[Packetizer] Make endPacket virtual

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

diff --git a/include/llvm/CodeGen/DFAPacketizer.h b/include/llvm/CodeGen/DFAPacketizer.h
index 791b66e142923fe2d7a831f14339afe09b60f966..9daec9859ed87e33d89ca2543058b265bdbb34b3 100644 (file)
--- a/include/llvm/CodeGen/DFAPacketizer.h
+++ b/include/llvm/CodeGen/DFAPacketizer.h
@@ -40,22 +40,51 @@ class InstrItineraryData;
 class DefaultVLIWScheduler;
 class SUnit;
 
+// --------------------------------------------------------------------
+// Definitions shared between DFAPacketizer.cpp and DFAPacketizerEmitter.cpp
+
+// DFA_MAX_RESTERMS * DFA_MAX_RESOURCES must fit within sizeof DFAInput.
+// This is verified in DFAPacketizer.cpp:DFAPacketizer::DFAPacketizer.
+//
+// e.g. terms x resource bit combinations that fit in uint32_t:
+//      4 terms x 8  bits = 32 bits
+//      3 terms x 10 bits = 30 bits
+//      2 terms x 16 bits = 32 bits
+//
+// e.g. terms x resource bit combinations that fit in uint64_t:
+//      8 terms x 8  bits = 64 bits
+//      7 terms x 9  bits = 63 bits
+//      6 terms x 10 bits = 60 bits
+//      5 terms x 12 bits = 60 bits
+//      4 terms x 16 bits = 64 bits <--- current
+//      3 terms x 21 bits = 63 bits
+//      2 terms x 32 bits = 64 bits
+//
+#define DFA_MAX_RESTERMS        4   // The max # of AND'ed resource terms.
+#define DFA_MAX_RESOURCES       16  // The max # of resource bits in one term.
+
+typedef uint64_t                DFAInput;
+typedef int64_t                 DFAStateInput;
+#define DFA_TBLTYPE             "int64_t" // For generating DFAStateInputTable.
+// --------------------------------------------------------------------
+
 class DFAPacketizer {
 private:
-  typedef std::pair<unsigned, unsigned> UnsignPair;
+  typedef std::pair<unsigned, DFAInput> UnsignPair;
+
   const InstrItineraryData *InstrItins;
   int CurrentState;
-  const int (*DFAStateInputTable)[2];
+  const DFAStateInput (*DFAStateInputTable)[2];
   const unsigned *DFAStateEntryTable;
 
   // CachedTable is a map from <FromState, Input> to ToState.
   DenseMap<UnsignPair, unsigned> CachedTable;
 
   // ReadTable - Read the DFA transition table and update CachedTable.
-  void ReadTable(unsigned int state);
+  void ReadTable(unsigned state);
 
 public:
-  DFAPacketizer(const InstrItineraryData *I, const int (*SIT)[2],
+  DFAPacketizer(const InstrItineraryData *I, const DFAStateInput (*SIT)[2],
                 const unsigned *SET);
 
   // Reset the current state to make all resources available.
@@ -63,6 +92,12 @@ public:
     CurrentState = 0;
   }
 
+  // getInsnInput - Return the DFAInput for an instruction class.
+  DFAInput getInsnInput(unsigned InsnClass);
+
+  // getInsnInput - Return the DFAInput for an instruction class input vector.
+  static DFAInput getInsnInput(const std::vector<unsigned> &InsnClass);
+
   // canReserveResources - Check if the resources occupied by a MCInstrDesc
   // are available in the current state.
   bool canReserveResources(const llvm::MCInstrDesc *MID);
@@ -126,8 +161,10 @@ public:
     return MII;
   }
 
-  // endPacket - End the current packet.
-  void endPacket(MachineBasicBlock *MBB, MachineInstr *MI);
+  // End the current packet and reset the state of the packetizer.
+  // Overriding this function allows the target-specific packetizer
+  // to perform custom finalization.
+  virtual void endPacket(MachineBasicBlock *MBB, MachineInstr *MI);
 
   // initPacketizerState - perform initialization before packetizing
   // an instruction. This function is supposed to be overrided by
@@ -135,14 +172,14 @@ public:
   virtual void initPacketizerState() { return; }
 
   // ignorePseudoInstruction - Ignore bundling of pseudo instructions.
-  virtual bool ignorePseudoInstruction(MachineInstr *I,
-                                       MachineBasicBlock *MBB) {
+  virtual bool ignorePseudoInstruction(const MachineInstr *I,
+                                       const MachineBasicBlock *MBB) {
     return false;
   }
 
   // isSoloInstruction - return true if instruction MI can not be packetized
   // with any other instruction, which means that MI itself is a packet.
-  virtual bool isSoloInstruction(MachineInstr *MI) {
+  virtual bool isSoloInstruction(const MachineInstr *MI) {
     return true;
   }