Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

//===- LoopRotationUtils.h - Utilities to perform loop rotation -*- C++ -*-===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

//

// This file provides utilities to convert a loop into a loop with bottom test.

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_TRANSFORMS_UTILS_LOOPROTATIONUTILS_H

#define LLVM_TRANSFORMS_UTILS_LOOPROTATIONUTILS_H

namespace llvm {

class AssumptionCache;

class DominatorTree;

class Loop;

class LoopInfo;

class MemorySSAUpdater;

class ScalarEvolution;

struct SimplifyQuery;

class TargetTransformInfo;

/// Convert a loop into a loop with bottom test. It may

/// perform loop latch simplication as well if the flag RotationOnly

/// is false. The flag Threshold represents the size threshold of the loop

/// header. If the loop header's size exceeds the threshold, the loop rotation

/// will give up. The flag IsUtilMode controls the heuristic used in the

/// LoopRotation. If it is true, the profitability heuristic will be ignored.

bool LoopRotation(Loop *L, LoopInfo *LI, const TargetTransformInfo *TTI,

                  AssumptionCache *AC, DominatorTree *DT, ScalarEvolution *SE,

                  MemorySSAUpdater *MSSAU, const SimplifyQuery &SQ,

                  bool RotationOnly, unsigned Threshold, bool IsUtilMode,

                  bool PrepareForLTO = false);

} // namespace llvm

#endif