Index: clang/lib/CodeGen/BackendUtil.cpp
===================================================================
--- clang/lib/CodeGen/BackendUtil.cpp
+++ clang/lib/CodeGen/BackendUtil.cpp
@@ -1217,6 +1217,9 @@
   PB.registerLoopAnalyses(LAM);
   PB.crossRegisterProxies(LAM, FAM, CGAM, MAM);
 
+  if (TM)
+    TM->registerPassBuilderCallbacks(PB, CodeGenOpts.DebugPassManager);
+
   ModulePassManager MPM(CodeGenOpts.DebugPassManager);
 
   if (!CodeGenOpts.DisableLLVMPasses) {
Index: llvm/include/llvm/Target/TargetMachine.h
===================================================================
--- llvm/include/llvm/Target/TargetMachine.h
+++ llvm/include/llvm/Target/TargetMachine.h
@@ -34,6 +34,7 @@
 class MCSubtargetInfo;
 class MCSymbol;
 class raw_pwrite_stream;
+class PassBuilder;
 class PassManagerBuilder;
 struct PerFunctionMIParsingState;
 class SMDiagnostic;
@@ -293,6 +294,11 @@
   /// PassManagerBuilder::addExtension.
   virtual void adjustPassManager(PassManagerBuilder &) {}
 
+  /// Allow the target to modify the pass pipeline with New Pass Manager
+  /// (similar to adjustPassManager for Legacy Pass manager).
+  virtual void registerPassBuilderCallbacks(PassBuilder &,
+                                            bool DebugPassManager = false) {}
+
   /// Add passes to the specified pass manager to get the specified file
   /// emitted.  Typically this will involve several steps of code generation.
   /// This method should return true if emission of this file type is not
Index: llvm/lib/Target/Hexagon/HexagonTargetMachine.h
===================================================================
--- llvm/lib/Target/Hexagon/HexagonTargetMachine.h
+++ llvm/lib/Target/Hexagon/HexagonTargetMachine.h
@@ -37,6 +37,8 @@
   static unsigned getModuleMatchQuality(const Module &M);
 
   void adjustPassManager(PassManagerBuilder &PMB) override;
+  void registerPassBuilderCallbacks(PassBuilder &PB,
+                                    bool DebugPassManager) override;
   TargetPassConfig *createPassConfig(PassManagerBase &PM) override;
   TargetTransformInfo getTargetTransformInfo(const Function &F) override;
 
Index: llvm/lib/Target/Hexagon/HexagonTargetMachine.cpp
===================================================================
--- llvm/lib/Target/Hexagon/HexagonTargetMachine.cpp
+++ llvm/lib/Target/Hexagon/HexagonTargetMachine.cpp
@@ -22,6 +22,7 @@
 #include "llvm/CodeGen/TargetPassConfig.h"
 #include "llvm/IR/LegacyPassManager.h"
 #include "llvm/IR/Module.h"
+#include "llvm/Passes/PassBuilder.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Transforms/IPO/PassManagerBuilder.h"
@@ -273,6 +274,18 @@
       });
 }
 
+void HexagonTargetMachine::registerPassBuilderCallbacks(PassBuilder &PB,
+                                                        bool DebugPassManager) {
+  PB.registerOptimizerLastEPCallback(
+      [=](ModulePassManager &MPM, PassBuilder::OptimizationLevel Level) {
+        LoopPassManager LPM(DebugPassManager);
+        FunctionPassManager FPM(DebugPassManager);
+        LPM.addPass(HexagonVectorLoopCarriedReusePass());
+        FPM.addPass(createFunctionToLoopPassAdaptor(std::move(LPM)));
+        MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
+      });
+}
+
 TargetTransformInfo
 HexagonTargetMachine::getTargetTransformInfo(const Function &F) {
   return TargetTransformInfo(HexagonTTIImpl(this, F));
Index: llvm/test/Other/new-pm-defaults.ll
===================================================================
--- llvm/test/Other/new-pm-defaults.ll
+++ llvm/test/Other/new-pm-defaults.ll
@@ -87,6 +87,15 @@
 ; RUN:     | FileCheck %s --check-prefix=CHECK-O --check-prefix=CHECK-O3 \
 ; RUN:     --check-prefix=%llvmcheckext \
 ; RUN:     --check-prefix=CHECK-EP-OPTIMIZER-LAST --check-prefix=CHECK-O23SZ
+; RUN: opt -mtriple=hexagon -disable-verify -debug-pass-manager \
+; RUN:     -disable-output -passes='default<O1>' -S %s 2>&1 \
+; RUN:     | FileCheck %s --check-prefix=HEX-O
+; RUN: opt -mtriple=hexagon -disable-verify -debug-pass-manager \
+; RUN:     -disable-output -passes='default<O2>' -S %s 2>&1 \
+; RUN:     | FileCheck %s --check-prefix=HEX-O
+; RUN: opt -mtriple=hexagon -disable-verify -debug-pass-manager \
+; RUN:     -disable-output -passes='default<O3>' -S %s 2>&1 \
+; RUN:     | FileCheck %s --check-prefix=HEX-O
 
 ; CHECK-O: Starting llvm::Module pass manager run.
 ; CHECK-O-NEXT: Starting llvm::Module pass manager run.
@@ -291,6 +300,9 @@
 ; CHECK-O-NEXT: }
 ;
 ; CHECK-O-NEXT: Finished llvm::Module pass manager run.
+;
+; Test TargetMachine::registerPassBuilderCallbacks
+; HEX-O: Running pass: HexagonVectorLoopCarriedReusePass
 
 declare void @bar() local_unnamed_addr
 
Index: llvm/tools/opt/NewPMDriver.cpp
===================================================================
--- llvm/tools/opt/NewPMDriver.cpp
+++ llvm/tools/opt/NewPMDriver.cpp
@@ -375,6 +375,9 @@
   PB.registerLoopAnalyses(LAM);
   PB.crossRegisterProxies(LAM, FAM, CGAM, MAM);
 
+  if (TM)
+    TM->registerPassBuilderCallbacks(PB, DebugPM);
+
   ModulePassManager MPM(DebugPM);
   if (VK > VK_NoVerifier)
     MPM.addPass(VerifierPass());