From 7cd5d3e05ca9573dbac1a01846813037f901480c Mon Sep 17 00:00:00 2001
From: Bob Wilson <bob.wilson@apple.com>
Date: Wed, 18 Nov 2009 19:29:37 +0000
Subject: [PATCH] Add statistics for tail duplication.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89225 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/BranchFolding.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp
index 94bfb7204ba..e0a7825a26c 100644
--- a/lib/CodeGen/BranchFolding.cpp
+++ b/lib/CodeGen/BranchFolding.cpp
@@ -41,8 +41,11 @@ using namespace llvm;
 STATISTIC(NumDeadBlocks, "Number of dead blocks removed");
 STATISTIC(NumBranchOpts, "Number of branches optimized");
 STATISTIC(NumTailMerge , "Number of block tails merged");
+STATISTIC(NumTailDups  , "Number of tail duplicated blocks");
+
 static cl::opt<cl::boolOrDefault> FlagEnableTailMerge("enable-tail-merge",
                               cl::init(cl::BOU_UNSET), cl::Hidden);
+
 // Throttle for huge numbers of predecessors (compile speed problems)
 static cl::opt<unsigned>
 TailMergeThreshold("tail-merge-threshold",
@@ -1107,6 +1110,7 @@ bool BranchFolder::TailDuplicate(MachineBasicBlock *TailBB,
        PredBB->addSuccessor(*I);
 
     Changed = true;
+    ++NumTailDups;
   }
 
   // If TailBB was duplicated into all its predecessors except for the prior