Unable to run code in optimization level O1, O2 and O3 in DS-5

Hi all,

I am able to run code in optimization level - O0 in DS-5 and outputs also matched with reference outputs, but the same code is not working in other optimization levels - O1, O2 and O3 in DS-5, it is simply exiting from program.

typedef short Word16;

typedef struct student

{

       Word16  x;
       Word16  y;

}stu;

void inputs_read( stu *st_fx)

{

          st_fx->x= 0;

          st_fx->y= -1;

}

This code is not working in DS-5.  when i am trying to run, at this point program execution stopped in DS-5.

I tried debugging the code in -O1, -O2 ,I found it is not able to find some structure variables with data type short int , other variables from the same structure with same data types are working fine. I didn't understand the reason.

I added a printf() statement in between these two structure variables , with this code is working fine. But i am not getting whether the issue is related to structure variables or alignment or with other.

void inputs_read( stu *st_fx)

{

          st_fx->x= 0;

          printf("%d\n", st_fx->x);

          st_fx->y= -1;

}

with this printf() statement code is working fine.  

Can anyone please guide me on this. I blocked at this point, please help me on this.

Thanks in advance,

Divya.