//===-- MCSubtargetInfo.cpp - Subtarget Information -----------------------===//

//

//                     The LLVM Compiler Infrastructure

//

// This file is distributed under the University of Illinois Open Source

// License. See LICENSE.TXT for details.

//

//===----------------------------------------------------------------------===//

#include "llvm/MC/MCSubtargetInfo.h"

#include "llvm/ADT/StringRef.h"

#include "llvm/ADT/Triple.h"

#include "llvm/MC/SubtargetFeature.h"

#include "llvm/Support/raw_ostream.h"

#include <algorithm>

using namespace llvm_ks;

static FeatureBitset getFeatures(StringRef CPU, StringRef FS,

                                 ArrayRef<SubtargetFeatureKV> ProcDesc,

                                 ArrayRef<SubtargetFeatureKV> ProcFeatures) {

  SubtargetFeatures Features(FS);

  return Features.getFeatureBits(CPU, ProcDesc, ProcFeatures);

}

void MCSubtargetInfo::InitMCProcessorInfo(StringRef CPU, StringRef FS) {

  FeatureBits = getFeatures(CPU, FS, ProcDesc, ProcFeatures);

  if (!CPU.empty() && ProcSchedModels)

      CPUSchedModel = &getSchedModelForCPU(CPU);

}

void MCSubtargetInfo::setDefaultFeatures(StringRef CPU, StringRef FS) {

  FeatureBits = getFeatures(CPU, FS, ProcDesc, ProcFeatures);

}

MCSubtargetInfo::MCSubtargetInfo(

    const Triple &TT, StringRef C, StringRef FS,

    ArrayRef<SubtargetFeatureKV> PF, ArrayRef<SubtargetFeatureKV> PD,

    const SubtargetInfoKV *ProcSched)

    : TargetTriple(TT), CPU(C), ProcFeatures(PF), ProcDesc(PD),

    ProcSchedModels(ProcSched) {

  InitMCProcessorInfo(CPU, FS);

}

/// ToggleFeature - Toggle a feature and returns the re-computed feature

/// bits. This version does not change the implied bits.

FeatureBitset MCSubtargetInfo::ToggleFeature(uint64_t FB) {

  FeatureBits.flip(FB);

  return FeatureBits;

}

FeatureBitset MCSubtargetInfo::ToggleFeature(const FeatureBitset &FB) {

  FeatureBits ^= FB;

  return FeatureBits;

}

/// ToggleFeature - Toggle a feature and returns the re-computed feature

/// bits. This version will also change all implied bits.

FeatureBitset MCSubtargetInfo::ToggleFeature(StringRef FS) {

  SubtargetFeatures::ToggleFeature(FeatureBits, FS, ProcFeatures);

  return FeatureBits;

}

FeatureBitset MCSubtargetInfo::ApplyFeatureFlag(StringRef FS) {

  SubtargetFeatures::ApplyFeatureFlag(FeatureBits, FS, ProcFeatures);

  return FeatureBits;

}

const MCSchedModel &MCSubtargetInfo::getSchedModelForCPU(StringRef CPU) const {

  assert(ProcSchedModels && "Processor machine model not available!");

  ArrayRef<SubtargetInfoKV> SchedModels(ProcSchedModels, ProcDesc.size());

  assert(std::is_sorted(SchedModels.begin(), SchedModels.end(),

                    [](const SubtargetInfoKV &LHS, const SubtargetInfoKV &RHS) {

                      return strcmp(LHS.Key, RHS.Key) < 0;

                    }) &&

         "Processor machine model table is not sorted");

  // Find entry

  auto Found =

    std::lower_bound(SchedModels.begin(), SchedModels.end(), CPU);

#if 0

  if (Found == SchedModels.end() || StringRef(Found->Key) != CPU) {

    if (CPU != "help") // Don't error if the user asked for help.

      errs() << "'" << CPU

             << "' is not a recognized processor for this target"

             << " (ignoring processor)\n";

    return MCSchedModel::GetDefaultSchedModel();

  }

#endif

  assert(Found->Value && "Missing processor SchedModel value");

  return *(const MCSchedModel *)Found->Value;

}