Expand on my note-to-self
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12029 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/BasicAliasAnalysis.cpp b/lib/Analysis/BasicAliasAnalysis.cpp
index 0b131bc..16bb53f 100644
--- a/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/lib/Analysis/BasicAliasAnalysis.cpp
@@ -14,7 +14,9 @@
// FIXME: This could be extended for a very simple form of mod/ref information.
// If a pointer is locally allocated (either malloc or alloca) and never passed
// into a call or stored to memory, then we know that calls will not mod/ref the
-// memory. This can be important for tailcallelim.
+// memory. This can be important for tailcallelim, and can support CSE of loads
+// and dead store elimination across calls. This is particularly important for
+// stack allocated arrays.
//
//===----------------------------------------------------------------------===//