X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FVirtRegMap.h;h=7974dda66a5f9a0ab4aa5081036080e3a95a0df9;hb=3e2d76c946ba753c2b11af192a52e25b6f9b46ff;hp=87a9b2a7c46f9b31e5eaf0dae3f41520f859721a;hpb=f0179004e94259a8adab6c48f295ea9ab18af4c3;p=oota-llvm.git diff --git a/lib/CodeGen/VirtRegMap.h b/lib/CodeGen/VirtRegMap.h index 87a9b2a7c46..7974dda66a5 100644 --- a/lib/CodeGen/VirtRegMap.h +++ b/lib/CodeGen/VirtRegMap.h @@ -18,23 +18,16 @@ #define LLVM_CODEGEN_VIRTREGMAP_H #include "llvm/CodeGen/MachineFunctionPass.h" -#include "llvm/CodeGen/LiveInterval.h" #include "llvm/Target/TargetRegisterInfo.h" -#include "llvm/ADT/BitVector.h" -#include "llvm/ADT/DenseMap.h" #include "llvm/ADT/IndexedMap.h" -#include "llvm/ADT/SmallPtrSet.h" -#include "llvm/ADT/SmallVector.h" -#include namespace llvm { - class LiveIntervals; class MachineInstr; class MachineFunction; class MachineRegisterInfo; class TargetInstrInfo; - class TargetRegisterInfo; class raw_ostream; + class SlotIndexes; class VirtRegMap : public MachineFunctionPass { public: @@ -44,18 +37,12 @@ namespace llvm { MAX_STACK_SLOT = (1L << 18)-1 }; - enum ModRef { isRef = 1, isMod = 2, isModRef = 3 }; - typedef std::multimap > MI2VirtMapTy; - private: MachineRegisterInfo *MRI; const TargetInstrInfo *TII; const TargetRegisterInfo *TRI; MachineFunction *MF; - DenseMap allocatableRCRegs; - /// Virt2PhysMap - This is a virtual to physical register /// mapping. Each virtual register is required to have an entry in /// it; even spilled virtual registers (the register mapped to a @@ -69,82 +56,20 @@ namespace llvm { /// at. IndexedMap Virt2StackSlotMap; - /// Virt2ReMatIdMap - This is virtual register to rematerialization id - /// mapping. Each spilled virtual register that should be remat'd has an - /// entry in it which corresponds to the remat id. - IndexedMap Virt2ReMatIdMap; - /// Virt2SplitMap - This is virtual register to splitted virtual register /// mapping. IndexedMap Virt2SplitMap; - /// Virt2SplitKillMap - This is splitted virtual register to its last use - /// (kill) index mapping. - IndexedMap Virt2SplitKillMap; - - /// ReMatMap - This is virtual register to re-materialized instruction - /// mapping. Each virtual register whose definition is going to be - /// re-materialized has an entry in it. - IndexedMap ReMatMap; - - /// MI2VirtMap - This is MachineInstr to virtual register - /// mapping. In the case of memory spill code being folded into - /// instructions, we need to know which virtual register was - /// read/written by this instruction. - MI2VirtMapTy MI2VirtMap; - - /// SpillPt2VirtMap - This records the virtual registers which should - /// be spilled right after the MachineInstr due to live interval - /// splitting. - std::map > > - SpillPt2VirtMap; - - /// RestorePt2VirtMap - This records the virtual registers which should - /// be restored right before the MachineInstr due to live interval - /// splitting. - std::map > RestorePt2VirtMap; - - /// EmergencySpillMap - This records the physical registers that should - /// be spilled / restored around the MachineInstr since the register - /// allocator has run out of registers. - std::map > EmergencySpillMap; - - /// EmergencySpillSlots - This records emergency spill slots used to - /// spill physical registers when the register allocator runs out of - /// registers. Ideally only one stack slot is used per function per - /// register class. - std::map EmergencySpillSlots; - - /// ReMatId - Instead of assigning a stack slot to a to be rematerialized - /// virtual register, an unique id is being assigned. This keeps track of - /// the highest id used so far. Note, this starts at (1<<18) to avoid - /// conflicts with stack slot numbers. - int ReMatId; - - /// LowSpillSlot, HighSpillSlot - Lowest and highest spill slot indexes. - int LowSpillSlot, HighSpillSlot; + /// createSpillSlot - Allocate a spill slot for RC from MFI. + unsigned createSpillSlot(const TargetRegisterClass *RC); - /// SpillSlotToUsesMap - Records uses for each register spill slot. - SmallVector, 8> SpillSlotToUsesMap; - - /// ImplicitDefed - One bit for each virtual register. If set it indicates - /// the register is implicitly defined. - BitVector ImplicitDefed; - - /// UnusedRegs - A list of physical registers that have not been used. - BitVector UnusedRegs; - - VirtRegMap(const VirtRegMap&); // DO NOT IMPLEMENT - void operator=(const VirtRegMap&); // DO NOT IMPLEMENT + VirtRegMap(const VirtRegMap&) LLVM_DELETED_FUNCTION; + void operator=(const VirtRegMap&) LLVM_DELETED_FUNCTION; public: static char ID; - VirtRegMap() : MachineFunctionPass(&ID), Virt2PhysMap(NO_PHYS_REG), - Virt2StackSlotMap(NO_STACK_SLOT), - Virt2ReMatIdMap(NO_STACK_SLOT), Virt2SplitMap(0), - Virt2SplitKillMap(SlotIndex()), ReMatMap(NULL), - ReMatId(MAX_STACK_SLOT+1), - LowSpillSlot(NO_STACK_SLOT), HighSpillSlot(NO_STACK_SLOT) { } + VirtRegMap() : MachineFunctionPass(ID), Virt2PhysMap(NO_PHYS_REG), + Virt2StackSlotMap(NO_STACK_SLOT), Virt2SplitMap(0) { } virtual bool runOnMachineFunction(MachineFunction &MF); virtual void getAnalysisUsage(AnalysisUsage &AU) const { @@ -153,10 +78,13 @@ namespace llvm { } MachineFunction &getMachineFunction() const { - assert(MF && "getMachineFunction called before runOnMAchineFunction"); + assert(MF && "getMachineFunction called before runOnMachineFunction"); return *MF; } + MachineRegisterInfo &getRegInfo() const { return *MRI; } + const TargetRegisterInfo &getTargetRegInfo() const { return *TRI; } + void grow(); /// @brief returns true if the specified virtual register is @@ -201,21 +129,34 @@ namespace llvm { /// @brief returns the register allocation preference. unsigned getRegAllocPref(unsigned virtReg); + /// @brief returns true if VirtReg is assigned to its preferred physreg. + bool hasPreferredPhys(unsigned VirtReg) { + return getPhys(VirtReg) == getRegAllocPref(VirtReg); + } + /// @brief records virtReg is a split live interval from SReg. void setIsSplitFromReg(unsigned virtReg, unsigned SReg) { Virt2SplitMap[virtReg] = SReg; } /// @brief returns the live interval virtReg is split from. - unsigned getPreSplitReg(unsigned virtReg) { + unsigned getPreSplitReg(unsigned virtReg) const { return Virt2SplitMap[virtReg]; } + /// getOriginal - Return the original virtual register that VirtReg descends + /// from through splitting. + /// A register that was not created by splitting is its own original. + /// This operation is idempotent. + unsigned getOriginal(unsigned VirtReg) const { + unsigned Orig = getPreSplitReg(VirtReg); + return Orig ? Orig : VirtReg; + } + /// @brief returns true if the specified virtual register is not /// mapped to a stack slot or rematerialized. bool isAssignedReg(unsigned virtReg) const { - if (getStackSlot(virtReg) == NO_STACK_SLOT && - getReMatId(virtReg) == NO_STACK_SLOT) + if (getStackSlot(virtReg) == NO_STACK_SLOT) return true; // Split register can be assigned a physical register as well as a // stack slot or remat id. @@ -229,13 +170,6 @@ namespace llvm { return Virt2StackSlotMap[virtReg]; } - /// @brief returns the rematerialization id mapped to the specified virtual - /// register - int getReMatId(unsigned virtReg) const { - assert(TargetRegisterInfo::isVirtualRegister(virtReg)); - return Virt2ReMatIdMap[virtReg]; - } - /// @brief create a mapping for the specifed virtual register to /// the next available stack slot int assignVirt2StackSlot(unsigned virtReg); @@ -243,250 +177,6 @@ namespace llvm { /// the specified stack slot void assignVirt2StackSlot(unsigned virtReg, int frameIndex); - /// @brief assign an unique re-materialization id to the specified - /// virtual register. - int assignVirtReMatId(unsigned virtReg); - /// @brief assign an unique re-materialization id to the specified - /// virtual register. - void assignVirtReMatId(unsigned virtReg, int id); - - /// @brief returns true if the specified virtual register is being - /// re-materialized. - bool isReMaterialized(unsigned virtReg) const { - return ReMatMap[virtReg] != NULL; - } - - /// @brief returns the original machine instruction being re-issued - /// to re-materialize the specified virtual register. - MachineInstr *getReMaterializedMI(unsigned virtReg) const { - return ReMatMap[virtReg]; - } - - /// @brief records the specified virtual register will be - /// re-materialized and the original instruction which will be re-issed - /// for this purpose. If parameter all is true, then all uses of the - /// registers are rematerialized and it's safe to delete the definition. - void setVirtIsReMaterialized(unsigned virtReg, MachineInstr *def) { - ReMatMap[virtReg] = def; - } - - /// @brief record the last use (kill) of a split virtual register. - void addKillPoint(unsigned virtReg, SlotIndex index) { - Virt2SplitKillMap[virtReg] = index; - } - - SlotIndex getKillPoint(unsigned virtReg) const { - return Virt2SplitKillMap[virtReg]; - } - - /// @brief remove the last use (kill) of a split virtual register. - void removeKillPoint(unsigned virtReg) { - Virt2SplitKillMap[virtReg] = SlotIndex(); - } - - /// @brief returns true if the specified MachineInstr is a spill point. - bool isSpillPt(MachineInstr *Pt) const { - return SpillPt2VirtMap.find(Pt) != SpillPt2VirtMap.end(); - } - - /// @brief returns the virtual registers that should be spilled due to - /// splitting right after the specified MachineInstr. - std::vector > &getSpillPtSpills(MachineInstr *Pt) { - return SpillPt2VirtMap[Pt]; - } - - /// @brief records the specified MachineInstr as a spill point for virtReg. - void addSpillPoint(unsigned virtReg, bool isKill, MachineInstr *Pt) { - std::map > >::iterator - I = SpillPt2VirtMap.find(Pt); - if (I != SpillPt2VirtMap.end()) - I->second.push_back(std::make_pair(virtReg, isKill)); - else { - std::vector > Virts; - Virts.push_back(std::make_pair(virtReg, isKill)); - SpillPt2VirtMap.insert(std::make_pair(Pt, Virts)); - } - } - - /// @brief - transfer spill point information from one instruction to - /// another. - void transferSpillPts(MachineInstr *Old, MachineInstr *New) { - std::map > >::iterator - I = SpillPt2VirtMap.find(Old); - if (I == SpillPt2VirtMap.end()) - return; - while (!I->second.empty()) { - unsigned virtReg = I->second.back().first; - bool isKill = I->second.back().second; - I->second.pop_back(); - addSpillPoint(virtReg, isKill, New); - } - SpillPt2VirtMap.erase(I); - } - - /// @brief returns true if the specified MachineInstr is a restore point. - bool isRestorePt(MachineInstr *Pt) const { - return RestorePt2VirtMap.find(Pt) != RestorePt2VirtMap.end(); - } - - /// @brief returns the virtual registers that should be restoreed due to - /// splitting right after the specified MachineInstr. - std::vector &getRestorePtRestores(MachineInstr *Pt) { - return RestorePt2VirtMap[Pt]; - } - - /// @brief records the specified MachineInstr as a restore point for virtReg. - void addRestorePoint(unsigned virtReg, MachineInstr *Pt) { - std::map >::iterator I = - RestorePt2VirtMap.find(Pt); - if (I != RestorePt2VirtMap.end()) - I->second.push_back(virtReg); - else { - std::vector Virts; - Virts.push_back(virtReg); - RestorePt2VirtMap.insert(std::make_pair(Pt, Virts)); - } - } - - /// @brief - transfer restore point information from one instruction to - /// another. - void transferRestorePts(MachineInstr *Old, MachineInstr *New) { - std::map >::iterator I = - RestorePt2VirtMap.find(Old); - if (I == RestorePt2VirtMap.end()) - return; - while (!I->second.empty()) { - unsigned virtReg = I->second.back(); - I->second.pop_back(); - addRestorePoint(virtReg, New); - } - RestorePt2VirtMap.erase(I); - } - - /// @brief records that the specified physical register must be spilled - /// around the specified machine instr. - void addEmergencySpill(unsigned PhysReg, MachineInstr *MI) { - if (EmergencySpillMap.find(MI) != EmergencySpillMap.end()) - EmergencySpillMap[MI].push_back(PhysReg); - else { - std::vector PhysRegs; - PhysRegs.push_back(PhysReg); - EmergencySpillMap.insert(std::make_pair(MI, PhysRegs)); - } - } - - /// @brief returns true if one or more physical registers must be spilled - /// around the specified instruction. - bool hasEmergencySpills(MachineInstr *MI) const { - return EmergencySpillMap.find(MI) != EmergencySpillMap.end(); - } - - /// @brief returns the physical registers to be spilled and restored around - /// the instruction. - std::vector &getEmergencySpills(MachineInstr *MI) { - return EmergencySpillMap[MI]; - } - - /// @brief - transfer emergency spill information from one instruction to - /// another. - void transferEmergencySpills(MachineInstr *Old, MachineInstr *New) { - std::map >::iterator I = - EmergencySpillMap.find(Old); - if (I == EmergencySpillMap.end()) - return; - while (!I->second.empty()) { - unsigned virtReg = I->second.back(); - I->second.pop_back(); - addEmergencySpill(virtReg, New); - } - EmergencySpillMap.erase(I); - } - - /// @brief return or get a emergency spill slot for the register class. - int getEmergencySpillSlot(const TargetRegisterClass *RC); - - /// @brief Return lowest spill slot index. - int getLowSpillSlot() const { - return LowSpillSlot; - } - - /// @brief Return highest spill slot index. - int getHighSpillSlot() const { - return HighSpillSlot; - } - - /// @brief Records a spill slot use. - void addSpillSlotUse(int FrameIndex, MachineInstr *MI); - - /// @brief Returns true if spill slot has been used. - bool isSpillSlotUsed(int FrameIndex) const { - assert(FrameIndex >= 0 && "Spill slot index should not be negative!"); - return !SpillSlotToUsesMap[FrameIndex-LowSpillSlot].empty(); - } - - /// @brief Mark the specified register as being implicitly defined. - void setIsImplicitlyDefined(unsigned VirtReg) { - ImplicitDefed.set(VirtReg-TargetRegisterInfo::FirstVirtualRegister); - } - - /// @brief Returns true if the virtual register is implicitly defined. - bool isImplicitlyDefined(unsigned VirtReg) const { - return ImplicitDefed[VirtReg-TargetRegisterInfo::FirstVirtualRegister]; - } - - /// @brief Updates information about the specified virtual register's value - /// folded into newMI machine instruction. - void virtFolded(unsigned VirtReg, MachineInstr *OldMI, MachineInstr *NewMI, - ModRef MRInfo); - - /// @brief Updates information about the specified virtual register's value - /// folded into the specified machine instruction. - void virtFolded(unsigned VirtReg, MachineInstr *MI, ModRef MRInfo); - - /// @brief returns the virtual registers' values folded in memory - /// operands of this instruction - std::pair - getFoldedVirts(MachineInstr* MI) const { - return MI2VirtMap.equal_range(MI); - } - - /// RemoveMachineInstrFromMaps - MI is being erased, remove it from the - /// the folded instruction map and spill point map. - void RemoveMachineInstrFromMaps(MachineInstr *MI); - - /// FindUnusedRegisters - Gather a list of allocatable registers that - /// have not been allocated to any virtual register. - bool FindUnusedRegisters(LiveIntervals* LIs); - - /// HasUnusedRegisters - Return true if there are any allocatable registers - /// that have not been allocated to any virtual register. - bool HasUnusedRegisters() const { - return !UnusedRegs.none(); - } - - /// setRegisterUsed - Remember the physical register is now used. - void setRegisterUsed(unsigned Reg) { - UnusedRegs.reset(Reg); - } - - /// isRegisterUnused - Return true if the physical register has not been - /// used. - bool isRegisterUnused(unsigned Reg) const { - return UnusedRegs[Reg]; - } - - /// getFirstUnusedRegister - Return the first physical register that has not - /// been used. - unsigned getFirstUnusedRegister(const TargetRegisterClass *RC) { - int Reg = UnusedRegs.find_first(); - while (Reg != -1) { - if (allocatableRCRegs[RC][Reg]) - return (unsigned)Reg; - Reg = UnusedRegs.find_next(Reg); - } - return 0; - } - void print(raw_ostream &OS, const Module* M = 0) const; void dump() const; };