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Create SUnits directly from the SelectionDAG.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26683 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-03-10 07:13:32 +00:00
parent be24e5996c
commit b2042e31a7
1 changed files with 87 additions and 87 deletions
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174
lib/CodeGen/SelectionDAG/ScheduleDAGList.cpp
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@ -482,128 +482,128 @@ void ScheduleDAGList::BuildSchedUnits() {
// Reserve entries in the vector for each of the SUnits we are creating. This
// ensure that reallocation of the vector won't happen, so SUnit*'s won't get
// invalidated.
SUnits.reserve(NodeCount);
SUnits.reserve(std::distance(DAG.allnodes_begin(), DAG.allnodes_end()));
const InstrItineraryData &InstrItins = TM.getInstrItineraryData();
// Pass 1: create the SUnit's.
for (unsigned i = 0, NC = NodeCount; i < NC; i++) {
NodeInfo *NI = &Info[i];
SDNode *N = NI->Node;
if (isPassiveNode(N))
for (SelectionDAG::allnodes_iterator NI = DAG.allnodes_begin(),
E = DAG.allnodes_end(); NI != E; ++NI) {
if (isPassiveNode(NI)) // Leaf node, e.g. a TargetImmediate.
continue;
// If this node has already been processed, stop now.
if (SUnitMap[NI]) continue;
SUnit *NodeSUnit = NewSUnit(NI);
SUnit *SU;
if (NI->isInGroup()) {
if (NI != NI->Group->getBottom()) // Bottom up, so only look at bottom
continue; // node of the NodeGroup
SU = NewSUnit(N);
// Find the flagged nodes.
SDOperand FlagOp = N->getOperand(N->getNumOperands() - 1);
SDNode *Flag = FlagOp.Val;
unsigned ResNo = FlagOp.ResNo;
while (Flag->getValueType(ResNo) == MVT::Flag) {
NodeInfo *FNI = getNI(Flag);
assert(FNI->Group == NI->Group);
SU->FlaggedNodes.insert(SU->FlaggedNodes.begin(), Flag);
SUnitMap[Flag] = SU;
FlagOp = Flag->getOperand(Flag->getNumOperands() - 1);
Flag = FlagOp.Val;
ResNo = FlagOp.ResNo;
}
} else {
SU = NewSUnit(N);
// See if anything is flagged to this node, if so, add them to flagged
// nodes. Nodes can have at most one flag input and one flag output. Flags
// are required the be the last operand and result of a node.
// Scan up, adding flagged preds to FlaggedNodes.
SDNode *N = NI;
while (N->getNumOperands() &&
N->getOperand(N->getNumOperands()-1).getValueType() == MVT::Flag) {
N = N->getOperand(N->getNumOperands()-1).Val;
NodeSUnit->FlaggedNodes.push_back(N);
SUnitMap[N] = NodeSUnit;
}
SUnitMap[N] = SU;
// Scan down, adding this node and any flagged succs to FlaggedNodes if they
// have a user of the flag operand.
N = NI;
while (N->getValueType(N->getNumValues()-1) == MVT::Flag) {
SDOperand FlagVal(N, N->getNumValues()-1);
// There are either zero or one users of the Flag result.
bool HasFlagUse = false;
for (SDNode::use_iterator UI = N->use_begin(), E = N->use_end();
UI != E; ++UI)
if (FlagVal.isOperand(*UI)) {
HasFlagUse = true;
NodeSUnit->FlaggedNodes.push_back(N);
SUnitMap[N] = NodeSUnit;
N = *UI;
break;
}
if (!HasFlagUse) break;
}
// Now all flagged nodes are in FlaggedNodes and N is the bottom-most node.
// Update the SUnit
NodeSUnit->Node = N;
SUnitMap[N] = NodeSUnit;
// Compute the latency for the node. We use the sum of the latencies for
// all nodes flagged together into this SUnit.
if (InstrItins.isEmpty()) {
// No latency information.
SU->Latency = 1;
NodeSUnit->Latency = 1;
} else {
SU->Latency = 0;
NodeSUnit->Latency = 0;
if (N->isTargetOpcode()) {
unsigned SchedClass = TII->getSchedClass(N->getTargetOpcode());
InstrStage *S = InstrItins.begin(SchedClass);
InstrStage *E = InstrItins.end(SchedClass);
for (; S != E; ++S)
SU->Latency += S->Cycles;
NodeSUnit->Latency += S->Cycles;
}
for (unsigned i = 0, e = SU->FlaggedNodes.size(); i != e; ++i) {
SDNode *FNode = SU->FlaggedNodes[i];
for (unsigned i = 0, e = NodeSUnit->FlaggedNodes.size(); i != e; ++i) {
SDNode *FNode = NodeSUnit->FlaggedNodes[i];
if (FNode->isTargetOpcode()) {
unsigned SchedClass = TII->getSchedClass(FNode->getTargetOpcode());
InstrStage *S = InstrItins.begin(SchedClass);
InstrStage *E = InstrItins.end(SchedClass);
for (; S != E; ++S)
SU->Latency += S->Cycles;
NodeSUnit->Latency += S->Cycles;
}
}
}
}
// Pass 2: add the preds, succs, etc.
for (unsigned i = 0, e = SUnits.size(); i != e; ++i) {
SUnit *SU = &SUnits[i];
SDNode *N = SU->Node;
NodeInfo *NI = getNI(N);
for (unsigned su = 0, e = SUnits.size(); su != e; ++su) {
SUnit *SU = &SUnits[su];
SDNode *MainNode = SU->Node;
if (N->isTargetOpcode() && TII->isTwoAddrInstr(N->getTargetOpcode()))
if (MainNode->isTargetOpcode() &&
TII->isTwoAddrInstr(MainNode->getTargetOpcode()))
SU->isTwoAddress = true;
if (NI->isInGroup()) {
// Find all predecessors (of the group).
NodeGroupOpIterator NGOI(NI);
while (!NGOI.isEnd()) {
SDOperand Op = NGOI.next();
SDNode *OpN = Op.Val;
MVT::ValueType VT = OpN->getValueType(Op.ResNo);
NodeInfo *OpNI = getNI(OpN);
if (OpNI->Group != NI->Group && !isPassiveNode(OpN)) {
assert(VT != MVT::Flag);
SUnit *OpSU = SUnitMap[OpN];
if (VT == MVT::Other) {
if (SU->ChainPreds.insert(OpSU).second)
SU->NumChainPredsLeft++;
if (OpSU->ChainSuccs.insert(SU).second)
OpSU->NumChainSuccsLeft++;
} else {
if (SU->Preds.insert(OpSU).second)
SU->NumPredsLeft++;
if (OpSU->Succs.insert(SU).second)
OpSU->NumSuccsLeft++;
}
}
}
} else {
// Find node predecessors.
for (unsigned j = 0, e = N->getNumOperands(); j != e; j++) {
SDOperand Op = N->getOperand(j);
SDNode *OpN = Op.Val;
MVT::ValueType VT = OpN->getValueType(Op.ResNo);
if (!isPassiveNode(OpN)) {
assert(VT != MVT::Flag);
SUnit *OpSU = SUnitMap[OpN];
if (VT == MVT::Other) {
if (SU->ChainPreds.insert(OpSU).second)
SU->NumChainPredsLeft++;
if (OpSU->ChainSuccs.insert(SU).second)
OpSU->NumChainSuccsLeft++;
} else {
if (SU->Preds.insert(OpSU).second)
SU->NumPredsLeft++;
if (OpSU->Succs.insert(SU).second)
OpSU->NumSuccsLeft++;
if (j == 0 && SU->isTwoAddress)
OpSU->isDefNUseOperand = true;
}
// Find all predecessors and successors of the group.
// Temporarily add N to make code simpler.
SU->FlaggedNodes.push_back(MainNode);
for (unsigned n = 0, e = SU->FlaggedNodes.size(); n != e; ++n) {
SDNode *N = SU->FlaggedNodes[n];
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
SDNode *OpN = N->getOperand(i).Val;
if (isPassiveNode(OpN)) continue; // Not scheduled.
SUnit *OpSU = SUnitMap[OpN];
assert(OpSU && "Node has no SUnit!");
if (OpSU == SU) continue; // In the same group.
MVT::ValueType OpVT = N->getOperand(i).getValueType();
assert(OpVT != MVT::Flag && "Flagged nodes should be in same sunit!");
if (OpVT == MVT::Other) {
if (SU->ChainPreds.insert(OpSU).second)
SU->NumChainPredsLeft++;
if (OpSU->ChainSuccs.insert(SU).second)
OpSU->NumChainSuccsLeft++;
} else {
if (SU->Preds.insert(OpSU).second)
SU->NumPredsLeft++;
if (OpSU->Succs.insert(SU).second)
OpSU->NumSuccsLeft++;
}
}
}
// Remove MainNode from FlaggedNodes again.
SU->FlaggedNodes.pop_back();
DEBUG(SU->dumpAll(&DAG));
}
}