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Controlling generation

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Hello, I have a query in generation. Suppose if i need to generate a field based on other field, For example class gen; rand rw_wr; rand data; endclass in the above code i want to generate data only when rw_wr = 1 if rw_wr = '0' data should not be generated. For the above scenario how to write the generation constraint. Sundar


Originally posted in cdnusers.org by sundar_80
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  • The answer depends on your reason for asking this question. If your goal is to save generation effort by not randomizing "data", then perhaps the benefit gained by preventing the randomization of "data" is not worth the effort. If your goal is not to loose the value of "data" because of the randomization only when "rw_wr" is set to 0, then you can do this in multiple ways. If you want "rw_wr" to be generated first, then you can randomize "rw_wr" first, and depending on the result randomize the rest of the data object by explicitly using "randomize(data)". If you don't want to to impose an ordering because you feel such ordering may affect your randomization behavior, then you can save the content of "data" in a temporary variable by defining "pre_randomize()" and putting that value back into "data" by extending "post_randomize()". Sasan


    Originally posted in cdnusers.org by iman2418
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  • The answer depends on your reason for asking this question. If your goal is to save generation effort by not randomizing "data", then perhaps the benefit gained by preventing the randomization of "data" is not worth the effort. If your goal is not to loose the value of "data" because of the randomization only when "rw_wr" is set to 0, then you can do this in multiple ways. If you want "rw_wr" to be generated first, then you can randomize "rw_wr" first, and depending on the result randomize the rest of the data object by explicitly using "randomize(data)". If you don't want to to impose an ordering because you feel such ordering may affect your randomization behavior, then you can save the content of "data" in a temporary variable by defining "pre_randomize()" and putting that value back into "data" by extending "post_randomize()". Sasan


    Originally posted in cdnusers.org by iman2418
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