1 files changed, 0 insertions, 165 deletions
diff --git a/contrib/llvm/lib/Transforms/IPO/LoopExtractor.cpp b/contrib/llvm/lib/Transforms/IPO/LoopExtractor.cpp
deleted file mode 100644
index 91c7b5f5f135..000000000000
--- a/contrib/llvm/lib/Transforms/IPO/LoopExtractor.cpp
+++ /dev/null
@@ -1,165 +0,0 @@
-//===- LoopExtractor.cpp - Extract each loop into a new function ----------===//
-//
-// 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
-//
-//===----------------------------------------------------------------------===//
-//
-// A pass wrapper around the ExtractLoop() scalar transformation to extract each
-// top-level loop into its own new function. If the loop is the ONLY loop in a
-// given function, it is not touched. This is a pass most useful for debugging
-// via bugpoint.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/ADT/Statistic.h"
-#include "llvm/Analysis/AssumptionCache.h"
-#include "llvm/Analysis/LoopPass.h"
-#include "llvm/IR/Dominators.h"
-#include "llvm/IR/Instructions.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Pass.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Transforms/IPO.h"
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/Transforms/Utils.h"
-#include "llvm/Transforms/Utils/BasicBlockUtils.h"
-#include "llvm/Transforms/Utils/CodeExtractor.h"
-#include <fstream>
-#include <set>
-using namespace llvm;
-
-#define DEBUG_TYPE "loop-extract"
-
-STATISTIC(NumExtracted, "Number of loops extracted");
-
-namespace {
-  struct LoopExtractor : public LoopPass {
-    static char ID; // Pass identification, replacement for typeid
-    unsigned NumLoops;
-
-    explicit LoopExtractor(unsigned numLoops = ~0)
-      : LoopPass(ID), NumLoops(numLoops) {
-        initializeLoopExtractorPass(*PassRegistry::getPassRegistry());
-      }
-
-    bool runOnLoop(Loop *L, LPPassManager &) override;
-
-    void getAnalysisUsage(AnalysisUsage &AU) const override {
-      AU.addRequiredID(BreakCriticalEdgesID);
-      AU.addRequiredID(LoopSimplifyID);
-      AU.addRequired<DominatorTreeWrapperPass>();
-      AU.addRequired<LoopInfoWrapperPass>();
-      AU.addUsedIfAvailable<AssumptionCacheTracker>();
-    }
-  };
-}
-
-char LoopExtractor::ID = 0;
-INITIALIZE_PASS_BEGIN(LoopExtractor, "loop-extract",
-                      "Extract loops into new functions", false, false)
-INITIALIZE_PASS_DEPENDENCY(BreakCriticalEdges)
-INITIALIZE_PASS_DEPENDENCY(LoopSimplify)
-INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
-INITIALIZE_PASS_END(LoopExtractor, "loop-extract",
-                    "Extract loops into new functions", false, false)
-
-namespace {
-  /// SingleLoopExtractor - For bugpoint.
-  struct SingleLoopExtractor : public LoopExtractor {
-    static char ID; // Pass identification, replacement for typeid
-    SingleLoopExtractor() : LoopExtractor(1) {}
-  };
-} // End anonymous namespace
-
-char SingleLoopExtractor::ID = 0;
-INITIALIZE_PASS(SingleLoopExtractor, "loop-extract-single",
-                "Extract at most one loop into a new function", false, false)
-
-// createLoopExtractorPass - This pass extracts all natural loops from the
-// program into a function if it can.
-//
-Pass *llvm::createLoopExtractorPass() { return new LoopExtractor(); }
-
-bool LoopExtractor::runOnLoop(Loop *L, LPPassManager &LPM) {
-  if (skipLoop(L))
-    return false;
-
-  // Only visit top-level loops.
-  if (L->getParentLoop())
-    return false;
-
-  // If LoopSimplify form is not available, stay out of trouble.
-  if (!L->isLoopSimplifyForm())
-    return false;
-
-  DominatorTree &DT = getAnalysis<DominatorTreeWrapperPass>().getDomTree();
-  LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
-  bool Changed = false;
-
-  // If there is more than one top-level loop in this function, extract all of
-  // the loops. Otherwise there is exactly one top-level loop; in this case if
-  // this function is more than a minimal wrapper around the loop, extract
-  // the loop.
-  bool ShouldExtractLoop = false;
-
-  // Extract the loop if the entry block doesn't branch to the loop header.
-  Instruction *EntryTI =
-      L->getHeader()->getParent()->getEntryBlock().getTerminator();
-  if (!isa<BranchInst>(EntryTI) ||
-      !cast<BranchInst>(EntryTI)->isUnconditional() ||
-      EntryTI->getSuccessor(0) != L->getHeader()) {
-    ShouldExtractLoop = true;
-  } else {
-    // Check to see if any exits from the loop are more than just return
-    // blocks.
-    SmallVector<BasicBlock*, 8> ExitBlocks;
-    L->getExitBlocks(ExitBlocks);
-    for (unsigned i = 0, e = ExitBlocks.size(); i != e; ++i)
-      if (!isa<ReturnInst>(ExitBlocks[i]->getTerminator())) {
-        ShouldExtractLoop = true;
-        break;
-      }
-  }
-
-  if (ShouldExtractLoop) {
-    // We must omit EH pads. EH pads must accompany the invoke
-    // instruction. But this would result in a loop in the extracted
-    // function. An infinite cycle occurs when it tries to extract that loop as
-    // well.
-    SmallVector<BasicBlock*, 8> ExitBlocks;
-    L->getExitBlocks(ExitBlocks);
-    for (unsigned i = 0, e = ExitBlocks.size(); i != e; ++i)
-      if (ExitBlocks[i]->isEHPad()) {
-        ShouldExtractLoop = false;
-        break;
-      }
-  }
-
-  if (ShouldExtractLoop) {
-    if (NumLoops == 0) return Changed;
-    --NumLoops;
-    AssumptionCache *AC = nullptr;
-    if (auto *ACT = getAnalysisIfAvailable<AssumptionCacheTracker>())
-      AC = ACT->lookupAssumptionCache(*L->getHeader()->getParent());
-    CodeExtractor Extractor(DT, *L, false, nullptr, nullptr, AC);
-    if (Extractor.extractCodeRegion() != nullptr) {
-      Changed = true;
-      // After extraction, the loop is replaced by a function call, so
-      // we shouldn't try to run any more loop passes on it.
-      LPM.markLoopAsDeleted(*L);
-      LI.erase(L);
-    }
-    ++NumExtracted;
-  }
-
-  return Changed;
-}
-
-// createSingleLoopExtractorPass - This pass extracts one natural loop from the
-// program into a function if it can.  This is used by bugpoint.
-//
-Pass *llvm::createSingleLoopExtractorPass() {
-  return new SingleLoopExtractor();
-}