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 
20 namespace llvm {
21 namespace 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