From: Chris Lattner <sabre@nondot.org>
Date: Tue, 1 Feb 2005 00:18:30 +0000 (+0000)
Subject: Fix a problem where we could infinitely recurse on phi nodes.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=caa7c19fb4ca60e21dc8fa9b10c736a05a9f9c22;p=oota-llvm.git

Fix a problem where we could infinitely recurse on phi nodes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19955 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index ad08489cdb3..d400b4b3fd8 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/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