diff --git a/lib/CodeGen/SplitKit.cpp b/lib/CodeGen/SplitKit.cpp
index ddd95e6adc1..a37a4d60038 100644
--- a/lib/CodeGen/SplitKit.cpp
+++ b/lib/CodeGen/SplitKit.cpp
@@ -573,6 +573,8 @@ void SplitEditor::rewrite() {
     LiveInterval &li = *intervals_[i];
     vrai.CalculateRegClass(li.reg);
     vrai.CalculateWeightAndHint(li);
+    DEBUG(dbgs() << "new intv " << mri_.getRegClass(li.reg)->getName() << ":"
+                 << li << '\n');
   }
 }