From 3ff699e93c8ae7b636ddb4493a88206a72371506 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Thu, 14 Feb 2008 19:18:13 +0000
Subject: Fix PR2029

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47129 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Utils/LowerInvoke.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'lib/Transforms/Utils')

diff --git a/lib/Transforms/Utils/LowerInvoke.cpp b/lib/Transforms/Utils/LowerInvoke.cpp
index 39738a09ba..920a0286ea 100644
--- a/lib/Transforms/Utils/LowerInvoke.cpp
+++ b/lib/Transforms/Utils/LowerInvoke.cpp
@@ -256,6 +256,17 @@ void LowerInvoke::rewriteExpensiveInvoke(InvokeInst *II, unsigned InvokeNo,
                                          SwitchInst *CatchSwitch) {
   ConstantInt *InvokeNoC = ConstantInt::get(Type::Int32Ty, InvokeNo);
 
+  // If the unwind edge has phi nodes, split the edge.
+  if (isa<PHINode>(II->getUnwindDest()->begin())) {
+    SplitCriticalEdge(II, 1, this);
+   
+    // If there are any phi nodes left, they must have a single predecessor.
+    while (PHINode *PN = dyn_cast<PHINode>(II->getUnwindDest()->begin())) {
+      PN->replaceAllUsesWith(PN->getIncomingValue(0));
+      PN->eraseFromParent();
+    }
+  }
+  
   // Insert a store of the invoke num before the invoke and store zero into the
   // location afterward.
   new StoreInst(InvokeNoC, InvokeNum, true, II);  // volatile
-- 
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