using namespace llvm;
bool latency_sort::operator()(const SUnit *LHS, const SUnit *RHS) const {
+ // The isScheduleHigh flag allows nodes with wraparound dependencies that
+ // cannot easily be modeled as edges with latencies to be scheduled as
+ // soon as possible in a top-down schedule.
+ if (LHS->isScheduleHigh && !RHS->isScheduleHigh)
+ return false;
+ if (!LHS->isScheduleHigh && RHS->isScheduleHigh)
+ return true;
+
unsigned LHSNum = LHS->NodeNum;
unsigned RHSNum = RHS->NodeNum;
return OnlyAvailablePred;
}
-void LatencyPriorityQueue::push_impl(SUnit *SU) {
+void LatencyPriorityQueue::push(SUnit *SU) {
// Look at all of the successors of this node. Count the number of nodes that
// this node is the sole unscheduled node for.
unsigned NumNodesBlocking = 0;
for (SUnit::const_succ_iterator I = SU->Succs.begin(), E = SU->Succs.end();
- I != E; ++I)
+ I != E; ++I) {
if (getSingleUnscheduledPred(I->getSUnit()) == SU)
++NumNodesBlocking;
+ }
NumNodesSolelyBlocking[SU->NodeNum] = NumNodesBlocking;
- Queue.push(SU);
+ Queue.push_back(SU);
}
// the node available.
void LatencyPriorityQueue::ScheduledNode(SUnit *SU) {
for (SUnit::const_succ_iterator I = SU->Succs.begin(), E = SU->Succs.end();
- I != E; ++I)
+ I != E; ++I) {
AdjustPriorityOfUnscheduledPreds(I->getSUnit());
+ }
}
/// AdjustPriorityOfUnscheduledPreds - One of the predecessors of SU was just
// NumNodesSolelyBlocking value.
push(OnlyAvailablePred);
}
+
+SUnit *LatencyPriorityQueue::pop() {
+ if (empty()) return NULL;
+ std::vector<SUnit *>::iterator Best = Queue.begin();
+ for (std::vector<SUnit *>::iterator I = llvm::next(Queue.begin()),
+ E = Queue.end(); I != E; ++I)
+ if (Picker(*Best, *I))
+ Best = I;
+ SUnit *V = *Best;
+ if (Best != prior(Queue.end()))
+ std::swap(*Best, Queue.back());
+ Queue.pop_back();
+ return V;
+}
+
+void LatencyPriorityQueue::remove(SUnit *SU) {
+ assert(!Queue.empty() && "Queue is empty!");
+ std::vector<SUnit *>::iterator I = std::find(Queue.begin(), Queue.end(), SU);
+ if (I != prior(Queue.end()))
+ std::swap(*I, Queue.back());
+ Queue.pop_back();
+}