//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/LiveInterval.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"
return false;
}
+/// overlaps - Return true if the live interval overlaps a range specified
+/// by [Start, End).
+bool LiveInterval::overlaps(unsigned Start, unsigned 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
return ranges.insert(it, LR);
}
+/// isInOneLiveRange - Return true if the range specified is entirely in the
+/// a single LiveRange of the live interval.
+bool LiveInterval::isInOneLiveRange(unsigned Start, unsigned 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);
+}
+
/// removeRange - Remove the specified range from this interval. Note that
-/// the range must already be in this interval in its entirety.
+/// the range must be in a single LiveRange in its entirety.
void LiveInterval::removeRange(unsigned Start, unsigned End,
bool RemoveDeadValNo) {
// Find the LiveRange containing this span.
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);
}
}
}
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);
}
}
+/// 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 = InstrSlots::scale(RI->start, factor);
+ RI->end = InstrSlots::scale(RI->end, factor);
+ }
+
+ // Scale VNI info.
+ for (vni_iterator VNI = vni_begin(), VNIE = vni_end(); VNI != VNIE; ++VNI) {
+ VNInfo *vni = *VNI;
+
+ if (vni->isDefAccurate())
+ vni->def = InstrSlots::scale(vni->def, factor);
+
+ for (unsigned i = 0; i < vni->kills.size(); ++i) {
+ if (!vni->kills[i].isPHIKill)
+ vni->kills[i].killIdx =
+ InstrSlots::scale(vni->kills[i].killIdx, factor);
+ }
+ }
+}
+
/// getLiveRangeContaining - Return the live range that contains the
/// specified index, or null if there is none.
LiveInterval::const_iterator
return VNI;
}
-
/// 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,
- SmallVector<VNInfo*, 16> &NewVNInfo) {
+ 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.
bool MustMapCurValNos = false;
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;
}
weight += Other.weight;
- if (Other.preference && !preference)
- preference = Other.preference;
+
+ // 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
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);
}
}
}
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.
- // FIXME: Use a single sentinal number for these!
- VNInfo *ClobberValNo = getNextValue(~0U, 0, VNInfoAllocator);
-
+ DenseMap<VNInfo*, VNInfo*> 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<VNInfo*, VNInfo*>::iterator VI = ValNoMaps.find(I->valno);
+ if (VI != ValNoMaps.end())
+ ClobberValNo = VI->second;
+ else if (UnusedValNo)
+ ClobberValNo = UnusedValNo;
+ else {
+ UnusedValNo = ClobberValNo = getNextValue(0, 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;
+ unsigned 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);
+ unsigned SubRangeStart = Start;
+ unsigned 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;
}
+ }
+
+ if (UnusedValNo) {
+ // Delete the last unused val#.
+ valnos.pop_back();
+ UnusedValNo->~VNInfo();
+ }
+}
+
+void LiveInterval::MergeInClobberRange(unsigned Start, unsigned 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 = getNextValue(0, 0, false, VNInfoAllocator);
+
+ iterator IP = begin();
+ IP = std::upper_bound(IP, end(), Start);
- // Insert the clobber interval.
- IP = addRangeFrom(LiveRange(Start, End, ClobberValNo), IP);
+ // 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) return;
+ }
+ // 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) return;
}
+
+ // Insert the clobber interval.
+ addRangeFrom(LiveRange(Start, End, ClobberValNo), IP);
}
/// MergeValueNumberInto - This method is called when two value nubmers
/// are found to be equivalent. This eliminates V1, replacing all
/// LiveRanges with the V1 value number with the V2 value number. This can
/// cause merging of V1/V2 values numbers and compaction of the value space.
-void LiveInterval::MergeValueNumberInto(VNInfo *V1, VNInfo *V2) {
+VNInfo* LiveInterval::MergeValueNumberInto(VNInfo *V1, VNInfo *V2) {
assert(V1 != V2 && "Identical value#'s are always equivalent!");
// This code actually merges the (numerically) larger value number into the
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<unsigned, unsigned> 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];
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())
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];
+ OS << vni->kills[j].killIdx;
+ if (vni->kills[j].isPHIKill)
+ OS << "*";
if (j != ee-1)
OS << " ";
}
- if (vni->hasPHIKill) {
+ if (vni->hasPHIKill()) {
if (ee)
OS << " ";
OS << "phi";
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