From 4e744af80c583ee92f0bcff3fdb082bcd8e7386b Mon Sep 17 00:00:00 2001
From: Owen Anderson <resistor@mac.com>
Date: Wed, 14 Jun 2006 04:43:14 +0000
Subject: [PATCH] When asked not to delete useless PHIs, really don't delete
 them, no matter how redundant they are.

llvm-svn: 28777
---
 llvm/lib/VMCore/BasicBlock.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/VMCore/BasicBlock.cpp b/llvm/lib/VMCore/BasicBlock.cpp
index 18a90d6b443d..1b7100c68b21 100644
--- a/llvm/lib/VMCore/BasicBlock.cpp
+++ b/llvm/lib/VMCore/BasicBlock.cpp
@@ -213,7 +213,8 @@ void BasicBlock::removePredecessor(BasicBlock *Pred,
       PN->removeIncomingValue(Pred, false);
       // If all incoming values to the Phi are the same, we can replace the Phi
       // with that value.
-      if (Value *PNV = PN->hasConstantValue()) {
+      Value* PNV = 0;
+      if (!DontDeleteUselessPHIs && (PNV = PN->hasConstantValue())) {
         PN->replaceAllUsesWith(PNV);
         PN->eraseFromParent();
       }