/* Copyright 2018 The OpenXLA Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==============================================================================*/

#ifndef XLA_SERVICE_CONDITIONAL_TO_SELECT_H_
#define XLA_SERVICE_CONDITIONAL_TO_SELECT_H_

#include "absl/container/flat_hash_set.h"
#include "absl/status/statusor.h"
#include "absl/strings/string_view.h"
#include "xla/hlo/ir/hlo_module.h"
#include "xla/hlo/pass/hlo_pass_interface.h"

namespace xla {

// A pass which transforms conditionals to selects in places where conditionals
// are legal, but not currently supported by the backends (e.g. inside kMap)
class ConditionalToSelect : public HloModulePass {
 public:
  ~ConditionalToSelect() override = default;
  absl::string_view name() const override { return "conditional-to-select"; }

  // Run conditional to select on the given computation. Returns whether the
  // computation was changed.
  using HloPassInterface::Run;
  absl::StatusOr<bool> Run(
      HloModule* module,
      const absl::flat_hash_set<absl::string_view>& execution_threads) override;
};

}  // namespace xla

#endif  // XLA_SERVICE_CONDITIONAL_TO_SELECT_H_