2011-12-22 09:46:19 -05:00
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from migen.fhdl.structure import *
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from migen.fhdl.structure import _Operator
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def multimux(sel, inputs, output):
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n = len(inputs)
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i = 0
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2012-02-11 14:56:51 -05:00
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statements = []
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2011-12-22 09:46:19 -05:00
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for osig in output:
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choices = [x[i] for x in inputs]
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cases = [[Constant(j, sel.bv), osig.eq(choices[j])] for j in range(n)]
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cases[n-1][0] = Default()
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2012-02-11 14:56:51 -05:00
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statements.append(Case(sel, *cases))
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2011-12-22 09:46:19 -05:00
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i += 1
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2012-02-11 14:56:51 -05:00
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return statements
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2011-12-22 09:46:19 -05:00
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def optree(op, operands, lb=None, ub=None, default=None):
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if lb is None:
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lb = 0
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if ub is None:
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ub = len(operands)
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l = ub - lb
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if l == 0:
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if default is None:
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raise AttributeError
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else:
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return default
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elif l == 1:
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return operands[lb]
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else:
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s = lb + l//2
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return _Operator(op,
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[optree(op, operands, lb, s, default),
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optree(op, operands, s, ub, default)])
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2012-02-11 05:52:15 -05:00
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def split(v, *counts):
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r = []
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offset = 0
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for n in counts:
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r.append(v[offset:offset+n])
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offset += n
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return tuple(r)
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2012-02-11 14:57:08 -05:00
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2012-02-13 17:10:27 -05:00
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def displacer(signal, shift, output, n=None, reverse=False):
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2012-02-11 14:57:08 -05:00
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if n is None:
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n = 2**shift.bv.width
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w = signal.bv.width
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2012-02-13 17:10:27 -05:00
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if reverse:
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r = reversed(range(n))
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else:
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r = range(n)
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l = [Replicate(shift == i, w) & signal for i in r]
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2012-02-11 14:57:08 -05:00
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return output.eq(Cat(*l))
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2012-02-13 17:10:27 -05:00
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def chooser(signal, shift, output, n=None, reverse=False):
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2012-02-11 14:57:08 -05:00
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if n is None:
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n = 2**shift.bv.width
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2012-02-13 16:28:02 -05:00
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w = output.bv.width
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2012-02-13 17:10:27 -05:00
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cases = []
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for i in range(n):
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if reverse:
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s = n - i - 1
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else:
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s = i
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cases.append([Constant(i, shift.bv), output.eq(signal[s*w:(s+1)*w])])
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2012-02-11 14:57:08 -05:00
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cases[n-1][0] = Default()
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return Case(shift, *cases)
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