1 //===- SCCP.cpp - 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 // \file
10 // This file implements sparse conditional constant 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_SCALAR_SCCP_H
21 #define LLVM_TRANSFORMS_SCALAR_SCCP_H
22 
23 #include "llvm/ADT/STLExtras.h"
24 #include "llvm/Analysis/TargetLibraryInfo.h"
25 #include "llvm/Analysis/TargetTransformInfo.h"
26 #include "llvm/IR/DataLayout.h"
27 #include "llvm/IR/Function.h"
28 #include "llvm/IR/Module.h"
29 #include "llvm/IR/PassManager.h"
30 #include "llvm/Transforms/Utils/PredicateInfo.h"
31 #include "llvm/Transforms/Utils/SCCPSolver.h"
32 
33 namespace llvm {
34 
35 class PostDominatorTree;
36 
37 /// This pass performs function-level constant propagation and merging.
38 class SCCPPass : public PassInfoMixin<SCCPPass> {
39 public:
40   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
41 };
42 
43 bool runIPSCCP(Module &M, const DataLayout &DL,
44                std::function<const TargetLibraryInfo &(Function &)> GetTLI,
45                function_ref<AnalysisResultsForFn(Function &)> getAnalysis);
46 
47 bool runFunctionSpecialization(
48     Module &M, const DataLayout &DL,
49     std::function<TargetLibraryInfo &(Function &)> GetTLI,
50     std::function<TargetTransformInfo &(Function &)> GetTTI,
51     std::function<AssumptionCache &(Function &)> GetAC,
52     function_ref<AnalysisResultsForFn(Function &)> GetAnalysis);
53 } // end namespace llvm
54 
55 #endif // LLVM_TRANSFORMS_SCALAR_SCCP_H
56