raise ValueError("point must be a non-negative integer")
self[point] = Value.wrap(enabled)
- def like(self, name=None, src_loc_at=0):
+ def like(self, name=None, src_loc_at=0, mul=1):
"""Create a new ``PartitionPoints`` with ``Signal``s for all values.
:param name: the base name for the new ``Signal``s.
+ :param mul: a multiplication factor on the indices
"""
if name is None:
name = Signal(src_loc_at=1+src_loc_at).name # get variable name
retval = PartitionPoints()
for point, enabled in self.items():
+ point *= mul
retval[point] = Signal(enabled.shape(), name=f"{name}_{point}")
return retval
return m
+class Parts(Elaboratable):
+
+ def __init__(self, pbwid, epps, n_parts):
+ self.pbwid = pbwid
+ # inputs
+ self.epps = PartitionPoints.like(epps, name="epps") # expanded points
+ # outputs
+ self.parts = [Signal(name=f"part_{i}") for i in range(n_parts)]
+
+ def elaborate(self, platform):
+ m = Module()
+
+ epps, parts = self.epps, self.parts
+ # collect part-bytes (double factor because the input is extended)
+ pbs = Signal(self.pbwid, reset_less=True)
+ tl = []
+ for i in range(self.pbwid):
+ pb = Signal(name="pb%d" % i, reset_less=True)
+ m.d.comb += pb.eq(epps.part_byte(i, mfactor=2)) # double
+ tl.append(pb)
+ m.d.comb += pbs.eq(Cat(*tl))
+
+ # negated-temporary copy of partition bits
+ npbs = Signal.like(pbs, reset_less=True)
+ m.d.comb += npbs.eq(~pbs)
+ byte_count = 8 // len(parts)
+ for i in range(len(parts)):
+ pbl = []
+ pbl.append(npbs[i * byte_count - 1])
+ for j in range(i * byte_count, (i + 1) * byte_count - 1):
+ pbl.append(pbs[j])
+ pbl.append(npbs[(i + 1) * byte_count - 1])
+ value = Signal(len(pbl), name="value_%d" % i, reset_less=True)
+ m.d.comb += value.eq(Cat(*pbl))
+ m.d.comb += parts[i].eq(~(value).bool())
+
+ return m
+
+
class Part(Elaboratable):
""" a key class which, depending on the partitioning, will determine
what action to take when parts of the output are signed or unsigned.
the extra terms - as separate terms - are then thrown at the
AddReduce alongside the multiplication part-results.
"""
- def __init__(self, width, n_parts, n_levels, pbwid):
+ def __init__(self, epps, width, n_parts, n_levels, pbwid):
+
+ self.pbwid = pbwid
+ self.epps = epps
# inputs
self.a = Signal(64)
# outputs
self.parts = [Signal(name=f"part_{i}") for i in range(n_parts)]
- self.delayed_parts = [
- [Signal(name=f"delayed_part_{delay}_{i}")
- for i in range(n_parts)]
- for delay in range(n_levels)]
- # XXX REALLY WEIRD BUG - have to take a copy of the last delayed_parts
- self.dplast = [Signal(name=f"dplast_{i}")
- for i in range(n_parts)]
self.not_a_term = Signal(width)
self.neg_lsb_a_term = Signal(width)
def elaborate(self, platform):
m = Module()
- pbs, parts, delayed_parts = self.pbs, self.parts, self.delayed_parts
- # negated-temporary copy of partition bits
+ pbs, parts = self.pbs, self.parts
+ epps = self.epps
+ m.submodules.p = p = Parts(self.pbwid, epps, len(parts))
+ m.d.comb += p.epps.eq(epps)
+ parts = p.parts
+
npbs = Signal.like(pbs, reset_less=True)
- m.d.comb += npbs.eq(~pbs)
byte_count = 8 // len(parts)
- for i in range(len(parts)):
- pbl = []
- pbl.append(npbs[i * byte_count - 1])
- for j in range(i * byte_count, (i + 1) * byte_count - 1):
- pbl.append(pbs[j])
- pbl.append(npbs[(i + 1) * byte_count - 1])
- value = Signal(len(pbl), name="value_%di" % i, reset_less=True)
- m.d.comb += value.eq(Cat(*pbl))
- m.d.comb += parts[i].eq(~(value).bool())
- m.d.comb += delayed_parts[0][i].eq(parts[i])
- m.d.sync += [delayed_parts[j + 1][i].eq(delayed_parts[j][i])
- for j in range(len(delayed_parts)-1)]
- m.d.comb += self.dplast[i].eq(delayed_parts[-1][i])
not_a_term, neg_lsb_a_term, not_b_term, neg_lsb_b_term = \
self.not_a_term, self.neg_lsb_a_term, \
m.d.comb += pbs.eq(Cat(*tl))
# create (doubled) PartitionPoints (output is double input width)
- expanded_part_pts = PartitionPoints()
+ expanded_part_pts = eps = PartitionPoints()
for i, v in self.part_pts.items():
ep = Signal(name=f"expanded_part_pts_{i*2}", reset_less=True)
expanded_part_pts[i * 2] = ep
m.d.comb += s.part_ops.eq(self.part_ops[i])
n_levels = len(self.register_levels)+1
- m.submodules.part_8 = part_8 = Part(128, 8, n_levels, 8)
- m.submodules.part_16 = part_16 = Part(128, 4, n_levels, 8)
- m.submodules.part_32 = part_32 = Part(128, 2, n_levels, 8)
- m.submodules.part_64 = part_64 = Part(128, 1, n_levels, 8)
+ m.submodules.part_8 = part_8 = Part(eps, 128, 8, n_levels, 8)
+ m.submodules.part_16 = part_16 = Part(eps, 128, 4, n_levels, 8)
+ m.submodules.part_32 = part_32 = Part(eps, 128, 2, n_levels, 8)
+ m.submodules.part_64 = part_64 = Part(eps, 128, 1, n_levels, 8)
nat_l, nbt_l, nla_l, nlb_l = [], [], [], []
for mod in [part_8, part_16, part_32, part_64]:
m.d.comb += mod.a.eq(self.a)
self.part_ops)
out_part_ops = add_reduce.levels[-1].out_part_ops
+ out_part_pts = add_reduce.levels[-1]._reg_partition_points
m.submodules.add_reduce = add_reduce
m.d.comb += self._intermediate_output.eq(add_reduce.output)
for i in range(8):
m.d.comb += io8.part_ops[i].eq(out_part_ops[i])
+ m.submodules.p_8 = p_8 = Parts(8, eps, len(part_8.parts))
+ m.submodules.p_16 = p_16 = Parts(8, eps, len(part_16.parts))
+ m.submodules.p_32 = p_32 = Parts(8, eps, len(part_32.parts))
+ m.submodules.p_64 = p_64 = Parts(8, eps, len(part_64.parts))
+
+ m.d.comb += p_8.epps.eq(out_part_pts)
+ m.d.comb += p_16.epps.eq(out_part_pts)
+ m.d.comb += p_32.epps.eq(out_part_pts)
+ m.d.comb += p_64.epps.eq(out_part_pts)
+
# final output
m.submodules.finalout = finalout = FinalOut(64)
- for i in range(len(part_8.delayed_parts[-1])):
- m.d.comb += finalout.d8[i].eq(part_8.dplast[i])
- for i in range(len(part_16.delayed_parts[-1])):
- m.d.comb += finalout.d16[i].eq(part_16.dplast[i])
- for i in range(len(part_32.delayed_parts[-1])):
- m.d.comb += finalout.d32[i].eq(part_32.dplast[i])
+ for i in range(len(part_8.parts)):
+ m.d.comb += finalout.d8[i].eq(p_8.parts[i])
+ for i in range(len(part_16.parts)):
+ m.d.comb += finalout.d16[i].eq(p_16.parts[i])
+ for i in range(len(part_32.parts)):
+ m.d.comb += finalout.d32[i].eq(p_32.parts[i])
m.d.comb += finalout.i8.eq(io8.output)
m.d.comb += finalout.i16.eq(io16.output)
m.d.comb += finalout.i32.eq(io32.output)
projects / ieee754fpu.git / blobdiff