Re: [myhdl-list] Wrap-around support in MyHDL

[Christopher F. <chr...@gm...>]

On 5/20/2011 10:25 AM, Jan Decaluwe wrote:
> As you like the proposal after putting the feature
> back on the map, and I hear no objections, I'd like
> to make some progress.
>
> This is definitely a 0.8 feature, so I will open
> a 0.8-dev branch for development. I will also turn
> the proposal into a MEP.
>

If you like, when the 0.8-dev branch is created, I can take the existing 
tests that we created and move them over, as a starting point, for the 
modbv tests.  Note: Ben did majority of the work for the previous tests :)

Guess it would look something like the following (as a start).  Should 
add additional tests for the expanded features and some tests for 
conversion.

+++ b/myhdl/test/core/test_modbv.py

class TestModbvWrap(TestCase):

     def testWrap(self):
         x = modbv(0, min=-8, max=8)
         x[:] = x + 1
         self.assertEqual(1, x)
         x[:] = x + 2
         self.assertEqual(3, x)
         x[:] = x + 5
         self.assertEqual(-8, x)
         x[:] = x + 1
         self.assertEqual(-7, x)
         x[:] = x - 5
         self.assertEqual(4, x)
         x[:] = x - 4
         self.assertEqual(0, x)
         x[:] += 15
         x[:] = x - 1
         self.assertEqual(-2, x)

     def testInit(self):
         self.assertRaises(ValueError, intbv, 15, min=-8, max=8)
         x = modbv(15, min=-8, max=8)
         self.assertEqual(-1, x)

         self.assertRaises(ValueError, intbv, 5, min=-3, max=8)
         modbv(5, min=-3, max=8)
	self.assertEqual(5, x)


     def testNoWrap(self):
         # verifies the base class does not wrap
         x = intbv(0, min=-8, max=8)
         try:
             x[:] += 15
             self.fail()
         except ValueError:
             pass


if __name__ == "__main__":
     unittest.main()

Chris