Use array_lengthof to compute the number of iterations of a loop.

[oota-llvm.git] / lib / CodeGen / CriticalAntiDepBreaker.h

diff --git a/lib/CodeGen/CriticalAntiDepBreaker.h b/lib/CodeGen/CriticalAntiDepBreaker.h
index ea7c73ce36ef493f1a1592c0d65eba41adc254f2..07107802972d5f037b4d1fb217f8ce857feba414 100644 (file)
--- a/lib/CodeGen/CriticalAntiDepBreaker.h
+++ b/lib/CodeGen/CriticalAntiDepBreaker.h
@@ -17,20 +17,27 @@
 #define LLVM_CODEGEN_CRITICALANTIDEPBREAKER_H
 
 #include "AntiDepBreaker.h"
+#include "RegisterClassInfo.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/ScheduleDAG.h"
-#include "llvm/Target/TargetRegisterInfo.h"
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/SmallSet.h"
+#include <map>
 
 namespace llvm {
+class RegisterClassInfo;
+class TargetInstrInfo;
+class TargetRegisterInfo;
+
   class CriticalAntiDepBreaker : public AntiDepBreaker {
     MachineFunction& MF;
     MachineRegisterInfo &MRI;
+    const TargetInstrInfo *TII;
     const TargetRegisterInfo *TRI;
+    const RegisterClassInfo &RegClassInfo;
 
     /// AllocatableSet - The set of allocatable registers.
     /// We'll be ignoring anti-dependencies on non-allocatable registers,
@@ -42,42 +49,41 @@ namespace llvm {
     /// corresponding value is null. If the register is live but used in
     /// multiple register classes, the corresponding value is -1 casted to a
     /// pointer.
-    const TargetRegisterClass *
-      Classes[TargetRegisterInfo::FirstVirtualRegister];
+    std::vector<const TargetRegisterClass*> Classes;
 
-    /// RegRegs - Map registers to all their references within a live range.
+    /// RegRefs - Map registers to all their references within a live range.
     std::multimap<unsigned, MachineOperand *> RegRefs;
+    typedef std::multimap<unsigned, MachineOperand *>::const_iterator
+      RegRefIter;
 
     /// KillIndices - The index of the most recent kill (proceding bottom-up),
     /// or ~0u if the register is not live.
-    unsigned KillIndices[TargetRegisterInfo::FirstVirtualRegister];
+    std::vector<unsigned> KillIndices;
 
     /// DefIndices - The index of the most recent complete def (proceding bottom
     /// up), or ~0u if the register is live.
-    unsigned DefIndices[TargetRegisterInfo::FirstVirtualRegister];
+    std::vector<unsigned> DefIndices;
 
     /// KeepRegs - A set of registers which are live and cannot be changed to
     /// break anti-dependencies.
     SmallSet<unsigned, 4> KeepRegs;
 
   public:
-    CriticalAntiDepBreaker(MachineFunction& MFi);
+    CriticalAntiDepBreaker(MachineFunction& MFi, const RegisterClassInfo&);
     ~CriticalAntiDepBreaker();
-    
-    /// GetMaxTrials - Critical path anti-dependence breaking requires
-    /// only a single pass
-    unsigned GetMaxTrials() { return 1; }
 
     /// Start - Initialize anti-dep breaking for a new basic block.
     void StartBlock(MachineBasicBlock *BB);
 
-    /// BreakAntiDependencies - Identifiy anti-dependencies along the critical path
+    /// BreakAntiDependencies - Identifiy anti-dependencies along the critical
+    /// path
     /// of the ScheduleDAG and break them by renaming registers.
     ///
-    unsigned BreakAntiDependencies(std::vector<SUnit>& SUnits,
-                                   MachineBasicBlock::iterator& Begin,
-                                   MachineBasicBlock::iterator& End,
-                                   unsigned InsertPosIndex);
+    unsigned BreakAntiDependencies(const std::vector<SUnit>& SUnits,
+                                   MachineBasicBlock::iterator Begin,
+                                   MachineBasicBlock::iterator End,
+                                   unsigned InsertPosIndex,
+                                   DbgValueVector &DbgValues);
 
     /// Observe - Update liveness information to account for the current
     /// instruction, which will not be scheduled.
@@ -90,9 +96,14 @@ namespace llvm {
   private:
     void PrescanInstruction(MachineInstr *MI);
     void ScanInstruction(MachineInstr *MI, unsigned Count);
-    unsigned findSuitableFreeRegister(unsigned AntiDepReg,
+    bool isNewRegClobberedByRefs(RegRefIter RegRefBegin,
+                                 RegRefIter RegRefEnd,
+                                 unsigned NewReg);
+    unsigned findSuitableFreeRegister(RegRefIter RegRefBegin,
+                                      RegRefIter RegRefEnd,
+                                      unsigned AntiDepReg,
                                       unsigned LastNewReg,
-                                      const TargetRegisterClass *);
+                                      const TargetRegisterClass *RC);
   };
 }