Index: llvm/trunk/include/llvm/Transforms/IPO/HotColdSplitting.h
===================================================================
--- llvm/trunk/include/llvm/Transforms/IPO/HotColdSplitting.h
+++ llvm/trunk/include/llvm/Transforms/IPO/HotColdSplitting.h
@@ -0,0 +1,31 @@
+//===- HotColdSplitting.h ---- Outline Cold Regions -------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//===----------------------------------------------------------------------===//
+//
+// This pass outlines cold regions to a separate function.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_IPO_HOTCOLDSPLITTING_H
+#define LLVM_TRANSFORMS_IPO_HOTCOLDSPLITTING_H
+
+#include "llvm/IR/PassManager.h"
+
+namespace llvm {
+
+class Module;
+
+/// Pass to outline cold regions.
+class HotColdSplittingPass : public PassInfoMixin<HotColdSplittingPass> {
+public:
+  PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM);
+};
+
+} // end namespace llvm
+
+#endif // LLVM_TRANSFORMS_IPO_HOTCOLDSPLITTING_H
+
Index: llvm/trunk/lib/Passes/PassBuilder.cpp
===================================================================
--- llvm/trunk/lib/Passes/PassBuilder.cpp
+++ llvm/trunk/lib/Passes/PassBuilder.cpp
@@ -75,6 +75,7 @@
 #include "llvm/Transforms/IPO/GlobalDCE.h"
 #include "llvm/Transforms/IPO/GlobalOpt.h"
 #include "llvm/Transforms/IPO/GlobalSplit.h"
+#include "llvm/Transforms/IPO/HotColdSplitting.h"
 #include "llvm/Transforms/IPO/InferFunctionAttrs.h"
 #include "llvm/Transforms/IPO/Inliner.h"
 #include "llvm/Transforms/IPO/Internalize.h"
@@ -198,6 +199,8 @@
     EnableCHR("enable-chr-npm", cl::init(true), cl::Hidden,
               cl::desc("Enable control height reduction optimization (CHR)"));
 
+extern cl::opt<bool> EnableHotColdSplit;
+
 static bool isOptimizingForSize(PassBuilder::OptimizationLevel Level) {
   switch (Level) {
   case PassBuilder::O0:
@@ -614,6 +617,9 @@
                                            true));
   }
 
+  if (EnableHotColdSplit)
+    MPM.addPass(HotColdSplittingPass());
+
   // Interprocedural constant propagation now that basic cleanup has occurred
   // and prior to optimizing globals.
   // FIXME: This position in the pipeline hasn't been carefully considered in
Index: llvm/trunk/lib/Passes/PassRegistry.def
===================================================================
--- llvm/trunk/lib/Passes/PassRegistry.def
+++ llvm/trunk/lib/Passes/PassRegistry.def
@@ -51,6 +51,7 @@
 MODULE_PASS("globaldce", GlobalDCEPass())
 MODULE_PASS("globalopt", GlobalOptPass())
 MODULE_PASS("globalsplit", GlobalSplitPass())
+MODULE_PASS("hotcoldsplit", HotColdSplittingPass())
 MODULE_PASS("inferattrs", InferFunctionAttrsPass())
 MODULE_PASS("insert-gcov-profiling", GCOVProfilerPass())
 MODULE_PASS("instrprof", InstrProfiling())
Index: llvm/trunk/lib/Transforms/IPO/HotColdSplitting.cpp
===================================================================
--- llvm/trunk/lib/Transforms/IPO/HotColdSplitting.cpp
+++ llvm/trunk/lib/Transforms/IPO/HotColdSplitting.cpp
@@ -44,6 +44,7 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Transforms/IPO.h"
+#include "llvm/Transforms/IPO/HotColdSplitting.h"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/Transforms/Utils/BasicBlockUtils.h"
 #include "llvm/Transforms/Utils/Cloning.h"
@@ -409,6 +410,38 @@
   return HotColdSplitting(PSI, GBFI, GTTI, &GetORE).run(M);
 }
 
+PreservedAnalyses
+HotColdSplittingPass::run(Module &M, ModuleAnalysisManager &AM) {
+  auto &FAM = AM.getResult<FunctionAnalysisManagerModuleProxy>(M).getManager();
+
+  std::function<AssumptionCache &(Function &)> GetAssumptionCache =
+      [&FAM](Function &F) -> AssumptionCache & {
+    return FAM.getResult<AssumptionAnalysis>(F);
+  };
+
+  auto GBFI = [&FAM](Function &F) {
+    return &FAM.getResult<BlockFrequencyAnalysis>(F);
+  };
+
+  std::function<TargetTransformInfo &(Function &)> GTTI =
+      [&FAM](Function &F) -> TargetTransformInfo & {
+    return FAM.getResult<TargetIRAnalysis>(F);
+  };
+
+  std::unique_ptr<OptimizationRemarkEmitter> ORE;
+  std::function<OptimizationRemarkEmitter &(Function &)> GetORE =
+      [&ORE](Function &F) -> OptimizationRemarkEmitter & {
+    ORE.reset(new OptimizationRemarkEmitter(&F));
+    return *ORE.get();
+  };
+
+  ProfileSummaryInfo *PSI = &AM.getResult<ProfileSummaryAnalysis>(M);
+
+  if (HotColdSplitting(PSI, GBFI, GTTI, &GetORE).run(M))
+    return PreservedAnalyses::none();
+  return PreservedAnalyses::all();
+}
+
 char HotColdSplittingLegacyPass::ID = 0;
 INITIALIZE_PASS_BEGIN(HotColdSplittingLegacyPass, "hotcoldsplit",
                       "Hot Cold Splitting", false, false)
Index: llvm/trunk/test/Transforms/HotColdSplit/split-cold-1.ll
===================================================================
--- llvm/trunk/test/Transforms/HotColdSplit/split-cold-1.ll
+++ llvm/trunk/test/Transforms/HotColdSplit/split-cold-1.ll
@@ -1,4 +1,5 @@
 ; RUN: opt -hotcoldsplit -S < %s | FileCheck %s
+; RUN: opt -passes=hotcoldsplit -S < %s | FileCheck %s
 
 ; Outlined function is called from a basic block named codeRepl
 ; CHECK: codeRepl:
Index: llvm/trunk/test/Transforms/HotColdSplit/split-cold-2.ll
===================================================================
--- llvm/trunk/test/Transforms/HotColdSplit/split-cold-2.ll
+++ llvm/trunk/test/Transforms/HotColdSplit/split-cold-2.ll
@@ -1,4 +1,5 @@
 ; RUN: opt -hotcoldsplit -S < %s
+; RUN: opt -passes=hotcoldsplit -S < %s
 
 ; Make sure this compiles. This test used to fail with an invalid phi node: the
 ; two predecessors were outlined and the SSA representation was invalid.