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/STLFunctionalExtras.h"
24 #include "llvm/IR/PassManager.h"
25 
26 #include <functional>
27 
28 namespace llvm {
29 class AssumptionCache;
30 class DataLayout;
31 class Function;
32 class Module;
33 class TargetLibraryInfo;
34 class TargetTransformInfo;
35 struct AnalysisResultsForFn;
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 } // end namespace llvm
44 
45 #endif // LLVM_TRANSFORMS_SCALAR_SCCP_H
46