From d79c7b43f4afeb2bb81128e7acf079ea9912a561 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Thu, 11 Nov 2004 07:47:54 +0000
Subject: [PATCH] Actually, leave the check in.  This prevents us from counting
 dead arguments as IPCP opportunities.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17680 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/IPO/IPConstantPropagation.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Transforms/IPO/IPConstantPropagation.cpp b/lib/Transforms/IPO/IPConstantPropagation.cpp
index 9daeb4fa5d9..bf2e3d72c3f 100644
--- a/lib/Transforms/IPO/IPConstantPropagation.cpp
+++ b/lib/Transforms/IPO/IPConstantPropagation.cpp
@@ -113,7 +113,7 @@ bool IPCP::processFunction(Function &F) {
   bool MadeChange = false;
   for (unsigned i = 0, e = ArgumentConstants.size(); i != e; ++i, ++AI)
     // Do we have a constant argument!?
-    if (!ArgumentConstants[i].second) {
+    if (!ArgumentConstants[i].second && !AI->use_empty()) {
       Value *V = ArgumentConstants[i].first;
       if (V == 0) V = UndefValue::get(AI->getType());
       AI->replaceAllUsesWith(V);