store_set.cc revision 6221:58a3c04e6344
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/intmath.hh" 32#include "base/misc.hh" 33#include "base/trace.hh" 34#include "cpu/o3/store_set.hh" 35 36StoreSet::StoreSet(int _SSIT_size, int _LFST_size) 37 : SSITSize(_SSIT_size), LFSTSize(_LFST_size) 38{ 39 DPRINTF(StoreSet, "StoreSet: Creating store set object.\n"); 40 DPRINTF(StoreSet, "StoreSet: SSIT size: %i, LFST size: %i.\n", 41 SSITSize, LFSTSize); 42 43 if (!isPowerOf2(SSITSize)) { 44 fatal("Invalid SSIT size!\n"); 45 } 46 47 SSIT.resize(SSITSize); 48 49 validSSIT.resize(SSITSize); 50 51 for (int i = 0; i < SSITSize; ++i) 52 validSSIT[i] = false; 53 54 if (!isPowerOf2(LFSTSize)) { 55 fatal("Invalid LFST size!\n"); 56 } 57 58 LFST.resize(LFSTSize); 59 60 validLFST.resize(LFSTSize); 61 62 for (int i = 0; i < LFSTSize; ++i) { 63 validLFST[i] = false; 64 LFST[i] = 0; 65 } 66 67 indexMask = SSITSize - 1; 68 69 offsetBits = 2; 70} 71 72StoreSet::~StoreSet() 73{ 74} 75 76void 77StoreSet::init(int _SSIT_size, int _LFST_size) 78{ 79 SSITSize = _SSIT_size; 80 LFSTSize = _LFST_size; 81 82 DPRINTF(StoreSet, "StoreSet: Creating store set object.\n"); 83 DPRINTF(StoreSet, "StoreSet: SSIT size: %i, LFST size: %i.\n", 84 SSITSize, LFSTSize); 85 86 SSIT.resize(SSITSize); 87 88 validSSIT.resize(SSITSize); 89 90 for (int i = 0; i < SSITSize; ++i) 91 validSSIT[i] = false; 92 93 LFST.resize(LFSTSize); 94 95 validLFST.resize(LFSTSize); 96 97 for (int i = 0; i < LFSTSize; ++i) { 98 validLFST[i] = false; 99 LFST[i] = 0; 100 } 101 102 indexMask = SSITSize - 1; 103 104 offsetBits = 2; 105} 106 107 108void 109StoreSet::violation(Addr store_PC, Addr load_PC) 110{ 111 int load_index = calcIndex(load_PC); 112 int store_index = calcIndex(store_PC); 113 114 assert(load_index < SSITSize && store_index < SSITSize); 115 116 bool valid_load_SSID = validSSIT[load_index]; 117 bool valid_store_SSID = validSSIT[store_index]; 118 119 if (!valid_load_SSID && !valid_store_SSID) { 120 // Calculate a new SSID here. 121 SSID new_set = calcSSID(load_PC); 122 123 validSSIT[load_index] = true; 124 125 SSIT[load_index] = new_set; 126 127 validSSIT[store_index] = true; 128 129 SSIT[store_index] = new_set; 130 131 assert(new_set < LFSTSize); 132 133 DPRINTF(StoreSet, "StoreSet: Neither load nor store had a valid " 134 "storeset, creating a new one: %i for load %#x, store %#x\n", 135 new_set, load_PC, store_PC); 136 } else if (valid_load_SSID && !valid_store_SSID) { 137 SSID load_SSID = SSIT[load_index]; 138 139 validSSIT[store_index] = true; 140 141 SSIT[store_index] = load_SSID; 142 143 assert(load_SSID < LFSTSize); 144 145 DPRINTF(StoreSet, "StoreSet: Load had a valid store set. Adding " 146 "store to that set: %i for load %#x, store %#x\n", 147 load_SSID, load_PC, store_PC); 148 } else if (!valid_load_SSID && valid_store_SSID) { 149 SSID store_SSID = SSIT[store_index]; 150 151 validSSIT[load_index] = true; 152 153 SSIT[load_index] = store_SSID; 154 155 DPRINTF(StoreSet, "StoreSet: Store had a valid store set: %i for " 156 "load %#x, store %#x\n", 157 store_SSID, load_PC, store_PC); 158 } else { 159 SSID load_SSID = SSIT[load_index]; 160 SSID store_SSID = SSIT[store_index]; 161 162 assert(load_SSID < LFSTSize && store_SSID < LFSTSize); 163 164 // The store set with the lower number wins 165 if (store_SSID > load_SSID) { 166 SSIT[store_index] = load_SSID; 167 168 DPRINTF(StoreSet, "StoreSet: Load had smaller store set: %i; " 169 "for load %#x, store %#x\n", 170 load_SSID, load_PC, store_PC); 171 } else { 172 SSIT[load_index] = store_SSID; 173 174 DPRINTF(StoreSet, "StoreSet: Store had smaller store set: %i; " 175 "for load %#x, store %#x\n", 176 store_SSID, load_PC, store_PC); 177 } 178 } 179} 180 181void 182StoreSet::insertLoad(Addr load_PC, InstSeqNum load_seq_num) 183{ 184 // Does nothing. 185 return; 186} 187 188void 189StoreSet::insertStore(Addr store_PC, InstSeqNum store_seq_num, ThreadID tid) 190{ 191 int index = calcIndex(store_PC); 192 193 int store_SSID; 194 195 assert(index < SSITSize); 196 197 if (!validSSIT[index]) { 198 // Do nothing if there's no valid entry. 199 return; 200 } else { 201 store_SSID = SSIT[index]; 202 203 assert(store_SSID < LFSTSize); 204 205 // Update the last store that was fetched with the current one. 206 LFST[store_SSID] = store_seq_num; 207 208 validLFST[store_SSID] = 1; 209 210 storeList[store_seq_num] = store_SSID; 211 212 DPRINTF(StoreSet, "Store %#x updated the LFST, SSID: %i\n", 213 store_PC, store_SSID); 214 } 215} 216 217InstSeqNum 218StoreSet::checkInst(Addr PC) 219{ 220 int index = calcIndex(PC); 221 222 int inst_SSID; 223 224 assert(index < SSITSize); 225 226 if (!validSSIT[index]) { 227 DPRINTF(StoreSet, "Inst %#x with index %i had no SSID\n", 228 PC, index); 229 230 // Return 0 if there's no valid entry. 231 return 0; 232 } else { 233 inst_SSID = SSIT[index]; 234 235 assert(inst_SSID < LFSTSize); 236 237 if (!validLFST[inst_SSID]) { 238 239 DPRINTF(StoreSet, "Inst %#x with index %i and SSID %i had no " 240 "dependency\n", PC, index, inst_SSID); 241 242 return 0; 243 } else { 244 DPRINTF(StoreSet, "Inst %#x with index %i and SSID %i had LFST " 245 "inum of %i\n", PC, index, inst_SSID, LFST[inst_SSID]); 246 247 return LFST[inst_SSID]; 248 } 249 } 250} 251 252void 253StoreSet::issued(Addr issued_PC, InstSeqNum issued_seq_num, bool is_store) 254{ 255 // This only is updated upon a store being issued. 256 if (!is_store) { 257 return; 258 } 259 260 int index = calcIndex(issued_PC); 261 262 int store_SSID; 263 264 assert(index < SSITSize); 265 266 SeqNumMapIt store_list_it = storeList.find(issued_seq_num); 267 268 if (store_list_it != storeList.end()) { 269 storeList.erase(store_list_it); 270 } 271 272 // Make sure the SSIT still has a valid entry for the issued store. 273 if (!validSSIT[index]) { 274 return; 275 } 276 277 store_SSID = SSIT[index]; 278 279 assert(store_SSID < LFSTSize); 280 281 // If the last fetched store in the store set refers to the store that 282 // was just issued, then invalidate the entry. 283 if (validLFST[store_SSID] && LFST[store_SSID] == issued_seq_num) { 284 DPRINTF(StoreSet, "StoreSet: store invalidated itself in LFST.\n"); 285 validLFST[store_SSID] = false; 286 } 287} 288 289void 290StoreSet::squash(InstSeqNum squashed_num, ThreadID tid) 291{ 292 DPRINTF(StoreSet, "StoreSet: Squashing until inum %i\n", 293 squashed_num); 294 295 int idx; 296 SeqNumMapIt store_list_it = storeList.begin(); 297 298 //@todo:Fix to only delete from correct thread 299 while (!storeList.empty()) { 300 idx = (*store_list_it).second; 301 302 if ((*store_list_it).first <= squashed_num) { 303 break; 304 } 305 306 bool younger = LFST[idx] > squashed_num; 307 308 if (validLFST[idx] && younger) { 309 DPRINTF(StoreSet, "Squashed [sn:%lli]\n", LFST[idx]); 310 validLFST[idx] = false; 311 312 storeList.erase(store_list_it++); 313 } else if (!validLFST[idx] && younger) { 314 storeList.erase(store_list_it++); 315 } 316 } 317} 318 319void 320StoreSet::clear() 321{ 322 for (int i = 0; i < SSITSize; ++i) { 323 validSSIT[i] = false; 324 } 325 326 for (int i = 0; i < LFSTSize; ++i) { 327 validLFST[i] = false; 328 } 329 330 storeList.clear(); 331} 332 333void 334StoreSet::dump() 335{ 336 cprintf("storeList.size(): %i\n", storeList.size()); 337 SeqNumMapIt store_list_it = storeList.begin(); 338 339 int num = 0; 340 341 while (store_list_it != storeList.end()) { 342 cprintf("%i: [sn:%lli] SSID:%i\n", 343 num, (*store_list_it).first, (*store_list_it).second); 344 num++; 345 store_list_it++; 346 } 347} 348