src/soc/decoder/selectable_int.py

   1 import unittest
   2 from copy import copy
   3 from soc.decoder.power_fields import BitRange
   4 from operator import (add, sub, mul, truediv, mod, or_, and_, xor, neg, inv)
   5
   6
   7 def check_extsign(a, b):
   8     if isinstance(b, FieldSelectableInt):
   9         b = b.get_range()
  10     if isinstance(b, int):
  11         return SelectableInt(b, a.bits)
  12     if b.bits != 256:
  13         return b
  14     return SelectableInt(b.value, a.bits)
  15
  16
  17 class FieldSelectableInt:
  18     """FieldSelectableInt: allows bit-range selection onto another target
  19     """
  20     def __init__(self, si, br):
  21         self.si = si # target selectable int
  22         if isinstance(br, list) or isinstance(br, tuple):
  23             _br = BitRange()
  24             for i, v in enumerate(br):
  25                 _br[i] = v
  26             br = _br
  27         self.br = br # map of indices.
  28
  29     def eq(self, b):
  30         if isinstance(b, SelectableInt):
  31             for i in range(b.bits):
  32                 self[i] = b[i]
  33         else:
  34             self.si = copy(b.si)
  35             self.br = copy(b.br)
  36
  37     def _op(self, op, b):
  38         vi = self.get_range()
  39         vi = op(vi, b)
  40         return self.merge(vi)
  41
  42     def _op1(self, op):
  43         vi = self.get_range()
  44         vi = op(vi)
  45         return self.merge(vi)
  46
  47     def __getitem__(self, key):
  48         print ("getitem", key, self.br)
  49         if isinstance(key, SelectableInt):
  50             key = key.value
  51         if isinstance(key, int):
  52             key = self.br[key] # don't do POWER 1.3.4 bit-inversion
  53             return self.si[key]
  54         if isinstance(key, slice):
  55             key = self.br[key]
  56             return selectconcat(*[self.si[x] for x in key])
  57
  58     def __setitem__(self, key, value):
  59         if isinstance(key, SelectableInt):
  60             key = key.value
  61         key = self.br[key] # don't do POWER 1.3.4 bit-inversion
  62         if isinstance(key, int):
  63             return self.si.__setitem__(key, value)
  64         else:
  65             if not isinstance(value, SelectableInt):
  66                 value = SelectableInt(value, bits=len(key))
  67             for i, k in enumerate(key):
  68                 self.si[k] = value[i]
  69
  70     def __negate__(self):
  71         return self._op1(negate)
  72     def __invert__(self):
  73         return self._op1(inv)
  74     def __add__(self, b):
  75         return self._op(add, b)
  76     def __sub__(self, b):
  77         return self._op(sub, b)
  78     def __mul__(self, b):
  79         return self._op(mul, b)
  80     def __div__(self, b):
  81         return self._op(truediv, b)
  82     def __mod__(self, b):
  83         return self._op(mod, b)
  84     def __and__(self, b):
  85         return self._op(and_, b)
  86     def __or__(self, b):
  87         return self._op(or_, b)
  88     def __xor__(self, b):
  89         return self._op(xor, b)
  90
  91     def get_range(self):
  92         vi = SelectableInt(0, len(self.br))
  93         for k, v in self.br.items():
  94             vi[k] = self.si[v]
  95         return vi
  96
  97     def merge(self, vi):
  98         fi = copy(self)
  99         for i, v in fi.br.items():
 100             fi.si[v] = vi[i]
 101         return fi
 102
 103     def __repr__(self):
 104         return "FieldSelectableInt(si=%s, br=%s)" % (self.si, self.br)
 105
 106
 107 class FieldSelectableIntTestCase(unittest.TestCase):
 108     def test_arith(self):
 109         a = SelectableInt(0b10101, 5)
 110         b = SelectableInt(0b011, 3)
 111         br = BitRange()
 112         br[0] = 0
 113         br[1] = 2
 114         br[2] = 3
 115         fs = FieldSelectableInt(a, br)
 116         c = fs + b
 117         print (c)
 118         #self.assertEqual(c.value, a.value + b.value)
 119
 120     def test_select(self):
 121         a = SelectableInt(0b00001111, 8)
 122         br = BitRange()
 123         br[0] = 0
 124         br[1] = 1
 125         br[2] = 4
 126         br[3] = 5
 127         fs = FieldSelectableInt(a, br)
 128
 129         self.assertEqual(fs.get_range(), 0b0011)
 130
 131     def test_select_range(self):
 132         a = SelectableInt(0b00001111, 8)
 133         br = BitRange()
 134         br[0] = 0
 135         br[1] = 1
 136         br[2] = 4
 137         br[3] = 5
 138         fs = FieldSelectableInt(a, br)
 139
 140         self.assertEqual(fs[2:4], 0b11)
 141
 142         fs[0:2] = 0b10
 143         self.assertEqual(fs.get_range(), 0b1011)
 144
 145
 146
 147 class SelectableInt:
 148     def __init__(self, value, bits):
 149         if isinstance(value, SelectableInt):
 150             value = value.value
 151         mask = (1 << bits) - 1
 152         self.value = value & mask
 153         self.bits = bits
 154
 155     def eq(self, b):
 156         self.value = b.value
 157         self.bits = b.bits
 158
 159     def __add__(self, b):
 160         if isinstance(b, int):
 161             b = SelectableInt(b, self.bits)
 162         b = check_extsign(self, b)
 163         assert b.bits == self.bits
 164         return SelectableInt(self.value + b.value, self.bits)
 165
 166     def __sub__(self, b):
 167         if isinstance(b, int):
 168             b = SelectableInt(b, self.bits)
 169         b = check_extsign(self, b)
 170         assert b.bits == self.bits
 171         return SelectableInt(self.value - b.value, self.bits)
 172
 173     def __rsub__(self, b):
 174         if isinstance(b, int):
 175             b = SelectableInt(b, self.bits)
 176         b = check_extsign(self, b)
 177         assert b.bits == self.bits
 178         return SelectableInt(b.value - self.value, self.bits)
 179
 180     def __radd__(self, b):
 181         if isinstance(b, int):
 182             b = SelectableInt(b, self.bits)
 183         b = check_extsign(self, b)
 184         assert b.bits == self.bits
 185         return SelectableInt(b.value + self.value, self.bits)
 186
 187     def __mul__(self, b):
 188         b = check_extsign(self, b)
 189         assert b.bits == self.bits
 190         return SelectableInt(self.value * b.value, self.bits)
 191
 192     def __div__(self, b):
 193         b = check_extsign(self, b)
 194         assert b.bits == self.bits
 195         return SelectableInt(self.value / b.value, self.bits)
 196
 197     def __mod__(self, b):
 198         b = check_extsign(self, b)
 199         assert b.bits == self.bits
 200         return SelectableInt(self.value % b.value, self.bits)
 201
 202     def __or__(self, b):
 203         b = check_extsign(self, b)
 204         assert b.bits == self.bits
 205         return SelectableInt(self.value | b.value, self.bits)
 206
 207     def __and__(self, b):
 208         print ("__and__", self, b)
 209         b = check_extsign(self, b)
 210         assert b.bits == self.bits
 211         return SelectableInt(self.value & b.value, self.bits)
 212
 213     def __xor__(self, b):
 214         b = check_extsign(self, b)
 215         assert b.bits == self.bits
 216         return SelectableInt(self.value ^ b.value, self.bits)
 217
 218     def __rxor__(self, b):
 219         b = check_extsign(self, b)
 220         assert b.bits == self.bits
 221         return SelectableInt(self.value ^ b.value, self.bits)
 222
 223     def __invert__(self):
 224         return SelectableInt(~self.value, self.bits)
 225
 226     def __neg__(self):
 227         return SelectableInt(~self.value + 1, self.bits)
 228
 229     def __lshift__(self, b):
 230         b = check_extsign(self, b)
 231         return SelectableInt(self.value << b.value, self.bits)
 232
 233     def __rshift__(self, b):
 234         b = check_extsign(self, b)
 235         return SelectableInt(self.value >> b.value, self.bits)
 236
 237     def __getitem__(self, key):
 238         if isinstance(key, int):
 239             assert key < self.bits, "key %d accessing %d" % (key, self.bits)
 240             assert key >= 0
 241             # NOTE: POWER 3.0B annotation order!  see p4 1.3.2
 242             # MSB is indexed **LOWEST** (sigh)
 243             key = self.bits - (key + 1)
 244
 245             value = (self.value >> key) & 1
 246             return SelectableInt(value, 1)
 247         elif isinstance(key, slice):
 248             assert key.step is None or key.step == 1
 249             assert key.start < key.stop
 250             assert key.start >= 0
 251             assert key.stop <= self.bits
 252
 253             stop = self.bits - key.start
 254             start = self.bits - key.stop
 255
 256             bits = stop - start
 257             #print ("__getitem__ slice num bits", bits)
 258             mask = (1 << bits) - 1
 259             value = (self.value >> start) & mask
 260             return SelectableInt(value, bits)
 261
 262     def __setitem__(self, key, value):
 263         if isinstance(key, int):
 264             assert key < self.bits
 265             assert key >= 0
 266             key = self.bits - (key + 1)
 267             if isinstance(value, SelectableInt):
 268                 assert value.bits == 1
 269                 value = value.value
 270
 271             value = value << key
 272             mask = 1 << key
 273             self.value = (self.value & ~mask) | (value & mask)
 274         elif isinstance(key, slice):
 275             assert key.step is None or key.step == 1
 276             assert key.start < key.stop
 277             assert key.start >= 0
 278             assert key.stop <= self.bits
 279
 280             stop = self.bits - key.start
 281             start = self.bits - key.stop
 282
 283             bits = stop - start
 284             #print ("__setitem__ slice num bits", bits)
 285             if isinstance(value, SelectableInt):
 286                 assert value.bits == bits, "%d into %d" % (value.bits, bits)
 287                 value = value.value
 288             mask = ((1 << bits) - 1) << start
 289             value = value << start
 290             self.value = (self.value & ~mask) | (value & mask)
 291
 292     def __ge__(self, other):
 293         if isinstance(other, FieldSelectableInt):
 294             other = other.get_range()
 295         if isinstance(other, SelectableInt):
 296             other = check_extsign(self, other)
 297             assert other.bits == self.bits
 298             other = other.value
 299         if isinstance(other, int):
 300             return onebit(self.value >= other.value)
 301         assert False
 302
 303     def __le__(self, other):
 304         if isinstance(other, FieldSelectableInt):
 305             other = other.get_range()
 306         if isinstance(other, SelectableInt):
 307             other = check_extsign(self, other)
 308             assert other.bits == self.bits
 309             other = other.value
 310         if isinstance(other, int):
 311             return onebit(self.value <= other)
 312         assert False
 313
 314     def __gt__(self, other):
 315         if isinstance(other, FieldSelectableInt):
 316             other = other.get_range()
 317         if isinstance(other, SelectableInt):
 318             other = check_extsign(self, other)
 319             assert other.bits == self.bits
 320             other = other.value
 321         if isinstance(other, int):
 322             return onebit(self.value > other)
 323         assert False
 324
 325     def __lt__(self, other):
 326         if isinstance(other, FieldSelectableInt):
 327             other = other.get_range()
 328         if isinstance(other, SelectableInt):
 329             other = check_extsign(self, other)
 330             assert other.bits == self.bits
 331             other = other.value
 332         if isinstance(other, int):
 333             return onebit(self.value < other)
 334         assert False
 335
 336     def __eq__(self, other):
 337         print ("__eq__", self, other)
 338         if isinstance(other, FieldSelectableInt):
 339             other = other.get_range()
 340         if isinstance(other, SelectableInt):
 341             other = check_extsign(self, other)
 342             assert other.bits == self.bits
 343             other = other.value
 344         if isinstance(other, int):
 345             return onebit(other == self.value)
 346         assert False
 347
 348     def narrow(self, bits):
 349         assert bits <= self.bits
 350         return SelectableInt(self.value, bits)
 351
 352     def __bool__(self):
 353         return self.value != 0
 354
 355     def __repr__(self):
 356         return "SelectableInt(value=0x{:x}, bits={})".format(self.value,
 357                                                            self.bits)
 358
 359     def __len__(self):
 360         return self.bits
 361
 362 def onebit(bit):
 363     return SelectableInt(1 if bit else 0, 1)
 364
 365 def selectltu(lhs, rhs):
 366     """ less-than (unsigned)
 367     """
 368     if isinstance(rhs, SelectableInt):
 369         rhs = rhs.value
 370     return onebit(lhs.value < rhs)
 371
 372 def selectgtu(lhs, rhs):
 373     """ greater-than (unsigned)
 374     """
 375     if isinstance(rhs, SelectableInt):
 376         rhs = rhs.value
 377     return onebit(lhs.value > rhs)
 378
 379
 380 # XXX this probably isn't needed...
 381 def selectassign(lhs, idx, rhs):
 382     if isinstance(idx, tuple):
 383         if len(idx) == 2:
 384             lower, upper = idx
 385             step = None
 386         else:
 387             lower, upper, step = idx
 388         toidx = range(lower, upper, step)
 389         fromidx = range(0, upper-lower, step) # XXX eurgh...
 390     else:
 391         toidx = [idx]
 392         fromidx = [0]
 393     for t, f in zip(toidx, fromidx):
 394         lhs[t] = rhs[f]
 395
 396
 397 def selectconcat(*args, repeat=1):
 398     if repeat != 1 and len(args) == 1 and isinstance(args[0], int):
 399         args = [SelectableInt(args[0], 1)]
 400     if repeat != 1: # multiplies the incoming arguments
 401         tmp = []
 402         for i in range(repeat):
 403             tmp += args
 404         args = tmp
 405     res = copy(args[0])
 406     for i in args[1:]:
 407         if isinstance(i, FieldSelectableInt):
 408             i = i.si
 409         assert isinstance(i, SelectableInt), "can only concat SIs, sorry"
 410         res.bits += i.bits
 411         res.value = (res.value << i.bits) | i.value
 412     print ("concat", repeat, res)
 413     return res
 414
 415
 416 class SelectableIntTestCase(unittest.TestCase):
 417     def test_arith(self):
 418         a = SelectableInt(5, 8)
 419         b = SelectableInt(9, 8)
 420         c = a + b
 421         d = a - b
 422         e = a * b
 423         f = -a
 424         self.assertEqual(c.value, a.value + b.value)
 425         self.assertEqual(d.value, (a.value - b.value) & 0xFF)
 426         self.assertEqual(e.value, (a.value * b.value) & 0xFF)
 427         self.assertEqual(f.value, (-a.value) & 0xFF)
 428         self.assertEqual(c.bits, a.bits)
 429         self.assertEqual(d.bits, a.bits)
 430         self.assertEqual(e.bits, a.bits)
 431
 432     def test_logic(self):
 433         a = SelectableInt(0x0F, 8)
 434         b = SelectableInt(0xA5, 8)
 435         c = a & b
 436         d = a | b
 437         e = a ^ b
 438         f = ~a
 439         self.assertEqual(c.value, a.value & b.value)
 440         self.assertEqual(d.value, a.value | b.value)
 441         self.assertEqual(e.value, a.value ^ b.value)
 442         self.assertEqual(f.value, 0xF0)
 443
 444     def test_get(self):
 445         a = SelectableInt(0xa2, 8)
 446         # These should be big endian
 447         self.assertEqual(a[7], 0)
 448         self.assertEqual(a[0:4], 10)
 449         self.assertEqual(a[4:8], 2)
 450
 451     def test_set(self):
 452         a = SelectableInt(0x5, 8)
 453         a[7] = SelectableInt(0, 1)
 454         self.assertEqual(a, 4)
 455         a[4:8] = 9
 456         self.assertEqual(a, 9)
 457         a[0:4] = 3
 458         self.assertEqual(a, 0x39)
 459         a[0:4] = a[4:8]
 460         self.assertEqual(a, 0x99)
 461
 462     def test_concat(self):
 463         a = SelectableInt(0x1, 1)
 464         c = selectconcat(a, repeat=8)
 465         self.assertEqual(c, 0xff)
 466         self.assertEqual(c.bits, 8)
 467         a = SelectableInt(0x0, 1)
 468         c = selectconcat(a, repeat=8)
 469         self.assertEqual(c, 0x00)
 470         self.assertEqual(c.bits, 8)
 471
 472     def test_repr(self):
 473         for i in range(65536):
 474             a = SelectableInt(i, 16)
 475             b = eval(repr(a))
 476             self.assertEqual(a, b)
 477
 478     def test_cmp(self):
 479         a = SelectableInt(10, bits=8)
 480         b = SelectableInt(5, bits=8)
 481         self.assertTrue(a > b)
 482         self.assertFalse(a < b)
 483         self.assertTrue(a != b)
 484         self.assertFalse(a == b)
 485
 486     def test_unsigned(self):
 487         a = SelectableInt(0x80, bits=8)
 488         b = SelectableInt(0x7f, bits=8)
 489         self.assertTrue(a > b)
 490         self.assertFalse(a < b)
 491         self.assertTrue(a != b)
 492         self.assertFalse(a == b)
 493
 494 if __name__ == "__main__":
 495     unittest.main()