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/* MIT License
*
* Copyright (c) 2023 Tyge Løvset
*
* 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.
*/
#include <stc/priv/template.h>
#include <stc/ccommon.h>
/* Generic Quicksort in C, performs as fast as c++ std::sort().
template params:
#define i_val - value type [required]
#define i_less - less function. default: *x < *y
#define i_tag NAME - define csort_NAME(). default {i_val}
// test:
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#define i_val int
#include <stc/algo/csort.h>
#include <stc/crandom.h>
#ifdef __cplusplus
#include <algorithm>
#endif
void testsort(csort_int_value *a, size_t size, const char *desc) {
clock_t t = clock();
csort_int(a, size);
t = clock() - t;
printf("%s: %zu elements sorted in %.3fms\n",
desc, size, t*1000.0/CLOCKS_PER_SEC);
}
int main() {
size_t i, size = 10000000;
csort_int_value *a = (csort_int_value*)malloc(sizeof(*a) * size);
if (a != NULL) {
for (i = 0; i < size; i++)
a[i] = crandom() & (1U << 28) - 1;
testsort(a, size, "random");
for (i = 0; i < 20; i++) printf(" %d", a[i]);
puts("");
free(a);
}
}*/
typedef i_val c_PASTE(c_PASTE(csort_, i_tag), _value);
static inline void c_PASTE(cisort_, i_tag)(i_val arr[], intptr_t lo, intptr_t hi) {
for (intptr_t j = lo, i = lo + 1; i <= hi; j = i, ++i) {
i_val key = arr[i];
while (j >= 0 && (i_less((&key), (&arr[j])))) {
arr[j + 1] = arr[j];
--j;
}
arr[j + 1] = key;
}
}
static inline void c_PASTE(cqsort_, i_tag)(i_val arr[], intptr_t lo, intptr_t hi) {
intptr_t i = lo, j;
while (lo < hi) {
i_val pivot = arr[lo + (hi - lo)*7/16];
j = hi;
while (i <= j) {
while (i_less((&arr[i]), (&pivot))) ++i;
while (i_less((&pivot), (&arr[j]))) --j;
if (i <= j) {
c_SWAP(i_val, arr+i, arr+j);
++i; --j;
}
}
if (j - lo > hi - i) {
c_SWAP(intptr_t, &lo, &i);
c_SWAP(intptr_t, &hi, &j);
}
if (j - lo > 64) c_PASTE(cqsort_, i_tag)(arr, lo, j);
else if (j > lo) c_PASTE(cisort_, i_tag)(arr, lo, j);
lo = i;
}
}
static inline void c_PASTE(csort_, i_tag)(i_val arr[], size_t n)
{ c_PASTE(cqsort_, i_tag)(arr, 0, (intptr_t)n - 1); }
#include <stc/priv/template.h>
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