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Change CalculateHeights and CalculateDepths to be non-recursive. 

llvm-svn: 37934
This commit is contained in:
Evan Cheng 2007-07-06 01:37:28 +00:00
parent a7d41aad4f
commit 642be16bbf
1 changed files with 28 additions and 22 deletions
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50
llvm/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
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@ -179,35 +179,41 @@ void ScheduleDAG::BuildSchedUnits() {
return;
}
static void CalculateDepths(SUnit &SU, unsigned Depth) {
if (SU.Depth == 0 || Depth > SU.Depth) {
SU.Depth = Depth;
for (SUnit::succ_iterator I = SU.Succs.begin(), E = SU.Succs.end();
I != E; ++I)
CalculateDepths(*I->first, Depth+1);
}
}
void ScheduleDAG::CalculateDepths() {
SUnit *Entry = SUnitMap[DAG.getEntryNode().Val];
::CalculateDepths(*Entry, 0U);
std::vector<std::pair<SUnit*, unsigned> > WorkList;
for (unsigned i = 0, e = SUnits.size(); i != e; ++i)
if (SUnits[i].Preds.size() == 0 && &SUnits[i] != Entry) {
::CalculateDepths(SUnits[i], 0U);
}
}
if (SUnits[i].Preds.size() == 0/* && &SUnits[i] != Entry*/)
WorkList.push_back(std::make_pair(&SUnits[i], 0U));
static void CalculateHeights(SUnit &SU, unsigned Height) {
if (SU.Height == 0 || Height > SU.Height) {
SU.Height = Height;
for (SUnit::pred_iterator I = SU.Preds.begin(), E = SU.Preds.end();
I != E; ++I)
CalculateHeights(*I->first, Height+1);
while (!WorkList.empty()) {
SUnit *SU = WorkList.back().first;
unsigned Depth = WorkList.back().second;
WorkList.pop_back();
if (SU->Depth == 0 || Depth > SU->Depth) {
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));
}
}
}
void ScheduleDAG::CalculateHeights() {
std::vector<std::pair<SUnit*, unsigned> > WorkList;
SUnit *Root = SUnitMap[DAG.getRoot().Val];
::CalculateHeights(*Root, 0U);
WorkList.push_back(std::make_pair(Root, 0U));
while (!WorkList.empty()) {
SUnit *SU = WorkList.back().first;
unsigned Height = WorkList.back().second;
WorkList.pop_back();
if (SU->Height == 0 || Height > SU->Height) {
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));
}
}
}
/// CountResults - The results of target nodes have register or immediate