42 lines
1.6 KiB
C
42 lines
1.6 KiB
C
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//===- LoopRotationUtils.h - Utilities to perform loop rotation -*- 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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// This file provides utilities to convert a loop into a loop with bottom test.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_LOOPROTATIONUTILS_H
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#define LLVM_TRANSFORMS_UTILS_LOOPROTATIONUTILS_H
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namespace llvm {
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class AssumptionCache;
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class DominatorTree;
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class Loop;
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class LoopInfo;
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class MemorySSAUpdater;
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class ScalarEvolution;
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struct SimplifyQuery;
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class TargetTransformInfo;
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/// Convert a loop into a loop with bottom test. It may
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/// perform loop latch simplication as well if the flag RotationOnly
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/// is false. The flag Threshold represents the size threshold of the loop
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/// header. If the loop header's size exceeds the threshold, the loop rotation
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/// will give up. The flag IsUtilMode controls the heuristic used in the
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/// LoopRotation. If it is true, the profitability heuristic will be ignored.
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bool LoopRotation(Loop *L, LoopInfo *LI, const TargetTransformInfo *TTI,
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AssumptionCache *AC, DominatorTree *DT, ScalarEvolution *SE,
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MemorySSAUpdater *MSSAU, const SimplifyQuery &SQ,
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bool RotationOnly, unsigned Threshold, bool IsUtilMode,
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bool PrepareForLTO = false);
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} // namespace llvm
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#endif
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