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path: root/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
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-rw-r--r--lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp151
1 files changed, 132 insertions, 19 deletions
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
index ff751a9444..0575b41d1f 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
@@ -34,6 +34,7 @@
using namespace llvm;
STATISTIC(NumBacktracks, "Number of times scheduler backtraced");
+STATISTIC(NumUnfolds, "Number of nodes unfolded");
STATISTIC(NumDups, "Number of duplicated nodes");
STATISTIC(NumCCCopies, "Number of cross class copies");
@@ -385,32 +386,145 @@ void ScheduleDAGRRList::BacktrackBottomUp(SUnit *SU, unsigned BtCycle,
++NumBacktracks;
}
-/// isSafeToCopy - True if the SUnit for the given SDNode can safely cloned,
-/// i.e. the node does not produce a flag, it does not read a flag and it does
-/// not have an incoming chain.
-static bool isSafeToCopy(SDNode *N) {
+/// CopyAndMoveSuccessors - Clone the specified node and move its scheduled
+/// successors to the newly created node.
+SUnit *ScheduleDAGRRList::CopyAndMoveSuccessors(SUnit *SU) {
+ if (SU->FlaggedNodes.size())
+ return NULL;
+
+ SDNode *N = SU->Node;
if (!N)
- return true;
+ return NULL;
+ SUnit *NewSU;
for (unsigned i = 0, e = N->getNumValues(); i != e; ++i)
if (N->getValueType(i) == MVT::Flag)
- return false;
+ return NULL;
+ bool TryUnfold = false;
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
const SDOperand &Op = N->getOperand(i);
MVT::ValueType VT = Op.Val->getValueType(Op.ResNo);
- if (VT == MVT::Other || VT == MVT::Flag)
- return false;
+ if (VT == MVT::Flag)
+ return NULL;
+ else if (VT == MVT::Other)
+ TryUnfold = true;
}
- return true;
-}
+ if (TryUnfold) {
+ SmallVector<SDNode*, 4> NewNodes;
+ if (!MRI->unfoldMemoryOperand(DAG, N, NewNodes))
+ return NULL;
+
+ DOUT << "Unfolding SU # " << SU->NodeNum << "\n";
+ assert(NewNodes.size() == 2 && "Expected a load folding node!");
+
+ N = NewNodes[1];
+ SDNode *LoadNode = NewNodes[0];
+ std::vector<SDNode*> Deleted;
+ unsigned NumVals = N->getNumValues();
+ unsigned OldNumVals = SU->Node->getNumValues();
+ for (unsigned i = 0; i != NumVals; ++i)
+ DAG.ReplaceAllUsesOfValueWith(SDOperand(SU->Node, i),
+ SDOperand(N, i), Deleted);
+ DAG.ReplaceAllUsesOfValueWith(SDOperand(SU->Node, OldNumVals-1),
+ SDOperand(LoadNode, 1), Deleted);
+
+ SUnit *LoadSU = NewSUnit(LoadNode);
+ SUnit *NewSU = NewSUnit(N);
+ SUnitMap[LoadNode].push_back(LoadSU);
+ SUnitMap[N].push_back(NewSU);
+ const TargetInstrDescriptor *TID = &TII->get(LoadNode->getTargetOpcode());
+ for (unsigned i = 0; i != TID->numOperands; ++i) {
+ if (TID->getOperandConstraint(i, TOI::TIED_TO) != -1) {
+ LoadSU->isTwoAddress = true;
+ break;
+ }
+ }
+ if (TID->Flags & M_COMMUTABLE)
+ LoadSU->isCommutable = true;
-/// CopyAndMoveSuccessors - Clone the specified node and move its scheduled
-/// successors to the newly created node.
-SUnit *ScheduleDAGRRList::CopyAndMoveSuccessors(SUnit *SU) {
- DOUT << "Duplicating SU # " << SU->NodeNum << "\n";
+ TID = &TII->get(N->getTargetOpcode());
+ for (unsigned i = 0; i != TID->numOperands; ++i) {
+ if (TID->getOperandConstraint(i, TOI::TIED_TO) != -1) {
+ NewSU->isTwoAddress = true;
+ break;
+ }
+ }
+ if (TID->Flags & M_COMMUTABLE)
+ NewSU->isCommutable = true;
+
+ // FIXME: Calculate height / depth and propagate the changes?
+ LoadSU->Depth = NewSU->Depth = SU->Depth;
+ LoadSU->Height = NewSU->Height = SU->Height;
+ ComputeLatency(LoadSU);
+ ComputeLatency(NewSU);
+
+ SUnit *ChainPred = NULL;
+ SmallVector<SDep, 4> ChainSuccs;
+ SmallVector<SDep, 4> LoadPreds;
+ SmallVector<SDep, 4> NodePreds;
+ SmallVector<SDep, 4> NodeSuccs;
+ for (SUnit::pred_iterator I = SU->Preds.begin(), E = SU->Preds.end();
+ I != E; ++I) {
+ if (I->isCtrl)
+ ChainPred = I->Dep;
+ else if (I->Dep->Node && I->Dep->Node->isOperand(LoadNode))
+ LoadPreds.push_back(SDep(I->Dep, I->Reg, I->Cost, false, false));
+ else
+ NodePreds.push_back(SDep(I->Dep, I->Reg, I->Cost, false, false));
+ }
+ for (SUnit::succ_iterator I = SU->Succs.begin(), E = SU->Succs.end();
+ I != E; ++I) {
+ if (I->isCtrl)
+ ChainSuccs.push_back(SDep(I->Dep, I->Reg, I->Cost,
+ I->isCtrl, I->isSpecial));
+ else
+ NodeSuccs.push_back(SDep(I->Dep, I->Reg, I->Cost,
+ I->isCtrl, I->isSpecial));
+ }
- SUnit *NewSU = Clone(SU);
+ SU->removePred(ChainPred, true, false);
+ LoadSU->addPred(ChainPred, true, false);
+ for (unsigned i = 0, e = LoadPreds.size(); i != e; ++i) {
+ SDep *Pred = &LoadPreds[i];
+ SU->removePred(Pred->Dep, Pred->isCtrl, Pred->isSpecial);
+ LoadSU->addPred(Pred->Dep, Pred->isCtrl, Pred->isSpecial,
+ Pred->Reg, Pred->Cost);
+ }
+ for (unsigned i = 0, e = NodePreds.size(); i != e; ++i) {
+ SDep *Pred = &NodePreds[i];
+ SU->removePred(Pred->Dep, Pred->isCtrl, Pred->isSpecial);
+ NewSU->addPred(Pred->Dep, Pred->isCtrl, Pred->isSpecial,
+ Pred->Reg, Pred->Cost);
+ }
+ for (unsigned i = 0, e = NodeSuccs.size(); i != e; ++i) {
+ SDep *Succ = &NodeSuccs[i];
+ Succ->Dep->removePred(SU, Succ->isCtrl, Succ->isSpecial);
+ Succ->Dep->addPred(NewSU, Succ->isCtrl, Succ->isSpecial,
+ Succ->Reg, Succ->Cost);
+ }
+ for (unsigned i = 0, e = ChainSuccs.size(); i != e; ++i) {
+ SDep *Succ = &ChainSuccs[i];
+ Succ->Dep->removePred(SU, Succ->isCtrl, Succ->isSpecial);
+ Succ->Dep->addPred(LoadSU, Succ->isCtrl, Succ->isSpecial,
+ Succ->Reg, Succ->Cost);
+ }
+ NewSU->addPred(LoadSU, false, false);
+
+ AvailableQueue->addNode(LoadSU);
+ AvailableQueue->addNode(NewSU);
+
+ ++NumUnfolds;
+
+ if (NewSU->NumSuccsLeft == 0) {
+ NewSU->isAvailable = true;
+ return NewSU;
+ } else
+ SU = NewSU;
+ }
+
+ DOUT << "Duplicating SU # " << SU->NodeNum << "\n";
+ NewSU = Clone(SU);
// New SUnit has the exact same predecessors.
for (SUnit::pred_iterator I = SU->Preds.begin(), E = SU->Preds.end();
@@ -452,6 +566,7 @@ void ScheduleDAGRRList::InsertCCCopiesAndMoveSuccs(SUnit *SU, unsigned Reg,
const TargetRegisterClass *DestRC,
const TargetRegisterClass *SrcRC,
SmallVector<SUnit*, 2> &Copies) {
+ abort();
SUnit *CopyFromSU = NewSUnit(NULL);
CopyFromSU->CopySrcRC = SrcRC;
CopyFromSU->CopyDstRC = DestRC;
@@ -640,10 +755,8 @@ void ScheduleDAGRRList::ListScheduleBottomUp() {
assert(LRegs.size() == 1 && "Can't handle this yet!");
unsigned Reg = LRegs[0];
SUnit *LRDef = LiveRegDefs[Reg];
- SUnit *NewDef;
- if (isSafeToCopy(LRDef->Node))
- NewDef = CopyAndMoveSuccessors(LRDef);
- else {
+ SUnit *NewDef = CopyAndMoveSuccessors(LRDef);
+ if (!NewDef) {
// Issue expensive cross register class copies.
MVT::ValueType VT = getPhysicalRegisterVT(LRDef->Node, Reg, TII);
const TargetRegisterClass *RC =
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-09-01 12:13:09 +0000