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-rw-r--r--tccqsort.c261
1 files changed, 0 insertions, 261 deletions
diff --git a/tccqsort.c b/tccqsort.c
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--- a/tccqsort.c
+++ /dev/null
@@ -1,261 +0,0 @@
-/* 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. */
-
-#include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-
-//#include "atomic.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 (*tcc_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, tcc_cmpfun cmp, int pshift, size_t lp[], void* ctx)
-{
- 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, ctx) >= 0 && (*cmp)(ar[0], rt, ctx) >= 0) {
- break;
- }
- if((*cmp)(lf, rt, ctx) >= 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, tcc_cmpfun cmp, size_t pp[2], int pshift, int trusty, size_t lp[], void* ctx)
-{
- 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], ctx) <= 0) {
- break;
- }
- if(!trusty && pshift > 1) {
- rt = head - width;
- lf = head - width - lp[pshift - 2];
- if((*cmp)(rt, stepson, ctx) >= 0 || (*cmp)(lf, stepson, ctx) >= 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, pshift, lp, ctx);
- }
-}
-
-LIBTCCAPI void tcc_qsort_s(void *base, size_t nel, size_t width, tcc_cmpfun cmp, void *ctx)
-{
- 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, pshift, lp, ctx);
- shr(p, 2);
- pshift += 2;
- } else {
- if(lp[pshift - 1] >= high - head) {
- trinkle(head, width, cmp, p, pshift, 0, lp, ctx);
- } else {
- sift(head, width, cmp, pshift, lp, ctx);
- }
-
- if(pshift == 1) {
- shl(p, 1);
- pshift = 0;
- } else {
- shl(p, pshift - 1);
- pshift = 1;
- }
- }
-
- p[0] |= 1;
- head += width;
- }
-
- trinkle(head, width, cmp, p, pshift, 0, lp, ctx);
-
- 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, p, pshift + 1, 1, lp, ctx);
- shl(p, 1);
- p[0] |= 1;
- trinkle(head - width, width, cmp, p, pshift, 1, lp, ctx);
- }
- head -= width;
- }
-}