Introduction of improved switch lowering.

src/IceInstX86BaseImpl.h

 //===- subzero/src/IceInstX86BaseImpl.h - Generic X86 instructions -*- C++ -*=//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 134 matching lines @@
     assert(Condition != InstX86Base<Machine>::Traits::Cond::Br_None);
     Condition = this->getOppositeCondition(Condition);
     TargetTrue = getTargetFalse();
     TargetFalse = nullptr;
     return true;
   }
   return false;
 }
 
 template <class Machine>
-bool InstX86Br<Machine>::repointEdge(CfgNode *OldNode, CfgNode *NewNode) {
+bool InstX86Br<Machine>::repointEdges(CfgNode *OldNode, CfgNode *NewNode) {
+  bool Found = false;
   if (TargetFalse == OldNode) {
     TargetFalse = NewNode;
-    return true;
-  } else if (TargetTrue == OldNode) {
+    Found = true;
+  }
+  if (TargetTrue == OldNode) {
     TargetTrue = NewNode;
-    return true;
+    Found = true;
   }
-  return false;
+  return Found;
 }
 
 template <class Machine>
 InstX86Jmp<Machine>::InstX86Jmp(Cfg *Func, Operand *Target)
     : InstX86Base<Machine>(Func, InstX86Base<Machine>::Jmp, 1, nullptr) {
   this->addSource(Target);
 }
 
 template <class Machine>
 InstX86Call<Machine>::InstX86Call(Cfg *Func, Variable *Dest,
@@ skipping 2979 matching lines @@
   Type Ty = this->getSrc(0)->getType();
   Str << "xchg." << Ty << " ";
   this->dumpSources(Func);
 }
 
 } // end of namespace X86Internal
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEINSTX86BASEIMPL_H