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 | |
19 | namespace llvm { |
20 | |
21 | class 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. |
30 | struct 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 | |