1 | //===- SCCP.h - Sparse Conditional Constant Propagation ---------*- 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 | // This pass implements interprocedural sparse conditional constant |
10 | // propagation and merging. |
11 | // |
12 | // Specifically, this: |
13 | // * Assumes values are constant unless proven otherwise |
14 | // * Assumes BasicBlocks are dead unless proven otherwise |
15 | // * Proves values to be constant, and replaces them with constants |
16 | // * Proves conditional branches to be unconditional |
17 | // |
18 | //===----------------------------------------------------------------------===// |
19 | |
20 | #ifndef LLVM_TRANSFORMS_IPO_SCCP_H |
21 | #define LLVM_TRANSFORMS_IPO_SCCP_H |
22 | |
23 | #include "llvm/IR/PassManager.h" |
24 | |
25 | namespace llvm { |
26 | |
27 | class Module; |
28 | |
29 | /// A set of parameters to control various transforms performed by IPSCCP pass. |
30 | /// Each of the boolean parameters can be set to: |
31 | /// true - enabling the transformation. |
32 | /// false - disabling the transformation. |
33 | /// Intended use is to create a default object, modify parameters with |
34 | /// additional setters and then pass it to IPSCCP. |
35 | struct IPSCCPOptions { |
36 | bool AllowFuncSpec; |
37 | |
38 | IPSCCPOptions(bool AllowFuncSpec = true) : AllowFuncSpec(AllowFuncSpec) {} |
39 | |
40 | /// Enables or disables Specialization of Functions. |
41 | IPSCCPOptions &setFuncSpec(bool FuncSpec) { |
42 | AllowFuncSpec = FuncSpec; |
43 | return *this; |
44 | } |
45 | }; |
46 | |
47 | /// Pass to perform interprocedural constant propagation. |
48 | class IPSCCPPass : public PassInfoMixin<IPSCCPPass> { |
49 | IPSCCPOptions Options; |
50 | |
51 | public: |
52 | IPSCCPPass() = default; |
53 | |
54 | IPSCCPPass(IPSCCPOptions Options) : Options(Options) {} |
55 | |
56 | PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM); |
57 | |
58 | bool isFuncSpecEnabled() const { return Options.AllowFuncSpec; } |
59 | }; |
60 | |
61 | } // end namespace llvm |
62 | |
63 | #endif // LLVM_TRANSFORMS_IPO_SCCP_H |
64 | |