src/add/unit_test_single.py

   1 from random import randint
   2 from random import seed
   3
   4 import sys
   5 from sfpy import Float32
   6
   7 def get_mantissa(x):
   8     return 0x7fffff & x
   9
  10 def get_exponent(x):
  11     return ((x & 0x7f800000) >> 23) - 127
  12
  13 def set_exponent(x, e):
  14     return (x & ~0x7f800000) | ((e+127) << 23)
  15
  16 def get_sign(x):
  17     return ((x & 0x80000000) >> 31)
  18
  19 def is_nan(x):
  20     return get_exponent(x) == 128 and get_mantissa(x) != 0
  21
  22 def is_inf(x):
  23     return get_exponent(x) == 128 and get_mantissa(x) == 0
  24
  25 def is_pos_inf(x):
  26     return is_inf(x) and not get_sign(x)
  27
  28 def is_neg_inf(x):
  29     return is_inf(x) and get_sign(x)
  30
  31 def match(x, y):
  32     return (
  33         (is_pos_inf(x) and is_pos_inf(y)) or
  34         (is_neg_inf(x) and is_neg_inf(y)) or
  35         (is_nan(x) and is_nan(y)) or
  36         (x == y)
  37         )
  38
  39 def get_case(dut, a, b):
  40     yield dut.in_a.v.eq(a)
  41     yield dut.in_a.stb.eq(1)
  42     yield
  43     yield
  44     a_ack = (yield dut.in_a.ack)
  45     assert a_ack == 0
  46
  47     yield dut.in_a.stb.eq(0)
  48
  49     yield dut.in_b.v.eq(b)
  50     yield dut.in_b.stb.eq(1)
  51     yield
  52     yield
  53     b_ack = (yield dut.in_b.ack)
  54     assert b_ack == 0
  55
  56     yield dut.in_b.stb.eq(0)
  57
  58     yield dut.out_z.ack.eq(1)
  59
  60     while True:
  61         out_z_stb = (yield dut.out_z.stb)
  62         if not out_z_stb:
  63             yield
  64             continue
  65         out_z = yield dut.out_z.v
  66         yield dut.out_z.ack.eq(0)
  67         yield
  68         break
  69
  70     return out_z
  71
  72 def check_case(dut, a, b, z):
  73     out_z = yield from get_case(dut, a, b)
  74     assert out_z == z, "Output z 0x%x not equal to expected 0x%x" % (out_z, z)
  75
  76
  77 def run_test(dut, stimulus_a, stimulus_b, op):
  78
  79     expected_responses = []
  80     actual_responses = []
  81     for a, b in zip(stimulus_a, stimulus_b):
  82         af = Float32.from_bits(a)
  83         bf = Float32.from_bits(b)
  84         z = op(af, bf)
  85         expected_responses.append(z.get_bits())
  86         #print (af, bf, z)
  87         actual = yield from get_case(dut, a, b)
  88         actual_responses.append(actual)
  89
  90     if len(actual_responses) < len(expected_responses):
  91         print ("Fail ... not enough results")
  92         exit(0)
  93
  94     for expected, actual, a, b in zip(expected_responses, actual_responses,
  95                                       stimulus_a, stimulus_b):
  96         passed = match(expected, actual)
  97
  98         if not passed:
  99
 100             print ("Fail ... expected:", hex(expected), "actual:", hex(actual))
 101
 102             print (hex(a))
 103             print ("a mantissa:", a & 0x7fffff)
 104             print ("a exponent:", ((a & 0x7f800000) >> 23) - 127)
 105             print ("a sign:", ((a & 0x80000000) >> 31))
 106
 107             print (hex(b))
 108             print ("b mantissa:", b & 0x7fffff)
 109             print ("b exponent:", ((b & 0x7f800000) >> 23) - 127)
 110             print ("b sign:", ((b & 0x80000000) >> 31))
 111
 112             print (hex(expected))
 113             print ("expected mantissa:", expected & 0x7fffff)
 114             print ("expected exponent:", ((expected & 0x7f800000) >> 23) - 127)
 115             print ("expected sign:", ((expected & 0x80000000) >> 31))
 116
 117             print (hex(actual))
 118             print ("actual mantissa:", actual & 0x7fffff)
 119             print ("actual exponent:", ((actual & 0x7f800000) >> 23) - 127)
 120             print ("actual sign:", ((actual & 0x80000000) >> 31))
 121
 122             sys.exit(0)
 123
 124 corner_cases = [0x80000000, 0x00000000, 0x7f800000, 0xff800000,
 125                 0x7fc00000, 0xffc00000]
 126
 127 def run_corner_cases(dut, count, op):
 128     #corner cases
 129     from itertools import permutations
 130     stimulus_a = [i[0] for i in permutations(corner_cases, 2)]
 131     stimulus_b = [i[1] for i in permutations(corner_cases, 2)]
 132     yield from run_test(dut, stimulus_a, stimulus_b, op)
 133     count += len(stimulus_a)
 134     print (count, "vectors passed")
 135
 136 def run_test_2(dut, stimulus_a, stimulus_b, op):
 137     yield from run_test(dut, stimulus_a, stimulus_b, op)
 138     yield from run_test(dut, stimulus_b, stimulus_a, op)
 139
 140 def run_cases(dut, count, op, fixed_num, num_entries):
 141     if isinstance(fixed_num, int):
 142         stimulus_a = [fixed_num for i in range(num_entries)]
 143         report = hex(fixed_num)
 144     else:
 145         stimulus_a = fixed_num
 146         report = "random"
 147
 148     stimulus_b = [randint(0, 1<<32) for i in range(num_entries)]
 149     yield from run_test_2(dut, stimulus_a, stimulus_b, op)
 150     count += len(stimulus_a)
 151     print (count, "vectors passed 2^32", report)
 152
 153     # non-canonical NaNs.
 154     stimulus_b = [set_exponent(randint(0, 1<<32), 128) \
 155                         for i in range(num_entries)]
 156     yield from run_test_2(dut, stimulus_a, stimulus_b, op)
 157     count += len(stimulus_a)
 158     print (count, "vectors passed Non-Canonical NaN", report)
 159
 160     # -127
 161     stimulus_b = [set_exponent(randint(0, 1<<32), -127) \
 162                         for i in range(num_entries)]
 163     yield from run_test_2(dut, stimulus_a, stimulus_b, op)
 164     count += len(stimulus_a)
 165     print (count, "vectors passed exp=-127", report)
 166
 167     # nearly zero
 168     stimulus_b = [set_exponent(randint(0, 1<<32), -126) \
 169                         for i in range(num_entries)]
 170     yield from run_test_2(dut, stimulus_a, stimulus_b, op)
 171     count += len(stimulus_a)
 172     print (count, "vectors passed exp=-126", report)
 173
 174     # nearly inf
 175     stimulus_b = [set_exponent(randint(0, 1<<32), 127) \
 176                         for i in range(num_entries)]
 177     yield from run_test_2(dut, stimulus_a, stimulus_b, op)
 178     count += len(stimulus_a)
 179     print (count, "vectors passed exp=127", report)
 180
 181     return count
 182
 183 def run_edge_cases(dut, count, op):
 184     #edge cases
 185     for testme in corner_cases:
 186         count = yield from run_cases(dut, count, op, testme, 10)
 187
 188     for i in range(100000):
 189         stimulus_a = [randint(0, 1<<32) for i in range(10)]
 190         count = yield from run_cases(dut, count, op, stimulus_a, 10)
 191     return count
 192