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 20namespace 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. 29class EarlyCSEPass { 30public: 31 static StringRef name() { return "EarlyCSEPass"; } 32 33 /// \brief Run the pass over the function. 34 PreservedAnalyses run(Function &F, AnalysisManager<Function> *AM); 35}; 36 37} 38 39#endif 40