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//==- llvm/CodeGen/ScheduleDAGInstrs.h - MachineInstr Scheduling -*- C++ -*-==//
//
// 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 ScheduleDAGInstrs class, which implements
// scheduling for a MachineInstr-based dependency graph.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_SCHEDULEDAGINSTRS_H
#define LLVM_CODEGEN_SCHEDULEDAGINSTRS_H
#include "llvm/CodeGen/ScheduleDAG.h"
#include "llvm/Target/TargetRegisterInfo.h"
namespace llvm {
class MachineLoopInfo;
class MachineDominatorTree;
class ScheduleDAGInstrs : public ScheduleDAG {
const MachineLoopInfo &MLI;
const MachineDominatorTree &MDT;
/// Defs, Uses - Remember where defs and uses of each physical register
/// are as we iterate upward through the instructions. This is allocated
/// here instead of inside BuildSchedGraph to avoid the need for it to be
/// initialized and destructed for each block.
std::vector<SUnit *> Defs[TargetRegisterInfo::FirstVirtualRegister];
std::vector<SUnit *> Uses[TargetRegisterInfo::FirstVirtualRegister];
/// PendingLoads - Remember where unknown loads are after the most recent
/// unknown store, as we iterate. As with Defs and Uses, this is here
/// to minimize construction/destruction.
std::vector<SUnit *> PendingLoads;
public:
explicit ScheduleDAGInstrs(MachineFunction &mf,
const MachineLoopInfo &mli,
const MachineDominatorTree &mdt);
virtual ~ScheduleDAGInstrs() {}
/// NewSUnit - Creates a new SUnit and return a ptr to it.
///
SUnit *NewSUnit(MachineInstr *MI) {
#ifndef NDEBUG
const SUnit *Addr = &SUnits[0];
#endif
SUnits.push_back(SUnit(MI, (unsigned)SUnits.size()));
assert(Addr == &SUnits[0] && "SUnits std::vector reallocated on the fly!");
SUnits.back().OrigNode = &SUnits.back();
return &SUnits.back();
}
/// BuildSchedGraph - Build SUnits from the MachineBasicBlock that we are
/// input.
virtual void BuildSchedGraph();
/// ComputeLatency - Compute node latency.
///
virtual void ComputeLatency(SUnit *SU);
virtual MachineBasicBlock *EmitSchedule();
/// Schedule - Order nodes according to selected style, filling
/// in the Sequence member.
///
virtual void Schedule() = 0;
virtual void dumpNode(const SUnit *SU) const;
virtual std::string getGraphNodeLabel(const SUnit *SU) const;
};
}
#endif
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