litex/migen/test/test_signed.py

43 lines
1.4 KiB
Python

import unittest
from migen import *
from migen.test.support import SimCase
class SignedCase(SimCase, unittest.TestCase):
class TestBench(Module):
def __init__(self):
self.a = Signal((3, True))
self.b = Signal((4, True))
comps = [
lambda p, q: p > q,
lambda p, q: p >= q,
lambda p, q: p < q,
lambda p, q: p <= q,
lambda p, q: p == q,
lambda p, q: p != q,
]
self.vals = []
for asign in 1, -1:
for bsign in 1, -1:
for f in comps:
r = Signal()
r0 = f(asign*self.a, bsign*self.b)
self.comb += r.eq(r0)
self.vals.append((asign, bsign, f, r, r0.op))
def test_comparisons(self):
def gen():
for i in range(-4, 4):
yield self.tb.a.eq(i)
yield self.tb.b.eq(i)
a = yield self.tb.a
b = yield self.tb.b
for asign, bsign, f, r, op in self.tb.vals:
r, r0 = (yield r), f(asign*a, bsign*b)
self.assertEqual(r, int(r0),
"got {}, want {}*{} {} {}*{} = {}".format(
r, asign, a, op, bsign, b, r0))
yield
self.run_with(gen())