Remove dead code. Improve llvm_unreachable text. Simplify some control flow.

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

diff --git a/lib/CodeGen/RegAllocBase.h b/lib/CodeGen/RegAllocBase.h
index 031642117efcc69f43e561061ed67b4dccc9b17d..072fe2bdb65674469bd127555915fce30e610754 100644 (file)
--- a/lib/CodeGen/RegAllocBase.h
+++ b/lib/CodeGen/RegAllocBase.h
@@ -49,11 +49,6 @@ class VirtRegMap;
 class LiveIntervals;
 class Spiller;
 
-// Forward declare a priority queue of live virtual registers. If an
-// implementation needs to prioritize by anything other than spill weight, then
-// this will become an abstract base class with virtual calls to push/get.
-class LiveVirtRegQueue;
-
 /// RegAllocBase provides the register allocation driver and interface that can
 /// be extended to add interesting heuristics.
 ///
@@ -67,7 +62,6 @@ class RegAllocBase {
   // registers may have changed.
   unsigned UserTag;
 
-protected:
   // Array of LiveIntervalUnions indexed by physical register.
   class LiveUnionArray {
     unsigned NumRegs;
@@ -88,17 +82,19 @@ protected:
     }
   };
 
-  const TargetRegisterInfo *TRI;
-  MachineRegisterInfo *MRI;
-  VirtRegMap *VRM;
-  LiveIntervals *LIS;
-  RegisterClassInfo RegClassInfo;
   LiveUnionArray PhysReg2LiveUnion;
 
   // Current queries, one per physreg. They must be reinitialized each time we
   // query on a new live virtual register.
   OwningArrayPtr<LiveIntervalUnion::Query> Queries;
 
+protected:
+  const TargetRegisterInfo *TRI;
+  MachineRegisterInfo *MRI;
+  VirtRegMap *VRM;
+  LiveIntervals *LIS;
+  RegisterClassInfo RegClassInfo;
+
   RegAllocBase(): UserTag(0), TRI(0), MRI(0), VRM(0), LIS(0) {}
 
   virtual ~RegAllocBase() {}
@@ -115,16 +111,17 @@ protected:
     return Queries[PhysReg];
   }
 
+  // Get direct access to the underlying LiveIntervalUnion for PhysReg.
+  LiveIntervalUnion &getLiveUnion(unsigned PhysReg) {
+    return PhysReg2LiveUnion[PhysReg];
+  }
+
   // Invalidate all cached information about virtual registers - live ranges may
   // have changed.
   void invalidateVirtRegs() { ++UserTag; }
 
   // The top-level driver. The output is a VirtRegMap that us updated with
   // physical register assignments.
-  //
-  // If an implementation wants to override the LiveInterval comparator, we
-  // should modify this interface to allow passing in an instance derived from
-  // LiveVirtRegQueue.
   void allocatePhysRegs();
 
   // Get a temporary reference to a Spiller instance.
@@ -160,12 +157,6 @@ protected:
   /// allocation is making progress.
   void unassign(LiveInterval &VirtReg, unsigned PhysReg);
 
-  // Helper for spilling all live virtual registers currently unified under preg
-  // that interfere with the most recently queried lvr.  Return true if spilling
-  // was successful, and append any new spilled/split intervals to splitLVRs.
-  bool spillInterferences(LiveInterval &VirtReg, unsigned PhysReg,
-                          SmallVectorImpl<LiveInterval*> &SplitVRegs);
-
   /// addMBBLiveIns - Add physreg liveins to basic blocks.
   void addMBBLiveIns(MachineFunction *);
 
@@ -183,9 +174,6 @@ public:
 
 private:
   void seedLiveRegs();
-
-  void spillReg(LiveInterval &VirtReg, unsigned PhysReg,
-                SmallVectorImpl<LiveInterval*> &SplitVRegs);
 };
 
 } // end namespace llvm