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  1. //===------- LoopBoundSplit.h - Split Loop Bound ----------------*- 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. #ifndef LLVM_TRANSFORMS_SCALAR_LOOPBOUNDSPLIT_H
  10. #define LLVM_TRANSFORMS_SCALAR_LOOPBOUNDSPLIT_H
  11.  
  12. #include "llvm/Analysis/LoopAnalysisManager.h"
  13. #include "llvm/IR/PassManager.h"
  14.  
  15. namespace llvm {
  16. class LPMUpdater;
  17. class Loop;
  18.  
  19. /// This pass transforms loops that contain a conditional branch with induction
  20. /// variable. For example, it transforms left code to right code:
  21. ///
  22. ///                              newbound = min(n, c)
  23. ///  while (iv < n) {            while(iv < newbound) {
  24. ///    A                           A
  25. ///    if (iv < c)                 B
  26. ///      B                         C
  27. ///    C                         }
  28. ///                              if (iv != n) {
  29. ///                                while (iv < n) {
  30. ///                                  A
  31. ///                                  C
  32. ///                                }
  33. ///                              }
  34. class LoopBoundSplitPass : public PassInfoMixin<LoopBoundSplitPass> {
  35. public:
  36.   PreservedAnalyses run(Loop &L, LoopAnalysisManager &AM,
  37.                         LoopStandardAnalysisResults &AR, LPMUpdater &U);
  38. };
  39.  
  40. } // end namespace llvm
  41.  
  42. #endif // LLVM_TRANSFORMS_SCALAR_LOOPBOUNDSPLIT_H
  43.