Factor out scoreboard into separate class. This way we might have several different score boards.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100644 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/ExactHazardRecognizer.h

@@ -22,35 +22,59 @@
 
 namespace llvm {
   class ExactHazardRecognizer : public ScheduleHazardRecognizer {
+    // ScoreBoard to track function unit usage. ScoreBoard[0] is a
+    // mask of the FUs in use in the cycle currently being
+    // schedule. ScoreBoard[1] is a mask for the next cycle. The
+    // ScoreBoard is used as a circular buffer with the current cycle
+    // indicated by Head.
+    class ScoreBoard {
+      unsigned *Data;
+
+      // The maximum number of cycles monitored by the Scoreboard. This
+      // value is determined based on the target itineraries to ensure
+      // that all hazards can be tracked.
+      size_t Depth;
+      // Indices into the Scoreboard that represent the current cycle.
+      size_t Head;
+    public:
+      ScoreBoard():Data(NULL), Depth(0), Head(0) { }
+      ~ScoreBoard() {
+        delete[] Data;
+      }
+
+      size_t getDepth() const { return Depth; }
+      unsigned& operator[](size_t idx) const {
+        assert(Depth && "ScoreBoard was not initialized properly!");
+
+        return Data[(Head + idx) % Depth];
+      }
+
+      void reset(size_t d = 1) {
+        if (Data == NULL) {
+          Depth = d;
+          Data = new unsigned[Depth];
+        }
+
+        memset(Data, 0, Depth * sizeof(Data[0]));
+        Head = 0;
+      }
+
+      void advance() {
+        Head = (Head + 1) % Depth;
+      }
+
+      // Print the scoreboard.
+      void dump() const;
+    };
+
     // Itinerary data for the target.
     const InstrItineraryData &ItinData;
 
-    // Scoreboard to track function unit usage. Scoreboard[0] is a
-    // mask of the FUs in use in the cycle currently being
-    // schedule. Scoreboard[1] is a mask for the next cycle. The
-    // Scoreboard is used as a circular buffer with the current cycle
-    // indicated by ScoreboardHead.
-    unsigned *Scoreboard;
-
-    // The maximum number of cycles monitored by the Scoreboard. This
-    // value is determined based on the target itineraries to ensure
-    // that all hazards can be tracked.
-    unsigned ScoreboardDepth;
-
-    // Indices into the Scoreboard that represent the current cycle.
-    unsigned ScoreboardHead;
-
-    // Return the scoreboard index to use for 'offset' cycles in the
-    // future. 'offset' of 0 returns ScoreboardHead.
-    unsigned getFutureIndex(unsigned offset);
-
-    // Print the scoreboard.
-    void dumpScoreboard();
+    ScoreBoard Scoreboard;
 
   public:
     ExactHazardRecognizer(const InstrItineraryData &ItinData);
-    ~ExactHazardRecognizer();
-    
+
     virtual HazardType getHazardType(SUnit *SU);
     virtual void Reset();
     virtual void EmitInstruction(SUnit *SU);