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Use struct SDep instead of std::pair for SUnit pred and succ lists. First step

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in tracking physical register output dependencies.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42125 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-09-19 01:38:40 +00:00
parent dcfa73fe3c
commit 713a98dee8
5 changed files with 63 additions and 53 deletions

44
include/llvm/CodeGen/ScheduleDAG.h

@ -22,6 +22,7 @@
namespace llvm {
struct InstrStage;
struct SUnit;
class MachineConstantPool;
class MachineModuleInfo;
class MachineInstr;
@ -74,7 +75,18 @@ namespace llvm {
virtual void EmitNoop() {
}
};
/// SDep - Scheduling dependency. It keeps track of dependent nodes,
/// cost of the depdenency, etc.
struct SDep {
SUnit *Dep; // Dependent - either a predecessor or a successor.
bool isCtrl; // True iff it's a control dependency.
unsigned PhyReg; // If non-zero, this dep is a phy register dependency.
int Cost; // Cost of the dependency.
SDep(SUnit *d, bool c, unsigned r, int t)
: Dep(d), isCtrl(c), PhyReg(r), Cost(t) {}
};
/// SUnit - Scheduling unit. It's an wrapper around either a single SDNode or
/// a group of nodes flagged together.
struct SUnit {
@ -83,15 +95,13 @@ namespace llvm {
// Preds/Succs - The SUnits before/after us in the graph. The boolean value
// is true if the edge is a token chain edge, false if it is a value edge.
SmallVector<std::pair<SUnit*,bool>, 4> Preds; // All sunit predecessors.
SmallVector<std::pair<SUnit*,bool>, 4> Succs; // All sunit successors.
SmallVector<SDep, 4> Preds; // All sunit predecessors.
SmallVector<SDep, 4> Succs; // All sunit successors.
typedef SmallVector<std::pair<SUnit*,bool>, 4>::iterator pred_iterator;
typedef SmallVector<std::pair<SUnit*,bool>, 4>::iterator succ_iterator;
typedef SmallVector<std::pair<SUnit*,bool>, 4>::const_iterator
const_pred_iterator;
typedef SmallVector<std::pair<SUnit*,bool>, 4>::const_iterator
const_succ_iterator;
typedef SmallVector<SDep, 4>::iterator pred_iterator;
typedef SmallVector<SDep, 4>::iterator succ_iterator;
typedef SmallVector<SDep, 4>::const_iterator const_pred_iterator;
typedef SmallVector<SDep, 4>::const_iterator const_succ_iterator;
short NumPreds; // # of preds.
short NumSuccs; // # of sucss.
@ -121,21 +131,21 @@ namespace llvm {
/// addPred - This adds the specified node as a pred of the current node if
/// not already. This returns true if this is a new pred.
bool addPred(SUnit *N, bool isChain) {
bool addPred(SUnit *N, bool isCtrl, unsigned PhyReg = 0, int Cost = 1) {
for (unsigned i = 0, e = Preds.size(); i != e; ++i)
if (Preds[i].first == N && Preds[i].second == isChain)
if (Preds[i].Dep == N && Preds[i].isCtrl == isCtrl)
return false;
Preds.push_back(std::make_pair(N, isChain));
Preds.push_back(SDep(N, isCtrl, PhyReg, Cost));
return true;
}
/// addSucc - This adds the specified node as a succ of the current node if
/// not already. This returns true if this is a new succ.
bool addSucc(SUnit *N, bool isChain) {
bool addSucc(SUnit *N, bool isCtrl, unsigned PhyReg = 0, int Cost = 1) {
for (unsigned i = 0, e = Succs.size(); i != e; ++i)
if (Succs[i].first == N && Succs[i].second == isChain)
if (Succs[i].Dep == N && Succs[i].isCtrl == isCtrl)
return false;
Succs.push_back(std::make_pair(N, isChain));
Succs.push_back(SDep(N, isCtrl, PhyReg, Cost));
return true;
}
@ -340,7 +350,7 @@ namespace llvm {
}
pointer operator*() const {
return Node->Preds[Operand].first;
return Node->Preds[Operand].Dep;
}
pointer operator->() const { return operator*(); }
@ -359,7 +369,7 @@ namespace llvm {
unsigned getOperand() const { return Operand; }
const SUnit *getNode() const { return Node; }
bool isChain() const { return Node->Preds[Operand].second; }
bool isCtrlDep() const { return Node->Preds[Operand].isCtrl; }
};
template <> struct GraphTraits<SUnit*> {

12
lib/CodeGen/SelectionDAG/ScheduleDAG.cpp

@ -193,7 +193,7 @@ void ScheduleDAG::CalculateDepths() {
SU->Depth = Depth;
for (SUnit::succ_iterator I = SU->Succs.begin(), E = SU->Succs.end();
I != E; ++I)
WorkList.push_back(std::make_pair(I->first, Depth+1));
WorkList.push_back(std::make_pair(I->Dep, Depth+1));
}
}
}
@ -211,7 +211,7 @@ void ScheduleDAG::CalculateHeights() {
SU->Height = Height;
for (SUnit::pred_iterator I = SU->Preds.begin(), E = SU->Preds.end();
I != E; ++I)
WorkList.push_back(std::make_pair(I->first, Height+1));
WorkList.push_back(std::make_pair(I->Dep, Height+1));
}
}
}
@ -865,22 +865,22 @@ void SUnit::dumpAll(const SelectionDAG *G) const {
cerr << " Predecessors:\n";
for (SUnit::const_succ_iterator I = Preds.begin(), E = Preds.end();
I != E; ++I) {
if (I->second)
if (I->isCtrl)
cerr << " ch #";
else
cerr << " val #";
cerr << I->first << " - SU(" << I->first->NodeNum << ")\n";
cerr << I->Dep << " - SU(" << I->Dep->NodeNum << ")\n";
}
}
if (Succs.size() != 0) {
cerr << " Successors:\n";
for (SUnit::const_succ_iterator I = Succs.begin(), E = Succs.end();
I != E; ++I) {
if (I->second)
if (I->isCtrl)
cerr << " ch #";
else
cerr << " val #";
cerr << I->first << " - SU(" << I->first->NodeNum << ")\n";
cerr << I->Dep << " - SU(" << I->Dep->NodeNum << ")\n";
}
}
cerr << "\n";

14
lib/CodeGen/SelectionDAG/ScheduleDAGList.cpp

@ -134,9 +134,9 @@ void ScheduleDAGList::ReleaseSucc(SUnit *SuccSU, bool isChain) {
// If this is a token edge, we don't need to wait for the latency of the
// preceeding instruction (e.g. a long-latency load) unless there is also
// some other data dependence.
SUnit &Pred = *I->first;
SUnit &Pred = *I->Dep;
unsigned PredDoneCycle = Pred.Cycle;
if (!I->second)
if (!I->isCtrl)
PredDoneCycle += Pred.Latency;
else if (Pred.Latency)
PredDoneCycle += 1;
@ -161,7 +161,7 @@ void ScheduleDAGList::ScheduleNodeTopDown(SUnit *SU, unsigned CurCycle) {
// Bottom up: release successors.
for (SUnit::succ_iterator I = SU->Succs.begin(), E = SU->Succs.end();
I != E; ++I)
ReleaseSucc(I->first, I->second);
ReleaseSucc(I->Dep, I->isCtrl);
}
/// ListScheduleTopDown - The main loop of list scheduling for top-down
@ -436,7 +436,7 @@ int LatencyPriorityQueue::CalcLatency(const SUnit &SU) {
int MaxSuccLatency = 0;
for (SUnit::const_succ_iterator I = SU.Succs.begin(), E = SU.Succs.end();
I != E; ++I)
MaxSuccLatency = std::max(MaxSuccLatency, CalcLatency(*I->first));
MaxSuccLatency = std::max(MaxSuccLatency, CalcLatency(*I->Dep));
return Latency = MaxSuccLatency + SU.Latency;
}
@ -456,7 +456,7 @@ SUnit *LatencyPriorityQueue::getSingleUnscheduledPred(SUnit *SU) {
SUnit *OnlyAvailablePred = 0;
for (SUnit::const_pred_iterator I = SU->Preds.begin(), E = SU->Preds.end();
I != E; ++I) {
SUnit &Pred = *I->first;
SUnit &Pred = *I->Dep;
if (!Pred.isScheduled) {
// We found an available, but not scheduled, predecessor. If it's the
// only one we have found, keep track of it... otherwise give up.
@ -475,7 +475,7 @@ void LatencyPriorityQueue::push_impl(SUnit *SU) {
unsigned NumNodesBlocking = 0;
for (SUnit::const_succ_iterator I = SU->Succs.begin(), E = SU->Succs.end();
I != E; ++I)
if (getSingleUnscheduledPred(I->first) == SU)
if (getSingleUnscheduledPred(I->Dep) == SU)
++NumNodesBlocking;
NumNodesSolelyBlocking[SU->NodeNum] = NumNodesBlocking;
@ -490,7 +490,7 @@ void LatencyPriorityQueue::push_impl(SUnit *SU) {
void LatencyPriorityQueue::ScheduledNode(SUnit *SU) {
for (SUnit::const_succ_iterator I = SU->Succs.begin(), E = SU->Succs.end();
I != E; ++I)
AdjustPriorityOfUnscheduledPreds(I->first);
AdjustPriorityOfUnscheduledPreds(I->Dep);
}
/// AdjustPriorityOfUnscheduledPreds - One of the predecessors of SU was just

44
lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp

@ -157,8 +157,8 @@ void ScheduleDAGRRList::CommuteNodesToReducePressure() {
for (SUnit::pred_iterator I = SU->Preds.begin(), E = SU->Preds.end();
I != E; ++I) {
if (!I->second)
OperandSeen.insert(I->first);
if (!I->isCtrl)
OperandSeen.insert(I->Dep);
}
}
}
@ -214,7 +214,7 @@ void ScheduleDAGRRList::ScheduleNodeBottomUp(SUnit *SU, unsigned CurCycle) {
// Bottom up: release predecessors
for (SUnit::pred_iterator I = SU->Preds.begin(), E = SU->Preds.end();
I != E; ++I)
ReleasePred(I->first, I->second, CurCycle);
ReleasePred(I->Dep, I->isCtrl, CurCycle);
SU->isScheduled = true;
}
@ -325,7 +325,7 @@ void ScheduleDAGRRList::ScheduleNodeTopDown(SUnit *SU, unsigned CurCycle) {
// Top down: release successors
for (SUnit::succ_iterator I = SU->Succs.begin(), E = SU->Succs.end();
I != E; ++I)
ReleaseSucc(I->first, I->second, CurCycle);
ReleaseSucc(I->Dep, I->isCtrl, CurCycle);
SU->isScheduled = true;
}
@ -584,11 +584,11 @@ static unsigned closestSucc(const SUnit *SU) {
unsigned MaxCycle = 0;
for (SUnit::const_succ_iterator I = SU->Succs.begin(), E = SU->Succs.end();
I != E; ++I) {
unsigned Cycle = I->first->Cycle;
unsigned Cycle = I->Dep->Cycle;
// If there are bunch of CopyToRegs stacked up, they should be considered
// to be at the same position.
if (I->first->Node->getOpcode() == ISD::CopyToReg)
Cycle = closestSucc(I->first)+1;
if (I->Dep->Node->getOpcode() == ISD::CopyToReg)
Cycle = closestSucc(I->Dep)+1;
if (Cycle > MaxCycle)
MaxCycle = Cycle;
}
@ -602,14 +602,14 @@ static unsigned calcMaxScratches(const SUnit *SU) {
unsigned Scratches = 0;
for (SUnit::const_pred_iterator I = SU->Preds.begin(), E = SU->Preds.end();
I != E; ++I) {
if (I->second) continue; // ignore chain preds
if (I->first->Node->getOpcode() != ISD::CopyFromReg)
if (I->isCtrl) continue; // ignore chain preds
if (I->Dep->Node->getOpcode() != ISD::CopyFromReg)
Scratches++;
}
for (SUnit::const_succ_iterator I = SU->Succs.begin(), E = SU->Succs.end();
I != E; ++I) {
if (I->second) continue; // ignore chain succs
if (I->first->Node->getOpcode() != ISD::CopyToReg)
if (I->isCtrl) continue; // ignore chain succs
if (I->Dep->Node->getOpcode() != ISD::CopyToReg)
Scratches += 10;
}
return Scratches;
@ -691,7 +691,7 @@ static void isReachable(SUnit *SU, SUnit *TargetSU,
for (SUnit::pred_iterator I = SU->Preds.begin(), E = SU->Preds.end(); I != E;
++I)
isReachable(I->first, TargetSU, Visited, Reached);
isReachable(I->Dep, TargetSU, Visited, Reached);
}
static bool isReachable(SUnit *SU, SUnit *TargetSU) {
@ -744,8 +744,8 @@ void BURegReductionPriorityQueue<SF>::AddPseudoTwoAddrDeps() {
if (!DUSU) continue;
for (SUnit::succ_iterator I = DUSU->Succs.begin(),E = DUSU->Succs.end();
I != E; ++I) {
if (I->second) continue;
SUnit *SuccSU = I->first;
if (I->isCtrl) continue;
SUnit *SuccSU = I->Dep;
if (SuccSU != SU &&
(!canClobber(SuccSU, DUSU) ||
(!SU->isCommutable && SuccSU->isCommutable))){
@ -776,13 +776,13 @@ CalcNodeSethiUllmanNumber(const SUnit *SU) {
unsigned Extra = 0;
for (SUnit::const_pred_iterator I = SU->Preds.begin(), E = SU->Preds.end();
I != E; ++I) {
if (I->second) continue; // ignore chain preds
SUnit *PredSU = I->first;
if (I->isCtrl) continue; // ignore chain preds
SUnit *PredSU = I->Dep;
unsigned PredSethiUllman = CalcNodeSethiUllmanNumber(PredSU);
if (PredSethiUllman > SethiUllmanNumber) {
SethiUllmanNumber = PredSethiUllman;
Extra = 0;
} else if (PredSethiUllman == SethiUllmanNumber && !I->second)
} else if (PredSethiUllman == SethiUllmanNumber && !I->isCtrl)
Extra++;
}
@ -808,10 +808,10 @@ static unsigned SumOfUnscheduledPredsOfSuccs(const SUnit *SU) {
unsigned Sum = 0;
for (SUnit::const_succ_iterator I = SU->Succs.begin(), E = SU->Succs.end();
I != E; ++I) {
SUnit *SuccSU = I->first;
SUnit *SuccSU = I->Dep;
for (SUnit::const_pred_iterator II = SuccSU->Preds.begin(),
EE = SuccSU->Preds.end(); II != EE; ++II) {
SUnit *PredSU = II->first;
SUnit *PredSU = II->Dep;
if (!PredSU->isScheduled)
Sum++;
}
@ -899,13 +899,13 @@ CalcNodeSethiUllmanNumber(const SUnit *SU) {
int Extra = 0;
for (SUnit::const_pred_iterator I = SU->Preds.begin(), E = SU->Preds.end();
I != E; ++I) {
if (I->second) continue; // ignore chain preds
SUnit *PredSU = I->first;
if (I->isCtrl) continue; // ignore chain preds
SUnit *PredSU = I->Dep;
unsigned PredSethiUllman = CalcNodeSethiUllmanNumber(PredSU);
if (PredSethiUllman > SethiUllmanNumber) {
SethiUllmanNumber = PredSethiUllman;
Extra = 0;
} else if (PredSethiUllman == SethiUllmanNumber && !I->second)
} else if (PredSethiUllman == SethiUllmanNumber && !I->isCtrl)
Extra++;
}

2
lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp

@ -264,7 +264,7 @@ namespace llvm {
/// edge, override this method.
template<typename EdgeIter>
static std::string getEdgeAttributes(const void *Node, EdgeIter EI) {
if (EI.isChain())
if (EI.isCtrlDep())
return "color=blue,style=dashed";
return "";
}