1 //===- EarlyCSE.h - Simple and fast CSE pass --------------------*- 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 /// \file 10 /// This file provides the interface for a simple, fast CSE pass. 11 /// 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_TRANSFORMS_SCALAR_EARLYCSE_H 15 #define LLVM_TRANSFORMS_SCALAR_EARLYCSE_H 16 17 #include "llvm/IR/Function.h" 18 #include "llvm/IR/PassManager.h" 19 20 namespace llvm { 21 22 /// \brief A simple and fast domtree-based CSE pass. 23 /// 24 /// This pass does a simple depth-first walk over the dominator tree, 25 /// eliminating trivially redundant instructions and using instsimplify to 26 /// canonicalize things as it goes. It is intended to be fast and catch obvious 27 /// cases so that instcombine and other passes are more effective. It is 28 /// expected that a later pass of GVN will catch the interesting/hard cases. 29 struct EarlyCSEPass : PassInfoMixin<EarlyCSEPass> { 30 /// \brief Run the pass over the function. 31 PreservedAnalyses run(Function &F, AnalysisManager<Function> &AM); 32 }; 33 34 } 35 36 #endif 37