Index: llvm/include/llvm/Passes/PassBuilder.h
===================================================================
--- llvm/include/llvm/Passes/PassBuilder.h
+++ llvm/include/llvm/Passes/PassBuilder.h
@@ -477,6 +477,24 @@
     OptimizerLastEPCallbacks.push_back(C);
   }
 
+  /// Register a callback for a default optimizer pipeline extension point
+  ///
+  /// This extension point allows adding optimizations at the start of the full
+  /// LTO pipeline.
+  void registerFullLinkTimeOptimizationEarlyEPCallback(
+      const std::function<void(ModulePassManager &, OptimizationLevel)> &C) {
+    FullLinkTimeOptimizationEarlyEPCallbacks.push_back(C);
+  }
+
+  /// Register a callback for a default optimizer pipeline extension point
+  ///
+  /// This extension point allows adding optimizations at the end of the full
+  /// LTO pipeline.
+  void registerFullLinkTimeOptimizationLastEPCallback(
+      const std::function<void(ModulePassManager &, OptimizationLevel)> &C) {
+    FullLinkTimeOptimizationLastEPCallbacks.push_back(C);
+  }
+
   /// Register a callback for parsing an AliasAnalysis Name to populate
   /// the given AAManager \p AA
   void registerParseAACallback(
@@ -600,6 +618,10 @@
       VectorizerStartEPCallbacks;
   SmallVector<std::function<void(ModulePassManager &, OptimizationLevel)>, 2>
       OptimizerLastEPCallbacks;
+  SmallVector<std::function<void(ModulePassManager &, OptimizationLevel)>, 2>
+      FullLinkTimeOptimizationEarlyEPCallbacks;
+  SmallVector<std::function<void(ModulePassManager &, OptimizationLevel)>, 2>
+      FullLinkTimeOptimizationLastEPCallbacks;
   // Module callbacks
   SmallVector<std::function<void(ModulePassManager &, OptimizationLevel)>, 2>
       PipelineStartEPCallbacks;
Index: llvm/lib/Passes/PassBuilderPipelines.cpp
===================================================================
--- llvm/lib/Passes/PassBuilderPipelines.cpp
+++ llvm/lib/Passes/PassBuilderPipelines.cpp
@@ -1450,6 +1450,9 @@
                                      ModuleSummaryIndex *ExportSummary) {
   ModulePassManager MPM;
 
+  for (auto &C : FullLinkTimeOptimizationEarlyEPCallbacks)
+    C(MPM, Level);
+
   // Convert @llvm.global.annotations to !annotation metadata.
   MPM.addPass(Annotation2MetadataPass());
 
@@ -1466,6 +1469,9 @@
     // in ICP.
     MPM.addPass(LowerTypeTestsPass(nullptr, nullptr, true));
 
+    for (auto &C : FullLinkTimeOptimizationLastEPCallbacks)
+      C(MPM, Level);
+
     // Emit annotation remarks.
     addAnnotationRemarksPass(MPM);
 
@@ -1547,6 +1553,9 @@
     // pipeline).
     MPM.addPass(LowerTypeTestsPass(nullptr, nullptr, true));
 
+    for (auto &C : FullLinkTimeOptimizationLastEPCallbacks)
+      C(MPM, Level);
+
     // Emit annotation remarks.
     addAnnotationRemarksPass(MPM);
 
@@ -1718,6 +1727,9 @@
   if (PTO.MergeFunctions)
     MPM.addPass(MergeFunctionsPass());
 
+  for (auto &C : FullLinkTimeOptimizationLastEPCallbacks)
+    C(MPM, Level);
+
   // Emit annotation remarks.
   addAnnotationRemarksPass(MPM);
 
Index: llvm/test/Other/new-pm-ep-callbacks.ll
===================================================================
--- llvm/test/Other/new-pm-ep-callbacks.ll
+++ llvm/test/Other/new-pm-ep-callbacks.ll
@@ -6,6 +6,12 @@
 ; RUN: opt -disable-output -debug-pass-manager -passes-ep-pipeline-start=no-op-module -passes='default<O0>' 2>&1 < %s | FileCheck %s
 ; RUN: opt -disable-output -debug-pass-manager -passes-ep-pipeline-early-simplification=no-op-module -passes='default<O0>' 2>&1 < %s | FileCheck %s
 ; RUN: opt -disable-output -debug-pass-manager -passes-ep-optimizer-last=no-op-function -passes='default<O0>' 2>&1 < %s | FileCheck %s
+; RUN: opt -disable-output -debug-pass-manager -passes-ep-full-link-time-optimization-early=no-op-function -passes='lto<O0>' 2>&1 < %s | FileCheck %s
+; RUN: opt -disable-output -debug-pass-manager -passes-ep-full-link-time-optimization-last=no-op-function -passes='lto<O0>' 2>&1 < %s | FileCheck %s
+; RUN: opt -disable-output -debug-pass-manager -passes-ep-full-link-time-optimization-early=no-op-function -passes='lto<O1>' 2>&1 < %s | FileCheck %s
+; RUN: opt -disable-output -debug-pass-manager -passes-ep-full-link-time-optimization-last=no-op-function -passes='lto<O1>' 2>&1 < %s | FileCheck %s
+; RUN: opt -disable-output -debug-pass-manager -passes-ep-full-link-time-optimization-early=no-op-function -passes='lto<O2>' 2>&1 < %s | FileCheck %s
+; RUN: opt -disable-output -debug-pass-manager -passes-ep-full-link-time-optimization-last=no-op-function -passes='lto<O2>' 2>&1 < %s | FileCheck %s
 
 ; CHECK: Running pass: NoOp
 
Index: llvm/tools/opt/NewPMDriver.cpp
===================================================================
--- llvm/tools/opt/NewPMDriver.cpp
+++ llvm/tools/opt/NewPMDriver.cpp
@@ -127,6 +127,18 @@
     cl::desc("A textual description of the module pass pipeline inserted at "
              "the OptimizerLast extension point into default pipelines"),
     cl::Hidden);
+static cl::opt<std::string> FullLinkTimeOptimizationEarlyEPPipeline(
+    "passes-ep-full-link-time-optimization-early",
+    cl::desc("A textual description of the module pass pipeline inserted at "
+             "the FullLinkTimeOptimizationEarly extension point into default "
+             "pipelines"),
+    cl::Hidden);
+static cl::opt<std::string> FullLinkTimeOptimizationLastEPPipeline(
+    "passes-ep-full-link-time-optimization-last",
+    cl::desc("A textual description of the module pass pipeline inserted at "
+             "the FullLinkTimeOptimizationLast extension point into default "
+             "pipelines"),
+    cl::Hidden);
 
 // Individual pipeline tuning options.
 extern cl::opt<bool> DisableLoopUnrolling;
@@ -229,6 +241,23 @@
           ExitOnError Err("Unable to parse OptimizerLastEP pipeline: ");
           Err(PB.parsePassPipeline(PM, OptimizerLastEPPipeline));
         });
+  if (tryParsePipelineText<FunctionPassManager>(
+          PB, FullLinkTimeOptimizationEarlyEPPipeline))
+    PB.registerFullLinkTimeOptimizationEarlyEPCallback(
+        [&PB](ModulePassManager &PM, OptimizationLevel) {
+          ExitOnError Err(
+              "Unable to parse FullLinkTimeOptimizationEarlyEP pipeline: ");
+          Err(PB.parsePassPipeline(PM,
+                                   FullLinkTimeOptimizationEarlyEPPipeline));
+        });
+  if (tryParsePipelineText<FunctionPassManager>(
+          PB, FullLinkTimeOptimizationLastEPPipeline))
+    PB.registerFullLinkTimeOptimizationLastEPCallback(
+        [&PB](ModulePassManager &PM, OptimizationLevel) {
+          ExitOnError Err(
+              "Unable to parse FullLinkTimeOptimizationLastEP pipeline: ");
+          Err(PB.parsePassPipeline(PM, FullLinkTimeOptimizationLastEPPipeline));
+        });
 }
 
 #define HANDLE_EXTENSION(Ext)                                                  \