Archipelago » qemu

/* bit operations */

target_ulong helper_bsf(target_ulong t0)

{

    int count;

    target_ulong res;

    res = t0;

    count = 0;

    while ((res & 1) == 0) {

        count++;

        res >>= 1;

    }

    return count;

}

target_ulong helper_bsr(target_ulong t0)

{

    int count;

    target_ulong res, mask;

    res = t0;

    count = TARGET_LONG_BITS - 1;

    mask = (target_ulong)1 << (TARGET_LONG_BITS - 1);

    while ((res & mask) == 0) {

        count--;

        res <<= 1;

    }

    return count;

}