rename_map.hh (10935:acd48ddd725f) | rename_map.hh (12104:edd63f9c6184) |
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1/* 2 * Copyright (c) 2015 ARM Limited 3 * All rights reserved. 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software --- 54 unchanged lines hidden (view full) --- 63 * Register rename map for a single class of registers (e.g., integer 64 * or floating point). Because the register class is implicitly 65 * determined by the rename map instance being accessed, all 66 * architectural register index parameters and values in this class 67 * are relative (e.g., %fp2 is just index 2). 68 */ 69class SimpleRenameMap 70{ | 1/* 2 * Copyright (c) 2015 ARM Limited 3 * All rights reserved. 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software --- 54 unchanged lines hidden (view full) --- 63 * Register rename map for a single class of registers (e.g., integer 64 * or floating point). Because the register class is implicitly 65 * determined by the rename map instance being accessed, all 66 * architectural register index parameters and values in this class 67 * are relative (e.g., %fp2 is just index 2). 68 */ 69class SimpleRenameMap 70{ |
71 public: 72 73 typedef TheISA::RegIndex RegIndex; 74 | |
75 private: 76 77 /** The acutal arch-to-phys register map */ 78 std::vector<PhysRegIndex> map; 79 80 /** 81 * Pointer to the free list from which new physical registers 82 * should be allocated in rename() --- 64 unchanged lines hidden (view full) --- 147 /** Return the number of free entries on the associated free list. */ 148 unsigned numFreeEntries() const { return freeList->numFreeRegs(); } 149}; 150 151 152/** 153 * Unified register rename map for all classes of registers. Wraps a 154 * set of class-specific rename maps. Methods that do not specify a | 71 private: 72 73 /** The acutal arch-to-phys register map */ 74 std::vector<PhysRegIndex> map; 75 76 /** 77 * Pointer to the free list from which new physical registers 78 * should be allocated in rename() --- 64 unchanged lines hidden (view full) --- 143 /** Return the number of free entries on the associated free list. */ 144 unsigned numFreeEntries() const { return freeList->numFreeRegs(); } 145}; 146 147 148/** 149 * Unified register rename map for all classes of registers. Wraps a 150 * set of class-specific rename maps. Methods that do not specify a |
155 * register class (e.g., rename()) take unified register indices, | 151 * register class (e.g., rename()) take register ids, |
156 * while methods that do specify a register class (e.g., renameInt()) | 152 * while methods that do specify a register class (e.g., renameInt()) |
157 * take relative register indices. See http://gem5.org/Register_Indexing. | 153 * take register indices. |
158 */ 159class UnifiedRenameMap 160{ 161 private: 162 163 /** The integer register rename map */ 164 SimpleRenameMap intMap; 165 --- 8 unchanged lines hidden (view full) --- 174 * proper class. 175 */ 176 PhysRegFile *regFile; 177 178 /** The condition-code register rename map */ 179 SimpleRenameMap ccMap; 180 181 public: | 154 */ 155class UnifiedRenameMap 156{ 157 private: 158 159 /** The integer register rename map */ 160 SimpleRenameMap intMap; 161 --- 8 unchanged lines hidden (view full) --- 170 * proper class. 171 */ 172 PhysRegFile *regFile; 173 174 /** The condition-code register rename map */ 175 SimpleRenameMap ccMap; 176 177 public: |
182 typedef TheISA::RegIndex RegIndex; | |
183 184 typedef SimpleRenameMap::RenameInfo RenameInfo; 185 186 /** Default constructor. init() must be called prior to use. */ 187 UnifiedRenameMap() : regFile(nullptr) {}; 188 189 /** Destructor. */ 190 ~UnifiedRenameMap() {}; 191 192 /** Initializes rename map with given parameters. */ 193 void init(PhysRegFile *_regFile, 194 RegIndex _intZeroReg, 195 RegIndex _floatZeroReg, 196 UnifiedFreeList *freeList); 197 198 /** 199 * Tell rename map to get a new free physical register to remap | 178 179 typedef SimpleRenameMap::RenameInfo RenameInfo; 180 181 /** Default constructor. init() must be called prior to use. */ 182 UnifiedRenameMap() : regFile(nullptr) {}; 183 184 /** Destructor. */ 185 ~UnifiedRenameMap() {}; 186 187 /** Initializes rename map with given parameters. */ 188 void init(PhysRegFile *_regFile, 189 RegIndex _intZeroReg, 190 RegIndex _floatZeroReg, 191 UnifiedFreeList *freeList); 192 193 /** 194 * Tell rename map to get a new free physical register to remap |
200 * the specified architectural register. This version takes a 201 * unified flattened architectural register index and calls the | 195 * the specified architectural register. This version takes a 196 * flattened architectural register id and calls the |
202 * appropriate class-specific rename table. | 197 * appropriate class-specific rename table. |
203 * @param arch_reg The unified architectural register index to remap. | 198 * @param arch_reg The architectural register index to remap. |
204 * @return A RenameInfo pair indicating both the new and previous 205 * physical registers. 206 */ | 199 * @return A RenameInfo pair indicating both the new and previous 200 * physical registers. 201 */ |
207 RenameInfo rename(RegIndex arch_reg); | 202 RenameInfo rename(RegId arch_reg); |
208 209 /** | 203 204 /** |
210 * Perform rename() on an integer register, given a relative | 205 * Perform rename() on an integer register, given a |
211 * integer register index. 212 */ 213 RenameInfo renameInt(RegIndex rel_arch_reg) 214 { 215 RenameInfo info = intMap.rename(rel_arch_reg); 216 assert(regFile->isIntPhysReg(info.first)); 217 return info; 218 } 219 220 /** | 206 * integer register index. 207 */ 208 RenameInfo renameInt(RegIndex rel_arch_reg) 209 { 210 RenameInfo info = intMap.rename(rel_arch_reg); 211 assert(regFile->isIntPhysReg(info.first)); 212 return info; 213 } 214 215 /** |
221 * Perform rename() on a floating-point register, given a relative | 216 * Perform rename() on a floating-point register, given a |
222 * floating-point register index. 223 */ 224 RenameInfo renameFloat(RegIndex rel_arch_reg) 225 { 226 RenameInfo info = floatMap.rename(rel_arch_reg); 227 assert(regFile->isFloatPhysReg(info.first)); 228 return info; 229 } 230 231 /** | 217 * floating-point register index. 218 */ 219 RenameInfo renameFloat(RegIndex rel_arch_reg) 220 { 221 RenameInfo info = floatMap.rename(rel_arch_reg); 222 assert(regFile->isFloatPhysReg(info.first)); 223 return info; 224 } 225 226 /** |
232 * Perform rename() on a condition-code register, given a relative | 227 * Perform rename() on a condition-code register, given a |
233 * condition-code register index. 234 */ 235 RenameInfo renameCC(RegIndex rel_arch_reg) 236 { 237 RenameInfo info = ccMap.rename(rel_arch_reg); 238 assert(regFile->isCCPhysReg(info.first)); 239 return info; 240 } 241 242 /** | 228 * condition-code register index. 229 */ 230 RenameInfo renameCC(RegIndex rel_arch_reg) 231 { 232 RenameInfo info = ccMap.rename(rel_arch_reg); 233 assert(regFile->isCCPhysReg(info.first)); 234 return info; 235 } 236 237 /** |
243 * Perform rename() on a misc register, given a relative | 238 * Perform rename() on a misc register, given a |
244 * misc register index. 245 */ 246 RenameInfo renameMisc(RegIndex rel_arch_reg) 247 { 248 // misc regs aren't really renamed, just remapped 249 PhysRegIndex phys_reg = lookupMisc(rel_arch_reg); 250 // Set the previous register to the same register; mainly it must be 251 // known that the prev reg was outside the range of normal registers 252 // so the free list can avoid adding it. 253 return RenameInfo(phys_reg, phys_reg); 254 } 255 256 257 /** 258 * Look up the physical register mapped to an architectural register. | 239 * misc register index. 240 */ 241 RenameInfo renameMisc(RegIndex rel_arch_reg) 242 { 243 // misc regs aren't really renamed, just remapped 244 PhysRegIndex phys_reg = lookupMisc(rel_arch_reg); 245 // Set the previous register to the same register; mainly it must be 246 // known that the prev reg was outside the range of normal registers 247 // so the free list can avoid adding it. 248 return RenameInfo(phys_reg, phys_reg); 249 } 250 251 252 /** 253 * Look up the physical register mapped to an architectural register. |
259 * This version takes a unified flattened architectural register index | 254 * This version takes a flattened architectural register id |
260 * and calls the appropriate class-specific rename table. | 255 * and calls the appropriate class-specific rename table. |
261 * @param arch_reg The unified architectural register to look up. | 256 * @param arch_reg The architectural register to look up. |
262 * @return The physical register it is currently mapped to. 263 */ | 257 * @return The physical register it is currently mapped to. 258 */ |
264 PhysRegIndex lookup(RegIndex arch_reg) const; | 259 PhysRegIndex lookup(RegId arch_reg) const; |
265 266 /** | 260 261 /** |
267 * Perform lookup() on an integer register, given a relative | 262 * Perform lookup() on an integer register, given a |
268 * integer register index. 269 */ 270 PhysRegIndex lookupInt(RegIndex rel_arch_reg) const 271 { 272 PhysRegIndex phys_reg = intMap.lookup(rel_arch_reg); 273 assert(regFile->isIntPhysReg(phys_reg)); 274 return phys_reg; 275 } 276 277 /** | 263 * integer register index. 264 */ 265 PhysRegIndex lookupInt(RegIndex rel_arch_reg) const 266 { 267 PhysRegIndex phys_reg = intMap.lookup(rel_arch_reg); 268 assert(regFile->isIntPhysReg(phys_reg)); 269 return phys_reg; 270 } 271 272 /** |
278 * Perform lookup() on a floating-point register, given a relative | 273 * Perform lookup() on a floating-point register, given a |
279 * floating-point register index. 280 */ 281 PhysRegIndex lookupFloat(RegIndex rel_arch_reg) const 282 { 283 PhysRegIndex phys_reg = floatMap.lookup(rel_arch_reg); 284 assert(regFile->isFloatPhysReg(phys_reg)); 285 return phys_reg; 286 } 287 288 /** | 274 * floating-point register index. 275 */ 276 PhysRegIndex lookupFloat(RegIndex rel_arch_reg) const 277 { 278 PhysRegIndex phys_reg = floatMap.lookup(rel_arch_reg); 279 assert(regFile->isFloatPhysReg(phys_reg)); 280 return phys_reg; 281 } 282 283 /** |
289 * Perform lookup() on a condition-code register, given a relative | 284 * Perform lookup() on a condition-code register, given a |
290 * condition-code register index. 291 */ 292 PhysRegIndex lookupCC(RegIndex rel_arch_reg) const 293 { 294 PhysRegIndex phys_reg = ccMap.lookup(rel_arch_reg); 295 assert(regFile->isCCPhysReg(phys_reg)); 296 return phys_reg; 297 } --- 8 unchanged lines hidden (view full) --- 306 // beyond the range of actual physical registers 307 PhysRegIndex phys_reg = rel_arch_reg + regFile->totalNumPhysRegs(); 308 return phys_reg; 309 } 310 311 /** 312 * Update rename map with a specific mapping. Generally used to 313 * roll back to old mappings on a squash. This version takes a | 285 * condition-code register index. 286 */ 287 PhysRegIndex lookupCC(RegIndex rel_arch_reg) const 288 { 289 PhysRegIndex phys_reg = ccMap.lookup(rel_arch_reg); 290 assert(regFile->isCCPhysReg(phys_reg)); 291 return phys_reg; 292 } --- 8 unchanged lines hidden (view full) --- 301 // beyond the range of actual physical registers 302 PhysRegIndex phys_reg = rel_arch_reg + regFile->totalNumPhysRegs(); 303 return phys_reg; 304 } 305 306 /** 307 * Update rename map with a specific mapping. Generally used to 308 * roll back to old mappings on a squash. This version takes a |
314 * unified flattened architectural register index and calls the | 309 * flattened architectural register id and calls the |
315 * appropriate class-specific rename table. | 310 * appropriate class-specific rename table. |
316 * @param arch_reg The unified architectural register to remap. | 311 * @param arch_reg The architectural register to remap. |
317 * @param phys_reg The physical register to remap it to. 318 */ | 312 * @param phys_reg The physical register to remap it to. 313 */ |
319 void setEntry(RegIndex arch_reg, PhysRegIndex phys_reg); | 314 void setEntry(RegId arch_reg, PhysRegIndex phys_reg); |
320 321 /** | 315 316 /** |
322 * Perform setEntry() on an integer register, given a relative | 317 * Perform setEntry() on an integer register, given a |
323 * integer register index. 324 */ 325 void setIntEntry(RegIndex arch_reg, PhysRegIndex phys_reg) 326 { 327 assert(regFile->isIntPhysReg(phys_reg)); 328 intMap.setEntry(arch_reg, phys_reg); 329 } 330 331 /** | 318 * integer register index. 319 */ 320 void setIntEntry(RegIndex arch_reg, PhysRegIndex phys_reg) 321 { 322 assert(regFile->isIntPhysReg(phys_reg)); 323 intMap.setEntry(arch_reg, phys_reg); 324 } 325 326 /** |
332 * Perform setEntry() on a floating-point register, given a relative | 327 * Perform setEntry() on a floating-point register, given a |
333 * floating-point register index. 334 */ 335 void setFloatEntry(RegIndex arch_reg, PhysRegIndex phys_reg) 336 { 337 assert(regFile->isFloatPhysReg(phys_reg)); 338 floatMap.setEntry(arch_reg, phys_reg); 339 } 340 341 /** | 328 * floating-point register index. 329 */ 330 void setFloatEntry(RegIndex arch_reg, PhysRegIndex phys_reg) 331 { 332 assert(regFile->isFloatPhysReg(phys_reg)); 333 floatMap.setEntry(arch_reg, phys_reg); 334 } 335 336 /** |
342 * Perform setEntry() on a condition-code register, given a relative | 337 * Perform setEntry() on a condition-code register, given a |
343 * condition-code register index. 344 */ 345 void setCCEntry(RegIndex arch_reg, PhysRegIndex phys_reg) 346 { 347 assert(regFile->isCCPhysReg(phys_reg)); 348 ccMap.setEntry(arch_reg, phys_reg); 349 } 350 --- 24 unchanged lines hidden --- | 338 * condition-code register index. 339 */ 340 void setCCEntry(RegIndex arch_reg, PhysRegIndex phys_reg) 341 { 342 assert(regFile->isCCPhysReg(phys_reg)); 343 ccMap.setEntry(arch_reg, phys_reg); 344 } 345 --- 24 unchanged lines hidden --- |