""" Final stage of add reduce
"""
- def __init__(self, n_inputs, output_width, n_parts, partition_points):
- self.i = AddReduceData(partition_points, n_inputs,
- output_width, n_parts)
- self.o = FinalReduceData(partition_points, output_width, n_parts)
+ def __init__(self, n_inputs, output_width, n_parts, partition_points,
+ partition_step=1):
+ self.partition_step = partition_step
self.output_width = output_width
self.n_inputs = n_inputs
self.n_parts = n_parts
if not self.partition_points.fits_in_width(output_width):
raise ValueError("partition_points doesn't fit in output_width")
+ self.i = self.ispec()
+ self.o = self.ospec()
+
+ def ispec(self):
+ return AddReduceData(self.partition_points, self.n_inputs,
+ self.output_width, self.n_parts)
+
+ def ospec(self):
+ return FinalReduceData(self.partition_points,
+ self.output_width, self.n_parts)
+
def elaborate(self, platform):
"""Elaborate this module."""
m = Module()
# base case for adding 2 inputs
assert self.n_inputs == 2
adder = PartitionedAdder(output_width,
- self.i.part_pts, 2)
+ self.i.part_pts, self.partition_step)
m.submodules.final_adder = adder
m.d.comb += adder.a.eq(self.i.terms[0])
m.d.comb += adder.b.eq(self.i.terms[1])
self.n_inputs = n_inputs
self.n_parts = n_parts
self.output_width = output_width
- self.i = AddReduceData(partition_points, n_inputs,
- output_width, n_parts)
self.partition_points = PartitionPoints(partition_points)
if not self.partition_points.fits_in_width(output_width):
raise ValueError("partition_points doesn't fit in output_width")
self.groups = AddReduceSingle.full_adder_groups(n_inputs)
- n_terms = AddReduceSingle.calc_n_inputs(n_inputs, self.groups)
- self.o = AddReduceData(partition_points, n_terms, output_width, n_parts)
+ self.n_terms = AddReduceSingle.calc_n_inputs(n_inputs, self.groups)
+
+ self.i = self.ispec()
+ self.o = self.ospec()
+
+ def ispec(self):
+ return AddReduceData(self.partition_points, self.n_inputs,
+ self.output_width, self.n_parts)
+
+ def ospec(self):
+ return AddReduceData(self.partition_points, self.n_terms,
+ self.output_width, self.n_parts)
@staticmethod
def calc_n_inputs(n_inputs, groups):
supported, except for by ``Signal.eq``.
"""
- def __init__(self, inputs, output_width, partition_points,
- part_ops):
+ def __init__(self, i, output_width, partition_step=1):
"""Create an ``AddReduce``.
:param inputs: input ``Signal``s to be summed.
:param output_width: bit-width of ``output``.
:param partition_points: the input partition points.
"""
- self.inputs = inputs
- self.part_ops = part_ops
+ self.i = i
+ self.inputs = i.terms
+ self.part_ops = i.part_ops
self.output_width = output_width
- self.partition_points = partition_points
+ self.partition_points = i.part_pts
+ self.partition_step = partition_step
self.create_levels()
part_ops = next_level.i.part_ops
next_level = FinalAdd(ilen, self.output_width, n_parts,
- partition_points)
+ partition_points, self.partition_step)
mods.append(next_level)
self.levels = mods
supported, except for by ``Signal.eq``.
"""
- def __init__(self, inputs, output_width, register_levels, partition_points,
- part_ops):
+ def __init__(self, inputs, output_width, register_levels, part_pts,
+ part_ops, partition_step=1):
"""Create an ``AddReduce``.
:param inputs: input ``Signal``s to be summed.
pipeline registers.
:param partition_points: the input partition points.
"""
- AddReduceInternal.__init__(self, inputs, output_width,
- partition_points, part_ops)
+ self._inputs = inputs
+ self._part_pts = part_pts
+ self._part_ops = part_ops
n_parts = len(part_ops)
- self.o = FinalReduceData(partition_points, output_width, n_parts)
+ self.i = AddReduceData(part_pts, len(inputs),
+ output_width, n_parts)
+ AddReduceInternal.__init__(self, self.i, output_width, partition_step)
+ self.o = FinalReduceData(part_pts, output_width, n_parts)
self.register_levels = register_levels
@staticmethod
if level > 0:
yield level - 1
- def create_levels(self):
- """creates reduction levels"""
-
- mods = []
- partition_points = self.partition_points
- part_ops = self.part_ops
- n_parts = len(part_ops)
- inputs = self.inputs
- ilen = len(inputs)
- while True:
- groups = AddReduceSingle.full_adder_groups(len(inputs))
- if len(groups) == 0:
- break
- next_level = AddReduceSingle(ilen, self.output_width, n_parts,
- partition_points)
- mods.append(next_level)
- partition_points = next_level.i.part_pts
- inputs = next_level.o.terms
- ilen = len(inputs)
- part_ops = next_level.i.part_ops
-
- next_level = FinalAdd(ilen, self.output_width, n_parts,
- partition_points)
- mods.append(next_level)
-
- self.levels = mods
-
def elaborate(self, platform):
"""Elaborate this module."""
m = Module()
+ m.d.comb += self.i.eq_from(self._part_pts, self._inputs, self._part_ops)
+
for i, next_level in enumerate(self.levels):
setattr(m.submodules, "next_level%d" % i, next_level)
- partition_points = self.partition_points
- inputs = self.inputs
- part_ops = self.part_ops
- n_parts = len(part_ops)
- n_inputs = len(inputs)
- output_width = self.output_width
- i = AddReduceData(partition_points, n_inputs, output_width, n_parts)
- m.d.comb += i.eq_from(partition_points, inputs, part_ops)
+ i = self.i
for idx in range(len(self.levels)):
mcur = self.levels[idx]
if idx in self.register_levels:
""" Intermediate output modules
"""
- def __init__(self, output_width, n_parts, partition_points):
- self.i = FinalReduceData(partition_points, output_width, n_parts)
- self.o = IntermediateData(partition_points, output_width, n_parts)
+ def __init__(self, output_width, n_parts, part_pts):
+ self.part_pts = part_pts
+ self.output_width = output_width
+ self.n_parts = n_parts
+
+ self.i = self.ispec()
+ self.o = self.ospec()
+
+ def ispec(self):
+ return FinalReduceData(self.part_pts, self.output_width, self.n_parts)
+
+ def ospec(self):
+ return IntermediateData(self.part_pts, self.output_width, self.n_parts)
def elaborate(self, platform):
m = Module()
128,
self.register_levels,
t.o.part_pts,
- t.o.part_ops)
-
- out_part_ops = add_reduce.o.part_ops
- out_part_pts = add_reduce.o.part_pts
+ t.o.part_ops,
+ partition_step=2)
m.submodules.add_reduce = add_reduce
projects / ieee754fpu.git / blobdiff