#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/LiveInterval.h"
+#include "llvm/CodeGen/SlotIndexes.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/Allocator.h"
#include <cmath>
+#include <iterator>
namespace llvm {
class TargetInstrInfo;
class TargetRegisterClass;
class VirtRegMap;
- typedef std::pair<unsigned, MachineBasicBlock*> IdxMBBPair;
-
- inline bool operator<(unsigned V, const IdxMBBPair &IM) {
- return V < IM.first;
- }
-
- inline bool operator<(const IdxMBBPair &IM, unsigned V) {
- return IM.first < V;
- }
-
- struct Idx2MBBCompare {
- bool operator()(const IdxMBBPair &LHS, const IdxMBBPair &RHS) const {
- return LHS.first < RHS.first;
- }
- };
class LiveIntervals : public MachineFunctionPass {
MachineFunction* mf_;
const TargetInstrInfo* tii_;
AliasAnalysis *aa_;
LiveVariables* lv_;
+ SlotIndexes* indexes_;
/// Special pool allocator for VNInfo's (LiveInterval val#).
///
- BumpPtrAllocator VNInfoAllocator;
-
- /// MBB2IdxMap - The indexes of the first and last instructions in the
- /// specified basic block.
- std::vector<std::pair<unsigned, unsigned> > MBB2IdxMap;
-
- /// Idx2MBBMap - Sorted list of pairs of index of first instruction
- /// and MBB id.
- std::vector<IdxMBBPair> Idx2MBBMap;
-
- /// FunctionSize - The number of instructions present in the function
- uint64_t FunctionSize;
-
- typedef DenseMap<const MachineInstr*, unsigned> Mi2IndexMap;
- Mi2IndexMap mi2iMap_;
-
- typedef std::vector<MachineInstr*> Index2MiMap;
- Index2MiMap i2miMap_;
+ VNInfo::Allocator VNInfoAllocator;
typedef DenseMap<unsigned, LiveInterval*> Reg2IntervalMap;
Reg2IntervalMap r2iMap_;
- DenseMap<MachineBasicBlock*, unsigned> terminatorGaps;
-
+ /// allocatableRegs_ - A bit vector of allocatable registers.
BitVector allocatableRegs_;
- std::vector<MachineInstr*> ClonedMIs;
-
- typedef LiveInterval::InstrSlots InstrSlots;
+ /// CloneMIs - A list of clones as result of re-materialization.
+ std::vector<MachineInstr*> CloneMIs;
public:
static char ID; // Pass identification, replacement for typeid
- LiveIntervals() : MachineFunctionPass(&ID) {}
+ LiveIntervals() : MachineFunctionPass(ID) {}
- static unsigned getBaseIndex(unsigned index) {
- return index - (index % InstrSlots::NUM);
- }
- static unsigned getBoundaryIndex(unsigned index) {
- return getBaseIndex(index + InstrSlots::NUM - 1);
- }
- static unsigned getLoadIndex(unsigned index) {
- return getBaseIndex(index) + InstrSlots::LOAD;
- }
- static unsigned getUseIndex(unsigned index) {
- return getBaseIndex(index) + InstrSlots::USE;
- }
- static unsigned getDefIndex(unsigned index) {
- return getBaseIndex(index) + InstrSlots::DEF;
- }
- static unsigned getStoreIndex(unsigned index) {
- return getBaseIndex(index) + InstrSlots::STORE;
- }
+ // Calculate the spill weight to assign to a single instruction.
+ static float getSpillWeight(bool isDef, bool isUse, unsigned loopDepth);
- static float getSpillWeight(bool isDef, bool isUse, unsigned loopDepth) {
- return (isDef + isUse) * powf(10.0F, (float)loopDepth);
+ // After summing the spill weights of all defs and uses, the final weight
+ // should be normalized, dividing the weight of the interval by its size.
+ // This encourages spilling of intervals that are large and have few uses,
+ // and discourages spilling of small intervals with many uses.
+ void normalizeSpillWeight(LiveInterval &li) {
+ li.weight /= getApproximateInstructionCount(li) + 25;
}
typedef Reg2IntervalMap::iterator iterator;
return r2iMap_.count(reg);
}
- /// getMBBStartIdx - Return the base index of the first instruction in the
- /// specified MachineBasicBlock.
- unsigned getMBBStartIdx(MachineBasicBlock *MBB) const {
- return getMBBStartIdx(MBB->getNumber());
- }
- unsigned getMBBStartIdx(unsigned MBBNo) const {
- assert(MBBNo < MBB2IdxMap.size() && "Invalid MBB number!");
- return MBB2IdxMap[MBBNo].first;
- }
-
- /// getMBBEndIdx - Return the store index of the last instruction in the
- /// specified MachineBasicBlock.
- unsigned getMBBEndIdx(MachineBasicBlock *MBB) const {
- return getMBBEndIdx(MBB->getNumber());
- }
- unsigned getMBBEndIdx(unsigned MBBNo) const {
- assert(MBBNo < MBB2IdxMap.size() && "Invalid MBB number!");
- return MBB2IdxMap[MBBNo].second;
- }
-
/// getScaledIntervalSize - get the size of an interval in "units,"
/// where every function is composed of one thousand units. This
/// measure scales properly with empty index slots in the function.
double getScaledIntervalSize(LiveInterval& I) {
- return (1000.0 / InstrSlots::NUM * I.getSize()) / i2miMap_.size();
+ return (1000.0 * I.getSize()) / indexes_->getIndexesLength();
+ }
+
+ /// getFuncInstructionCount - Return the number of instructions in the
+ /// current function.
+ unsigned getFuncInstructionCount() {
+ return indexes_->getFunctionSize();
}
/// getApproximateInstructionCount - computes an estimate of the number
/// of instructions in a given LiveInterval.
unsigned getApproximateInstructionCount(LiveInterval& I) {
double IntervalPercentage = getScaledIntervalSize(I) / 1000.0;
- return (unsigned)(IntervalPercentage * FunctionSize);
- }
-
- /// getMBBFromIndex - given an index in any instruction of an
- /// MBB return a pointer the MBB
- MachineBasicBlock* getMBBFromIndex(unsigned index) const {
- std::vector<IdxMBBPair>::const_iterator I =
- std::lower_bound(Idx2MBBMap.begin(), Idx2MBBMap.end(), index);
- // Take the pair containing the index
- std::vector<IdxMBBPair>::const_iterator J =
- ((I != Idx2MBBMap.end() && I->first > index) ||
- (I == Idx2MBBMap.end() && Idx2MBBMap.size()>0)) ? (I-1): I;
-
- assert(J != Idx2MBBMap.end() && J->first < index+1 &&
- index <= getMBBEndIdx(J->second) &&
- "index does not correspond to an MBB");
- return J->second;
- }
-
- /// getInstructionIndex - returns the base index of instr
- unsigned getInstructionIndex(const MachineInstr* instr) const {
- Mi2IndexMap::const_iterator it = mi2iMap_.find(instr);
- assert(it != mi2iMap_.end() && "Invalid instruction!");
- return it->second;
- }
-
- /// getInstructionFromIndex - given an index in any slot of an
- /// instruction return a pointer the instruction
- MachineInstr* getInstructionFromIndex(unsigned index) const {
- index /= InstrSlots::NUM; // convert index to vector index
- assert(index < i2miMap_.size() &&
- "index does not correspond to an instruction");
- return i2miMap_[index];
- }
-
- /// hasGapBeforeInstr - Return true if the previous instruction slot,
- /// i.e. Index - InstrSlots::NUM, is not occupied.
- bool hasGapBeforeInstr(unsigned Index) {
- Index = getBaseIndex(Index - InstrSlots::NUM);
- return getInstructionFromIndex(Index) == 0;
- }
-
- /// hasGapAfterInstr - Return true if the successive instruction slot,
- /// i.e. Index + InstrSlots::Num, is not occupied.
- bool hasGapAfterInstr(unsigned Index) {
- Index = getBaseIndex(Index + InstrSlots::NUM);
- return getInstructionFromIndex(Index) == 0;
+ return (unsigned)(IntervalPercentage * indexes_->getFunctionSize());
}
- /// findGapBeforeInstr - Find an empty instruction slot before the
- /// specified index. If "Furthest" is true, find one that's furthest
- /// away from the index (but before any index that's occupied).
- unsigned findGapBeforeInstr(unsigned Index, bool Furthest = false) {
- Index = getBaseIndex(Index - InstrSlots::NUM);
- if (getInstructionFromIndex(Index))
- return 0; // No gap!
- if (!Furthest)
- return Index;
- unsigned PrevIndex = getBaseIndex(Index - InstrSlots::NUM);
- while (getInstructionFromIndex(Index)) {
- Index = PrevIndex;
- PrevIndex = getBaseIndex(Index - InstrSlots::NUM);
- }
- return Index;
- }
-
- /// InsertMachineInstrInMaps - Insert the specified machine instruction
- /// into the instruction index map at the given index.
- void InsertMachineInstrInMaps(MachineInstr *MI, unsigned Index) {
- i2miMap_[Index / InstrSlots::NUM] = MI;
- Mi2IndexMap::iterator it = mi2iMap_.find(MI);
- assert(it == mi2iMap_.end() && "Already in map!");
- mi2iMap_[MI] = Index;
- }
-
- /// conflictsWithPhysRegDef - Returns true if the specified register
- /// is defined during the duration of the specified interval.
- bool conflictsWithPhysRegDef(const LiveInterval &li, VirtRegMap &vrm,
- unsigned reg);
-
- /// conflictsWithPhysRegRef - Similar to conflictsWithPhysRegRef except
- /// it can check use as well.
- bool conflictsWithPhysRegRef(LiveInterval &li, unsigned Reg,
- bool CheckUse,
- SmallPtrSet<MachineInstr*,32> &JoinedCopies);
+ /// conflictsWithPhysReg - Returns true if the specified register is used or
+ /// defined during the duration of the specified interval. Copies to and
+ /// from li.reg are allowed. This method is only able to analyze simple
+ /// ranges that stay within a single basic block. Anything else is
+ /// considered a conflict.
+ bool conflictsWithPhysReg(const LiveInterval &li, VirtRegMap &vrm,
+ unsigned reg);
- /// findLiveInMBBs - Given a live range, if the value of the range
- /// is live in any MBB returns true as well as the list of basic blocks
- /// in which the value is live.
- bool findLiveInMBBs(unsigned Start, unsigned End,
- SmallVectorImpl<MachineBasicBlock*> &MBBs) const;
-
- /// findReachableMBBs - Return a list MBB that can be reached via any
- /// branch or fallthroughs. Return true if the list is not empty.
- bool findReachableMBBs(unsigned Start, unsigned End,
- SmallVectorImpl<MachineBasicBlock*> &MBBs) const;
+ /// conflictsWithAliasRef - Similar to conflictsWithPhysRegRef except
+ /// it checks for alias uses and defs.
+ bool conflictsWithAliasRef(LiveInterval &li, unsigned Reg,
+ SmallPtrSet<MachineInstr*,32> &JoinedCopies);
// Interval creation
-
LiveInterval &getOrCreateInterval(unsigned reg) {
Reg2IntervalMap::iterator I = r2iMap_.find(reg);
if (I == r2iMap_.end())
/// addLiveRangeToEndOfBlock - Given a register and an instruction,
/// adds a live range from that instruction to the end of its MBB.
LiveRange addLiveRangeToEndOfBlock(unsigned reg,
- MachineInstr* startInst);
+ MachineInstr* startInst);
// Interval removal
r2iMap_.erase(I);
}
+ SlotIndex getZeroIndex() const {
+ return indexes_->getZeroIndex();
+ }
+
+ SlotIndex getInvalidIndex() const {
+ return indexes_->getInvalidIndex();
+ }
+
/// isNotInMIMap - returns true if the specified machine instr has been
/// removed or was never entered in the map.
- bool isNotInMIMap(MachineInstr* instr) const {
- return !mi2iMap_.count(instr);
+ bool isNotInMIMap(const MachineInstr* Instr) const {
+ return !indexes_->hasIndex(Instr);
+ }
+
+ /// Returns the base index of the given instruction.
+ SlotIndex getInstructionIndex(const MachineInstr *instr) const {
+ return indexes_->getInstructionIndex(instr);
+ }
+
+ /// Returns the instruction associated with the given index.
+ MachineInstr* getInstructionFromIndex(SlotIndex index) const {
+ return indexes_->getInstructionFromIndex(index);
+ }
+
+ /// Return the first index in the given basic block.
+ SlotIndex getMBBStartIdx(const MachineBasicBlock *mbb) const {
+ return indexes_->getMBBStartIdx(mbb);
+ }
+
+ /// Return the last index in the given basic block.
+ SlotIndex getMBBEndIdx(const MachineBasicBlock *mbb) const {
+ return indexes_->getMBBEndIdx(mbb);
+ }
+
+ bool isLiveInToMBB(const LiveInterval &li,
+ const MachineBasicBlock *mbb) const {
+ return li.liveAt(getMBBStartIdx(mbb));
+ }
+
+ LiveRange* findEnteringRange(LiveInterval &li,
+ const MachineBasicBlock *mbb) {
+ return li.getLiveRangeContaining(getMBBStartIdx(mbb));
+ }
+
+ bool isLiveOutOfMBB(const LiveInterval &li,
+ const MachineBasicBlock *mbb) const {
+ return li.liveAt(getMBBEndIdx(mbb).getPrevSlot());
+ }
+
+ LiveRange* findExitingRange(LiveInterval &li,
+ const MachineBasicBlock *mbb) {
+ return li.getLiveRangeContaining(getMBBEndIdx(mbb).getPrevSlot());
+ }
+
+ MachineBasicBlock* getMBBFromIndex(SlotIndex index) const {
+ return indexes_->getMBBFromIndex(index);
+ }
+
+ SlotIndex getMBBTerminatorGap(const MachineBasicBlock *mbb) {
+ return indexes_->getTerminatorGap(mbb);
+ }
+
+ SlotIndex InsertMachineInstrInMaps(MachineInstr *MI) {
+ return indexes_->insertMachineInstrInMaps(MI);
}
- /// RemoveMachineInstrFromMaps - This marks the specified machine instr as
- /// deleted.
void RemoveMachineInstrFromMaps(MachineInstr *MI) {
- // remove index -> MachineInstr and
- // MachineInstr -> index mappings
- Mi2IndexMap::iterator mi2i = mi2iMap_.find(MI);
- if (mi2i != mi2iMap_.end()) {
- i2miMap_[mi2i->second/InstrSlots::NUM] = 0;
- mi2iMap_.erase(mi2i);
- }
+ indexes_->removeMachineInstrFromMaps(MI);
}
- /// ReplaceMachineInstrInMaps - Replacing a machine instr with a new one in
- /// maps used by register allocator.
void ReplaceMachineInstrInMaps(MachineInstr *MI, MachineInstr *NewMI) {
- Mi2IndexMap::iterator mi2i = mi2iMap_.find(MI);
- if (mi2i == mi2iMap_.end())
- return;
- i2miMap_[mi2i->second/InstrSlots::NUM] = NewMI;
- Mi2IndexMap::iterator it = mi2iMap_.find(MI);
- assert(it != mi2iMap_.end() && "Invalid instruction!");
- unsigned Index = it->second;
- mi2iMap_.erase(it);
- mi2iMap_[NewMI] = Index;
+ indexes_->replaceMachineInstrInMaps(MI, NewMI);
}
- BumpPtrAllocator& getVNInfoAllocator() { return VNInfoAllocator; }
+ void InsertMBBInMaps(MachineBasicBlock *MBB) {
+ indexes_->insertMBBInMaps(MBB);
+ }
+
+ bool findLiveInMBBs(SlotIndex Start, SlotIndex End,
+ SmallVectorImpl<MachineBasicBlock*> &MBBs) const {
+ return indexes_->findLiveInMBBs(Start, End, MBBs);
+ }
+
+ void renumber() {
+ indexes_->renumberIndexes();
+ }
- /// getVNInfoSourceReg - Helper function that parses the specified VNInfo
- /// copy field and returns the source register that defines it.
- unsigned getVNInfoSourceReg(const VNInfo *VNI) const;
+ VNInfo::Allocator& getVNInfoAllocator() { return VNInfoAllocator; }
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
virtual void releaseMemory();
virtual bool runOnMachineFunction(MachineFunction&);
/// print - Implement the dump method.
- virtual void print(std::ostream &O, const Module* = 0) const;
+ virtual void print(raw_ostream &O, const Module* = 0) const;
/// addIntervalsForSpills - Create new intervals for spilled defs / uses of
/// the given interval. FIXME: It also returns the weight of the spill slot
addIntervalsForSpills(const LiveInterval& i,
SmallVectorImpl<LiveInterval*> &SpillIs,
const MachineLoopInfo *loopInfo, VirtRegMap& vrm);
-
- /// addIntervalsForSpillsFast - Quickly create new intervals for spilled
- /// defs / uses without remat or splitting.
- std::vector<LiveInterval*>
- addIntervalsForSpillsFast(const LiveInterval &li,
- const MachineLoopInfo *loopInfo, VirtRegMap &vrm);
/// spillPhysRegAroundRegDefsUses - Spill the specified physical register
/// around all defs and uses of the specified interval. Return true if it
unsigned getNumConflictsWithPhysReg(const LiveInterval &li,
unsigned PhysReg) const;
- /// processImplicitDefs - Process IMPLICIT_DEF instructions. Add isUndef
- /// marker to implicit_def defs and their uses.
- void processImplicitDefs();
-
- /// computeNumbering - Compute the index numbering.
- void computeNumbering();
-
- /// scaleNumbering - Rescale interval numbers to introduce gaps for new
- /// instructions
- void scaleNumbering(int factor);
-
/// intervalIsInOneMBB - Returns true if the specified interval is entirely
/// within a single basic block.
bool intervalIsInOneMBB(const LiveInterval &li) const;
private:
/// computeIntervals - Compute live intervals.
void computeIntervals();
-
+
/// handleRegisterDef - update intervals for a register def
/// (calls handlePhysicalRegisterDef and
/// handleVirtualRegisterDef)
void handleRegisterDef(MachineBasicBlock *MBB,
- MachineBasicBlock::iterator MI, unsigned MIIdx,
+ MachineBasicBlock::iterator MI,
+ SlotIndex MIIdx,
MachineOperand& MO, unsigned MOIdx);
+ /// isPartialRedef - Return true if the specified def at the specific index
+ /// is partially re-defining the specified live interval. A common case of
+ /// this is a definition of the sub-register.
+ bool isPartialRedef(SlotIndex MIIdx, MachineOperand &MO,
+ LiveInterval &interval);
+
/// handleVirtualRegisterDef - update intervals for a virtual
/// register def
void handleVirtualRegisterDef(MachineBasicBlock *MBB,
MachineBasicBlock::iterator MI,
- unsigned MIIdx, MachineOperand& MO,
- unsigned MOIdx, LiveInterval& interval);
+ SlotIndex MIIdx, MachineOperand& MO,
+ unsigned MOIdx,
+ LiveInterval& interval);
/// handlePhysicalRegisterDef - update intervals for a physical register
/// def.
void handlePhysicalRegisterDef(MachineBasicBlock* mbb,
MachineBasicBlock::iterator mi,
- unsigned MIIdx, MachineOperand& MO,
+ SlotIndex MIIdx, MachineOperand& MO,
LiveInterval &interval,
MachineInstr *CopyMI);
/// handleLiveInRegister - Create interval for a livein register.
void handleLiveInRegister(MachineBasicBlock* mbb,
- unsigned MIIdx,
+ SlotIndex MIIdx,
LiveInterval &interval, bool isAlias = false);
/// getReMatImplicitUse - If the remat definition MI has one (for now, we
/// which reaches the given instruction also reaches the specified use
/// index.
bool isValNoAvailableAt(const LiveInterval &li, MachineInstr *MI,
- unsigned UseIdx) const;
+ SlotIndex UseIdx) const;
/// isReMaterializable - Returns true if the definition MI of the specified
/// val# of the specified interval is re-materializable. Also returns true
/// MI. If it is successul, MI is updated with the newly created MI and
/// returns true.
bool tryFoldMemoryOperand(MachineInstr* &MI, VirtRegMap &vrm,
- MachineInstr *DefMI, unsigned InstrIdx,
+ MachineInstr *DefMI, SlotIndex InstrIdx,
SmallVector<unsigned, 2> &Ops,
- bool isSS, int Slot, unsigned Reg);
+ bool isSS, int FrameIndex, unsigned Reg);
/// canFoldMemoryOperand - Return true if the specified load / store
/// folding is possible.
/// anyKillInMBBAfterIdx - Returns true if there is a kill of the specified
/// VNInfo that's after the specified index but is within the basic block.
bool anyKillInMBBAfterIdx(const LiveInterval &li, const VNInfo *VNI,
- MachineBasicBlock *MBB, unsigned Idx) const;
+ MachineBasicBlock *MBB,
+ SlotIndex Idx) const;
/// hasAllocatableSuperReg - Return true if the specified physical register
/// has any super register that's allocatable.
/// SRInfo - Spill / restore info.
struct SRInfo {
- int index;
+ SlotIndex index;
unsigned vreg;
bool canFold;
- SRInfo(int i, unsigned vr, bool f) : index(i), vreg(vr), canFold(f) {};
+ SRInfo(SlotIndex i, unsigned vr, bool f)
+ : index(i), vreg(vr), canFold(f) {}
};
- bool alsoFoldARestore(int Id, int index, unsigned vr,
+ bool alsoFoldARestore(int Id, SlotIndex index, unsigned vr,
BitVector &RestoreMBBs,
DenseMap<unsigned,std::vector<SRInfo> >&RestoreIdxes);
- void eraseRestoreInfo(int Id, int index, unsigned vr,
+ void eraseRestoreInfo(int Id, SlotIndex index, unsigned vr,
BitVector &RestoreMBBs,
DenseMap<unsigned,std::vector<SRInfo> >&RestoreIdxes);
/// functions for addIntervalsForSpills to rewrite uses / defs for the given
/// live range.
bool rewriteInstructionForSpills(const LiveInterval &li, const VNInfo *VNI,
- bool TrySplit, unsigned index, unsigned end, MachineInstr *MI,
- MachineInstr *OrigDefMI, MachineInstr *DefMI, unsigned Slot, int LdSlot,
+ bool TrySplit, SlotIndex index, SlotIndex end,
+ MachineInstr *MI, MachineInstr *OrigDefMI, MachineInstr *DefMI,
+ unsigned Slot, int LdSlot,
bool isLoad, bool isLoadSS, bool DefIsReMat, bool CanDelete,
VirtRegMap &vrm, const TargetRegisterClass* rc,
SmallVector<int, 4> &ReMatIds, const MachineLoopInfo *loopInfo,
DenseMap<unsigned,unsigned> &MBBVRegsMap,
std::vector<LiveInterval*> &NewLIs);
+ // Normalize the spill weight of all the intervals in NewLIs.
+ void normalizeSpillWeights(std::vector<LiveInterval*> &NewLIs);
+
static LiveInterval* createInterval(unsigned Reg);
- void printRegName(unsigned reg) const;
+ void printInstrs(raw_ostream &O) const;
+ void dumpInstrs() const;
};
} // End llvm namespace
projects / oota-llvm.git / blobdiff