1 #include <petscsys.h> /*I "petscsys.h" I*/ 2 #include <petsc/private/petscimpl.h> 3 4 PETSC_STATIC_INLINE int Compare_PetscMPIInt_Private(const void *left, const void *right, PETSC_UNUSED void *ctx) 5 { 6 PetscMPIInt l = *(PetscMPIInt *) left, r = *(PetscMPIInt *) right; 7 return (l < r) ? -1 : (l > r); 8 } 9 10 PETSC_STATIC_INLINE int Compare_PetscInt_Private(const void *left, const void *right, PETSC_UNUSED void *ctx) 11 { 12 PetscInt l = *(PetscInt *) left, r = *(PetscInt *) right; 13 return (l < r) ? -1 : (l > r); 14 } 15 16 PETSC_STATIC_INLINE int Compare_PetscReal_Private(const void *left, const void *right, PETSC_UNUSED void *ctx) 17 { 18 PetscReal l = *(PetscReal *) left, r = *(PetscReal *) right; 19 return (l < r) ? -1 : (l > r); 20 } 21 22 #define MIN_GALLOP_CONST_GLOBAL 8 23 static PetscInt MIN_GALLOP_GLOBAL = MIN_GALLOP_CONST_GLOBAL; 24 typedef int (*CompFunc)(const void *, const void *, void *); 25 26 /* Mostly to force clang uses the builtins, but can't hurt to have gcc compilers also do the same */ 27 #if !defined (PETSC_USE_DEBUG) && defined(__GNUC__) 28 PETSC_STATIC_INLINE void COPYSWAPPY(char *a, char *b, char *t, size_t size) 29 { 30 __builtin_memcpy(t, b, size); 31 __builtin_memmove(b, a, size); 32 __builtin_memcpy(a, t, size); 33 return; 34 } 35 36 PETSC_STATIC_INLINE void COPYSWAPPY2(char *al, char *ar, size_t asize, char *bl, char *br, size_t bsize, char *t) 37 { 38 __builtin_memcpy(t, ar, asize); 39 __builtin_memmove(ar, al, asize); 40 __builtin_memcpy(al, t, asize); 41 __builtin_memcpy(t, br, bsize); 42 __builtin_memmove(br, bl, bsize); 43 __builtin_memcpy(bl, t, bsize); 44 return; 45 } 46 47 PETSC_STATIC_INLINE void Petsc_memcpy(char *dest, const char *src, size_t size) 48 { 49 __builtin_memcpy(dest, src, size); 50 return; 51 } 52 53 PETSC_STATIC_INLINE void Petsc_memcpy2(char *adest, const char *asrc, size_t asize, char *bdest, const char *bsrc, size_t bsize) 54 { 55 __builtin_memcpy(adest, asrc, asize); 56 __builtin_memcpy(bdest, bsrc, bsize); 57 return; 58 } 59 60 PETSC_STATIC_INLINE void Petsc_memmove(char *dest, const char *src, size_t size) 61 { 62 __builtin_memmove(dest, src, size); 63 return; 64 } 65 66 PETSC_STATIC_INLINE void Petsc_memmove2(char *adest, const char *asrc, size_t asize, char *bdest, const char *bsrc, size_t bsize) 67 { 68 __builtin_memmove(adest, asrc, asize); 69 __builtin_memmove(bdest, bsrc, bsize); 70 return; 71 } 72 # else 73 PETSC_STATIC_INLINE void COPYSWAPPY(char *a, char *b, char *t, size_t size) 74 { 75 PetscErrorCode ierr; 76 PetscFunctionBegin; 77 ierr = PetscMemcpy(t, b, size);CHKERRABORT(PETSC_COMM_SELF,ierr); 78 ierr = PetscMemmove(b, a, size);CHKERRABORT(PETSC_COMM_SELF,ierr); 79 ierr = PetscMemcpy(a, t, size);CHKERRABORT(PETSC_COMM_SELF,ierr); 80 PetscFunctionReturnVoid(); 81 } 82 83 PETSC_STATIC_INLINE void COPYSWAPPY2(char *al, char *ar, size_t asize, char *bl, char *br, size_t bsize, char *t) 84 { 85 PetscErrorCode ierr; 86 PetscFunctionBegin; 87 ierr = PetscMemcpy(t, ar, asize);CHKERRABORT(PETSC_COMM_SELF,ierr); 88 ierr = PetscMemmove(ar, al, asize);CHKERRABORT(PETSC_COMM_SELF,ierr); 89 ierr = PetscMemcpy(al, t, asize);CHKERRABORT(PETSC_COMM_SELF,ierr); 90 ierr = PetscMemcpy(t, br, bsize);CHKERRABORT(PETSC_COMM_SELF,ierr); 91 ierr = PetscMemmove(br, bl, bsize);CHKERRABORT(PETSC_COMM_SELF,ierr); 92 ierr = PetscMemcpy(bl, t, bsize);CHKERRABORT(PETSC_COMM_SELF,ierr); 93 PetscFunctionReturnVoid(); 94 } 95 96 PETSC_STATIC_INLINE void Petsc_memcpy(char *dest, const char *src, size_t size) 97 { 98 PetscErrorCode ierr; 99 PetscFunctionBegin; 100 ierr = PetscMemcpy(dest, src, size);CHKERRABORT(PETSC_COMM_SELF,ierr); 101 PetscFunctionReturnVoid(); 102 } 103 104 PETSC_STATIC_INLINE void Petsc_memcpy2(char *adest, const char *asrc, size_t asize, char *bdest, const char *bsrc, size_t bsize) 105 { 106 PetscErrorCode ierr; 107 PetscFunctionBegin; 108 ierr = PetscMemcpy(adest, asrc, asize);CHKERRABORT(PETSC_COMM_SELF,ierr); 109 ierr = PetscMemcpy(bdest, bsrc, bsize);CHKERRABORT(PETSC_COMM_SELF,ierr); 110 PetscFunctionReturnVoid(); 111 } 112 113 PETSC_STATIC_INLINE void Petsc_memmove(char *dest, const char *src, size_t size) 114 { 115 PetscErrorCode ierr; 116 PetscFunctionBegin; 117 ierr = PetscMemmove(dest, src, size);CHKERRABORT(PETSC_COMM_SELF,ierr); 118 PetscFunctionReturnVoid(); 119 } 120 121 PETSC_STATIC_INLINE void Petsc_memmove2(char *adest, const char *asrc, size_t asize, char *bdest, const char *bsrc, size_t bsize) 122 { 123 PetscErrorCode ierr; 124 PetscFunctionBegin; 125 ierr = PetscMemmove(adest, asrc, asize);CHKERRABORT(PETSC_COMM_SELF,ierr); 126 ierr = PetscMemmove(bdest, bsrc, bsize);CHKERRABORT(PETSC_COMM_SELF,ierr); 127 PetscFunctionReturnVoid(); 128 } 129 #endif 130 131 /* Start left look right. Looking for e.g. B[0] in A or mergelo. l inclusive, r inclusive. Returns first m such that arr[m] > 132 x. Output also inclusive. 133 134 NOTE: Both gallopsearch functions CANNOT distinguish between inserting AFTER the entire array vs inserting at entry n!! For example for an array: 135 136 {0,1,2,3,4,5} 137 138 when looking to insert "5" this routine will return *m = 6, but when looking to insert "6" it will ALSO return *m = 6. 139 */ 140 PETSC_STATIC_INLINE PetscErrorCode PetscGallopSearchLeft_Private(const char *arr, size_t size, CompFunc cmp, void *ctx, PetscInt l, PetscInt r, const char *x, PetscInt *m) 141 { 142 PetscInt last = l, k = 1, mid, cur = l+1; 143 144 PetscFunctionBegin; 145 *m = l; 146 if (PetscUnlikelyDebug(r < l)) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_PLIB,"r %D < l %D in PetscGallopSearchLeft",r,l); 147 if ((*cmp)(x, arr+r*size, ctx) >= 0) {*m = r; PetscFunctionReturn(0);} 148 if ((*cmp)(x, (arr)+l*size, ctx) < 0 || PetscUnlikely(!(r-l))) PetscFunctionReturn(0); 149 while (PETSC_TRUE) { 150 if (PetscUnlikely(cur > r)) {cur = r; break;} 151 if ((*cmp)(x, (arr)+cur*size, ctx) < 0) break; 152 last = cur; 153 cur += (k <<= 1) + 1; 154 ++k; 155 } 156 /* standard binary search but take last 0 mid 0 cur 1 into account*/ 157 while (cur > last + 1) { 158 mid = last + ((cur - last) >> 1); 159 if ((*cmp)(x, (arr)+mid*size, ctx) < 0) { 160 cur = mid; 161 } else { 162 last = mid; 163 } 164 } 165 *m = cur; 166 PetscFunctionReturn(0); 167 } 168 169 /* Start right look left. Looking for e.g. A[-1] in B or mergehi. l inclusive, r inclusive. Returns last m such that arr[m] 170 < x. Output also inclusive */ 171 PETSC_STATIC_INLINE PetscErrorCode PetscGallopSearchRight_Private(const char *arr, size_t size, CompFunc cmp, void *ctx, PetscInt l, PetscInt r, const char *x, PetscInt *m) 172 { 173 PetscInt last = r, k = 1, mid, cur = r-1; 174 175 PetscFunctionBegin; 176 *m = r; 177 if (PetscUnlikelyDebug(r < l)) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_PLIB,"r %D < l %D in PetscGallopSearchRight",r,l); 178 if ((*cmp)(x, arr+l*size, ctx) <= 0) {*m = l; PetscFunctionReturn(0);} 179 if ((*cmp)(x, (arr)+r*size, ctx) > 0 || PetscUnlikely(!(r-l))) PetscFunctionReturn(0); 180 while (PETSC_TRUE) { 181 if (PetscUnlikely(cur < l)) {cur = l; break;} 182 if ((*cmp)(x, (arr)+cur*size, ctx) > 0) break; 183 last = cur; 184 cur -= (k <<= 1) + 1; 185 ++k; 186 } 187 /* standard binary search but take last r-1 mid r-1 cur r-2 into account*/ 188 while (last > cur + 1) { 189 mid = last - ((last - cur) >> 1); 190 if ((*cmp)(x, (arr)+mid*size, ctx) > 0) { 191 cur = mid; 192 } else { 193 last = mid; 194 } 195 } 196 *m = cur; 197 PetscFunctionReturn(0); 198 } 199 200 /* Mergesort where size of left half <= size of right half, so mergesort is done left to right. Arr should be pointer to 201 complete array, left is first index of left array, mid is first index of right array, right is last index of right 202 array */ 203 PETSC_STATIC_INLINE PetscErrorCode PetscTimSortMergeLo_Private(char *arr, char *tarr, size_t size, CompFunc cmp, void *ctx, PetscInt left, PetscInt mid, PetscInt right) 204 { 205 PetscInt i = 0, j = mid, k = left, gallopleft = 0, gallopright = 0; 206 const PetscInt llen = mid-left; 207 PetscErrorCode ierr; 208 209 PetscFunctionBegin; 210 Petsc_memcpy(tarr, arr+(left*size), llen*size); 211 while ((i < llen) && (j <= right)) { 212 if ((*cmp)(tarr+(i*size), arr+(j*size), ctx) < 0) { 213 Petsc_memcpy(arr+(k*size), tarr+(i*size), size); 214 ++k; 215 gallopright = 0; 216 if (++i < llen && ++gallopleft >= MIN_GALLOP_GLOBAL) { 217 PetscInt l1, l2, diff1, diff2; 218 do { 219 if (MIN_GALLOP_GLOBAL > 1) --MIN_GALLOP_GLOBAL; 220 /* search temp for right[j], can move up to that of temp into arr immediately */ 221 ierr = PetscGallopSearchLeft_Private(tarr, size, cmp, ctx, i, llen-1, arr+(j*size), &l1);CHKERRQ(ierr); 222 diff1 = l1-i; 223 Petsc_memcpy(arr+(k*size), tarr+(i*size), diff1*size); 224 k += diff1; 225 i = l1; 226 /* search right for temp[i], can move up to that many of right into arr */ 227 ierr = PetscGallopSearchLeft_Private(arr, size, cmp, ctx, j, right, tarr+(i*size), &l2);CHKERRQ(ierr); 228 diff2 = l2-j; 229 Petsc_memmove((arr)+k*size, (arr)+j*size, diff2*size); 230 k += diff2; 231 j = l2; 232 if (i >= llen || j > right) break; 233 } while (diff1 > MIN_GALLOP_GLOBAL || diff2 > MIN_GALLOP_GLOBAL); 234 ++MIN_GALLOP_GLOBAL; 235 } 236 } else { 237 Petsc_memmove(arr+(k*size), arr+(j*size), size); 238 ++k; 239 gallopleft = 0; 240 if (++j <= right && ++gallopright >= MIN_GALLOP_GLOBAL) { 241 PetscInt l1, l2, diff1, diff2; 242 do { 243 if (MIN_GALLOP_GLOBAL > 1) --MIN_GALLOP_GLOBAL; 244 /* search right for temp[i], can move up to that many of right into arr */ 245 ierr = PetscGallopSearchLeft_Private(arr, size, cmp, ctx, j, right, tarr+(i*size), &l2);CHKERRQ(ierr); 246 diff2 = l2-j; 247 Petsc_memmove(arr+(k*size), arr+(j*size), diff2*size); 248 k += diff2; 249 j = l2; 250 /* search temp for right[j], can copy up to that of temp into arr immediately */ 251 ierr = PetscGallopSearchLeft_Private(tarr, size, cmp, ctx, i, llen-1, arr+(j*size), &l1);CHKERRQ(ierr); 252 diff1 = l1-i; 253 Petsc_memcpy(arr+(k*size), tarr+(i*size), diff1*size); 254 k += diff1; 255 i = l1; 256 if (i >= llen || j > right) break; 257 } while (diff1 > MIN_GALLOP_GLOBAL || diff2 > MIN_GALLOP_GLOBAL); 258 ++MIN_GALLOP_GLOBAL; 259 } 260 } 261 } 262 if (i<llen) {Petsc_memcpy(arr+(k*size), tarr+(i*size), (llen-i)*size);} 263 PetscFunctionReturn(0); 264 } 265 266 PETSC_STATIC_INLINE PetscErrorCode PetscTimSortMergeLoWithArray_Private(char *arr, char *atarr, size_t asize, char *barr, char *btarr, size_t bsize, CompFunc cmp, void *ctx, PetscInt left, PetscInt mid, PetscInt right) 267 { 268 PetscInt i = 0, j = mid, k = left, gallopleft = 0, gallopright = 0; 269 const PetscInt llen = mid-left; 270 PetscErrorCode ierr; 271 272 PetscFunctionBegin; 273 Petsc_memcpy2(atarr, arr+(left*asize), llen*asize, btarr, barr+(left*bsize), llen*bsize); 274 while ((i < llen) && (j <= right)) { 275 if ((*cmp)(atarr+(i*asize), arr+(j*asize), ctx) < 0) { 276 Petsc_memcpy2(arr+(k*asize), atarr+(i*asize), asize, barr+(k*bsize), btarr+(i*bsize), bsize); 277 ++k; 278 gallopright = 0; 279 if (++i < llen && ++gallopleft >= MIN_GALLOP_GLOBAL) { 280 PetscInt l1, l2, diff1, diff2; 281 do { 282 if (MIN_GALLOP_GLOBAL > 1) --MIN_GALLOP_GLOBAL; 283 /* search temp for right[j], can move up to that of temp into arr immediately */ 284 ierr = PetscGallopSearchLeft_Private(atarr, asize, cmp, ctx, i, llen-1, arr+(j*asize), &l1);CHKERRQ(ierr); 285 diff1 = l1-i; 286 Petsc_memcpy2(arr+(k*asize), atarr+(i*asize), diff1*asize, barr+(k*bsize), btarr+(i*bsize), diff1*bsize); 287 k += diff1; 288 i = l1; 289 /* search right for temp[i], can move up to that many of right into arr */ 290 ierr = PetscGallopSearchLeft_Private(arr, asize, cmp, ctx, j, right, atarr+(i*asize), &l2);CHKERRQ(ierr); 291 diff2 = l2-j; 292 Petsc_memmove2(arr+(k*asize), arr+(j*asize), diff2*asize, barr+(k*bsize), barr+(j*bsize), diff2*bsize); 293 k += diff2; 294 j = l2; 295 if (i >= llen || j > right) break; 296 } while (diff1 > MIN_GALLOP_GLOBAL || diff2 > MIN_GALLOP_GLOBAL); 297 ++MIN_GALLOP_GLOBAL; 298 } 299 } else { 300 Petsc_memmove2(arr+(k*asize), arr+(j*asize), asize, barr+(k*bsize), barr+(j*bsize), bsize); 301 ++k; 302 gallopleft = 0; 303 if (++j <= right && ++gallopright >= MIN_GALLOP_GLOBAL) { 304 PetscInt l1, l2, diff1, diff2; 305 do { 306 if (MIN_GALLOP_GLOBAL > 1) --MIN_GALLOP_GLOBAL; 307 /* search right for temp[i], can move up to that many of right into arr */ 308 ierr = PetscGallopSearchLeft_Private(arr, asize, cmp, ctx, j, right, atarr+(i*asize), &l2);CHKERRQ(ierr); 309 diff2 = l2-j; 310 Petsc_memmove2(arr+(k*asize), arr+(j*asize), diff2*asize, barr+(k*bsize), barr+(j*bsize), diff2*bsize); 311 k += diff2; 312 j = l2; 313 /* search temp for right[j], can copy up to that of temp into arr immediately */ 314 ierr = PetscGallopSearchLeft_Private(atarr, asize, cmp, ctx, i, llen-1, arr+(j*asize), &l1);CHKERRQ(ierr); 315 diff1 = l1-i; 316 Petsc_memcpy2(arr+(k*asize), atarr+(i*asize), diff1*asize, barr+(k*bsize), btarr+(i*bsize), diff1*bsize); 317 k += diff1; 318 i = l1; 319 if (i >= llen || j > right) break; 320 } while (diff1 > MIN_GALLOP_GLOBAL || diff2 > MIN_GALLOP_GLOBAL); 321 ++MIN_GALLOP_GLOBAL; 322 } 323 } 324 } 325 if (i<llen) {Petsc_memcpy2(arr+(k*asize), atarr+(i*asize), (llen-i)*asize, barr+(k*bsize), btarr+(i*bsize), (llen-i)*bsize);} 326 PetscFunctionReturn(0); 327 } 328 329 /* Mergesort where size of right half < size of left half, so mergesort is done right to left. Arr should be pointer to 330 complete array, left is first index of left array, mid is first index of right array, right is last index of right 331 array */ 332 PETSC_STATIC_INLINE PetscErrorCode PetscTimSortMergeHi_Private(char *arr, char *tarr, size_t size, CompFunc cmp, void *ctx, PetscInt left, PetscInt mid, PetscInt right) 333 { 334 PetscInt i = right-mid, j = mid-1, k = right, gallopleft = 0, gallopright = 0; 335 const PetscInt rlen = right-mid+1; 336 PetscErrorCode ierr; 337 338 PetscFunctionBegin; 339 Petsc_memcpy(tarr, (arr)+mid*size, rlen*size); 340 while ((i >= 0) && (j >= left)) { 341 if ((*cmp)((tarr)+i*size, (arr)+j*size, ctx) > 0) { 342 Petsc_memcpy((arr)+k*size, (tarr)+i*size, size); 343 --k; 344 gallopleft = 0; 345 if (--i >= 0 && ++gallopright >= MIN_GALLOP_GLOBAL) { 346 PetscInt l1, l2, diff1, diff2; 347 do { 348 if (MIN_GALLOP_GLOBAL > 1) --MIN_GALLOP_GLOBAL; 349 /* search temp for left[j], can copy up to that many of temp into arr */ 350 ierr = PetscGallopSearchRight_Private(tarr, size, cmp, ctx, 0, i, (arr)+j*size, &l1);CHKERRQ(ierr); 351 diff1 = i-l1; 352 Petsc_memcpy((arr)+(k-diff1+1)*size, (tarr)+(l1+1)*size, diff1*size); 353 k -= diff1; 354 i = l1; 355 /* search left for temp[i], can move up to that many of left up arr */ 356 ierr = PetscGallopSearchRight_Private(arr, size, cmp, ctx, left, j, (tarr)+i*size, &l2);CHKERRQ(ierr); 357 diff2 = j-l2; 358 Petsc_memmove((arr)+(k-diff2+1)*size, (arr)+(l2+1)*size, diff2*size); 359 k -= diff2; 360 j = l2; 361 if (i < 0 || j < left) break; 362 } while (diff1 > MIN_GALLOP_GLOBAL || diff2 > MIN_GALLOP_GLOBAL); 363 ++MIN_GALLOP_GLOBAL; 364 } 365 } else { 366 Petsc_memmove((arr)+k*size, (arr)+j*size, size); 367 --k; 368 gallopright = 0; 369 if (--j >= left && ++gallopleft >= MIN_GALLOP_GLOBAL) { 370 PetscInt l1, l2, diff1, diff2; 371 do { 372 if (MIN_GALLOP_GLOBAL > 1) --MIN_GALLOP_GLOBAL; 373 /* search left for temp[i], can move up to that many of left up arr */ 374 ierr = PetscGallopSearchRight_Private(arr, size, cmp, ctx, left, j, (tarr)+i*size, &l2);CHKERRQ(ierr); 375 diff2 = j-l2; 376 Petsc_memmove((arr)+(k-diff2+1)*size, (arr)+(l2+1)*size, diff2*size); 377 k -= diff2; 378 j = l2; 379 /* search temp for left[j], can copy up to that many of temp into arr */ 380 ierr = PetscGallopSearchRight_Private(tarr, size, cmp, ctx, 0, i, (arr)+j*size, &l1);CHKERRQ(ierr); 381 diff1 = i-l1; 382 Petsc_memcpy((arr)+(k-diff1+1)*size, (tarr)+(l1+1)*size, diff1*size); 383 k -= diff1; 384 i = l1; 385 if (i < 0 || j < left) break; 386 } while (diff1 > MIN_GALLOP_GLOBAL || diff2 > MIN_GALLOP_GLOBAL); 387 ++MIN_GALLOP_GLOBAL; 388 } 389 } 390 } 391 if (i >= 0) {Petsc_memcpy((arr)+left*size, tarr, (i+1)*size);} 392 PetscFunctionReturn(0); 393 } 394 395 PETSC_STATIC_INLINE PetscErrorCode PetscTimSortMergeHiWithArray_Private(char *arr, char *atarr, size_t asize, char *barr, char *btarr, size_t bsize, CompFunc cmp, void *ctx, PetscInt left, PetscInt mid, PetscInt right) 396 { 397 PetscInt i = right-mid, j = mid-1, k = right, gallopleft = 0, gallopright = 0; 398 const PetscInt rlen = right-mid+1; 399 PetscErrorCode ierr; 400 401 PetscFunctionBegin; 402 Petsc_memcpy2(atarr, (arr)+mid*asize, rlen*asize, btarr, (barr)+mid*bsize, rlen*bsize); 403 while ((i >= 0) && (j >= left)) { 404 if ((*cmp)((atarr)+i*asize, (arr)+j*asize, ctx) > 0) { 405 Petsc_memcpy2((arr)+k*asize, (atarr)+i*asize, asize, (barr)+k*bsize, (btarr)+i*bsize, bsize); 406 --k; 407 gallopleft = 0; 408 if (--i >= 0 && ++gallopright >= MIN_GALLOP_GLOBAL) { 409 PetscInt l1, l2, diff1, diff2; 410 do { 411 if (MIN_GALLOP_GLOBAL > 1) --MIN_GALLOP_GLOBAL; 412 /* search temp for left[j], can copy up to that many of temp into arr */ 413 ierr = PetscGallopSearchRight_Private(atarr, asize, cmp, ctx, 0, i, (arr)+j*asize, &l1);CHKERRQ(ierr); 414 diff1 = i-l1; 415 Petsc_memcpy2((arr)+(k-diff1+1)*asize, (atarr)+(l1+1)*asize, diff1*asize, (barr)+(k-diff1+1)*bsize, (btarr)+(l1+1)*bsize, diff1*bsize); 416 k -= diff1; 417 i = l1; 418 /* search left for temp[i], can move up to that many of left up arr */ 419 ierr = PetscGallopSearchRight_Private(arr, asize, cmp, ctx, left, j, (atarr)+i*asize, &l2);CHKERRQ(ierr); 420 diff2 = j-l2; 421 Petsc_memmove2((arr)+(k-diff2+1)*asize, (arr)+(l2+1)*asize, diff2*asize, (barr)+(k-diff2+1)*bsize, (barr)+(l2+1)*bsize, diff2*bsize); 422 k -= diff2; 423 j = l2; 424 if (i < 0 || j < left) break; 425 } while (diff1 > MIN_GALLOP_GLOBAL || diff2 > MIN_GALLOP_GLOBAL); 426 ++MIN_GALLOP_GLOBAL; 427 } 428 } else { 429 Petsc_memmove2((arr)+k*asize, (arr)+j*asize, asize, (barr)+k*bsize, (barr)+j*bsize, bsize); 430 --k; 431 gallopright = 0; 432 if (--j >= left && ++gallopleft >= MIN_GALLOP_GLOBAL) { 433 PetscInt l1, l2, diff1, diff2; 434 do { 435 if (MIN_GALLOP_GLOBAL > 1) --MIN_GALLOP_GLOBAL; 436 /* search left for temp[i], can move up to that many of left up arr */ 437 ierr = PetscGallopSearchRight_Private(arr, asize, cmp, ctx, left, j, (atarr)+i*asize, &l2);CHKERRQ(ierr); 438 diff2 = j-l2; 439 Petsc_memmove2((arr)+(k-diff2+1)*asize, (arr)+(l2+1)*asize, diff2*asize, (barr)+(k-diff2+1)*bsize, (barr)+(l2+1)*bsize, diff2*bsize); 440 k -= diff2; 441 j = l2; 442 /* search temp for left[j], can copy up to that many of temp into arr */ 443 ierr = PetscGallopSearchRight_Private(atarr, asize, cmp, ctx, 0, i, (arr)+j*asize, &l1);CHKERRQ(ierr); 444 diff1 = i-l1; 445 Petsc_memcpy2((arr)+(k-diff1+1)*asize, (atarr)+(l1+1)*asize, diff1*asize, (barr)+(k-diff1+1)*bsize, (btarr)+(l1+1)*bsize, diff1*bsize); 446 k -= diff1; 447 i = l1; 448 if (i < 0 || j < left) break; 449 } while (diff1 > MIN_GALLOP_GLOBAL || diff2 > MIN_GALLOP_GLOBAL); 450 ++MIN_GALLOP_GLOBAL; 451 } 452 } 453 } 454 if (i >= 0) {Petsc_memcpy2((arr)+left*asize, atarr, (i+1)*asize, (barr)+left*bsize, btarr, (i+1)*bsize);} 455 PetscFunctionReturn(0); 456 } 457 458 /* Left is inclusive lower bound of array slice, start is start location of unsorted section, right is inclusive upper 459 bound of array slice. If unsure of where unsorted section starts or if entire length is unsorted pass start = left */ 460 PETSC_STATIC_INLINE PetscErrorCode PetscInsertionSort_Private(char *arr, char *tarr, size_t size, CompFunc cmp, void *ctx, PetscInt left, PetscInt start, PetscInt right) 461 { 462 PetscInt i = start == left ? start+1 : start; 463 464 PetscFunctionBegin; 465 for (; i <= right; ++i) { 466 PetscInt j = i-1; 467 Petsc_memcpy(tarr, arr+(i*size), size); 468 while ((j >= left) && ((*cmp)(tarr, (arr)+j*size, ctx) < 0)) { 469 COPYSWAPPY(arr+(j+1)*size, arr+j*size, tarr+size, size); 470 --j; 471 } 472 Petsc_memcpy((arr)+(j+1)*size, tarr, size); 473 } 474 PetscFunctionReturn(0); 475 } 476 477 PETSC_STATIC_INLINE PetscErrorCode PetscInsertionSortWithArray_Private(char *arr, char *atarr, size_t asize, char *barr, char *btarr, size_t bsize, CompFunc cmp, void *ctx, PetscInt left, PetscInt start, PetscInt right) 478 { 479 PetscInt i = start == left ? start+1 : start; 480 481 PetscFunctionBegin; 482 for (; i <= right; ++i) { 483 PetscInt j = i-1; 484 Petsc_memcpy2(atarr, arr+(i*asize), asize, btarr, barr+(i*bsize), bsize); 485 while ((j >= left) && ((*cmp)(atarr, arr+(j*asize), ctx) < 0)) { 486 COPYSWAPPY2(arr+(j+1)*asize, arr+j*asize, asize, barr+(j+1)*bsize, barr+j*bsize, bsize, atarr+asize); 487 --j; 488 } 489 Petsc_memcpy2(arr+(j+1)*asize, atarr, asize, barr+(j+1)*bsize, btarr, bsize); 490 } 491 PetscFunctionReturn(0); 492 } 493 494 /* See PetscInsertionSort_Private */ 495 PETSC_STATIC_INLINE PetscErrorCode PetscBinaryInsertionSort_Private(char *arr, char *tarr, size_t size, CompFunc cmp, void *ctx, PetscInt left, PetscInt start, PetscInt right) 496 { 497 PetscInt i = start == left ? start+1 : start; 498 499 PetscFunctionBegin; 500 for (; i <= right; ++i) { 501 PetscInt l = left, r = i; 502 Petsc_memcpy(tarr, arr+(i*size), size); 503 do { 504 const PetscInt m = l + ((r - l) >> 1); 505 if ((*cmp)(tarr, arr+(m*size), ctx) < 0) { 506 r = m; 507 } else { 508 l = m + 1; 509 } 510 } while (l < r); 511 Petsc_memmove(arr+((l+1)*size), arr+(l*size), (i-l)*size); 512 Petsc_memcpy(arr+(l*size), tarr, size); 513 } 514 PetscFunctionReturn(0); 515 } 516 517 PETSC_STATIC_INLINE PetscErrorCode PetscBinaryInsertionSortWithArray_Private(char *arr, char *atarr, size_t asize, char *barr, char *btarr, size_t bsize, CompFunc cmp, void *ctx, PetscInt left, PetscInt start, PetscInt right) 518 { 519 PetscInt i = start == left ? start+1 : start; 520 521 PetscFunctionBegin; 522 for (; i <= right; ++i) { 523 PetscInt l = left, r = i; 524 Petsc_memcpy2(atarr, arr+(i*asize), asize, btarr, barr+(i*bsize), bsize); 525 do { 526 const PetscInt m = l + ((r - l) >> 1); 527 if ((*cmp)(atarr, arr+(m*asize), ctx) < 0) { 528 r = m; 529 } else { 530 l = m + 1; 531 } 532 } while (l < r); 533 Petsc_memmove2(arr+((l+1)*asize), arr+(l*asize), (i-l)*asize, barr+((l+1)*bsize), barr+(l*bsize), (i-l)*bsize); 534 Petsc_memcpy2(arr+(l*asize), atarr, asize, barr+(l*bsize), btarr, bsize); 535 } 536 PetscFunctionReturn(0); 537 } 538 539 typedef struct { 540 PetscInt size; 541 PetscInt start; 542 } PetscTimSortStack PETSC_ATTRIBUTEALIGNED(2*sizeof(PetscInt)); 543 544 typedef struct { 545 char *ptr PETSC_ATTRIBUTEALIGNED(PETSC_MEMALIGN); 546 size_t size; 547 size_t maxsize; 548 } PetscTimSortBuffer; 549 550 PETSC_STATIC_INLINE PetscErrorCode PetscTimSortResizeBuffer_Private(PetscTimSortBuffer *buff, size_t newSize) 551 { 552 PetscFunctionBegin; 553 if (PetscLikely(newSize <= buff->size)) PetscFunctionReturn(0); 554 { 555 /* Can't be larger than n, there is merit to simply allocating buff to n to begin with */ 556 PetscErrorCode ierr; 557 size_t newMax = PetscMin(newSize*newSize, buff->maxsize); 558 ierr = PetscFree(buff->ptr);CHKERRQ(ierr); 559 ierr = PetscMalloc1(newMax, &buff->ptr);CHKERRQ(ierr); 560 buff->size = newMax; 561 } 562 PetscFunctionReturn(0); 563 } 564 565 PETSC_STATIC_INLINE PetscErrorCode PetscTimSortForceCollapse_Private(char *arr, size_t size, CompFunc cmp, void *ctx, PetscTimSortBuffer *buff, PetscTimSortStack *stack, PetscInt stacksize) 566 { 567 PetscFunctionBegin; 568 for (;stacksize; --stacksize) { 569 /* A = stack[i-1], B = stack[i], if A[-1] <= B[0] means sorted */ 570 if ((*cmp)(arr+(stack[stacksize].start-1)*size, arr+(stack[stacksize].start)*size, ctx) > 0) { 571 PetscInt l, m = stack[stacksize].start, r; 572 PetscErrorCode ierr; 573 /* Search A for B[0] insertion */ 574 ierr = PetscGallopSearchLeft_Private(arr, size, cmp, ctx, stack[stacksize-1].start, stack[stacksize].start-1, (arr)+(stack[stacksize].start)*size, &l);CHKERRQ(ierr); 575 /* Search B for A[-1] insertion */ 576 ierr = PetscGallopSearchRight_Private(arr, size, cmp, ctx, stack[stacksize].start, stack[stacksize].start+stack[stacksize].size-1, (arr)+(stack[stacksize].start-1)*size, &r);CHKERRQ(ierr); 577 if (m-l <= r-m) { 578 ierr = PetscTimSortResizeBuffer_Private(buff, (m-l+1)*size);CHKERRQ(ierr); 579 ierr = PetscTimSortMergeLo_Private(arr, buff->ptr, size, cmp, ctx, l, m, r);CHKERRQ(ierr); 580 } else { 581 ierr = PetscTimSortResizeBuffer_Private(buff, (r-m+1)*size);CHKERRQ(ierr); 582 ierr = PetscTimSortMergeHi_Private(arr, buff->ptr, size, cmp, ctx, l, m, r);CHKERRQ(ierr); 583 } 584 } 585 /* Update A with merge */ 586 stack[stacksize-1].size += stack[stacksize].size; 587 } 588 PetscFunctionReturn(0); 589 } 590 591 PETSC_STATIC_INLINE PetscErrorCode PetscTimSortForceCollapseWithArray_Private(char *arr, size_t asize, char *barr, size_t bsize, CompFunc cmp, void *ctx, PetscTimSortBuffer *abuff, PetscTimSortBuffer *bbuff, PetscTimSortStack *stack, PetscInt stacksize) 592 { 593 PetscFunctionBegin; 594 for (;stacksize; --stacksize) { 595 /* A = stack[i-1], B = stack[i], if A[-1] <= B[0] means sorted */ 596 if ((*cmp)(arr+(stack[stacksize].start-1)*asize, arr+(stack[stacksize].start)*asize, ctx) > 0) { 597 PetscInt l, m = stack[stacksize].start, r; 598 PetscErrorCode ierr; 599 /* Search A for B[0] insertion */ 600 ierr = PetscGallopSearchLeft_Private(arr, asize, cmp, ctx, stack[stacksize-1].start, stack[stacksize].start-1, (arr)+(stack[stacksize].start)*asize, &l);CHKERRQ(ierr); 601 /* Search B for A[-1] insertion */ 602 ierr = PetscGallopSearchRight_Private(arr, asize, cmp, ctx, stack[stacksize].start, stack[stacksize].start+stack[stacksize].size-1, (arr)+(stack[stacksize].start-1)*asize, &r);CHKERRQ(ierr); 603 if (m-l <= r-m) { 604 ierr = PetscTimSortResizeBuffer_Private(abuff, (m-l+1)*asize);CHKERRQ(ierr); 605 ierr = PetscTimSortResizeBuffer_Private(bbuff, (m-l+1)*bsize);CHKERRQ(ierr); 606 ierr = PetscTimSortMergeLoWithArray_Private(arr, abuff->ptr, asize, barr, bbuff->ptr, bsize, cmp, ctx, l, m, r);CHKERRQ(ierr); 607 } else { 608 ierr = PetscTimSortResizeBuffer_Private(abuff, (r-m+1)*asize);CHKERRQ(ierr); 609 ierr = PetscTimSortResizeBuffer_Private(bbuff, (r-m+1)*bsize);CHKERRQ(ierr); 610 ierr = PetscTimSortMergeHiWithArray_Private(arr, abuff->ptr, asize, barr, bbuff->ptr, bsize, cmp, ctx, l, m, r);CHKERRQ(ierr); 611 } 612 } 613 /* Update A with merge */ 614 stack[stacksize-1].size += stack[stacksize].size; 615 } 616 PetscFunctionReturn(0); 617 } 618 619 PETSC_STATIC_INLINE PetscErrorCode PetscTimSortMergeCollapse_Private(char *arr, size_t size, CompFunc cmp, void *ctx, PetscTimSortBuffer *buff, PetscTimSortStack *stack, PetscInt *stacksize) 620 { 621 PetscInt i = *stacksize; 622 PetscErrorCode ierr; 623 624 PetscFunctionBegin; 625 while (i) { 626 PetscInt l, m, r, itemp = i; 627 628 if (i == 1) { 629 /* A = stack[i-1], B = stack[i] */ 630 if (stack[i-1].size < stack[i].size) { 631 /* if A[-1] <= B[0] then sorted */ 632 if ((*cmp)(arr+(stack[i].start-1)*size, arr+(stack[i].start)*size, ctx) > 0) { 633 m = stack[i].start; 634 /* Search A for B[0] insertion */ 635 ierr = PetscGallopSearchLeft_Private(arr, size, cmp, ctx, stack[i-1].start, stack[i].start-1, (arr)+stack[i].start*size, &l);CHKERRQ(ierr); 636 /* Search B for A[-1] insertion */ 637 ierr = PetscGallopSearchRight_Private(arr, size, cmp, ctx, stack[i].start, stack[i].start+stack[i].size-1, arr+(stack[i].start-1)*size, &r);CHKERRQ(ierr); 638 if (m-l <= r-m) { 639 ierr = PetscTimSortResizeBuffer_Private(buff, (m-l+1)*size);CHKERRQ(ierr); 640 ierr = PetscTimSortMergeLo_Private(arr, buff->ptr, size, cmp, ctx, l, m, r);CHKERRQ(ierr); 641 } else { 642 ierr = PetscTimSortResizeBuffer_Private(buff, (r-m+1)*size);CHKERRQ(ierr); 643 ierr = PetscTimSortMergeHi_Private(arr, buff->ptr, size, cmp, ctx, l, m, r);CHKERRQ(ierr); 644 } 645 } 646 /* Update A with merge */ 647 stack[i-1].size += stack[i].size; 648 --i; 649 } 650 } else { 651 /* i > 2, i.e. C exists 652 A = stack[i-2], B = stack[i-1], C = stack[i]; */ 653 if (stack[i-2].size <= stack[i-1].size+stack[i].size) { 654 if (stack[i-2].size < stack[i].size) { 655 /* merge B into A, but if A[-1] <= B[0] then already sorted */ 656 if ((*cmp)(arr+(stack[i-1].start-1)*size, arr+(stack[i-1].start)*size, ctx) > 0) { 657 m = stack[i-1].start; 658 /* Search A for B[0] insertion */ 659 ierr = PetscGallopSearchLeft_Private(arr, size, cmp, ctx, stack[i-2].start, stack[i-1].start-1, (arr)+(stack[i-1].start)*size, &l);CHKERRQ(ierr); 660 /* Search B for A[-1] insertion */ 661 ierr = PetscGallopSearchRight_Private(arr, size, cmp, ctx, stack[i-1].start, stack[i-1].start+stack[i-1].size-1, (arr)+(stack[i-1].start-1)*size, &r);CHKERRQ(ierr); 662 if (m-l <= r-m) { 663 ierr = PetscTimSortResizeBuffer_Private(buff, (m-l+1)*size);CHKERRQ(ierr); 664 ierr = PetscTimSortMergeLo_Private(arr, buff->ptr, size, cmp, ctx, l, m, r);CHKERRQ(ierr); 665 } else { 666 ierr = PetscTimSortResizeBuffer_Private(buff, (r-m+1)*size);CHKERRQ(ierr); 667 ierr = PetscTimSortMergeHi_Private(arr, buff->ptr, size, cmp, ctx, l, m, r);CHKERRQ(ierr); 668 } 669 } 670 /* Update A with merge */ 671 stack[i-2].size += stack[i-1].size; 672 /* Push C up the stack */ 673 stack[i-1].start = stack[i].start; 674 stack[i-1].size = stack[i].size; 675 } else { 676 /* merge C into B */ 677 mergeBC: 678 /* If B[-1] <= C[0] then... you know the drill */ 679 if ((*cmp)(arr+(stack[i].start-1)*size, arr+(stack[i].start)*size, ctx) > 0) { 680 m = stack[i].start; 681 /* Search B for C[0] insertion */ 682 ierr = PetscGallopSearchLeft_Private(arr, size, cmp, ctx, stack[i-1].start, stack[i].start-1, arr+stack[i].start*size, &l);CHKERRQ(ierr); 683 /* Search C for B[-1] insertion */ 684 ierr = PetscGallopSearchRight_Private(arr, size, cmp, ctx, stack[i].start, stack[i].start+stack[i].size-1, (arr)+(stack[i].start-1)*size, &r);CHKERRQ(ierr); 685 if (m-l <= r-m) { 686 ierr = PetscTimSortResizeBuffer_Private(buff, (m-l+1)*size);CHKERRQ(ierr); 687 ierr = PetscTimSortMergeLo_Private(arr, buff->ptr, size, cmp, ctx, l, m, r);CHKERRQ(ierr); 688 } else { 689 ierr = PetscTimSortResizeBuffer_Private(buff, (r-m+1)*size);CHKERRQ(ierr); 690 ierr = PetscTimSortMergeHi_Private(arr, buff->ptr, size, cmp, ctx, l, m, r);CHKERRQ(ierr); 691 } 692 } 693 /* Update B with merge */ 694 stack[i-1].size += stack[i].size; 695 } 696 --i; 697 } else if (stack[i-1].size <= stack[i].size) { 698 /* merge C into B */ 699 goto mergeBC; 700 } 701 } 702 if (itemp == i) break; 703 } 704 *stacksize = i; 705 PetscFunctionReturn(0); 706 } 707 708 PETSC_STATIC_INLINE PetscErrorCode PetscTimSortMergeCollapseWithArray_Private(char *arr, size_t asize, char *barr, size_t bsize, CompFunc cmp, void *ctx, PetscTimSortBuffer *abuff, PetscTimSortBuffer *bbuff, PetscTimSortStack *stack, PetscInt *stacksize) 709 { 710 PetscInt i = *stacksize; 711 PetscErrorCode ierr; 712 713 PetscFunctionBegin; 714 while (i) { 715 PetscInt l, m, r, itemp = i; 716 717 if (i == 1) { 718 /* A = stack[i-1], B = stack[i] */ 719 if (stack[i-1].size < stack[i].size) { 720 /* if A[-1] <= B[0] then sorted */ 721 if ((*cmp)(arr+(stack[i].start-1)*asize, arr+(stack[i].start)*asize, ctx) > 0) { 722 m = stack[i].start; 723 /* Search A for B[0] insertion */ 724 ierr = PetscGallopSearchLeft_Private(arr, asize, cmp, ctx, stack[i-1].start, stack[i].start-1, (arr)+stack[i].start*asize, &l);CHKERRQ(ierr); 725 /* Search B for A[-1] insertion */ 726 ierr = PetscGallopSearchRight_Private(arr, asize, cmp, ctx, stack[i].start, stack[i].start+stack[i].size-1, arr+(stack[i].start-1)*asize, &r);CHKERRQ(ierr); 727 if (m-l <= r-m) { 728 ierr = PetscTimSortResizeBuffer_Private(abuff, (m-l+1)*asize);CHKERRQ(ierr); 729 ierr = PetscTimSortResizeBuffer_Private(bbuff, (m-l+1)*bsize);CHKERRQ(ierr); 730 ierr = PetscTimSortMergeLoWithArray_Private(arr, abuff->ptr, asize, barr, bbuff->ptr, bsize, cmp, ctx, l, m, r);CHKERRQ(ierr); 731 } else { 732 ierr = PetscTimSortResizeBuffer_Private(abuff, (r-m+1)*asize);CHKERRQ(ierr); 733 ierr = PetscTimSortResizeBuffer_Private(bbuff, (r-m+1)*bsize);CHKERRQ(ierr); 734 ierr = PetscTimSortMergeHiWithArray_Private(arr, abuff->ptr, asize, barr, bbuff->ptr, bsize, cmp, ctx, l, m, r);CHKERRQ(ierr); 735 } 736 } 737 /* Update A with merge */ 738 stack[i-1].size += stack[i].size; 739 --i; 740 } 741 } else { 742 /* i > 2, i.e. C exists 743 A = stack[i-2], B = stack[i-1], C = stack[i]; */ 744 if (stack[i-2].size <= stack[i-1].size+stack[i].size) { 745 if (stack[i-2].size < stack[i].size) { 746 /* merge B into A, but if A[-1] <= B[0] then already sorted */ 747 if ((*cmp)(arr+(stack[i-1].start-1)*asize, arr+(stack[i-1].start)*asize, ctx) > 0) { 748 m = stack[i-1].start; 749 /* Search A for B[0] insertion */ 750 ierr = PetscGallopSearchLeft_Private(arr, asize, cmp, ctx, stack[i-2].start, stack[i-1].start-1, (arr)+(stack[i-1].start)*asize, &l);CHKERRQ(ierr); 751 /* Search B for A[-1] insertion */ 752 ierr = PetscGallopSearchRight_Private(arr, asize, cmp, ctx, stack[i-1].start, stack[i-1].start+stack[i-1].size-1, (arr)+(stack[i-1].start-1)*asize, &r);CHKERRQ(ierr); 753 if (m-l <= r-m) { 754 ierr = PetscTimSortResizeBuffer_Private(abuff, (m-l+1)*asize);CHKERRQ(ierr); 755 ierr = PetscTimSortResizeBuffer_Private(bbuff, (m-l+1)*bsize);CHKERRQ(ierr); 756 ierr = PetscTimSortMergeLoWithArray_Private(arr, abuff->ptr, asize, barr, bbuff->ptr, bsize, cmp, ctx, l, m, r);CHKERRQ(ierr); 757 } else { 758 ierr = PetscTimSortResizeBuffer_Private(abuff, (r-m+1)*asize);CHKERRQ(ierr); 759 ierr = PetscTimSortResizeBuffer_Private(bbuff, (r-m+1)*bsize);CHKERRQ(ierr); 760 ierr = PetscTimSortMergeHiWithArray_Private(arr, abuff->ptr, asize, barr, bbuff->ptr, bsize, cmp, ctx, l, m, r);CHKERRQ(ierr); 761 } 762 } 763 /* Update A with merge */ 764 stack[i-2].size += stack[i-1].size; 765 /* Push C up the stack */ 766 stack[i-1].start = stack[i].start; 767 stack[i-1].size = stack[i].size; 768 } else { 769 /* merge C into B */ 770 mergeBC: 771 /* If B[-1] <= C[0] then... you know the drill */ 772 if ((*cmp)(arr+(stack[i].start-1)*asize, arr+(stack[i].start)*asize, ctx) > 0) { 773 m = stack[i].start; 774 /* Search B for C[0] insertion */ 775 ierr = PetscGallopSearchLeft_Private(arr, asize, cmp, ctx, stack[i-1].start, stack[i].start-1, arr+stack[i].start*asize, &l);CHKERRQ(ierr); 776 /* Search C for B[-1] insertion */ 777 ierr = PetscGallopSearchRight_Private(arr, asize, cmp, ctx, stack[i].start, stack[i].start+stack[i].size-1, (arr)+(stack[i].start-1)*asize, &r);CHKERRQ(ierr); 778 if (m-l <= r-m) { 779 ierr = PetscTimSortResizeBuffer_Private(abuff, (m-l+1)*asize);CHKERRQ(ierr); 780 ierr = PetscTimSortResizeBuffer_Private(bbuff, (m-l+1)*bsize);CHKERRQ(ierr); 781 ierr = PetscTimSortMergeLoWithArray_Private(arr, abuff->ptr, asize, barr, bbuff->ptr, bsize, cmp, ctx, l, m, r);CHKERRQ(ierr); 782 } else { 783 ierr = PetscTimSortResizeBuffer_Private(abuff, (r-m+1)*asize);CHKERRQ(ierr); 784 ierr = PetscTimSortResizeBuffer_Private(bbuff, (r-m+1)*bsize);CHKERRQ(ierr); 785 ierr = PetscTimSortMergeHiWithArray_Private(arr, abuff->ptr, asize, barr, bbuff->ptr, bsize, cmp, ctx, l, m, r);CHKERRQ(ierr); 786 } 787 } 788 /* Update B with merge */ 789 stack[i-1].size += stack[i].size; 790 } 791 --i; 792 } else if (stack[i-1].size <= stack[i].size) { 793 /* merge C into B */ 794 goto mergeBC; 795 } 796 } 797 if (itemp == i) break; 798 } 799 *stacksize = i; 800 PetscFunctionReturn(0); 801 } 802 803 /* March sequentially through the array building up a "run" of weakly increasing or strictly decreasing contiguous 804 elements. Decreasing runs are reversed by swapping. If the run is less than minrun, artificially extend it via either 805 binary insertion sort or regulat insertion sort */ 806 PETSC_STATIC_INLINE PetscErrorCode PetscTimSortBuildRun_Private(char *arr, char *tarr, size_t size, CompFunc cmp, void *ctx, PetscInt n, PetscInt minrun, PetscInt runstart, PetscInt *runend) 807 { 808 const PetscInt re = PetscMin(runstart+minrun, n-1); 809 PetscInt ri = runstart; 810 811 PetscFunctionBegin; 812 if (PetscUnlikely(runstart == n-1)) {*runend = runstart; PetscFunctionReturn(0);} 813 /* guess whether run is ascending or descending and tally up the longest consecutive run. essentially a coinflip for random data */ 814 if ((*cmp)((arr)+(ri+1)*size, (arr)+ri*size, ctx) < 0) { 815 ++ri; 816 while (ri < n-1) { 817 if ((*cmp)((arr)+(ri+1)*size, (arr)+ri*size, ctx) >= 0) break; 818 ++ri; 819 } 820 { 821 PetscInt lo = runstart, hi = ri; 822 for (; lo < hi; ++lo, --hi) { 823 COPYSWAPPY(arr+lo*size, arr+hi*size, tarr, size); 824 } 825 } 826 } else { 827 ++ri; 828 while (ri < n-1) { 829 if ((*cmp)((arr)+(ri+1)*size, (arr)+ri*size, ctx) < 0) break; 830 ++ri; 831 } 832 } 833 #if defined(PETSC_USE_DEBUG) 834 { 835 PetscErrorCode ierr; 836 ierr = PetscInfo1(NULL, "natural run length = %D\n", ri-runstart+1);CHKERRQ(ierr); 837 } 838 #endif 839 if (ri < re) { 840 /* the attempt failed, this section likely contains random data. If ri got close to minrun (within 50%) then we try 841 binary search */ 842 if (ri-runstart <= minrun >> 1) { 843 ++MIN_GALLOP_GLOBAL; /* didn't get close hedge our bets against random data */ 844 PetscInsertionSort_Private(arr, tarr, size, cmp, ctx, runstart, ri, re); 845 } else { 846 PetscBinaryInsertionSort_Private(arr, tarr, size, cmp, ctx, runstart, ri, re); 847 } 848 *runend = re; 849 } else *runend = ri; 850 PetscFunctionReturn(0); 851 } 852 853 PETSC_STATIC_INLINE PetscErrorCode PetscTimSortBuildRunWithArray_Private(char *arr, char *atarr, size_t asize, char *barr, char *btarr, size_t bsize, CompFunc cmp, void *ctx, PetscInt n, PetscInt minrun, PetscInt runstart, PetscInt *runend) 854 { 855 const PetscInt re = PetscMin(runstart+minrun, n-1); 856 PetscInt ri = runstart; 857 858 PetscFunctionBegin; 859 if (PetscUnlikely(runstart == n-1)) {*runend = runstart; PetscFunctionReturn(0);} 860 /* guess whether run is ascending or descending and tally up the longest consecutive run. essentially a coinflip for random data */ 861 if ((*cmp)((arr)+(ri+1)*asize, arr+(ri*asize), ctx) < 0) { 862 ++ri; 863 while (ri < n-1) { 864 if ((*cmp)((arr)+(ri+1)*asize, (arr)+ri*asize, ctx) >= 0) break; 865 ++ri; 866 } 867 { 868 PetscInt lo = runstart, hi = ri; 869 for (; lo < hi; ++lo, --hi) { 870 COPYSWAPPY2(arr+lo*asize, arr+hi*asize, asize, barr+lo*bsize, barr+hi*bsize, bsize, atarr); 871 } 872 } 873 } else { 874 ++ri; 875 while (ri < n-1) { 876 if ((*cmp)((arr)+(ri+1)*asize, (arr)+ri*asize, ctx) < 0) break; 877 ++ri; 878 } 879 } 880 #if defined(PETSC_USE_DEBUG) 881 { 882 PetscErrorCode ierr; 883 ierr = PetscInfo1(NULL, "natural run length = %D\n", ri-runstart+1);CHKERRQ(ierr); 884 } 885 #endif 886 if (ri < re) { 887 /* the attempt failed, this section likely contains random data. If ri got close to minrun (within 50%) then we try 888 binary search */ 889 if (ri-runstart <= minrun >> 1) { 890 ++MIN_GALLOP_GLOBAL; /* didn't get close hedge our bets against random data */ 891 PetscInsertionSortWithArray_Private(arr, atarr, asize, barr, btarr, bsize, cmp, ctx, runstart, ri, re); 892 } else { 893 PetscBinaryInsertionSortWithArray_Private(arr, atarr, asize, barr, btarr, bsize, cmp, ctx, runstart, ri, re); 894 } 895 *runend = re; 896 } else *runend = ri; 897 PetscFunctionReturn(0); 898 } 899 900 /*@C 901 PetscTimSort - Sorts an array in place in increasing order using Tim Peters adaptive sorting algorithm. 902 903 Not Collective 904 905 Input Parameters: 906 + n - number of values 907 . arr - array to be sorted 908 . size - size in bytes of the datatype held in arr 909 . cmp - function pointer to comparison function 910 - ctx - optional context to be passed to comparison function, NULL if not needed 911 912 Output Parameters: 913 . arr - sorted array 914 915 Notes: 916 Timsort makes the assumption that input data is already likely partially ordered, or that it contains contiguous 917 sections (termed 'runs') where the data is locally ordered (but not necessarily globally ordered). It therefore aims to 918 select slices of the array in such a way that resulting mergesorts operate on near perfectly length-balanced arrays. To 919 do so it repeatedly triggers attempts throughout to merge adjacent runs. 920 921 Should one run continuously "win" a comparison the algorithm begins the "gallop" phase. It will aggressively search 922 the "winner" for the location of the "losers" next entry (and vice versa) to copy all preceding elements into place in 923 bulk. However if the data is truly unordered (as is the case with random data) the immense gains possible from these 924 searches are expected __not__ to repay their costs. While adjacent arrays are almost all nearly the same size, they 925 likely all contain similar data. 926 927 Sample usage: 928 The comparison function must follow the qsort() comparison function paradigm, returning the sign of the difference 929 between its arguments. If left < right : return -1, if left == right : return 0, if left > right : return 1. The user 930 may also 931 change or reverse the order of the sort by flipping the above. Note that stability of the sort is only guaranteed if 932 the comparison function forms a valid trigraph. For example when sorting an array of type "my_type" in increasing 933 order 934 935 .vb 936 int my_increasing_comparison_function(const void *left, const void *right, void *ctx) { 937 my_type l = *(my_type *) left, r = *(my_type *) right; 938 return (l < r) ? -1 : (l > r); 939 } 940 .ve 941 Note the context is unused here but you may use it to pass and subsequently access whatever information required 942 inside the comparison function. The context pointer will unaltered except for any changes made inside the comparison function. 943 Then pass the function 944 .vb 945 PetscTimSort(n, arr, sizeof(arr[0]), my_increasing_comparison_function, ctx) 946 .ve 947 948 Fortran Notes: 949 To use this from fortran you must write a comparison subroutine with 4 arguments which accepts left, right, ctx and 950 returns result. For example 951 .vb 952 subroutine CompareIntegers(left,right,ctx,result) 953 implicit none 954 955 PetscInt,intent(in) :: left, right 956 type(UserCtx) :: ctx 957 integer,intent(out) :: result 958 959 if (left < right) then 960 result = -1 961 else if (left == right) then 962 result = 0 963 else 964 result = 1 965 end if 966 return 967 end subroutine CompareIntegers 968 .ve 969 970 References: 971 1. - Tim Peters. https://bugs.python.org/file4451/timsort.txt 972 973 Level: developer 974 975 .seealso: PetscTimSortWithArray(), PetscIntSortSemiOrdered(), PetscRealSortSemiOrdered(), PetscMPIIntSortSemiOrdered() 976 @*/ 977 PetscErrorCode PetscTimSort(PetscInt n, void *arr, size_t size, int (*cmp)(const void *, const void *, void *), void *ctx) 978 { 979 PetscInt stacksize = 0, minrun, runstart = 0, runend = 0; 980 PetscTimSortStack runstack[128]; 981 PetscTimSortBuffer buff; 982 PetscErrorCode ierr; 983 /* stacksize = log_phi(n) = log_2(n)/log_2(phi), so 128 is enough for ~5.614e26 elements. 984 It is so unlikely that this limit is reached that this is __never__ checked for */ 985 986 PetscFunctionBegin; 987 /* Compute minrun. Minrun should be (32, 65) such that N/minrun 988 is a power of 2 or one plus a power of 2 */ 989 { 990 PetscInt t = n, r = 0; 991 /* r becomes 1 if the least significant bits contain at least one off bit */ 992 while (t >= 64) { 993 r |= t & 1; 994 t >>= 1; 995 } 996 minrun = t + r; 997 } 998 if (PetscDefined(USE_DEBUG)) { 999 ierr = PetscInfo1(NULL, "minrun = %D\n", minrun);CHKERRQ(ierr); 1000 if (n < 64) { 1001 ierr = PetscInfo1(NULL, "n %D < 64, consider using PetscSortInt() instead\n", n);CHKERRQ(ierr); 1002 } else if ((minrun < 32) || (minrun > 65)) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_PLIB,"Calculated minrun %D not in range (32,65)",minrun); 1003 } 1004 ierr = PetscMalloc1((size_t) minrun*size, &buff.ptr);CHKERRQ(ierr); 1005 buff.size = (size_t) minrun*size; 1006 buff.maxsize = (size_t) n*size; 1007 MIN_GALLOP_GLOBAL = MIN_GALLOP_CONST_GLOBAL; 1008 while (runstart < n) { 1009 /* Check if additional entries are at least partially ordered and build natural run */ 1010 ierr = PetscTimSortBuildRun_Private((char *)arr, buff.ptr, size, cmp, ctx, n, minrun, runstart, &runend);CHKERRQ(ierr); 1011 runstack[stacksize].start = runstart; 1012 runstack[stacksize].size = runend-runstart+1; 1013 ierr = PetscTimSortMergeCollapse_Private((char *)arr, size, cmp, ctx, &buff, runstack, &stacksize);CHKERRQ(ierr); 1014 ++stacksize; 1015 runstart = runend+1; 1016 } 1017 /* Have been inside while, so discard last stacksize++ */ 1018 --stacksize; 1019 ierr = PetscTimSortForceCollapse_Private((char *)arr, size, cmp, ctx, &buff, runstack, stacksize);CHKERRQ(ierr); 1020 ierr = PetscFree(buff.ptr);CHKERRQ(ierr); 1021 MIN_GALLOP_GLOBAL = MIN_GALLOP_CONST_GLOBAL; 1022 PetscFunctionReturn(0); 1023 } 1024 1025 /*@C 1026 PetscTimSortWithArray - Sorts an array in place in increasing order using Tim Peters adaptive sorting algorithm and 1027 reorders a second array to match the first. The arrays need not be the same type. 1028 1029 Not Collective 1030 1031 Input Parameters: 1032 + n - number of values 1033 . asize - size in bytes of the datatype held in arr 1034 . bsize - size in bytes of the datatype held in barr 1035 . cmp - function pointer to comparison function 1036 - ctx - optional context to be passed to comparison function, NULL if not needed 1037 1038 Input/Output Parameters: 1039 + arr - array to be sorted, on output it is sorted 1040 - barr - array to be reordered, on output it is reordered 1041 1042 Notes: 1043 The arrays need not be of the same type, however barr MUST contain at least as many elements as arr and the two CANNOT 1044 overlap. 1045 1046 Timsort makes the assumption that input data is already likely partially ordered, or that it contains contiguous 1047 sections (termed 'runs') where the data is locally ordered (but not necessarily globally ordered). It therefore aims 1048 to select slices of the array in such a way that resulting mergesorts operate on near perfectly length-balanced 1049 arrays. To do so it repeatedly triggers attempts throughout to merge adjacent runs. 1050 1051 Should one run continuously "win" a comparison the algorithm begins the "gallop" phase. It will aggressively search 1052 the "winner" for the location of the "losers" next entry (and vice versa) to copy all preceding elements into place in 1053 bulk. However if the data is truly unordered (as is the case with random data) the immense gains possible from these 1054 searches are expected __not__ to repay their costs. While adjacent arrays are almost all nearly the same size, they 1055 likely all contain similar data. 1056 1057 Sample usage: 1058 The comparison function must follow the qsort() comparison function paradigm, returning the sign of the difference 1059 between its arguments. If left < right : return -1, if left == right : return 0, if left > right : return 1. The user 1060 may also change or reverse the order of the sort by flipping the above. Note that stability of the sort is only 1061 guaranteed if the comparison function forms a valid trigraph. For example when sorting an array of type "my_type" in 1062 increasing order 1063 1064 .vb 1065 int my_increasing_comparison_function(const void *left, const void *right, void *ctx) { 1066 my_type l = *(my_type *) left, r = *(my_type *) right; 1067 return (l < r) ? -1 : (l > r); 1068 } 1069 .ve 1070 Note the context is unused here but you may use it to pass and subsequently access whatever information required 1071 inside the comparison function. The context pointer will unaltered except for any changes made inside the comparison function. 1072 Then pass the function 1073 .vb 1074 PetscTimSortWithArray(n, arr, sizeof(arr[0]), barr, sizeof(barr[0]), my_increasing_comparison_function, ctx) 1075 .ve 1076 1077 Fortran Notes: 1078 To use this from fortran you must write a comparison subroutine with 4 arguments which accepts left, right, ctx and 1079 returns result. For example 1080 .vb 1081 subroutine CompareIntegers(left,right,ctx,result) 1082 implicit none 1083 1084 PetscInt,intent(in) :: left, right 1085 type(UserCtx) :: ctx 1086 integer,intent(out) :: result 1087 1088 if (left < right) then 1089 result = -1 1090 else if (left == right) then 1091 result = 0 1092 else 1093 result = 1 1094 end if 1095 return 1096 end subroutine CompareIntegers 1097 .ve 1098 1099 References: 1100 1. - Tim Peters. https://bugs.python.org/file4451/timsort.txt 1101 1102 Level: developer 1103 1104 .seealso: PetscTimSort(), PetscIntSortSemiOrderedWithArray(), PetscRealSortSemiOrderedWithArrayInt(), PetscMPIIntSortSemiOrderedWithArray() 1105 @*/ 1106 PetscErrorCode PetscTimSortWithArray(PetscInt n, void *arr, size_t asize, void *barr, size_t bsize, int (*cmp)(const void *, const void *, void *), void *ctx) 1107 { 1108 PetscInt stacksize = 0, minrun, runstart = 0, runend = 0; 1109 PetscTimSortStack runstack[128]; 1110 PetscTimSortBuffer abuff, bbuff; 1111 PetscErrorCode ierr; 1112 /* stacksize = log_phi(n) = log_2(n)/log_2(phi), so 128 is enough for ~5.614e26 elements. 1113 It is so unlikely that this limit is reached that this is __never__ checked for */ 1114 1115 PetscFunctionBegin; 1116 /* Compute minrun. Minrun should be (32, 65) such that N/minrun 1117 is a power of 2 or one plus a power of 2 */ 1118 { 1119 PetscInt t = n, r = 0; 1120 /* r becomes 1 if the least significant bits contain at least one off bit */ 1121 while (t >= 64) { 1122 r |= t & 1; 1123 t >>= 1; 1124 } 1125 minrun = t + r; 1126 } 1127 if (PetscDefined(USE_DEBUG)) { 1128 ierr = PetscInfo1(NULL, "minrun = %D\n", minrun);CHKERRQ(ierr); 1129 if ((n >= 64) && ((minrun < 32) || (minrun > 65))) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_PLIB,"Calculated minrun %D not in range (32,65)",minrun); 1130 } 1131 ierr = PetscMalloc1((size_t) minrun*asize, &abuff.ptr);CHKERRQ(ierr); 1132 abuff.size = (size_t) minrun*asize; 1133 abuff.maxsize = (size_t) n*asize; 1134 ierr = PetscMalloc1((size_t) minrun*bsize, &bbuff.ptr);CHKERRQ(ierr); 1135 bbuff.size = (size_t) minrun*bsize; 1136 bbuff.maxsize = (size_t) n*bsize; 1137 MIN_GALLOP_GLOBAL = MIN_GALLOP_CONST_GLOBAL; 1138 while (runstart < n) { 1139 /* Check if additional entries are at least partially ordered and build natural run */ 1140 ierr = PetscTimSortBuildRunWithArray_Private((char *)arr, abuff.ptr, asize, (char *)barr, bbuff.ptr, bsize, cmp, ctx, n, minrun, runstart, &runend);CHKERRQ(ierr); 1141 runstack[stacksize].start = runstart; 1142 runstack[stacksize].size = runend-runstart+1; 1143 ierr = PetscTimSortMergeCollapseWithArray_Private((char *)arr, asize, (char *)barr, bsize, cmp, ctx, &abuff, &bbuff, runstack, &stacksize);CHKERRQ(ierr); 1144 ++stacksize; 1145 runstart = runend+1; 1146 } 1147 /* Have been inside while, so discard last stacksize++ */ 1148 --stacksize; 1149 ierr = PetscTimSortForceCollapseWithArray_Private((char *)arr, asize, (char *)barr, bsize, cmp, ctx, &abuff, &bbuff, runstack, stacksize);CHKERRQ(ierr); 1150 ierr = PetscFree(abuff.ptr);CHKERRQ(ierr); 1151 ierr = PetscFree(bbuff.ptr);CHKERRQ(ierr); 1152 MIN_GALLOP_GLOBAL = MIN_GALLOP_CONST_GLOBAL; 1153 PetscFunctionReturn(0); 1154 } 1155 1156 /*@ 1157 PetscIntSortSemiOrdered - Sorts an array of integers in place in increasing order. 1158 1159 Not Collective 1160 1161 Input Parameters: 1162 + n - number of values 1163 - arr - array of integers 1164 1165 Output Parameters: 1166 . arr - sorted array of integers 1167 1168 Notes: 1169 If the array is less than 64 entries long PetscSortInt() is automatically used. 1170 1171 This function serves as an alternative to PetscSortInt(). While this function works for any array of integers it is 1172 significantly faster if the array is not totally random. There are exceptions to this and so it is __highly__ 1173 recommended that the user benchmark their code to see which routine is fastest. 1174 1175 Level: intermediate 1176 1177 .seealso: PetscTimSort(), PetscSortInt(), PetscSortIntWithPermutation() 1178 @*/ 1179 PetscErrorCode PetscIntSortSemiOrdered(PetscInt n, PetscInt arr[]) 1180 { 1181 PetscErrorCode ierr; 1182 PetscFunctionBegin; 1183 if (n <= 1) PetscFunctionReturn(0); 1184 PetscValidIntPointer(arr,2); 1185 if (n < 64) { 1186 ierr = PetscSortInt(n, arr);CHKERRQ(ierr); 1187 } else { 1188 ierr = PetscTimSort(n, arr, sizeof(PetscInt), Compare_PetscInt_Private, NULL);CHKERRQ(ierr); 1189 } 1190 PetscFunctionReturn(0); 1191 } 1192 1193 /*@ 1194 PetscIntSortSemiOrderedWithArray - Sorts an array of integers in place in increasing order and reorders a second 1195 array to match the first. 1196 1197 Not Collective 1198 1199 Input Parameter: 1200 . n - number of values 1201 1202 Input/Output Parameters: 1203 + arr1 - array of integers to be sorted, modified on output 1204 - arr2 - array of integers to be reordered, modified on output 1205 1206 Notes: 1207 The arrays CANNOT overlap. 1208 1209 This function serves as an alternative to PetscSortIntWithArray(). While this function works for any array of integers it is 1210 significantly faster if the array is not totally random. There are exceptions to this and so it is __highly__ 1211 recommended that the user benchmark their code to see which routine is fastest. 1212 1213 Level: intermediate 1214 1215 .seealso: PetscTimSortWithArray(), PetscSortIntWithArray(), PetscSortIntWithPermutation() 1216 @*/ 1217 PetscErrorCode PetscIntSortSemiOrderedWithArray(PetscInt n, PetscInt arr1[], PetscInt arr2[]) 1218 { 1219 PetscErrorCode ierr; 1220 PetscFunctionBegin; 1221 if (n <= 1) PetscFunctionReturn(0); 1222 PetscValidIntPointer(arr1,2); 1223 PetscValidIntPointer(arr2,3); 1224 /* cannot export out to PetscIntSortWithArray here since it isn't stable */ 1225 ierr = PetscTimSortWithArray(n, arr1, sizeof(PetscInt), arr2, sizeof(PetscInt), Compare_PetscInt_Private, NULL);CHKERRQ(ierr); 1226 PetscFunctionReturn(0); 1227 } 1228 1229 /*@ 1230 PetscMPIIntSortSemiOrdered - Sorts an array of PetscMPIInts in place in increasing order. 1231 1232 Not Collective 1233 1234 Input Parameters: 1235 + n - number of values 1236 - arr - array of PetscMPIInts 1237 1238 Output Parameters: 1239 . arr - sorted array of integers 1240 1241 Notes: 1242 If the array is less than 64 entries long PetscSortMPIInt() is automatically used. 1243 1244 This function serves as an alternative to PetscSortMPIInt(). While this function works for any array of PetscMPIInts it is 1245 significantly faster if the array is not totally random. There are exceptions to this and so it is __highly__ 1246 recommended that the user benchmark their code to see which routine is fastest. 1247 1248 Level: intermediate 1249 1250 .seealso: PetscTimSort(), PetscSortMPIInt() 1251 @*/ 1252 PetscErrorCode PetscMPIIntSortSemiOrdered(PetscInt n, PetscMPIInt arr[]) 1253 { 1254 PetscErrorCode ierr; 1255 1256 PetscFunctionBegin; 1257 if (n <= 1) PetscFunctionReturn(0); 1258 PetscValidIntPointer(arr,2); 1259 if (n < 64) { 1260 ierr = PetscSortMPIInt(n, arr);CHKERRQ(ierr); 1261 } else { 1262 ierr = PetscTimSort(n, arr, sizeof(PetscMPIInt), Compare_PetscMPIInt_Private, NULL);CHKERRQ(ierr); 1263 } 1264 PetscFunctionReturn(0); 1265 } 1266 1267 /*@ 1268 PetscMPIIntSortSemiOrderedWithArray - Sorts an array of integers in place in increasing order and reorders a second 1269 array to match the first. 1270 1271 Not Collective 1272 1273 Input Parameter: 1274 . n - number of values 1275 1276 Input/Output Parameters: 1277 . arr1 - array of integers to be sorted, modified on output 1278 - arr2 - array of integers to be reordered, modified on output 1279 1280 Notes: 1281 The arrays CANNOT overlap. 1282 1283 This function serves as an alternative to PetscSortMPIIntWithArray(). While this function works for any array of integers it is 1284 significantly faster if the array is not totally random. There are exceptions to this and so it is __highly__ 1285 recommended that the user benchmark their code to see which routine is fastest. 1286 1287 Level: intermediate 1288 1289 .seealso: PetscTimSortWithArray(), PetscSortMPIIntWithArray(), PetscSortMPIIntWithPermutation() 1290 @*/ 1291 PetscErrorCode PetscMPIIntSortSemiOrderedWithArray(PetscInt n, PetscMPIInt arr1[], PetscMPIInt arr2[]) 1292 { 1293 PetscErrorCode ierr; 1294 PetscFunctionBegin; 1295 if (n <= 1) PetscFunctionReturn(0); 1296 PetscValidIntPointer(arr1,2); 1297 PetscValidIntPointer(arr2,3); 1298 /* cannot export out to PetscMPIIntSortWithArray here since it isn't stable */ 1299 ierr = PetscTimSortWithArray(n, arr1, sizeof(PetscMPIInt), arr2, sizeof(PetscMPIInt), Compare_PetscMPIInt_Private, NULL);CHKERRQ(ierr); 1300 PetscFunctionReturn(0); 1301 } 1302 1303 /*@ 1304 PetscRealSortSemiOrdered - Sorts an array of PetscReals in place in increasing order. 1305 1306 Not Collective 1307 1308 Input Parameters: 1309 + n - number of values 1310 - arr - array of PetscReals 1311 1312 Output Parameters: 1313 . arr - sorted array of integers 1314 1315 Notes: 1316 If the array is less than 64 entries long PetscSortReal() is automatically used. 1317 1318 This function serves as an alternative to PetscSortReal(). While this function works for any array of PetscReals it is 1319 significantly faster if the array is not totally random. There are exceptions to this and so it is __highly__ 1320 recommended that the user benchmark their code to see which routine is fastest. 1321 1322 Level: intermediate 1323 1324 .seealso: PetscTimSort(), PetscSortReal(), PetscSortRealWithPermutation() 1325 @*/ 1326 PetscErrorCode PetscRealSortSemiOrdered(PetscInt n, PetscReal arr[]) 1327 { 1328 PetscErrorCode ierr; 1329 1330 PetscFunctionBegin; 1331 if (n <= 1) PetscFunctionReturn(0); 1332 PetscValidRealPointer(arr,2); 1333 if (n < 64) { 1334 ierr = PetscSortReal(n, arr);CHKERRQ(ierr); 1335 } else { 1336 ierr = PetscTimSort(n, arr, sizeof(PetscReal), Compare_PetscReal_Private, NULL);CHKERRQ(ierr); 1337 } 1338 PetscFunctionReturn(0); 1339 } 1340 1341 /*@ 1342 PetscRealSortSemiOrderedWithArrayInt - Sorts an array of PetscReals in place in increasing order and reorders a second 1343 array of PetscInts to match the first. 1344 1345 Not Collective 1346 1347 Input Parameter: 1348 . n - number of values 1349 1350 Input/Output Parameters: 1351 . arr1 - array of PetscReals to be sorted, modified on output 1352 - arr2 - array of PetscReals to be reordered, modified on output 1353 1354 Notes: 1355 This function serves as an alternative to PetscSortRealWithArray(). While this function works for any array of PetscReals it is 1356 significantly faster if the array is not totally random. There are exceptions to this and so it is __highly__ 1357 recommended that the user benchmark their code to see which routine is fastest. 1358 1359 Level: intermediate 1360 1361 .seealso: PetscTimSortWithArray(), PetscSortRealWithArrayInt(), PetscSortRealWithPermutation() 1362 @*/ 1363 PetscErrorCode PetscRealSortSemiOrderedWithArrayInt(PetscInt n, PetscReal arr1[], PetscInt arr2[]) 1364 { 1365 PetscErrorCode ierr; 1366 PetscFunctionBegin; 1367 if (n <= 1) PetscFunctionReturn(0); 1368 PetscValidRealPointer(arr1,2); 1369 PetscValidIntPointer(arr2,3); 1370 /* cannot export out to PetscRealSortWithArrayInt here since it isn't stable */ 1371 ierr = PetscTimSortWithArray(n, arr1, sizeof(PetscReal), arr2, sizeof(PetscInt), Compare_PetscReal_Private, NULL);CHKERRQ(ierr); 1372 PetscFunctionReturn(0); 1373 } 1374