C 语言函数指针在代码优化中的作用？

#include <stdio.h>
#include <stdlib.h>

typedef int (*compare_func)(const void*, const void*);

int compare_ints(const void* a, const void* b) {
    return *(int*)a - *(int*)b;
}

void quick_sort(void* array, size_t size, size_t element_size, compare_func compare) {
    if (size <= 1) {
        return;
    }

    void* pivot = array + (rand() % size) * element_size;
    void* i = array;
    void* j = array + (size - 1) * element_size;

    while (i <= j) {
        while (compare(i, pivot) < 0) {
            i += element_size;
        }
        while (compare(j, pivot) > 0) {
            j -= element_size;
        }

        if (i <= j) {
            void* tmp = i;
            i = j;
            j = tmp;
            i += element_size;
            j -= element_size;
        }
    }

    quick_sort(array, i - array, element_size, compare);
    quick_sort(j + element_size, size - (j - array) / element_size, element_size, compare);
}

int main() {
    int arr[] = {1, 5, 3, 8, 2};
    size_t arr_size = sizeof(arr) / sizeof(int);

    quick_sort(arr, arr_size, sizeof(int), compare_ints);

    for (size_t i = 0; i < arr_size; i++) {
        printf("%d ", arr[i]);
    }

    return 0;
}