store_set.cc revision 8232:b28d06a175be
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(int _SSIT_size, int _LFST_size) 38 : 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 73StoreSet::~StoreSet() 74{ 75} 76 77void 78StoreSet::init(int _SSIT_size, int _LFST_size) 79{ 80 SSITSize = _SSIT_size; 81 LFSTSize = _LFST_size; 82 83 DPRINTF(StoreSet, "StoreSet: Creating store set object.\n"); 84 DPRINTF(StoreSet, "StoreSet: SSIT size: %i, LFST size: %i.\n", 85 SSITSize, LFSTSize); 86 87 SSIT.resize(SSITSize); 88 89 validSSIT.resize(SSITSize); 90 91 for (int i = 0; i < SSITSize; ++i) 92 validSSIT[i] = false; 93 94 LFST.resize(LFSTSize); 95 96 validLFST.resize(LFSTSize); 97 98 for (int i = 0; i < LFSTSize; ++i) { 99 validLFST[i] = false; 100 LFST[i] = 0; 101 } 102 103 indexMask = SSITSize - 1; 104 105 offsetBits = 2; 106} 107 108 109void 110StoreSet::violation(Addr store_PC, Addr load_PC) 111{ 112 int load_index = calcIndex(load_PC); 113 int store_index = calcIndex(store_PC); 114 115 assert(load_index < SSITSize && store_index < SSITSize); 116 117 bool valid_load_SSID = validSSIT[load_index]; 118 bool valid_store_SSID = validSSIT[store_index]; 119 120 if (!valid_load_SSID && !valid_store_SSID) { 121 // Calculate a new SSID here. 122 SSID new_set = calcSSID(load_PC); 123 124 validSSIT[load_index] = true; 125 126 SSIT[load_index] = new_set; 127 128 validSSIT[store_index] = true; 129 130 SSIT[store_index] = new_set; 131 132 assert(new_set < LFSTSize); 133 134 DPRINTF(StoreSet, "StoreSet: Neither load nor store had a valid " 135 "storeset, creating a new one: %i for load %#x, store %#x\n", 136 new_set, load_PC, store_PC); 137 } else if (valid_load_SSID && !valid_store_SSID) { 138 SSID load_SSID = SSIT[load_index]; 139 140 validSSIT[store_index] = true; 141 142 SSIT[store_index] = load_SSID; 143 144 assert(load_SSID < LFSTSize); 145 146 DPRINTF(StoreSet, "StoreSet: Load had a valid store set. Adding " 147 "store to that set: %i for load %#x, store %#x\n", 148 load_SSID, load_PC, store_PC); 149 } else if (!valid_load_SSID && valid_store_SSID) { 150 SSID store_SSID = SSIT[store_index]; 151 152 validSSIT[load_index] = true; 153 154 SSIT[load_index] = store_SSID; 155 156 DPRINTF(StoreSet, "StoreSet: Store had a valid store set: %i for " 157 "load %#x, store %#x\n", 158 store_SSID, load_PC, store_PC); 159 } else { 160 SSID load_SSID = SSIT[load_index]; 161 SSID store_SSID = SSIT[store_index]; 162 163 assert(load_SSID < LFSTSize && store_SSID < LFSTSize); 164 165 // The store set with the lower number wins 166 if (store_SSID > load_SSID) { 167 SSIT[store_index] = load_SSID; 168 169 DPRINTF(StoreSet, "StoreSet: Load had smaller store set: %i; " 170 "for load %#x, store %#x\n", 171 load_SSID, load_PC, store_PC); 172 } else { 173 SSIT[load_index] = store_SSID; 174 175 DPRINTF(StoreSet, "StoreSet: Store had smaller store set: %i; " 176 "for load %#x, store %#x\n", 177 store_SSID, load_PC, store_PC); 178 } 179 } 180} 181 182void 183StoreSet::insertLoad(Addr load_PC, InstSeqNum load_seq_num) 184{ 185 // Does nothing. 186 return; 187} 188 189void 190StoreSet::insertStore(Addr store_PC, InstSeqNum store_seq_num, ThreadID tid) 191{ 192 int index = calcIndex(store_PC); 193 194 int store_SSID; 195 196 assert(index < SSITSize); 197 198 if (!validSSIT[index]) { 199 // Do nothing if there's no valid entry. 200 return; 201 } else { 202 store_SSID = SSIT[index]; 203 204 assert(store_SSID < LFSTSize); 205 206 // Update the last store that was fetched with the current one. 207 LFST[store_SSID] = store_seq_num; 208 209 validLFST[store_SSID] = 1; 210 211 storeList[store_seq_num] = store_SSID; 212 213 DPRINTF(StoreSet, "Store %#x updated the LFST, SSID: %i\n", 214 store_PC, store_SSID); 215 } 216} 217 218InstSeqNum 219StoreSet::checkInst(Addr PC) 220{ 221 int index = calcIndex(PC); 222 223 int inst_SSID; 224 225 assert(index < SSITSize); 226 227 if (!validSSIT[index]) { 228 DPRINTF(StoreSet, "Inst %#x with index %i had no SSID\n", 229 PC, index); 230 231 // Return 0 if there's no valid entry. 232 return 0; 233 } else { 234 inst_SSID = SSIT[index]; 235 236 assert(inst_SSID < LFSTSize); 237 238 if (!validLFST[inst_SSID]) { 239 240 DPRINTF(StoreSet, "Inst %#x with index %i and SSID %i had no " 241 "dependency\n", PC, index, inst_SSID); 242 243 return 0; 244 } else { 245 DPRINTF(StoreSet, "Inst %#x with index %i and SSID %i had LFST " 246 "inum of %i\n", PC, index, inst_SSID, LFST[inst_SSID]); 247 248 return LFST[inst_SSID]; 249 } 250 } 251} 252 253void 254StoreSet::issued(Addr issued_PC, InstSeqNum issued_seq_num, bool is_store) 255{ 256 // This only is updated upon a store being issued. 257 if (!is_store) { 258 return; 259 } 260 261 int index = calcIndex(issued_PC); 262 263 int store_SSID; 264 265 assert(index < SSITSize); 266 267 SeqNumMapIt store_list_it = storeList.find(issued_seq_num); 268 269 if (store_list_it != storeList.end()) { 270 storeList.erase(store_list_it); 271 } 272 273 // Make sure the SSIT still has a valid entry for the issued store. 274 if (!validSSIT[index]) { 275 return; 276 } 277 278 store_SSID = SSIT[index]; 279 280 assert(store_SSID < LFSTSize); 281 282 // If the last fetched store in the store set refers to the store that 283 // was just issued, then invalidate the entry. 284 if (validLFST[store_SSID] && LFST[store_SSID] == issued_seq_num) { 285 DPRINTF(StoreSet, "StoreSet: store invalidated itself in LFST.\n"); 286 validLFST[store_SSID] = false; 287 } 288} 289 290void 291StoreSet::squash(InstSeqNum squashed_num, ThreadID tid) 292{ 293 DPRINTF(StoreSet, "StoreSet: Squashing until inum %i\n", 294 squashed_num); 295 296 int idx; 297 SeqNumMapIt store_list_it = storeList.begin(); 298 299 //@todo:Fix to only delete from correct thread 300 while (!storeList.empty()) { 301 idx = (*store_list_it).second; 302 303 if ((*store_list_it).first <= squashed_num) { 304 break; 305 } 306 307 bool younger = LFST[idx] > squashed_num; 308 309 if (validLFST[idx] && younger) { 310 DPRINTF(StoreSet, "Squashed [sn:%lli]\n", LFST[idx]); 311 validLFST[idx] = false; 312 313 storeList.erase(store_list_it++); 314 } else if (!validLFST[idx] && younger) { 315 storeList.erase(store_list_it++); 316 } 317 } 318} 319 320void 321StoreSet::clear() 322{ 323 for (int i = 0; i < SSITSize; ++i) { 324 validSSIT[i] = false; 325 } 326 327 for (int i = 0; i < LFSTSize; ++i) { 328 validLFST[i] = false; 329 } 330 331 storeList.clear(); 332} 333 334void 335StoreSet::dump() 336{ 337 cprintf("storeList.size(): %i\n", storeList.size()); 338 SeqNumMapIt store_list_it = storeList.begin(); 339 340 int num = 0; 341 342 while (store_list_it != storeList.end()) { 343 cprintf("%i: [sn:%lli] SSID:%i\n", 344 num, (*store_list_it).first, (*store_list_it).second); 345 num++; 346 store_list_it++; 347 } 348} 349