Short Circuit Evaluation

src/IceCfgNode.h

 //===- subzero/src/IceCfgNode.h - Control flow graph node -------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 98 matching lines @@
   void contractIfEmpty();
   void doBranchOpt(const CfgNode *NextNode);
   void emit(Cfg *Func) const;
   void emitIAS(Cfg *Func) const;
   void dump(Cfg *Func) const;
 
   void profileExecutionCount(VariableDeclaration *Var);
 
   void addOutEdge(CfgNode *Out) { OutEdges.push_back(Out); }
   void addInEdge(CfgNode *In) { InEdges.push_back(In); }
+  void replaceInEdge(CfgNode *Old, CfgNode *New);
+  void removeAllOutEdges() { OutEdges.clear(); }
+  void removeInEdge(CfgNode *In);
 
   bool hasSingleOutEdge() const {
     return (getOutEdges().size() == 1 || getOutEdges()[0] == getOutEdges()[1]);
   }
+  CfgNode *shortCircuit();
 
 private:
   CfgNode(Cfg *Func, SizeT Number)
       : Func(Func), Number(Number), NumberOrig(Number),
         Name(NodeString::createWithoutString(Func)) {}
   bool livenessValidateIntervals(Liveness *Liveness) const;
   Cfg *const Func;
   SizeT Number;           /// invariant: Func->Nodes[Number]==this
   const SizeT NumberOrig; /// used for name auto-generation
   NodeString Name;
   SizeT LoopNestDepth = 0; /// the loop nest depth of this node
   bool HasReturn = false;  /// does this block need an epilog?
   bool NeedsPlacement = false;
   bool NeedsAlignment = false;       /// is sandboxing required?
   InstNumberT InstCountEstimate = 0; /// rough instruction count estimate
   NodeList InEdges;                  /// in no particular order
   NodeList OutEdges;                 /// in no particular order
   PhiList Phis;                      /// unordered set of phi instructions
   InstList Insts;                    /// ordered list of non-phi instructions
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICECFGNODE_H