[llvm-commits] [llvm] r47317 - /llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp

[Owen Anderson]

Author: resistor
Date: Tue Feb 19 00:47:18 2008
New Revision: 47317

URL: http://llvm.org/viewvc/llvm-project?rev=47317&view=rev
Log:
In addition to arguments passed to it, memcpy (and all other calls) can ModRef pointers that alias their arguments as well.  This fixes PR2057.

Modified:
    llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp

Modified: llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp?rev=47317&r1=47316&r2=47317&view=diff

==============================================================================
--- llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp (original)
+++ llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp Tue Feb 19 00:47:18 2008
@@ -263,7 +263,8 @@
           for (CallSite::arg_iterator CI = CS.arg_begin(), CE = CS.arg_end();
               CI != CE; ++CI)
             if (isa<PointerType>((*CI)->getType()) &&
-                getUnderlyingObject(*CI) == P)
+                ( getUnderlyingObject(*CI) == P ||
+                  alias(cast<Value>(CI), ~0ULL, P, ~0ULL) != NoAlias) )
               passedAsArg = true;
           
           if (!passedAsArg)