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38 lines
1.4 KiB
38 lines
1.4 KiB
4 months ago
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//===------ FlattenAlgo.h --------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Main algorithm of the FlattenSchedulePass. This is a separate file to avoid
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// the unittest for this requiring linking against LLVM.
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//
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//===----------------------------------------------------------------------===//
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#ifndef POLLY_FLATTENALGO_H
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#define POLLY_FLATTENALGO_H
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#include "isl/isl-noexceptions.h"
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namespace polly {
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/// Recursively flatten a schedule.
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///
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/// Reduce the number of scatter dimensions as much as possible without changing
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/// the relative order of instances in a schedule. Ideally, this results in a
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/// single scatter dimension, but it may not always be possible to combine
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/// dimensions, eg. if a dimension is unbounded. In worst case, the original
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/// schedule is returned.
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///
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/// Schedules with fewer dimensions may be easier to understand for humans, but
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/// it should make no difference to the computer.
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///
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/// @param Schedule The input schedule.
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///
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/// @return The flattened schedule.
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isl::union_map flattenSchedule(isl::union_map Schedule);
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} // namespace polly
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#endif /* POLLY_FLATTENALGO_H */
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