// 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
//===----------------------------------------------------------------------===//
#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/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include <algorithm>
using namespace llvm;
-// Print a LiveIndex to a raw_ostream.
-void LiveIndex::print(raw_ostream &os) const {
- os << (index & ~PHI_BIT);
-}
-
// An example for liveAt():
//
// this = [1,4), liveAt(0) will return false. The instruction defining this
// variable it represents. This is because slot 1 is used (def slot) and spans
// up to slot 3 (store slot).
//
-bool LiveInterval::liveAt(LiveIndex I) const {
+bool LiveInterval::liveAt(SlotIndex I) const {
Ranges::const_iterator r = std::upper_bound(ranges.begin(), ranges.end(), I);
if (r == ranges.begin())
// 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(LiveIndex I) const {
+bool LiveInterval::liveBeforeAndAt(SlotIndex I) const {
Ranges::const_iterator r = std::upper_bound(ranges.begin(), ranges.end(), I);
if (r == ranges.begin())
return r->end == I;
}
+/// killedAt - Return true if a live range ends at index. Note that the kill
+/// point is not contained in the half-open live range. It is usually the
+/// getDefIndex() slot following its last use.
+bool LiveInterval::killedAt(SlotIndex I) const {
+ Ranges::const_iterator r = std::lower_bound(ranges.begin(), ranges.end(), I);
+
+ // Now r points to the first interval with start >= I, or ranges.end().
+ if (r == ranges.begin())
+ return false;
+
+ --r;
+ // Now r points to the last interval with end <= I.
+ // r->end is the kill point.
+ return r->end == I;
+}
+
+/// killedInRange - Return true if the interval has kills in [Start,End).
+bool LiveInterval::killedInRange(SlotIndex Start, SlotIndex End) const {
+ Ranges::const_iterator r =
+ std::lower_bound(ranges.begin(), ranges.end(), End);
+
+ // Now r points to the first interval with start >= End, or ranges.end().
+ if (r == ranges.begin())
+ return false;
+
+ --r;
+ // Now r points to the last interval with end <= End.
+ // r->end is the kill point.
+ return r->end >= Start && r->end < End;
+}
+
// overlaps - Return true if the intersection of the two live intervals is
// not empty.
//
//
bool LiveInterval::overlapsFrom(const LiveInterval& other,
const_iterator StartPos) const {
+ assert(!empty() && "empty interval");
const_iterator i = begin();
const_iterator ie = end();
const_iterator j = StartPos;
/// overlaps - Return true if the live interval overlaps a range specified
/// by [Start, End).
-bool LiveInterval::overlaps(LiveIndex Start, LiveIndex End) const {
+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);
+ const_iterator I = std::lower_bound(begin(), end(), End);
+ return I != begin() && (--I)->end > Start;
+}
+
+
+/// ValNo is dead, remove it. If it is the largest value number, just nuke it
+/// (and any other deleted values neighboring it), otherwise mark it as ~1U so
+/// it can be nuked later.
+void LiveInterval::markValNoForDeletion(VNInfo *ValNo) {
+ if (ValNo->id == getNumValNums()-1) {
+ do {
+ valnos.pop_back();
+ } while (!valnos.empty() && valnos.back()->isUnused());
+ } else {
+ ValNo->setIsUnused(true);
+ }
+}
+
+/// RenumberValues - Renumber all values in order of appearance and delete the
+/// remaining unused values.
+void LiveInterval::RenumberValues(LiveIntervals &lis) {
+ SmallPtrSet<VNInfo*, 8> Seen;
+ bool seenPHIDef = false;
+ valnos.clear();
+ for (const_iterator I = begin(), E = end(); I != E; ++I) {
+ VNInfo *VNI = I->valno;
+ if (!Seen.insert(VNI))
+ continue;
+ assert(!VNI->isUnused() && "Unused valno used by live range");
+ VNI->id = (unsigned)valnos.size();
+ valnos.push_back(VNI);
+ VNI->setHasPHIKill(false);
+ if (VNI->isPHIDef())
+ seenPHIDef = true;
+ }
+
+ // Recompute phi kill flags.
+ if (!seenPHIDef)
+ return;
+ for (const_vni_iterator I = vni_begin(), E = vni_end(); I != E; ++I) {
+ VNInfo *VNI = *I;
+ if (!VNI->isPHIDef())
+ continue;
+ const MachineBasicBlock *PHIBB = lis.getMBBFromIndex(VNI->def);
+ assert(PHIBB && "No basic block for phi-def");
+ for (MachineBasicBlock::const_pred_iterator PI = PHIBB->pred_begin(),
+ PE = PHIBB->pred_end(); PI != PE; ++PI) {
+ VNInfo *KVNI = getVNInfoAt(lis.getMBBEndIdx(*PI).getPrevSlot());
+ if (KVNI)
+ KVNI->setHasPHIKill(true);
+ }
+ }
}
/// 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, LiveIndex NewEnd) {
+void LiveInterval::extendIntervalEndTo(Ranges::iterator I, SlotIndex NewEnd) {
assert(I != ranges.end() && "Not a valid interval!");
VNInfo *ValNo = I->valno;
- LiveIndex OldEnd = I->end;
// Search for the first interval that we can't merge with.
- Ranges::iterator MergeTo = next(I);
+ Ranges::iterator MergeTo = llvm::next(I);
for (; MergeTo != ranges.end() && NewEnd >= MergeTo->end; ++MergeTo) {
assert(MergeTo->valno == ValNo && "Cannot merge with differing values!");
}
I->end = std::max(NewEnd, prior(MergeTo)->end);
// Erase any dead ranges.
- ranges.erase(next(I), MergeTo);
-
- // Update kill info.
- ValNo->removeKills(OldEnd, I->end.prevSlot_());
+ ranges.erase(llvm::next(I), MergeTo);
// 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.
- Ranges::iterator Next = next(I);
+ Ranges::iterator Next = llvm::next(I);
if (Next != ranges.end() && Next->start <= I->end && Next->valno == ValNo) {
I->end = Next->end;
ranges.erase(Next);
/// 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, LiveIndex NewStart) {
+LiveInterval::extendIntervalStartTo(Ranges::iterator I, SlotIndex NewStart) {
assert(I != ranges.end() && "Not a valid interval!");
VNInfo *ValNo = I->valno;
MergeTo->end = I->end;
}
- ranges.erase(next(MergeTo), next(I));
+ ranges.erase(llvm::next(MergeTo), llvm::next(I));
return MergeTo;
}
LiveInterval::iterator
LiveInterval::addRangeFrom(LiveRange LR, iterator From) {
- LiveIndex 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
// endpoint as well.
if (End > it->end)
extendIntervalEndTo(it, End);
- else if (End < it->end)
- // Overlapping intervals, there might have been a kill here.
- it->valno->removeKill(End);
return it;
}
} else {
return ranges.insert(it, LR);
}
-/// isInOneLiveRange - Return true if the range specified is entirely in
+/// isInOneLiveRange - Return true if the range specified is entirely in
/// a single LiveRange of the live interval.
-bool LiveInterval::isInOneLiveRange(LiveIndex Start, LiveIndex 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;
/// removeRange - Remove the specified range from this interval. Note that
/// the range must be in a single LiveRange in its entirety.
-void LiveInterval::removeRange(LiveIndex Start, LiveIndex 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);
VNInfo *ValNo = I->valno;
if (I->start == Start) {
if (I->end == End) {
- ValNo->removeKills(Start, End);
if (RemoveDeadValNo) {
// Check if val# is dead.
bool isDead = true;
if (II != I && II->valno == ValNo) {
isDead = false;
break;
- }
- if (isDead) {
- // Now that ValNo is dead, remove it. If it is the largest value
- // number, just nuke it (and any other deleted values neighboring it),
- // otherwise mark it as ~1U so it can be nuked later.
- if (ValNo->id == getNumValNums()-1) {
- do {
- VNInfo *VNI = valnos.back();
- valnos.pop_back();
- VNI->~VNInfo();
- } while (!valnos.empty() && valnos.back()->isUnused());
- } else {
- ValNo->setIsUnused(true);
}
+ if (isDead) {
+ // Now that ValNo is dead, remove it.
+ markValNoForDeletion(ValNo);
}
}
// Otherwise if the span we are removing is at the end of the LiveRange,
// adjust the other way.
if (I->end == End) {
- ValNo->removeKills(Start, End);
I->end = Start;
return;
}
// Otherwise, we are splitting the LiveRange into two pieces.
- LiveIndex OldEnd = I->end;
+ SlotIndex OldEnd = I->end;
I->end = Start; // Trim the old interval.
// Insert the new one.
- ranges.insert(next(I), LiveRange(End, OldEnd, ValNo));
+ ranges.insert(llvm::next(I), LiveRange(End, OldEnd, ValNo));
}
/// removeValNo - Remove all the ranges defined by the specified value#.
if (I->valno == ValNo)
ranges.erase(I);
} while (I != E);
- // Now that ValNo is dead, remove it. If it is the largest value
- // number, just nuke it (and any other deleted values neighboring it),
- // otherwise mark it as ~1U so it can be nuked later.
- if (ValNo->id == getNumValNums()-1) {
- do {
- VNInfo *VNI = valnos.back();
- valnos.pop_back();
- VNI->~VNInfo();
- } while (!valnos.empty() && valnos.back()->isUnused());
- } else {
- ValNo->setIsUnused(true);
- }
-}
-
-/// scaleNumbering - Renumber VNI and ranges to provide gaps for new
-/// instructions.
-
-void LiveInterval::scaleNumbering(unsigned factor) {
- // Scale ranges.
- for (iterator RI = begin(), RE = end(); RI != RE; ++RI) {
- RI->start = RI->start.scale(factor);
- RI->end = RI->end.scale(factor);
- }
-
- // Scale VNI info.
- for (vni_iterator VNI = vni_begin(), VNIE = vni_end(); VNI != VNIE; ++VNI) {
- VNInfo *vni = *VNI;
-
- if (vni->isDefAccurate())
- vni->def = vni->def.scale(factor);
-
- for (unsigned i = 0; i < vni->kills.size(); ++i) {
- if (!vni->kills[i].isPHIIndex())
- vni->kills[i] = vni->kills[i].scale(factor);
- }
- }
+ // Now that ValNo is dead, remove it.
+ markValNoForDeletion(ValNo);
}
-
/// getLiveRangeContaining - Return the live range that contains the
/// specified index, or null if there is none.
-LiveInterval::const_iterator
-LiveInterval::FindLiveRangeContaining(LiveIndex Idx) const {
+LiveInterval::const_iterator
+LiveInterval::FindLiveRangeContaining(SlotIndex Idx) const {
const_iterator It = std::upper_bound(begin(), end(), Idx);
if (It != ranges.begin()) {
--It;
return end();
}
-LiveInterval::iterator
-LiveInterval::FindLiveRangeContaining(LiveIndex Idx) {
+LiveInterval::iterator
+LiveInterval::FindLiveRangeContaining(SlotIndex Idx) {
iterator It = std::upper_bound(begin(), end(), Idx);
if (It != begin()) {
--It;
if (It->contains(Idx))
return It;
}
-
+
return end();
}
/// findDefinedVNInfo - Find the VNInfo defined by the specified
/// index (register interval).
-VNInfo *LiveInterval::findDefinedVNInfoForRegInt(LiveIndex Idx) const {
+VNInfo *LiveInterval::findDefinedVNInfoForRegInt(SlotIndex Idx) const {
for (LiveInterval::const_vni_iterator i = vni_begin(), e = vni_end();
i != e; ++i) {
if ((*i)->def == Idx)
/// 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,
- const int *RHSValNoAssignments,
+void LiveInterval::join(LiveInterval &Other,
+ const int *LHSValNoAssignments,
+ const int *RHSValNoAssignments,
SmallVector<VNInfo*, 16> &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.
+ // we want to avoid the interval scan if not.
bool MustMapCurValNos = false;
unsigned NumVals = getNumValNums();
unsigned NumNewVals = NewVNInfo.size();
++OutIt;
for (iterator I = OutIt, E = end(); I != E; ++I) {
OutIt->valno = NewVNInfo[LHSValNoAssignments[I->valno->id]];
-
+
// If this live range has the same value # as its immediate predecessor,
// and if they are neighbors, remove one LiveRange. This happens when we
// have [0,3:0)[4,7:1) and map 0/1 onto the same value #.
OutIt->start = I->start;
OutIt->end = I->end;
}
-
+
// Didn't merge, on to the next one.
++OutIt;
}
}
-
+
// If we merge some live ranges, chop off the end.
ranges.erase(OutIt, end());
}
if (VNI) {
if (NumValNos >= NumVals)
valnos.push_back(VNI);
- else
+ else
valnos[NumValNos] = VNI;
VNI->id = NumValNos++; // Renumber val#.
}
}
ComputeJoinedWeight(Other);
-
- // Update regalloc hint if currently there isn't one.
- if (TargetRegisterInfo::isVirtualRegister(reg) &&
- TargetRegisterInfo::isVirtualRegister(Other.reg)) {
- std::pair<unsigned, unsigned> Hint = MRI->getRegAllocationHint(reg);
- if (Hint.first == 0 && Hint.second == 0) {
- std::pair<unsigned, unsigned> 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
/// interval as the specified value number. The LiveRanges in RHS are
/// allowed to overlap with LiveRanges in the current interval, but only if
/// the overlapping LiveRanges have the specified value number.
-void LiveInterval::MergeRangesInAsValue(const LiveInterval &RHS,
+void LiveInterval::MergeRangesInAsValue(const LiveInterval &RHS,
VNInfo *LHSValNo) {
// TODO: Make this more efficient.
iterator InsertPos = begin();
/// 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<VNInfo*, 4> ReplacedValNos;
iterator IP = begin();
for (const_iterator I = RHS.begin(), E = RHS.end(); I != E; ++I) {
+ assert(I->valno == RHS.getValNumInfo(I->valno->id) && "Bad VNInfo");
if (I->valno != RHSValNo)
continue;
- LiveIndex 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) {
// If this trimmed away the whole range, ignore it.
if (Start == End) continue;
}
-
+
// Map the valno in the other live range to the current live range.
IP = addRangeFrom(LiveRange(Start, End, LHSValNo), IP);
}
if (I->valno == V1) {
isDead = false;
break;
- }
- if (isDead) {
- // Now that V1 is dead, remove it. If it is the largest value number,
- // just nuke it (and any other deleted values neighboring it), otherwise
- // mark it as ~1U so it can be nuked later.
- if (V1->id == getNumValNums()-1) {
- do {
- VNInfo *VNI = valnos.back();
- valnos.pop_back();
- VNI->~VNInfo();
- } while (!valnos.empty() && valnos.back()->isUnused());
- } else {
- V1->setIsUnused(true);
}
+ if (isDead) {
+ // Now that V1 is dead, remove it.
+ markValNoForDeletion(V1);
}
}
}
/// 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,
- BumpPtrAllocator &VNInfoAllocator) {
+void LiveInterval::MergeInClobberRanges(LiveIntervals &li_,
+ const LiveInterval &Clobbers,
+ VNInfo::Allocator &VNInfoAllocator) {
if (Clobbers.empty()) return;
-
+
DenseMap<VNInfo*, VNInfo*> ValNoMaps;
VNInfo *UnusedValNo = 0;
iterator IP = begin();
ClobberValNo = UnusedValNo;
else {
UnusedValNo = ClobberValNo =
- getNextValue(LiveIndex(), 0, false, VNInfoAllocator);
+ getNextValue(li_.getInvalidIndex(), 0, false, VNInfoAllocator);
ValNoMaps.insert(std::make_pair(I->valno, ClobberValNo));
}
bool Done = false;
- LiveIndex Start = I->start, End = I->end;
+ 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);
- LiveIndex SubRangeStart = Start;
- LiveIndex SubRangeEnd = End;
+ 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) {
if (UnusedValNo) {
// Delete the last unused val#.
valnos.pop_back();
- UnusedValNo->~VNInfo();
}
}
-void LiveInterval::MergeInClobberRange(LiveIndex Start,
- LiveIndex End,
- BumpPtrAllocator &VNInfoAllocator) {
+void LiveInterval::MergeInClobberRange(LiveIntervals &li_,
+ SlotIndex Start,
+ SlotIndex End,
+ VNInfo::Allocator &VNInfoAllocator) {
// Find a value # to use for the clobber ranges. If there is already a value#
// for unknown values, use it.
VNInfo *ClobberValNo =
- getNextValue(LiveIndex(), 0, false, VNInfoAllocator);
-
+ getNextValue(li_.getInvalidIndex(), 0, false, VNInfoAllocator);
+
iterator IP = begin();
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;
// If this trimmed away the whole range, ignore it.
if (Start == End) return;
}
-
+
// Insert the clobber interval.
addRangeFrom(LiveRange(Start, End, ClobberValNo), IP);
}
for (iterator I = begin(); I != end(); ) {
iterator LR = I++;
if (LR->valno != V1) continue; // Not a V1 LiveRange.
-
+
// Okay, we found a V1 live range. If it had a previous, touching, V2 live
// range, extend it.
if (LR != begin()) {
LR = Prev;
}
}
-
+
// Okay, now we have a V1 or V2 live range that is maximally merged forward.
// Ensure that it is a V2 live-range.
LR->valno = V2;
-
+
// If we can merge it into later V2 live ranges, do so now. We ignore any
// following V1 live ranges, as they will be merged in subsequent iterations
// of the loop.
}
}
}
-
- // Now that V1 is dead, remove it. If it is the largest value number, just
- // nuke it (and any other deleted values neighboring it), otherwise mark it as
- // ~1U so it can be nuked later.
- if (V1->id == getNumValNums()-1) {
- do {
- VNInfo *VNI = valnos.back();
- valnos.pop_back();
- VNI->~VNInfo();
- } while (valnos.back()->isUnused());
- } else {
- V1->setIsUnused(true);
- }
-
+
+ // Now that V1 is dead, remove it.
+ markValNoForDeletion(V1);
+
return V2;
}
void LiveInterval::Copy(const LiveInterval &RHS,
MachineRegisterInfo *MRI,
- BumpPtrAllocator &VNInfoAllocator) {
+ VNInfo::Allocator &VNInfoAllocator) {
ranges.clear();
valnos.clear();
std::pair<unsigned, unsigned> Hint = MRI->getRegAllocationHint(RHS.reg);
}
void LiveRange::dump() const {
- errs() << *this << "\n";
+ dbgs() << *this << "\n";
}
void LiveInterval::print(raw_ostream &OS, const TargetRegisterInfo *TRI) const {
else {
OS << " = ";
for (LiveInterval::Ranges::const_iterator I = ranges.begin(),
- E = ranges.end(); I != E; ++I)
- OS << *I;
+ E = ranges.end(); I != E; ++I) {
+ OS << *I;
+ assert(I->valno == getValNumInfo(I->valno->id) && "Bad VNInfo");
+ }
}
-
+
// Print value number info.
if (getNumValNums()) {
OS << " ";
if (vni->isUnused()) {
OS << "x";
} else {
- if (!vni->isDefAccurate())
+ if (!vni->isDefAccurate() && !vni->isPHIDef())
OS << "?";
else
OS << vni->def;
- unsigned ee = vni->kills.size();
- if (ee || vni->hasPHIKill()) {
- OS << "-(";
- for (unsigned j = 0; j != ee; ++j) {
- OS << vni->kills[j];
- if (vni->kills[j].isPHIIndex())
- OS << "*";
- if (j != ee-1)
- OS << " ";
- }
- if (vni->hasPHIKill()) {
- if (ee)
- OS << " ";
- OS << "phi";
- }
- OS << ")";
- }
+ if (vni->hasPHIKill())
+ OS << "-phikill";
+ if (vni->hasRedefByEC())
+ OS << "-ec";
}
}
}
}
void LiveInterval::dump() const {
- errs() << *this << "\n";
+ dbgs() << *this << "\n";
}
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