82 lines
1.8 KiB
Python
82 lines
1.8 KiB
Python
from migen.fhdl.structure import *
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from migen.fhdl.structure import _Operator
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from migen.flow.actor import *
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from migen.corelogic.record import *
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from migen.corelogic import divider
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class _SimpleBinary(CombinatorialActor):
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def __init__(self, bv_op, bv_r=None):
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self.bv_op = bv_op
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if bv_r is None:
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bv_r = self.__class__.get_result_bv(bv_op)
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self.bv_r = bv_r
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super().__init__(
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("operands", Sink, [("a", bv_op), ("b", bv_op)]),
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("result", Source, [("r", bv_r)]))
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def get_process_fragment(self):
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return Fragment([
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self.token("result").r.eq(_Operator(self.op,
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[self.token("operands").a, self.token("operands").b]))
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])
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class Add(_SimpleBinary):
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op = "+"
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def get_result_bv(bv):
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return BV(bv.width+1, bv.signed)
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class Sub(_SimpleBinary):
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op = "-"
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def get_result_bv(bv):
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return BV(bv.width+1, bv.signed)
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class Mul(_SimpleBinary):
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op = "*"
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def get_result_bv(bv):
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return BV(2*bv.width, bv.signed)
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class And(_SimpleBinary):
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op = "&"
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def get_result_bv(bv):
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return bv
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class Xor(_SimpleBinary):
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op = "^"
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def get_result_bv(bv):
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return bv
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class Or(_SimpleBinary):
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op = "|"
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def get_result_bv(bv):
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return bv
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class LT(_SimpleBinary):
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op = "<"
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def get_result_bv(bv):
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return BV(1)
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class LE(_SimpleBinary):
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op = "<="
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def get_result_bv(bv):
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return BV(1)
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class EQ(_SimpleBinary):
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op = "=="
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def get_result_bv(bv):
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return BV(1)
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class NE(_SimpleBinary):
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op = "!="
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def get_result_bv(bv):
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return BV(1)
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class DivMod(SequentialActor):
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def __init__(self, width):
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self.div = divider.Divider(width)
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super().__init__(width,
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("operands", Sink, [("dividend", self.div.dividend_i), ("divisor", self.div.divisor_i)]),
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("result", Source, [("quotient", self.div.quotient_o), ("remainder", self.div.remainder_o)]))
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def get_process_fragment(self):
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return self.div.get_fragment() + Fragment([self.div.start_i.eq(self.trigger)])
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