File Manager

003 File Manager

Current Path: /usr/src/contrib/llvm-project/llvm/include/llvm/CodeGen/GlobalISel

usr / src / contrib / llvm-project / llvm / include / llvm / CodeGen / GlobalISel /

📁 ..
📄 CSEInfo.h(8.84 KB)
📄 CSEMIRBuilder.h(4.77 KB)
📄 CallLowering.h(14.21 KB)
📄 Combiner.h(1.43 KB)
📄 CombinerHelper.h(10.74 KB)
📄 CombinerInfo.h(2.75 KB)
📄 ConstantFoldingMIRBuilder.h(2.63 KB)
📄 GISelChangeObserver.h(4.96 KB)
📄 GISelKnownBits.h(4.33 KB)
📄 GISelWorkList.h(3.64 KB)
📄 IRTranslator.h(24.76 KB)
📄 InlineAsmLowering.h(2.34 KB)
📄 InstructionSelect.h(1.96 KB)
📄 InstructionSelector.h(18.61 KB)
📄 InstructionSelectorImpl.h(44.71 KB)
📄 LegalizationArtifactCombiner.h(34.75 KB)
📄 Legalizer.h(2.54 KB)
📄 LegalizerHelper.h(15.8 KB)
📄 LegalizerInfo.h(59.78 KB)
📄 Localizer.h(3.57 KB)
📄 LostDebugLocObserver.h(2.06 KB)
📄 MIPatternMatch.h(11.95 KB)
📄 MachineIRBuilder.h(67.51 KB)
📄 RegBankSelect.h(25.09 KB)
📄 RegisterBank.h(3.18 KB)
📄 RegisterBankInfo.h(30.01 KB)
📄 Utils.h(9.4 KB)

Editing: GISelKnownBits.h

//===- llvm/CodeGen/GlobalISel/GISelKnownBits.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
//
//===----------------------------------------------------------------------===//
//
/// Provides analysis for querying information about KnownBits during GISel
/// passes.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_GLOBALISEL_KNOWNBITSINFO_H
#define LLVM_CODEGEN_GLOBALISEL_KNOWNBITSINFO_H

#include "llvm/ADT/DenseSet.h"
#include "llvm/CodeGen/GlobalISel/GISelChangeObserver.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/Register.h"
#include "llvm/IR/PassManager.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/KnownBits.h"

namespace llvm {

class TargetLowering;
class DataLayout;

class GISelKnownBits : public GISelChangeObserver {
  MachineFunction &MF;
  MachineRegisterInfo &MRI;
  const TargetLowering &TL;
  const DataLayout &DL;
  unsigned MaxDepth;
  /// Cache maintained during a computeKnownBits request.
  SmallDenseMap<Register, KnownBits, 16> ComputeKnownBitsCache;

public:
  GISelKnownBits(MachineFunction &MF, unsigned MaxDepth = 6);
  virtual ~GISelKnownBits() = default;
  void setMF(MachineFunction &MF);

const MachineFunction &getMachineFunction() const {
    return MF;
  }

const DataLayout &getDataLayout() const {
    return DL;
  }

virtual void computeKnownBitsImpl(Register R, KnownBits &Known,
                                    const APInt &DemandedElts,
                                    unsigned Depth = 0);

unsigned computeNumSignBits(Register R, const APInt &DemandedElts,
                              unsigned Depth = 0);
  unsigned computeNumSignBits(Register R, unsigned Depth = 0);

// KnownBitsAPI
  KnownBits getKnownBits(Register R);
  KnownBits getKnownBits(Register R, const APInt &DemandedElts,
                         unsigned Depth = 0);

// Calls getKnownBits for first operand def of MI.
  KnownBits getKnownBits(MachineInstr &MI);
  APInt getKnownZeroes(Register R);
  APInt getKnownOnes(Register R);

/// \return true if 'V & Mask' is known to be zero in DemandedElts. We use
  /// this predicate to simplify operations downstream.
  /// Mask is known to be zero for bits that V cannot have.
  bool maskedValueIsZero(Register Val, const APInt &Mask) {
    return Mask.isSubsetOf(getKnownBits(Val).Zero);
  }

/// \return true if the sign bit of Op is known to be zero.  We use this
  /// predicate to simplify operations downstream.
  bool signBitIsZero(Register Op);

static void computeKnownBitsForAlignment(KnownBits &Known,
                                           Align Alignment) {
    // The low bits are known zero if the pointer is aligned.
    Known.Zero.setLowBits(Log2(Alignment));
  }

/// \return The known alignment for the pointer-like value \p R.
  Align computeKnownAlignment(Register R, unsigned Depth = 0);

// Observer API. No-op for non-caching implementation.
  void erasingInstr(MachineInstr &MI) override{};
  void createdInstr(MachineInstr &MI) override{};
  void changingInstr(MachineInstr &MI) override{};
  void changedInstr(MachineInstr &MI) override{};

protected:
  unsigned getMaxDepth() const { return MaxDepth; }
};

/// To use KnownBitsInfo analysis in a pass,
/// KnownBitsInfo &Info = getAnalysis<GISelKnownBitsInfoAnalysis>().get(MF);
/// Add to observer if the Info is caching.
/// WrapperObserver.addObserver(Info);

/// Eventually add other features such as caching/ser/deserializing
/// to MIR etc. Those implementations can derive from GISelKnownBits
/// and override computeKnownBitsImpl.
class GISelKnownBitsAnalysis : public MachineFunctionPass {
  std::unique_ptr<GISelKnownBits> Info;

public:
  static char ID;
  GISelKnownBitsAnalysis() : MachineFunctionPass(ID) {
    initializeGISelKnownBitsAnalysisPass(*PassRegistry::getPassRegistry());
  }
  GISelKnownBits &get(MachineFunction &MF) {
    if (!Info)
      Info = std::make_unique<GISelKnownBits>(MF);
    return *Info.get();
  }
  void getAnalysisUsage(AnalysisUsage &AU) const override;
  bool runOnMachineFunction(MachineFunction &MF) override;
  void releaseMemory() override { Info.reset(); }
};
} // namespace llvm

#endif // ifdef

003 File Manager

Editing: GISelKnownBits.h

Upload File

Create Folder