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Fix some formatting, when looking for hazards, prefer target nodes over 

things like copyfromreg.

llvm-svn: 26586
This commit is contained in:
Chris Lattner 2006-03-07 05:40:43 +00:00
parent 883cefc656
commit 0c801bd1cf
1 changed files with 15 additions and 7 deletions
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22
llvm/lib/CodeGen/SelectionDAG/ScheduleDAGList.cpp
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@ -435,19 +435,27 @@ void ScheduleDAGList::ListScheduleTopDown() {
bool HasNoopHazards = false;
do {
SUnit *CurrNode = Available.top();
SUnit *CurNode = Available.top();
Available.pop();
HazardRecognizer::HazardType HT =
HazardRec.getHazardType(CurrNode->Node);
// Get the node represented by this SUnit.
SDNode *N = CurNode->Node;
// If this is a pseudo op, like copyfromreg, look to see if there is a
// real target node flagged to it. If so, use the target node.
for (unsigned i = 0, e = CurNode->FlaggedNodes.size();
N->getOpcode() < ISD::BUILTIN_OP_END && i != e; ++i)
N = CurNode->FlaggedNodes[i];
HazardRecognizer::HazardType HT = HazardRec.getHazardType(N);
if (HT == HazardRecognizer::NoHazard) {
FoundNode = CurrNode;
FoundNode = CurNode;
break;
}
// Remember if this is a noop hazard.
HasNoopHazards |= HT == HazardRecognizer::NoopHazard;
NotReady.push_back(CurrNode);
NotReady.push_back(CurNode);
} while (!Available.empty());
// Add the nodes that aren't ready back onto the available list.
@ -463,14 +471,14 @@ void ScheduleDAGList::ListScheduleTopDown() {
} else if (!HasNoopHazards) {
// Otherwise, we have a pipeline stall, but no other problem, just advance
// the current cycle and try again.
DEBUG(std::cerr << "*** Advancing cycle, no work to do");
DEBUG(std::cerr << "*** Advancing cycle, no work to do\n");
HazardRec.AdvanceCycle();
++NumStalls;
} else {
// Otherwise, we have no instructions to issue and we have instructions
// that will fault if we don't do this right. This is the case for
// processors without pipeline interlocks and other cases.
DEBUG(std::cerr << "*** Emitting noop");
DEBUG(std::cerr << "*** Emitting noop\n");
HazardRec.EmitNoop();
Sequence.push_back(0); // NULL SUnit* -> noop
++NumNoops;