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);
+
   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 +294,10 @@
   /// 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 &) {}
+
   /// 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 +37,7 @@
   static unsigned getModuleMatchQuality(const Module &M);
 
   void adjustPassManager(PassManagerBuilder &PMB) override;
+  void registerPassBuilderCallbacks(PassBuilder &PB) 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 +274,17 @@
       });
 }
 
+void HexagonTargetMachine::registerPassBuilderCallbacks(PassBuilder &PB) {
+  PB.registerOptimizerLastEPCallback(
+      [](ModulePassManager &MPM, PassBuilder::OptimizationLevel Level) {
+        LoopPassManager LPM(false);
+        FunctionPassManager FPM(false);
+        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/CodeGen/Hexagon/registerpassbuildercallbacks.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/Hexagon/registerpassbuildercallbacks.ll
@@ -0,0 +1,31 @@
+; RUN: opt -passes='default<O1>' -mtriple=hexagon -disable-output -disable-verify -debug-pass-manager %s 2>&1 | FileCheck -check-prefix=NPM-O1 %s
+; REQUIRES: asserts
+; NPM-O1: Running pass: HexagonVectorLoopCarriedReusePass on Loop at depth 1 containing: %for.body<header><latch><exiting>
+
+; Function Attrs: noinline nounwind optnone
+define dso_local void @foo() {
+entry:
+  %i = alloca i32, align 4
+  store i32 0, i32* %i, align 4
+  br label %for.cond
+
+for.cond:                                         ; preds = %for.inc, %entry
+  %0 = load i32, i32* %i, align 4
+  %cmp = icmp slt i32 %0, 1000
+  br i1 %cmp, label %for.body, label %for.end
+
+for.body:                                         ; preds = %for.cond
+  call void bitcast (void (...)* @bar to void ()*)()
+  br label %for.inc
+
+for.inc:                                          ; preds = %for.body
+  %1 = load i32, i32* %i, align 4
+  %inc = add nsw i32 %1, 1
+  store i32 %inc, i32* %i, align 4
+  br label %for.cond
+
+for.end:                                          ; preds = %for.cond
+  ret void
+}
+
+declare dso_local void @bar(...)
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);
+
   ModulePassManager MPM(DebugPM);
   if (VK > VK_NoVerifier)
     MPM.addPass(VerifierPass());