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is currently off by default, and can be enabled with -disable-post-RA-scheduler=false. This doesn't have a significant impact on most code yet because it doesn't yet do anything to address anti-dependencies and it doesn't attempt to disambiguate memory references. Also, several popular targets don't have pipeline descriptions yet. The majority of the changes here are splitting the SelectionDAG-specific code out of ScheduleDAG, so that ScheduleDAG can be moved to libLLVMCodeGen.a. The interface between ScheduleDAG-using code and the rest of the scheduling code is somewhat rough and will evolve. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59676 91177308-0d34-0410-b5e6-96231b3b80d8
125 lines
3.7 KiB
C++
125 lines
3.7 KiB
C++
//===---- LatencyPriorityQueue.h - A latency-oriented priority queue ------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the LatencyPriorityQueue class, which is a
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// SchedulingPriorityQueue that schedules using latency information to
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// reduce the length of the critical path through the basic block.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LATENCY_PRIORITY_QUEUE_H
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#define LATENCY_PRIORITY_QUEUE_H
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#include "llvm/CodeGen/ScheduleDAG.h"
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#include "llvm/ADT/PriorityQueue.h"
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namespace llvm {
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class LatencyPriorityQueue;
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/// Sorting functions for the Available queue.
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struct latency_sort : public std::binary_function<SUnit*, SUnit*, bool> {
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LatencyPriorityQueue *PQ;
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explicit latency_sort(LatencyPriorityQueue *pq) : PQ(pq) {}
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bool operator()(const SUnit* left, const SUnit* right) const;
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};
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class LatencyPriorityQueue : public SchedulingPriorityQueue {
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// SUnits - The SUnits for the current graph.
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std::vector<SUnit> *SUnits;
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// Latencies - The latency (max of latency from this node to the bb exit)
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// for each node.
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std::vector<int> Latencies;
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/// NumNodesSolelyBlocking - This vector contains, for every node in the
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/// Queue, the number of nodes that the node is the sole unscheduled
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/// predecessor for. This is used as a tie-breaker heuristic for better
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/// mobility.
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std::vector<unsigned> NumNodesSolelyBlocking;
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PriorityQueue<SUnit*, std::vector<SUnit*>, latency_sort> Queue;
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public:
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LatencyPriorityQueue() : Queue(latency_sort(this)) {
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}
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void initNodes(std::vector<SUnit> &sunits) {
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SUnits = &sunits;
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// Calculate node priorities.
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CalculatePriorities();
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}
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void addNode(const SUnit *SU) {
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Latencies.resize(SUnits->size(), -1);
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NumNodesSolelyBlocking.resize(SUnits->size(), 0);
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CalcLatency(*SU);
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}
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void updateNode(const SUnit *SU) {
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Latencies[SU->NodeNum] = -1;
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CalcLatency(*SU);
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}
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void releaseState() {
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SUnits = 0;
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Latencies.clear();
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}
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unsigned getLatency(unsigned NodeNum) const {
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assert(NodeNum < Latencies.size());
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return Latencies[NodeNum];
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}
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unsigned getNumSolelyBlockNodes(unsigned NodeNum) const {
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assert(NodeNum < NumNodesSolelyBlocking.size());
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return NumNodesSolelyBlocking[NodeNum];
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}
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unsigned size() const { return Queue.size(); }
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bool empty() const { return Queue.empty(); }
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virtual void push(SUnit *U) {
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push_impl(U);
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}
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void push_impl(SUnit *U);
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void push_all(const std::vector<SUnit *> &Nodes) {
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for (unsigned i = 0, e = Nodes.size(); i != e; ++i)
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push_impl(Nodes[i]);
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}
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SUnit *pop() {
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if (empty()) return NULL;
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SUnit *V = Queue.top();
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Queue.pop();
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return V;
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}
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void remove(SUnit *SU) {
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assert(!Queue.empty() && "Not in queue!");
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Queue.erase_one(SU);
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}
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// ScheduledNode - As nodes are scheduled, we look to see if there are any
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// successor nodes that have a single unscheduled predecessor. If so, that
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// single predecessor has a higher priority, since scheduling it will make
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// the node available.
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void ScheduledNode(SUnit *Node);
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private:
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void CalculatePriorities();
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int CalcLatency(const SUnit &SU);
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void AdjustPriorityOfUnscheduledPreds(SUnit *SU);
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SUnit *getSingleUnscheduledPred(SUnit *SU);
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};
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}
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#endif
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