[CodeGen] Fix uninitialized variables exposed by r303084

All other calls of analyzeBranch reset PredTBB and PredFBB, so I assume it's
expected behavior.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@303581 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/TailDuplicator.cpp b/lib/CodeGen/TailDuplicator.cpp
index d2414200e9d579680d5560ba63d4c1b39ac66632..d40f7af431a9b7f2c278132578648a7a201068c1 100644 (file)
--- a/lib/CodeGen/TailDuplicator.cpp
+++ b/lib/CodeGen/TailDuplicator.cpp
@@ -749,7 +749,7 @@ bool TailDuplicator::canTailDuplicate(MachineBasicBlock *TailBB,
   if (PredBB->succ_size() > 1)
     return false;
 
-  MachineBasicBlock *PredTBB, *PredFBB;
+  MachineBasicBlock *PredTBB = nullptr, *PredFBB = nullptr;
   SmallVector<MachineOperand, 4> PredCond;
   if (TII->analyzeBranch(*PredBB, PredTBB, PredFBB, PredCond))
     return false;
@@ -832,7 +832,7 @@ bool TailDuplicator::tailDuplicate(bool IsSimple, MachineBasicBlock *TailBB,
     appendCopies(PredBB, CopyInfos, Copies);
 
     // Simplify
-    MachineBasicBlock *PredTBB, *PredFBB;
+    MachineBasicBlock *PredTBB = nullptr, *PredFBB = nullptr;
     SmallVector<MachineOperand, 4> PredCond;
     TII->analyzeBranch(*PredBB, PredTBB, PredFBB, PredCond);