# Copyright (C) Jonathan P Dawson 2013
# 2013-12-12
-from nmigen import Module, Signal, Elaboratable
+from nmigen import Module, Signal
from nmigen.cli import main, verilog
-from fpbase import FPNumOut
-from fpbase import FPState
-from .roundz import FPRoundData
-from singlepipe import Object
+from nmutil.pipemodbase import FPModBase
+from ieee754.fpcommon.fpbase import FPNumBaseRecord, FPNumBase
+from ieee754.fpcommon.roundz import FPRoundData
+from ieee754.fpcommon.getop import FPPipeContext
-class FPPackData(Object):
+class FPPackData:
- def __init__(self, width, id_wid):
- Object.__init__(self)
- self.z = Signal(width, reset_less=True)
- self.mid = Signal(id_wid, reset_less=True)
+ def __init__(self, pspec):
+ width = pspec.width
+ self.z = Signal(width, reset_less=True) # result
+ self.ctx = FPPipeContext(pspec)
+ # this is complicated: it's a workaround, due to the
+ # array-indexing not working properly in nmigen.
+ # self.ports() is used to access the ArrayProxy objects by name,
+ # however it doesn't work recursively. the workaround:
+ # drop the sub-objects into *this* scope and they can be
+ # accessed / set. it's horrible.
+ self.muxid = self.ctx.muxid
+ self.op = self.ctx.op
-class FPPackMod(Elaboratable):
+ def eq(self, i):
+ return [self.z.eq(i.z), self.ctx.eq(i.ctx)]
- def __init__(self, width, id_wid):
- self.width = width
- self.id_wid = id_wid
- self.i = self.ispec()
- self.o = self.ospec()
+ def __iter__(self):
+ yield self.z
+ yield from self.ctx
- def ispec(self):
- return FPRoundData(self.width, self.id_wid)
+ def ports(self):
+ return list(self)
- def ospec(self):
- return FPPackData(self.width, self.id_wid)
- def process(self, i):
- return self.o
+class FPPackMod(FPModBase):
- def setup(self, m, in_z):
- """ links module to inputs and outputs
- """
- m.submodules.pack = self
- m.d.comb += self.i.eq(in_z)
+ def __init__(self, pspec):
+ super().__init__(pspec, "pack")
+
+ def ispec(self):
+ return FPRoundData(self.pspec)
+
+ def ospec(self):
+ return FPPackData(self.pspec)
def elaborate(self, platform):
m = Module()
- z = FPNumOut(self.width, False)
- m.submodules.pack_in_z = self.i.z
- m.submodules.pack_out_z = z
- m.d.comb += self.o.mid.eq(self.i.mid)
+ comb = m.d.comb
+
+ z = FPNumBaseRecord(self.pspec.width, False, name="z")
+ m.submodules.pack_in_z = in_z = FPNumBase(self.i.z)
+
with m.If(~self.i.out_do_z):
- with m.If(self.i.z.is_overflowed):
- m.d.comb += z.inf(self.i.z.s)
+ with m.If(in_z.is_overflowed):
+ comb += z.inf(self.i.z.s)
with m.Else():
- m.d.comb += z.create(self.i.z.s, self.i.z.e, self.i.z.m)
+ comb += z.create(self.i.z.s, self.i.z.e, self.i.z.m)
with m.Else():
- m.d.comb += z.v.eq(self.i.oz)
- m.d.comb += self.o.z.eq(z.v)
- return m
+ comb += z.v.eq(self.i.oz)
+ comb += self.o.ctx.eq(self.i.ctx)
+ comb += self.o.z.eq(z.v)
-class FPPack(FPState):
-
- def __init__(self, width, id_wid):
- FPState.__init__(self, "pack")
- self.mod = FPPackMod(width)
- self.out_z = self.ospec()
-
- def ispec(self):
- return self.mod.ispec()
-
- def ospec(self):
- return self.mod.ospec()
-
- def setup(self, m, in_z):
- """ links module to inputs and outputs
- """
- self.mod.setup(m, in_z)
-
- m.d.sync += self.out_z.v.eq(self.mod.out_z.v)
- m.d.sync += self.out_z.mid.eq(self.mod.o.mid)
-
- def action(self, m):
- m.next = "pack_put_z"
+ return m