IOBarrierElimination.hpp

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/*
 * Copyright 2026 Nico Reißmann <nico.reissmann@gmail.com>
 * See COPYING for terms of redistribution.
 */
 
#ifndef JLM_LLVM_OPT_IOBARRIERELIMINATION_HPP
#define JLM_LLVM_OPT_IOBARRIERELIMINATION_HPP
 
#include <jlm/rvsdg/gamma.hpp>
#include <jlm/rvsdg/Transformation.hpp>
 
namespace jlm::llvm
{
 
class IOBarrierElimination final : public rvsdg::Transformation
{
  class Context;
  class Statistics;
 
public:
  ~IOBarrierElimination() override;
 
  IOBarrierElimination();
 
  IOBarrierElimination(const IOBarrierElimination &) = delete;
 
  IOBarrierElimination(IOBarrierElimination &&) = delete;
 
  IOBarrierElimination &
  operator=(const IOBarrierElimination &) = delete;
 
  IOBarrierElimination &
  operator=(IOBarrierElimination &&) = delete;
 
  void
  Run(rvsdg::RvsdgModule & module, util::StatisticsCollector & statisticsCollector) override;
 
  static void
  normalizeMemoryHoistBarriers(rvsdg::Region & region);
 
private:
  void
  markOutputs(rvsdg::Region & region);
 
  void
  propagateSize(rvsdg::Graph & graph);
 
  void
  encodeSize(rvsdg::Graph & graph);
 
  void
  sweepRegion(rvsdg::Region & region);
 
  size_t
  getDereferenceableSize(const rvsdg::GammaNode::EntryVar & entryVar) const;
 
  std::unique_ptr<Context> context_{};
};
 
}
 
#endif