crt0/musl/qsort.c
2024-03-02 16:56:50 -08:00

274 lines
6.4 KiB
C

/* Copyright (C) 2011 by Valentin Ochs
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
/* Minor changes by Rich Felker for integration in musl, 2011-04-27. */
/* Smoothsort, an adaptive variant of Heapsort. Memory usage: O(1).
Run time: Worst case O(n log n), close to O(n) in the mostly-sorted case. */
#define _BSD_SOURCE
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#ifndef a_ctz_32
#define a_ctz_32 a_ctz_32
static inline int a_ctz_32(uint32_t x)
{
#ifdef a_clz_32
return 31-a_clz_32(x&-x);
#else
static const char debruijn32[32] = {
0, 1, 23, 2, 29, 24, 19, 3, 30, 27, 25, 11, 20, 8, 4, 13,
31, 22, 28, 18, 26, 10, 7, 12, 21, 17, 9, 6, 16, 5, 15, 14
};
return debruijn32[(x&-x)*0x076be629 >> 27];
#endif
}
#endif
#ifndef a_ctz_64
#define a_ctz_64 a_ctz_64
static inline int a_ctz_64(uint64_t x)
{
static const char debruijn64[64] = {
0, 1, 2, 53, 3, 7, 54, 27, 4, 38, 41, 8, 34, 55, 48, 28,
62, 5, 39, 46, 44, 42, 22, 9, 24, 35, 59, 56, 49, 18, 29, 11,
63, 52, 6, 26, 37, 40, 33, 47, 61, 45, 43, 21, 23, 58, 17, 10,
51, 25, 36, 32, 60, 20, 57, 16, 50, 31, 19, 15, 30, 14, 13, 12
};
if (sizeof(long) < 8) {
uint32_t y = x;
if (!y) {
y = x>>32;
return 32 + a_ctz_32(y);
}
return a_ctz_32(y);
}
return debruijn64[(x&-x)*0x022fdd63cc95386dull >> 58];
}
#endif
static inline int a_ctz_l(unsigned long x)
{
return (sizeof(long) < 8) ? a_ctz_32(x) : a_ctz_64(x);
}
#define ntz(x) a_ctz_l((x))
typedef int (*cmpfun)(const void *, const void *, void *);
static inline int pntz(size_t p[2]) {
int r = ntz(p[0] - 1);
if(r != 0 || (r = 8*sizeof(size_t) + ntz(p[1])) != 8*sizeof(size_t)) {
return r;
}
return 0;
}
static void cycle(size_t width, unsigned char* ar[], int n)
{
unsigned char tmp[256];
size_t l;
int i;
if(n < 2) {
return;
}
ar[n] = tmp;
while(width) {
l = sizeof(tmp) < width ? sizeof(tmp) : width;
memcpy(ar[n], ar[0], l);
for(i = 0; i < n; i++) {
memcpy(ar[i], ar[i + 1], l);
ar[i] += l;
}
width -= l;
}
}
/* shl() and shr() need n > 0 */
static inline void shl(size_t p[2], int n)
{
if(n >= 8 * sizeof(size_t)) {
n -= 8 * sizeof(size_t);
p[1] = p[0];
p[0] = 0;
}
p[1] <<= n;
p[1] |= p[0] >> (sizeof(size_t) * 8 - n);
p[0] <<= n;
}
static inline void shr(size_t p[2], int n)
{
if(n >= 8 * sizeof(size_t)) {
n -= 8 * sizeof(size_t);
p[0] = p[1];
p[1] = 0;
}
p[0] >>= n;
p[0] |= p[1] << (sizeof(size_t) * 8 - n);
p[1] >>= n;
}
static void sift(unsigned char *head, size_t width, cmpfun cmp, void *arg, int pshift, size_t lp[])
{
unsigned char *rt, *lf;
unsigned char *ar[14 * sizeof(size_t) + 1];
int i = 1;
ar[0] = head;
while(pshift > 1) {
rt = head - width;
lf = head - width - lp[pshift - 2];
if(cmp(ar[0], lf, arg) >= 0 && cmp(ar[0], rt, arg) >= 0) {
break;
}
if(cmp(lf, rt, arg) >= 0) {
ar[i++] = lf;
head = lf;
pshift -= 1;
} else {
ar[i++] = rt;
head = rt;
pshift -= 2;
}
}
cycle(width, ar, i);
}
static void trinkle(unsigned char *head, size_t width, cmpfun cmp, void *arg, size_t pp[2], int pshift, int trusty, size_t lp[])
{
unsigned char *stepson,
*rt, *lf;
size_t p[2];
unsigned char *ar[14 * sizeof(size_t) + 1];
int i = 1;
int trail;
p[0] = pp[0];
p[1] = pp[1];
ar[0] = head;
while(p[0] != 1 || p[1] != 0) {
stepson = head - lp[pshift];
if(cmp(stepson, ar[0], arg) <= 0) {
break;
}
if(!trusty && pshift > 1) {
rt = head - width;
lf = head - width - lp[pshift - 2];
if(cmp(rt, stepson, arg) >= 0 || cmp(lf, stepson, arg) >= 0) {
break;
}
}
ar[i++] = stepson;
head = stepson;
trail = pntz(p);
shr(p, trail);
pshift += trail;
trusty = 0;
}
if(!trusty) {
cycle(width, ar, i);
sift(head, width, cmp, arg, pshift, lp);
}
}
void qsort_r(void *base, size_t nel, size_t width, cmpfun cmp, void *arg)
{
size_t lp[12*sizeof(size_t)];
size_t i, size = width * nel;
unsigned char *head, *high;
size_t p[2] = {1, 0};
int pshift = 1;
int trail;
if (!size) return;
head = base;
high = head + size - width;
/* Precompute Leonardo numbers, scaled by element width */
for(lp[0]=lp[1]=width, i=2; (lp[i]=lp[i-2]+lp[i-1]+width) < size; i++);
while(head < high) {
if((p[0] & 3) == 3) {
sift(head, width, cmp, arg, pshift, lp);
shr(p, 2);
pshift += 2;
} else {
if(lp[pshift - 1] >= high - head) {
trinkle(head, width, cmp, arg, p, pshift, 0, lp);
} else {
sift(head, width, cmp, arg, pshift, lp);
}
if(pshift == 1) {
shl(p, 1);
pshift = 0;
} else {
shl(p, pshift - 1);
pshift = 1;
}
}
p[0] |= 1;
head += width;
}
trinkle(head, width, cmp, arg, p, pshift, 0, lp);
while(pshift != 1 || p[0] != 1 || p[1] != 0) {
if(pshift <= 1) {
trail = pntz(p);
shr(p, trail);
pshift += trail;
} else {
shl(p, 2);
pshift -= 2;
p[0] ^= 7;
shr(p, 1);
trinkle(head - lp[pshift] - width, width, cmp, arg, p, pshift + 1, 1, lp);
shl(p, 1);
p[0] |= 1;
trinkle(head - width, width, cmp, arg, p, pshift, 1, lp);
}
head -= width;
}
}
typedef int (*q_cmpfun)(const void *, const void *);
static int wrapper_cmp(const void *v1, const void *v2, void *cmp)
{
return ((q_cmpfun)cmp)(v1, v2);
}
void qsort(void *base, size_t nel, size_t width, q_cmpfun cmp)
{
qsort_r(base, nel, width, wrapper_cmp, (void *)cmp);
}