FFmpeg/libavcodec/mathops.c

#include "mathops.h"

#ifdef TEST

#include <stdlib.h>

int main(void)
{
    unsigned u;

    for(u=0; u<65536; u++) {
        unsigned s = u*u;
        unsigned root = ff_sqrt(s);
        unsigned root_m1 = ff_sqrt(s-1);
        if (s && root != u) {
            fprintf(stderr, "ff_sqrt failed at %u with %u\n", s, root);
            return 1;
        }
        if (u && root_m1 != u - 1) {
            fprintf(stderr, "ff_sqrt failed at %u with %u\n", s, root);
            return 1;
        }
    }
    return 0;
}
#endif /* TEST */