mirror of
https://github.com/php/php-src.git
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386 lines
11 KiB
C
386 lines
11 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend Engine |
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+----------------------------------------------------------------------+
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| Copyright (c) 1998-2018 Zend Technologies Ltd. (http://www.zend.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.00 of the Zend license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.zend.com/license/2_00.txt. |
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| If you did not receive a copy of the Zend license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@zend.com so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Xinchen Hui <laruence@php.net> |
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| Sterling Hughes <sterling@php.net> |
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+----------------------------------------------------------------------+
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*/
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/* $Id$ */
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#include "zend.h"
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#include "zend_sort.h"
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#include <limits.h>
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#define QSORT_STACK_SIZE (sizeof(size_t) * CHAR_BIT)
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ZEND_API void zend_qsort(void *base, size_t nmemb, size_t siz, compare_func_t compare, swap_func_t swp) /* {{{ */
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{
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void *begin_stack[QSORT_STACK_SIZE];
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void *end_stack[QSORT_STACK_SIZE];
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register char *begin;
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register char *end;
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register char *seg1;
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register char *seg2;
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register char *seg2p;
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register int loop;
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size_t offset;
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begin_stack[0] = (char *) base;
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end_stack[0] = (char *) base + ((nmemb - 1) * siz);
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for (loop = 0; loop >= 0; --loop) {
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begin = begin_stack[loop];
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end = end_stack[loop];
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while (begin < end) {
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offset = (end - begin) >> Z_L(1);
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swp(begin, begin + (offset - (offset % siz)));
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seg1 = begin + siz;
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seg2 = end;
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while (1) {
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for (; seg1 < seg2 && compare(begin, seg1) > 0;
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seg1 += siz);
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for (; seg2 >= seg1 && compare(seg2, begin) > 0;
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seg2 -= siz);
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if (seg1 >= seg2)
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break;
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swp(seg1, seg2);
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seg1 += siz;
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seg2 -= siz;
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}
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swp(begin, seg2);
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seg2p = seg2;
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if ((seg2p - begin) <= (end - seg2p)) {
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if ((seg2p + siz) < end) {
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begin_stack[loop] = seg2p + siz;
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end_stack[loop++] = end;
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}
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end = seg2p - siz;
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}
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else {
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if ((seg2p - siz) > begin) {
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begin_stack[loop] = begin;
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end_stack[loop++] = seg2p - siz;
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}
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begin = seg2p + siz;
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}
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}
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}
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}
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/* }}} */
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static inline void zend_sort_2(void *a, void *b, compare_func_t cmp, swap_func_t swp) /* {{{ */ {
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if (cmp(a, b) > 0) {
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swp(a, b);
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}
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}
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/* }}} */
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static inline void zend_sort_3(void *a, void *b, void *c, compare_func_t cmp, swap_func_t swp) /* {{{ */ {
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if (!(cmp(a, b) > 0)) {
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if (!(cmp(b, c) > 0)) {
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return;
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}
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swp(b, c);
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if (cmp(a, b) > 0) {
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swp(a, b);
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}
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return;
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}
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if (!(cmp(c, b) > 0)) {
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swp(a, c);
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return;
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}
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swp(a, b);
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if (cmp(b, c) > 0) {
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swp(b, c);
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}
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}
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/* }}} */
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static void zend_sort_4(void *a, void *b, void *c, void *d, compare_func_t cmp, swap_func_t swp) /* {{{ */ {
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zend_sort_3(a, b, c, cmp, swp);
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if (cmp(c, d) > 0) {
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swp(c, d);
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if (cmp(b, c) > 0) {
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swp(b, c);
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if (cmp(a, b) > 0) {
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swp(a, b);
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}
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}
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}
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}
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/* }}} */
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static void zend_sort_5(void *a, void *b, void *c, void *d, void *e, compare_func_t cmp, swap_func_t swp) /* {{{ */ {
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zend_sort_4(a, b, c, d, cmp, swp);
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if (cmp(d, e) > 0) {
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swp(d, e);
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if (cmp(c, d) > 0) {
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swp(c, d);
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if (cmp(b, c) > 0) {
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swp(b, c);
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if (cmp(a, b) > 0) {
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swp(a, b);
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}
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}
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}
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}
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}
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/* }}} */
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ZEND_API void zend_insert_sort(void *base, size_t nmemb, size_t siz, compare_func_t cmp, swap_func_t swp) /* {{{ */{
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switch (nmemb) {
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case 0:
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case 1:
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break;
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case 2:
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zend_sort_2(base, (char *)base + siz, cmp, swp);
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break;
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case 3:
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zend_sort_3(base, (char *)base + siz, (char *)base + siz + siz, cmp, swp);
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break;
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case 4:
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{
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size_t siz2 = siz + siz;
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zend_sort_4(base, (char *)base + siz, (char *)base + siz2, (char *)base + siz + siz2, cmp, swp);
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}
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break;
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case 5:
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{
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size_t siz2 = siz + siz;
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zend_sort_5(base, (char *)base + siz, (char *)base + siz2, (char *)base + siz + siz2, (char *)base + siz2 + siz2, cmp, swp);
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}
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break;
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default:
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{
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char *i, *j, *k;
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char *start = (char *)base;
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char *end = start + (nmemb * siz);
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size_t siz2= siz + siz;
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char *sentry = start + (6 * siz);
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for (i = start + siz; i < sentry; i += siz) {
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j = i - siz;
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if (!(cmp(j, i) > 0)) {
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continue;
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}
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while (j != start) {
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j -= siz;
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if (!(cmp(j, i) > 0)) {
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j += siz;
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break;
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}
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}
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for (k = i; k > j; k -= siz) {
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swp(k, k - siz);
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}
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}
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for (i = sentry; i < end; i += siz) {
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j = i - siz;
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if (!(cmp(j, i) > 0)) {
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continue;
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}
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do {
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j -= siz2;
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if (!(cmp(j, i) > 0)) {
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j += siz;
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if (!(cmp(j, i) > 0)) {
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j += siz;
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}
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break;
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}
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if (j == start) {
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break;
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}
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if (j == start + siz) {
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j -= siz;
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if (cmp(i, j) > 0) {
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j += siz;
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}
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break;
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}
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} while (1);
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for (k = i; k > j; k -= siz) {
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swp(k, k - siz);
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}
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}
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}
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break;
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}
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}
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/* }}} */
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/* {{{ ZEND_API void zend_sort(void *base, size_t nmemb, size_t siz, compare_func_t cmp, swap_func_t swp)
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*
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* Derived from LLVM's libc++ implementation of std::sort.
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*
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* ===========================================================================
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* libc++ License
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* ===========================================================================
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*
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* The libc++ library is dual licensed under both the University of Illinois
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* "BSD-Like" license and the MIT license. As a user of this code you may
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* choose to use it under either license. As a contributor, you agree to allow
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* your code to be used under both.
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*
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* Full text of the relevant licenses is included below.
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*
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* ===========================================================================
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*
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* University of Illinois/NCSA
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* Open Source License
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*
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* Copyright (c) 2009-2012 by the contributors listed at
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* http://llvm.org/svn/llvm-project/libcxx/trunk/CREDITS.TXT
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*
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* All rights reserved.
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*
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* Developed by:
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*
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* LLVM Team
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*
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* University of Illinois at Urbana-Champaign
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*
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* http://llvm.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal with the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimers.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimers in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the names of the LLVM Team, University of Illinois at
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* Urbana-Champaign, nor the names of its contributors may be used to
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* endorse or promote products derived from this Software without
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* specific prior written permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* WITH THE SOFTWARE.
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*
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* ===========================================================================
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*
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* Copyright (c) 2009-2012 by the contributors listed at
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* http://llvm.org/svn/llvm-project/libcxx/trunk/CREDITS.TXT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
|
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* sell copies of the Software, and to permit persons to whom the Software is
|
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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ZEND_API void zend_sort(void *base, size_t nmemb, size_t siz, compare_func_t cmp, swap_func_t swp)
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{
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while (1) {
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if (nmemb <= 16) {
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zend_insert_sort(base, nmemb, siz, cmp, swp);
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return;
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} else {
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char *i, *j;
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char *start = (char *)base;
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char *end = start + (nmemb * siz);
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size_t offset = (nmemb >> Z_L(1));
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char *pivot = start + (offset * siz);
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if ((nmemb >> Z_L(10))) {
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size_t delta = (offset >> Z_L(1)) * siz;
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zend_sort_5(start, start + delta, pivot, pivot + delta, end - siz, cmp, swp);
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} else {
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zend_sort_3(start, pivot, end - siz, cmp, swp);
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}
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swp(start + siz, pivot);
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pivot = start + siz;
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i = pivot + siz;
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j = end - siz;
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while (1) {
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while (cmp(pivot, i) > 0) {
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i += siz;
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if (UNEXPECTED(i == j)) {
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goto done;
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}
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}
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j -= siz;
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if (UNEXPECTED(j == i)) {
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goto done;
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}
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while (cmp(j, pivot) > 0) {
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j -= siz;
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if (UNEXPECTED(j == i)) {
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goto done;
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}
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}
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swp(i, j);
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i += siz;
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if (UNEXPECTED(i == j)) {
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goto done;
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}
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}
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done:
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swp(pivot, i - siz);
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if ((i - siz) - start < end - i) {
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zend_sort(start, (i - start)/siz - 1, siz, cmp, swp);
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base = i;
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nmemb = (end - i)/siz;
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} else {
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zend_sort(i, (end - i)/siz, siz, cmp, swp);
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nmemb = (i - start)/siz - 1;
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}
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}
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}
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}
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/* }}} */
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/*
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* Local Variables:
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* c-basic-offset: 4
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* tab-width: 4
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* End:
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* vim600: sw=4 ts=4 fdm=marker
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* vim<600: sw=4 ts=4
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*/
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