Inline check that's used only once.

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

diff --git a/lib/CodeGen/LiveRangeEdit.h b/lib/CodeGen/LiveRangeEdit.h
index aa86740773f3403ee7266a9f90dd1d3833a5007d..04eced6d79b7d59bc659285422a08327e75dd42b 100644 (file)
--- a/lib/CodeGen/LiveRangeEdit.h
+++ b/lib/CodeGen/LiveRangeEdit.h
@@ -34,6 +34,14 @@ public:
   struct Delegate {
     /// Called immediately before erasing a dead machine instruction.
     virtual void LRE_WillEraseInstruction(MachineInstr *MI) {}
+
+    /// Called when a virtual register is no longer used. Return false to defer
+    /// its deletion from LiveIntervals.
+    virtual bool LRE_CanEraseVirtReg(unsigned) { return true; }
+
+    /// Called before shrinking the live range of a virtual register.
+    virtual void LRE_WillShrinkVirtReg(unsigned) {}
+
     virtual ~Delegate() {}
   };
 
@@ -76,7 +84,7 @@ public:
   ///        rematerializing values because they are about to be removed.
   LiveRangeEdit(LiveInterval &parent,
                 SmallVectorImpl<LiveInterval*> &newRegs,
-                Delegate *delegate,
+                Delegate *delegate = 0,
                 const SmallVectorImpl<LiveInterval*> *uselessRegs = 0)
     : parent_(parent), newRegs_(newRegs),
       delegate_(delegate),
@@ -95,9 +103,21 @@ public:
   bool empty() const { return size() == 0; }
   LiveInterval *get(unsigned idx) const { return newRegs_[idx+firstNew_]; }
 
-  /// create - Create a new register with the same class and stack slot as
+  /// FIXME: Temporary accessors until we can get rid of
+  /// LiveIntervals::AddIntervalsForSpills
+  SmallVectorImpl<LiveInterval*> *getNewVRegs() { return &newRegs_; }
+  const SmallVectorImpl<LiveInterval*> *getUselessVRegs() {
+    return uselessRegs_;
+  }
+
+  /// createFrom - Create a new virtual register based on OldReg.
+  LiveInterval &createFrom(unsigned OldReg, LiveIntervals&, VirtRegMap&);
+
+  /// create - Create a new register with the same class and original slot as
   /// parent.
-  LiveInterval &create(MachineRegisterInfo&, LiveIntervals&, VirtRegMap&);
+  LiveInterval &create(LiveIntervals &LIS, VirtRegMap &VRM) {
+    return createFrom(getReg(), LIS, VRM);
+  }
 
   /// anyRematerializable - Return true if any parent values may be
   /// rematerializable.
@@ -105,6 +125,11 @@ public:
   bool anyRematerializable(LiveIntervals&, const TargetInstrInfo&,
                            AliasAnalysis*);
 
+  /// checkRematerializable - Manually add VNI to the list of rematerializable
+  /// values if DefMI may be rematerializable.
+  void checkRematerializable(VNInfo *VNI, const MachineInstr *DefMI,
+                             const TargetInstrInfo&, AliasAnalysis*);
+
   /// Remat - Information needed to rematerialize at a specific location.
   struct Remat {
     VNInfo *ParentVNI;      // parent_'s value at the remat location.
@@ -143,11 +168,15 @@ public:
     return rematted_.count(ParentVNI);
   }
 
+  /// eraseVirtReg - Notify the delegate that Reg is no longer in use, and try
+  /// to erase it from LIS.
+  void eraseVirtReg(unsigned Reg, LiveIntervals &LIS);
+
   /// eliminateDeadDefs - Try to delete machine instructions that are now dead
   /// (allDefsAreDead returns true). This may cause live intervals to be trimmed
   /// and further dead efs to be eliminated.
   void eliminateDeadDefs(SmallVectorImpl<MachineInstr*> &Dead,
-                         LiveIntervals&,
+                         LiveIntervals&, VirtRegMap&,
                          const TargetInstrInfo&);
 
 };