Index: llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp
===================================================================
--- llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp
+++ llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp
@@ -1590,11 +1590,6 @@
         (isa<Argument>(O2) && isIdentifiedFunctionLocal(O1)))
       return NoAlias;
 
-    // Most objects can't alias null.
-    if ((isa<ConstantPointerNull>(O2) && isKnownNonNull(O1)) ||
-        (isa<ConstantPointerNull>(O1) && isKnownNonNull(O2)))
-      return NoAlias;
-
     // If one pointer is the result of a call/invoke or load and the other is a
     // non-escaping local object within the same function, then we know the
     // object couldn't escape to a point where the call could return it.