1 files changed, 0 insertions, 614 deletions

diff --git a/contrib/llvm/lib/Target/AMDGPU/GCNIterativeScheduler.cpp b/contrib/llvm/lib/Target/AMDGPU/GCNIterativeScheduler.cpp
deleted file mode 100644
index 3525174223bd..000000000000
--- a/contrib/llvm/lib/Target/AMDGPU/GCNIterativeScheduler.cpp
+++ /dev/null
@@ -1,614 +0,0 @@
-//===- GCNIterativeScheduler.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 "GCNIterativeScheduler.h"
-#include "AMDGPUSubtarget.h"
-#include "GCNRegPressure.h"
-#include "GCNSchedStrategy.h"
-#include "SIMachineFunctionInfo.h"
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/CodeGen/LiveIntervals.h"
-#include "llvm/CodeGen/MachineBasicBlock.h"
-#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/RegisterPressure.h"
-#include "llvm/CodeGen/ScheduleDAG.h"
-#include "llvm/Config/llvm-config.h"
-#include "llvm/Support/Compiler.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/raw_ostream.h"
-#include <algorithm>
-#include <cassert>
-#include <iterator>
-#include <limits>
-#include <memory>
-#include <type_traits>
-#include <vector>
-
-using namespace llvm;
-
-#define DEBUG_TYPE "machine-scheduler"
-
-namespace llvm {
-
-std::vector<const SUnit *> makeMinRegSchedule(ArrayRef<const SUnit *> TopRoots,
-                                              const ScheduleDAG &DAG);
-
-  std::vector<const SUnit*> makeGCNILPScheduler(ArrayRef<const SUnit*> BotRoots,
-    const ScheduleDAG &DAG);
-}
-
-// shim accessors for different order containers
-static inline MachineInstr *getMachineInstr(MachineInstr *MI) {
-  return MI;
-}
-static inline MachineInstr *getMachineInstr(const SUnit *SU) {
-  return SU->getInstr();
-}
-static inline MachineInstr *getMachineInstr(const SUnit &SU) {
-  return SU.getInstr();
-}
-
-#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
-LLVM_DUMP_METHOD
-static void printRegion(raw_ostream &OS,
-                        MachineBasicBlock::iterator Begin,
-                        MachineBasicBlock::iterator End,
-                        const LiveIntervals *LIS,
-                        unsigned MaxInstNum =
-                          std::numeric_limits<unsigned>::max()) {
-  auto BB = Begin->getParent();
-  OS << BB->getParent()->getName() << ":" << printMBBReference(*BB) << ' '
-     << BB->getName() << ":\n";
-  auto I = Begin;
-  MaxInstNum = std::max(MaxInstNum, 1u);
-  for (; I != End && MaxInstNum; ++I, --MaxInstNum) {
-    if (!I->isDebugInstr() && LIS)
-      OS << LIS->getInstructionIndex(*I);
-    OS << '\t' << *I;
-  }
-  if (I != End) {
-    OS << "\t...\n";
-    I = std::prev(End);
-    if (!I->isDebugInstr() && LIS)
-      OS << LIS->getInstructionIndex(*I);
-    OS << '\t' << *I;
-  }
-  if (End != BB->end()) { // print boundary inst if present
-    OS << "----\n";
-    if (LIS) OS << LIS->getInstructionIndex(*End) << '\t';
-    OS << *End;
-  }
-}
-
-LLVM_DUMP_METHOD
-static void printLivenessInfo(raw_ostream &OS,
-                              MachineBasicBlock::iterator Begin,
-                              MachineBasicBlock::iterator End,
-                              const LiveIntervals *LIS) {
-  const auto BB = Begin->getParent();
-  const auto &MRI = BB->getParent()->getRegInfo();
-
-  const auto LiveIns = getLiveRegsBefore(*Begin, *LIS);
-  OS << "LIn RP: ";
-  getRegPressure(MRI, LiveIns).print(OS);
-
-  const auto BottomMI = End == BB->end() ? std::prev(End) : End;
-  const auto LiveOuts = getLiveRegsAfter(*BottomMI, *LIS);
-  OS << "LOt RP: ";
-  getRegPressure(MRI, LiveOuts).print(OS);
-}
-
-LLVM_DUMP_METHOD
-void GCNIterativeScheduler::printRegions(raw_ostream &OS) const {
-  const auto &ST = MF.getSubtarget<GCNSubtarget>();
-  for (const auto R : Regions) {
-    OS << "Region to schedule ";
-    printRegion(OS, R->Begin, R->End, LIS, 1);
-    printLivenessInfo(OS, R->Begin, R->End, LIS);
-    OS << "Max RP: ";
-    R->MaxPressure.print(OS, &ST);
-  }
-}
-
-LLVM_DUMP_METHOD
-void GCNIterativeScheduler::printSchedResult(raw_ostream &OS,
-                                             const Region *R,
-                                             const GCNRegPressure &RP) const {
-  OS << "\nAfter scheduling ";
-  printRegion(OS, R->Begin, R->End, LIS);
-  printSchedRP(OS, R->MaxPressure, RP);
-  OS << '\n';
-}
-
-LLVM_DUMP_METHOD
-void GCNIterativeScheduler::printSchedRP(raw_ostream &OS,
-                                         const GCNRegPressure &Before,
-                                         const GCNRegPressure &After) const {
-  const auto &ST = MF.getSubtarget<GCNSubtarget>();
-  OS << "RP before: ";
-  Before.print(OS, &ST);
-  OS << "RP after:  ";
-  After.print(OS, &ST);
-}
-#endif
-
-// DAG builder helper
-class GCNIterativeScheduler::BuildDAG {
-  GCNIterativeScheduler &Sch;
-  SmallVector<SUnit *, 8> TopRoots;
-
-  SmallVector<SUnit*, 8> BotRoots;
-public:
-  BuildDAG(const Region &R, GCNIterativeScheduler &_Sch)
-    : Sch(_Sch) {
-    auto BB = R.Begin->getParent();
-    Sch.BaseClass::startBlock(BB);
-    Sch.BaseClass::enterRegion(BB, R.Begin, R.End, R.NumRegionInstrs);
-
-    Sch.buildSchedGraph(Sch.AA, nullptr, nullptr, nullptr,
-                        /*TrackLaneMask*/true);
-    Sch.Topo.InitDAGTopologicalSorting();
-    Sch.findRootsAndBiasEdges(TopRoots, BotRoots);
-  }
-
-  ~BuildDAG() {
-    Sch.BaseClass::exitRegion();
-    Sch.BaseClass::finishBlock();
-  }
-
-  ArrayRef<const SUnit *> getTopRoots() const {
-    return TopRoots;
-  }
-  ArrayRef<SUnit*> getBottomRoots() const {
-    return BotRoots;
-  }
-};
-
-class GCNIterativeScheduler::OverrideLegacyStrategy {
-  GCNIterativeScheduler &Sch;
-  Region &Rgn;
-  std::unique_ptr<MachineSchedStrategy> SaveSchedImpl;
-  GCNRegPressure SaveMaxRP;
-
-public:
-  OverrideLegacyStrategy(Region &R,
-                         MachineSchedStrategy &OverrideStrategy,
-                         GCNIterativeScheduler &_Sch)
-    : Sch(_Sch)
-    , Rgn(R)
-    , SaveSchedImpl(std::move(_Sch.SchedImpl))
-    , SaveMaxRP(R.MaxPressure) {
-    Sch.SchedImpl.reset(&OverrideStrategy);
-    auto BB = R.Begin->getParent();
-    Sch.BaseClass::startBlock(BB);
-    Sch.BaseClass::enterRegion(BB, R.Begin, R.End, R.NumRegionInstrs);
-  }
-
-  ~OverrideLegacyStrategy() {
-    Sch.BaseClass::exitRegion();
-    Sch.BaseClass::finishBlock();
-    Sch.SchedImpl.release();
-    Sch.SchedImpl = std::move(SaveSchedImpl);
-  }
-
-  void schedule() {
-    assert(Sch.RegionBegin == Rgn.Begin && Sch.RegionEnd == Rgn.End);
-    LLVM_DEBUG(dbgs() << "\nScheduling ";
-               printRegion(dbgs(), Rgn.Begin, Rgn.End, Sch.LIS, 2));
-    Sch.BaseClass::schedule();
-
-    // Unfortunatelly placeDebugValues incorrectly modifies RegionEnd, restore
-    Sch.RegionEnd = Rgn.End;
-    //assert(Rgn.End == Sch.RegionEnd);
-    Rgn.Begin = Sch.RegionBegin;
-    Rgn.MaxPressure.clear();
-  }
-
-  void restoreOrder() {
-    assert(Sch.RegionBegin == Rgn.Begin && Sch.RegionEnd == Rgn.End);
-    // DAG SUnits are stored using original region's order
-    // so just use SUnits as the restoring schedule
-    Sch.scheduleRegion(Rgn, Sch.SUnits, SaveMaxRP);
-  }
-};
-
-namespace {
-
-// just a stub to make base class happy
-class SchedStrategyStub : public MachineSchedStrategy {
-public:
-  bool shouldTrackPressure() const override { return false; }
-  bool shouldTrackLaneMasks() const override { return false; }
-  void initialize(ScheduleDAGMI *DAG) override {}
-  SUnit *pickNode(bool &IsTopNode) override { return nullptr; }
-  void schedNode(SUnit *SU, bool IsTopNode) override {}
-  void releaseTopNode(SUnit *SU) override {}
-  void releaseBottomNode(SUnit *SU) override {}
-};
-
-} // end anonymous namespace
-
-GCNIterativeScheduler::GCNIterativeScheduler(MachineSchedContext *C,
-                                             StrategyKind S)
-  : BaseClass(C, llvm::make_unique<SchedStrategyStub>())
-  , Context(C)
-  , Strategy(S)
-  , UPTracker(*LIS) {
-}
-
-// returns max pressure for a region
-GCNRegPressure
-GCNIterativeScheduler::getRegionPressure(MachineBasicBlock::iterator Begin,
-                                         MachineBasicBlock::iterator End)
-  const {
-  // For the purpose of pressure tracking bottom inst of the region should
-  // be also processed. End is either BB end, BB terminator inst or sched
-  // boundary inst.
-  auto const BBEnd = Begin->getParent()->end();
-  auto const BottomMI = End == BBEnd ? std::prev(End) : End;
-
-  // scheduleRegions walks bottom to top, so its likely we just get next
-  // instruction to track
-  auto AfterBottomMI = std::next(BottomMI);
-  if (AfterBottomMI == BBEnd ||
-      &*AfterBottomMI != UPTracker.getLastTrackedMI()) {
-    UPTracker.reset(*BottomMI);
-  } else {
-    assert(UPTracker.isValid());
-  }
-
-  for (auto I = BottomMI; I != Begin; --I)
-    UPTracker.recede(*I);
-
-  UPTracker.recede(*Begin);
-
-  assert(UPTracker.isValid() ||
-         (dbgs() << "Tracked region ",
-          printRegion(dbgs(), Begin, End, LIS), false));
-  return UPTracker.moveMaxPressure();
-}
-
-// returns max pressure for a tentative schedule
-template <typename Range> GCNRegPressure
-GCNIterativeScheduler::getSchedulePressure(const Region &R,
-                                           Range &&Schedule) const {
-  auto const BBEnd = R.Begin->getParent()->end();
-  GCNUpwardRPTracker RPTracker(*LIS);
-  if (R.End != BBEnd) {
-    // R.End points to the boundary instruction but the
-    // schedule doesn't include it
-    RPTracker.reset(*R.End);
-    RPTracker.recede(*R.End);
-  } else {
-    // R.End doesn't point to the boundary instruction
-    RPTracker.reset(*std::prev(BBEnd));
-  }
-  for (auto I = Schedule.end(), B = Schedule.begin(); I != B;) {
-    RPTracker.recede(*getMachineInstr(*--I));
-  }
-  return RPTracker.moveMaxPressure();
-}
-
-void GCNIterativeScheduler::enterRegion(MachineBasicBlock *BB, // overriden
-                                        MachineBasicBlock::iterator Begin,
-                                        MachineBasicBlock::iterator End,
-                                        unsigned NumRegionInstrs) {
-  BaseClass::enterRegion(BB, Begin, End, NumRegionInstrs);
-  if (NumRegionInstrs > 2) {
-    Regions.push_back(
-      new (Alloc.Allocate())
-      Region { Begin, End, NumRegionInstrs,
-               getRegionPressure(Begin, End), nullptr });
-  }
-}
-
-void GCNIterativeScheduler::schedule() { // overriden
-  // do nothing
-  LLVM_DEBUG(printLivenessInfo(dbgs(), RegionBegin, RegionEnd, LIS);
-             if (!Regions.empty() && Regions.back()->Begin == RegionBegin) {
-               dbgs() << "Max RP: ";
-               Regions.back()->MaxPressure.print(
-                   dbgs(), &MF.getSubtarget<GCNSubtarget>());
-             } dbgs()
-             << '\n';);
-}
-
-void GCNIterativeScheduler::finalizeSchedule() { // overriden
-  if (Regions.empty())
-    return;
-  switch (Strategy) {
-  case SCHEDULE_MINREGONLY: scheduleMinReg(); break;
-  case SCHEDULE_MINREGFORCED: scheduleMinReg(true); break;
-  case SCHEDULE_LEGACYMAXOCCUPANCY: scheduleLegacyMaxOccupancy(); break;
-  case SCHEDULE_ILP: scheduleILP(false); break;
-  }
-}
-
-// Detach schedule from SUnits and interleave it with debug values.
-// Returned schedule becomes independent of DAG state.
-std::vector<MachineInstr*>
-GCNIterativeScheduler::detachSchedule(ScheduleRef Schedule) const {
-  std::vector<MachineInstr*> Res;
-  Res.reserve(Schedule.size() * 2);
-
-  if (FirstDbgValue)
-    Res.push_back(FirstDbgValue);
-
-  const auto DbgB = DbgValues.begin(), DbgE = DbgValues.end();
-  for (auto SU : Schedule) {
-    Res.push_back(SU->getInstr());
-    const auto &D = std::find_if(DbgB, DbgE, [SU](decltype(*DbgB) &P) {
-      return P.second == SU->getInstr();
-    });
-    if (D != DbgE)
-      Res.push_back(D->first);
-  }
-  return Res;
-}
-
-void GCNIterativeScheduler::setBestSchedule(Region &R,
-                                            ScheduleRef Schedule,
-                                            const GCNRegPressure &MaxRP) {
-  R.BestSchedule.reset(
-    new TentativeSchedule{ detachSchedule(Schedule), MaxRP });
-}
-
-void GCNIterativeScheduler::scheduleBest(Region &R) {
-  assert(R.BestSchedule.get() && "No schedule specified");
-  scheduleRegion(R, R.BestSchedule->Schedule, R.BestSchedule->MaxPressure);
-  R.BestSchedule.reset();
-}
-
-// minimal required region scheduler, works for ranges of SUnits*,
-// SUnits or MachineIntrs*
-template <typename Range>
-void GCNIterativeScheduler::scheduleRegion(Region &R, Range &&Schedule,
-                                           const GCNRegPressure &MaxRP) {
-  assert(RegionBegin == R.Begin && RegionEnd == R.End);
-  assert(LIS != nullptr);
-#ifndef NDEBUG
-  const auto SchedMaxRP = getSchedulePressure(R, Schedule);
-#endif
-  auto BB = R.Begin->getParent();
-  auto Top = R.Begin;
-  for (const auto &I : Schedule) {
-    auto MI = getMachineInstr(I);
-    if (MI != &*Top) {
-      BB->remove(MI);
-      BB->insert(Top, MI);
-      if (!MI->isDebugInstr())
-        LIS->handleMove(*MI, true);
-    }
-    if (!MI->isDebugInstr()) {
-      // Reset read - undef flags and update them later.
-      for (auto &Op : MI->operands())
-        if (Op.isReg() && Op.isDef())
-          Op.setIsUndef(false);
-
-      RegisterOperands RegOpers;
-      RegOpers.collect(*MI, *TRI, MRI, /*ShouldTrackLaneMasks*/true,
-                                       /*IgnoreDead*/false);
-      // Adjust liveness and add missing dead+read-undef flags.
-      auto SlotIdx = LIS->getInstructionIndex(*MI).getRegSlot();
-      RegOpers.adjustLaneLiveness(*LIS, MRI, SlotIdx, MI);
-    }
-    Top = std::next(MI->getIterator());
-  }
-  RegionBegin = getMachineInstr(Schedule.front());
-
-  // Schedule consisting of MachineInstr* is considered 'detached'
-  // and already interleaved with debug values
-  if (!std::is_same<decltype(*Schedule.begin()), MachineInstr*>::value) {
-    placeDebugValues();
-    // Unfortunatelly placeDebugValues incorrectly modifies RegionEnd, restore
-    //assert(R.End == RegionEnd);
-    RegionEnd = R.End;
-  }
-
-  R.Begin = RegionBegin;
-  R.MaxPressure = MaxRP;
-
-#ifndef NDEBUG
-  const auto RegionMaxRP = getRegionPressure(R);
-  const auto &ST = MF.getSubtarget<GCNSubtarget>();
-#endif
-  assert((SchedMaxRP == RegionMaxRP && (MaxRP.empty() || SchedMaxRP == MaxRP))
-  || (dbgs() << "Max RP mismatch!!!\n"
-                "RP for schedule (calculated): ",
-      SchedMaxRP.print(dbgs(), &ST),
-      dbgs() << "RP for schedule (reported): ",
-      MaxRP.print(dbgs(), &ST),
-      dbgs() << "RP after scheduling: ",
-      RegionMaxRP.print(dbgs(), &ST),
-      false));
-}
-
-// Sort recorded regions by pressure - highest at the front
-void GCNIterativeScheduler::sortRegionsByPressure(unsigned TargetOcc) {
-  const auto &ST = MF.getSubtarget<GCNSubtarget>();
-  llvm::sort(Regions, [&ST, TargetOcc](const Region *R1, const Region *R2) {
-    return R2->MaxPressure.less(ST, R1->MaxPressure, TargetOcc);
-  });
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// Legacy MaxOccupancy Strategy
-
-// Tries to increase occupancy applying minreg scheduler for a sequence of
-// most demanding regions. Obtained schedules are saved as BestSchedule for a
-// region.
-// TargetOcc is the best achievable occupancy for a kernel.
-// Returns better occupancy on success or current occupancy on fail.
-// BestSchedules aren't deleted on fail.
-unsigned GCNIterativeScheduler::tryMaximizeOccupancy(unsigned TargetOcc) {
-  // TODO: assert Regions are sorted descending by pressure
-  const auto &ST = MF.getSubtarget<GCNSubtarget>();
-  const auto Occ = Regions.front()->MaxPressure.getOccupancy(ST);
-  LLVM_DEBUG(dbgs() << "Trying to improve occupancy, target = " << TargetOcc
-                    << ", current = " << Occ << '\n');
-
-  auto NewOcc = TargetOcc;
-  for (auto R : Regions) {
-    if (R->MaxPressure.getOccupancy(ST) >= NewOcc)
-      break;
-
-    LLVM_DEBUG(printRegion(dbgs(), R->Begin, R->End, LIS, 3);
-               printLivenessInfo(dbgs(), R->Begin, R->End, LIS));
-
-    BuildDAG DAG(*R, *this);
-    const auto MinSchedule = makeMinRegSchedule(DAG.getTopRoots(), *this);
-    const auto MaxRP = getSchedulePressure(*R, MinSchedule);
-    LLVM_DEBUG(dbgs() << "Occupancy improvement attempt:\n";
-               printSchedRP(dbgs(), R->MaxPressure, MaxRP));
-
-    NewOcc = std::min(NewOcc, MaxRP.getOccupancy(ST));
-    if (NewOcc <= Occ)
-      break;
-
-    setBestSchedule(*R, MinSchedule, MaxRP);
-  }
-  LLVM_DEBUG(dbgs() << "New occupancy = " << NewOcc
-                    << ", prev occupancy = " << Occ << '\n');
-  if (NewOcc > Occ) {
-    SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
-    MFI->increaseOccupancy(MF, NewOcc);
-  }
-
-  return std::max(NewOcc, Occ);
-}
-
-void GCNIterativeScheduler::scheduleLegacyMaxOccupancy(
-  bool TryMaximizeOccupancy) {
-  const auto &ST = MF.getSubtarget<GCNSubtarget>();
-  SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
-  auto TgtOcc = MFI->getMinAllowedOccupancy();
-
-  sortRegionsByPressure(TgtOcc);
-  auto Occ = Regions.front()->MaxPressure.getOccupancy(ST);
-
-  if (TryMaximizeOccupancy && Occ < TgtOcc)
-    Occ = tryMaximizeOccupancy(TgtOcc);
-
-  // This is really weird but for some magic scheduling regions twice
-  // gives performance improvement
-  const int NumPasses = Occ < TgtOcc ? 2 : 1;
-
-  TgtOcc = std::min(Occ, TgtOcc);
-  LLVM_DEBUG(dbgs() << "Scheduling using default scheduler, "
-                       "target occupancy = "
-                    << TgtOcc << '\n');
-  GCNMaxOccupancySchedStrategy LStrgy(Context);
-  unsigned FinalOccupancy = std::min(Occ, MFI->getOccupancy());
-
-  for (int I = 0; I < NumPasses; ++I) {
-    // running first pass with TargetOccupancy = 0 mimics previous scheduling
-    // approach and is a performance magic
-    LStrgy.setTargetOccupancy(I == 0 ? 0 : TgtOcc);
-    for (auto R : Regions) {
-      OverrideLegacyStrategy Ovr(*R, LStrgy, *this);
-
-      Ovr.schedule();
-      const auto RP = getRegionPressure(*R);
-      LLVM_DEBUG(printSchedRP(dbgs(), R->MaxPressure, RP));
-
-      if (RP.getOccupancy(ST) < TgtOcc) {
-        LLVM_DEBUG(dbgs() << "Didn't fit into target occupancy O" << TgtOcc);
-        if (R->BestSchedule.get() &&
-            R->BestSchedule->MaxPressure.getOccupancy(ST) >= TgtOcc) {
-          LLVM_DEBUG(dbgs() << ", scheduling minimal register\n");
-          scheduleBest(*R);
-        } else {
-          LLVM_DEBUG(dbgs() << ", restoring\n");
-          Ovr.restoreOrder();
-          assert(R->MaxPressure.getOccupancy(ST) >= TgtOcc);
-        }
-      }
-      FinalOccupancy = std::min(FinalOccupancy, RP.getOccupancy(ST));
-    }
-  }
-  MFI->limitOccupancy(FinalOccupancy);
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// Minimal Register Strategy
-
-void GCNIterativeScheduler::scheduleMinReg(bool force) {
-  const auto &ST = MF.getSubtarget<GCNSubtarget>();
-  const SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
-  const auto TgtOcc = MFI->getOccupancy();
-  sortRegionsByPressure(TgtOcc);
-
-  auto MaxPressure = Regions.front()->MaxPressure;
-  for (auto R : Regions) {
-    if (!force && R->MaxPressure.less(ST, MaxPressure, TgtOcc))
-      break;
-
-    BuildDAG DAG(*R, *this);
-    const auto MinSchedule = makeMinRegSchedule(DAG.getTopRoots(), *this);
-
-    const auto RP = getSchedulePressure(*R, MinSchedule);
-    LLVM_DEBUG(if (R->MaxPressure.less(ST, RP, TgtOcc)) {
-      dbgs() << "\nWarning: Pressure becomes worse after minreg!";
-      printSchedRP(dbgs(), R->MaxPressure, RP);
-    });
-
-    if (!force && MaxPressure.less(ST, RP, TgtOcc))
-      break;
-
-    scheduleRegion(*R, MinSchedule, RP);
-    LLVM_DEBUG(printSchedResult(dbgs(), R, RP));
-
-    MaxPressure = RP;
-  }
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// ILP scheduler port
-
-void GCNIterativeScheduler::scheduleILP(
-  bool TryMaximizeOccupancy) {
-  const auto &ST = MF.getSubtarget<GCNSubtarget>();
-  SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
-  auto TgtOcc = MFI->getMinAllowedOccupancy();
-
-  sortRegionsByPressure(TgtOcc);
-  auto Occ = Regions.front()->MaxPressure.getOccupancy(ST);
-
-  if (TryMaximizeOccupancy && Occ < TgtOcc)
-    Occ = tryMaximizeOccupancy(TgtOcc);
-
-  TgtOcc = std::min(Occ, TgtOcc);
-  LLVM_DEBUG(dbgs() << "Scheduling using default scheduler, "
-                       "target occupancy = "
-                    << TgtOcc << '\n');
-
-  unsigned FinalOccupancy = std::min(Occ, MFI->getOccupancy());
-  for (auto R : Regions) {
-    BuildDAG DAG(*R, *this);
-    const auto ILPSchedule = makeGCNILPScheduler(DAG.getBottomRoots(), *this);
-
-    const auto RP = getSchedulePressure(*R, ILPSchedule);
-    LLVM_DEBUG(printSchedRP(dbgs(), R->MaxPressure, RP));
-
-    if (RP.getOccupancy(ST) < TgtOcc) {
-      LLVM_DEBUG(dbgs() << "Didn't fit into target occupancy O" << TgtOcc);
-      if (R->BestSchedule.get() &&
-        R->BestSchedule->MaxPressure.getOccupancy(ST) >= TgtOcc) {
-        LLVM_DEBUG(dbgs() << ", scheduling minimal register\n");
-        scheduleBest(*R);
-      }
-    } else {
-      scheduleRegion(*R, ILPSchedule, RP);
-      LLVM_DEBUG(printSchedResult(dbgs(), R, RP));
-      FinalOccupancy = std::min(FinalOccupancy, RP.getOccupancy(ST));
-    }
-  }
-  MFI->limitOccupancy(FinalOccupancy);
-}