[BranchFolding] Unique added live-ins after hoisting code.

We're not supposed to have duplicate live-ins.

llvm-svn: 281224

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/BranchFolding.cpp b/llvm/lib/CodeGen/BranchFolding.cpp
index 06a82220875..0d4a0715a9e 100644
--- a/llvm/lib/CodeGen/BranchFolding.cpp
+++ b/llvm/lib/CodeGen/BranchFolding.cpp
@@ -1972,14 +1972,21 @@ bool BranchFolder::HoistCommonCodeInSuccs(MachineBasicBlock *MBB) {
   FBB->erase(FBB->begin(), FIB);
 
   // Update livein's.
+  bool AddedLiveIns = false;
   for (unsigned i = 0, e = LocalDefs.size(); i != e; ++i) {
     unsigned Def = LocalDefs[i];
     if (LocalDefsSet.count(Def)) {
       TBB->addLiveIn(Def);
       FBB->addLiveIn(Def);
+      AddedLiveIns = true;
     }
   }
 
+  if (AddedLiveIns) {
+    TBB->sortUniqueLiveIns();
+    FBB->sortUniqueLiveIns();
+  }
+
   ++NumHoist;
   return true;
 }