RESAMP_STEP_BITS
qi = q >> RESAMP_STEP_BITS;
s += (int64_t)qf * ds >> RESAMP_STEP_BITS;
#define RESAMP_STEP (1 << RESAMP_STEP_BITS)
qi = q >> RESAMP_STEP_BITS;
s += (int64_t)qf * ds >> RESAMP_STEP_BITS;
#define RESAMP_STEP (1 << RESAMP_STEP_BITS)