I understand now. Shoot.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27819 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Analysis/DataStructure/Local.cpp b/lib/Analysis/DataStructure/Local.cpp
index a63edaa77756151f9b8a62d8733f09fa277ea47c..e4de3cb7321e6f9994a65835b4cf303a741d99b7 100644 (file)
--- a/lib/Analysis/DataStructure/Local.cpp
+++ b/lib/Analysis/DataStructure/Local.cpp
@@ -549,30 +549,12 @@ void GraphBuilder::visitCallSite(CallSite CS) {
       case Intrinsic::memcpy_i64:
       case Intrinsic::memmove_i32:
       case Intrinsic::memmove_i64: {
-        //This is over aggressive.  What these functions do is not make the 
-        // targets pointers alias, but rather merge the out edges of the graphs
-        // for the pointers according to the type merging of the graphs.
-        //Simply merging the two graphs is a crude approximation to this.
-       //Instead, copy the src pointer graph, then merge the copy with the
-       //dest pointer, thus avoiding contaminating the src with info from the dest
-        //I might be wrong though.
-
         // Merge the first & second arguments, and mark the memory read and
-        // modified.  Preserve second graph
+        // modified.
        DSNodeHandle RetNH = getValueDest(**CS.arg_begin());
-       DSNodeHandle SrcNH = getValueDest(**(CS.arg_begin()+1));
-       //copy dsnode
-       DSNode* copy = new DSNode(*SrcNH.getNode(), SrcNH.getNode()->getParentGraph());
-       //since this is the target memory, we only are interested in the links.
-       //the target will not wind up with a global memory object , unless it 
-       //was already there (only pointers to global memory objects)
-       copy->clearGlobals();
-       DSNodeHandle Copy( copy, SrcNH.getOffset());
-       RetNH.mergeWith(Copy);
+       RetNH.mergeWith(getValueDest(**(CS.arg_begin()+1)));
         if (DSNode *N = RetNH.getNode())
-          N->setModifiedMarker();
-       if (DSNode *N = SrcNH.getNode())
-         N->setReadMarker();
+          N->setModifiedMarker()->setReadMarker();
         return;
       }
       case Intrinsic::memset_i32: