I want to access a slice with a dynamic value. I have tried to do it in different ways. In the first case reducing the logic of the module for the control of the index value etc, verilator told me that it is not a constant value and I agree with that and then I change for the second version but I go…

A simple shift works in your case always_comb begin not_cero = ( in2 << ( $bits(in2)-in1) ) != '0; end Note that parenthesis are not needed, but I find it makes it easier to read.