46 lines
1.7 KiB
C++
46 lines
1.7 KiB
C++
//===- 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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#include "llvm/Support/Compiler.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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LLVM_ABI bool LoopRotation(Loop *L, LoopInfo *LI,
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const TargetTransformInfo *TTI, AssumptionCache *AC,
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DominatorTree *DT, ScalarEvolution *SE,
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MemorySSAUpdater *MSSAU, const SimplifyQuery &SQ,
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bool RotationOnly, unsigned Threshold,
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bool IsUtilMode, bool PrepareForLTO = false,
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bool CheckExitCount = false);
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} // namespace llvm
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#endif
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