Teach PHI elimination to remove REG_SEQUENCE instructions and update references of...

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

diff --git a/lib/CodeGen/PHIElimination.h b/lib/CodeGen/PHIElimination.h
index ff4aa20918545955104abeac6a98cbef4437c447..3292aa27af64807ede18bdab7b0d0a3be1cf791a 100644 (file)
--- a/lib/CodeGen/PHIElimination.h
+++ b/lib/CodeGen/PHIElimination.h
@@ -94,6 +94,8 @@ namespace llvm {
       return I;
     }
 
+    bool EliminateRegSequences(MachineFunction &MF);
+
     typedef std::pair<unsigned, unsigned> BBVRegPair;
     typedef DenseMap<BBVRegPair, unsigned> VRegPHIUse;
 
@@ -102,15 +104,9 @@ namespace llvm {
     // Defs of PHI sources which are implicit_def.
     SmallPtrSet<MachineInstr*, 4> ImpDefs;
 
-    // Lowered PHI nodes may be reused. We provide special DenseMap traits to
-    // match PHI nodes with identical arguments.
-    struct PHINodeTraits : public DenseMapInfo<MachineInstr*> {
-      static unsigned getHashValue(const MachineInstr *PtrVal);
-      static bool isEqual(const MachineInstr *LHS, const MachineInstr *RHS);
-    };
-
     // Map reusable lowered PHI node -> incoming join register.
-    typedef DenseMap<MachineInstr*, unsigned, PHINodeTraits> LoweredPHIMap;
+    typedef DenseMap<MachineInstr*, unsigned,
+                     MachineInstrExpressionTrait> LoweredPHIMap;
     LoweredPHIMap LoweredPHIs;
   };