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shift instead of pow

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This commit is contained in:
jand 2003-08-05 21:33:59 +00:00
parent 5e4b58e519
commit adcd7647ec
1 changed files with 11 additions and 10 deletions
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21
myhdl/_intbv.py
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@ -125,7 +125,7 @@ class intbv(object):
if i <= j:
raise ValueError, "intbv[i:j] requires i > j\n" \
" i, j == %s, %s" % (i, j)
res = intbv((self._val & 2**i-1) >> j, _len=i-j)
res = intbv((self._val & (1L << i)-1) >> j, _len=i-j)
return res
def __setitem__(self, i, val):
@ -133,9 +133,9 @@ class intbv(object):
raise ValueError, "intbv[i] = v requires v in (0, 1)\n" \
" i == %s " % i
if val:
self._val |= (2**i)
self._val |= (1L << i)
else:
self._val &= ~(2**i)
self._val &= ~(1L << i)
def __setslice__(self, i, j, val):
if j == maxint: # default
@ -144,20 +144,21 @@ class intbv(object):
raise ValueError, "intbv[i:j] = v requires j >= 0\n" \
" j == %s" % j
if i == 0: # default
q = self._val % (2**j)
self._val = val * 2**j + q
q = self._val % (1L << j)
self._val = val * (1L << j) + q
self._checkBounds()
return
if i <= j:
raise ValueError, "intbv[i:j] = v requires i > j\n" \
" i, j, v == %s, %s, %s" % (i, j, val)
if val >= 2**(i-j) or val < -2**(i-j):
lim = (1L << (i-j))
if val >= lim or val < -lim:
raise ValueError, "intbv[i:j] = v abs(v) too large\n" \
" i, j, v == %s, %s, %s" % (i, j, val)
mask = (2**(i-j))-1
mask *= 2**j
mask = (1L << (i-j))-1
mask *= (1L << j)
self._val &= ~mask
self._val |= val * 2**j
self._val |= val * (1L << j)
self._checkBounds()
@ -377,7 +378,7 @@ class intbv(object):
def __invert__(self):
if self._len:
return intbv(~self._val & (2**self._len)-1)
return intbv(~self._val & (1L << self._len)-1)
else:
return intbv(~self._val)