rename_map.hh revision 2632:1bb2f91485ea
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_CPU_RENAME_MAP_HH__ 34#define __CPU_O3_CPU_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(unsigned _numLogicalIntRegs, 67 unsigned _numPhysicalIntRegs, 68 unsigned _numLogicalFloatRegs, 69 unsigned _numPhysicalFloatRegs, 70 unsigned _numMiscRegs, 71 RegIndex _intZeroReg, 72 RegIndex _floatZeroReg); 73 74 /** Destructor. */ 75 ~SimpleRenameMap(); 76 77 void setFreeList(SimpleFreeList *fl_ptr); 78 79 //Tell rename map to get a free physical register for a given 80 //architected register. Not sure it should have a return value, 81 //but perhaps it should have some sort of fault in case there are 82 //no free registers. 83 RenameInfo rename(RegIndex arch_reg); 84 85 PhysRegIndex lookup(RegIndex phys_reg); 86 87 bool isReady(PhysRegIndex arch_reg); 88 89 /** 90 * Marks the given register as ready, meaning that its value has been 91 * calculated and written to the register file. 92 * @param ready_reg The index of the physical register that is now ready. 93 */ 94 void markAsReady(PhysRegIndex ready_reg); 95 96 void setEntry(RegIndex arch_reg, PhysRegIndex renamed_reg); 97 98 void squash(std::vector<RegIndex> freed_regs, 99 std::vector<UnmapInfo> unmaps); 100 101 int numFreeEntries(); 102 103 private: 104 /** Number of logical integer registers. */ 105 int numLogicalIntRegs; 106 107 /** Number of physical integer registers. */ 108 int numPhysicalIntRegs; 109 110 /** Number of logical floating point registers. */ 111 int numLogicalFloatRegs; 112 113 /** Number of physical floating point registers. */ 114 int numPhysicalFloatRegs; 115 116 /** Number of miscellaneous registers. */ 117 int numMiscRegs; 118 119 /** Number of logical integer + float registers. */ 120 int numLogicalRegs; 121 122 /** Number of physical integer + float registers. */ 123 int numPhysicalRegs; 124 125 /** The integer zero register. This implementation assumes it is always 126 * zero and never can be anything else. 127 */ 128 RegIndex intZeroReg; 129 130 /** The floating point zero register. This implementation assumes it is 131 * always zero and never can be anything else. 132 */ 133 RegIndex floatZeroReg; 134 135 class RenameEntry 136 { 137 public: 138 PhysRegIndex physical_reg; 139 bool valid; 140 141 RenameEntry() 142 : physical_reg(0), valid(false) 143 { } 144 }; 145 146 /** Integer rename map. */ 147 RenameEntry *intRenameMap; 148 149 /** Floating point rename map. */ 150 RenameEntry *floatRenameMap; 151 152 /** Free list interface. */ 153 SimpleFreeList *freeList; 154 155 // Might want to make all these scoreboards into one large scoreboard. 156 157 /** Scoreboard of physical integer registers, saying whether or not they 158 * are ready. 159 */ 160 std::vector<bool> intScoreboard; 161 162 /** Scoreboard of physical floating registers, saying whether or not they 163 * are ready. 164 */ 165 std::vector<bool> floatScoreboard; 166 167 /** Scoreboard of miscellaneous registers, saying whether or not they 168 * are ready. 169 */ 170 std::vector<bool> miscScoreboard; 171}; 172 173#endif //__CPU_O3_CPU_RENAME_MAP_HH__ 174