Reverts commit r368117, r368115 and r368112

This reverts commits:

  "Added Delta IR Reduction Tool"
  "[Bugpoint redesign] Added Pass to Remove Global Variables"
  "Added Tool as Dependency to tests & fixed warnings"

Reduce/remove-funcs.ll is failing on bots.

llvm-svn: 368122

13 files changed, 0 insertions, 746 deletions

diff --git a/llvm/tools/LLVMBuild.txt b/llvm/tools/LLVMBuild.txt
index b5c14b92edd..03a69754c08 100644
--- a/llvm/tools/LLVMBuild.txt
+++ b/llvm/tools/LLVMBuild.txt
@@ -48,7 +48,6 @@ subdirectories =
  llvm-pdbutil
  llvm-profdata
  llvm-rc
- llvm-reduce
  llvm-rtdyld
  llvm-size
  llvm-split
diff --git a/llvm/tools/llvm-reduce/CMakeLists.txt b/llvm/tools/llvm-reduce/CMakeLists.txt
deleted file mode 100644
index da58b6fc9ba..00000000000
--- a/llvm/tools/llvm-reduce/CMakeLists.txt
+++ /dev/null
@@ -1,25 +0,0 @@
-set(LLVM_LINK_COMPONENTS
-  AllTargetsAsmParsers
-  AllTargetsCodeGens
-  AllTargetsDescs
-  AllTargetsInfos
-  IRReader
-  Support
-  Target
-  TransformUtils
-  )
-
-# Support plugins.
-set(LLVM_NO_DEAD_STRIP 1)
-
-add_llvm_tool(llvm-reduce
-  llvm-reduce.cpp
-  TestRunner.cpp
-  deltas/Delta.cpp
-  deltas/RemoveFunctions.cpp
-  deltas/RemoveGlobalVars.cpp
-
-  DEPENDS
-  intrinsics_gen
-  )
-export_executable_symbols(llvm-reduce)
diff --git a/llvm/tools/llvm-reduce/DeltaManager.h b/llvm/tools/llvm-reduce/DeltaManager.h
deleted file mode 100644
index 5a8204de45b..00000000000
--- a/llvm/tools/llvm-reduce/DeltaManager.h
+++ /dev/null
@@ -1,30 +0,0 @@
-//===- DeltaManager.h - Runs Delta Passes to reduce Input -----------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file calls each specialized Delta pass in order to reduce the input IR
-// file.
-//
-//===----------------------------------------------------------------------===//
-
-#include "TestRunner.h"
-#include "deltas/Delta.h"
-#include "deltas/RemoveFunctions.h"
-#include "deltas/RemoveGlobalVars.h"
-
-namespace llvm {
-
-inline void runDeltaPasses(TestRunner &Tester) {
-  // TODO: Add option to only call certain delta passes
-  outs() << "Reducing functions...\n";
-  removeFunctionsDeltaPass(Tester);
-  outs() << "Reducing GVs...\n";
-  removeGlobalsDeltaPass(Tester);
-  // TODO: Implement the remaining Delta Passes
-}
-
-} // namespace llvm
diff --git a/llvm/tools/llvm-reduce/LLVMBuild.txt b/llvm/tools/llvm-reduce/LLVMBuild.txt
deleted file mode 100644
index 7928f050328..00000000000
--- a/llvm/tools/llvm-reduce/LLVMBuild.txt
+++ /dev/null
@@ -1,24 +0,0 @@
-;===- ./tools/llvm-reduce/LLVMBuild.txt ------------------------*- Conf -*--===;
-;
-; Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-; See https://llvm.org/LICENSE.txt for license information.
-; SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-;
-;===------------------------------------------------------------------------===;
-;
-; This is an LLVMBuild description file for the components in this subdirectory.
-;
-; For more information on the LLVMBuild system, please see:
-;
-;   http://llvm.org/docs/LLVMBuild.html
-;
-;===------------------------------------------------------------------------===;
-
-[component_0]
-type = Tool
-name = llvm-reduce
-parent = Tools
-required_libraries =
- BitReader
- IRReader
- all-targets
diff --git a/llvm/tools/llvm-reduce/TestRunner.cpp b/llvm/tools/llvm-reduce/TestRunner.cpp
deleted file mode 100644
index 59dc78418f8..00000000000
--- a/llvm/tools/llvm-reduce/TestRunner.cpp
+++ /dev/null
@@ -1,40 +0,0 @@
-//===-- TestRunner.cpp ----------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#include "TestRunner.h"
-
-using namespace llvm;
-
-TestRunner::TestRunner(StringRef TestName, std::vector<std::string> TestArgs,
-                       StringRef ReducedFilepath, SmallString<128> TmpDirectory)
-    : TestName(TestName), TestArgs(TestArgs), ReducedFilepath(ReducedFilepath),
-      TmpDirectory(TmpDirectory) {}
-
-/// Runs the interestingness test, passes file to be tested as first argument
-/// and other specified test arguments after that.
-int TestRunner::run(StringRef Filename) {
-  std::vector<StringRef> ProgramArgs;
-  ProgramArgs.push_back(TestName);
-  ProgramArgs.push_back(Filename);
-
-  for (unsigned I = 0, E = TestArgs.size(); I != E; ++I)
-    ProgramArgs.push_back(TestArgs[I].c_str());
-
-  StringRef SR = "";
-  Optional<StringRef> Redirects[3] = {SR, SR, SR}; // STDIN, STDOUT, STDERR
-  int Result = sys::ExecuteAndWait(TestName, ProgramArgs, None, Redirects);
-
-  if (Result < 0) {
-    Error E = make_error<StringError>("Error running interesting-ness test\n",
-                                      inconvertibleErrorCode());
-    outs() << toString(std::move(E));
-    exit(1);
-  }
-
-  return !Result;
-}
diff --git a/llvm/tools/llvm-reduce/TestRunner.h b/llvm/tools/llvm-reduce/TestRunner.h
deleted file mode 100644
index 8bfab9e3997..00000000000
--- a/llvm/tools/llvm-reduce/TestRunner.h
+++ /dev/null
@@ -1,52 +0,0 @@
-//===-- tools/llvm-reduce/TestRunner.h ---------------------------*- C++ -*-===/
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_TOOLS_LLVMREDUCE_TESTRUNNER_H
-#define LLVM_TOOLS_LLVMREDUCE_TESTRUNNER_H
-
-#include "llvm/ADT/SmallString.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Support/Error.h"
-#include "llvm/Support/Program.h"
-#include <vector>
-
-namespace llvm {
-
-// This class contains all the info necessary for running the provided
-// interesting-ness test, as well as the most reduced module and its
-// respective filename.
-class TestRunner {
-public:
-  TestRunner(StringRef TestName, std::vector<std::string> TestArgs,
-             StringRef ReducedFilepath, SmallString<128> TmpDirectory);
-
-  /// Runs the interesting-ness test for the specified file
-  /// @returns 0 if test was successful, 1 if otherwise
-  int run(StringRef Filename);
-
-  /// Filename to the most reduced testcase
-  StringRef getReducedFilepath() const { return ReducedFilepath; }
-  /// Directory where tmp files are created
-  StringRef getTmpDir() const { return TmpDirectory; }
-  /// Returns the most reduced version of the original testcase
-  Module *getProgram() const { return Program.get(); }
-
-  void setReducedFilepath(SmallString<128> F) { ReducedFilepath = F; }
-  void setProgram(std::unique_ptr<Module> P) { Program = std::move(P); }
-
-private:
-  SmallString<128> TestName;
-  std::vector<std::string> TestArgs;
-  SmallString<128> ReducedFilepath;
-  SmallString<128> TmpDirectory;
-  std::unique_ptr<Module> Program;
-};
-
-} // namespace llvm
-
-#endif
diff --git a/llvm/tools/llvm-reduce/deltas/Delta.cpp b/llvm/tools/llvm-reduce/deltas/Delta.cpp
deleted file mode 100644
index 2b0a2ddc84e..00000000000
--- a/llvm/tools/llvm-reduce/deltas/Delta.cpp
+++ /dev/null
@@ -1,171 +0,0 @@
-//===- Delta.cpp - Delta Debugging Algorithm Implementation ---------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file contains the implementation for the Delta Debugging Algorithm:
-// it splits a given set of Targets (i.e. Functions, Instructions, BBs, etc.)
-// into chunks and tries to reduce the number chunks that are interesting.
-//
-//===----------------------------------------------------------------------===//
-
-#include "Delta.h"
-
-/// Writes IR code to the given Filepath
-static bool writeProgramToFile(StringRef Filepath, int FD, const Module &M) {
-  ToolOutputFile Out(Filepath, FD);
-  M.print(Out.os(), /*AnnotationWriter=*/nullptr);
-  Out.os().close();
-
-  if (!Out.os().has_error()) {
-    Out.keep();
-    return false;
-  }
-  return true;
-}
-
-/// Creates a temporary (and unique) file inside the tmp folder and writes
-/// the given module IR.
-static SmallString<128> createTmpFile(Module *M, StringRef TmpDir) {
-  SmallString<128> UniqueFilepath;
-  int UniqueFD;
-
-  std::error_code EC = sys::fs::createUniqueFile(TmpDir + "/tmp-%%%.ll",
-                                                 UniqueFD, UniqueFilepath);
-  if (EC) {
-    errs() << "Error making unique filename: " << EC.message() << "!\n";
-    exit(1);
-  }
-
-  if (writeProgramToFile(UniqueFilepath, UniqueFD, *M)) {
-    errs() << "Error emitting bitcode to file '" << UniqueFilepath << "'!\n";
-    exit(1);
-  }
-  return UniqueFilepath;
-}
-
-/// Prints the Chunk Indexes with the following format: [start, end], if
-/// chunk is at minimum size (1), then it just displays [start].
-static void printChunks(std::vector<Chunk> Chunks, bool Oneline = false) {
-  for (auto C : Chunks) {
-    if (!Oneline)
-      outs() << '\t';
-    outs() << "[" << C.begin;
-    if (C.end - C.begin != 0)
-      outs() << "," << C.end;
-    outs() << "]";
-    if (!Oneline)
-      outs() << '\n';
-  }
-}
-
-/// Counts the amount of lines for a given file
-static unsigned getLines(StringRef Filepath) {
-  unsigned Lines = 0;
-  std::string CurrLine;
-  std::ifstream FileStream(Filepath);
-
-  while (std::getline(FileStream, CurrLine))
-    ++Lines;
-
-  return Lines;
-}
-
-/// Splits Chunks in half and prints them.
-/// If unable to split (when chunk size is 1) returns false.
-static bool increaseGranularity(std::vector<Chunk> &Chunks) {
-  outs() << "Increasing granularity...";
-  std::vector<Chunk> NewChunks;
-  bool SplitOne = false;
-
-  for (auto &C : Chunks) {
-    if (C.end - C.begin == 0)
-      NewChunks.push_back(C);
-    else {
-      unsigned Half = (C.begin + C.end) / 2;
-      NewChunks.push_back({C.begin, Half});
-      NewChunks.push_back({Half + 1, C.end});
-      SplitOne = true;
-    }
-  }
-  if (SplitOne) {
-    Chunks = NewChunks;
-    outs() << "Success! New Chunks:\n";
-    printChunks(Chunks);
-  }
-  return SplitOne;
-}
-
-void llvm::runDeltaPass(
-    TestRunner &Test, unsigned Targets,
-    std::function<std::unique_ptr<Module>(std::vector<Chunk>, Module *)>
-        ExtractChunksFromModule) {
-  if (!Targets)
-    return;
-
-  std::vector<Chunk> Chunks = {{1, Targets}};
-  std::set<Chunk> UninterestingChunks;
-  std::unique_ptr<Module> ReducedProgram;
-
-  if (!Test.run(Test.getReducedFilepath()) || !increaseGranularity(Chunks)) {
-    outs() << "\nCouldn't reduce\n";
-    outs() << "----------------------------\n";
-    return;
-  }
-
-  do {
-    UninterestingChunks = {};
-    for (int I = Chunks.size() - 1; I >= 0; --I) {
-      std::vector<Chunk> CurrentChunks;
-
-      for (auto C : Chunks)
-        if (!UninterestingChunks.count(C) && C != Chunks[I])
-          CurrentChunks.push_back(C);
-
-      if (CurrentChunks.empty())
-        break;
-
-      // Generate Module with only Targets inside Current Chunks
-      std::unique_ptr<Module> CurrentProgram =
-          ExtractChunksFromModule(CurrentChunks, Test.getProgram());
-      // Write Module to tmp file
-      SmallString<128> CurrentFilepath =
-          createTmpFile(CurrentProgram.get(), Test.getTmpDir());
-
-      outs() << "Testing with: ";
-      printChunks(CurrentChunks, /*Oneline=*/true);
-      outs() << " | " << sys::path::filename(CurrentFilepath);
-
-      // Current Chunks aren't interesting
-      if (!Test.run(CurrentFilepath)) {
-        outs() << "\n";
-        continue;
-      }
-      // We only care about interesting chunks if they reduce the testcase
-      if (getLines(CurrentFilepath) < getLines(Test.getReducedFilepath())) {
-        UninterestingChunks.insert(Chunks[I]);
-        Test.setReducedFilepath(CurrentFilepath);
-        ReducedProgram = std::move(CurrentProgram);
-        outs() << " **** SUCCESS | lines: " << getLines(CurrentFilepath);
-      }
-      outs() << "\n";
-    }
-    // Delete uninteresting chunks
-    auto UnwantedChunks = Chunks.end();
-    UnwantedChunks = std::remove_if(Chunks.begin(), Chunks.end(),
-                                    [UninterestingChunks](const Chunk &C) {
-                                      return UninterestingChunks.count(C);
-                                    });
-    Chunks.erase(UnwantedChunks, Chunks.end());
-
-  } while (!UninterestingChunks.empty() || increaseGranularity(Chunks));
-
-  // If we reduced the testcase replace it
-  if (ReducedProgram)
-    Test.setProgram(std::move(ReducedProgram));
-  outs() << "Couldn't increase anymore.\n";
-  outs() << "----------------------------\n";
-}
\ No newline at end of file
diff --git a/llvm/tools/llvm-reduce/deltas/Delta.h b/llvm/tools/llvm-reduce/deltas/Delta.h
deleted file mode 100644
index 3c807321967..00000000000
--- a/llvm/tools/llvm-reduce/deltas/Delta.h
+++ /dev/null
@@ -1,75 +0,0 @@
-//===- Delta.h - Delta Debugging Algorithm Implementation -----------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file contains the implementation for the Delta Debugging Algorithm:
-// it splits a given set of Targets (i.e. Functions, Instructions, BBs, etc.)
-// into chunks and tries to reduce the number chunks that are interesting.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_TOOLS_LLVMREDUCE_LLVMREDUCE_DELTA_H
-#define LLVM_TOOLS_LLVMREDUCE_LLVMREDUCE_DELTA_H
-
-#include "../TestRunner.h"
-#include "llvm/IR/Verifier.h"
-#include "llvm/Support/FileSystem.h"
-#include "llvm/Support/Path.h"
-#include "llvm/Support/ScopedPrinter.h"
-#include "llvm/Support/ToolOutputFile.h"
-#include <fstream>
-#include <set>
-#include <vector>
-
-using namespace llvm;
-
-struct Chunk {
-  unsigned begin;
-  unsigned end;
-
-  /// Operator when populating CurrentChunks in Generic Delta Pass
-  friend bool operator!=(const Chunk &C1, const Chunk &C2) {
-    return C1.begin != C2.begin && C1.end != C2.end;
-  }
-
-  /// Operator used for sets
-  friend bool operator<(const Chunk &C1, const Chunk &C2) {
-    return C1.begin < C2.begin;
-  }
-};
-
-namespace llvm {
-
-/// This function implements the Delta Debugging algorithm, it receives a
-/// number of Targets (e.g. Functions, Instructions, Basic Blocks, etc.) and
-/// splits them in half; these chunks of targets are then tested while ignoring
-/// one chunk, if a chunk is proven to be uninteresting (i.e. fails the test)
-/// it is removed from consideration. The algorithm will attempt to split the
-/// Chunks in half and start the process again until it can't split chunks
-/// anymore.
-///
-/// This function is intended to be called by each specialized delta pass (e.g.
-/// RemoveFunctions) and receives three key parameters:
-/// * Test: The main TestRunner instance which is used to run the provided
-/// interesting-ness test, as well as to store and access the reduced Program.
-/// * Targets: The amount of Targets that are going to be reduced by the
-/// algorithm, for example, the RemoveGlobalVars pass would send the amount of
-/// initialized GVs.
-/// * ExtractChunksFromModule: A function used to tailor the main program so it
-/// only contains Targets that are inside Chunks of the given iteration.
-/// Note: This function is implemented by each specialized Delta pass
-///
-/// Other implementations of the Delta Debugging algorithm can also be found in
-/// the CReduce, Delta, and Lithium projects.
-void runDeltaPass(
-    TestRunner &Test, unsigned Targets,
-    std::function<std::unique_ptr<Module>(std::vector<Chunk>, Module *)>
-        ExtractChunksFromModule);
-
-} // namespace llvm
-
-#endif
diff --git a/llvm/tools/llvm-reduce/deltas/RemoveFunctions.cpp b/llvm/tools/llvm-reduce/deltas/RemoveFunctions.cpp
deleted file mode 100644
index bed8e2b792f..00000000000
--- a/llvm/tools/llvm-reduce/deltas/RemoveFunctions.cpp
+++ /dev/null
@@ -1,86 +0,0 @@
-//===- RemoveFunctions.cpp - Specialized Delta Pass -----------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements a function which calls the Generic Delta pass in order
-// to reduce functions (and any instruction that calls it) in the provided
-// Module.
-//
-//===----------------------------------------------------------------------===//
-
-#include "RemoveFunctions.h"
-
-/// Removes all the Defined Functions (as well as their calls)
-/// that aren't inside any of the desired Chunks.
-/// @returns the Module stripped of out-of-chunk functions
-static std::unique_ptr<Module>
-extractFunctionsFromModule(std::vector<Chunk> ChunksToKeep, Module *Program) {
-  std::unique_ptr<Module> Clone = CloneModule(*Program);
-
-  // Get functions inside desired chunks
-  std::set<Function *> FuncsToKeep;
-  unsigned I = 0, FunctionCount = 1;
-  for (auto &F : *Clone) {
-    if (!F.isDeclaration() && I < ChunksToKeep.size()) {
-      if (FunctionCount >= ChunksToKeep[I].begin &&
-          FunctionCount <= ChunksToKeep[I].end)
-        FuncsToKeep.insert(&F);
-      if (FunctionCount == ChunksToKeep[I].end)
-        ++I;
-      ++FunctionCount;
-    }
-  }
-
-  // Delete out-of-chunk functions, and replace their calls with undef
-  std::vector<Function *> FuncsToRemove;
-  for (auto &F : *Clone) {
-    if (!F.isDeclaration() && !FuncsToKeep.count(&F)) {
-      F.replaceAllUsesWith(UndefValue::get(F.getType()));
-      FuncsToRemove.push_back(&F);
-    }
-  }
-  for (auto *F : FuncsToRemove)
-    F->eraseFromParent();
-
-  // Delete instructions with undef calls
-  std::vector<Instruction *> InstToRemove;
-  for (auto &F : *Clone)
-    for (auto &BB : F)
-      for (auto &I : BB)
-        if (auto *Call = dyn_cast<CallInst>(&I))
-          if (!Call->getCalledFunction()) {
-            // Instruction might be stored / used somewhere else
-            I.replaceAllUsesWith(UndefValue::get(I.getType()));
-            InstToRemove.push_back(&I);
-          }
-
-  for (auto *I : InstToRemove)
-    I->eraseFromParent();
-
-  return Clone;
-}
-
-/// Counts the amount of non-declaration functions and prints their
-/// respective name & index
-static int countFunctions(Module *Program) {
-  // TODO: Silence index with --quiet flag
-  outs() << "----------------------------\n";
-  outs() << "Function Index Reference:\n";
-  int FunctionCount = 0;
-  for (auto &F : *Program)
-    if (!F.isDeclaration()) {
-      ++FunctionCount;
-      outs() << "\t" << FunctionCount << ": " << F.getName() << "\n";
-    }
-  outs() << "----------------------------\n";
-  return FunctionCount;
-}
-
-void llvm::removeFunctionsDeltaPass(TestRunner &Test) {
-  int FunctionCount = countFunctions(Test.getProgram());
-  runDeltaPass(Test, FunctionCount, extractFunctionsFromModule);
-}
\ No newline at end of file
diff --git a/llvm/tools/llvm-reduce/deltas/RemoveFunctions.h b/llvm/tools/llvm-reduce/deltas/RemoveFunctions.h
deleted file mode 100644
index ca7b55c982f..00000000000
--- a/llvm/tools/llvm-reduce/deltas/RemoveFunctions.h
+++ /dev/null
@@ -1,20 +0,0 @@
-//===- RemoveFunctions.h - Specialized Delta Pass -------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements a function which calls the Generic Delta pass in order
-// to reduce functions (and any instruction that calls it) in the provided
-// Module.
-//
-//===----------------------------------------------------------------------===//
-
-#include "Delta.h"
-#include "llvm/Transforms/Utils/Cloning.h"
-
-namespace llvm {
-void removeFunctionsDeltaPass(TestRunner &Test);
-} // namespace llvm
diff --git a/llvm/tools/llvm-reduce/deltas/RemoveGlobalVars.cpp b/llvm/tools/llvm-reduce/deltas/RemoveGlobalVars.cpp
deleted file mode 100644
index cd169073992..00000000000
--- a/llvm/tools/llvm-reduce/deltas/RemoveGlobalVars.cpp
+++ /dev/null
@@ -1,79 +0,0 @@
-//===- RemoveGlobalVars.cpp - Specialized Delta Pass ----------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements a function which calls the Generic Delta pass in order
-// to reduce initialized Global Variables in the provided Module.
-//
-//===----------------------------------------------------------------------===//
-
-#include "RemoveGlobalVars.h"
-
-/// Removes all the Initialized GVs that aren't inside the desired Chunks.
-/// @returns the Module stripped of out-of-chunk GVs
-static std::unique_ptr<Module>
-extractGVsFromModule(std::vector<Chunk> ChunksToKeep, Module *Program) {
-  std::unique_ptr<Module> Clone = CloneModule(*Program);
-
-  // Get GVs inside desired chunks
-  std::set<GlobalVariable *> GVsToKeep;
-  unsigned I = 0, GVCount = 1;
-  for (auto &GV : Clone->globals()) {
-    if (GV.hasInitializer() && I < ChunksToKeep.size()) {
-      if (GVCount >= ChunksToKeep[I].begin && GVCount <= ChunksToKeep[I].end)
-        GVsToKeep.insert(&GV);
-      if (GVCount == ChunksToKeep[I].end)
-        ++I;
-      ++GVCount;
-    }
-  }
-
-  // Replace out-of-chunk GV uses with undef
-  std::vector<GlobalVariable *> ToRemove;
-  std::vector<Instruction *> InstToRemove;
-  for (auto &GV : Clone->globals())
-    if (GV.hasInitializer() && !GVsToKeep.count(&GV)) {
-      for (auto U : GV.users())
-        if (auto *Inst = dyn_cast<Instruction>(U))
-          InstToRemove.push_back(Inst);
-
-      GV.replaceAllUsesWith(UndefValue::get(GV.getType()));
-      ToRemove.push_back(&GV);
-    }
-
-  // Delete Instruction uses of unwanted GVs
-  for (auto *Inst : InstToRemove) {
-    Inst->replaceAllUsesWith(UndefValue::get(Inst->getType()));
-    Inst->eraseFromParent();
-  }
-
-  for (auto *GV : ToRemove)
-    GV->eraseFromParent();
-
-  return Clone;
-}
-
-/// Counts the amount of initialized GVs and displays their
-/// respective name & index
-static int countGVs(Module *Program) {
-  // TODO: Silence index with --quiet flag
-  outs() << "----------------------------\n";
-  outs() << "GlobalVariable Index Reference:\n";
-  int GVCount = 0;
-  for (auto &GV : Program->globals())
-    if (GV.hasInitializer()) {
-      ++GVCount;
-      outs() << "\t" << GVCount << ": " << GV.getName() << "\n";
-    }
-  outs() << "----------------------------\n";
-  return GVCount;
-}
-
-void llvm::removeGlobalsDeltaPass(TestRunner &Test) {
-  int GVCount = countGVs(Test.getProgram());
-  runDeltaPass(Test, GVCount, extractGVsFromModule);
-}
diff --git a/llvm/tools/llvm-reduce/deltas/RemoveGlobalVars.h b/llvm/tools/llvm-reduce/deltas/RemoveGlobalVars.h
deleted file mode 100644
index b53f4e78d4c..00000000000
--- a/llvm/tools/llvm-reduce/deltas/RemoveGlobalVars.h
+++ /dev/null
@@ -1,20 +0,0 @@
-//===- RemoveGlobalVars.h - Specialized Delta Pass ------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements a function which calls the Generic Delta pass in order
-// to reduce initialized Global Variables in the provided Module.
-//
-//===----------------------------------------------------------------------===//
-
-#include "Delta.h"
-#include "llvm/IR/Value.h"
-#include "llvm/Transforms/Utils/Cloning.h"
-
-namespace llvm {
-void removeGlobalsDeltaPass(TestRunner &Test);
-} // namespace llvm
diff --git a/llvm/tools/llvm-reduce/llvm-reduce.cpp b/llvm/tools/llvm-reduce/llvm-reduce.cpp
deleted file mode 100644
index d7da0d88eea..00000000000
--- a/llvm/tools/llvm-reduce/llvm-reduce.cpp
+++ /dev/null
@@ -1,123 +0,0 @@
-//===- llvm-reduce.cpp - The LLVM Delta Reduction utility -----------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This program tries to reduce an IR test case for a given interesting-ness
-// test. It runs multiple delta debugging passes in order to minimize the input
-// file. It's worth noting that this is a part of the bugpoint redesign
-// proposal, and thus a *temporary* tool that will eventually be integrated
-// into the bugpoint tool itself.
-//
-//===----------------------------------------------------------------------===//
-
-#include "DeltaManager.h"
-#include "llvm/ADT/SmallString.h"
-#include "llvm/IR/LLVMContext.h"
-#include "llvm/IR/Verifier.h"
-#include "llvm/IRReader/IRReader.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/InitLLVM.h"
-#include "llvm/Support/SourceMgr.h"
-#include "llvm/Support/raw_ostream.h"
-#include <system_error>
-#include <vector>
-
-using namespace llvm;
-
-static cl::opt<bool> Help("h", cl::desc("Alias for -help"), cl::Hidden);
-static cl::opt<bool> Version("v", cl::desc("Alias for -version"), cl::Hidden);
-
-static cl::opt<std::string> InputFilename(cl::Positional, cl::Required,
-                                          cl::desc("<input llvm ll/bc file>"));
-
-static cl::opt<std::string>
-    TestFilename("test", cl::Required,
-                 cl::desc("Name of the interesting-ness test to be run"));
-
-static cl::list<std::string>
-    TestArguments("test-arg", cl::ZeroOrMore,
-                  cl::desc("Arguments passed onto the interesting-ness test"));
-
-static cl::opt<std::string>
-    OutputFilename("output",
-                   cl::desc("Specify the output file. default: reduced.ll"));
-static cl::alias OutputFileAlias("o", cl::desc("Alias for -output"),
-                                 cl::aliasopt(OutputFilename));
-
-static cl::opt<bool>
-    ReplaceInput("in-place",
-                 cl::desc("WARNING: This option will replace your input file"
-                          "with the reduced version!"));
-
-// Parses IR into a Module and verifies it
-static std::unique_ptr<Module> parseInputFile(StringRef Filename,
-                                              LLVMContext &Ctxt) {
-  SMDiagnostic Err;
-  std::unique_ptr<Module> Result = parseIRFile(Filename, Err, Ctxt);
-  if (!Result) {
-    Err.print("llvm-reduce", errs());
-    return Result;
-  }
-
-  if (verifyModule(*Result, &errs())) {
-    errs() << "Error: " << Filename << " - input module is broken!\n";
-    return std::unique_ptr<Module>();
-  }
-
-  return Result;
-}
-
-/// Gets Current Working Directory and tries to create a Tmp Directory
-static SmallString<128> initializeTmpDirectory() {
-  SmallString<128> CWD;
-  if (std::error_code EC = sys::fs::current_path(CWD)) {
-    errs() << "Error getting current directory: " << EC.message() << "!\n";
-    exit(1);
-  }
-
-  SmallString<128> TmpDirectory;
-  sys::path::append(TmpDirectory, CWD, "tmp");
-  if (std::error_code EC = sys::fs::create_directory(TmpDirectory))
-    errs() << "Error creating tmp directory: " << EC.message() << "!\n";
-
-  return TmpDirectory;
-}
-
-int main(int argc, char **argv) {
-  InitLLVM X(argc, argv);
-
-  cl::ParseCommandLineOptions(argc, argv, "LLVM automatic testcase reducer.\n");
-
-  LLVMContext Context;
-  std::unique_ptr<Module> OriginalProgram =
-      parseInputFile(InputFilename, Context);
-
-  // Initialize test environment
-  SmallString<128> TmpDirectory = initializeTmpDirectory();
-  TestRunner Tester(TestFilename, TestArguments, InputFilename, TmpDirectory);
-  Tester.setProgram(std::move(OriginalProgram));
-
-  // Try to reduce code
-  runDeltaPasses(Tester);
-  StringRef ReducedFilename = sys::path::filename(Tester.getReducedFilepath());
-
-  if (ReducedFilename == InputFilename) {
-    outs() << "\nCouldnt reduce input :/\n";
-  } else {
-    if (ReplaceInput) // In-place
-      OutputFilename = InputFilename.c_str();
-    else if (OutputFilename.empty())
-      OutputFilename = "reduced.ll";
-    else
-      OutputFilename += ".ll";
-
-    sys::fs::copy_file(Tester.getReducedFilepath(), OutputFilename);
-    outs() << "\nDone reducing! Reduced IR to file: " << OutputFilename << "\n";
-  }
-
-  return 0;
-}