1 files changed, 31 insertions, 0 deletions
diff --git a/include/llvm/CodeGen/ScheduleDAGMutation.h b/include/llvm/CodeGen/ScheduleDAGMutation.h
new file mode 100644
index 0000000000000..02fe2294815c4
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+++ b/include/llvm/CodeGen/ScheduleDAGMutation.h
@@ -0,0 +1,31 @@
+//==- ScheduleDAGMutation.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 ScheduleDAGMutation class, which represents
+// a target-specific mutation of the dependency graph for scheduling.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_SCHEDULEDAGMUTATION_H
+#define LLVM_CODEGEN_SCHEDULEDAGMUTATION_H
+
+namespace llvm {
+  class ScheduleDAGInstrs;
+
+  /// Mutate the DAG as a postpass after normal DAG building.
+  class ScheduleDAGMutation {
+    virtual void anchor();
+  public:
+    virtual ~ScheduleDAGMutation() {}
+
+    virtual void apply(ScheduleDAGInstrs *DAG) = 0;
+  };
+}
+
+#endif