[msan] Add a fixme note for a minor deficiency.

llvm-svn: 319708

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
index 44190a2c312..c034a833bed 100644
--- a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
@@ -2772,6 +2772,8 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
         setOrigin(&I, getCleanOrigin());
         return;
       }
+      // FIXME: NextInsn is likely in a basic block that has not been visited yet.
+      // Anything inserted there will be instrumented by MSan later!
       NextInsn = NormalDest->getFirstInsertionPt();
       assert(NextInsn != NormalDest->end() &&
              "Could not find insertion point for retval shadow load");