1//===- EarlyCSE.h - Simple and fast CSE pass --------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
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/PassManager.h"
18
19namespace llvm {
20
21class Function;
22
23/// A simple and fast domtree-based CSE pass.
24///
25/// This pass does a simple depth-first walk over the dominator tree,
26/// eliminating trivially redundant instructions and using instsimplify to
27/// canonicalize things as it goes. It is intended to be fast and catch obvious
28/// cases so that instcombine and other passes are more effective. It is
29/// expected that a later pass of GVN will catch the interesting/hard cases.
30struct EarlyCSEPass : PassInfoMixin<EarlyCSEPass> {
31 EarlyCSEPass(bool UseMemorySSA = false) : UseMemorySSA(UseMemorySSA) {}
32
33 /// Run the pass over the function.
34 PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
35 void printPipeline(raw_ostream &OS,
36 function_ref<StringRef(StringRef)> MapClassName2PassName);
37
38 bool UseMemorySSA;
39};
40
41} // end namespace llvm
42
43#endif // LLVM_TRANSFORMS_SCALAR_EARLYCSE_H
44

source code of llvm/include/llvm/Transforms/Scalar/EarlyCSE.h