Function assign_minimal_stalls_opt 

pub fn assign_minimal_stalls_opt(
    cubin_path: &Path,
    floor_ptxas: bool,
) -> Option<Vec<u8>>

As above, but floor_ptxas selects whether to floor our computed stall at ptxas’s (sound) or trust our CALIBRATED model outright (false — the true test of whether the measured latencies are complete).