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Expression coverage understanding

Prachi1
Hi, I am running and analysing expression coverage. There I see that there are some expression with '!' or '~' (logical or bit negate), I do not understand how iccr evaluates it. e.g. diffxy = (~(x-y)) + 1'b1; index hit ---------------------------- 2 0 0 Here value of expression 1 is '0', is it value of x-y or (~(x-y). x is 16 bit vector. I tried all the possible values of x and y but I am not able to hit this condition. can some highlight the issue? Regards, Prachi
Parents

  •  Thanks TAM1,

    This was really very helpful to me. In my code, x was set equal to y, but before the assignment for diffxy I had the condition if(x<y). so I was not able to hit this term.

    One more query I have. For the following expression

    temp2 = ~(temp1 - 1'b1);

      I am getting the expression coverage for uncovered item as:

         ~(temp1 - 1'b1)
         <-------1---------->

                  hit | <1>
               ! -----------
                    0 |  0

    What values should I generate of temp1 which will allow me to hit the expression such that entire assignment value is 0.


     Thanks

    Prachi

     

     

Reply

  •  Thanks TAM1,

    This was really very helpful to me. In my code, x was set equal to y, but before the assignment for diffxy I had the condition if(x<y). so I was not able to hit this term.

    One more query I have. For the following expression

    temp2 = ~(temp1 - 1'b1);

      I am getting the expression coverage for uncovered item as:

         ~(temp1 - 1'b1)
         <-------1---------->

                  hit | <1>
               ! -----------
                    0 |  0

    What values should I generate of temp1 which will allow me to hit the expression such that entire assignment value is 0.


     Thanks

    Prachi

     

     

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