direct code search vs linear search

#include <assert.h>

#include <dlfcn.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

#include <sys/time.h>


#define SETSIZE 10
#define NRUNS   10000000

typedef int (*func)(uint32_t);

static func
getfunc(uint32_t *set)
{
    size_t i;
    FILE *f;
    char path[PATH_MAX];
    char *pres;
    void *dlhandle;
    func r;
    char *error;

    f = fopen("dcode.c", "w");
    assert(f != NULL);
    fprintf(f, "#include <stdint.h>\n\n");
    fprintf(f, "int set_test(uint32_t key) {\n");
    for (i=0; i<SETSIZE; i++) {
        fprintf(f, " if (key == %d) return 1;\n", set[i]);
    }
    fprintf(f, " return 0;\n}\n");
    fclose(f);

    system("cc -s -O3 -c dcode.c");
    system("cc -shared  -Wl,-soname,libdcst.so -o libdcst.so dcode.o");

    pres = realpath("libdcst.so", path);
    assert(pres != NULL);

    dlhandle = dlopen(path, RTLD_NOW);
    assert(dlhandle != NULL);

    *(void **) &r = dlsym(dlhandle, "set_test");
    if ((error = dlerror()) != NULL)  {
        fprintf(stderr, "%s\n", error);
        exit(EXIT_FAILURE);
    }

/*  dlclose(dlhandle);*/
    return r;
}


int
main()
{
    uint32_t set[SETSIZE];
    size_t i;
    func f;
    struct timeval begin, end;
    int acc;

    for (i=0; i<SETSIZE; i++) {
        set[i] = rand();
    }

    f = getfunc(set);

    gettimeofday(&begin, NULL);
    acc = 0;
    for (i=0; i<NRUNS; i++) {
        uint32_t sample;

        sample = rand();
        if (f(sample)) acc++;
    }
    gettimeofday(&end, NULL);
    printf("direct code: %f secs\n", ((double)((end.tv_sec - begin.tv_sec)*1000000 + end.tv_usec - begin.tv_usec)) / 1000000.0);

    acc = 0;
    gettimeofday(&begin, NULL);
    for (i=0; i<NRUNS; i++) {
        uint32_t sample;
        int j;

        sample = rand();
        for (j=0; j<SETSIZE; j++) {
            if (set[j] == sample) acc++;
        }
    }
    gettimeofday(&end, NULL);
    printf("linear search: %f secs, acc=%d\n", ((double)((end.tv_sec - begin.tv_sec)*1000000 + end.tv_usec - begin.tv_usec)) / 1000000.0, acc);

    return EXIT_SUCCESS;
}