1//===- Solution.h - PBQP Solution -------------------------------*- 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// PBQP Solution class.
10//
11//===----------------------------------------------------------------------===//
12
13#ifndef LLVM_CODEGEN_PBQP_SOLUTION_H
14#define LLVM_CODEGEN_PBQP_SOLUTION_H
15
16#include "llvm/CodeGen/PBQP/Graph.h"
17#include <cassert>
18#include <map>
19
20namespace llvm {
21namespace PBQP {
22
23  /// Represents a solution to a PBQP problem.
24  ///
25  /// To get the selection for each node in the problem use the getSelection method.
26  class Solution {
27  private:
28    using SelectionsMap = std::map<GraphBase::NodeId, unsigned>;
29    SelectionsMap selections;
30
31  public:
32    /// Initialise an empty solution.
33    Solution() = default;
34
35    /// Set the selection for a given node.
36    /// @param nodeId Node id.
37    /// @param selection Selection for nodeId.
38    void setSelection(GraphBase::NodeId nodeId, unsigned selection) {
39      selections[nodeId] = selection;
40    }
41
42    /// Get a node's selection.
43    /// @param nodeId Node id.
44    /// @return The selection for nodeId;
45    unsigned getSelection(GraphBase::NodeId nodeId) const {
46      SelectionsMap::const_iterator sItr = selections.find(nodeId);
47      assert(sItr != selections.end() && "No selection for node.");
48      return sItr->second;
49    }
50  };
51
52} // end namespace PBQP
53} // end namespace llvm
54
55#endif // LLVM_CODEGEN_PBQP_SOLUTION_H
56