144 lines
3.6 KiB
Python
144 lines
3.6 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.flow.network 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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def _create(a, b, actor_class):
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assert id(a.dfg) == id(b.dfg)
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dfg = a.dfg
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bva = a.get_dict()["bv_r"]
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bvb = b.get_dict()["bv_r"]
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bv_op = BV(max(bva.width, bvb.width), bva.signed and bvb.signed)
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bv_r = actor_class.get_result_bv(bv_op)
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new_actor = ComposableNode(dfg, actor_class, {"bv_op": bv_op, "bv_r": bv_r})
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dfg.add_connection(a, new_actor, "result", "operands", sink_subr=["a"])
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dfg.add_connection(b, new_actor, "result", "operands", sink_subr=["b"])
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return new_actor
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class ComposableNode(ActorNode):
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def __init__(self, dfg, actor_class, parameters=dict()):
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self.dfg = dfg
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super().__init__(actor_class, parameters)
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def __hash__(self):
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return id(self)
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def __add__(self, other):
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return _create(self, other, Add)
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def __radd__(self, other):
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return _create(other, self, Add)
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def __sub__(self, other):
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return _create(self, other, Sub)
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def __rsub__(self, other):
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return _create(other, self, Sub)
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def __mul__(self, other):
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return _create(self, other, Mul)
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def __rmul__(self, other):
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return _create(other, self, Mul)
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def __and__(self, other):
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return _create(self, other, And)
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def __rand__(self, other):
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return _create(other, self, And)
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def __xor__(self, other):
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return _create(self, other, Xor)
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def __rxor__(self, other):
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return _create(other, self, Xor)
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def __or__(self, other):
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return _create(self, other, Or)
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def __ror__(self, other):
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return _create(other, self, Or)
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def __lt__(self, other):
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return _create(self, other, LT)
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def __le__(self, other):
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return _create(self, other, LE)
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def __eq__(self, other):
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return _create(self, other, EQ)
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def __ne__(self, other):
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return _create(self, other, NE)
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def __gt__(self, other):
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return _create(other, self, LT)
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def __ge__(self, other):
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return _create(other, self, LE)
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