X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FLiveInterval.cpp;h=e207f607dad2c13e6a678911d1a2f7b11f26b963;hb=5c8697488ad6d860c448b6e7bed80dec8c90b585;hp=75cd36dec2c43187ab67eee44ccfda6ff9f171ef;hpb=a2e6435e483f30e00382a5758f6dcc67e213b57a;p=oota-llvm.git diff --git a/lib/CodeGen/LiveInterval.cpp b/lib/CodeGen/LiveInterval.cpp index 75cd36dec2c..e207f607dad 100644 --- a/lib/CodeGen/LiveInterval.cpp +++ b/lib/CodeGen/LiveInterval.cpp @@ -10,7 +10,7 @@ // This file implements the LiveRange and LiveInterval classes. Given some // numbering of each the machine instructions an interval [i, j) is said to be a // live interval for register v if there is no instruction with number j' > j -// such that v is live at j' abd there is no instruction with number i' < i such +// such that v is live at j' and there is no instruction with number i' < i such // that v is live at i'. In this implementation intervals can have holes, // i.e. an interval might look like [1,20), [50,65), [1000,1001). Each // individual range is represented as an instance of LiveRange, and the whole @@ -19,12 +19,15 @@ //===----------------------------------------------------------------------===// #include "llvm/CodeGen/LiveInterval.h" +#include "llvm/CodeGen/LiveIntervalAnalysis.h" +#include "llvm/CodeGen/MachineRegisterInfo.h" +#include "llvm/ADT/DenseMap.h" #include "llvm/ADT/SmallSet.h" #include "llvm/ADT/STLExtras.h" -#include "llvm/Support/Streams.h" +#include "llvm/Support/Debug.h" +#include "llvm/Support/raw_ostream.h" #include "llvm/Target/TargetRegisterInfo.h" #include -#include using namespace llvm; // An example for liveAt(): @@ -34,7 +37,7 @@ using namespace llvm; // variable it represents. This is because slot 1 is used (def slot) and spans // up to slot 3 (store slot). // -bool LiveInterval::liveAt(unsigned I) const { +bool LiveInterval::liveAt(SlotIndex I) const { Ranges::const_iterator r = std::upper_bound(ranges.begin(), ranges.end(), I); if (r == ranges.begin()) @@ -47,7 +50,7 @@ bool LiveInterval::liveAt(unsigned I) const { // liveBeforeAndAt - Check if the interval is live at the index and the index // just before it. If index is liveAt, check if it starts a new live range. // If it does, then check if the previous live range ends at index-1. -bool LiveInterval::liveBeforeAndAt(unsigned I) const { +bool LiveInterval::liveBeforeAndAt(SlotIndex I) const { Ranges::const_iterator r = std::upper_bound(ranges.begin(), ranges.end(), I); if (r == ranges.begin()) @@ -123,14 +126,30 @@ bool LiveInterval::overlapsFrom(const LiveInterval& other, return false; } +/// overlaps - Return true if the live interval overlaps a range specified +/// by [Start, End). +bool LiveInterval::overlaps(SlotIndex Start, SlotIndex End) const { + assert(Start < End && "Invalid range"); + const_iterator I = begin(); + const_iterator E = end(); + const_iterator si = std::upper_bound(I, E, Start); + const_iterator ei = std::upper_bound(I, E, End); + if (si != ei) + return true; + if (si == I) + return false; + --si; + return si->contains(Start); +} + /// extendIntervalEndTo - This method is used when we want to extend the range /// specified by I to end at the specified endpoint. To do this, we should /// merge and eliminate all ranges that this will overlap with. The iterator is /// not invalidated. -void LiveInterval::extendIntervalEndTo(Ranges::iterator I, unsigned NewEnd) { +void LiveInterval::extendIntervalEndTo(Ranges::iterator I, SlotIndex NewEnd) { assert(I != ranges.end() && "Not a valid interval!"); VNInfo *ValNo = I->valno; - unsigned OldEnd = I->end; + SlotIndex OldEnd = I->end; // Search for the first interval that we can't merge with. Ranges::iterator MergeTo = next(I); @@ -145,7 +164,7 @@ void LiveInterval::extendIntervalEndTo(Ranges::iterator I, unsigned NewEnd) { ranges.erase(next(I), MergeTo); // Update kill info. - removeKills(ValNo, OldEnd, I->end-1); + ValNo->removeKills(OldEnd, I->end.getPrevSlot()); // If the newly formed range now touches the range after it and if they have // the same value number, merge the two ranges into one range. @@ -161,7 +180,7 @@ void LiveInterval::extendIntervalEndTo(Ranges::iterator I, unsigned NewEnd) { /// specified by I to start at the specified endpoint. To do this, we should /// merge and eliminate all ranges that this will overlap with. LiveInterval::Ranges::iterator -LiveInterval::extendIntervalStartTo(Ranges::iterator I, unsigned NewStart) { +LiveInterval::extendIntervalStartTo(Ranges::iterator I, SlotIndex NewStart) { assert(I != ranges.end() && "Not a valid interval!"); VNInfo *ValNo = I->valno; @@ -194,7 +213,7 @@ LiveInterval::extendIntervalStartTo(Ranges::iterator I, unsigned NewStart) { LiveInterval::iterator LiveInterval::addRangeFrom(LiveRange LR, iterator From) { - unsigned Start = LR.start, End = LR.end; + SlotIndex Start = LR.start, End = LR.end; iterator it = std::upper_bound(From, ranges.end(), Start); // If the inserted interval starts in the middle or right at the end of @@ -228,7 +247,7 @@ LiveInterval::addRangeFrom(LiveRange LR, iterator From) { extendIntervalEndTo(it, End); else if (End < it->end) // Overlapping intervals, there might have been a kill here. - removeKill(it->valno, End); + it->valno->removeKill(End); return it; } } else { @@ -244,33 +263,32 @@ LiveInterval::addRangeFrom(LiveRange LR, iterator From) { return ranges.insert(it, LR); } -/// isInOneLiveRange - Return true if the range specified is entirely in the +/// isInOneLiveRange - Return true if the range specified is entirely in /// a single LiveRange of the live interval. -bool LiveInterval::isInOneLiveRange(unsigned Start, unsigned End) { +bool LiveInterval::isInOneLiveRange(SlotIndex Start, SlotIndex End) { Ranges::iterator I = std::upper_bound(ranges.begin(), ranges.end(), Start); if (I == ranges.begin()) return false; --I; - return I->contains(Start) && I->contains(End-1); + return I->containsRange(Start, End); } /// removeRange - Remove the specified range from this interval. Note that /// the range must be in a single LiveRange in its entirety. -void LiveInterval::removeRange(unsigned Start, unsigned End, +void LiveInterval::removeRange(SlotIndex Start, SlotIndex End, bool RemoveDeadValNo) { // Find the LiveRange containing this span. Ranges::iterator I = std::upper_bound(ranges.begin(), ranges.end(), Start); assert(I != ranges.begin() && "Range is not in interval!"); --I; - assert(I->contains(Start) && I->contains(End-1) && - "Range is not entirely in interval!"); + assert(I->containsRange(Start, End) && "Range is not entirely in interval!"); // If the span we are removing is at the start of the LiveRange, adjust it. VNInfo *ValNo = I->valno; if (I->start == Start) { if (I->end == End) { - removeKills(I->valno, Start, End); + ValNo->removeKills(Start, End); if (RemoveDeadValNo) { // Check if val# is dead. bool isDead = true; @@ -288,9 +306,9 @@ void LiveInterval::removeRange(unsigned Start, unsigned End, VNInfo *VNI = valnos.back(); valnos.pop_back(); VNI->~VNInfo(); - } while (!valnos.empty() && valnos.back()->def == ~1U); + } while (!valnos.empty() && valnos.back()->isUnused()); } else { - ValNo->def = ~1U; + ValNo->setIsUnused(true); } } } @@ -304,13 +322,13 @@ void LiveInterval::removeRange(unsigned Start, unsigned End, // Otherwise if the span we are removing is at the end of the LiveRange, // adjust the other way. if (I->end == End) { - removeKills(ValNo, Start, End); + ValNo->removeKills(Start, End); I->end = Start; return; } // Otherwise, we are splitting the LiveRange into two pieces. - unsigned OldEnd = I->end; + SlotIndex OldEnd = I->end; I->end = Start; // Trim the old interval. // Insert the new one. @@ -336,16 +354,16 @@ void LiveInterval::removeValNo(VNInfo *ValNo) { VNInfo *VNI = valnos.back(); valnos.pop_back(); VNI->~VNInfo(); - } while (!valnos.empty() && valnos.back()->def == ~1U); + } while (!valnos.empty() && valnos.back()->isUnused()); } else { - ValNo->def = ~1U; + ValNo->setIsUnused(true); } } - + /// getLiveRangeContaining - Return the live range that contains the /// specified index, or null if there is none. LiveInterval::const_iterator -LiveInterval::FindLiveRangeContaining(unsigned Idx) const { +LiveInterval::FindLiveRangeContaining(SlotIndex Idx) const { const_iterator It = std::upper_bound(begin(), end(), Idx); if (It != ranges.begin()) { --It; @@ -357,7 +375,7 @@ LiveInterval::FindLiveRangeContaining(unsigned Idx) const { } LiveInterval::iterator -LiveInterval::FindLiveRangeContaining(unsigned Idx) { +LiveInterval::FindLiveRangeContaining(SlotIndex Idx) { iterator It = std::upper_bound(begin(), end(), Idx); if (It != begin()) { --It; @@ -368,26 +386,37 @@ LiveInterval::FindLiveRangeContaining(unsigned Idx) { return end(); } -/// findDefinedVNInfo - Find the VNInfo that's defined at the specified index -/// (register interval) or defined by the specified register (stack inteval). -VNInfo *LiveInterval::findDefinedVNInfo(unsigned DefIdxOrReg) const { - VNInfo *VNI = NULL; +/// findDefinedVNInfo - Find the VNInfo defined by the specified +/// index (register interval). +VNInfo *LiveInterval::findDefinedVNInfoForRegInt(SlotIndex Idx) const { for (LiveInterval::const_vni_iterator i = vni_begin(), e = vni_end(); - i != e; ++i) - if ((*i)->def == DefIdxOrReg) { - VNI = *i; - break; - } - return VNI; + i != e; ++i) { + if ((*i)->def == Idx) + return *i; + } + + return 0; } +/// findDefinedVNInfo - Find the VNInfo defined by the specified +/// register (stack inteval). +VNInfo *LiveInterval::findDefinedVNInfoForStackInt(unsigned reg) const { + for (LiveInterval::const_vni_iterator i = vni_begin(), e = vni_end(); + i != e; ++i) { + if ((*i)->getReg() == reg) + return *i; + } + return 0; +} /// join - Join two live intervals (this, and other) together. This applies /// mappings to the value numbers in the LHS/RHS intervals as specified. If /// the intervals are not joinable, this aborts. -void LiveInterval::join(LiveInterval &Other, const int *LHSValNoAssignments, +void LiveInterval::join(LiveInterval &Other, + const int *LHSValNoAssignments, const int *RHSValNoAssignments, - SmallVector &NewVNInfo) { + SmallVector &NewVNInfo, + MachineRegisterInfo *MRI) { // Determine if any of our live range values are mapped. This is uncommon, so // we want to avoid the interval scan if not. bool MustMapCurValNos = false; @@ -441,7 +470,7 @@ void LiveInterval::join(LiveInterval &Other, const int *LHSValNoAssignments, for (unsigned i = 0; i < NumNewVals; ++i) { VNInfo *VNI = NewVNInfo[i]; if (VNI) { - if (i >= NumVals) + if (NumValNos >= NumVals) valnos.push_back(VNI); else valnos[NumValNos] = VNI; @@ -461,9 +490,19 @@ void LiveInterval::join(LiveInterval &Other, const int *LHSValNoAssignments, InsertPos = addRangeFrom(*I, InsertPos); } - weight += Other.weight; - if (Other.preference && !preference) - preference = Other.preference; + ComputeJoinedWeight(Other); + + // Update regalloc hint if currently there isn't one. + if (TargetRegisterInfo::isVirtualRegister(reg) && + TargetRegisterInfo::isVirtualRegister(Other.reg)) { + std::pair Hint = MRI->getRegAllocationHint(reg); + if (Hint.first == 0 && Hint.second == 0) { + std::pair OtherHint = + MRI->getRegAllocationHint(Other.reg); + if (OtherHint.first || OtherHint.second) + MRI->setRegAllocationHint(reg, OtherHint.first, OtherHint.second); + } + } } /// MergeRangesInAsValue - Merge all of the intervals in RHS into this live @@ -488,14 +527,15 @@ void LiveInterval::MergeRangesInAsValue(const LiveInterval &RHS, /// The LiveRanges in RHS are allowed to overlap with LiveRanges in the /// current interval, it will replace the value numbers of the overlaped /// live ranges with the specified value number. -void LiveInterval::MergeValueInAsValue(const LiveInterval &RHS, - const VNInfo *RHSValNo, VNInfo *LHSValNo) { +void LiveInterval::MergeValueInAsValue( + const LiveInterval &RHS, + const VNInfo *RHSValNo, VNInfo *LHSValNo) { SmallVector ReplacedValNos; iterator IP = begin(); for (const_iterator I = RHS.begin(), E = RHS.end(); I != E; ++I) { if (I->valno != RHSValNo) continue; - unsigned Start = I->start, End = I->end; + SlotIndex Start = I->start, End = I->end; IP = std::upper_bound(IP, end(), Start); // If the start of this range overlaps with an existing liverange, trim it. if (IP != begin() && IP[-1].end > Start) { @@ -542,69 +582,94 @@ void LiveInterval::MergeValueInAsValue(const LiveInterval &RHS, VNInfo *VNI = valnos.back(); valnos.pop_back(); VNI->~VNInfo(); - } while (!valnos.empty() && valnos.back()->def == ~1U); + } while (!valnos.empty() && valnos.back()->isUnused()); } else { - V1->def = ~1U; + V1->setIsUnused(true); } } } } } -VNInfo *LiveInterval::getUnknownValNo(BumpPtrAllocator &VNInfoAllocator) { - unsigned i = getNumValNums(); - if (i) { - do { - --i; - VNInfo *VNI = getValNumInfo(i); - if (VNI->def == ~0U && !VNI->copy && - !VNI->hasPHIKill && !VNI->redefByEC && VNI->kills.empty()) - return VNI; - } while (i != 0); - } - return getNextValue(~0U, 0, VNInfoAllocator); -} - /// MergeInClobberRanges - For any live ranges that are not defined in the /// current interval, but are defined in the Clobbers interval, mark them /// used with an unknown definition value. -void LiveInterval::MergeInClobberRanges(const LiveInterval &Clobbers, +void LiveInterval::MergeInClobberRanges(LiveIntervals &li_, + const LiveInterval &Clobbers, BumpPtrAllocator &VNInfoAllocator) { if (Clobbers.empty()) return; - // Find a value # to use for the clobber ranges. If there is already a value# - // for unknown values, use it. - VNInfo *ClobberValNo = getUnknownValNo(VNInfoAllocator); - + DenseMap ValNoMaps; + VNInfo *UnusedValNo = 0; iterator IP = begin(); for (const_iterator I = Clobbers.begin(), E = Clobbers.end(); I != E; ++I) { - unsigned Start = I->start, End = I->end; - IP = std::upper_bound(IP, end(), Start); - - // If the start of this range overlaps with an existing liverange, trim it. - if (IP != begin() && IP[-1].end > Start) { - Start = IP[-1].end; - // Trimmed away the whole range? - if (Start >= End) continue; + // For every val# in the Clobbers interval, create a new "unknown" val#. + VNInfo *ClobberValNo = 0; + DenseMap::iterator VI = ValNoMaps.find(I->valno); + if (VI != ValNoMaps.end()) + ClobberValNo = VI->second; + else if (UnusedValNo) + ClobberValNo = UnusedValNo; + else { + UnusedValNo = ClobberValNo = + getNextValue(li_.getInvalidIndex(), 0, false, VNInfoAllocator); + ValNoMaps.insert(std::make_pair(I->valno, ClobberValNo)); } - // If the end of this range overlaps with an existing liverange, trim it. - if (IP != end() && End > IP->start) { - End = IP->start; - // If this trimmed away the whole range, ignore it. - if (Start == End) continue; + + bool Done = false; + SlotIndex Start = I->start, End = I->end; + // If a clobber range starts before an existing range and ends after + // it, the clobber range will need to be split into multiple ranges. + // Loop until the entire clobber range is handled. + while (!Done) { + Done = true; + IP = std::upper_bound(IP, end(), Start); + SlotIndex SubRangeStart = Start; + SlotIndex SubRangeEnd = End; + + // If the start of this range overlaps with an existing liverange, trim it. + if (IP != begin() && IP[-1].end > SubRangeStart) { + SubRangeStart = IP[-1].end; + // Trimmed away the whole range? + if (SubRangeStart >= SubRangeEnd) continue; + } + // If the end of this range overlaps with an existing liverange, trim it. + if (IP != end() && SubRangeEnd > IP->start) { + // If the clobber live range extends beyond the existing live range, + // it'll need at least another live range, so set the flag to keep + // iterating. + if (SubRangeEnd > IP->end) { + Start = IP->end; + Done = false; + } + SubRangeEnd = IP->start; + // If this trimmed away the whole range, ignore it. + if (SubRangeStart == SubRangeEnd) continue; + } + + // Insert the clobber interval. + IP = addRangeFrom(LiveRange(SubRangeStart, SubRangeEnd, ClobberValNo), + IP); + UnusedValNo = 0; } - - // Insert the clobber interval. - IP = addRangeFrom(LiveRange(Start, End, ClobberValNo), IP); + } + + if (UnusedValNo) { + // Delete the last unused val#. + valnos.pop_back(); + UnusedValNo->~VNInfo(); } } -void LiveInterval::MergeInClobberRange(unsigned Start, unsigned End, +void LiveInterval::MergeInClobberRange(LiveIntervals &li_, + SlotIndex Start, + SlotIndex End, BumpPtrAllocator &VNInfoAllocator) { // Find a value # to use for the clobber ranges. If there is already a value# // for unknown values, use it. - VNInfo *ClobberValNo = getUnknownValNo(VNInfoAllocator); + VNInfo *ClobberValNo = + getNextValue(li_.getInvalidIndex(), 0, false, VNInfoAllocator); iterator IP = begin(); IP = std::upper_bound(IP, end(), Start); @@ -640,7 +705,7 @@ VNInfo* LiveInterval::MergeValueNumberInto(VNInfo *V1, VNInfo *V2) { // Make sure V2 is smaller than V1. if (V1->id < V2->id) { - copyValNumInfo(V1, V2); + V1->copyFrom(*V2); std::swap(V1, V2); } @@ -687,24 +752,26 @@ VNInfo* LiveInterval::MergeValueNumberInto(VNInfo *V1, VNInfo *V2) { VNInfo *VNI = valnos.back(); valnos.pop_back(); VNI->~VNInfo(); - } while (valnos.back()->def == ~1U); + } while (valnos.back()->isUnused()); } else { - V1->def = ~1U; + V1->setIsUnused(true); } return V2; } void LiveInterval::Copy(const LiveInterval &RHS, + MachineRegisterInfo *MRI, BumpPtrAllocator &VNInfoAllocator) { ranges.clear(); valnos.clear(); - preference = RHS.preference; + std::pair Hint = MRI->getRegAllocationHint(RHS.reg); + MRI->setRegAllocationHint(reg, Hint.first, Hint.second); + weight = RHS.weight; for (unsigned i = 0, e = RHS.getNumValNums(); i != e; ++i) { const VNInfo *VNI = RHS.getValNumInfo(i); - VNInfo *NewVNI = getNextValue(~0U, 0, VNInfoAllocator); - copyValNumInfo(NewVNI, VNI); + createValueCopy(VNI, VNInfoAllocator); } for (unsigned i = 0, e = RHS.ranges.size(); i != e; ++i) { const LiveRange &LR = RHS.ranges[i]; @@ -715,20 +782,42 @@ void LiveInterval::Copy(const LiveInterval &RHS, unsigned LiveInterval::getSize() const { unsigned Sum = 0; for (const_iterator I = begin(), E = end(); I != E; ++I) - Sum += I->end - I->start; + Sum += I->start.distance(I->end); return Sum; } -std::ostream& llvm::operator<<(std::ostream& os, const LiveRange &LR) { +/// ComputeJoinedWeight - Set the weight of a live interval Joined +/// after Other has been merged into it. +void LiveInterval::ComputeJoinedWeight(const LiveInterval &Other) { + // If either of these intervals was spilled, the weight is the + // weight of the non-spilled interval. This can only happen with + // iterative coalescers. + + if (Other.weight != HUGE_VALF) { + weight += Other.weight; + } + else if (weight == HUGE_VALF && + !TargetRegisterInfo::isPhysicalRegister(reg)) { + // Remove this assert if you have an iterative coalescer + assert(0 && "Joining to spilled interval"); + weight = Other.weight; + } + else { + // Otherwise the weight stays the same + // Remove this assert if you have an iterative coalescer + assert(0 && "Joining from spilled interval"); + } +} + +raw_ostream& llvm::operator<<(raw_ostream& os, const LiveRange &LR) { return os << '[' << LR.start << ',' << LR.end << ':' << LR.valno->id << ")"; } void LiveRange::dump() const { - cerr << *this << "\n"; + dbgs() << *this << "\n"; } -void LiveInterval::print(std::ostream &OS, - const TargetRegisterInfo *TRI) const { +void LiveInterval::print(raw_ostream &OS, const TargetRegisterInfo *TRI) const { if (isStackSlot()) OS << "SS#" << getStackSlotIndex(); else if (TRI && TargetRegisterInfo::isPhysicalRegister(reg)) @@ -756,22 +845,22 @@ void LiveInterval::print(std::ostream &OS, const VNInfo *vni = *i; if (vnum) OS << " "; OS << vnum << "@"; - if (vni->def == ~1U) { + if (vni->isUnused()) { OS << "x"; } else { - if (vni->def == ~0U) + if (!vni->isDefAccurate() && !vni->isPHIDef()) OS << "?"; else OS << vni->def; unsigned ee = vni->kills.size(); - if (ee || vni->hasPHIKill) { + if (ee || vni->hasPHIKill()) { OS << "-("; for (unsigned j = 0; j != ee; ++j) { OS << vni->kills[j]; if (j != ee-1) OS << " "; } - if (vni->hasPHIKill) { + if (vni->hasPHIKill()) { if (ee) OS << " "; OS << "phi"; @@ -784,10 +873,10 @@ void LiveInterval::print(std::ostream &OS, } void LiveInterval::dump() const { - cerr << *this << "\n"; + dbgs() << *this << "\n"; } -void LiveRange::print(std::ostream &os) const { +void LiveRange::print(raw_ostream &os) const { os << *this; }