MC: Remove the copy of MCSchedModel in MCSubtargetInfo

[oota-llvm.git] / include / llvm / CodeGen / ScheduleHazardRecognizer.h

diff --git a/include/llvm/CodeGen/ScheduleHazardRecognizer.h b/include/llvm/CodeGen/ScheduleHazardRecognizer.h
index fd62841918cbbab69baff0c0d010e98f41947007..8a40e7212ff6d37e3bf7ae7014dea552b9ea20eb 100644 (file)
--- a/include/llvm/CodeGen/ScheduleHazardRecognizer.h
+++ b/include/llvm/CodeGen/ScheduleHazardRecognizer.h
@@ -46,6 +46,8 @@ public:
 
   /// atIssueLimit - Return true if no more instructions may be issued in this
   /// cycle.
+  ///
+  /// FIXME: remove this once MachineScheduler is the only client.
   virtual bool atIssueLimit() const { return false; }
 
   /// getHazardType - Return the hazard type of emitting this node.  There are
@@ -68,6 +70,22 @@ public:
   /// emitted, to advance the hazard state.
   virtual void EmitInstruction(SUnit *) {}
 
+  /// PreEmitNoops - This callback is invoked prior to emitting an instruction.
+  /// It should return the number of noops to emit prior to the provided
+  /// instruction.
+  /// Note: This is only used during PostRA scheduling. EmitNoop is not called
+  /// for these noops.
+  virtual unsigned PreEmitNoops(SUnit *) {
+    return 0;
+  }
+
+  /// ShouldPreferAnother - This callback may be invoked if getHazardType
+  /// returns NoHazard. If, even though there is no hazard, it would be better to
+  /// schedule another available instruction, this callback should return true.
+  virtual bool ShouldPreferAnother(SUnit *) {
+    return false;
+  }
+
   /// AdvanceCycle - This callback is invoked whenever the next top-down
   /// instruction to be scheduled cannot issue in the current cycle, either
   /// because of latency or resource conflicts.  This should increment the