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 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 const SimplifyQuery &SQ, bool RotationOnly, 36 unsigned Threshold, bool IsUtilMode); 37 38 } // namespace llvm 39 40 #endif 41