To be precise I am here for RAW hazard. Consider a 5 stage pipeline .
In case of $ I_4-I_1$ dependency , I am not sure if it is an $ RAW$ hazard as $ I_4$ does not depends on value of $ R_1$ that $ I_1$ gives. and even if it fetches it ,it still be a wrong value as per the instruction sequence as $ I_2$ is modifying it.
So , is $ I_4-I_1$ a $ RAW$ hazard ?
and if yes, then please give suitable explanation why so and related information about $ RAW$ hazard as it happened even if $ I_2$ modified the Value in between .