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  1. //===- llvm/Transforms/Utils/LoopPeel.h ----- Peeling utilities -*- 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 defines some loop peeling utilities. It does not define any
  10. // actual pass or policy.
  11. //
  12. //===----------------------------------------------------------------------===//
  13.  
  14. #ifndef LLVM_TRANSFORMS_UTILS_LOOPPEEL_H
  15. #define LLVM_TRANSFORMS_UTILS_LOOPPEEL_H
  16.  
  17. #include "llvm/Analysis/TargetTransformInfo.h"
  18. #include "llvm/Transforms/Utils/ValueMapper.h"
  19.  
  20. namespace llvm {
  21.  
  22. bool canPeel(const Loop *L);
  23.  
  24. /// VMap is the value-map that maps instructions from the original loop to
  25. /// instructions in the last peeled-off iteration.
  26. bool peelLoop(Loop *L, unsigned PeelCount, LoopInfo *LI, ScalarEvolution *SE,
  27.               DominatorTree &DT, AssumptionCache *AC, bool PreserveLCSSA,
  28.               ValueToValueMapTy &VMap);
  29.  
  30. TargetTransformInfo::PeelingPreferences
  31. gatherPeelingPreferences(Loop *L, ScalarEvolution &SE,
  32.                          const TargetTransformInfo &TTI,
  33.                          std::optional<bool> UserAllowPeeling,
  34.                          std::optional<bool> UserAllowProfileBasedPeeling,
  35.                          bool UnrollingSpecficValues = false);
  36.  
  37. void computePeelCount(Loop *L, unsigned LoopSize,
  38.                       TargetTransformInfo::PeelingPreferences &PP,
  39.                       unsigned TripCount, DominatorTree &DT,
  40.                       ScalarEvolution &SE, AssumptionCache *AC = nullptr,
  41.                       unsigned Threshold = UINT_MAX);
  42.  
  43. } // end namespace llvm
  44.  
  45. #endif // LLVM_TRANSFORMS_UTILS_LOOPPEEL_H
  46.