1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994
|
/* pp_sort.c
*
* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
* 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* ...they shuffled back towards the rear of the line. 'No, not at the
* rear!' the slave-driver shouted. 'Three files up. And stay there...
*
* [p.931 of _The Lord of the Rings_, VI/ii: "The Land of Shadow"]
*/
/* This file contains pp ("push/pop") functions that
* execute the opcodes that make up a perl program. A typical pp function
* expects to find its arguments on the stack, and usually pushes its
* results onto the stack, hence the 'pp' terminology. Each OP structure
* contains a pointer to the relevant pp_foo() function.
*
* This particular file just contains pp_sort(), which is complex
* enough to merit its own file! See the other pp*.c files for the rest of
* the pp_ functions.
*/
#include "EXTERN.h"
#define PERL_IN_PP_SORT_C
#include "perl.h"
#if defined(UNDER_CE)
/* looks like 'small' is reserved word for WINCE (or somesuch)*/
#define small xsmall
#endif
#define sv_cmp_static Perl_sv_cmp
#define sv_cmp_locale_static Perl_sv_cmp_locale
#ifndef SMALLSORT
#define SMALLSORT (200)
#endif
/* Flags for qsortsv and mergesortsv */
#define SORTf_DESC 1
#define SORTf_STABLE 2
#define SORTf_QSORT 4
/*
* The mergesort implementation is by Peter M. Mcilroy <pmcilroy@lucent.com>.
*
* The original code was written in conjunction with BSD Computer Software
* Research Group at University of California, Berkeley.
*
* See also: "Optimistic Sorting and Information Theoretic Complexity"
* Peter McIlroy
* SODA (Fourth Annual ACM-SIAM Symposium on Discrete Algorithms),
* pp 467-474, Austin, Texas, 25-27 January 1993.
*
* The integration to Perl is by John P. Linderman <jpl.jpl@gmail.com>.
*
* The code can be distributed under the same terms as Perl itself.
*
*/
typedef char * aptr; /* pointer for arithmetic on sizes */
typedef SV * gptr; /* pointers in our lists */
/* Binary merge internal sort, with a few special mods
** for the special perl environment it now finds itself in.
**
** Things that were once options have been hotwired
** to values suitable for this use. In particular, we'll always
** initialize looking for natural runs, we'll always produce stable
** output, and we'll always do Peter McIlroy's binary merge.
*/
/* Pointer types for arithmetic and storage and convenience casts */
#define APTR(P) ((aptr)(P))
#define GPTP(P) ((gptr *)(P))
#define GPPP(P) ((gptr **)(P))
/* byte offset from pointer P to (larger) pointer Q */
#define BYTEOFF(P, Q) (APTR(Q) - APTR(P))
#define PSIZE sizeof(gptr)
/* If PSIZE is power of 2, make PSHIFT that power, if that helps */
#ifdef PSHIFT
#define PNELEM(P, Q) (BYTEOFF(P,Q) >> (PSHIFT))
#define PNBYTE(N) ((N) << (PSHIFT))
#define PINDEX(P, N) (GPTP(APTR(P) + PNBYTE(N)))
#else
/* Leave optimization to compiler */
#define PNELEM(P, Q) (GPTP(Q) - GPTP(P))
#define PNBYTE(N) ((N) * (PSIZE))
#define PINDEX(P, N) (GPTP(P) + (N))
#endif
/* Pointer into other corresponding to pointer into this */
#define POTHER(P, THIS, OTHER) GPTP(APTR(OTHER) + BYTEOFF(THIS,P))
#define FROMTOUPTO(src, dst, lim) do *dst++ = *src++; while(src<lim)
/* Runs are identified by a pointer in the auxiliary list.
** The pointer is at the start of the list,
** and it points to the start of the next list.
** NEXT is used as an lvalue, too.
*/
#define NEXT(P) (*GPPP(P))
/* PTHRESH is the minimum number of pairs with the same sense to justify
** checking for a run and extending it. Note that PTHRESH counts PAIRS,
** not just elements, so PTHRESH == 8 means a run of 16.
*/
#define PTHRESH (8)
/* RTHRESH is the number of elements in a run that must compare low
** to the low element from the opposing run before we justify
** doing a binary rampup instead of single stepping.
** In random input, N in a row low should only happen with
** probability 2^(1-N), so we can risk that we are dealing
** with orderly input without paying much when we aren't.
*/
#define RTHRESH (6)
/*
** Overview of algorithm and variables.
** The array of elements at list1 will be organized into runs of length 2,
** or runs of length >= 2 * PTHRESH. We only try to form long runs when
** PTHRESH adjacent pairs compare in the same way, suggesting overall order.
**
** Unless otherwise specified, pair pointers address the first of two elements.
**
** b and b+1 are a pair that compare with sense "sense".
** b is the "bottom" of adjacent pairs that might form a longer run.
**
** p2 parallels b in the list2 array, where runs are defined by
** a pointer chain.
**
** t represents the "top" of the adjacent pairs that might extend
** the run beginning at b. Usually, t addresses a pair
** that compares with opposite sense from (b,b+1).
** However, it may also address a singleton element at the end of list1,
** or it may be equal to "last", the first element beyond list1.
**
** r addresses the Nth pair following b. If this would be beyond t,
** we back it off to t. Only when r is less than t do we consider the
** run long enough to consider checking.
**
** q addresses a pair such that the pairs at b through q already form a run.
** Often, q will equal b, indicating we only are sure of the pair itself.
** However, a search on the previous cycle may have revealed a longer run,
** so q may be greater than b.
**
** p is used to work back from a candidate r, trying to reach q,
** which would mean b through r would be a run. If we discover such a run,
** we start q at r and try to push it further towards t.
** If b through r is NOT a run, we detect the wrong order at (p-1,p).
** In any event, after the check (if any), we have two main cases.
**
** 1) Short run. b <= q < p <= r <= t.
** b through q is a run (perhaps trivial)
** q through p are uninteresting pairs
** p through r is a run
**
** 2) Long run. b < r <= q < t.
** b through q is a run (of length >= 2 * PTHRESH)
**
** Note that degenerate cases are not only possible, but likely.
** For example, if the pair following b compares with opposite sense,
** then b == q < p == r == t.
*/
static IV
dynprep(pTHX_ gptr *list1, gptr *list2, size_t nmemb, const SVCOMPARE_t cmp)
{
I32 sense;
gptr *b, *p, *q, *t, *p2;
gptr *last, *r;
IV runs = 0;
b = list1;
last = PINDEX(b, nmemb);
sense = (cmp(aTHX_ *b, *(b+1)) > 0);
for (p2 = list2; b < last; ) {
/* We just started, or just reversed sense.
** Set t at end of pairs with the prevailing sense.
*/
for (p = b+2, t = p; ++p < last; t = ++p) {
if ((cmp(aTHX_ *t, *p) > 0) != sense) break;
}
q = b;
/* Having laid out the playing field, look for long runs */
do {
p = r = b + (2 * PTHRESH);
if (r >= t) p = r = t; /* too short to care about */
else {
while (((cmp(aTHX_ *(p-1), *p) > 0) == sense) &&
((p -= 2) > q)) {}
if (p <= q) {
/* b through r is a (long) run.
** Extend it as far as possible.
*/
p = q = r;
while (((p += 2) < t) &&
((cmp(aTHX_ *(p-1), *p) > 0) == sense)) q = p;
r = p = q + 2; /* no simple pairs, no after-run */
}
}
if (q > b) { /* run of greater than 2 at b */
gptr *savep = p;
p = q += 2;
/* pick up singleton, if possible */
if ((p == t) &&
((t + 1) == last) &&
((cmp(aTHX_ *(p-1), *p) > 0) == sense))
savep = r = p = q = last;
p2 = NEXT(p2) = p2 + (p - b); ++runs;
if (sense)
while (b < --p) {
const gptr c = *b;
*b++ = *p;
*p = c;
}
p = savep;
}
while (q < p) { /* simple pairs */
p2 = NEXT(p2) = p2 + 2; ++runs;
if (sense) {
const gptr c = *q++;
*(q-1) = *q;
*q++ = c;
} else q += 2;
}
if (((b = p) == t) && ((t+1) == last)) {
NEXT(p2) = p2 + 1; ++runs;
b++;
}
q = r;
} while (b < t);
sense = !sense;
}
return runs;
}
/* The original merge sort, in use since 5.7, was as fast as, or faster than,
* qsort on many platforms, but slower than qsort, conspicuously so,
* on others. The most likely explanation was platform-specific
* differences in cache sizes and relative speeds.
*
* The quicksort divide-and-conquer algorithm guarantees that, as the
* problem is subdivided into smaller and smaller parts, the parts
* fit into smaller (and faster) caches. So it doesn't matter how
* many levels of cache exist, quicksort will "find" them, and,
* as long as smaller is faster, take advantage of them.
*
* By contrast, consider how the original mergesort algorithm worked.
* Suppose we have five runs (each typically of length 2 after dynprep).
*
* pass base aux
* 0 1 2 3 4 5
* 1 12 34 5
* 2 1234 5
* 3 12345
* 4 12345
*
* Adjacent pairs are merged in "grand sweeps" through the input.
* This means, on pass 1, the records in runs 1 and 2 aren't revisited until
* runs 3 and 4 are merged and the runs from run 5 have been copied.
* The only cache that matters is one large enough to hold *all* the input.
* On some platforms, this may be many times slower than smaller caches.
*
* The following pseudo-code uses the same basic merge algorithm,
* but in a divide-and-conquer way.
*
* # merge $runs runs at offset $offset of list $list1 into $list2.
* # all unmerged runs ($runs == 1) originate in list $base.
* sub mgsort2 {
* my ($offset, $runs, $base, $list1, $list2) = @_;
*
* if ($runs == 1) {
* if ($list1 is $base) copy run to $list2
* return offset of end of list (or copy)
* } else {
* $off2 = mgsort2($offset, $runs-($runs/2), $base, $list2, $list1)
* mgsort2($off2, $runs/2, $base, $list2, $list1)
* merge the adjacent runs at $offset of $list1 into $list2
* return the offset of the end of the merged runs
* }
* }
* mgsort2(0, $runs, $base, $aux, $base);
*
* For our 5 runs, the tree of calls looks like
*
* 5
* 3 2
* 2 1 1 1
* 1 1
*
* 1 2 3 4 5
*
* and the corresponding activity looks like
*
* copy runs 1 and 2 from base to aux
* merge runs 1 and 2 from aux to base
* (run 3 is where it belongs, no copy needed)
* merge runs 12 and 3 from base to aux
* (runs 4 and 5 are where they belong, no copy needed)
* merge runs 4 and 5 from base to aux
* merge runs 123 and 45 from aux to base
*
* Note that we merge runs 1 and 2 immediately after copying them,
* while they are still likely to be in fast cache. Similarly,
* run 3 is merged with run 12 while it still may be lingering in cache.
* This implementation should therefore enjoy much of the cache-friendly
* behavior that quicksort does. In addition, it does less copying
* than the original mergesort implementation (only runs 1 and 2 are copied)
* and the "balancing" of merges is better (merged runs comprise more nearly
* equal numbers of original runs).
*
* The actual cache-friendly implementation will use a pseudo-stack
* to avoid recursion, and will unroll processing of runs of length 2,
* but it is otherwise similar to the recursive implementation.
*/
typedef struct {
IV offset; /* offset of 1st of 2 runs at this level */
IV runs; /* how many runs must be combined into 1 */
} off_runs; /* pseudo-stack element */
static I32
cmp_desc(pTHX_ gptr const a, gptr const b)
{
return -PL_sort_RealCmp(aTHX_ a, b);
}
STATIC void
S_mergesortsv(pTHX_ gptr *base, size_t nmemb, SVCOMPARE_t cmp, U32 flags)
{
IV i, run, offset;
I32 sense, level;
gptr *f1, *f2, *t, *b, *p;
int iwhich;
gptr *aux;
gptr *p1;
gptr small[SMALLSORT];
gptr *which[3];
off_runs stack[60], *stackp;
SVCOMPARE_t savecmp = NULL;
if (nmemb <= 1) return; /* sorted trivially */
if ((flags & SORTf_DESC) != 0) {
savecmp = PL_sort_RealCmp; /* Save current comparison routine, if any */
PL_sort_RealCmp = cmp; /* Put comparison routine where cmp_desc can find it */
cmp = cmp_desc;
}
if (nmemb <= SMALLSORT) aux = small; /* use stack for aux array */
else { Newx(aux,nmemb,gptr); } /* allocate auxiliary array */
level = 0;
stackp = stack;
stackp->runs = dynprep(aTHX_ base, aux, nmemb, cmp);
stackp->offset = offset = 0;
which[0] = which[2] = base;
which[1] = aux;
for (;;) {
/* On levels where both runs have be constructed (stackp->runs == 0),
* merge them, and note the offset of their end, in case the offset
* is needed at the next level up. Hop up a level, and,
* as long as stackp->runs is 0, keep merging.
*/
IV runs = stackp->runs;
if (runs == 0) {
gptr *list1, *list2;
iwhich = level & 1;
list1 = which[iwhich]; /* area where runs are now */
list2 = which[++iwhich]; /* area for merged runs */
do {
gptr *l1, *l2, *tp2;
offset = stackp->offset;
f1 = p1 = list1 + offset; /* start of first run */
p = tp2 = list2 + offset; /* where merged run will go */
t = NEXT(p); /* where first run ends */
f2 = l1 = POTHER(t, list2, list1); /* ... on the other side */
t = NEXT(t); /* where second runs ends */
l2 = POTHER(t, list2, list1); /* ... on the other side */
offset = PNELEM(list2, t);
while (f1 < l1 && f2 < l2) {
/* If head 1 is larger than head 2, find ALL the elements
** in list 2 strictly less than head1, write them all,
** then head 1. Then compare the new heads, and repeat,
** until one or both lists are exhausted.
**
** In all comparisons (after establishing
** which head to merge) the item to merge
** (at pointer q) is the first operand of
** the comparison. When we want to know
** if "q is strictly less than the other",
** we can't just do
** cmp(q, other) < 0
** because stability demands that we treat equality
** as high when q comes from l2, and as low when
** q was from l1. So we ask the question by doing
** cmp(q, other) <= sense
** and make sense == 0 when equality should look low,
** and -1 when equality should look high.
*/
gptr *q;
if (cmp(aTHX_ *f1, *f2) <= 0) {
q = f2; b = f1; t = l1;
sense = -1;
} else {
q = f1; b = f2; t = l2;
sense = 0;
}
/* ramp up
**
** Leave t at something strictly
** greater than q (or at the end of the list),
** and b at something strictly less than q.
*/
for (i = 1, run = 0 ;;) {
if ((p = PINDEX(b, i)) >= t) {
/* off the end */
if (((p = PINDEX(t, -1)) > b) &&
(cmp(aTHX_ *q, *p) <= sense))
t = p;
else b = p;
break;
} else if (cmp(aTHX_ *q, *p) <= sense) {
t = p;
break;
} else b = p;
if (++run >= RTHRESH) i += i;
}
/* q is known to follow b and must be inserted before t.
** Increment b, so the range of possibilities is [b,t).
** Round binary split down, to favor early appearance.
** Adjust b and t until q belongs just before t.
*/
b++;
while (b < t) {
p = PINDEX(b, (PNELEM(b, t) - 1) / 2);
if (cmp(aTHX_ *q, *p) <= sense) {
t = p;
} else b = p + 1;
}
/* Copy all the strictly low elements */
if (q == f1) {
FROMTOUPTO(f2, tp2, t);
*tp2++ = *f1++;
} else {
FROMTOUPTO(f1, tp2, t);
*tp2++ = *f2++;
}
}
/* Run out remaining list */
if (f1 == l1) {
if (f2 < l2) FROMTOUPTO(f2, tp2, l2);
} else FROMTOUPTO(f1, tp2, l1);
p1 = NEXT(p1) = POTHER(tp2, list2, list1);
if (--level == 0) goto done;
--stackp;
t = list1; list1 = list2; list2 = t; /* swap lists */
} while ((runs = stackp->runs) == 0);
}
stackp->runs = 0; /* current run will finish level */
/* While there are more than 2 runs remaining,
* turn them into exactly 2 runs (at the "other" level),
* each made up of approximately half the runs.
* Stack the second half for later processing,
* and set about producing the first half now.
*/
while (runs > 2) {
++level;
++stackp;
stackp->offset = offset;
runs -= stackp->runs = runs / 2;
}
/* We must construct a single run from 1 or 2 runs.
* All the original runs are in which[0] == base.
* The run we construct must end up in which[level&1].
*/
iwhich = level & 1;
if (runs == 1) {
/* Constructing a single run from a single run.
* If it's where it belongs already, there's nothing to do.
* Otherwise, copy it to where it belongs.
* A run of 1 is either a singleton at level 0,
* or the second half of a split 3. In neither event
* is it necessary to set offset. It will be set by the merge
* that immediately follows.
*/
if (iwhich) { /* Belongs in aux, currently in base */
f1 = b = PINDEX(base, offset); /* where list starts */
f2 = PINDEX(aux, offset); /* where list goes */
t = NEXT(f2); /* where list will end */
offset = PNELEM(aux, t); /* offset thereof */
t = PINDEX(base, offset); /* where it currently ends */
FROMTOUPTO(f1, f2, t); /* copy */
NEXT(b) = t; /* set up parallel pointer */
} else if (level == 0) goto done; /* single run at level 0 */
} else {
/* Constructing a single run from two runs.
* The merge code at the top will do that.
* We need only make sure the two runs are in the "other" array,
* so they'll end up in the correct array after the merge.
*/
++level;
++stackp;
stackp->offset = offset;
stackp->runs = 0; /* take care of both runs, trigger merge */
if (!iwhich) { /* Merged runs belong in aux, copy 1st */
f1 = b = PINDEX(base, offset); /* where first run starts */
f2 = PINDEX(aux, offset); /* where it will be copied */
t = NEXT(f2); /* where first run will end */
offset = PNELEM(aux, t); /* offset thereof */
p = PINDEX(base, offset); /* end of first run */
t = NEXT(t); /* where second run will end */
t = PINDEX(base, PNELEM(aux, t)); /* where it now ends */
FROMTOUPTO(f1, f2, t); /* copy both runs */
NEXT(b) = p; /* paralleled pointer for 1st */
NEXT(p) = t; /* ... and for second */
}
}
}
done:
if (aux != small) Safefree(aux); /* free iff allocated */
if (flags) {
PL_sort_RealCmp = savecmp; /* Restore current comparison routine, if any */
}
return;
}
/*
* The quicksort implementation was derived from source code contributed
* by Tom Horsley.
*
* NOTE: this code was derived from Tom Horsley's qsort replacement
* and should not be confused with the original code.
*/
/* Copyright (C) Tom Horsley, 1997. All rights reserved.
Permission granted to distribute under the same terms as perl which are
(briefly):
This program is free software; you can redistribute it and/or modify
it under the terms of either:
a) the GNU General Public License as published by the Free
Software Foundation; either version 1, or (at your option) any
later version, or
b) the "Artistic License" which comes with this Kit.
Details on the perl license can be found in the perl source code which
may be located via the www.perl.com web page.
This is the most wonderfulest possible qsort I can come up with (and
still be mostly portable) My (limited) tests indicate it consistently
does about 20% fewer calls to compare than does the qsort in the Visual
C++ library, other vendors may vary.
Some of the ideas in here can be found in "Algorithms" by Sedgewick,
others I invented myself (or more likely re-invented since they seemed
pretty obvious once I watched the algorithm operate for a while).
Most of this code was written while watching the Marlins sweep the Giants
in the 1997 National League Playoffs - no Braves fans allowed to use this
code (just kidding :-).
I realize that if I wanted to be true to the perl tradition, the only
comment in this file would be something like:
...they shuffled back towards the rear of the line. 'No, not at the
rear!' the slave-driver shouted. 'Three files up. And stay there...
However, I really needed to violate that tradition just so I could keep
track of what happens myself, not to mention some poor fool trying to
understand this years from now :-).
*/
/* ********************************************************** Configuration */
#ifndef QSORT_ORDER_GUESS
#define QSORT_ORDER_GUESS 2 /* Select doubling version of the netBSD trick */
#endif
/* QSORT_MAX_STACK is the largest number of partitions that can be stacked up for
future processing - a good max upper bound is log base 2 of memory size
(32 on 32 bit machines, 64 on 64 bit machines, etc). In reality can
safely be smaller than that since the program is taking up some space and
most operating systems only let you grab some subset of contiguous
memory (not to mention that you are normally sorting data larger than
1 byte element size :-).
*/
#ifndef QSORT_MAX_STACK
#define QSORT_MAX_STACK 32
#endif
/* QSORT_BREAK_EVEN is the size of the largest partition we should insertion sort.
Anything bigger and we use qsort. If you make this too small, the qsort
will probably break (or become less efficient), because it doesn't expect
the middle element of a partition to be the same as the right or left -
you have been warned).
*/
#ifndef QSORT_BREAK_EVEN
#define QSORT_BREAK_EVEN 6
#endif
/* QSORT_PLAY_SAFE is the size of the largest partition we're willing
to go quadratic on. We innoculate larger partitions against
quadratic behavior by shuffling them before sorting. This is not
an absolute guarantee of non-quadratic behavior, but it would take
staggeringly bad luck to pick extreme elements as the pivot
from randomized data.
*/
#ifndef QSORT_PLAY_SAFE
#define QSORT_PLAY_SAFE 255
#endif
/* ************************************************************* Data Types */
/* hold left and right index values of a partition waiting to be sorted (the
partition includes both left and right - right is NOT one past the end or
anything like that).
*/
struct partition_stack_entry {
int left;
int right;
#ifdef QSORT_ORDER_GUESS
int qsort_break_even;
#endif
};
/* ******************************************************* Shorthand Macros */
/* Note that these macros will be used from inside the qsort function where
we happen to know that the variable 'elt_size' contains the size of an
array element and the variable 'temp' points to enough space to hold a
temp element and the variable 'array' points to the array being sorted
and 'compare' is the pointer to the compare routine.
Also note that there are very many highly architecture specific ways
these might be sped up, but this is simply the most generally portable
code I could think of.
*/
/* Return < 0 == 0 or > 0 as the value of elt1 is < elt2, == elt2, > elt2
*/
#define qsort_cmp(elt1, elt2) \
((*compare)(aTHX_ array[elt1], array[elt2]))
#ifdef QSORT_ORDER_GUESS
#define QSORT_NOTICE_SWAP swapped++;
#else
#define QSORT_NOTICE_SWAP
#endif
/* swaps contents of array elements elt1, elt2.
*/
#define qsort_swap(elt1, elt2) \
STMT_START { \
QSORT_NOTICE_SWAP \
temp = array[elt1]; \
array[elt1] = array[elt2]; \
array[elt2] = temp; \
} STMT_END
/* rotate contents of elt1, elt2, elt3 such that elt1 gets elt2, elt2 gets
elt3 and elt3 gets elt1.
*/
#define qsort_rotate(elt1, elt2, elt3) \
STMT_START { \
QSORT_NOTICE_SWAP \
temp = array[elt1]; \
array[elt1] = array[elt2]; \
array[elt2] = array[elt3]; \
array[elt3] = temp; \
} STMT_END
/* ************************************************************ Debug stuff */
#ifdef QSORT_DEBUG
static void
break_here()
{
return; /* good place to set a breakpoint */
}
#define qsort_assert(t) (void)( (t) || (break_here(), 0) )
static void
doqsort_all_asserts(
void * array,
size_t num_elts,
size_t elt_size,
int (*compare)(const void * elt1, const void * elt2),
int pc_left, int pc_right, int u_left, int u_right)
{
int i;
qsort_assert(pc_left <= pc_right);
qsort_assert(u_right < pc_left);
qsort_assert(pc_right < u_left);
for (i = u_right + 1; i < pc_left; ++i) {
qsort_assert(qsort_cmp(i, pc_left) < 0);
}
for (i = pc_left; i < pc_right; ++i) {
qsort_assert(qsort_cmp(i, pc_right) == 0);
}
for (i = pc_right + 1; i < u_left; ++i) {
qsort_assert(qsort_cmp(pc_right, i) < 0);
}
}
#define qsort_all_asserts(PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT) \
doqsort_all_asserts(array, num_elts, elt_size, compare, \
PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT)
#else
#define qsort_assert(t) ((void)0)
#define qsort_all_asserts(PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT) ((void)0)
#endif
/* ****************************************************************** qsort */
STATIC void /* the standard unstable (u) quicksort (qsort) */
S_qsortsvu(pTHX_ SV ** array, size_t num_elts, SVCOMPARE_t compare)
{
SV * temp;
struct partition_stack_entry partition_stack[QSORT_MAX_STACK];
int next_stack_entry = 0;
int part_left;
int part_right;
#ifdef QSORT_ORDER_GUESS
int qsort_break_even;
int swapped;
#endif
PERL_ARGS_ASSERT_QSORTSVU;
/* Make sure we actually have work to do.
*/
if (num_elts <= 1) {
return;
}
/* Inoculate large partitions against quadratic behavior */
if (num_elts > QSORT_PLAY_SAFE) {
size_t n;
SV ** const q = array;
for (n = num_elts; n > 1; ) {
const size_t j = (size_t)(n-- * Drand01());
temp = q[j];
q[j] = q[n];
q[n] = temp;
}
}
/* Setup the initial partition definition and fall into the sorting loop
*/
part_left = 0;
part_right = (int)(num_elts - 1);
#ifdef QSORT_ORDER_GUESS
qsort_break_even = QSORT_BREAK_EVEN;
#else
#define qsort_break_even QSORT_BREAK_EVEN
#endif
for ( ; ; ) {
if ((part_right - part_left) >= qsort_break_even) {
/* OK, this is gonna get hairy, so lets try to document all the
concepts and abbreviations and variables and what they keep
track of:
pc: pivot chunk - the set of array elements we accumulate in the
middle of the partition, all equal in value to the original
pivot element selected. The pc is defined by:
pc_left - the leftmost array index of the pc
pc_right - the rightmost array index of the pc
we start with pc_left == pc_right and only one element
in the pivot chunk (but it can grow during the scan).
u: uncompared elements - the set of elements in the partition
we have not yet compared to the pivot value. There are two
uncompared sets during the scan - one to the left of the pc
and one to the right.
u_right - the rightmost index of the left side's uncompared set
u_left - the leftmost index of the right side's uncompared set
The leftmost index of the left sides's uncompared set
doesn't need its own variable because it is always defined
by the leftmost edge of the whole partition (part_left). The
same goes for the rightmost edge of the right partition
(part_right).
We know there are no uncompared elements on the left once we
get u_right < part_left and no uncompared elements on the
right once u_left > part_right. When both these conditions
are met, we have completed the scan of the partition.
Any elements which are between the pivot chunk and the
uncompared elements should be less than the pivot value on
the left side and greater than the pivot value on the right
side (in fact, the goal of the whole algorithm is to arrange
for that to be true and make the groups of less-than and
greater-then elements into new partitions to sort again).
As you marvel at the complexity of the code and wonder why it
has to be so confusing. Consider some of the things this level
of confusion brings:
Once I do a compare, I squeeze every ounce of juice out of it. I
never do compare calls I don't have to do, and I certainly never
do redundant calls.
I also never swap any elements unless I can prove there is a
good reason. Many sort algorithms will swap a known value with
an uncompared value just to get things in the right place (or
avoid complexity :-), but that uncompared value, once it gets
compared, may then have to be swapped again. A lot of the
complexity of this code is due to the fact that it never swaps
anything except compared values, and it only swaps them when the
compare shows they are out of position.
*/
int pc_left, pc_right;
int u_right, u_left;
int s;
pc_left = ((part_left + part_right) / 2);
pc_right = pc_left;
u_right = pc_left - 1;
u_left = pc_right + 1;
/* Qsort works best when the pivot value is also the median value
in the partition (unfortunately you can't find the median value
without first sorting :-), so to give the algorithm a helping
hand, we pick 3 elements and sort them and use the median value
of that tiny set as the pivot value.
Some versions of qsort like to use the left middle and right as
the 3 elements to sort so they can insure the ends of the
partition will contain values which will stop the scan in the
compare loop, but when you have to call an arbitrarily complex
routine to do a compare, its really better to just keep track of
array index values to know when you hit the edge of the
partition and avoid the extra compare. An even better reason to
avoid using a compare call is the fact that you can drop off the
edge of the array if someone foolishly provides you with an
unstable compare function that doesn't always provide consistent
results.
So, since it is simpler for us to compare the three adjacent
elements in the middle of the partition, those are the ones we
pick here (conveniently pointed at by u_right, pc_left, and
u_left). The values of the left, center, and right elements
are referred to as l c and r in the following comments.
*/
#ifdef QSORT_ORDER_GUESS
swapped = 0;
#endif
s = qsort_cmp(u_right, pc_left);
if (s < 0) {
/* l < c */
s = qsort_cmp(pc_left, u_left);
/* if l < c, c < r - already in order - nothing to do */
if (s == 0) {
/* l < c, c == r - already in order, pc grows */
++pc_right;
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
} else if (s > 0) {
/* l < c, c > r - need to know more */
s = qsort_cmp(u_right, u_left);
if (s < 0) {
/* l < c, c > r, l < r - swap c & r to get ordered */
qsort_swap(pc_left, u_left);
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
} else if (s == 0) {
/* l < c, c > r, l == r - swap c&r, grow pc */
qsort_swap(pc_left, u_left);
--pc_left;
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
} else {
/* l < c, c > r, l > r - make lcr into rlc to get ordered */
qsort_rotate(pc_left, u_right, u_left);
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
}
}
} else if (s == 0) {
/* l == c */
s = qsort_cmp(pc_left, u_left);
if (s < 0) {
/* l == c, c < r - already in order, grow pc */
--pc_left;
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
} else if (s == 0) {
/* l == c, c == r - already in order, grow pc both ways */
--pc_left;
++pc_right;
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
} else {
/* l == c, c > r - swap l & r, grow pc */
qsort_swap(u_right, u_left);
++pc_right;
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
}
} else {
/* l > c */
s = qsort_cmp(pc_left, u_left);
if (s < 0) {
/* l > c, c < r - need to know more */
s = qsort_cmp(u_right, u_left);
if (s < 0) {
/* l > c, c < r, l < r - swap l & c to get ordered */
qsort_swap(u_right, pc_left);
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
} else if (s == 0) {
/* l > c, c < r, l == r - swap l & c, grow pc */
qsort_swap(u_right, pc_left);
++pc_right;
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
} else {
/* l > c, c < r, l > r - rotate lcr into crl to order */
qsort_rotate(u_right, pc_left, u_left);
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
}
} else if (s == 0) {
/* l > c, c == r - swap ends, grow pc */
qsort_swap(u_right, u_left);
--pc_left;
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
} else {
/* l > c, c > r - swap ends to get in order */
qsort_swap(u_right, u_left);
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
}
}
/* We now know the 3 middle elements have been compared and
arranged in the desired order, so we can shrink the uncompared
sets on both sides
*/
--u_right;
++u_left;
qsort_all_asserts(pc_left, pc_right, u_left, u_right);
/* The above massive nested if was the simple part :-). We now have
the middle 3 elements ordered and we need to scan through the
uncompared sets on either side, swapping elements that are on
the wrong side or simply shuffling equal elements around to get
all equal elements into the pivot chunk.
*/
for ( ; ; ) {
int still_work_on_left;
int still_work_on_right;
/* Scan the uncompared values on the left. If I find a value
equal to the pivot value, move it over so it is adjacent to
the pivot chunk and expand the pivot chunk. If I find a value
less than the pivot value, then just leave it - its already
on the correct side of the partition. If I find a greater
value, then stop the scan.
*/
while ((still_work_on_left = (u_right >= part_left))) {
s = qsort_cmp(u_right, pc_left);
if (s < 0) {
--u_right;
} else if (s == 0) {
--pc_left;
if (pc_left != u_right) {
qsort_swap(u_right, pc_left);
}
--u_right;
} else {
break;
}
qsort_assert(u_right < pc_left);
qsort_assert(pc_left <= pc_right);
qsort_assert(qsort_cmp(u_right + 1, pc_left) <= 0);
qsort_assert(qsort_cmp(pc_left, pc_right) == 0);
}
/* Do a mirror image scan of uncompared values on the right
*/
while ((still_work_on_right = (u_left <= part_right))) {
s = qsort_cmp(pc_right, u_left);
if (s < 0) {
++u_left;
} else if (s == 0) {
++pc_right;
if (pc_right != u_left) {
qsort_swap(pc_right, u_left);
}
++u_left;
} else {
break;
}
qsort_assert(u_left > pc_right);
qsort_assert(pc_left <= pc_right);
qsort_assert(qsort_cmp(pc_right, u_left - 1) <= 0);
qsort_assert(qsort_cmp(pc_left, pc_right) == 0);
}
if (still_work_on_left) {
/* I know I have a value on the left side which needs to be
on the right side, but I need to know more to decide
exactly the best thing to do with it.
*/
if (still_work_on_right) {
/* I know I have values on both side which are out of
position. This is a big win because I kill two birds
with one swap (so to speak). I can advance the
uncompared pointers on both sides after swapping both
of them into the right place.
*/
qsort_swap(u_right, u_left);
--u_right;
++u_left;
qsort_all_asserts(pc_left, pc_right, u_left, u_right);
} else {
/* I have an out of position value on the left, but the
right is fully scanned, so I "slide" the pivot chunk
and any less-than values left one to make room for the
greater value over on the right. If the out of position
value is immediately adjacent to the pivot chunk (there
are no less-than values), I can do that with a swap,
otherwise, I have to rotate one of the less than values
into the former position of the out of position value
and the right end of the pivot chunk into the left end
(got all that?).
*/
--pc_left;
if (pc_left == u_right) {
qsort_swap(u_right, pc_right);
qsort_all_asserts(pc_left, pc_right-1, u_left, u_right-1);
} else {
qsort_rotate(u_right, pc_left, pc_right);
qsort_all_asserts(pc_left, pc_right-1, u_left, u_right-1);
}
--pc_right;
--u_right;
}
} else if (still_work_on_right) {
/* Mirror image of complex case above: I have an out of
position value on the right, but the left is fully
scanned, so I need to shuffle things around to make room
for the right value on the left.
*/
++pc_right;
if (pc_right == u_left) {
qsort_swap(u_left, pc_left);
qsort_all_asserts(pc_left+1, pc_right, u_left+1, u_right);
} else {
qsort_rotate(pc_right, pc_left, u_left);
qsort_all_asserts(pc_left+1, pc_right, u_left+1, u_right);
}
++pc_left;
++u_left;
} else {
/* No more scanning required on either side of partition,
break out of loop and figure out next set of partitions
*/
break;
}
}
/* The elements in the pivot chunk are now in the right place. They
will never move or be compared again. All I have to do is decide
what to do with the stuff to the left and right of the pivot
chunk.
Notes on the QSORT_ORDER_GUESS ifdef code:
1. If I just built these partitions without swapping any (or
very many) elements, there is a chance that the elements are
already ordered properly (being properly ordered will
certainly result in no swapping, but the converse can't be
proved :-).
2. A (properly written) insertion sort will run faster on
already ordered data than qsort will.
3. Perhaps there is some way to make a good guess about
switching to an insertion sort earlier than partition size 6
(for instance - we could save the partition size on the stack
and increase the size each time we find we didn't swap, thus
switching to insertion sort earlier for partitions with a
history of not swapping).
4. Naturally, if I just switch right away, it will make
artificial benchmarks with pure ascending (or descending)
data look really good, but is that a good reason in general?
Hard to say...
*/
#ifdef QSORT_ORDER_GUESS
if (swapped < 3) {
#if QSORT_ORDER_GUESS == 1
qsort_break_even = (part_right - part_left) + 1;
#endif
#if QSORT_ORDER_GUESS == 2
qsort_break_even *= 2;
#endif
#if QSORT_ORDER_GUESS == 3
const int prev_break = qsort_break_even;
qsort_break_even *= qsort_break_even;
if (qsort_break_even < prev_break) {
qsort_break_even = (part_right - part_left) + 1;
}
#endif
} else {
qsort_break_even = QSORT_BREAK_EVEN;
}
#endif
if (part_left < pc_left) {
/* There are elements on the left which need more processing.
Check the right as well before deciding what to do.
*/
if (pc_right < part_right) {
/* We have two partitions to be sorted. Stack the biggest one
and process the smallest one on the next iteration. This
minimizes the stack height by insuring that any additional
stack entries must come from the smallest partition which
(because it is smallest) will have the fewest
opportunities to generate additional stack entries.
*/
if ((part_right - pc_right) > (pc_left - part_left)) {
/* stack the right partition, process the left */
partition_stack[next_stack_entry].left = pc_right + 1;
partition_stack[next_stack_entry].right = part_right;
#ifdef QSORT_ORDER_GUESS
partition_stack[next_stack_entry].qsort_break_even = qsort_break_even;
#endif
part_right = pc_left - 1;
} else {
/* stack the left partition, process the right */
partition_stack[next_stack_entry].left = part_left;
partition_stack[next_stack_entry].right = pc_left - 1;
#ifdef QSORT_ORDER_GUESS
partition_stack[next_stack_entry].qsort_break_even = qsort_break_even;
#endif
part_left = pc_right + 1;
}
qsort_assert(next_stack_entry < QSORT_MAX_STACK);
++next_stack_entry;
} else {
/* The elements on the left are the only remaining elements
that need sorting, arrange for them to be processed as the
next partition.
*/
part_right = pc_left - 1;
}
} else if (pc_right < part_right) {
/* There is only one chunk on the right to be sorted, make it
the new partition and loop back around.
*/
part_left = pc_right + 1;
} else {
/* This whole partition wound up in the pivot chunk, so
we need to get a new partition off the stack.
*/
if (next_stack_entry == 0) {
/* the stack is empty - we are done */
break;
}
--next_stack_entry;
part_left = partition_stack[next_stack_entry].left;
part_right = partition_stack[next_stack_entry].right;
#ifdef QSORT_ORDER_GUESS
qsort_break_even = partition_stack[next_stack_entry].qsort_break_even;
#endif
}
} else {
/* This partition is too small to fool with qsort complexity, just
do an ordinary insertion sort to minimize overhead.
*/
int i;
/* Assume 1st element is in right place already, and start checking
at 2nd element to see where it should be inserted.
*/
for (i = part_left + 1; i <= part_right; ++i) {
int j;
/* Scan (backwards - just in case 'i' is already in right place)
through the elements already sorted to see if the ith element
belongs ahead of one of them.
*/
for (j = i - 1; j >= part_left; --j) {
if (qsort_cmp(i, j) >= 0) {
/* i belongs right after j
*/
break;
}
}
++j;
if (j != i) {
/* Looks like we really need to move some things
*/
int k;
temp = array[i];
for (k = i - 1; k >= j; --k)
array[k + 1] = array[k];
array[j] = temp;
}
}
/* That partition is now sorted, grab the next one, or get out
of the loop if there aren't any more.
*/
if (next_stack_entry == 0) {
/* the stack is empty - we are done */
break;
}
--next_stack_entry;
part_left = partition_stack[next_stack_entry].left;
part_right = partition_stack[next_stack_entry].right;
#ifdef QSORT_ORDER_GUESS
qsort_break_even = partition_stack[next_stack_entry].qsort_break_even;
#endif
}
}
/* Believe it or not, the array is sorted at this point! */
}
/* Stabilize what is, presumably, an otherwise unstable sort method.
* We do that by allocating (or having on hand) an array of pointers
* that is the same size as the original array of elements to be sorted.
* We initialize this parallel array with the addresses of the original
* array elements. This indirection can make you crazy.
* Some pictures can help. After initializing, we have
*
* indir list1
* +----+ +----+
* | | --------------> | | ------> first element to be sorted
* +----+ +----+
* | | --------------> | | ------> second element to be sorted
* +----+ +----+
* | | --------------> | | ------> third element to be sorted
* +----+ +----+
* ...
* +----+ +----+
* | | --------------> | | ------> n-1st element to be sorted
* +----+ +----+
* | | --------------> | | ------> n-th element to be sorted
* +----+ +----+
*
* During the sort phase, we leave the elements of list1 where they are,
* and sort the pointers in the indirect array in the same order determined
* by the original comparison routine on the elements pointed to.
* Because we don't move the elements of list1 around through
* this phase, we can break ties on elements that compare equal
* using their address in the list1 array, ensuring stability.
* This leaves us with something looking like
*
* indir list1
* +----+ +----+
* | | --+ +---> | | ------> first element to be sorted
* +----+ | | +----+
* | | --|-------|---> | | ------> second element to be sorted
* +----+ | | +----+
* | | --|-------+ +-> | | ------> third element to be sorted
* +----+ | | +----+
* ...
* +----+ | | | | +----+
* | | ---|-+ | +--> | | ------> n-1st element to be sorted
* +----+ | | +----+
* | | ---+ +----> | | ------> n-th element to be sorted
* +----+ +----+
*
* where the i-th element of the indirect array points to the element
* that should be i-th in the sorted array. After the sort phase,
* we have to put the elements of list1 into the places
* dictated by the indirect array.
*/
static I32
cmpindir(pTHX_ gptr const a, gptr const b)
{
gptr * const ap = (gptr *)a;
gptr * const bp = (gptr *)b;
const I32 sense = PL_sort_RealCmp(aTHX_ *ap, *bp);
if (sense)
return sense;
return (ap > bp) ? 1 : ((ap < bp) ? -1 : 0);
}
static I32
cmpindir_desc(pTHX_ gptr const a, gptr const b)
{
gptr * const ap = (gptr *)a;
gptr * const bp = (gptr *)b;
const I32 sense = PL_sort_RealCmp(aTHX_ *ap, *bp);
/* Reverse the default */
if (sense)
return -sense;
/* But don't reverse the stability test. */
return (ap > bp) ? 1 : ((ap < bp) ? -1 : 0);
}
STATIC void
S_qsortsv(pTHX_ gptr *list1, size_t nmemb, SVCOMPARE_t cmp, U32 flags)
{
if ((flags & SORTf_STABLE) != 0) {
gptr **pp, *q;
size_t n, j, i;
gptr *small[SMALLSORT], **indir, tmp;
SVCOMPARE_t savecmp;
if (nmemb <= 1) return; /* sorted trivially */
/* Small arrays can use the stack, big ones must be allocated */
if (nmemb <= SMALLSORT) indir = small;
else { Newx(indir, nmemb, gptr *); }
/* Copy pointers to original array elements into indirect array */
for (n = nmemb, pp = indir, q = list1; n--; ) *pp++ = q++;
savecmp = PL_sort_RealCmp; /* Save current comparison routine, if any */
PL_sort_RealCmp = cmp; /* Put comparison routine where cmpindir can find it */
/* sort, with indirection */
if (flags & SORTf_DESC)
qsortsvu((gptr *)indir, nmemb, cmpindir_desc);
else
qsortsvu((gptr *)indir, nmemb, cmpindir);
pp = indir;
q = list1;
for (n = nmemb; n--; ) {
/* Assert A: all elements of q with index > n are already
* in place. This is vacuously true at the start, and we
* put element n where it belongs below (if it wasn't
* already where it belonged). Assert B: we only move
* elements that aren't where they belong,
* so, by A, we never tamper with elements above n.
*/
j = pp[n] - q; /* This sets j so that q[j] is
* at pp[n]. *pp[j] belongs in
* q[j], by construction.
*/
if (n != j) { /* all's well if n == j */
tmp = q[j]; /* save what's in q[j] */
do {
q[j] = *pp[j]; /* put *pp[j] where it belongs */
i = pp[j] - q; /* the index in q of the element
* just moved */
pp[j] = q + j; /* this is ok now */
} while ((j = i) != n);
/* There are only finitely many (nmemb) addresses
* in the pp array.
* So we must eventually revisit an index we saw before.
* Suppose the first revisited index is k != n.
* An index is visited because something else belongs there.
* If we visit k twice, then two different elements must
* belong in the same place, which cannot be.
* So j must get back to n, the loop terminates,
* and we put the saved element where it belongs.
*/
q[n] = tmp; /* put what belongs into
* the n-th element */
}
}
/* free iff allocated */
if (indir != small) { Safefree(indir); }
/* restore prevailing comparison routine */
PL_sort_RealCmp = savecmp;
} else if ((flags & SORTf_DESC) != 0) {
const SVCOMPARE_t savecmp = PL_sort_RealCmp; /* Save current comparison routine, if any */
PL_sort_RealCmp = cmp; /* Put comparison routine where cmp_desc can find it */
cmp = cmp_desc;
qsortsvu(list1, nmemb, cmp);
/* restore prevailing comparison routine */
PL_sort_RealCmp = savecmp;
} else {
qsortsvu(list1, nmemb, cmp);
}
}
/*
=head1 Array Manipulation Functions
=for apidoc sortsv
Sort an array. Here is an example:
sortsv(AvARRAY(av), av_top_index(av)+1, Perl_sv_cmp_locale);
Currently this always uses mergesort. See C<L</sortsv_flags>> for a more
flexible routine.
=cut
*/
void
Perl_sortsv(pTHX_ SV **array, size_t nmemb, SVCOMPARE_t cmp)
{
PERL_ARGS_ASSERT_SORTSV;
sortsv_flags(array, nmemb, cmp, 0);
}
/*
=for apidoc sortsv_flags
Sort an array, with various options.
=cut
*/
void
Perl_sortsv_flags(pTHX_ SV **array, size_t nmemb, SVCOMPARE_t cmp, U32 flags)
{
PERL_ARGS_ASSERT_SORTSV_FLAGS;
if (flags & SORTf_QSORT)
S_qsortsv(aTHX_ array, nmemb, cmp, flags);
else
S_mergesortsv(aTHX_ array, nmemb, cmp, flags);
}
#define SvNSIOK(sv) ((SvFLAGS(sv) & SVf_NOK) || ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) == SVf_IOK))
#define SvSIOK(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) == SVf_IOK)
#define SvNSIV(sv) ( SvNOK(sv) ? SvNVX(sv) : ( SvSIOK(sv) ? SvIVX(sv) : sv_2nv(sv) ) )
PP(pp_sort)
{
dSP; dMARK; dORIGMARK;
SV **p1 = ORIGMARK+1, **p2;
SSize_t max, i;
AV* av = NULL;
GV *gv;
CV *cv = NULL;
U8 gimme = GIMME_V;
OP* const nextop = PL_op->op_next;
I32 overloading = 0;
bool hasargs = FALSE;
bool copytmps;
I32 is_xsub = 0;
I32 sorting_av = 0;
const U8 priv = PL_op->op_private;
const U8 flags = PL_op->op_flags;
U32 sort_flags = 0;
void (*sortsvp)(pTHX_ SV **array, size_t nmemb, SVCOMPARE_t cmp, U32 flags)
= Perl_sortsv_flags;
I32 all_SIVs = 1;
if ((priv & OPpSORT_DESCEND) != 0)
sort_flags |= SORTf_DESC;
if ((priv & OPpSORT_QSORT) != 0)
sort_flags |= SORTf_QSORT;
if ((priv & OPpSORT_STABLE) != 0)
sort_flags |= SORTf_STABLE;
if (gimme != G_ARRAY) {
SP = MARK;
EXTEND(SP,1);
RETPUSHUNDEF;
}
ENTER;
SAVEVPTR(PL_sortcop);
if (flags & OPf_STACKED) {
if (flags & OPf_SPECIAL) {
OP *nullop = OpSIBLING(cLISTOP->op_first); /* pass pushmark */
assert(nullop->op_type == OP_NULL);
PL_sortcop = nullop->op_next;
}
else {
GV *autogv = NULL;
HV *stash;
cv = sv_2cv(*++MARK, &stash, &gv, GV_ADD);
check_cv:
if (cv && SvPOK(cv)) {
const char * const proto = SvPV_nolen_const(MUTABLE_SV(cv));
if (proto && strEQ(proto, "$$")) {
hasargs = TRUE;
}
}
if (cv && CvISXSUB(cv) && CvXSUB(cv)) {
is_xsub = 1;
}
else if (!(cv && CvROOT(cv))) {
if (gv) {
goto autoload;
}
else if (!CvANON(cv) && (gv = CvGV(cv))) {
if (cv != GvCV(gv)) cv = GvCV(gv);
autoload:
if (!autogv && (
autogv = gv_autoload_pvn(
GvSTASH(gv), GvNAME(gv), GvNAMELEN(gv),
GvNAMEUTF8(gv) ? SVf_UTF8 : 0
)
)) {
cv = GvCVu(autogv);
goto check_cv;
}
else {
SV *tmpstr = sv_newmortal();
gv_efullname3(tmpstr, gv, NULL);
DIE(aTHX_ "Undefined sort subroutine \"%"SVf"\" called",
SVfARG(tmpstr));
}
}
else {
DIE(aTHX_ "Undefined subroutine in sort");
}
}
if (is_xsub)
PL_sortcop = (OP*)cv;
else
PL_sortcop = CvSTART(cv);
}
}
else {
PL_sortcop = NULL;
}
/* optimiser converts "@a = sort @a" to "sort \@a";
* in case of tied @a, pessimise: push (@a) onto stack, then assign
* result back to @a at the end of this function */
if (priv & OPpSORT_INPLACE) {
assert( MARK+1 == SP && *SP && SvTYPE(*SP) == SVt_PVAV);
(void)POPMARK; /* remove mark associated with ex-OP_AASSIGN */
av = MUTABLE_AV((*SP));
max = AvFILL(av) + 1;
if (SvMAGICAL(av)) {
MEXTEND(SP, max);
for (i=0; i < max; i++) {
SV **svp = av_fetch(av, i, FALSE);
*SP++ = (svp) ? *svp : NULL;
}
SP--;
p1 = p2 = SP - (max-1);
}
else {
if (SvREADONLY(av))
Perl_croak_no_modify();
else
{
SvREADONLY_on(av);
save_pushptr((void *)av, SAVEt_READONLY_OFF);
}
p1 = p2 = AvARRAY(av);
sorting_av = 1;
}
}
else {
p2 = MARK+1;
max = SP - MARK;
}
/* shuffle stack down, removing optional initial cv (p1!=p2), plus
* any nulls; also stringify or converting to integer or number as
* required any args */
copytmps = !sorting_av && PL_sortcop;
for (i=max; i > 0 ; i--) {
if ((*p1 = *p2++)) { /* Weed out nulls. */
if (copytmps && SvPADTMP(*p1)) {
*p1 = sv_mortalcopy(*p1);
}
SvTEMP_off(*p1);
if (!PL_sortcop) {
if (priv & OPpSORT_NUMERIC) {
if (priv & OPpSORT_INTEGER) {
if (!SvIOK(*p1))
(void)sv_2iv_flags(*p1, SV_GMAGIC|SV_SKIP_OVERLOAD);
}
else {
if (!SvNSIOK(*p1))
(void)sv_2nv_flags(*p1, SV_GMAGIC|SV_SKIP_OVERLOAD);
if (all_SIVs && !SvSIOK(*p1))
all_SIVs = 0;
}
}
else {
if (!SvPOK(*p1))
(void)sv_2pv_flags(*p1, 0,
SV_GMAGIC|SV_CONST_RETURN|SV_SKIP_OVERLOAD);
}
if (SvAMAGIC(*p1))
overloading = 1;
}
p1++;
}
else
max--;
}
if (sorting_av)
AvFILLp(av) = max-1;
if (max > 1) {
SV **start;
if (PL_sortcop) {
PERL_CONTEXT *cx;
const bool oldcatch = CATCH_GET;
I32 old_savestack_ix = PL_savestack_ix;
SAVEOP();
CATCH_SET(TRUE);
PUSHSTACKi(PERLSI_SORT);
if (!hasargs && !is_xsub) {
SAVEGENERICSV(PL_firstgv);
SAVEGENERICSV(PL_secondgv);
PL_firstgv = MUTABLE_GV(SvREFCNT_inc(
gv_fetchpvs("a", GV_ADD|GV_NOTQUAL, SVt_PV)
));
PL_secondgv = MUTABLE_GV(SvREFCNT_inc(
gv_fetchpvs("b", GV_ADD|GV_NOTQUAL, SVt_PV)
));
/* make sure the GP isn't removed out from under us for
* the SAVESPTR() */
save_gp(PL_firstgv, 0);
save_gp(PL_secondgv, 0);
/* we don't want modifications localized */
GvINTRO_off(PL_firstgv);
GvINTRO_off(PL_secondgv);
SAVESPTR(GvSV(PL_firstgv));
SAVESPTR(GvSV(PL_secondgv));
}
gimme = G_SCALAR;
cx = cx_pushblock(CXt_NULL, gimme, PL_stack_base, old_savestack_ix);
if (!(flags & OPf_SPECIAL)) {
cx->cx_type = CXt_SUB|CXp_MULTICALL;
cx_pushsub(cx, cv, NULL, hasargs);
if (!is_xsub) {
PADLIST * const padlist = CvPADLIST(cv);
if (++CvDEPTH(cv) >= 2)
pad_push(padlist, CvDEPTH(cv));
PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));
if (hasargs) {
/* This is mostly copied from pp_entersub */
AV * const av = MUTABLE_AV(PAD_SVl(0));
cx->blk_sub.savearray = GvAV(PL_defgv);
GvAV(PL_defgv) = MUTABLE_AV(SvREFCNT_inc_simple(av));
}
}
}
start = p1 - max;
sortsvp(aTHX_ start, max,
(is_xsub ? S_sortcv_xsub : hasargs ? S_sortcv_stacked : S_sortcv),
sort_flags);
/* Reset cx, in case the context stack has been reallocated. */
cx = CX_CUR();
PL_stack_sp = PL_stack_base + cx->blk_oldsp;
CX_LEAVE_SCOPE(cx);
if (!(flags & OPf_SPECIAL)) {
assert(CxTYPE(cx) == CXt_SUB);
cx_popsub(cx);
}
else
assert(CxTYPE(cx) == CXt_NULL);
/* there isn't a POPNULL ! */
cx_popblock(cx);
CX_POP(cx);
POPSTACK;
CATCH_SET(oldcatch);
}
else {
MEXTEND(SP, 20); /* Can't afford stack realloc on signal. */
start = sorting_av ? AvARRAY(av) : ORIGMARK+1;
sortsvp(aTHX_ start, max,
(priv & OPpSORT_NUMERIC)
? ( ( ( priv & OPpSORT_INTEGER) || all_SIVs)
? ( overloading ? S_amagic_i_ncmp : S_sv_i_ncmp)
: ( overloading ? S_amagic_ncmp : S_sv_ncmp ) )
: (
#ifdef USE_LOCALE_COLLATE
IN_LC_RUNTIME(LC_COLLATE)
? ( overloading
? (SVCOMPARE_t)S_amagic_cmp_locale
: (SVCOMPARE_t)sv_cmp_locale_static)
:
#endif
( overloading ? (SVCOMPARE_t)S_amagic_cmp : (SVCOMPARE_t)sv_cmp_static)),
sort_flags);
}
if ((priv & OPpSORT_REVERSE) != 0) {
SV **q = start+max-1;
while (start < q) {
SV * const tmp = *start;
*start++ = *q;
*q-- = tmp;
}
}
}
if (sorting_av)
SvREADONLY_off(av);
else if (av && !sorting_av) {
/* simulate pp_aassign of tied AV */
SV** const base = MARK+1;
for (i=0; i < max; i++) {
base[i] = newSVsv(base[i]);
}
av_clear(av);
av_extend(av, max);
for (i=0; i < max; i++) {
SV * const sv = base[i];
SV ** const didstore = av_store(av, i, sv);
if (SvSMAGICAL(sv))
mg_set(sv);
if (!didstore)
sv_2mortal(sv);
}
}
LEAVE;
PL_stack_sp = ORIGMARK + (sorting_av ? 0 : max);
return nextop;
}
static I32
S_sortcv(pTHX_ SV *const a, SV *const b)
{
const I32 oldsaveix = PL_savestack_ix;
I32 result;
PMOP * const pm = PL_curpm;
COP * const cop = PL_curcop;
PERL_ARGS_ASSERT_SORTCV;
GvSV(PL_firstgv) = a;
GvSV(PL_secondgv) = b;
PL_stack_sp = PL_stack_base;
PL_op = PL_sortcop;
CALLRUNOPS(aTHX);
PL_curcop = cop;
/* entry zero of a stack is always PL_sv_undef, which
* simplifies converting a '()' return into undef in scalar context */
assert(PL_stack_sp > PL_stack_base || *PL_stack_base == &PL_sv_undef);
result = SvIV(*PL_stack_sp);
LEAVE_SCOPE(oldsaveix);
PL_curpm = pm;
return result;
}
static I32
S_sortcv_stacked(pTHX_ SV *const a, SV *const b)
{
const I32 oldsaveix = PL_savestack_ix;
I32 result;
AV * const av = GvAV(PL_defgv);
PMOP * const pm = PL_curpm;
COP * const cop = PL_curcop;
PERL_ARGS_ASSERT_SORTCV_STACKED;
if (AvREAL(av)) {
av_clear(av);
AvREAL_off(av);
AvREIFY_on(av);
}
if (AvMAX(av) < 1) {
SV **ary = AvALLOC(av);
if (AvARRAY(av) != ary) {
AvMAX(av) += AvARRAY(av) - AvALLOC(av);
AvARRAY(av) = ary;
}
if (AvMAX(av) < 1) {
AvMAX(av) = 1;
Renew(ary,2,SV*);
AvARRAY(av) = ary;
AvALLOC(av) = ary;
}
}
AvFILLp(av) = 1;
AvARRAY(av)[0] = a;
AvARRAY(av)[1] = b;
PL_stack_sp = PL_stack_base;
PL_op = PL_sortcop;
CALLRUNOPS(aTHX);
PL_curcop = cop;
/* entry zero of a stack is always PL_sv_undef, which
* simplifies converting a '()' return into undef in scalar context */
assert(PL_stack_sp > PL_stack_base || *PL_stack_base == &PL_sv_undef);
result = SvIV(*PL_stack_sp);
LEAVE_SCOPE(oldsaveix);
PL_curpm = pm;
return result;
}
static I32
S_sortcv_xsub(pTHX_ SV *const a, SV *const b)
{
dSP;
const I32 oldsaveix = PL_savestack_ix;
CV * const cv=MUTABLE_CV(PL_sortcop);
I32 result;
PMOP * const pm = PL_curpm;
PERL_ARGS_ASSERT_SORTCV_XSUB;
SP = PL_stack_base;
PUSHMARK(SP);
EXTEND(SP, 2);
*++SP = a;
*++SP = b;
PUTBACK;
(void)(*CvXSUB(cv))(aTHX_ cv);
/* entry zero of a stack is always PL_sv_undef, which
* simplifies converting a '()' return into undef in scalar context */
assert(PL_stack_sp > PL_stack_base || *PL_stack_base == &PL_sv_undef);
result = SvIV(*PL_stack_sp);
LEAVE_SCOPE(oldsaveix);
PL_curpm = pm;
return result;
}
static I32
S_sv_ncmp(pTHX_ SV *const a, SV *const b)
{
const NV nv1 = SvNSIV(a);
const NV nv2 = SvNSIV(b);
PERL_ARGS_ASSERT_SV_NCMP;
#if defined(NAN_COMPARE_BROKEN) && defined(Perl_isnan)
if (Perl_isnan(nv1) || Perl_isnan(nv2)) {
#else
if (nv1 != nv1 || nv2 != nv2) {
#endif
if (ckWARN(WARN_UNINITIALIZED)) report_uninit(NULL);
return 0;
}
return nv1 < nv2 ? -1 : nv1 > nv2 ? 1 : 0;
}
static I32
S_sv_i_ncmp(pTHX_ SV *const a, SV *const b)
{
const IV iv1 = SvIV(a);
const IV iv2 = SvIV(b);
PERL_ARGS_ASSERT_SV_I_NCMP;
return iv1 < iv2 ? -1 : iv1 > iv2 ? 1 : 0;
}
#define tryCALL_AMAGICbin(left,right,meth) \
(SvAMAGIC(left)||SvAMAGIC(right)) \
? amagic_call(left, right, meth, 0) \
: NULL;
#define SORT_NORMAL_RETURN_VALUE(val) (((val) > 0) ? 1 : ((val) ? -1 : 0))
static I32
S_amagic_ncmp(pTHX_ SV *const a, SV *const b)
{
SV * const tmpsv = tryCALL_AMAGICbin(a,b,ncmp_amg);
PERL_ARGS_ASSERT_AMAGIC_NCMP;
if (tmpsv) {
if (SvIOK(tmpsv)) {
const I32 i = SvIVX(tmpsv);
return SORT_NORMAL_RETURN_VALUE(i);
}
else {
const NV d = SvNV(tmpsv);
return SORT_NORMAL_RETURN_VALUE(d);
}
}
return S_sv_ncmp(aTHX_ a, b);
}
static I32
S_amagic_i_ncmp(pTHX_ SV *const a, SV *const b)
{
SV * const tmpsv = tryCALL_AMAGICbin(a,b,ncmp_amg);
PERL_ARGS_ASSERT_AMAGIC_I_NCMP;
if (tmpsv) {
if (SvIOK(tmpsv)) {
const I32 i = SvIVX(tmpsv);
return SORT_NORMAL_RETURN_VALUE(i);
}
else {
const NV d = SvNV(tmpsv);
return SORT_NORMAL_RETURN_VALUE(d);
}
}
return S_sv_i_ncmp(aTHX_ a, b);
}
static I32
S_amagic_cmp(pTHX_ SV *const str1, SV *const str2)
{
SV * const tmpsv = tryCALL_AMAGICbin(str1,str2,scmp_amg);
PERL_ARGS_ASSERT_AMAGIC_CMP;
if (tmpsv) {
if (SvIOK(tmpsv)) {
const I32 i = SvIVX(tmpsv);
return SORT_NORMAL_RETURN_VALUE(i);
}
else {
const NV d = SvNV(tmpsv);
return SORT_NORMAL_RETURN_VALUE(d);
}
}
return sv_cmp(str1, str2);
}
#ifdef USE_LOCALE_COLLATE
static I32
S_amagic_cmp_locale(pTHX_ SV *const str1, SV *const str2)
{
SV * const tmpsv = tryCALL_AMAGICbin(str1,str2,scmp_amg);
PERL_ARGS_ASSERT_AMAGIC_CMP_LOCALE;
if (tmpsv) {
if (SvIOK(tmpsv)) {
const I32 i = SvIVX(tmpsv);
return SORT_NORMAL_RETURN_VALUE(i);
}
else {
const NV d = SvNV(tmpsv);
return SORT_NORMAL_RETURN_VALUE(d);
}
}
return sv_cmp_locale(str1, str2);
}
#endif
/*
* ex: set ts=8 sts=4 sw=4 et:
*/
|