diff --git a/llvm/lib/Transforms/IPO/Inliner.cpp b/llvm/lib/Transforms/IPO/Inliner.cpp
--- a/llvm/lib/Transforms/IPO/Inliner.cpp
+++ b/llvm/lib/Transforms/IPO/Inliner.cpp
@@ -776,7 +776,9 @@
     if (CG.lookupSCC(N) != C)
       continue;
 
-    LLVM_DEBUG(dbgs() << "Inlining calls in: " << F.getName() << "\n");
+    LLVM_DEBUG(dbgs() << "Inlining calls in: " << F.getName() << "\n"
+                      << "    Function size: " << F.getInstructionCount()
+                      << "\n");
 
     auto GetAssumptionCache = [&](Function &F) -> AssumptionCache & {
       return FAM.getResult<AssumptionAnalysis>(F);
@@ -837,6 +839,9 @@
       InlinedCallees.insert(&Callee);
       ++NumInlined;
 
+      LLVM_DEBUG(dbgs() << "    Size after inlining: "
+                        << F.getInstructionCount() << "\n");
+
       // Add any new callsites to defined functions to the worklist.
       if (!IFI.InlinedCallSites.empty()) {
         int NewHistoryID = InlineHistory.size();