store_set.cc revision 8519:ef35ce2bd73f
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#include "debug/StoreSet.hh" 36 37StoreSet::StoreSet(uint64_t clear_period, int _SSIT_size, int _LFST_size) 38 : clearPeriod(clear_period), SSITSize(_SSIT_size), LFSTSize(_LFST_size) 39{ 40 DPRINTF(StoreSet, "StoreSet: Creating store set object.\n"); 41 DPRINTF(StoreSet, "StoreSet: SSIT size: %i, LFST size: %i.\n", 42 SSITSize, LFSTSize); 43 44 if (!isPowerOf2(SSITSize)) { 45 fatal("Invalid SSIT size!\n"); 46 } 47 48 SSIT.resize(SSITSize); 49 50 validSSIT.resize(SSITSize); 51 52 for (int i = 0; i < SSITSize; ++i) 53 validSSIT[i] = false; 54 55 if (!isPowerOf2(LFSTSize)) { 56 fatal("Invalid LFST size!\n"); 57 } 58 59 LFST.resize(LFSTSize); 60 61 validLFST.resize(LFSTSize); 62 63 for (int i = 0; i < LFSTSize; ++i) { 64 validLFST[i] = false; 65 LFST[i] = 0; 66 } 67 68 indexMask = SSITSize - 1; 69 70 offsetBits = 2; 71 72 memOpsPred = 0; 73} 74 75StoreSet::~StoreSet() 76{ 77} 78 79void 80StoreSet::init(uint64_t clear_period, int _SSIT_size, int _LFST_size) 81{ 82 SSITSize = _SSIT_size; 83 LFSTSize = _LFST_size; 84 clearPeriod = clear_period; 85 86 DPRINTF(StoreSet, "StoreSet: Creating store set object.\n"); 87 DPRINTF(StoreSet, "StoreSet: SSIT size: %i, LFST size: %i.\n", 88 SSITSize, LFSTSize); 89 90 SSIT.resize(SSITSize); 91 92 validSSIT.resize(SSITSize); 93 94 for (int i = 0; i < SSITSize; ++i) 95 validSSIT[i] = false; 96 97 LFST.resize(LFSTSize); 98 99 validLFST.resize(LFSTSize); 100 101 for (int i = 0; i < LFSTSize; ++i) { 102 validLFST[i] = false; 103 LFST[i] = 0; 104 } 105 106 indexMask = SSITSize - 1; 107 108 offsetBits = 2; 109 110 memOpsPred = 0; 111} 112 113 114void 115StoreSet::violation(Addr store_PC, Addr load_PC) 116{ 117 int load_index = calcIndex(load_PC); 118 int store_index = calcIndex(store_PC); 119 120 assert(load_index < SSITSize && store_index < SSITSize); 121 122 bool valid_load_SSID = validSSIT[load_index]; 123 bool valid_store_SSID = validSSIT[store_index]; 124 125 if (!valid_load_SSID && !valid_store_SSID) { 126 // Calculate a new SSID here. 127 SSID new_set = calcSSID(load_PC); 128 129 validSSIT[load_index] = true; 130 131 SSIT[load_index] = new_set; 132 133 validSSIT[store_index] = true; 134 135 SSIT[store_index] = new_set; 136 137 assert(new_set < LFSTSize); 138 139 DPRINTF(StoreSet, "StoreSet: Neither load nor store had a valid " 140 "storeset, creating a new one: %i for load %#x, store %#x\n", 141 new_set, load_PC, store_PC); 142 } else if (valid_load_SSID && !valid_store_SSID) { 143 SSID load_SSID = SSIT[load_index]; 144 145 validSSIT[store_index] = true; 146 147 SSIT[store_index] = load_SSID; 148 149 assert(load_SSID < LFSTSize); 150 151 DPRINTF(StoreSet, "StoreSet: Load had a valid store set. Adding " 152 "store to that set: %i for load %#x, store %#x\n", 153 load_SSID, load_PC, store_PC); 154 } else if (!valid_load_SSID && valid_store_SSID) { 155 SSID store_SSID = SSIT[store_index]; 156 157 validSSIT[load_index] = true; 158 159 SSIT[load_index] = store_SSID; 160 161 DPRINTF(StoreSet, "StoreSet: Store had a valid store set: %i for " 162 "load %#x, store %#x\n", 163 store_SSID, load_PC, store_PC); 164 } else { 165 SSID load_SSID = SSIT[load_index]; 166 SSID store_SSID = SSIT[store_index]; 167 168 assert(load_SSID < LFSTSize && store_SSID < LFSTSize); 169 170 // The store set with the lower number wins 171 if (store_SSID > load_SSID) { 172 SSIT[store_index] = load_SSID; 173 174 DPRINTF(StoreSet, "StoreSet: Load had smaller store set: %i; " 175 "for load %#x, store %#x\n", 176 load_SSID, load_PC, store_PC); 177 } else { 178 SSIT[load_index] = store_SSID; 179 180 DPRINTF(StoreSet, "StoreSet: Store had smaller store set: %i; " 181 "for load %#x, store %#x\n", 182 store_SSID, load_PC, store_PC); 183 } 184 } 185} 186 187void 188StoreSet::checkClear() 189{ 190 memOpsPred++; 191 if (memOpsPred > clearPeriod) { 192 DPRINTF(StoreSet, "Wiping predictor state beacuse %d ld/st executed\n", 193 clearPeriod); 194 memOpsPred = 0; 195 clear(); 196 } 197} 198 199void 200StoreSet::insertLoad(Addr load_PC, InstSeqNum load_seq_num) 201{ 202 checkClear(); 203 // Does nothing. 204 return; 205} 206 207void 208StoreSet::insertStore(Addr store_PC, InstSeqNum store_seq_num, ThreadID tid) 209{ 210 int index = calcIndex(store_PC); 211 212 int store_SSID; 213 214 checkClear(); 215 assert(index < SSITSize); 216 217 if (!validSSIT[index]) { 218 // Do nothing if there's no valid entry. 219 return; 220 } else { 221 store_SSID = SSIT[index]; 222 223 assert(store_SSID < LFSTSize); 224 225 // Update the last store that was fetched with the current one. 226 LFST[store_SSID] = store_seq_num; 227 228 validLFST[store_SSID] = 1; 229 230 storeList[store_seq_num] = store_SSID; 231 232 DPRINTF(StoreSet, "Store %#x updated the LFST, SSID: %i\n", 233 store_PC, store_SSID); 234 } 235} 236 237InstSeqNum 238StoreSet::checkInst(Addr PC) 239{ 240 int index = calcIndex(PC); 241 242 int inst_SSID; 243 244 assert(index < SSITSize); 245 246 if (!validSSIT[index]) { 247 DPRINTF(StoreSet, "Inst %#x with index %i had no SSID\n", 248 PC, index); 249 250 // Return 0 if there's no valid entry. 251 return 0; 252 } else { 253 inst_SSID = SSIT[index]; 254 255 assert(inst_SSID < LFSTSize); 256 257 if (!validLFST[inst_SSID]) { 258 259 DPRINTF(StoreSet, "Inst %#x with index %i and SSID %i had no " 260 "dependency\n", PC, index, inst_SSID); 261 262 return 0; 263 } else { 264 DPRINTF(StoreSet, "Inst %#x with index %i and SSID %i had LFST " 265 "inum of %i\n", PC, index, inst_SSID, LFST[inst_SSID]); 266 267 return LFST[inst_SSID]; 268 } 269 } 270} 271 272void 273StoreSet::issued(Addr issued_PC, InstSeqNum issued_seq_num, bool is_store) 274{ 275 // This only is updated upon a store being issued. 276 if (!is_store) { 277 return; 278 } 279 280 int index = calcIndex(issued_PC); 281 282 int store_SSID; 283 284 assert(index < SSITSize); 285 286 SeqNumMapIt store_list_it = storeList.find(issued_seq_num); 287 288 if (store_list_it != storeList.end()) { 289 storeList.erase(store_list_it); 290 } 291 292 // Make sure the SSIT still has a valid entry for the issued store. 293 if (!validSSIT[index]) { 294 return; 295 } 296 297 store_SSID = SSIT[index]; 298 299 assert(store_SSID < LFSTSize); 300 301 // If the last fetched store in the store set refers to the store that 302 // was just issued, then invalidate the entry. 303 if (validLFST[store_SSID] && LFST[store_SSID] == issued_seq_num) { 304 DPRINTF(StoreSet, "StoreSet: store invalidated itself in LFST.\n"); 305 validLFST[store_SSID] = false; 306 } 307} 308 309void 310StoreSet::squash(InstSeqNum squashed_num, ThreadID tid) 311{ 312 DPRINTF(StoreSet, "StoreSet: Squashing until inum %i\n", 313 squashed_num); 314 315 int idx; 316 SeqNumMapIt store_list_it = storeList.begin(); 317 318 //@todo:Fix to only delete from correct thread 319 while (!storeList.empty()) { 320 idx = (*store_list_it).second; 321 322 if ((*store_list_it).first <= squashed_num) { 323 break; 324 } 325 326 bool younger = LFST[idx] > squashed_num; 327 328 if (validLFST[idx] && younger) { 329 DPRINTF(StoreSet, "Squashed [sn:%lli]\n", LFST[idx]); 330 validLFST[idx] = false; 331 332 storeList.erase(store_list_it++); 333 } else if (!validLFST[idx] && younger) { 334 storeList.erase(store_list_it++); 335 } 336 } 337} 338 339void 340StoreSet::clear() 341{ 342 for (int i = 0; i < SSITSize; ++i) { 343 validSSIT[i] = false; 344 } 345 346 for (int i = 0; i < LFSTSize; ++i) { 347 validLFST[i] = false; 348 } 349 350 storeList.clear(); 351} 352 353void 354StoreSet::dump() 355{ 356 cprintf("storeList.size(): %i\n", storeList.size()); 357 SeqNumMapIt store_list_it = storeList.begin(); 358 359 int num = 0; 360 361 while (store_list_it != storeList.end()) { 362 cprintf("%i: [sn:%lli] SSID:%i\n", 363 num, (*store_list_it).first, (*store_list_it).second); 364 num++; 365 store_list_it++; 366 } 367} 368