include/llvm/Transforms/Utils/LoopRotationUtils.h

   1 //===- LoopRotationUtils.h - Utilities to perform loop rotation -*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file provides utilities to convert a loop into a loop with bottom test.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_TRANSFORMS_UTILS_LOOPROTATIONUTILS_H
  14 #define LLVM_TRANSFORMS_UTILS_LOOPROTATIONUTILS_H
  15
  16 namespace llvm {
  17
  18 class AssumptionCache;
  19 class DominatorTree;
  20 class Loop;
  21 class LoopInfo;
  22 class MemorySSAUpdater;
  23 class ScalarEvolution;
  24 struct SimplifyQuery;
  25 class TargetTransformInfo;
  26
  27 /// Convert a loop into a loop with bottom test. It may
  28 /// perform loop latch simplication as well if the flag RotationOnly
  29 /// is false. The flag Threshold represents the size threshold of the loop
  30 /// header. If the loop header's size exceeds the threshold, the loop rotation
  31 /// will give up. The flag IsUtilMode controls the heuristic used in the
  32 /// LoopRotation. If it is true, the profitability heuristic will be ignored.
  33 bool LoopRotation(Loop *L, LoopInfo *LI, const TargetTransformInfo *TTI,
  34                   AssumptionCache *AC, DominatorTree *DT, ScalarEvolution *SE,
  35                   MemorySSAUpdater *MSSAU, const SimplifyQuery &SQ,
  36                   bool RotationOnly, unsigned Threshold, bool IsUtilMode);
  37
  38 } // namespace llvm
  39
  40 #endif