source: doc/theses/thierry_delisle_PhD/code/readyQ_proto/bts_test.cpp@ bb7422a

#include <cassert>
#include <iostream>

bool bts(volatile size_t & target, size_t bit ) {
        bool result = false;
        asm volatile(
                "LOCK btsq %[bit], %[target]\n\t"
                :"=c" (result)
                : [target] "m" (target), [bit] "r" (bit)
        );
        return result;
}

bool btr(volatile size_t & target, size_t bit ) {
        bool result = false;
        asm volatile(
                "LOCK btrq %[bit], %[target]\n\t"
                :"=c" (result)
                : [target] "m" (target), [bit] "r" (bit)
        );
        return result;
}

int main() {
        volatile size_t i = 0;
        std::cout << std::hex << i << std::endl;
        assert(bts(i, 31));
        std::cout << std::hex << i << std::endl;
        assert(btr(i, 31));
        std::cout << std::hex << i << std::endl;
        return 0;
}