From 4ec2e4c57896fa6e301f5f5a02669287c3116393 Mon Sep 17 00:00:00 2001
From: Reid Spencer <rspencer@reidspencer.com>
Date: Sun, 18 Jul 2004 00:01:50 +0000
Subject: [PATCH] bug 122: - Correct isa<Constant> for GlobalValue subclass

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14933 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/VMCore/Value.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/lib/VMCore/Value.cpp b/lib/VMCore/Value.cpp
index a4f2669de01..d14d1656a47 100644
--- a/lib/VMCore/Value.cpp
+++ b/lib/VMCore/Value.cpp
@@ -15,6 +15,7 @@
 #include "llvm/SymbolTable.h"
 #include "llvm/DerivedTypes.h"
 #include "llvm/Constant.h"
+#include "llvm/GlobalValue.h"
 #include "Support/LeakDetector.h"
 #include <algorithm>
 #include <iostream>
@@ -71,7 +72,10 @@ void Value::uncheckedReplaceAllUsesWith(Value *New) {
     // Must handle Constants specially, we cannot call replaceUsesOfWith on a
     // constant!
     if (Constant *C = dyn_cast<Constant>(U.getUser())) {
-      C->replaceUsesOfWithOnConstant(this, New, true);
+      if (!isa<GlobalValue>(C))
+        C->replaceUsesOfWithOnConstant(this, New, true);
+      else 
+        U.set(New);
     } else {
       U.set(New);
     }
@@ -97,7 +101,7 @@ void Value::replaceAllUsesWith(Value *New) {
 void User::replaceUsesOfWith(Value *From, Value *To) {
   if (From == To) return;   // Duh what?
 
-  assert(!isa<Constant>(this) &&
+  assert(!isa<Constant>(this) || isa<GlobalValue>(this) &&
          "Cannot call User::replaceUsesofWith on a constant!");
 
   for (unsigned i = 0, E = getNumOperands(); i != E; ++i)
@@ -108,3 +112,4 @@ void User::replaceUsesOfWith(Value *From, Value *To) {
       setOperand(i, To); // Fix it now...
     }
 }
+
-- 
2.34.1