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Insert empty slots into the instruction numbering in live intervals, so that we can more easily
add new instructions. llvm-svn: 52475
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@ -78,6 +78,7 @@ void LiveIntervals::releaseMemory() {
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void LiveIntervals::computeNumbering() {
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Index2MiMap OldI2MI = i2miMap_;
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std::vector<IdxMBBPair> OldI2MBB = Idx2MBBMap;
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Idx2MBBMap.clear();
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MBB2IdxMap.clear();
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@ -93,19 +94,22 @@ void LiveIntervals::computeNumbering() {
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MBB != E; ++MBB) {
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unsigned StartIdx = MIIndex;
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// Insert an empty slot at the beginning of each block.
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MIIndex += InstrSlots::NUM;
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i2miMap_.push_back(0);
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for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end();
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I != E; ++I) {
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bool inserted = mi2iMap_.insert(std::make_pair(I, MIIndex)).second;
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assert(inserted && "multiple MachineInstr -> index mappings");
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i2miMap_.push_back(I);
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MIIndex += InstrSlots::NUM;
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}
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if (StartIdx == MIIndex) {
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// Empty MBB
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// Insert an empty slot after every instruction.
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MIIndex += InstrSlots::NUM;
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i2miMap_.push_back(0);
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}
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// Set the MBB2IdxMap entry for this MBB.
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MBB2IdxMap[MBB->getNumber()] = std::make_pair(StartIdx, MIIndex - 1);
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Idx2MBBMap.push_back(std::make_pair(StartIdx, MBB));
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@ -113,90 +117,82 @@ void LiveIntervals::computeNumbering() {
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std::sort(Idx2MBBMap.begin(), Idx2MBBMap.end(), Idx2MBBCompare());
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if (!OldI2MI.empty())
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for (iterator I = begin(), E = end(); I != E; ++I)
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for (LiveInterval::iterator LI = I->second.begin(), LE = I->second.end();
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LI != LE; ++LI) {
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for (iterator OI = begin(), OE = end(); OI != OE; ++OI)
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for (LiveInterval::iterator LI = OI->second.begin(),
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LE = OI->second.end(); LI != LE; ++LI) {
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// Remap the start index of the live range to the corresponding new
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// number, or our best guess at what it _should_ correspond to if the
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// original instruction has been erased. This is either the following
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// instruction or its predecessor.
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unsigned index = LI->start / InstrSlots::NUM;
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unsigned offset = LI->start % InstrSlots::NUM;
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if (OldI2MI[LI->start / InstrSlots::NUM])
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LI->start = mi2iMap_[OldI2MI[LI->start / InstrSlots::NUM]] + offset;
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else {
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unsigned i = 0;
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MachineInstr* newInstr = 0;
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do {
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newInstr = OldI2MI[LI->start / InstrSlots::NUM + i];
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i++;
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} while (!newInstr);
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if (offset == InstrSlots::LOAD) {
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std::vector<IdxMBBPair>::const_iterator I =
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std::lower_bound(OldI2MBB.begin(), OldI2MBB.end(), index);
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// Take the pair containing the index
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std::vector<IdxMBBPair>::const_iterator J =
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((I != OldI2MBB.end() && I->first > index) ||
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(I == OldI2MBB.end() && OldI2MBB.size()>0)) ? (I-1): I;
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if (mi2iMap_[newInstr] ==
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MBB2IdxMap[newInstr->getParent()->getNumber()].first)
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LI->start = mi2iMap_[newInstr];
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else
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LI->start = mi2iMap_[newInstr] - InstrSlots::NUM + offset;
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LI->start = getMBBStartIdx(J->second);
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} else {
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LI->start = mi2iMap_[OldI2MI[index]] + offset;
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}
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// Remap the ending index in the same way that we remapped the start,
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// except for the final step where we always map to the immediately
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// following instruction.
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if (LI->end / InstrSlots::NUM < OldI2MI.size()) {
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offset = LI->end % InstrSlots::NUM;
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if (OldI2MI[LI->end / InstrSlots::NUM])
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LI->end = mi2iMap_[OldI2MI[LI->end / InstrSlots::NUM]] + offset;
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else {
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unsigned i = 0;
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MachineInstr* newInstr = 0;
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do {
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newInstr = OldI2MI[LI->end / InstrSlots::NUM + i];
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i++;
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} while (!newInstr);
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LI->end = mi2iMap_[newInstr];
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}
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index = LI->end / InstrSlots::NUM;
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offset = LI->end % InstrSlots::NUM;
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if (offset == InstrSlots::STORE) {
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std::vector<IdxMBBPair>::const_iterator I =
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std::lower_bound(OldI2MBB.begin(), OldI2MBB.end(), index);
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// Take the pair containing the index
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std::vector<IdxMBBPair>::const_iterator J =
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((I != OldI2MBB.end() && I->first > index) ||
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(I == OldI2MBB.end() && OldI2MBB.size()>0)) ? (I-1): I;
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LI->start = getMBBEndIdx(J->second);
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} else {
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LI->end = i2miMap_.size() * InstrSlots::NUM;
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LI->end = mi2iMap_[OldI2MI[index]] + offset;
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}
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// Remap the VNInfo def index, which works the same as the
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// start indices above.
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VNInfo* vni = LI->valno;
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index = vni->def / InstrSlots::NUM;
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offset = vni->def % InstrSlots::NUM;
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if (OldI2MI[vni->def / InstrSlots::NUM])
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vni->def = mi2iMap_[OldI2MI[vni->def / InstrSlots::NUM]] + offset;
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else {
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unsigned i = 0;
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MachineInstr* newInstr = 0;
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do {
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newInstr = OldI2MI[vni->def / InstrSlots::NUM + i];
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i++;
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} while (!newInstr);
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if (offset == InstrSlots::LOAD) {
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std::vector<IdxMBBPair>::const_iterator I =
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std::lower_bound(OldI2MBB.begin(), OldI2MBB.end(), index);
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// Take the pair containing the index
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std::vector<IdxMBBPair>::const_iterator J =
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((I != OldI2MBB.end() && I->first > index) ||
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(I == OldI2MBB.end() && OldI2MBB.size()>0)) ? (I-1): I;
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if (mi2iMap_[newInstr] ==
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MBB2IdxMap[newInstr->getParent()->getNumber()].first)
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vni->def = mi2iMap_[newInstr];
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else
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vni->def = mi2iMap_[newInstr] - InstrSlots::NUM + offset;
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vni->def = getMBBStartIdx(J->second);
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} else {
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vni->def = mi2iMap_[OldI2MI[index]] + offset;
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}
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// Remap the VNInfo kill indices, which works the same as
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// the end indices above.
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for (size_t i = 0; i < vni->kills.size(); ++i) {
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index = vni->kills[i] / InstrSlots::NUM;
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offset = vni->kills[i] % InstrSlots::NUM;
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if (OldI2MI[vni->kills[i] / InstrSlots::NUM])
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vni->kills[i] = mi2iMap_[OldI2MI[vni->kills[i] / InstrSlots::NUM]] +
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offset;
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else {
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unsigned e = 0;
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MachineInstr* newInstr = 0;
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do {
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newInstr = OldI2MI[vni->kills[i] / InstrSlots::NUM + e];
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e++;
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} while (!newInstr);
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vni->kills[i] = mi2iMap_[newInstr];
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if (OldI2MI[vni->kills[i] / InstrSlots::NUM]) {
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std::vector<IdxMBBPair>::const_iterator I =
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std::lower_bound(OldI2MBB.begin(), OldI2MBB.end(), index);
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// Take the pair containing the index
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std::vector<IdxMBBPair>::const_iterator J =
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((I != OldI2MBB.end() && I->first > index) ||
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(I == OldI2MBB.end() && OldI2MBB.size()>0)) ? (I-1): I;
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vni->kills[i] = getMBBEndIdx(J->second);
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} else {
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vni->kills[i] = mi2iMap_[OldI2MI[index]] + offset;
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}
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}
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}
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@ -354,9 +350,7 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
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// of the defining block, potentially live across some blocks, then is
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// live into some number of blocks, but gets killed. Start by adding a
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// range that goes from this definition to the end of the defining block.
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LiveRange NewLR(defIndex,
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getInstructionIndex(&mbb->back()) + InstrSlots::NUM,
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ValNo);
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LiveRange NewLR(defIndex, getMBBEndIdx(mbb), ValNo);
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DOUT << " +" << NewLR;
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interval.addRange(NewLR);
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@ -476,7 +470,7 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
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CopyMI = mi;
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ValNo = interval.getNextValue(defIndex, CopyMI, VNInfoAllocator);
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unsigned killIndex = getInstructionIndex(&mbb->back()) + InstrSlots::NUM;
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unsigned killIndex = getMBBEndIdx(mbb) + 1;
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LiveRange LR(defIndex, killIndex, ValNo);
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interval.addRange(LR);
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interval.addKill(ValNo, killIndex);
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@ -513,8 +507,10 @@ void LiveIntervals::handlePhysicalRegisterDef(MachineBasicBlock *MBB,
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// If it is not dead on definition, it must be killed by a
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// subsequent instruction. Hence its interval is:
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// [defSlot(def), useSlot(kill)+1)
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baseIndex += InstrSlots::NUM;
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while (++mi != MBB->end()) {
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baseIndex += InstrSlots::NUM;
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while (getInstructionFromIndex(baseIndex) == 0)
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baseIndex += InstrSlots::NUM;
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if (mi->killsRegister(interval.reg, tri_)) {
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DOUT << " killed";
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end = getUseIndex(baseIndex) + 1;
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@ -528,6 +524,8 @@ void LiveIntervals::handlePhysicalRegisterDef(MachineBasicBlock *MBB,
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end = getDefIndex(start) + 1;
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goto exit;
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}
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baseIndex += InstrSlots::NUM;
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}
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// The only case we should have a dead physreg here without a killing or
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@ -599,6 +597,8 @@ void LiveIntervals::handleLiveInRegister(MachineBasicBlock *MBB,
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}
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baseIndex += InstrSlots::NUM;
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while (getInstructionFromIndex(baseIndex) == 0)
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baseIndex += InstrSlots::NUM;
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++mi;
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}
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@ -630,6 +630,12 @@ void LiveIntervals::computeIntervals() {
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<< ((Value*)mf_->getFunction())->getName() << '\n';
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// Track the index of the current machine instr.
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unsigned MIIndex = 0;
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// Skip over empty initial indices.
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while (MIIndex / InstrSlots::NUM < i2miMap_.size() &&
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getInstructionFromIndex(MIIndex) == 0)
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MIIndex += InstrSlots::NUM;
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for (MachineFunction::iterator MBBI = mf_->begin(), E = mf_->end();
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MBBI != E; ++MBBI) {
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MachineBasicBlock *MBB = MBBI;
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@ -660,9 +666,12 @@ void LiveIntervals::computeIntervals() {
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}
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MIIndex += InstrSlots::NUM;
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// Skip over empty indices.
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while (MIIndex / InstrSlots::NUM < i2miMap_.size() &&
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getInstructionFromIndex(MIIndex) == 0)
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MIIndex += InstrSlots::NUM;
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}
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if (MBB->begin() == miEnd) MIIndex += InstrSlots::NUM; // Empty MBB
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}
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}
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