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Factor out the SethiUllman numbering logic from the list-burr and
list-tdrr schedulers into a common base class. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59701 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
parent
9e76fea3ab
commit
117f3e9ee4
@ -1209,10 +1209,10 @@ static inline bool isCopyFromLiveIn(const SUnit *SU) {
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N->getOperand(N->getNumOperands()-1).getValueType() != MVT::Flag;
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}
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/// CalcNodeBUSethiUllmanNumber - Compute Sethi Ullman number for bottom up
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/// scheduling. Smaller number is the higher priority.
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/// CalcNodeSethiUllmanNumber - Compute Sethi Ullman number.
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/// Smaller number is the higher priority.
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static unsigned
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CalcNodeBUSethiUllmanNumber(const SUnit *SU, std::vector<unsigned> &SUNumbers) {
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CalcNodeSethiUllmanNumber(const SUnit *SU, std::vector<unsigned> &SUNumbers) {
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unsigned &SethiUllmanNumber = SUNumbers[SU->NodeNum];
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if (SethiUllmanNumber != 0)
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return SethiUllmanNumber;
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@ -1222,7 +1222,7 @@ CalcNodeBUSethiUllmanNumber(const SUnit *SU, std::vector<unsigned> &SUNumbers) {
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I != E; ++I) {
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if (I->isCtrl) continue; // ignore chain preds
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SUnit *PredSU = I->Dep;
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unsigned PredSethiUllman = CalcNodeBUSethiUllmanNumber(PredSU, SUNumbers);
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unsigned PredSethiUllman = CalcNodeSethiUllmanNumber(PredSU, SUNumbers);
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if (PredSethiUllman > SethiUllmanNumber) {
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SethiUllmanNumber = PredSethiUllman;
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Extra = 0;
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@ -1238,47 +1238,6 @@ CalcNodeBUSethiUllmanNumber(const SUnit *SU, std::vector<unsigned> &SUNumbers) {
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return SethiUllmanNumber;
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}
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/// CalcNodeTDSethiUllmanNumber - Compute Sethi Ullman number for top down
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/// scheduling. Smaller number is the higher priority.
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static unsigned
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CalcNodeTDSethiUllmanNumber(const SUnit *SU, std::vector<unsigned> &SUNumbers) {
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unsigned &SethiUllmanNumber = SUNumbers[SU->NodeNum];
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if (SethiUllmanNumber != 0)
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return SethiUllmanNumber;
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unsigned Opc = SU->getNode() ? SU->getNode()->getOpcode() : 0;
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if (Opc == ISD::TokenFactor || Opc == ISD::CopyToReg)
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SethiUllmanNumber = 0xffff;
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else if (SU->NumSuccsLeft == 0)
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// If SU does not have a use, i.e. it doesn't produce a value that would
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// be consumed (e.g. store), then it terminates a chain of computation.
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// Give it a small SethiUllman number so it will be scheduled right before
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// its predecessors that it doesn't lengthen their live ranges.
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SethiUllmanNumber = 0;
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else if (SU->NumPredsLeft == 0 &&
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(Opc != ISD::CopyFromReg || isCopyFromLiveIn(SU)))
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SethiUllmanNumber = 0xffff;
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else {
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int Extra = 0;
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for (SUnit::const_pred_iterator I = SU->Preds.begin(), E = SU->Preds.end();
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I != E; ++I) {
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if (I->isCtrl) continue; // ignore chain preds
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SUnit *PredSU = I->Dep;
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unsigned PredSethiUllman = CalcNodeTDSethiUllmanNumber(PredSU, SUNumbers);
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if (PredSethiUllman > SethiUllmanNumber) {
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SethiUllmanNumber = PredSethiUllman;
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Extra = 0;
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} else if (PredSethiUllman == SethiUllmanNumber && !I->isCtrl)
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++Extra;
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}
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SethiUllmanNumber += Extra;
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}
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return SethiUllmanNumber;
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}
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namespace {
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template<class SF>
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class VISIBILITY_HIDDEN RegReductionPriorityQueue
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@ -1294,6 +1253,9 @@ namespace {
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const TargetRegisterInfo *TRI;
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ScheduleDAGRRList *scheduleDAG;
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// SethiUllmanNumbers - The SethiUllman number for each node.
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std::vector<unsigned> SethiUllmanNumbers;
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public:
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RegReductionPriorityQueue(const TargetInstrInfo *tii,
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const TargetRegisterInfo *tri) :
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@ -1302,17 +1264,59 @@ namespace {
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void initNodes(std::vector<SUnit> &sunits) {
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SUnits = &sunits;
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// Add pseudo dependency edges for two-address nodes.
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AddPseudoTwoAddrDeps();
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// Calculate node priorities.
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CalculateSethiUllmanNumbers();
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}
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virtual void addNode(const SUnit *SU) = 0;
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void addNode(const SUnit *SU) {
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unsigned SUSize = SethiUllmanNumbers.size();
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if (SUnits->size() > SUSize)
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SethiUllmanNumbers.resize(SUSize*2, 0);
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CalcNodeSethiUllmanNumber(SU, SethiUllmanNumbers);
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}
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virtual void updateNode(const SUnit *SU) = 0;
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void updateNode(const SUnit *SU) {
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SethiUllmanNumbers[SU->NodeNum] = 0;
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CalcNodeSethiUllmanNumber(SU, SethiUllmanNumbers);
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}
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virtual void releaseState() {
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void releaseState() {
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SUnits = 0;
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SethiUllmanNumbers.clear();
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}
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unsigned getNodePriority(const SUnit *SU) const {
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assert(SU->NodeNum < SethiUllmanNumbers.size());
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unsigned Opc = SU->getNode() ? SU->getNode()->getOpcode() : 0;
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if (Opc == ISD::CopyFromReg && !isCopyFromLiveIn(SU))
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// CopyFromReg should be close to its def because it restricts
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// allocation choices. But if it is a livein then perhaps we want it
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// closer to its uses so it can be coalesced.
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return 0xffff;
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else if (Opc == ISD::TokenFactor || Opc == ISD::CopyToReg)
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// CopyToReg should be close to its uses to facilitate coalescing and
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// avoid spilling.
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return 0;
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else if (Opc == TargetInstrInfo::EXTRACT_SUBREG ||
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Opc == TargetInstrInfo::INSERT_SUBREG)
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// EXTRACT_SUBREG / INSERT_SUBREG should be close to its use to
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// facilitate coalescing.
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return 0;
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else if (SU->NumSuccs == 0)
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// If SU does not have a use, i.e. it doesn't produce a value that would
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// be consumed (e.g. store), then it terminates a chain of computation.
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// Give it a large SethiUllman number so it will be scheduled right
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// before its predecessors that it doesn't lengthen their live ranges.
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return 0xffff;
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else if (SU->NumPreds == 0)
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// If SU does not have a def, schedule it close to its uses because it
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// does not lengthen any live ranges.
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return 0;
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else
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return SethiUllmanNumbers[SU->NodeNum];
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}
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virtual unsigned getNodePriority(const SUnit *SU) const = 0;
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unsigned size() const { return Queue.size(); }
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@ -1351,122 +1355,14 @@ namespace {
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protected:
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bool canClobber(const SUnit *SU, const SUnit *Op);
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void AddPseudoTwoAddrDeps();
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};
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class VISIBILITY_HIDDEN BURegReductionPriorityQueue
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: public RegReductionPriorityQueue<bu_ls_rr_sort> {
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// SethiUllmanNumbers - The SethiUllman number for each node.
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std::vector<unsigned> SethiUllmanNumbers;
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public:
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BURegReductionPriorityQueue(const TargetInstrInfo *tii,
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const TargetRegisterInfo *tri)
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: RegReductionPriorityQueue<bu_ls_rr_sort>(tii, tri) {}
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void initNodes(std::vector<SUnit> &sunits) {
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RegReductionPriorityQueue<bu_ls_rr_sort>::initNodes(sunits);
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// Add pseudo dependency edges for two-address nodes.
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AddPseudoTwoAddrDeps();
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// Calculate node priorities.
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CalculateSethiUllmanNumbers();
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}
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void addNode(const SUnit *SU) {
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unsigned SUSize = SethiUllmanNumbers.size();
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if (SUnits->size() > SUSize)
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SethiUllmanNumbers.resize(SUSize*2, 0);
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CalcNodeBUSethiUllmanNumber(SU, SethiUllmanNumbers);
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}
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void updateNode(const SUnit *SU) {
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SethiUllmanNumbers[SU->NodeNum] = 0;
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CalcNodeBUSethiUllmanNumber(SU, SethiUllmanNumbers);
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}
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void releaseState() {
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RegReductionPriorityQueue<bu_ls_rr_sort>::releaseState();
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SethiUllmanNumbers.clear();
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}
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unsigned getNodePriority(const SUnit *SU) const {
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assert(SU->NodeNum < SethiUllmanNumbers.size());
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unsigned Opc = SU->getNode() ? SU->getNode()->getOpcode() : 0;
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if (Opc == ISD::CopyFromReg && !isCopyFromLiveIn(SU))
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// CopyFromReg should be close to its def because it restricts
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// allocation choices. But if it is a livein then perhaps we want it
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// closer to its uses so it can be coalesced.
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return 0xffff;
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else if (Opc == ISD::TokenFactor || Opc == ISD::CopyToReg)
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// CopyToReg should be close to its uses to facilitate coalescing and
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// avoid spilling.
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return 0;
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else if (Opc == TargetInstrInfo::EXTRACT_SUBREG ||
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Opc == TargetInstrInfo::INSERT_SUBREG)
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// EXTRACT_SUBREG / INSERT_SUBREG should be close to its use to
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// facilitate coalescing.
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return 0;
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else if (SU->NumSuccs == 0)
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// If SU does not have a use, i.e. it doesn't produce a value that would
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// be consumed (e.g. store), then it terminates a chain of computation.
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// Give it a large SethiUllman number so it will be scheduled right
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// before its predecessors that it doesn't lengthen their live ranges.
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return 0xffff;
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else if (SU->NumPreds == 0)
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// If SU does not have a def, schedule it close to its uses because it
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// does not lengthen any live ranges.
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return 0;
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else
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return SethiUllmanNumbers[SU->NodeNum];
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}
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private:
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void CalculateSethiUllmanNumbers();
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};
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typedef RegReductionPriorityQueue<bu_ls_rr_sort>
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BURegReductionPriorityQueue;
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class VISIBILITY_HIDDEN TDRegReductionPriorityQueue
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: public RegReductionPriorityQueue<td_ls_rr_sort> {
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// SethiUllmanNumbers - The SethiUllman number for each node.
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std::vector<unsigned> SethiUllmanNumbers;
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public:
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TDRegReductionPriorityQueue(const TargetInstrInfo *tii,
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const TargetRegisterInfo *tri)
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: RegReductionPriorityQueue<td_ls_rr_sort>(tii, tri) {}
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void initNodes(std::vector<SUnit> &sunits) {
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RegReductionPriorityQueue<td_ls_rr_sort>::initNodes(sunits);
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// Add pseudo dependency edges for two-address nodes.
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AddPseudoTwoAddrDeps();
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// Calculate node priorities.
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CalculateSethiUllmanNumbers();
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}
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void addNode(const SUnit *SU) {
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unsigned SUSize = SethiUllmanNumbers.size();
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if (SUnits->size() > SUSize)
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SethiUllmanNumbers.resize(SUSize*2, 0);
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CalcNodeTDSethiUllmanNumber(SU, SethiUllmanNumbers);
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}
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void updateNode(const SUnit *SU) {
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SethiUllmanNumbers[SU->NodeNum] = 0;
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CalcNodeTDSethiUllmanNumber(SU, SethiUllmanNumbers);
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}
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void releaseState() {
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RegReductionPriorityQueue<td_ls_rr_sort>::releaseState();
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SethiUllmanNumbers.clear();
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}
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unsigned getNodePriority(const SUnit *SU) const {
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assert(SU->NodeNum < SethiUllmanNumbers.size());
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return SethiUllmanNumbers[SU->NodeNum];
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}
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private:
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void CalculateSethiUllmanNumbers();
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};
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typedef RegReductionPriorityQueue<td_ls_rr_sort>
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TDRegReductionPriorityQueue;
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}
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/// closestSucc - Returns the scheduled cycle of the successor which is
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@ -1701,11 +1597,12 @@ void RegReductionPriorityQueue<SF>::AddPseudoTwoAddrDeps() {
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/// CalculateSethiUllmanNumbers - Calculate Sethi-Ullman numbers of all
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/// scheduling units.
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void BURegReductionPriorityQueue::CalculateSethiUllmanNumbers() {
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template<class SF>
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void RegReductionPriorityQueue<SF>::CalculateSethiUllmanNumbers() {
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SethiUllmanNumbers.assign(SUnits->size(), 0);
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for (unsigned i = 0, e = SUnits->size(); i != e; ++i)
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CalcNodeBUSethiUllmanNumber(&(*SUnits)[i], SethiUllmanNumbers);
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CalcNodeSethiUllmanNumber(&(*SUnits)[i], SethiUllmanNumbers);
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}
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/// LimitedSumOfUnscheduledPredsOfSuccs - Compute the sum of the unscheduled
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@ -1771,15 +1668,6 @@ bool td_ls_rr_sort::operator()(const SUnit *left, const SUnit *right) const {
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return (left->NodeQueueId > right->NodeQueueId);
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}
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/// CalculateSethiUllmanNumbers - Calculate Sethi-Ullman numbers of all
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/// scheduling units.
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void TDRegReductionPriorityQueue::CalculateSethiUllmanNumbers() {
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SethiUllmanNumbers.assign(SUnits->size(), 0);
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for (unsigned i = 0, e = SUnits->size(); i != e; ++i)
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CalcNodeTDSethiUllmanNumber(&(*SUnits)[i], SethiUllmanNumbers);
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}
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//===----------------------------------------------------------------------===//
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// Public Constructor Functions
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//===----------------------------------------------------------------------===//
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