Merge r98845 from mainline.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_27@99291 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/MachineJumpTableInfo.h

@@ -79,7 +79,11 @@ public:
   /// getEntryAlignment - Return the alignment of each entry in the jump table.
   unsigned getEntryAlignment(const TargetData &TD) const;
   
-  /// getJumpTableIndex - Create a new jump table or return an existing one.
+  /// createJumpTableIndex - Create a new jump table.
+  ///
+  unsigned createJumpTableIndex(const std::vector<MachineBasicBlock*> &DestBBs);
+  
+  /// getJumpTableIndex - Return the index for an existing jump table.
   ///
   unsigned getJumpTableIndex(const std::vector<MachineBasicBlock*> &DestBBs);
   

lib/CodeGen/MachineFunction.cpp

@@ -594,16 +594,25 @@ unsigned MachineJumpTableInfo::getEntryAlignment(const TargetData &TD) const {
   return ~0;
 }
 
-/// getJumpTableIndex - Create a new jump table entry in the jump table info
-/// or return an existing one.
+/// createJumpTableIndex - Create a new jump table entry in the jump table info.
 ///
-unsigned MachineJumpTableInfo::getJumpTableIndex(
+unsigned MachineJumpTableInfo::createJumpTableIndex(
                                const std::vector<MachineBasicBlock*> &DestBBs) {
   assert(!DestBBs.empty() && "Cannot create an empty jump table!");
   JumpTables.push_back(MachineJumpTableEntry(DestBBs));
   return JumpTables.size()-1;
 }
 
+/// getJumpTableIndex - Return the index for an existing jump table entry in
+/// the jump table info.
+unsigned MachineJumpTableInfo::getJumpTableIndex(
+                               const std::vector<MachineBasicBlock*> &DestBBs) {
+  for (unsigned i = 0, e = JumpTables.size(); i != e; ++i)
+    if (JumpTables[i].MBBs == DestBBs)
+      return i;
+  assert(false && "getJumpTableIndex failed to find matching table");
+  return ~0;
+}
 
 /// ReplaceMBBInJumpTables - If Old is the target of any jump tables, update
 /// the jump tables to branch to New instead.

lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

@@ -1674,11 +1674,10 @@ bool SelectionDAGBuilder::handleJTSwitchCase(CaseRec& CR,
     }
   }
 
-  // Create a jump table index for this jump table, or return an existing
-  // one.
+  // Create a jump table index for this jump table.
   unsigned JTEncoding = TLI.getJumpTableEncoding();
   unsigned JTI = CurMF->getOrCreateJumpTableInfo(JTEncoding)
-                       ->getJumpTableIndex(DestBBs);
+                       ->createJumpTableIndex(DestBBs);
 
   // Set the jump table information so that we can codegen it as a second
   // MachineBasicBlock