//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/LiveInterval.h"
+#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Streams.h"
-#include "llvm/Target/MRegisterInfo.h"
+#include "llvm/Target/TargetRegisterInfo.h"
#include <algorithm>
-#include <map>
#include <ostream>
using namespace llvm;
return r->contains(I);
}
+// 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 {
+ Ranges::const_iterator r = std::upper_bound(ranges.begin(), ranges.end(), I);
+
+ if (r == ranges.begin())
+ return false;
+
+ --r;
+ if (!r->contains(I))
+ return false;
+ if (I != r->start)
+ return true;
+ // I is the start of a live range. Check if the previous live range ends
+ // at I-1.
+ if (r == ranges.begin())
+ return false;
+ return r->end == I;
+}
+
// overlaps - Return true if the intersection of the two live intervals is
// not empty.
//
// Otherwise, if this range ends in the middle of, or right next to, another
// interval, merge it into that interval.
- if (it != ranges.end())
+ if (it != ranges.end()) {
if (LR.valno == it->valno) {
if (it->start <= End) {
it = extendIntervalStartTo(it, Start);
// endpoint as well.
if (End > it->end)
extendIntervalEndTo(it, End);
+ else if (End < it->end)
+ // Overlapping intervals, there might have been a kill here.
+ removeKill(it->valno, End);
return it;
}
} else {
assert(it->start >= End &&
"Cannot overlap two LiveRanges with differing ValID's");
}
+ }
// Otherwise, this is just a new range that doesn't interact with anything.
// Insert it.
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.
-void LiveInterval::removeRange(unsigned Start, unsigned End) {
+/// 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.
Ranges::iterator I = std::upper_bound(ranges.begin(), ranges.end(), Start);
assert(I != ranges.begin() && "Range is not in interval!");
"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);
+ if (RemoveDeadValNo) {
+ // Check if val# is dead.
+ bool isDead = true;
+ for (const_iterator II = begin(), EE = end(); II != EE; ++II)
+ 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()->def == ~1U);
+ } else {
+ ValNo->def = ~1U;
+ }
+ }
+ }
+
ranges.erase(I); // Removed the whole LiveRange.
} else
I->start = End;
// Otherwise if the span we are removing is at the end of the LiveRange,
// adjust the other way.
if (I->end == End) {
- removeKills(I->valno, Start, End);
+ removeKills(ValNo, Start, End);
I->end = Start;
return;
}
I->end = Start; // Trim the old interval.
// Insert the new one.
- ranges.insert(next(I), LiveRange(End, OldEnd, I->valno));
+ ranges.insert(next(I), LiveRange(End, OldEnd, ValNo));
}
+/// removeValNo - Remove all the ranges defined by the specified value#.
+/// Also remove the value# from value# list.
+void LiveInterval::removeValNo(VNInfo *ValNo) {
+ if (empty()) return;
+ Ranges::iterator I = ranges.end();
+ Ranges::iterator E = ranges.begin();
+ do {
+ --I;
+ 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()->def == ~1U);
+ } else {
+ ValNo->def = ~1U;
+ }
+}
+
/// getLiveRangeContaining - Return the live range that contains the
/// specified index, or null if there is none.
LiveInterval::const_iterator
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;
+ for (LiveInterval::const_vni_iterator i = vni_begin(), e = vni_end();
+ i != e; ++i)
+ if ((*i)->def == DefIdxOrReg) {
+ VNI = *i;
+ break;
+ }
+ 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, int *LHSValNoAssignments,
- int *RHSValNoAssignments,
+void LiveInterval::join(LiveInterval &Other, const int *LHSValNoAssignments,
+ const int *RHSValNoAssignments,
SmallVector<VNInfo*, 16> &NewVNInfo) {
// Determine if any of our live range values are mapped. This is uncommon, so
// we want to avoid the interval scan if not.
}
+/// MergeValueInAsValue - Merge all of the live ranges of a specific val#
+/// 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, 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) {
+ SmallVector<VNInfo*, 4> 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;
+ 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 (IP[-1].valno != LHSValNo) {
+ ReplacedValNos.push_back(IP[-1].valno);
+ IP[-1].valno = LHSValNo; // Update val#.
+ }
+ Start = IP[-1].end;
+ // Trimmed away the whole range?
+ if (Start >= End) continue;
+ }
+ // If the end of this range overlaps with an existing liverange, trim it.
+ if (IP != end() && End > IP->start) {
+ if (IP->valno != LHSValNo) {
+ ReplacedValNos.push_back(IP->valno);
+ IP->valno = LHSValNo; // Update val#.
+ }
+ End = IP->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);
+ }
+
+
+ SmallSet<VNInfo*, 4> Seen;
+ for (unsigned i = 0, e = ReplacedValNos.size(); i != e; ++i) {
+ VNInfo *V1 = ReplacedValNos[i];
+ if (Seen.insert(V1)) {
+ bool isDead = true;
+ for (const_iterator I = begin(), E = end(); I != E; ++I)
+ 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()->def == ~1U);
+ } else {
+ V1->def = ~1U;
+ }
+ }
+ }
+ }
+}
+
+
/// 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) {
- if (Clobbers.begin() == Clobbers.end()) return;
+ if (Clobbers.empty()) return;
// Find a value # to use for the clobber ranges. If there is already a value#
// for unknown values, use it.
// ~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()->def == ~1U);
} else {
V1->def = ~1U;
}
}
+void LiveInterval::Copy(const LiveInterval &RHS,
+ BumpPtrAllocator &VNInfoAllocator) {
+ ranges.clear();
+ valnos.clear();
+ preference = RHS.preference;
+ 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);
+ }
+ for (unsigned i = 0, e = RHS.ranges.size(); i != e; ++i) {
+ const LiveRange &LR = RHS.ranges[i];
+ addRange(LiveRange(LR.start, LR.end, getValNumInfo(LR.valno->id)));
+ }
+}
+
unsigned LiveInterval::getSize() const {
unsigned Sum = 0;
for (const_iterator I = begin(), E = end(); I != E; ++I)
cerr << *this << "\n";
}
-void LiveInterval::print(std::ostream &OS, const MRegisterInfo *MRI) const {
- if (MRI && MRegisterInfo::isPhysicalRegister(reg))
- OS << MRI->getName(reg);
+void LiveInterval::print(std::ostream &OS,
+ const TargetRegisterInfo *TRI) const {
+ if (isStackSlot())
+ OS << "SS#" << getStackSlotIndex();
+ else if (TRI && TargetRegisterInfo::isPhysicalRegister(reg))
+ OS << TRI->getName(reg);
else
OS << "%reg" << reg;
OS << ',' << weight;
if (empty())
- OS << "EMPTY";
+ OS << " EMPTY";
else {
OS << " = ";
for (LiveInterval::Ranges::const_iterator I = ranges.begin(),
else
OS << vni->def;
unsigned ee = vni->kills.size();
- if (ee) {
+ 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 (ee)
+ OS << " ";
+ OS << "phi";
+ }
OS << ")";
}
}
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