Count how many phis we are creating.

llvm-svn: 132748

llvm/lib/CodeGen/TailDuplication.cpp

@@ -34,6 +34,7 @@ STATISTIC(NumTails     , "Number of tails duplicated");
 STATISTIC(NumTailDups  , "Number of tail duplicated blocks");
 STATISTIC(NumInstrDups , "Additional instructions due to tail duplication");
 STATISTIC(NumDeadBlocks, "Number of dead blocks removed");
+STATISTIC(NumAddedPHIs , "Number of phis added");
 
 // Heuristic for tail duplication.
 static cl::opt<unsigned>
@@ -246,6 +247,7 @@ bool TailDuplicatePass::TailDuplicateBlocks(MachineFunction &MF) {
           }
         }
 
+        NumAddedPHIs += NewPHIs.size();
         SSAUpdateVRs.clear();
         SSAUpdateVals.clear();
       }