From 1230cf25bafa057498cfbf1e6186f841b8f67ebb Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Tue, 1 Feb 2005 00:18:30 +0000
Subject: [PATCH] Fix a problem where we could infinitely recurse on phi nodes.

llvm-svn: 19955
---
 llvm/lib/Analysis/ScalarEvolution.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
index ad08489cdb36..d400b4b3fd85 100644
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -1163,7 +1163,7 @@ void ScalarEvolutionsImpl::UpdatePHIUserScalarEntries(Instruction *I,
                                         std::set<Instruction*> &UpdatedInsts) {
   std::map<Value*, SCEVHandle>::iterator SI = Scalars.find(I);
   if (SI == Scalars.end()) return;   // This scalar wasn't previous processed.
-  if (UpdatedInsts.insert(I).second) {
+  if (UpdatedInsts.insert(I).second && !isa<PHINode>(PN)) {
     Scalars.erase(SI);                 // Remove the old entry
     getSCEV(I);                        // Calculate the new entry
     
-- 
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