revert this, this is safe, if conservative. leave a note to that effect
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27428 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/DataStructure/Local.cpp b/lib/Analysis/DataStructure/Local.cpp
index c87e9c4..72eee24 100644
--- a/lib/Analysis/DataStructure/Local.cpp
+++ b/lib/Analysis/DataStructure/Local.cpp
@@ -546,17 +546,15 @@
case Intrinsic::vaend:
return; // noop
case Intrinsic::memcpy_i32:
- case Intrinsic::memcpy_i64: {
- //write first location
- if (DSNode *N = getValueDest(**CS.arg_begin()).getNode())
- N->setModifiedMarker();
- //and read second pointer
- if (DSNode *N = getValueDest(**(CS.arg_begin() + 1)).getNode())
- N->setReadMarker();
- return;
- }
+ 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.
+ //I might be wrong though.
+
// Merge the first & second arguments, and mark the memory read and
// modified.
DSNodeHandle RetNH = getValueDest(**CS.arg_begin());