store_set.cc revision 2670:9107b8bd08cd
1/* 2 * Copyright (c) 2004-2006 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#include "base/trace.hh" 32#include "cpu/o3/store_set.hh" 33 34StoreSet::StoreSet(int _SSIT_size, int _LFST_size) 35 : SSITSize(_SSIT_size), LFSTSize(_LFST_size) 36{ 37 DPRINTF(StoreSet, "StoreSet: Creating store set object.\n"); 38 DPRINTF(StoreSet, "StoreSet: SSIT size: %i, LFST size: %i.\n", 39 SSITSize, LFSTSize); 40 41 SSIT.resize(SSITSize); 42 43 validSSIT.resize(SSITSize); 44 45 for (int i = 0; i < SSITSize; ++i) 46 validSSIT[i] = false; 47 48 LFST.resize(LFSTSize); 49 50 validLFST.resize(LFSTSize); 51 52 for (int i = 0; i < LFSTSize; ++i) { 53 validLFST[i] = false; 54 LFST[i] = 0; 55 } 56 57 indexMask = SSITSize - 1; 58 59 offsetBits = 2; 60} 61 62StoreSet::~StoreSet() 63{ 64} 65 66void 67StoreSet::init(int _SSIT_size, int _LFST_size) 68{ 69 SSITSize = _SSIT_size; 70 LFSTSize = _LFST_size; 71 72 DPRINTF(StoreSet, "StoreSet: Creating store set object.\n"); 73 DPRINTF(StoreSet, "StoreSet: SSIT size: %i, LFST size: %i.\n", 74 SSITSize, LFSTSize); 75 76 SSIT.resize(SSITSize); 77 78 validSSIT.resize(SSITSize); 79 80 for (int i = 0; i < SSITSize; ++i) 81 validSSIT[i] = false; 82 83 LFST.resize(LFSTSize); 84 85 validLFST.resize(LFSTSize); 86 87 for (int i = 0; i < LFSTSize; ++i) { 88 validLFST[i] = false; 89 LFST[i] = 0; 90 } 91 92 indexMask = SSITSize - 1; 93 94 offsetBits = 2; 95} 96 97 98void 99StoreSet::violation(Addr store_PC, Addr load_PC) 100{ 101 int load_index = calcIndex(load_PC); 102 int store_index = calcIndex(store_PC); 103 104 assert(load_index < SSITSize && store_index < SSITSize); 105 106 bool valid_load_SSID = validSSIT[load_index]; 107 bool valid_store_SSID = validSSIT[store_index]; 108 109 if (!valid_load_SSID && !valid_store_SSID) { 110 // Calculate a new SSID here. 111 SSID new_set = calcSSID(load_PC); 112 113 validSSIT[load_index] = true; 114 115 SSIT[load_index] = new_set; 116 117 validSSIT[store_index] = true; 118 119 SSIT[store_index] = new_set; 120 121 assert(new_set < LFSTSize); 122 123 DPRINTF(StoreSet, "StoreSet: Neither load nor store had a valid " 124 "storeset, creating a new one: %i for load %#x, store %#x\n", 125 new_set, load_PC, store_PC); 126 } else if (valid_load_SSID && !valid_store_SSID) { 127 SSID load_SSID = SSIT[load_index]; 128 129 validSSIT[store_index] = true; 130 131 SSIT[store_index] = load_SSID; 132 133 assert(load_SSID < LFSTSize); 134 135 DPRINTF(StoreSet, "StoreSet: Load had a valid store set. Adding " 136 "store to that set: %i for load %#x, store %#x\n", 137 load_SSID, load_PC, store_PC); 138 } else if (!valid_load_SSID && valid_store_SSID) { 139 SSID store_SSID = SSIT[store_index]; 140 141 validSSIT[load_index] = true; 142 143 SSIT[load_index] = store_SSID; 144 145 DPRINTF(StoreSet, "StoreSet: Store had a valid store set: %i for " 146 "load %#x, store %#x\n", 147 store_SSID, load_PC, store_PC); 148 } else { 149 SSID load_SSID = SSIT[load_index]; 150 SSID store_SSID = SSIT[store_index]; 151 152 assert(load_SSID < LFSTSize && store_SSID < LFSTSize); 153 154 // The store set with the lower number wins 155 if (store_SSID > load_SSID) { 156 SSIT[store_index] = load_SSID; 157 158 DPRINTF(StoreSet, "StoreSet: Load had smaller store set: %i; " 159 "for load %#x, store %#x\n", 160 load_SSID, load_PC, store_PC); 161 } else { 162 SSIT[load_index] = store_SSID; 163 164 DPRINTF(StoreSet, "StoreSet: Store had smaller store set: %i; " 165 "for load %#x, store %#x\n", 166 store_SSID, load_PC, store_PC); 167 } 168 } 169} 170 171void 172StoreSet::insertLoad(Addr load_PC, InstSeqNum load_seq_num) 173{ 174 // Does nothing. 175 return; 176} 177 178void 179StoreSet::insertStore(Addr store_PC, InstSeqNum store_seq_num, 180 unsigned tid) 181{ 182 int index = calcIndex(store_PC); 183 184 int store_SSID; 185 186 assert(index < SSITSize); 187 188 if (!validSSIT[index]) { 189 // Do nothing if there's no valid entry. 190 return; 191 } else { 192 store_SSID = SSIT[index]; 193 194 assert(store_SSID < LFSTSize); 195 196 // Update the last store that was fetched with the current one. 197 LFST[store_SSID] = store_seq_num; 198 199 validLFST[store_SSID] = 1; 200 201 storeList[store_seq_num] = store_SSID; 202 203 DPRINTF(StoreSet, "Store %#x updated the LFST, SSID: %i\n", 204 store_PC, store_SSID); 205 } 206} 207 208InstSeqNum 209StoreSet::checkInst(Addr PC) 210{ 211 int index = calcIndex(PC); 212 213 int inst_SSID; 214 215 assert(index < SSITSize); 216 217 if (!validSSIT[index]) { 218 DPRINTF(StoreSet, "Inst %#x with index %i had no SSID\n", 219 PC, index); 220 221 // Return 0 if there's no valid entry. 222 return 0; 223 } else { 224 inst_SSID = SSIT[index]; 225 226 assert(inst_SSID < LFSTSize); 227 228 if (!validLFST[inst_SSID]) { 229 230 DPRINTF(StoreSet, "Inst %#x with index %i and SSID %i had no " 231 "dependency\n", PC, index, inst_SSID); 232 233 return 0; 234 } else { 235 DPRINTF(StoreSet, "Inst %#x with index %i and SSID %i had LFST " 236 "inum of %i\n", PC, index, inst_SSID, LFST[inst_SSID]); 237 238 return LFST[inst_SSID]; 239 } 240 } 241} 242 243void 244StoreSet::issued(Addr issued_PC, InstSeqNum issued_seq_num, bool is_store) 245{ 246 // This only is updated upon a store being issued. 247 if (!is_store) { 248 return; 249 } 250 251 int index = calcIndex(issued_PC); 252 253 int store_SSID; 254 255 assert(index < SSITSize); 256 257 SeqNumMapIt store_list_it = storeList.find(issued_seq_num); 258 259 if (store_list_it != storeList.end()) { 260 storeList.erase(store_list_it); 261 } 262 263 // Make sure the SSIT still has a valid entry for the issued store. 264 if (!validSSIT[index]) { 265 return; 266 } 267 268 store_SSID = SSIT[index]; 269 270 assert(store_SSID < LFSTSize); 271 272 // If the last fetched store in the store set refers to the store that 273 // was just issued, then invalidate the entry. 274 if (validLFST[store_SSID] && LFST[store_SSID] == issued_seq_num) { 275 DPRINTF(StoreSet, "StoreSet: store invalidated itself in LFST.\n"); 276 validLFST[store_SSID] = false; 277 } 278} 279 280void 281StoreSet::squash(InstSeqNum squashed_num, unsigned tid) 282{ 283 DPRINTF(StoreSet, "StoreSet: Squashing until inum %i\n", 284 squashed_num); 285 286 int idx; 287 SeqNumMapIt store_list_it = storeList.begin(); 288 289 //@todo:Fix to only delete from correct thread 290 while (!storeList.empty()) { 291 idx = (*store_list_it).second; 292 293 if ((*store_list_it).first <= squashed_num) { 294 break; 295 } 296 297 bool younger = LFST[idx] > squashed_num; 298 299 if (validLFST[idx] && younger) { 300 DPRINTF(StoreSet, "Squashed [sn:%lli]\n", LFST[idx]); 301 validLFST[idx] = false; 302 303 storeList.erase(store_list_it++); 304 } else if (!validLFST[idx] && younger) { 305 storeList.erase(store_list_it++); 306 } 307 } 308} 309 310void 311StoreSet::clear() 312{ 313 for (int i = 0; i < SSITSize; ++i) { 314 validSSIT[i] = false; 315 } 316 317 for (int i = 0; i < LFSTSize; ++i) { 318 validLFST[i] = false; 319 } 320 321 storeList.clear(); 322} 323