigned char TargetFlags = 0) const {
     176         256 :     MI->addOperand(*MF, MachineOperand::CreateBA(BA, Offset, TargetFlags));
     177             :     return *this;
     178             :   }
     179             : 
     180             :   const MachineInstrBuilder &addRegMask(const uint32_t *Mask) const {
     181      379638 :     MI->addOperand(*MF, MachineOperand::CreateRegMask(Mask));
     182             :     return *this;
     183             :   }
     184             : 
     185             :   const MachineInstrBuilder &addMemOperand(MachineMemOperand *MMO) const {
     186       86176 :     MI->addMemOperand(*MF, MMO);
     187             :     return *this;
     188             :   }
     189             : 
     190             :   const MachineInstrBuilder &setMemRefs(MachineInstr::mmo_iterator b,
     191             :                                         MachineInstr::mmo_iterator e) const {
     192     5402924 :     MI->setMemRefs(b, e);
     193             :     return *this;
     194             :   }
     195             : 
     196             :   const MachineInstrBuilder &setMemRefs(std::pair<MachineInstr::mmo_iterator,
     197             :                                         unsigned> MemOperandsRef) const {
     198        3010 :     MI->setMemRefs(MemOperandsRef);
     199             :     return *this;
     200             :   }
     201             : 
     202             :   const MachineInstrBuilder &add(const MachineOperand &MO) const {
     203      646610 :     MI->addOperand(*MF, MO);
     204             :     return *this;
     205             :   }
     206             : 
     207             :   const MachineInstrBuilder &add(ArrayRef<MachineOperand> MOs) const {
     208      157857 :     for (const MachineOperand &MO : MOs) {
     209      105148 :       MI->addOperand(*MF, MO);
     210             :     }
     211             :     return *this;
     212             :   }
     213             : 
     214             :   const MachineInstrBuilder &addMetadata(const MDNode *MD) const {
     215      225332 :     MI->addOperand(*MF, MachineOperand::CreateMetadata(MD));
     216             :     assert((MI->isDebugValue() ? static_cast<bool>(MI->getDebugVariable())
     217             :                                : true) &&
     218             :            "first MDNode argument of a DBG_VALUE not a variable");
     219             :     return *this;
     220             :   }
     221             : 
     222             :   const MachineInstrBuilder &addCFIIndex(unsigned CFIIndex) const {
     223      460922 :     MI->addOperand(*MF, MachineOperand::CreateCFIIndex(CFIIndex));
     224             :     return *this;
     225             :   }
     226             : 
     227             :   const MachineInstrBuilder &addIntrinsicID(Intrinsic::ID ID) const {
     228          18 :     MI->addOperand(*MF, MachineOperand::CreateIntrinsicID(ID));
     229             :     return *this;
     230             :   }
     231             : 
     232             :   const MachineInstrBuilder &addPredicate(CmpInst::Predicate Pred) const {
     233         210 :     MI->addOperand(*MF, MachineOperand::CreatePredicate(Pred));
     234             :     return *this;
     235             :   }
     236             : 
     237             :   const MachineInstrBuilder &addSym(MCSymbol *Sym,
     238             :                                     unsigned char TargetFlags = 0) const {
     239      150048 :     MI->addOperand(*MF, MachineOperand::CreateMCSymbol(Sym, TargetFlags));
     240             :     return *this;
     241             :   }
     242             : 
     243             :   const MachineInstrBuilder &setMIFlags(unsigned Flags) const {
     244       85466 :     MI->setFlags(Flags);
     245             :     return *this;
     246             :   }
     247             : 
     248             :   const MachineInstrBuilder &setMIFlag(MachineInstr::MIFlag Flag) const {
     249      151964 :     MI->setFlag(Flag);
     250             :     return *this;
     251             :   }
     252             : 
     253             :   // Add a displacement from an existing MachineOperand with an added offset.
     254          39 :   const MachineInstrBuilder &addDisp(const MachineOperand &Disp, int64_t off,
     255             :                                      unsigned char TargetFlags = 0) const {
     256             :     // If caller specifies new TargetFlags then use it, otherwise the
     257             :     // default behavior is to copy the target flags from the existing
     258             :     // MachineOperand. This means if the caller wants to clear the
     259             :     // target flags it needs to do so explicitly.
     260          39 :     if (0 == TargetFlags)
     261          39 :       TargetFlags = Disp.getTargetFlags();
     262             : 
     263          39 :     switch (Disp.getType()) {
     264           0 :       default:
     265           0 :         llvm_unreachable("Unhandled operand type in addDisp()");
     266          18 :       case MachineOperand::MO_Immediate:
     267          36 :         return addImm(Disp.getImm() + off);
     268           6 :       case MachineOperand::MO_ConstantPoolIndex:
     269          18 :         return addConstantPoolIndex(Disp.getIndex(), Disp.getOffset() + off,
     270          18 :                                     TargetFlags);
     271          15 :       case MachineOperand::MO_GlobalAddress:
     272          15 :         return addGlobalAddress(Disp.getGlobal(), Disp.getOffset() + off,
     273          30 :                                 TargetFlags);
     274             :     }
     275             :   }
     276             : 
     277             :   /// Copy all the implicit operands from OtherMI onto this one.
     278             :   const MachineInstrBuilder &
     279             :   copyImplicitOps(const MachineInstr &OtherMI) const {
     280        3885 :     MI->copyImplicitOps(*MF, OtherMI);
     281             :     return *this;
     282             :   }
     283             : };
     284             : 
     285             : /// Builder interface. Specify how to create the initial instruction itself.
     286             : inline MachineInstrBuilder BuildMI(MachineFunction &MF, const DebugLoc &DL,
     287             :                                    const MCInstrDesc &MCID) {
     288     2791080 :   return MachineInstrBuilder(MF, MF.CreateMachineInstr(MCID, DL));
     289             : }
     290             : 
     291             : /// This version of the builder sets up the first operand as a
     292             : /// destination virtual register.
     293      106285 : inline MachineInstrBuilder BuildMI(MachineFunction &MF, const DebugLoc &DL,
     294             :                                    const MCInstrDesc &MCID, unsigned DestReg) {
     295      318855 :   return MachineInstrBuilder(MF, MF.CreateMachineInstr(MCID, DL))
     296      212570 :            .addReg(DestReg, RegState::Define);
     297             : }
     298             : 
     299             : /// This version of the builder inserts the newly-built instruction before
     300             : /// the given position in the given MachineBasicBlock, and sets up the first
     301             : /// operand as a destination virtual register.
     302     2071222 : inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
     303             :                                    MachineBasicBlock::iterator I,
     304             :                                    const DebugLoc &DL, const MCInstrDesc &MCID,
     305             :                                    unsigned DestReg) {
     306     2071222 :   MachineFunction &MF = *BB.getParent();
     307     2071222 :   MachineInstr *MI = MF.CreateMachineInstr(MCID, DL);
     308     2071222 :   BB.insert(I, MI);
     309     2071222 :   return MachineInstrBuilder(MF, MI).addReg(DestReg, RegState::Define);
     310             : }
     311             : 
     312             : /// This version of the builder inserts the newly-built instruction before
     313             : /// the given position in the given MachineBasicBlock, and sets up the first
     314             : /// operand as a destination virtual register.
     315             : ///
     316             : /// If \c I is inside a bundle, then the newly inserted \a MachineInstr is
     317             : /// added to the same bundle.
     318        8297 : inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
     319             :                                    MachineBasicBlock::instr_iterator I,
     320             :                                    const DebugLoc &DL, const MCInstrDesc &MCID,
     321             :                                    unsigned DestReg) {
     322        8297 :   MachineFunction &MF = *BB.getParent();
     323        8297 :   MachineInstr *MI = MF.CreateMachineInstr(MCID, DL);
     324        8297 :   BB.insert(I, MI);
     325        8297 :   return MachineInstrBuilder(MF, MI).addReg(DestReg, RegState::Define);
     326             : }
     327             : 
     328      272359 : inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB, MachineInstr &I,
     329             :                                    const DebugLoc &DL, const MCInstrDesc &MCID,
     330             :                                    unsigned DestReg) {
     331             :   // Calling the overload for instr_iterator is always correct.  However, the
     332             :   // definition is not available in headers, so inline the check.
     333      272359 :   if (I.isInsideBundle())
     334           0 :     return BuildMI(BB, MachineBasicBlock::instr_iterator(I), DL, MCID, DestReg);
     335      272359 :   return BuildMI(BB, MachineBasicBlock::iterator(I), DL, MCID, DestReg);
     336             : }
     337             : 
     338             : inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB, MachineInstr *I,
     339             :                                    const DebugLoc &DL, const MCInstrDesc &MCID,
     340             :                                    unsigned DestReg) {
     341      263849 :   return BuildMI(BB, *I, DL, MCID, DestReg);
     342             : }
     343             : 
     344             : /// This version of the builder inserts the newly-built instruction before the
     345             : /// given position in the given MachineBasicBlock, and does NOT take a
     346             : /// destination register.
     347     1273156 : inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
     348             :                                    MachineBasicBlock::iterator I,
     349             :                                    const DebugLoc &DL,
     350             :                                    const MCInstrDesc &MCID) {
     351     1273156 :   MachineFunction &MF = *BB.getParent();
     352     1273156 :   MachineInstr *MI = MF.CreateMachineInstr(MCID, DL);
     353     1273156 :   BB.insert(I, MI);
     354     1273156 :   return MachineInstrBuilder(MF, MI);
     355             : }
     356             : 
     357         745 : inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
     358             :                                    MachineBasicBlock::instr_iterator I,
     359             :                                    const DebugLoc &DL,
     360             :                                    const MCInstrDesc &MCID) {
     361         745 :   MachineFunction &MF = *BB.getParent();
     362         745 :   MachineInstr *MI = MF.CreateMachineInstr(MCID, DL);
     363         745 :   BB.insert(I, MI);
     364         745 :   return MachineInstrBuilder(MF, MI);
     365             : }
     366             : 
     367      231593 : inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB, MachineInstr &I,
     368             :                                    const DebugLoc &DL,
     369             :                                    const MCInstrDesc &MCID) {
     370             :   // Calling the overload for instr_iterator is always correct.  However, the
     371             :   // definition is not available in headers, so inline the check.
     372      231593 :   if (I.isInsideBundle())
     373         502 :     return BuildMI(BB, MachineBasicBlock::instr_iterator(I), DL, MCID);
     374      231091 :   return BuildMI(BB, MachineBasicBlock::iterator(I), DL, MCID);
     375             : }
     376             : 
     377             : inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB, MachineInstr *I,
     378             :                                    const DebugLoc &DL,
     379             :                                    const MCInstrDesc &MCID) {
     380      100323 :   return BuildMI(BB, *I, DL, MCID);
     381             : }
     382             : 
     383             : /// This version of the builder inserts the newly-built instruction at the end
     384             : /// of the given MachineBasicBlock, and does NOT take a destination register.
     385             : inline MachineInstrBuilder BuildMI(MachineBasicBlock *BB, const DebugLoc &DL,
     386             :                                    const MCInstrDesc &MCID) {
     387      399946 :   return BuildMI(*BB, BB->end(), DL, MCID);
     388             : }
     389             : 
     390             : /// This version of the builder inserts the newly-built instruction at the
     391             : /// end of the given MachineBasicBlock, and sets up the first operand as a
     392             : /// destination virtual register.
     393             : inline MachineInstrBuilder BuildMI(MachineBasicBlock *BB, const DebugLoc &DL,
     394             :                                    const MCInstrDesc &MCID, unsigned DestReg) {
     395       47748 :   return BuildMI(*BB, BB->end(), DL, MCID, DestReg);
     396             : }
     397             : 
     398             : /// This version of the builder builds a DBG_VALUE intrinsic
     399             : /// for either a value in a register or a register-indirect
     400             : /// address.  The convention is that a DBG_VALUE is indirect iff the
     401             : /// second operand is an immediate.
     402             : MachineInstrBuilder BuildMI(MachineFunction &MF, const DebugLoc &DL,
     403             :                             const MCInstrDesc &MCID, bool IsIndirect,
     404             :                             unsigned Reg, const MDNode *Variable,
     405             :                             const MDNode *Expr);
     406             : 
     407             : /// This version of the builder builds a DBG_VALUE intrinsic
     408             : /// for either a value in a register or a register-indirect
     409             : /// address and inserts it at position I.
     410             : MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
     411             :                             MachineBasicBlock::iterator I, const DebugLoc &DL,
     412             :                             const MCInstrDesc &MCID, bool IsIndirect,
     413             :                             unsigned Reg, const MDNode *Variable,
     414             :                             const MDNode *Expr);
     415             : 
     416             : /// Clone a DBG_VALUE whose value has been spilled to FrameIndex.
     417             : MachineInstr *buildDbgValueForSpill(MachineBasicBlock &BB,
     418             :                                     MachineBasicBlock::iterator I,
     419             :                                     const MachineInstr &Orig, int FrameIndex);
     420             : 
     421             : inline unsigned getDefRegState(bool B) {
     422     1892687 :   return B ? RegState::Define : 0;
     423             : }
     424             : inline unsigned getImplRegState(bool B) {
     425       52714 :   return B ? RegState::Implicit : 0;
     426             : }
     427             : inline unsigned getKillRegState(bool B) {
     428     2236147 :   return B ? RegState::Kill : 0;
     429             : }
     430             : inline unsigned getDeadRegState(bool B) {
     431        5108 :   return B ? RegState::Dead : 0;
     432             : }
     433             : inline unsigned getUndefRegState(bool B) {
     434       94395 :   return B ? RegState::Undef : 0;
     435             : }
     436             : inline unsigned getInternalReadRegState(bool B) {
     437        1678 :   return B ? RegState::InternalRead : 0;
     438             : }
     439             : inline unsigned getDebugRegState(bool B) {
     440     1879034 :   return B ? RegState::Debug : 0;
     441             : }
     442             : 
     443             : /// Get all register state flags from machine operand \p RegOp.
     444        1578 : inline unsigned getRegState(const MachineOperand &RegOp) {
     445             :   assert(RegOp.isReg() && "Not a register operand");
     446        4734 :   return getDefRegState(RegOp.isDef())                    |
     447        4734 :          getImplRegState(RegOp.isImplicit())              |
     448        4734 :          getKillRegState(RegOp.isKill())                  |
     449        4734 :          getDeadRegState(RegOp.isDead())                  |
     450        4734 :          getUndefRegState(RegOp.isUndef())                |
     451        3156 :          getInternalReadRegState(RegOp.isInternalRead())  |
     452        3156 :          getDebugRegState(RegOp.isDebug());
     453             : }
     454             : 
     455             : /// Helper class for constructing bundles of MachineInstrs.
     456             : ///
     457             : /// MIBundleBuilder can create a bundle from scratch by inserting new
     458             : /// MachineInstrs one at a time, or it can create a bundle from a sequence of
     459             : /// existing MachineInstrs in a basic block.
     460             : class MIBundleBuilder {
     461             :   MachineBasicBlock &MBB;
     462             :   MachineBasicBlock::instr_iterator Begin;
     463             :   MachineBasicBlock::instr_iterator End;
     464             : 
     465             : public:
     466             :   /// Create an MIBundleBuilder that inserts instructions into a new bundle in
     467             :   /// BB above the bundle or instruction at Pos.
     468             :   MIBundleBuilder(MachineBasicBlock &BB, MachineBasicBlock::iterator Pos)
     469         487 :       : MBB(BB), Begin(Pos.getInstrIterator()), End(Begin) {}
     470             : 
     471             :   /// Create a bundle from the sequence of instructions between B and E.
     472       32887 :   MIBundleBuilder(MachineBasicBlock &BB, MachineBasicBlock::iterator B,
     473             :                   MachineBasicBlock::iterator E)
     474       98661 :       : MBB(BB), Begin(B.getInstrIterator()), End(E.getInstrIterator()) {
     475             :     assert(B != E && "No instructions to bundle");
     476             :     ++B;
     477      120843 :     while (B != E) {
     478       43978 :       MachineInstr &MI = *B;
     479       43978 :       ++B;
     480       43978 :       MI.bundleWithPred();
     481             :     }
     482       32887 :   }
     483             : 
     484             :   /// Create an MIBundleBuilder representing an existing instruction or bundle
     485             :   /// that has MI as its head.
     486             :   explicit MIBundleBuilder(MachineInstr *MI)
     487          49 :       : MBB(*MI->getParent()), Begin(MI),
     488         196 :         End(getBundleEnd(MI->getIterator())) {}
     489             : 
     490             :   /// Return a reference to the basic block containing this bundle.
     491             :   MachineBasicBlock &getMBB() const { return MBB; }
     492             : 
     493             :   /// Return true if no instructions have been inserted in this bundle yet.
     494             :   /// Empty bundles aren't representable in a MachineBasicBlock.
     495       37560 :   bool empty() const { return Begin == End; }
     496             : 
     497             :   /// Return an iterator to the first bundled instruction.
     498             :   MachineBasicBlock::instr_iterator begin() const { return Begin; }
     499             : 
     500             :   /// Return an iterator beyond the last bundled instruction.
     501             :   MachineBasicBlock::instr_iterator end() const { return End; }
     502             : 
     503             :   /// Insert MI into this bundle before I which must point to an instruction in
     504             :   /// the bundle, or end().
     505       19796 :   MIBundleBuilder &insert(MachineBasicBlock::instr_iterator I,
     506             :                           MachineInstr *MI) {
     507       19796 :     MBB.insert(I, MI);
     508       39592 :     if (I == Begin) {
     509       18780 :       if (!empty())
     510       18293 :         MI->bundleWithSucc();
     511       37560 :       Begin = MI->getIterator();
     512       18780 :       return *this;
     513             :     }
     514        2032 :     if (I == End) {
     515        1016 :       MI->bundleWithPred();
     516        1016 :       return *this;
     517             :     }
     518             :     // MI was inserted in the middle of the bundle, so its neighbors' flags are
     519             :     // already fine. Update MI's bundle flags manually.
     520           0 :     MI->setFlag(MachineInstr::BundledPred);
     521           0 :     MI->setFlag(MachineInstr::BundledSucc);
     522           0 :     return *this;
     523             :   }
     524             : 
     525             :   /// Insert MI into MBB by prepending it to the instructions in the bundle.
     526             :   /// MI will become the first instruction in the bundle.
     527             :   MIBundleBuilder &prepend(MachineInstr *MI) {
     528       18293 :     return insert(begin(), MI);
     529             :   }
     530             : 
     531             :   /// Insert MI into MBB by appending it to the instructions in the bundle.
     532             :   /// MI will become the last instruction in the bundle.
     533             :   MIBundleBuilder &append(MachineInstr *MI) {
     534        1503 :     return insert(end(), MI);
     535             :   }
     536             : };
     537             : 
     538             : } // end namespace llvm
     539             : 
     540             : #endif // LLVM_CODEGEN_MACHINEINSTRBUILDER_H

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