From 5d9cc1763beba95d3c8328ebac791513a3857fb2 Mon Sep 17 00:00:00 2001
From: Zhou Sheng <zhousheng00@gmail.com>
Date: Wed, 25 Feb 2009 15:34:27 +0000
Subject: Don't block basic block with only SwitchInst to fold into
 predecessors.

llvm-svn: 65456
---
 llvm/lib/Transforms/Utils/SimplifyCFG.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'llvm/lib/Transforms/Utils/SimplifyCFG.cpp')

diff --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
index 6c14a643e81..08c8a3f65e5 100644
--- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/llvm/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;
     }
-- 
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