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 b3338676ce3196243f70d62269e31734684a15f8..441b448c010760fcbc4ac4ac27099c90540199d3 100644 (file)
--- a/lib/Transforms/Scalar/ScalarReplAggregates.cpp
+++ b/lib/Transforms/Scalar/ScalarReplAggregates.cpp
@@ -721,7 +721,9 @@ void SROA::RewriteMemIntrinUserOfAlloca(MemIntrinsic *MI, Instruction *BCInst,
                                         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)) {