nmigen/test/test_sim.py

   1 from .tools import *
   2 from ..hdl.ast import *
   3 from ..hdl.ir import *
   4 from ..back.pysim import *
   5
   6
   7 class SimulatorUnitTestCase(FHDLTestCase):
   8     def assertOperator(self, stmt, inputs, output):
   9         inputs = [Value.wrap(i) for i in inputs]
  10         output = Value.wrap(output)
  11
  12         isigs = [Signal(i.shape(), name=n) for i, n in zip(inputs, "abcd")]
  13         osig  = Signal(output.shape(), name="y")
  14
  15         frag = Fragment()
  16         frag.add_statements(osig.eq(stmt(*isigs)))
  17         frag.add_driver(osig)
  18
  19         with Simulator(frag,
  20                 vcd_file =open("test.vcd",  "w"),
  21                 gtkw_file=open("test.gtkw", "w"),
  22                 traces=[*isigs, osig]) as sim:
  23             def process():
  24                 for isig, input in zip(isigs, inputs):
  25                     yield isig.eq(input)
  26                 yield Delay()
  27                 self.assertEqual((yield osig), output.value)
  28             sim.add_process(process)
  29             sim.run()
  30
  31     def test_invert(self):
  32         stmt = lambda a: ~a
  33         self.assertOperator(stmt, [C(0b0000, 4)], C(0b1111, 4))
  34         self.assertOperator(stmt, [C(0b1010, 4)], C(0b0101, 4))
  35         self.assertOperator(stmt, [C(0,      4)], C(-1,     4))
  36
  37     def test_neg(self):
  38         stmt = lambda a: -a
  39         self.assertOperator(stmt, [C(0b0000, 4)], C(0b0000, 4))
  40         self.assertOperator(stmt, [C(0b0001, 4)], C(0b1111, 4))
  41         self.assertOperator(stmt, [C(0b1010, 4)], C(0b0110, 4))
  42         self.assertOperator(stmt, [C(1,      4)], C(-1,     4))
  43         self.assertOperator(stmt, [C(5,      4)], C(-5,     4))
  44
  45     def test_bool(self):
  46         stmt = lambda a: a.bool()
  47         self.assertOperator(stmt, [C(0, 4)], C(0))
  48         self.assertOperator(stmt, [C(1, 4)], C(1))
  49         self.assertOperator(stmt, [C(2, 4)], C(1))
  50
  51     def test_add(self):
  52         stmt = lambda a, b: a + b
  53         self.assertOperator(stmt, [C(0,  4), C(1,  4)], C(1,   4))
  54         self.assertOperator(stmt, [C(-5, 4), C(-5, 4)], C(-10, 5))
  55
  56     def test_sub(self):
  57         stmt = lambda a, b: a - b
  58         self.assertOperator(stmt, [C(2,  4), C(1,  4)], C(1,   4))
  59         self.assertOperator(stmt, [C(0,  4), C(1,  4)], C(-1,  4))
  60         self.assertOperator(stmt, [C(0,  4), C(10, 4)], C(-10, 5))
  61
  62     def test_and(self):
  63         stmt = lambda a, b: a & b
  64         self.assertOperator(stmt, [C(0b1100, 4), C(0b1010, 4)], C(0b1000, 4))
  65
  66     def test_or(self):
  67         stmt = lambda a, b: a | b
  68         self.assertOperator(stmt, [C(0b1100, 4), C(0b1010, 4)], C(0b1110, 4))
  69
  70     def test_xor(self):
  71         stmt = lambda a, b: a ^ b
  72         self.assertOperator(stmt, [C(0b1100, 4), C(0b1010, 4)], C(0b0110, 4))
  73
  74     def test_shl(self):
  75         stmt = lambda a, b: a << b
  76         self.assertOperator(stmt, [C(0b1001, 4), C(0)],  C(0b1001,    5))
  77         self.assertOperator(stmt, [C(0b1001, 4), C(3)],  C(0b1001000, 7))
  78         self.assertOperator(stmt, [C(0b1001, 4), C(-2)], C(0b10,      7))
  79
  80     def test_shr(self):
  81         stmt = lambda a, b: a >> b
  82         self.assertOperator(stmt, [C(0b1001, 4), C(0)],  C(0b1001,    4))
  83         self.assertOperator(stmt, [C(0b1001, 4), C(2)],  C(0b10,      4))
  84         self.assertOperator(stmt, [C(0b1001, 4), C(-2)], C(0b100100,  5))
  85
  86     def test_eq(self):
  87         stmt = lambda a, b: a == b
  88         self.assertOperator(stmt, [C(0, 4), C(0, 4)], C(1))
  89         self.assertOperator(stmt, [C(0, 4), C(1, 4)], C(0))
  90         self.assertOperator(stmt, [C(1, 4), C(0, 4)], C(0))
  91
  92     def test_ne(self):
  93         stmt = lambda a, b: a != b
  94         self.assertOperator(stmt, [C(0, 4), C(0, 4)], C(0))
  95         self.assertOperator(stmt, [C(0, 4), C(1, 4)], C(1))
  96         self.assertOperator(stmt, [C(1, 4), C(0, 4)], C(1))
  97
  98     def test_lt(self):
  99         stmt = lambda a, b: a < b
 100         self.assertOperator(stmt, [C(0, 4), C(0, 4)], C(0))
 101         self.assertOperator(stmt, [C(0, 4), C(1, 4)], C(1))
 102         self.assertOperator(stmt, [C(1, 4), C(0, 4)], C(0))
 103
 104     def test_ge(self):
 105         stmt = lambda a, b: a >= b
 106         self.assertOperator(stmt, [C(0, 4), C(0, 4)], C(1))
 107         self.assertOperator(stmt, [C(0, 4), C(1, 4)], C(0))
 108         self.assertOperator(stmt, [C(1, 4), C(0, 4)], C(1))
 109
 110     def test_gt(self):
 111         stmt = lambda a, b: a > b
 112         self.assertOperator(stmt, [C(0, 4), C(0, 4)], C(0))
 113         self.assertOperator(stmt, [C(0, 4), C(1, 4)], C(0))
 114         self.assertOperator(stmt, [C(1, 4), C(0, 4)], C(1))
 115
 116     def test_le(self):
 117         stmt = lambda a, b: a <= b
 118         self.assertOperator(stmt, [C(0, 4), C(0, 4)], C(1))
 119         self.assertOperator(stmt, [C(0, 4), C(1, 4)], C(1))
 120         self.assertOperator(stmt, [C(1, 4), C(0, 4)], C(0))
 121
 122     def test_mux(self):
 123         stmt = lambda a, b, c: Mux(c, a, b)
 124         self.assertOperator(stmt, [C(2, 4), C(3, 4), C(0)], C(3, 4))
 125         self.assertOperator(stmt, [C(2, 4), C(3, 4), C(1)], C(2, 4))
 126
 127     def test_slice(self):
 128         stmt1 = lambda a: a[2]
 129         self.assertOperator(stmt1, [C(0b10110100, 8)], C(0b1,  1))
 130         stmt2 = lambda a: a[2:4]
 131         self.assertOperator(stmt2, [C(0b10110100, 8)], C(0b01, 2))
 132
 133     def test_cat(self):
 134         self.assertOperator(Cat, [C(0b10, 2), C(0b01, 2)], C(0b0110, 4))
 135
 136     def test_repl(self):
 137         stmt = lambda a: Repl(a, 3)
 138         self.assertOperator(stmt, [C(0b10, 2)], C(0b101010, 6))