diff --git a/llvm/lib/Transforms/IPO/IPO.cpp b/llvm/lib/Transforms/IPO/IPO.cpp
@@ -34,6 +34,7 @@ void llvm::initializeIPO(PassRegistry &Registry) {
   initializeGlobalDCELegacyPassPass(Registry);
   initializeGlobalOptLegacyPassPass(Registry);
   initializeGlobalSplitPass(Registry);
+  initializeHotColdSplittingLegacyPassPass(Registry);
   initializeIPCPPass(Registry);
   initializeAlwaysInlinerLegacyPassPass(Registry);
   initializeSimpleInlinerPass(Registry);

diff --git a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -104,6 +104,10 @@ static cl::opt<bool>
     EnablePrepareForThinLTO("prepare-for-thinlto", cl::init(false), cl::Hidden,
                             cl::desc("Enable preparation for ThinLTO."));
 
+cl::opt<bool> EnableHotColdSplit("hot-cold-split", cl::init(false), cl::Hidden,
+    cl::desc("Enable hot-cold splitting pass"));
+
+
 static cl::opt<bool> RunPGOInstrGen(
     "profile-generate", cl::init(false), cl::Hidden,
     cl::desc("Enable PGO instrumentation."));
@@ -497,6 +501,9 @@ void PassManagerBuilder::populateModulePassManager(
   // Infer attributes about declarations if possible.
   MPM.add(createInferFunctionAttrsLegacyPass());
 
+  if (EnableHotColdSplit)
+    MPM.add(createHotColdSplittingPass());
+
   addExtensionsToPM(EP_ModuleOptimizerEarly, MPM);
 
   if (OptLevel > 2)

diff --git a/llvm/test/Transforms/HotColdSplit/split-cold-1.ll b/llvm/test/Transforms/HotColdSplit/split-cold-1.ll
@@ -0,0 +1,34 @@
+; RUN: opt -hotcoldsplit -S < %s | FileCheck %s
+source_filename = "bugpoint-output-054409e.bc"
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.13.0"
+
+declare i32 @__gxx_personality_v0(...)
+
+; Outlined function is called from a basic block named codeRepl
+; CHECK: codeRepl:
+; CHECK-NEXT: call coldcc void @foo
+; Check that no recursive outlining is done.
+; CHECK-NOT: codeRepl:
+; Function Attrs: ssp uwtable
+define hidden void @foo() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
+entry:
+  br i1 undef, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  unreachable
+
+if.end:                                           ; preds = %entry
+  br label %if.then12
+
+if.then12:                                        ; preds = %if.end
+  br label %cleanup40
+
+cleanup40:                                        ; preds = %if.then12
+  br label %return
+
+return:                                           ; preds = %cleanup40
+  ret void
+}
+
+