diff --git a/bolt/lib/Rewrite/BoltDiff.cpp b/bolt/lib/Rewrite/BoltDiff.cpp
--- a/bolt/lib/Rewrite/BoltDiff.cpp
+++ b/bolt/lib/Rewrite/BoltDiff.cpp
@@ -83,6 +83,11 @@
              "collection time and sampling rate for this to make sense"),
     cl::cat(BoltDiffCategory));
 
+static cl::opt<bool> SkipNonSimple(
+    "skip-non-simple",
+    cl::desc("skip non-simple functions in reporting"),
+    cl::cat(BoltDiffCategory));
+
 } // end namespace opts
 
 namespace llvm {
@@ -537,6 +542,8 @@
         Score2 = LTOAggregatedScore2[Iter2->second];
       if (Score1 == 0.0 || Score2 == 0.0)
         continue;
+      if (opts::SkipNonSimple && !Func1->isSimple() && !Func2->isSimple())
+        continue;
       LargestDiffs.insert(
           std::make_pair<>(std::abs(Score1 - Score2), MapEntry));
       ScoreMap[Func2] = std::make_pair<>(Score1, Score2);