Don't block basic block with only SwitchInst to fold into predecessors.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65456 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 1 deletions

diff --git a/lib/Transforms/Utils/SimplifyCFG.cpp b/lib/Transforms/Utils/SimplifyCFG.cpp
index 6c14a643e8..08c8a3f65e 100644
--- a/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -1887,7 +1887,11 @@ bool llvm::SimplifyCFG(BasicBlock *BB) {
 
       // If the block only contains the switch, see if we can fold the block
       // away into any preds.
-      if (SI == &BB->front())
+      BasicBlock::iterator BBI = BB->begin();
+      // Ignore dbg intrinsics.
+      while (isa<DbgInfoIntrinsic>(BBI))
+        ++BBI;
+      if (SI == &*BBI)
         if (FoldValueComparisonIntoPredecessors(SI))
           return SimplifyCFG(BB) || 1;
     }