src/ieee754/fpcommon/test/unit_test_half.py

   1 from random import randint
   2 from random import seed
   3
   4 import sys
   5 from sfpy import Float16
   6
   7 def get_mantissa(x):
   8     return 0x3ff & x
   9
  10 def get_exponent(x):
  11     return ((x & 0xf800) >> 11) - 15
  12
  13 def get_sign(x):
  14     return ((x & 0x8000) >> 15)
  15
  16 def is_nan(x):
  17     return get_exponent(x) == 16 and get_mantissa(x) != 0
  18
  19 def is_inf(x):
  20     return get_exponent(x) == 16 and get_mantissa(x) == 0
  21
  22 def is_pos_inf(x):
  23     return is_inf(x) and not get_sign(x)
  24
  25 def is_neg_inf(x):
  26     return is_inf(x) and get_sign(x)
  27
  28 def match(x, y):
  29     return (
  30         (is_pos_inf(x) and is_pos_inf(y)) or
  31         (is_neg_inf(x) and is_neg_inf(y)) or
  32         (is_nan(x) and is_nan(y)) or
  33         (x == y)
  34         )
  35
  36 def get_case(dut, a, b):
  37     yield dut.in_a.v.eq(a)
  38     yield dut.in_a.stb.eq(1)
  39     yield
  40     yield
  41     a_ack = (yield dut.in_a.ack)
  42     assert a_ack == 0
  43     yield dut.in_b.v.eq(b)
  44     yield dut.in_b.stb.eq(1)
  45     b_ack = (yield dut.in_b.ack)
  46     assert b_ack == 0
  47
  48     while True:
  49         yield
  50         out_z_stb = (yield dut.out_z.stb)
  51         if not out_z_stb:
  52             continue
  53         yield dut.in_a.stb.eq(0)
  54         yield dut.in_b.stb.eq(0)
  55         yield dut.out_z.ack.eq(1)
  56         yield
  57         yield dut.out_z.ack.eq(0)
  58         yield
  59         yield
  60         break
  61
  62     out_z = yield dut.out_z.v
  63     return out_z
  64
  65 def check_case(dut, a, b, z):
  66     out_z = yield from get_case(dut, a, b)
  67     assert out_z == z, "Output z 0x%x not equal to expected 0x%x" % (out_z, z)
  68
  69
  70 def run_test(dut, stimulus_a, stimulus_b, op):
  71
  72     expected_responses = []
  73     actual_responses = []
  74     for a, b in zip(stimulus_a, stimulus_b):
  75         af = Float16.from_bits(a)
  76         bf = Float16.from_bits(b)
  77         z = op(af, bf)
  78         expected_responses.append(z.get_bits())
  79         #print (af, bf, z)
  80         actual = yield from get_case(dut, a, b)
  81         actual_responses.append(actual)
  82
  83     if len(actual_responses) < len(expected_responses):
  84         print ("Fail ... not enough results")
  85         exit(0)
  86
  87     for expected, actual, a, b in zip(expected_responses, actual_responses,
  88                                       stimulus_a, stimulus_b):
  89         passed = match(expected, actual)
  90
  91         if not passed:
  92
  93             print ("Fail ... expected:", hex(expected), "actual:", hex(actual))
  94
  95             print (hex(a))
  96             print ("a mantissa:", get_mantissa(a))
  97             print ("a exponent:", get_exponent(a))
  98             print ("a sign:", get_sign(a))
  99
 100             print (hex(b))
 101             print ("b mantissa:", get_mantissa(b))
 102             print ("b exponent:", get_exponent(b))
 103             print ("b sign:", get_sign(b))
 104
 105             print (hex(expected))
 106             print ("expected mantissa:", get_mantissa(expected))
 107             print ("expected exponent:", get_exponent(expected))
 108             print ("expected sign:", get_sign(expected))
 109
 110             print (hex(actual))
 111             print ("actual mantissa:", get_mantissa(actual))
 112             print ("actual exponent:", get_exponent(actual))
 113             print ("actual sign:", get_sign(actual))
 114
 115             sys.exit(0)
 116
 117 def run_corner_cases(dut, count, op):
 118     #corner cases
 119     corners = [0x8000, 0x0000, 0x7800, 0xf800, 0x7c00, 0xfc00]
 120     from itertools import permutations
 121     stimulus_a = [i[0] for i in permutations(corners, 2)]
 122     stimulus_b = [i[1] for i in permutations(corners, 2)]
 123     yield from run_test(dut, stimulus_a, stimulus_b, op)
 124     count += len(stimulus_a)
 125     print (count, "vectors passed")
 126
 127
 128 def run_edge_cases(dut, count, op, maxcount=10, num_loops=1000):
 129     maxint16 = 1<<16
 130     #edge cases
 131     stimulus_a = [0x8000 for i in range(maxcount)]
 132     stimulus_b = [randint(0, maxint16-1) for i in range(maxcount)]
 133     yield from run_test(dut, stimulus_a, stimulus_b, op)
 134     count += len(stimulus_a)
 135     print (count, "vectors passed")
 136
 137     stimulus_a = [0x0000 for i in range(maxcount)]
 138     stimulus_b = [randint(0, maxint16-1) for i in range(maxcount)]
 139     yield from run_test(dut, stimulus_a, stimulus_b, op)
 140     count += len(stimulus_a)
 141     print (count, "vectors passed")
 142
 143     stimulus_b = [0x8000 for i in range(maxcount)]
 144     stimulus_a = [randint(0, maxint16-1) for i in range(maxcount)]
 145     yield from run_test(dut, stimulus_a, stimulus_b, op)
 146     count += len(stimulus_a)
 147     print (count, "vectors passed")
 148
 149     stimulus_b = [0x0000 for i in range(maxcount)]
 150     stimulus_a = [randint(0, maxint16-1) for i in range(maxcount)]
 151     yield from run_test(dut, stimulus_a, stimulus_b, op)
 152     count += len(stimulus_a)
 153     print (count, "vectors passed")
 154
 155     stimulus_a = [0x7800 for i in range(maxcount)]
 156     stimulus_b = [randint(0, maxint16-1) for i in range(maxcount)]
 157     yield from run_test(dut, stimulus_a, stimulus_b, op)
 158     count += len(stimulus_a)
 159     print (count, "vectors passed")
 160
 161     stimulus_a = [0xF800 for i in range(maxcount)]
 162     stimulus_b = [randint(0, maxint16-1) for i in range(maxcount)]
 163     yield from run_test(dut, stimulus_a, stimulus_b, op)
 164     count += len(stimulus_a)
 165     print (count, "vectors passed")
 166
 167     stimulus_b = [0x7800 for i in range(maxcount)]
 168     stimulus_a = [randint(0, maxint16-1) for i in range(maxcount)]
 169     yield from run_test(dut, stimulus_a, stimulus_b, op)
 170     count += len(stimulus_a)
 171     print (count, "vectors passed")
 172
 173     stimulus_b = [0xF800 for i in range(maxcount)]
 174     stimulus_a = [randint(0, maxint16-1) for i in range(maxcount)]
 175     yield from run_test(dut, stimulus_a, stimulus_b, op)
 176     count += len(stimulus_a)
 177     print (count, "vectors passed")
 178
 179     stimulus_a = [0x7C00 for i in range(maxcount)]
 180     stimulus_b = [randint(0, maxint16-1) for i in range(maxcount)]
 181     yield from run_test(dut, stimulus_a, stimulus_b, op)
 182     count += len(stimulus_a)
 183     print (count, "vectors passed")
 184
 185     stimulus_a = [0xFC00 for i in range(maxcount)]
 186     stimulus_b = [randint(0, maxint16-1) for i in range(maxcount)]
 187     yield from run_test(dut, stimulus_a, stimulus_b, op)
 188     count += len(stimulus_a)
 189     print (count, "vectors passed")
 190
 191     stimulus_b = [0x7C00 for i in range(maxcount)]
 192     stimulus_a = [randint(0, maxint16-1) for i in range(maxcount)]
 193     yield from run_test(dut, stimulus_a, stimulus_b, op)
 194     count += len(stimulus_a)
 195     print (count, "vectors passed")
 196
 197     stimulus_b = [0xFC00 for i in range(maxcount)]
 198     stimulus_a = [randint(0, maxint16-1) for i in range(maxcount)]
 199     yield from run_test(dut, stimulus_a, stimulus_b, op)
 200     count += len(stimulus_a)
 201     print (count, "vectors passed")
 202
 203     #seed(0)
 204     for i in range(num_loops):
 205         stimulus_a = [randint(0, maxint16-1) for i in range(maxcount)]
 206         stimulus_b = [randint(0, maxint16-1) for i in range(maxcount)]
 207         yield from run_test(dut, stimulus_a, stimulus_b, op)
 208         count += maxcount
 209         print (count, "random vectors passed")
 210