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 class SelectableInt:
 147     def __init__(self, value, bits):
 148         if isinstance(value, SelectableInt):
 149             value = value.value
 150         mask = (1 << bits) - 1
 151         self.value = value & mask
 152         self.bits = bits
 153
 154     def eq(self, b):
 155         self.value = b.value
 156         self.bits = b.bits
 157
 158     def __add__(self, b):
 159         if isinstance(b, int):
 160             b = SelectableInt(b, self.bits)
 161         b = check_extsign(self, b)
 162         assert b.bits == self.bits
 163         return SelectableInt(self.value + b.value, self.bits)
 164
 165     def __sub__(self, b):
 166         if isinstance(b, int):
 167             b = SelectableInt(b, self.bits)
 168         b = check_extsign(self, b)
 169         assert b.bits == self.bits
 170         return SelectableInt(self.value - b.value, self.bits)
 171
 172     def __rsub__(self, b):
 173         if isinstance(b, int):
 174             b = SelectableInt(b, self.bits)
 175         b = check_extsign(self, b)
 176         assert b.bits == self.bits
 177         return SelectableInt(b.value - self.value, self.bits)
 178
 179     def __radd__(self, b):
 180         if isinstance(b, int):
 181             b = SelectableInt(b, self.bits)
 182         b = check_extsign(self, b)
 183         assert b.bits == self.bits
 184         return SelectableInt(b.value + self.value, self.bits)
 185
 186     def __mul__(self, b):
 187         b = check_extsign(self, b)
 188         assert b.bits == self.bits
 189         return SelectableInt(self.value * b.value, self.bits)
 190
 191     def __div__(self, b):
 192         b = check_extsign(self, b)
 193         assert b.bits == self.bits
 194         return SelectableInt(self.value / b.value, self.bits)
 195
 196     def __mod__(self, b):
 197         b = check_extsign(self, b)
 198         assert b.bits == self.bits
 199         return SelectableInt(self.value % b.value, self.bits)
 200
 201     def __or__(self, b):
 202         b = check_extsign(self, b)
 203         assert b.bits == self.bits
 204         return SelectableInt(self.value | b.value, self.bits)
 205
 206     def __and__(self, b):
 207         print ("__and__", self, b)
 208         b = check_extsign(self, b)
 209         assert b.bits == self.bits
 210         return SelectableInt(self.value & b.value, self.bits)
 211
 212     def __xor__(self, b):
 213         b = check_extsign(self, b)
 214         assert b.bits == self.bits
 215         return SelectableInt(self.value ^ b.value, self.bits)
 216
 217     def __rxor__(self, b):
 218         b = check_extsign(self, b)
 219         assert b.bits == self.bits
 220         return SelectableInt(self.value ^ b.value, self.bits)
 221
 222     def __invert__(self):
 223         return SelectableInt(~self.value, self.bits)
 224
 225     def __neg__(self):
 226         return SelectableInt(~self.value + 1, self.bits)
 227
 228     def __lshift__(self, b):
 229         b = check_extsign(self, b)
 230         return SelectableInt(self.value << b.value, self.bits)
 231
 232     def __rshift__(self, b):
 233         b = check_extsign(self, b)
 234         return SelectableInt(self.value >> b.value, self.bits)
 235
 236     def __getitem__(self, key):
 237         if isinstance(key, SelectableInt):
 238             key = key.value
 239         if isinstance(key, int):
 240             assert key < self.bits, "key %d accessing %d" % (key, self.bits)
 241             assert key >= 0
 242             # NOTE: POWER 3.0B annotation order!  see p4 1.3.2
 243             # MSB is indexed **LOWEST** (sigh)
 244             key = self.bits - (key + 1)
 245
 246             value = (self.value >> key) & 1
 247             return SelectableInt(value, 1)
 248         elif isinstance(key, slice):
 249             assert key.step is None or key.step == 1
 250             assert key.start < key.stop
 251             assert key.start >= 0
 252             assert key.stop <= self.bits
 253
 254             stop = self.bits - key.start
 255             start = self.bits - key.stop
 256
 257             bits = stop - start
 258             #print ("__getitem__ slice num bits", bits)
 259             mask = (1 << bits) - 1
 260             value = (self.value >> start) & mask
 261             return SelectableInt(value, bits)
 262
 263     def __setitem__(self, key, value):
 264         if isinstance(key, SelectableInt):
 265             key = key.value
 266         if isinstance(key, int):
 267             assert key < self.bits
 268             assert key >= 0
 269             key = self.bits - (key + 1)
 270             if isinstance(value, SelectableInt):
 271                 assert value.bits == 1
 272                 value = value.value
 273
 274             value = value << key
 275             mask = 1 << key
 276             self.value = (self.value & ~mask) | (value & mask)
 277         elif isinstance(key, slice):
 278             assert key.step is None or key.step == 1
 279             assert key.start < key.stop
 280             assert key.start >= 0
 281             assert key.stop <= self.bits
 282
 283             stop = self.bits - key.start
 284             start = self.bits - key.stop
 285
 286             bits = stop - start
 287             #print ("__setitem__ slice num bits", bits)
 288             if isinstance(value, SelectableInt):
 289                 assert value.bits == bits, "%d into %d" % (value.bits, bits)
 290                 value = value.value
 291             mask = ((1 << bits) - 1) << start
 292             value = value << start
 293             self.value = (self.value & ~mask) | (value & mask)
 294
 295     def __ge__(self, other):
 296         if isinstance(other, FieldSelectableInt):
 297             other = other.get_range()
 298         if isinstance(other, SelectableInt):
 299             other = check_extsign(self, other)
 300             assert other.bits == self.bits
 301             other = other.value
 302         if isinstance(other, int):
 303             return onebit(self.value >= other.value)
 304         assert False
 305
 306     def __le__(self, other):
 307         if isinstance(other, FieldSelectableInt):
 308             other = other.get_range()
 309         if isinstance(other, SelectableInt):
 310             other = check_extsign(self, other)
 311             assert other.bits == self.bits
 312             other = other.value
 313         if isinstance(other, int):
 314             return onebit(self.value <= other)
 315         assert False
 316
 317     def __gt__(self, other):
 318         if isinstance(other, FieldSelectableInt):
 319             other = other.get_range()
 320         if isinstance(other, SelectableInt):
 321             other = check_extsign(self, other)
 322             assert other.bits == self.bits
 323             other = other.value
 324         if isinstance(other, int):
 325             return onebit(self.value > other)
 326         assert False
 327
 328     def __lt__(self, other):
 329         if isinstance(other, FieldSelectableInt):
 330             other = other.get_range()
 331         if isinstance(other, SelectableInt):
 332             other = check_extsign(self, other)
 333             assert other.bits == self.bits
 334             other = other.value
 335         if isinstance(other, int):
 336             return onebit(self.value < other)
 337         assert False
 338
 339     def __eq__(self, other):
 340         print ("__eq__", self, other)
 341         if isinstance(other, FieldSelectableInt):
 342             other = other.get_range()
 343         if isinstance(other, SelectableInt):
 344             other = check_extsign(self, other)
 345             assert other.bits == self.bits
 346             other = other.value
 347         if isinstance(other, int):
 348             return onebit(other == self.value)
 349         assert False
 350
 351     def narrow(self, bits):
 352         assert bits <= self.bits
 353         return SelectableInt(self.value, bits)
 354
 355     def __bool__(self):
 356         return self.value != 0
 357
 358     def __repr__(self):
 359         return "SelectableInt(value=0x{:x}, bits={})".format(self.value,
 360                                                            self.bits)
 361
 362     def __len__(self):
 363         return self.bits
 364
 365     def asint(self):
 366         return self.value
 367
 368
 369 def onebit(bit):
 370     return SelectableInt(1 if bit else 0, 1)
 371
 372 def selectltu(lhs, rhs):
 373     """ less-than (unsigned)
 374     """
 375     if isinstance(rhs, SelectableInt):
 376         rhs = rhs.value
 377     return onebit(lhs.value < rhs)
 378
 379 def selectgtu(lhs, rhs):
 380     """ greater-than (unsigned)
 381     """
 382     if isinstance(rhs, SelectableInt):
 383         rhs = rhs.value
 384     return onebit(lhs.value > rhs)
 385
 386
 387 # XXX this probably isn't needed...
 388 def selectassign(lhs, idx, rhs):
 389     if isinstance(idx, tuple):
 390         if len(idx) == 2:
 391             lower, upper = idx
 392             step = None
 393         else:
 394             lower, upper, step = idx
 395         toidx = range(lower, upper, step)
 396         fromidx = range(0, upper-lower, step) # XXX eurgh...
 397     else:
 398         toidx = [idx]
 399         fromidx = [0]
 400     for t, f in zip(toidx, fromidx):
 401         lhs[t] = rhs[f]
 402
 403
 404 def selectconcat(*args, repeat=1):
 405     if repeat != 1 and len(args) == 1 and isinstance(args[0], int):
 406         args = [SelectableInt(args[0], 1)]
 407     if repeat != 1: # multiplies the incoming arguments
 408         tmp = []
 409         for i in range(repeat):
 410             tmp += args
 411         args = tmp
 412     res = copy(args[0])
 413     for i in args[1:]:
 414         if isinstance(i, FieldSelectableInt):
 415             i = i.si
 416         assert isinstance(i, SelectableInt), "can only concat SIs, sorry"
 417         res.bits += i.bits
 418         res.value = (res.value << i.bits) | i.value
 419     print ("concat", repeat, res)
 420     return res
 421
 422
 423 class SelectableIntTestCase(unittest.TestCase):
 424     def test_arith(self):
 425         a = SelectableInt(5, 8)
 426         b = SelectableInt(9, 8)
 427         c = a + b
 428         d = a - b
 429         e = a * b
 430         f = -a
 431         self.assertEqual(c.value, a.value + b.value)
 432         self.assertEqual(d.value, (a.value - b.value) & 0xFF)
 433         self.assertEqual(e.value, (a.value * b.value) & 0xFF)
 434         self.assertEqual(f.value, (-a.value) & 0xFF)
 435         self.assertEqual(c.bits, a.bits)
 436         self.assertEqual(d.bits, a.bits)
 437         self.assertEqual(e.bits, a.bits)
 438
 439     def test_logic(self):
 440         a = SelectableInt(0x0F, 8)
 441         b = SelectableInt(0xA5, 8)
 442         c = a & b
 443         d = a | b
 444         e = a ^ b
 445         f = ~a
 446         self.assertEqual(c.value, a.value & b.value)
 447         self.assertEqual(d.value, a.value | b.value)
 448         self.assertEqual(e.value, a.value ^ b.value)
 449         self.assertEqual(f.value, 0xF0)
 450
 451     def test_get(self):
 452         a = SelectableInt(0xa2, 8)
 453         # These should be big endian
 454         self.assertEqual(a[7], 0)
 455         self.assertEqual(a[0:4], 10)
 456         self.assertEqual(a[4:8], 2)
 457
 458     def test_set(self):
 459         a = SelectableInt(0x5, 8)
 460         a[7] = SelectableInt(0, 1)
 461         self.assertEqual(a, 4)
 462         a[4:8] = 9
 463         self.assertEqual(a, 9)
 464         a[0:4] = 3
 465         self.assertEqual(a, 0x39)
 466         a[0:4] = a[4:8]
 467         self.assertEqual(a, 0x99)
 468
 469     def test_concat(self):
 470         a = SelectableInt(0x1, 1)
 471         c = selectconcat(a, repeat=8)
 472         self.assertEqual(c, 0xff)
 473         self.assertEqual(c.bits, 8)
 474         a = SelectableInt(0x0, 1)
 475         c = selectconcat(a, repeat=8)
 476         self.assertEqual(c, 0x00)
 477         self.assertEqual(c.bits, 8)
 478
 479     def test_repr(self):
 480         for i in range(65536):
 481             a = SelectableInt(i, 16)
 482             b = eval(repr(a))
 483             self.assertEqual(a, b)
 484
 485     def test_cmp(self):
 486         a = SelectableInt(10, bits=8)
 487         b = SelectableInt(5, bits=8)
 488         self.assertTrue(a > b)
 489         self.assertFalse(a < b)
 490         self.assertTrue(a != b)
 491         self.assertFalse(a == b)
 492
 493     def test_unsigned(self):
 494         a = SelectableInt(0x80, bits=8)
 495         b = SelectableInt(0x7f, bits=8)
 496         self.assertTrue(a > b)
 497         self.assertFalse(a < b)
 498         self.assertTrue(a != b)
 499         self.assertFalse(a == b)
 500
 501 if __name__ == "__main__":
 502     unittest.main()