#include <cstdio>
#include <ctime>

inline bool bittest_gcc(unsigned x, int c)
{
    return x & (1 << c);
}
inline bool bittest_asm(unsigned x, int c)
{
    bool res;
    __asm__ __volatile__(
        "btl %1,%2\n" "setb %0"
        :"=q"(res) :"r"(c), "r"(x) );
    return res;
}

volatile bool res;

int main(void)
{
    for(unsigned n=0; n<32; ++n)
        if(bittest_gcc(0x12345678,n)
        != bittest_asm(0x12345678, n))
            std::fprintf(stderr, "sanity test fails\n");

    {
        clock_t iclock = std::clock();
        unsigned counter = 0;
        while(std::clock() - iclock < 4*CLOCKS_PER_SEC)
        {
            for(unsigned n=0; n<100; ++n)
                res = bittest_gcc(counter, n&31);
            ++counter;
        }
        std::printf("gcc test: %llu loops\n", counter*100ULL);
    }

    {
        clock_t iclock = std::clock();
        unsigned counter = 0;
        while(std::clock() - iclock < 4*CLOCKS_PER_SEC)
        {
            for(unsigned n=0; n<100; ++n)
                res = bittest_asm(counter, n&31);
            ++counter;
        }
        std::printf("asm test: %llu loops\n", counter*100ULL);
    }
}