rename_map.hh revision 2980:eab855f06b79
1/* 2 * Copyright (c) 2004-2005 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Kevin Lim 29 */ 30 31// Todo: Create destructor. 32// Have it so that there's a more meaningful name given to the variable 33// that marks the beginning of the FP registers. 34 35#ifndef __CPU_O3_RENAME_MAP_HH__ 36#define __CPU_O3_RENAME_MAP_HH__ 37 38#include <iostream> 39#include <utility> 40#include <vector> 41 42#include "cpu/o3/free_list.hh" 43#include "arch/types.hh" 44 45class SimpleRenameMap 46{ 47 protected: 48 typedef TheISA::RegIndex RegIndex; 49 public: 50 /** 51 * Pair of a logical register and a physical register. Tells the 52 * previous mapping of a logical register to a physical register. 53 * Used to roll back the rename map to a previous state. 54 */ 55 typedef std::pair<RegIndex, PhysRegIndex> UnmapInfo; 56 57 /** 58 * Pair of a physical register and a physical register. Used to 59 * return the physical register that a logical register has been 60 * renamed to, and the previous physical register that the same 61 * logical register was previously mapped to. 62 */ 63 typedef std::pair<PhysRegIndex, PhysRegIndex> RenameInfo; 64 65 public: 66 /** Default constructor. init() must be called prior to use. */ 67 SimpleRenameMap() {}; 68 69 /** Destructor. */ 70 ~SimpleRenameMap(); 71 72 /** Initializes rename map with given parameters. */ 73 void init(unsigned _numLogicalIntRegs, 74 unsigned _numPhysicalIntRegs, 75 PhysRegIndex &_int_reg_start, 76 77 unsigned _numLogicalFloatRegs, 78 unsigned _numPhysicalFloatRegs, 79 PhysRegIndex &_float_reg_start, 80 81 unsigned _numMiscRegs, 82 83 RegIndex _intZeroReg, 84 RegIndex _floatZeroReg, 85 86 int id, 87 bool bindRegs); 88 89 /** Sets the free list used with this rename map. */ 90 void setFreeList(SimpleFreeList *fl_ptr); 91 92 //Tell rename map to get a free physical register for a given 93 //architected register. Not sure it should have a return value, 94 //but perhaps it should have some sort of fault in case there are 95 //no free registers. 96 RenameInfo rename(RegIndex arch_reg); 97 98 PhysRegIndex lookup(RegIndex phys_reg); 99 100 /** 101 * Marks the given register as ready, meaning that its value has been 102 * calculated and written to the register file. 103 * @param ready_reg The index of the physical register that is now ready. 104 */ 105 void setEntry(RegIndex arch_reg, PhysRegIndex renamed_reg); 106 107 int numFreeEntries(); 108 109 private: 110 /** Rename Map ID */ 111 int id; 112 113 /** Number of logical integer registers. */ 114 int numLogicalIntRegs; 115 116 /** Number of physical integer registers. */ 117 int numPhysicalIntRegs; 118 119 /** Number of logical floating point registers. */ 120 int numLogicalFloatRegs; 121 122 /** Number of physical floating point registers. */ 123 int numPhysicalFloatRegs; 124 125 /** Number of miscellaneous registers. */ 126 int numMiscRegs; 127 128 /** Number of logical integer + float registers. */ 129 int numLogicalRegs; 130 131 /** Number of physical integer + float registers. */ 132 int numPhysicalRegs; 133 134 /** The integer zero register. This implementation assumes it is always 135 * zero and never can be anything else. 136 */ 137 RegIndex intZeroReg; 138 139 /** The floating point zero register. This implementation assumes it is 140 * always zero and never can be anything else. 141 */ 142 RegIndex floatZeroReg; 143 144 class RenameEntry 145 { 146 public: 147 PhysRegIndex physical_reg; 148 bool valid; 149 150 RenameEntry() 151 : physical_reg(0), valid(false) 152 { } 153 }; 154 155 private: 156 /** Integer rename map. */ 157 std::vector<RenameEntry> intRenameMap; 158 159 /** Floating point rename map. */ 160 std::vector<RenameEntry> floatRenameMap; 161 162 private: 163 /** Free list interface. */ 164 SimpleFreeList *freeList; 165}; 166 167#endif //__CPU_O3_RENAME_MAP_HH__ 168