Fix longstanding thinko: don't exclude

predessors of exit blocks from tail merging
consideration.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52985 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp
index 6825bfb10339d6fac86f6a535c3e458cc168030f..87a77bb14f2089d7c4c6b85e97c5b2f1209963e9 100644 (file)
--- a/lib/CodeGen/BranchFolding.cpp
+++ b/lib/CodeGen/BranchFolding.cpp
@@ -697,8 +697,7 @@ bool BranchFolder::TailMergeBlocks(MachineFunction &MF) {
   // transformations.)
 
   for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) {
-    if (!I->succ_empty() && I->pred_size() >= 2 && 
-         I->pred_size() < TailMergeThreshold) {
+    if (I->pred_size() >= 2 && I->pred_size() < TailMergeThreshold) {
       MachineBasicBlock *IBB = I;
       MachineBasicBlock *PredBB = prior(I);
       MergePotentials.clear();