1 //===- LoopRotationUtils.h - Utilities to perform loop rotation -*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file provides utilities to convert a loop into a loop with bottom test. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_TRANSFORMS_UTILS_LOOPROTATIONUTILS_H 15 #define LLVM_TRANSFORMS_UTILS_LOOPROTATIONUTILS_H 16 17 namespace llvm { 18 19 class AssumptionCache; 20 class DominatorTree; 21 class Loop; 22 class LoopInfo; 23 class MemorySSAUpdater; 24 class ScalarEvolution; 25 struct SimplifyQuery; 26 class TargetTransformInfo; 27 28 /// Convert a loop into a loop with bottom test. It may 29 /// perform loop latch simplication as well if the flag RotationOnly 30 /// is false. The flag Threshold represents the size threshold of the loop 31 /// header. If the loop header's size exceeds the threshold, the loop rotation 32 /// will give up. The flag IsUtilMode controls the heuristic used in the 33 /// LoopRotation. If it is true, the profitability heuristic will be ignored. 34 bool LoopRotation(Loop *L, LoopInfo *LI, const TargetTransformInfo *TTI, 35 AssumptionCache *AC, DominatorTree *DT, ScalarEvolution *SE, 36 MemorySSAUpdater *MSSAU, const SimplifyQuery &SQ, 37 bool RotationOnly, unsigned Threshold, bool IsUtilMode); 38 39 } // namespace llvm 40 41 #endif 42