1 | //===- InstSimplifyPass.h ---------------------------------------*- 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 | /// \file |
9 | /// |
10 | /// Defines passes for running instruction simplification across chunks of IR. |
11 | /// |
12 | //===----------------------------------------------------------------------===// |
13 | |
14 | #ifndef LLVM_TRANSFORMS_SCALAR_INSTSIMPLIFYPASS_H |
15 | #define LLVM_TRANSFORMS_SCALAR_INSTSIMPLIFYPASS_H |
16 | |
17 | #include "llvm/IR/PassManager.h" |
18 | |
19 | namespace llvm { |
20 | |
21 | /// Run instruction simplification across each instruction in the function. |
22 | /// |
23 | /// Instruction simplification has useful constraints in some contexts: |
24 | /// - It will never introduce *new* instructions. |
25 | /// - There is no need to iterate to a fixed point. |
26 | /// |
27 | /// Many passes use instruction simplification as a library facility, but it may |
28 | /// also be useful (in tests and other contexts) to have access to this very |
29 | /// restricted transform at a pass granularity. However, for a much more |
30 | /// powerful and comprehensive peephole optimization engine, see the |
31 | /// `instcombine` pass instead. |
32 | class InstSimplifyPass : public PassInfoMixin<InstSimplifyPass> { |
33 | public: |
34 | PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM); |
35 | }; |
36 | |
37 | } // end namespace llvm |
38 | |
39 | #endif // LLVM_TRANSFORMS_SCALAR_INSTSIMPLIFYPASS_H |
40 | |