1//==- ScheduleDAGMutation.h - MachineInstr Scheduling ------------*- C++ -*-==//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the ScheduleDAGMutation class, which represents
11// a target-specific mutation of the dependency graph for scheduling.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef LLVM_CODEGEN_SCHEDULEDAGMUTATION_H
16#define LLVM_CODEGEN_SCHEDULEDAGMUTATION_H
17
18namespace llvm {
19  class ScheduleDAGInstrs;
20
21  /// Mutate the DAG as a postpass after normal DAG building.
22  class ScheduleDAGMutation {
23    virtual void anchor();
24  public:
25    virtual ~ScheduleDAGMutation() {}
26
27    virtual void apply(ScheduleDAGInstrs *DAG) = 0;
28  };
29}
30
31#endif
32