1//===-- Solution.h ------- PBQP Solution ------------------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// PBQP Solution class. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CODEGEN_PBQP_SOLUTION_H 15#define LLVM_CODEGEN_PBQP_SOLUTION_H 16 17#include "Graph.h" 18#include "Math.h" 19#include <map> 20 21namespace llvm { 22namespace PBQP { 23 24 /// \brief Represents a solution to a PBQP problem. 25 /// 26 /// To get the selection for each node in the problem use the getSelection method. 27 class Solution { 28 private: 29 30 typedef std::map<GraphBase::NodeId, unsigned> SelectionsMap; 31 SelectionsMap selections; 32 33 unsigned r0Reductions, r1Reductions, r2Reductions, rNReductions; 34 35 public: 36 37 /// \brief Initialise an empty solution. 38 Solution() 39 : r0Reductions(0), r1Reductions(0), r2Reductions(0), rNReductions(0) {} 40 41 /// \brief Number of nodes for which selections have been made. 42 /// @return Number of nodes for which selections have been made. 43 unsigned numNodes() const { return selections.size(); } 44 45 /// \brief Records a reduction via the R0 rule. Should be called from the 46 /// solver only. 47 void recordR0() { ++r0Reductions; } 48 49 /// \brief Returns the number of R0 reductions applied to solve the problem. 50 unsigned numR0Reductions() const { return r0Reductions; } 51 52 /// \brief Records a reduction via the R1 rule. Should be called from the 53 /// solver only. 54 void recordR1() { ++r1Reductions; } 55 56 /// \brief Returns the number of R1 reductions applied to solve the problem. 57 unsigned numR1Reductions() const { return r1Reductions; } 58 59 /// \brief Records a reduction via the R2 rule. Should be called from the 60 /// solver only. 61 void recordR2() { ++r2Reductions; } 62 63 /// \brief Returns the number of R2 reductions applied to solve the problem. 64 unsigned numR2Reductions() const { return r2Reductions; } 65 66 /// \brief Records a reduction via the RN rule. Should be called from the 67 /// solver only. 68 void recordRN() { ++ rNReductions; } 69 70 /// \brief Returns the number of RN reductions applied to solve the problem. 71 unsigned numRNReductions() const { return rNReductions; } 72 73 /// \brief Set the selection for a given node. 74 /// @param nodeId Node id. 75 /// @param selection Selection for nodeId. 76 void setSelection(GraphBase::NodeId nodeId, unsigned selection) { 77 selections[nodeId] = selection; 78 } 79 80 /// \brief Get a node's selection. 81 /// @param nodeId Node id. 82 /// @return The selection for nodeId; 83 unsigned getSelection(GraphBase::NodeId nodeId) const { 84 SelectionsMap::const_iterator sItr = selections.find(nodeId); 85 assert(sItr != selections.end() && "No selection for node."); 86 return sItr->second; 87 } 88 89 }; 90 91} // namespace PBQP 92} // namespace llvm 93 94#endif // LLVM_CODEGEN_PBQP_SOLUTION_H 95