# Copyright (C) Jonathan P Dawson 2013
# 2013-12-12
-from nmigen import Module, Signal, Cat, Mux, Array, Const, Elaboratable
+from nmigen import Module, Signal, Elaboratable
from nmigen.lib.coding import PriorityEncoder
from nmigen.cli import main, verilog
from math import log
-from fpbase import FPNumIn, FPNumOut, FPOpIn, Overflow, FPBase, FPNumBase
-from fpbase import MultiShiftRMerge, Trigger
-from nmutil.singlepipe import (ControlBase, StageChain, SimpleHandshake,
- PassThroughStage, PrevControl)
-from nmutil.multipipe import CombMuxOutPipe
-from nmutil.multipipe import PriorityCombMuxInPipe
+from ieee754.fpcommon.fpbase import FPOpIn, FPBase, FPNumBase
+from nmutil.singlepipe import PrevControl
-from fpbase import FPState
from nmutil import nmoperator
m.d.comb += self.out_decode.eq((self.in_op.ready_o) & \
(self.in_op.valid_i_test))
m.submodules.get_op_in = self.in_op
- #m.submodules.get_op_out = self.out_op
with m.If(self.out_decode):
m.d.comb += [
self.out_op.eq(self.in_op.v),
return m
-class FPGetOp(FPState):
- """ gets operand
- """
-
- def __init__(self, in_state, out_state, in_op, width):
- FPState.__init__(self, in_state)
- self.out_state = out_state
- self.mod = FPGetOpMod(width)
- self.in_op = in_op
- self.out_op = Signal(width)
- self.out_decode = Signal(reset_less=True)
-
- def setup(self, m, in_op):
- """ links module to inputs and outputs
- """
- setattr(m.submodules, self.state_from, self.mod)
- m.d.comb += nmoperator.eq(self.mod.in_op, in_op)
- m.d.comb += self.out_decode.eq(self.mod.out_decode)
-
- def action(self, m):
- with m.If(self.out_decode):
- m.next = self.out_state
- m.d.sync += [
- self.in_op.ready_o.eq(0),
- self.out_op.eq(self.mod.out_op)
- ]
- with m.Else():
- m.d.sync += self.in_op.ready_o.eq(1)
-
-
class FPNumBase2Ops:
def __init__(self, width, id_wid, m_extra=True):
self.a = FPNumBase(width, m_extra)
self.b = FPNumBase(width, m_extra)
- self.mid = Signal(id_wid, reset_less=True)
+ self.muxid = Signal(id_wid, reset_less=True)
def eq(self, i):
- return [self.a.eq(i.a), self.b.eq(i.b), self.mid.eq(i.mid)]
+ return [self.a.eq(i.a), self.b.eq(i.b), self.muxid.eq(i.muxid)]
def ports(self):
- return [self.a, self.b, self.mid]
+ return [self.a, self.b, self.muxid]
-class FPADDBaseData:
+class FPPipeContext:
- def __init__(self, width, id_wid):
- self.width = width
- self.id_wid = id_wid
- self.a = Signal(width)
- self.b = Signal(width)
- self.mid = Signal(id_wid, reset_less=True)
+ def __init__(self, pspec):
+ """ creates a pipeline context. currently: operator (op) and muxid
+
+ opkls (within pspec) - the class to create that will be the
+ "operator". instance must have an "eq"
+ function.
+ """
+ self.id_wid = pspec.id_wid
+ self.op_wid = pspec.op_wid
+ self.muxid = Signal(self.id_wid, reset_less=True) # RS multiplex ID
+ opkls = pspec.opkls
+ if opkls is None:
+ self.op = Signal(self.op_wid, reset_less=True)
+ else:
+ self.op = opkls(pspec)
def eq(self, i):
- return [self.a.eq(i.a), self.b.eq(i.b), self.mid.eq(i.mid)]
+ ret = [self.muxid.eq(i.muxid)]
+ ret.append(self.op.eq(i.op))
+ return ret
+
+ def __iter__(self):
+ yield self.muxid
+ yield self.op
def ports(self):
- return [self.a, self.b, self.mid]
+ return list(self)
class FPGet2OpMod(PrevControl):
- def __init__(self, width, id_wid):
+ def __init__(self, width, id_wid, op_wid=None):
PrevControl.__init__(self)
self.width = width
self.id_wid = id_wid
self.o = self.ospec()
def ispec(self):
- return FPADDBaseData(self.width, self.id_wid)
+ return FPBaseData(self.width, self.id_wid, self.op_wid)
def ospec(self):
- return FPADDBaseData(self.width, self.id_wid)
+ return FPBaseData(self.width, self.id_wid, self.op_wid)
def process(self, i):
return self.o
return m
-class FPGet2Op(FPState):
- """ gets operands
- """
-
- def __init__(self, in_state, out_state, width, id_wid):
- FPState.__init__(self, in_state)
- self.out_state = out_state
- self.mod = FPGet2OpMod(width, id_wid)
- self.o = self.ospec()
- self.in_stb = Signal(reset_less=True)
- self.out_ack = Signal(reset_less=True)
- self.out_decode = Signal(reset_less=True)
-
- def ispec(self):
- return self.mod.ispec()
-
- def ospec(self):
- return self.mod.ospec()
-
- def trigger_setup(self, m, in_stb, in_ack):
- """ links stb/ack
- """
- m.d.comb += self.mod.valid_i.eq(in_stb)
- m.d.comb += in_ack.eq(self.mod.ready_o)
-
- def setup(self, m, i):
- """ links module to inputs and outputs
- """
- m.submodules.get_ops = self.mod
- m.d.comb += self.mod.i.eq(i)
- m.d.comb += self.out_ack.eq(self.mod.ready_o)
- m.d.comb += self.out_decode.eq(self.mod.trigger)
-
- def process(self, i):
- return self.o
-
- def action(self, m):
- with m.If(self.out_decode):
- m.next = self.out_state
- m.d.sync += [
- self.mod.ready_o.eq(0),
- self.o.eq(self.mod.o),
- ]
- with m.Else():
- m.d.sync += self.mod.ready_o.eq(1)
-
-
projects / ieee754fpu.git / blobdiff