diff --git a/llvm/lib/Transforms/Scalar/LoopRotation.cpp b/llvm/lib/Transforms/Scalar/LoopRotation.cpp
--- a/llvm/lib/Transforms/Scalar/LoopRotation.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopRotation.cpp
@@ -30,7 +30,7 @@
 #define DEBUG_TYPE "loop-rotate"
 
 static cl::opt<unsigned> DefaultRotationThreshold(
-    "rotation-max-header-size", cl::init(16), cl::Hidden,
+    "rotation-max-header-size", cl::init(64), cl::Hidden,
     cl::desc("The default maximum header size for automatic loop rotation"));
 
 LoopRotatePass::LoopRotatePass(bool EnableHeaderDuplication)