complete comment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66055 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/ScalarReplAggregates.cpp b/lib/Transforms/Scalar/ScalarReplAggregates.cpp
index b333867..441b448 100644
--- a/lib/Transforms/Scalar/ScalarReplAggregates.cpp
+++ b/lib/Transforms/Scalar/ScalarReplAggregates.cpp
@@ -721,7 +721,9 @@
SmallVector<AllocaInst*, 32> &NewElts) {
// If this is a memcpy/memmove, construct the other pointer as the
- // appropriate type. The "Other" pointer is the pointer that goes to
+ // appropriate type. The "Other" pointer is the pointer that goes to memory
+ // that doesn't have anything to do with the alloca that we are promoting. For
+ // memset, this Value* stays null.
Value *OtherPtr = 0;
unsigned MemAlignment = MI->getAlignment()->getZExtValue();
if (MemCpyInst *MCI = dyn_cast<MemCpyInst>(MI)) {