From: Stuart Hastings <stuart@apple.com>
Date: Tue, 10 May 2011 21:20:03 +0000 (+0000)
Subject: Correctly walk through nested and adjacent CALLSEQ_START nodes.  No
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=d673057c968ee6da2fc9084a26cbd1a500002d2b;p=oota-llvm.git

Correctly walk through nested and adjacent CALLSEQ_START nodes.  No
test case; I've only seen this on a release branch, and I can't get it
to reproduce on trunk.  rdar://problem/7662569


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131152 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 2b6c56eafd7..e2e6691ba7c 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -324,6 +324,7 @@ static SDNode *FindCallStartFromCallEnd(SDNode *Node) {
     case ISD::CALLSEQ_START:
       if (!nested)
         return Node;
+      Node = Node->getOperand(0).getNode();
       nested--;
       break;
     case ISD::CALLSEQ_END:
@@ -331,7 +332,7 @@ static SDNode *FindCallStartFromCallEnd(SDNode *Node) {
       break;
     }
   }
-  return 0;
+  return (Node->getOpcode() == ISD::CALLSEQ_START) ? Node : 0;
 }
 
 /// LegalizeAllNodesNotLeadingTo - Recursively walk the uses of N, looking to