mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-21 03:29:40 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231127 91177308-0d34-0410-b5e6-96231b3b80d8
137 lines
4.3 KiB
C++
137 lines
4.3 KiB
C++
//===----- ResourcePriorityQueue.h - A DFA-oriented priority queue -------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the ResourcePriorityQueue class, which is a
|
|
// SchedulingPriorityQueue that schedules using DFA state to
|
|
// reduce the length of the critical path through the basic block
|
|
// on VLIW platforms.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CODEGEN_RESOURCEPRIORITYQUEUE_H
|
|
#define LLVM_CODEGEN_RESOURCEPRIORITYQUEUE_H
|
|
|
|
#include "llvm/CodeGen/DFAPacketizer.h"
|
|
#include "llvm/CodeGen/ScheduleDAG.h"
|
|
#include "llvm/CodeGen/SelectionDAGISel.h"
|
|
#include "llvm/MC/MCInstrItineraries.h"
|
|
#include "llvm/Target/TargetInstrInfo.h"
|
|
#include "llvm/Target/TargetRegisterInfo.h"
|
|
|
|
namespace llvm {
|
|
class ResourcePriorityQueue;
|
|
|
|
/// Sorting functions for the Available queue.
|
|
struct resource_sort : public std::binary_function<SUnit*, SUnit*, bool> {
|
|
ResourcePriorityQueue *PQ;
|
|
explicit resource_sort(ResourcePriorityQueue *pq) : PQ(pq) {}
|
|
|
|
bool operator()(const SUnit* left, const SUnit* right) const;
|
|
};
|
|
|
|
class ResourcePriorityQueue : public SchedulingPriorityQueue {
|
|
/// SUnits - The SUnits for the current graph.
|
|
std::vector<SUnit> *SUnits;
|
|
|
|
/// NumNodesSolelyBlocking - This vector contains, for every node in the
|
|
/// Queue, the number of nodes that the node is the sole unscheduled
|
|
/// predecessor for. This is used as a tie-breaker heuristic for better
|
|
/// mobility.
|
|
std::vector<unsigned> NumNodesSolelyBlocking;
|
|
|
|
/// Queue - The queue.
|
|
std::vector<SUnit*> Queue;
|
|
|
|
/// RegPressure - Tracking current reg pressure per register class.
|
|
///
|
|
std::vector<unsigned> RegPressure;
|
|
|
|
/// RegLimit - Tracking the number of allocatable registers per register
|
|
/// class.
|
|
std::vector<unsigned> RegLimit;
|
|
|
|
resource_sort Picker;
|
|
const TargetRegisterInfo *TRI;
|
|
const TargetLowering *TLI;
|
|
const TargetInstrInfo *TII;
|
|
const InstrItineraryData* InstrItins;
|
|
/// ResourcesModel - Represents VLIW state.
|
|
/// Not limited to VLIW targets per say, but assumes
|
|
/// definition of DFA by a target.
|
|
std::unique_ptr<DFAPacketizer> ResourcesModel;
|
|
|
|
/// Resource model - packet/bundle model. Purely
|
|
/// internal at the time.
|
|
std::vector<SUnit*> Packet;
|
|
|
|
/// Heuristics for estimating register pressure.
|
|
unsigned ParallelLiveRanges;
|
|
signed HorizontalVerticalBalance;
|
|
|
|
public:
|
|
ResourcePriorityQueue(SelectionDAGISel *IS);
|
|
|
|
bool isBottomUp() const override { return false; }
|
|
|
|
void initNodes(std::vector<SUnit> &sunits) override;
|
|
|
|
void addNode(const SUnit *SU) override {
|
|
NumNodesSolelyBlocking.resize(SUnits->size(), 0);
|
|
}
|
|
|
|
void updateNode(const SUnit *SU) override {}
|
|
|
|
void releaseState() override {
|
|
SUnits = nullptr;
|
|
}
|
|
|
|
unsigned getLatency(unsigned NodeNum) const {
|
|
assert(NodeNum < (*SUnits).size());
|
|
return (*SUnits)[NodeNum].getHeight();
|
|
}
|
|
|
|
unsigned getNumSolelyBlockNodes(unsigned NodeNum) const {
|
|
assert(NodeNum < NumNodesSolelyBlocking.size());
|
|
return NumNodesSolelyBlocking[NodeNum];
|
|
}
|
|
|
|
/// Single cost function reflecting benefit of scheduling SU
|
|
/// in the current cycle.
|
|
signed SUSchedulingCost (SUnit *SU);
|
|
|
|
/// InitNumRegDefsLeft - Determine the # of regs defined by this node.
|
|
///
|
|
void initNumRegDefsLeft(SUnit *SU);
|
|
void updateNumRegDefsLeft(SUnit *SU);
|
|
signed regPressureDelta(SUnit *SU, bool RawPressure = false);
|
|
signed rawRegPressureDelta (SUnit *SU, unsigned RCId);
|
|
|
|
bool empty() const override { return Queue.empty(); }
|
|
|
|
void push(SUnit *U) override;
|
|
|
|
SUnit *pop() override;
|
|
|
|
void remove(SUnit *SU) override;
|
|
|
|
/// scheduledNode - Main resource tracking point.
|
|
void scheduledNode(SUnit *Node) override;
|
|
bool isResourceAvailable(SUnit *SU);
|
|
void reserveResources(SUnit *SU);
|
|
|
|
private:
|
|
void adjustPriorityOfUnscheduledPreds(SUnit *SU);
|
|
SUnit *getSingleUnscheduledPred(SUnit *SU);
|
|
unsigned numberRCValPredInSU (SUnit *SU, unsigned RCId);
|
|
unsigned numberRCValSuccInSU (SUnit *SU, unsigned RCId);
|
|
};
|
|
}
|
|
|
|
#endif
|