[LoopSimplify] Reuse changeToUnreachable

Use existing functionality provided in changeToUnreachable instead of
reinventing it in LoopSimplify.

No functionality change is intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@258663 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Utils/LoopSimplify.cpp b/lib/Transforms/Utils/LoopSimplify.cpp
index 1fa4695..f17b26c 100644 (file)
--- a/lib/Transforms/Utils/LoopSimplify.cpp
+++ b/lib/Transforms/Utils/LoopSimplify.cpp
@@ -489,14 +489,9 @@ ReprocessLoop:
       DEBUG(dbgs() << "LoopSimplify: Deleting edge from dead predecessor "
                    << P->getName() << "\n");
 
-      // Inform each successor of each dead pred.
-      for (succ_iterator SI = succ_begin(P), SE = succ_end(P); SI != SE; ++SI)
-        (*SI)->removePredecessor(P);
       // Zap the dead pred's terminator and replace it with unreachable.
       TerminatorInst *TI = P->getTerminator();
-       TI->replaceAllUsesWith(UndefValue::get(TI->getType()));
-      P->getTerminator()->eraseFromParent();
-      new UnreachableInst(P->getContext(), P);
+      changeToUnreachable(TI, /*UseLLVMTrap=*/false);
       Changed = true;
     }
   }