LLVM  8.0.0svn
EarlyCSE.h
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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 //
10 /// \file
11 /// This file provides the interface for a simple, fast CSE pass.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef LLVM_TRANSFORMS_SCALAR_EARLYCSE_H
16 #define LLVM_TRANSFORMS_SCALAR_EARLYCSE_H
17 
18 #include "llvm/IR/PassManager.h"
19 
20 namespace llvm {
21 
22 class Function;
23 
24 /// A simple and fast domtree-based CSE pass.
25 ///
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> {
33 
34  /// Run the pass over the function.
36 
38 };
39 
40 } // end namespace llvm
41 
42 #endif // LLVM_TRANSFORMS_SCALAR_EARLYCSE_H
A simple and fast domtree-based CSE pass.
Definition: EarlyCSE.h:31
This class represents lattice values for constants.
Definition: AllocatorList.h:24
F(f)
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM)
Run the pass over the function.
Definition: EarlyCSE.cpp:1226
A CRTP mix-in to automatically provide informational APIs needed for passes.
Definition: PassManager.h:366
A set of analyses that are preserved following a run of a transformation pass.
Definition: PassManager.h:154
EarlyCSEPass(bool UseMemorySSA=false)
Definition: EarlyCSE.h:32
A container for analyses that lazily runs them and caches their results.
This header defines various interfaces for pass management in LLVM.