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Constraining Dynamic array size

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Hello All, I have a query in constraining the size of dynamic array. One way of constraining i have given bellow. class dynamic_array; rand int array_size; rand logic[7:0] data[]; constraint arry_constrian{ data.size() == array_size; } endclass In the above code there is a great possibilities that dynamic array might get generate first then array_size, in that case data size will be random. We can use solve before construct, but I am not sure how to use solve before construct for dynamic array. It would be good if i get some comments on the above. Sundar


Originally posted in cdnusers.org by sundar_80
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  • I should also clarify that if the size of a dynamic array is not constrained, then the size of that array remains the same across generation. In this case, only members of the array are randomized. So size of an array is considered as a random variable if and only if a constraint is specified for it. Also, if there is a constraint specified for size of an array, I THINK that the array is resized only if the randomly generated size is bigger than the previous size. For example, if a dynamic array size is 100, and I constrain the size to 50, then the actual array size doesn't change, but randomization only randomizes the first 50 elements. But if I constrain the size to be 200, then the array is resized and the first 200 elements are randomized. Sasan


    Originally posted in cdnusers.org by iman2418
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  • I should also clarify that if the size of a dynamic array is not constrained, then the size of that array remains the same across generation. In this case, only members of the array are randomized. So size of an array is considered as a random variable if and only if a constraint is specified for it. Also, if there is a constraint specified for size of an array, I THINK that the array is resized only if the randomly generated size is bigger than the previous size. For example, if a dynamic array size is 100, and I constrain the size to 50, then the actual array size doesn't change, but randomization only randomizes the first 50 elements. But if I constrain the size to be 200, then the array is resized and the first 200 elements are randomized. Sasan


    Originally posted in cdnusers.org by iman2418
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