From ed3dcdbdb8f99555230f23ee0f1d59e7c7528b4f Mon Sep 17 00:00:00 2001
From: Nick Lewycky <nicholas@mxc.ca>
Date: Wed, 19 Aug 2009 06:24:33 +0000
Subject: [PATCH] Be more careful when modifying PHI nodes. Patch by Andre
 Tavares.

llvm-svn: 79407
---
 lib/Transforms/Utils/SSI.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/Transforms/Utils/SSI.cpp b/lib/Transforms/Utils/SSI.cpp
index 7bb9495f3cf..b4e683417cc 100644
--- a/lib/Transforms/Utils/SSI.cpp
+++ b/lib/Transforms/Utils/SSI.cpp
@@ -316,7 +316,8 @@ void SSI::fixPhis() {
     for (unsigned i = 0, e = PN->getNumIncomingValues(); i < e; ++i) {
       PHINode *PN_father;
       if ((PN_father = dyn_cast<PHINode>(PN->getIncomingValue(i))) &&
-          PN->getParent() == PN_father->getParent()) {
+          PN->getParent() == PN_father->getParent() &&
+          !DT_->dominates(PN->getParent(), PN->getIncomingBlock(i))) {
         BasicBlock *BB = PN->getIncomingBlock(i);
         int pos = PN_father->getBasicBlockIndex(BB);
         PN->setIncomingValue(i, PN_father->getIncomingValue(pos));