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3/3: Behavioural RTL

In `behavioural' expression, a thread, as found in imperative languages such as C and Java, assigns to variables, makes reference to variables already updated and can re-assign new values.

Unlike 'pure RTL', the order of the statements has an effect.

The following behavioural code

        if (k) foo = y;
        bar = !foo;

can be compiled down to the following, unordered `pure RTL':

        foo <= (k) ? y: foo;
        bar <= !((k) ? y: foo);