1 //===- EarlyCSE.h - Simple and fast CSE pass --------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// This file provides the interface for a simple, fast CSE pass.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_TRANSFORMS_SCALAR_EARLYCSE_H
16 #define LLVM_TRANSFORMS_SCALAR_EARLYCSE_H
18 #include "llvm/IR/PassManager.h"
24 /// A simple and fast domtree-based CSE pass.
26 /// This pass does a simple depth-first walk over the dominator tree,
27 /// eliminating trivially redundant instructions and using instsimplify to
28 /// canonicalize things as it goes. It is intended to be fast and catch obvious
29 /// cases so that instcombine and other passes are more effective. It is
30 /// expected that a later pass of GVN will catch the interesting/hard cases.
31 struct EarlyCSEPass : PassInfoMixin<EarlyCSEPass> {
32 EarlyCSEPass(bool UseMemorySSA = false) : UseMemorySSA(UseMemorySSA) {}
34 /// Run the pass over the function.
35 PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
40 } // end namespace llvm
42 #endif // LLVM_TRANSFORMS_SCALAR_EARLYCSE_H