rename_map.hh revision 2329
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 29// Todo: Create destructor. 30// Have it so that there's a more meaningful name given to the variable 31// that marks the beginning of the FP registers. 32 33#ifndef __CPU_O3_RENAME_MAP_HH__ 34#define __CPU_O3_RENAME_MAP_HH__ 35 36#include <iostream> 37#include <utility> 38#include <vector> 39 40#include "cpu/o3/free_list.hh" 41//For RegIndex 42#include "arch/isa_traits.hh" 43 44class SimpleRenameMap 45{ 46 protected: 47 typedef TheISA::RegIndex RegIndex; 48 public: 49 /** 50 * Pair of a logical register and a physical register. Tells the 51 * previous mapping of a logical register to a physical register. 52 * Used to roll back the rename map to a previous state. 53 */ 54 typedef std::pair<RegIndex, PhysRegIndex> UnmapInfo; 55 56 /** 57 * Pair of a physical register and a physical register. Used to 58 * return the physical register that a logical register has been 59 * renamed to, and the previous physical register that the same 60 * logical register was previously mapped to. 61 */ 62 typedef std::pair<PhysRegIndex, PhysRegIndex> RenameInfo; 63 64 public: 65 //Constructor 66 SimpleRenameMap() {}; 67 68 /** Destructor. */ 69 ~SimpleRenameMap(); 70 71 void init(unsigned _numLogicalIntRegs, 72 unsigned _numPhysicalIntRegs, 73 PhysRegIndex &_int_reg_start, 74 75 unsigned _numLogicalFloatRegs, 76 unsigned _numPhysicalFloatRegs, 77 PhysRegIndex &_float_reg_start, 78 79 unsigned _numMiscRegs, 80 81 RegIndex _intZeroReg, 82 RegIndex _floatZeroReg, 83 84 int id, 85 bool bindRegs); 86 87 void setFreeList(SimpleFreeList *fl_ptr); 88 89 //Tell rename map to get a free physical register for a given 90 //architected register. Not sure it should have a return value, 91 //but perhaps it should have some sort of fault in case there are 92 //no free registers. 93 RenameInfo rename(RegIndex arch_reg); 94 95 PhysRegIndex lookup(RegIndex phys_reg); 96 97 /** 98 * Marks the given register as ready, meaning that its value has been 99 * calculated and written to the register file. 100 * @param ready_reg The index of the physical register that is now ready. 101 */ 102 void setEntry(RegIndex arch_reg, PhysRegIndex renamed_reg); 103 104 int numFreeEntries(); 105 106 private: 107 /** Rename Map ID */ 108 int id; 109 110 /** Number of logical integer registers. */ 111 int numLogicalIntRegs; 112 113 /** Number of physical integer registers. */ 114 int numPhysicalIntRegs; 115 116 /** Number of logical floating point registers. */ 117 int numLogicalFloatRegs; 118 119 /** Number of physical floating point registers. */ 120 int numPhysicalFloatRegs; 121 122 /** Number of miscellaneous registers. */ 123 int numMiscRegs; 124 125 /** Number of logical integer + float registers. */ 126 int numLogicalRegs; 127 128 /** Number of physical integer + float registers. */ 129 int numPhysicalRegs; 130 131 /** The integer zero register. This implementation assumes it is always 132 * zero and never can be anything else. 133 */ 134 RegIndex intZeroReg; 135 136 /** The floating point zero register. This implementation assumes it is 137 * always zero and never can be anything else. 138 */ 139 RegIndex floatZeroReg; 140 141 class RenameEntry 142 { 143 public: 144 PhysRegIndex physical_reg; 145 bool valid; 146 147 RenameEntry() 148 : physical_reg(0), valid(false) 149 { } 150 }; 151 152 //Change this to private 153 private: 154 /** Integer rename map. */ 155 std::vector<RenameEntry> intRenameMap; 156 157 /** Floating point rename map. */ 158 std::vector<RenameEntry> floatRenameMap; 159 160 private: 161 /** Free list interface. */ 162 SimpleFreeList *freeList; 163}; 164 165#endif //__CPU_O3_RENAME_MAP_HH__ 166