From 5bef0eb1de5f52662de7b4808bee5e9d643b04db Mon Sep 17 00:00:00 2001
From: Nick Lewycky <nicholas@mxc.ca>
Date: Mon, 24 Oct 2011 05:51:01 +0000
Subject: [PATCH] PHI nodes not in the loop header aren't part of the loop
 iteration initial state. Furthermore, they might not have two operands. This
 fixes the underlying issue behind the crashes introduced in r142781.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142788 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Analysis/ScalarEvolution.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index 2da8e6fbd63..1e4bf19e849 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -4856,7 +4856,7 @@ ScalarEvolution::getConstantEvolutionLoopExitValue(PHINode *PN,
     for (DenseMap<Instruction *, Constant *>::const_iterator
            I = CurrentIterVals.begin(), E = CurrentIterVals.end(); I != E; ++I){
       PHINode *PHI = dyn_cast<PHINode>(I->first);
-      if (!PHI || PHI == PN) continue;
+      if (!PHI || PHI == PN || PHI->getParent() != Header) continue;
       Constant *&NextPHI = NextIterVals[PHI];
       if (NextPHI) continue;    // Already computed!