34 lines
745 B
Python
34 lines
745 B
Python
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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comb = []
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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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comb.append(Case(sel, *cases))
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i += 1
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return comb
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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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