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, mid):
  40     yield dut.in_mid.eq(mid)
  41     yield dut.in_a.v.eq(a)
  42     yield dut.in_a.stb.eq(1)
  43     yield
  44     yield
  45     yield
  46     yield
  47     a_ack = (yield dut.in_a.ack)
  48     assert a_ack == 0
  49
  50     yield dut.in_a.stb.eq(0)
  51
  52     yield dut.in_b.v.eq(b)
  53     yield dut.in_b.stb.eq(1)
  54     yield
  55     yield
  56     b_ack = (yield dut.in_b.ack)
  57     assert b_ack == 0
  58
  59     yield dut.in_b.stb.eq(0)
  60
  61     yield dut.out_z.ack.eq(1)
  62
  63     while True:
  64         out_z_stb = (yield dut.out_z.stb)
  65         if not out_z_stb:
  66             yield
  67             continue
  68         out_z = yield dut.out_z.v
  69         out_mid = yield dut.out_mid
  70         yield dut.out_z.ack.eq(0)
  71         yield
  72         break
  73
  74     return out_z, out_mid
  75
  76 def check_case(dut, a, b, z, mid=None):
  77     if mid is None:
  78         mid = randint(0, 6)
  79     out_z, out_mid = yield from get_case(dut, a, b, mid)
  80     assert out_z == z, "Output z 0x%x not equal to expected 0x%x" % (out_z, z)
  81     assert out_mid == mid, "Output mid 0x%x != expected 0x%x" % (out_mid, mid)
  82
  83
  84 def run_test(dut, stimulus_a, stimulus_b, op):
  85
  86     expected_responses = []
  87     actual_responses = []
  88     for a, b in zip(stimulus_a, stimulus_b):
  89         mid = randint(0, 6)
  90         af = Float32.from_bits(a)
  91         bf = Float32.from_bits(b)
  92         z = op(af, bf)
  93         expected_responses.append((z.get_bits(), mid))
  94         #print (af, bf, z)
  95         actual = yield from get_case(dut, a, b, mid)
  96         actual_responses.append(actual)
  97
  98     if len(actual_responses) < len(expected_responses):
  99         print ("Fail ... not enough results")
 100         exit(0)
 101
 102     for expected, actual, a, b in zip(expected_responses, actual_responses,
 103                                       stimulus_a, stimulus_b):
 104         passed = match(expected[0], actual[0])
 105         if expected[1] != actual[1]: # check mid
 106             print ("MID failed", expected[1], actual[1])
 107             sys.exit(0)
 108
 109         if not passed:
 110
 111             print ("Fail ... expected:", hex(expected), "actual:", hex(actual))
 112
 113             print (hex(a))
 114             print ("a mantissa:", a & 0x7fffff)
 115             print ("a exponent:", ((a & 0x7f800000) >> 23) - 127)
 116             print ("a sign:", ((a & 0x80000000) >> 31))
 117
 118             print (hex(b))
 119             print ("b mantissa:", b & 0x7fffff)
 120             print ("b exponent:", ((b & 0x7f800000) >> 23) - 127)
 121             print ("b sign:", ((b & 0x80000000) >> 31))
 122
 123             print (hex(expected))
 124             print ("expected mantissa:", expected & 0x7fffff)
 125             print ("expected exponent:", ((expected & 0x7f800000) >> 23) - 127)
 126             print ("expected sign:", ((expected & 0x80000000) >> 31))
 127
 128             print (hex(actual))
 129             print ("actual mantissa:", actual & 0x7fffff)
 130             print ("actual exponent:", ((actual & 0x7f800000) >> 23) - 127)
 131             print ("actual sign:", ((actual & 0x80000000) >> 31))
 132
 133             sys.exit(0)
 134
 135 corner_cases = [0x80000000, 0x00000000, 0x7f800000, 0xff800000,
 136                 0x7fc00000, 0xffc00000]
 137
 138 def run_corner_cases(dut, count, op):
 139     #corner cases
 140     from itertools import permutations
 141     stimulus_a = [i[0] for i in permutations(corner_cases, 2)]
 142     stimulus_b = [i[1] for i in permutations(corner_cases, 2)]
 143     yield from run_test(dut, stimulus_a, stimulus_b, op)
 144     count += len(stimulus_a)
 145     print (count, "vectors passed")
 146
 147 def run_test_2(dut, stimulus_a, stimulus_b, op):
 148     yield from run_test(dut, stimulus_a, stimulus_b, op)
 149     yield from run_test(dut, stimulus_b, stimulus_a, op)
 150
 151 def run_cases(dut, count, op, fixed_num, num_entries):
 152     if isinstance(fixed_num, int):
 153         stimulus_a = [fixed_num for i in range(num_entries)]
 154         report = hex(fixed_num)
 155     else:
 156         stimulus_a = fixed_num
 157         report = "random"
 158
 159     stimulus_b = [randint(0, 1<<32) for i in range(num_entries)]
 160     yield from run_test_2(dut, stimulus_a, stimulus_b, op)
 161     count += len(stimulus_a)
 162     print (count, "vectors passed 2^32", report)
 163
 164     # non-canonical NaNs.
 165     stimulus_b = [set_exponent(randint(0, 1<<32), 128) \
 166                         for i in range(num_entries)]
 167     yield from run_test_2(dut, stimulus_a, stimulus_b, op)
 168     count += len(stimulus_a)
 169     print (count, "vectors passed Non-Canonical NaN", report)
 170
 171     # -127
 172     stimulus_b = [set_exponent(randint(0, 1<<32), -127) \
 173                         for i in range(num_entries)]
 174     yield from run_test_2(dut, stimulus_a, stimulus_b, op)
 175     count += len(stimulus_a)
 176     print (count, "vectors passed exp=-127", report)
 177
 178     # nearly zero
 179     stimulus_b = [set_exponent(randint(0, 1<<32), -126) \
 180                         for i in range(num_entries)]
 181     yield from run_test_2(dut, stimulus_a, stimulus_b, op)
 182     count += len(stimulus_a)
 183     print (count, "vectors passed exp=-126", report)
 184
 185     # nearly inf
 186     stimulus_b = [set_exponent(randint(0, 1<<32), 127) \
 187                         for i in range(num_entries)]
 188     yield from run_test_2(dut, stimulus_a, stimulus_b, op)
 189     count += len(stimulus_a)
 190     print (count, "vectors passed exp=127", report)
 191
 192     return count
 193
 194 def run_edge_cases(dut, count, op):
 195     #edge cases
 196     for testme in corner_cases:
 197         count = yield from run_cases(dut, count, op, testme, 10)
 198
 199     for i in range(100000):
 200         stimulus_a = [randint(0, 1<<32) for i in range(10)]
 201         count = yield from run_cases(dut, count, op, stimulus_a, 10)
 202     return count
 203