1 //==- llvm/CodeGen/ScheduleDAGInstrs.h - MachineInstr Scheduling -*- C++ -*-==//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the ScheduleDAGInstrs class, which implements
11 // scheduling for a MachineInstr-based dependency graph.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_CODEGEN_SCHEDULEDAGINSTRS_H
16 #define LLVM_CODEGEN_SCHEDULEDAGINSTRS_H
18 #include "llvm/CodeGen/ScheduleDAG.h"
21 class MachineLoopInfo;
22 class MachineDominatorTree;
24 class ScheduleDAGInstrs : public ScheduleDAG {
25 const MachineLoopInfo &MLI;
26 const MachineDominatorTree &MDT;
29 ScheduleDAGInstrs(MachineBasicBlock *bb,
30 const TargetMachine &tm,
31 const MachineLoopInfo &mli,
32 const MachineDominatorTree &mdt);
34 virtual ~ScheduleDAGInstrs() {}
36 /// NewSUnit - Creates a new SUnit and return a ptr to it.
38 SUnit *NewSUnit(MachineInstr *MI) {
40 const SUnit *Addr = &SUnits[0];
42 SUnits.push_back(SUnit(MI, (unsigned)SUnits.size()));
43 assert(Addr == &SUnits[0] && "SUnits std::vector reallocated on the fly!");
44 SUnits.back().OrigNode = &SUnits.back();
45 return &SUnits.back();
48 /// BuildSchedGraph - Build SUnits from the MachineBasicBlock that we are
50 virtual void BuildSchedGraph();
52 /// ComputeLatency - Compute node latency.
54 virtual void ComputeLatency(SUnit *SU);
56 virtual MachineBasicBlock *EmitSchedule();
58 /// Schedule - Order nodes according to selected style, filling
59 /// in the Sequence member.
61 virtual void Schedule() = 0;
63 virtual void dumpNode(const SUnit *SU) const;
65 virtual std::string getGraphNodeLabel(const SUnit *SU) const;