| 1 | /* $NetBSD: rf_nwayxor.c,v 1.11 2006/11/16 01:33:23 christos Exp $ */ |
| 2 | /* |
| 3 | * Copyright (c) 1995 Carnegie-Mellon University. |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Author: Mark Holland, Daniel Stodolsky |
| 7 | * |
| 8 | * Permission to use, copy, modify and distribute this software and |
| 9 | * its documentation is hereby granted, provided that both the copyright |
| 10 | * notice and this permission notice appear in all copies of the |
| 11 | * software, derivative works or modified versions, and any portions |
| 12 | * thereof, and that both notices appear in supporting documentation. |
| 13 | * |
| 14 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" |
| 15 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND |
| 16 | * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. |
| 17 | * |
| 18 | * Carnegie Mellon requests users of this software to return to |
| 19 | * |
| 20 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU |
| 21 | * School of Computer Science |
| 22 | * Carnegie Mellon University |
| 23 | * Pittsburgh PA 15213-3890 |
| 24 | * |
| 25 | * any improvements or extensions that they make and grant Carnegie the |
| 26 | * rights to redistribute these changes. |
| 27 | */ |
| 28 | |
| 29 | /************************************************************ |
| 30 | * |
| 31 | * nwayxor.c -- code to do N-way xors for reconstruction |
| 32 | * |
| 33 | * nWayXorN xors N input buffers into the destination buffer. |
| 34 | * adapted from danner's longword_bxor code. |
| 35 | * |
| 36 | ************************************************************/ |
| 37 | |
| 38 | #include <sys/cdefs.h> |
| 39 | __KERNEL_RCSID(0, "$NetBSD: rf_nwayxor.c,v 1.11 2006/11/16 01:33:23 christos Exp $" ); |
| 40 | |
| 41 | #include "rf_nwayxor.h" |
| 42 | #include "rf_shutdown.h" |
| 43 | |
| 44 | static int callcount[10]; |
| 45 | static void rf_ShutdownNWayXor(void *); |
| 46 | |
| 47 | static void |
| 48 | rf_ShutdownNWayXor(void *ignored) |
| 49 | { |
| 50 | int i; |
| 51 | |
| 52 | if (rf_showXorCallCounts == 0) |
| 53 | return; |
| 54 | printf("Call counts for n-way xor routines: " ); |
| 55 | for (i = 0; i < 10; i++) |
| 56 | printf("%d " , callcount[i]); |
| 57 | printf("\n" ); |
| 58 | } |
| 59 | |
| 60 | int |
| 61 | rf_ConfigureNWayXor(RF_ShutdownList_t **listp) |
| 62 | { |
| 63 | int i; |
| 64 | |
| 65 | for (i = 0; i < 10; i++) |
| 66 | callcount[i] = 0; |
| 67 | rf_ShutdownCreate(listp, rf_ShutdownNWayXor, NULL); |
| 68 | return (0); |
| 69 | } |
| 70 | |
| 71 | void |
| 72 | rf_nWayXor1(RF_ReconBuffer_t **src_rbs, RF_ReconBuffer_t *dest_rb, int len) |
| 73 | { |
| 74 | unsigned long *src = (unsigned long *) src_rbs[0]->buffer; |
| 75 | unsigned long *dest = (unsigned long *) dest_rb->buffer; |
| 76 | unsigned long *end = src + len; |
| 77 | unsigned long d0, d1, d2, d3, s0, s1, s2, s3; |
| 78 | |
| 79 | callcount[1]++; |
| 80 | while (len >= 4) { |
| 81 | d0 = dest[0]; |
| 82 | d1 = dest[1]; |
| 83 | d2 = dest[2]; |
| 84 | d3 = dest[3]; |
| 85 | s0 = src[0]; |
| 86 | s1 = src[1]; |
| 87 | s2 = src[2]; |
| 88 | s3 = src[3]; |
| 89 | dest[0] = d0 ^ s0; |
| 90 | dest[1] = d1 ^ s1; |
| 91 | dest[2] = d2 ^ s2; |
| 92 | dest[3] = d3 ^ s3; |
| 93 | src += 4; |
| 94 | dest += 4; |
| 95 | len -= 4; |
| 96 | } |
| 97 | while (src < end) { |
| 98 | *dest++ ^= *src++; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | void |
| 103 | rf_nWayXor2(RF_ReconBuffer_t **src_rbs, RF_ReconBuffer_t *dest_rb, int len) |
| 104 | { |
| 105 | unsigned long *dst = (unsigned long *) dest_rb->buffer; |
| 106 | unsigned long *a = dst; |
| 107 | unsigned long *b = (unsigned long *) src_rbs[0]->buffer; |
| 108 | unsigned long *c = (unsigned long *) src_rbs[1]->buffer; |
| 109 | unsigned long a0, a1, a2, a3, b0, b1, b2, b3; |
| 110 | |
| 111 | callcount[2]++; |
| 112 | /* align dest to cache line */ |
| 113 | while ((((unsigned long) dst) & 0x1f)) { |
| 114 | *dst++ = *a++ ^ *b++ ^ *c++; |
| 115 | len--; |
| 116 | } |
| 117 | while (len > 4) { |
| 118 | a0 = a[0]; |
| 119 | len -= 4; |
| 120 | |
| 121 | a1 = a[1]; |
| 122 | a2 = a[2]; |
| 123 | |
| 124 | a3 = a[3]; |
| 125 | a += 4; |
| 126 | |
| 127 | b0 = b[0]; |
| 128 | b1 = b[1]; |
| 129 | |
| 130 | b2 = b[2]; |
| 131 | b3 = b[3]; |
| 132 | /* start dual issue */ |
| 133 | a0 ^= b0; |
| 134 | b0 = c[0]; |
| 135 | |
| 136 | b += 4; |
| 137 | a1 ^= b1; |
| 138 | |
| 139 | a2 ^= b2; |
| 140 | a3 ^= b3; |
| 141 | |
| 142 | b1 = c[1]; |
| 143 | a0 ^= b0; |
| 144 | |
| 145 | b2 = c[2]; |
| 146 | a1 ^= b1; |
| 147 | |
| 148 | b3 = c[3]; |
| 149 | a2 ^= b2; |
| 150 | |
| 151 | dst[0] = a0; |
| 152 | a3 ^= b3; |
| 153 | dst[1] = a1; |
| 154 | c += 4; |
| 155 | dst[2] = a2; |
| 156 | dst[3] = a3; |
| 157 | dst += 4; |
| 158 | } |
| 159 | while (len) { |
| 160 | *dst++ = *a++ ^ *b++ ^ *c++; |
| 161 | len--; |
| 162 | } |
| 163 | } |
| 164 | /* note that first arg is not incremented but 2nd arg is */ |
| 165 | #define LOAD_FIRST(_dst,_b) \ |
| 166 | a0 = _dst[0]; len -= 4; \ |
| 167 | a1 = _dst[1]; \ |
| 168 | a2 = _dst[2]; \ |
| 169 | a3 = _dst[3]; \ |
| 170 | b0 = _b[0]; \ |
| 171 | b1 = _b[1]; \ |
| 172 | b2 = _b[2]; \ |
| 173 | b3 = _b[3]; _b += 4; |
| 174 | |
| 175 | /* note: arg is incremented */ |
| 176 | #define XOR_AND_LOAD_NEXT(_n) \ |
| 177 | a0 ^= b0; b0 = _n[0]; \ |
| 178 | a1 ^= b1; b1 = _n[1]; \ |
| 179 | a2 ^= b2; b2 = _n[2]; \ |
| 180 | a3 ^= b3; b3 = _n[3]; \ |
| 181 | _n += 4; |
| 182 | |
| 183 | /* arg is incremented */ |
| 184 | #define XOR_AND_STORE(_dst) \ |
| 185 | a0 ^= b0; _dst[0] = a0; \ |
| 186 | a1 ^= b1; _dst[1] = a1; \ |
| 187 | a2 ^= b2; _dst[2] = a2; \ |
| 188 | a3 ^= b3; _dst[3] = a3; \ |
| 189 | _dst += 4; |
| 190 | |
| 191 | |
| 192 | void |
| 193 | rf_nWayXor3(RF_ReconBuffer_t **src_rbs, RF_ReconBuffer_t *dest_rb, int len) |
| 194 | { |
| 195 | unsigned long *dst = (unsigned long *) dest_rb->buffer; |
| 196 | unsigned long *b = (unsigned long *) src_rbs[0]->buffer; |
| 197 | unsigned long *c = (unsigned long *) src_rbs[1]->buffer; |
| 198 | unsigned long *d = (unsigned long *) src_rbs[2]->buffer; |
| 199 | unsigned long a0, a1, a2, a3, b0, b1, b2, b3; |
| 200 | |
| 201 | callcount[3]++; |
| 202 | /* align dest to cache line */ |
| 203 | while ((((unsigned long) dst) & 0x1f)) { |
| 204 | *dst++ ^= *b++ ^ *c++ ^ *d++; |
| 205 | len--; |
| 206 | } |
| 207 | while (len > 4) { |
| 208 | LOAD_FIRST(dst, b); |
| 209 | XOR_AND_LOAD_NEXT(c); |
| 210 | XOR_AND_LOAD_NEXT(d); |
| 211 | XOR_AND_STORE(dst); |
| 212 | } |
| 213 | while (len) { |
| 214 | *dst++ ^= *b++ ^ *c++ ^ *d++; |
| 215 | len--; |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | void |
| 220 | rf_nWayXor4(RF_ReconBuffer_t **src_rbs, RF_ReconBuffer_t *dest_rb, int len) |
| 221 | { |
| 222 | unsigned long *dst = (unsigned long *) dest_rb->buffer; |
| 223 | unsigned long *b = (unsigned long *) src_rbs[0]->buffer; |
| 224 | unsigned long *c = (unsigned long *) src_rbs[1]->buffer; |
| 225 | unsigned long *d = (unsigned long *) src_rbs[2]->buffer; |
| 226 | unsigned long *e = (unsigned long *) src_rbs[3]->buffer; |
| 227 | unsigned long a0, a1, a2, a3, b0, b1, b2, b3; |
| 228 | |
| 229 | callcount[4]++; |
| 230 | /* align dest to cache line */ |
| 231 | while ((((unsigned long) dst) & 0x1f)) { |
| 232 | *dst++ ^= *b++ ^ *c++ ^ *d++ ^ *e++; |
| 233 | len--; |
| 234 | } |
| 235 | while (len > 4) { |
| 236 | LOAD_FIRST(dst, b); |
| 237 | XOR_AND_LOAD_NEXT(c); |
| 238 | XOR_AND_LOAD_NEXT(d); |
| 239 | XOR_AND_LOAD_NEXT(e); |
| 240 | XOR_AND_STORE(dst); |
| 241 | } |
| 242 | while (len) { |
| 243 | *dst++ ^= *b++ ^ *c++ ^ *d++ ^ *e++; |
| 244 | len--; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | void |
| 249 | rf_nWayXor5(RF_ReconBuffer_t **src_rbs, RF_ReconBuffer_t *dest_rb, int len) |
| 250 | { |
| 251 | unsigned long *dst = (unsigned long *) dest_rb->buffer; |
| 252 | unsigned long *b = (unsigned long *) src_rbs[0]->buffer; |
| 253 | unsigned long *c = (unsigned long *) src_rbs[1]->buffer; |
| 254 | unsigned long *d = (unsigned long *) src_rbs[2]->buffer; |
| 255 | unsigned long *e = (unsigned long *) src_rbs[3]->buffer; |
| 256 | unsigned long *f = (unsigned long *) src_rbs[4]->buffer; |
| 257 | unsigned long a0, a1, a2, a3, b0, b1, b2, b3; |
| 258 | |
| 259 | callcount[5]++; |
| 260 | /* align dest to cache line */ |
| 261 | while ((((unsigned long) dst) & 0x1f)) { |
| 262 | *dst++ ^= *b++ ^ *c++ ^ *d++ ^ *e++ ^ *f++; |
| 263 | len--; |
| 264 | } |
| 265 | while (len > 4) { |
| 266 | LOAD_FIRST(dst, b); |
| 267 | XOR_AND_LOAD_NEXT(c); |
| 268 | XOR_AND_LOAD_NEXT(d); |
| 269 | XOR_AND_LOAD_NEXT(e); |
| 270 | XOR_AND_LOAD_NEXT(f); |
| 271 | XOR_AND_STORE(dst); |
| 272 | } |
| 273 | while (len) { |
| 274 | *dst++ ^= *b++ ^ *c++ ^ *d++ ^ *e++ ^ *f++; |
| 275 | len--; |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | void |
| 280 | rf_nWayXor6(RF_ReconBuffer_t **src_rbs, RF_ReconBuffer_t *dest_rb, int len) |
| 281 | { |
| 282 | unsigned long *dst = (unsigned long *) dest_rb->buffer; |
| 283 | unsigned long *b = (unsigned long *) src_rbs[0]->buffer; |
| 284 | unsigned long *c = (unsigned long *) src_rbs[1]->buffer; |
| 285 | unsigned long *d = (unsigned long *) src_rbs[2]->buffer; |
| 286 | unsigned long *e = (unsigned long *) src_rbs[3]->buffer; |
| 287 | unsigned long *f = (unsigned long *) src_rbs[4]->buffer; |
| 288 | unsigned long *g = (unsigned long *) src_rbs[5]->buffer; |
| 289 | unsigned long a0, a1, a2, a3, b0, b1, b2, b3; |
| 290 | |
| 291 | callcount[6]++; |
| 292 | /* align dest to cache line */ |
| 293 | while ((((unsigned long) dst) & 0x1f)) { |
| 294 | *dst++ ^= *b++ ^ *c++ ^ *d++ ^ *e++ ^ *f++ ^ *g++; |
| 295 | len--; |
| 296 | } |
| 297 | while (len > 4) { |
| 298 | LOAD_FIRST(dst, b); |
| 299 | XOR_AND_LOAD_NEXT(c); |
| 300 | XOR_AND_LOAD_NEXT(d); |
| 301 | XOR_AND_LOAD_NEXT(e); |
| 302 | XOR_AND_LOAD_NEXT(f); |
| 303 | XOR_AND_LOAD_NEXT(g); |
| 304 | XOR_AND_STORE(dst); |
| 305 | } |
| 306 | while (len) { |
| 307 | *dst++ ^= *b++ ^ *c++ ^ *d++ ^ *e++ ^ *f++ ^ *g++; |
| 308 | len--; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | void |
| 313 | rf_nWayXor7(RF_ReconBuffer_t **src_rbs, RF_ReconBuffer_t *dest_rb, int len) |
| 314 | { |
| 315 | unsigned long *dst = (unsigned long *) dest_rb->buffer; |
| 316 | unsigned long *b = (unsigned long *) src_rbs[0]->buffer; |
| 317 | unsigned long *c = (unsigned long *) src_rbs[1]->buffer; |
| 318 | unsigned long *d = (unsigned long *) src_rbs[2]->buffer; |
| 319 | unsigned long *e = (unsigned long *) src_rbs[3]->buffer; |
| 320 | unsigned long *f = (unsigned long *) src_rbs[4]->buffer; |
| 321 | unsigned long *g = (unsigned long *) src_rbs[5]->buffer; |
| 322 | unsigned long *h = (unsigned long *) src_rbs[6]->buffer; |
| 323 | unsigned long a0, a1, a2, a3, b0, b1, b2, b3; |
| 324 | |
| 325 | callcount[7]++; |
| 326 | /* align dest to cache line */ |
| 327 | while ((((unsigned long) dst) & 0x1f)) { |
| 328 | *dst++ ^= *b++ ^ *c++ ^ *d++ ^ *e++ ^ *f++ ^ *g++ ^ *h++; |
| 329 | len--; |
| 330 | } |
| 331 | while (len > 4) { |
| 332 | LOAD_FIRST(dst, b); |
| 333 | XOR_AND_LOAD_NEXT(c); |
| 334 | XOR_AND_LOAD_NEXT(d); |
| 335 | XOR_AND_LOAD_NEXT(e); |
| 336 | XOR_AND_LOAD_NEXT(f); |
| 337 | XOR_AND_LOAD_NEXT(g); |
| 338 | XOR_AND_LOAD_NEXT(h); |
| 339 | XOR_AND_STORE(dst); |
| 340 | } |
| 341 | while (len) { |
| 342 | *dst++ ^= *b++ ^ *c++ ^ *d++ ^ *e++ ^ *f++ ^ *g++ ^ *h++; |
| 343 | len--; |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | void |
| 348 | rf_nWayXor8(RF_ReconBuffer_t **src_rbs, RF_ReconBuffer_t *dest_rb, int len) |
| 349 | { |
| 350 | unsigned long *dst = (unsigned long *) dest_rb->buffer; |
| 351 | unsigned long *b = (unsigned long *) src_rbs[0]->buffer; |
| 352 | unsigned long *c = (unsigned long *) src_rbs[1]->buffer; |
| 353 | unsigned long *d = (unsigned long *) src_rbs[2]->buffer; |
| 354 | unsigned long *e = (unsigned long *) src_rbs[3]->buffer; |
| 355 | unsigned long *f = (unsigned long *) src_rbs[4]->buffer; |
| 356 | unsigned long *g = (unsigned long *) src_rbs[5]->buffer; |
| 357 | unsigned long *h = (unsigned long *) src_rbs[6]->buffer; |
| 358 | unsigned long *i = (unsigned long *) src_rbs[7]->buffer; |
| 359 | unsigned long a0, a1, a2, a3, b0, b1, b2, b3; |
| 360 | |
| 361 | callcount[8]++; |
| 362 | /* align dest to cache line */ |
| 363 | while ((((unsigned long) dst) & 0x1f)) { |
| 364 | *dst++ ^= *b++ ^ *c++ ^ *d++ ^ *e++ ^ *f++ ^ *g++ ^ *h++ ^ *i++; |
| 365 | len--; |
| 366 | } |
| 367 | while (len > 4) { |
| 368 | LOAD_FIRST(dst, b); |
| 369 | XOR_AND_LOAD_NEXT(c); |
| 370 | XOR_AND_LOAD_NEXT(d); |
| 371 | XOR_AND_LOAD_NEXT(e); |
| 372 | XOR_AND_LOAD_NEXT(f); |
| 373 | XOR_AND_LOAD_NEXT(g); |
| 374 | XOR_AND_LOAD_NEXT(h); |
| 375 | XOR_AND_LOAD_NEXT(i); |
| 376 | XOR_AND_STORE(dst); |
| 377 | } |
| 378 | while (len) { |
| 379 | *dst++ ^= *b++ ^ *c++ ^ *d++ ^ *e++ ^ *f++ ^ *g++ ^ *h++ ^ *i++; |
| 380 | len--; |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | |
| 385 | void |
| 386 | rf_nWayXor9(RF_ReconBuffer_t **src_rbs, RF_ReconBuffer_t *dest_rb, int len) |
| 387 | { |
| 388 | unsigned long *dst = (unsigned long *) dest_rb->buffer; |
| 389 | unsigned long *b = (unsigned long *) src_rbs[0]->buffer; |
| 390 | unsigned long *c = (unsigned long *) src_rbs[1]->buffer; |
| 391 | unsigned long *d = (unsigned long *) src_rbs[2]->buffer; |
| 392 | unsigned long *e = (unsigned long *) src_rbs[3]->buffer; |
| 393 | unsigned long *f = (unsigned long *) src_rbs[4]->buffer; |
| 394 | unsigned long *g = (unsigned long *) src_rbs[5]->buffer; |
| 395 | unsigned long *h = (unsigned long *) src_rbs[6]->buffer; |
| 396 | unsigned long *i = (unsigned long *) src_rbs[7]->buffer; |
| 397 | unsigned long *j = (unsigned long *) src_rbs[8]->buffer; |
| 398 | unsigned long a0, a1, a2, a3, b0, b1, b2, b3; |
| 399 | |
| 400 | callcount[9]++; |
| 401 | /* align dest to cache line */ |
| 402 | while ((((unsigned long) dst) & 0x1f)) { |
| 403 | *dst++ ^= *b++ ^ *c++ ^ *d++ ^ *e++ ^ *f++ ^ *g++ ^ *h++ ^ *i++ ^ *j++; |
| 404 | len--; |
| 405 | } |
| 406 | while (len > 4) { |
| 407 | LOAD_FIRST(dst, b); |
| 408 | XOR_AND_LOAD_NEXT(c); |
| 409 | XOR_AND_LOAD_NEXT(d); |
| 410 | XOR_AND_LOAD_NEXT(e); |
| 411 | XOR_AND_LOAD_NEXT(f); |
| 412 | XOR_AND_LOAD_NEXT(g); |
| 413 | XOR_AND_LOAD_NEXT(h); |
| 414 | XOR_AND_LOAD_NEXT(i); |
| 415 | XOR_AND_LOAD_NEXT(j); |
| 416 | XOR_AND_STORE(dst); |
| 417 | } |
| 418 | while (len) { |
| 419 | *dst++ ^= *b++ ^ *c++ ^ *d++ ^ *e++ ^ *f++ ^ *g++ ^ *h++ ^ *i++ ^ *j++; |
| 420 | len--; |
| 421 | } |
| 422 | } |
| 423 | |