diff --git a/llvm/include/llvm/LTO/legacy/LTOCodeGenerator.h b/llvm/include/llvm/LTO/legacy/LTOCodeGenerator.h
--- a/llvm/include/llvm/LTO/legacy/LTOCodeGenerator.h
+++ b/llvm/include/llvm/LTO/legacy/LTOCodeGenerator.h
@@ -193,6 +193,8 @@
   void resetMergedModule() { MergedModule.reset(); }
   void DiagnosticHandler(const DiagnosticInfo &DI);
 
+  Module &getMergedModule() { return *MergedModule; }
+
 private:
   /// Verify the merged module on first call.
   ///
diff --git a/llvm/tools/llvm-lto/llvm-lto.cpp b/llvm/tools/llvm-lto/llvm-lto.cpp
--- a/llvm/tools/llvm-lto/llvm-lto.cpp
+++ b/llvm/tools/llvm-lto/llvm-lto.cpp
@@ -197,6 +197,11 @@
                    cl::desc("Write merged LTO module to file before CodeGen"),
                    cl::cat(LTOCategory));
 
+static cl::opt<bool>
+    DumpLinkedModule("dump-linked-module", cl::init(false),
+                     cl::desc("Dump linked LTO module before optimize"),
+                     cl::cat(LTOCategory));
+
 static cl::list<std::string> InputFilenames(cl::Positional, cl::OneOrMore,
                                             cl::desc("<input bitcode files>"),
                                             cl::cat(LTOCategory));
@@ -316,11 +321,11 @@
       if (!CurrentActivity.empty())
         OS << ' ' << CurrentActivity;
       OS << ": ";
-  
+
       DiagnosticPrinterRawOStream DP(OS);
       DI.print(DP);
       OS << '\n';
-  
+
       if (DI.getSeverity() == DS_Error)
         exit(1);
       return true;
@@ -1115,6 +1120,14 @@
       error("error compiling the code");
 
   } else {
+    if (DumpLinkedModule) {
+      if (SaveLinkedModuleFile)
+        error(": -dump-linked-module must be used without -dump-linked-module");
+
+      Module &M = CodeGen.getMergedModule();
+      M.dump();
+    }
+
     if (Parallelism != 1)
       error("-j must be specified together with -o");