| //===- LoopRotationUtils.h - Utilities to perform loop rotation -*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // 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 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, |
| const SimplifyQuery &SQ, bool RotationOnly, |
| unsigned Threshold, bool IsUtilMode); |
| |
| } // namespace llvm |
| |
| #endif |