from nmigen.cli import main, verilog
from math import log
-from ieee754.fpcommon.fpbase import FPNumDecode
+from ieee754.fpcommon.fpbase import FPNumDecode, FPNumBaseRecord
from nmutil.singlepipe import SimpleHandshake, StageChain
from ieee754.fpcommon.fpbase import FPState, FPID
from ieee754.fpcommon.getop import FPADDBaseData
from ieee754.fpcommon.denorm import (FPSCData, FPAddDeNormMod)
+from ieee754.fpmul.align import FPAlignModSingle
class FPMulSpecialCasesMod(Elaboratable):
https://steve.hollasch.net/cgindex/coding/ieeefloat.html
"""
- def __init__(self, width, id_wid):
- self.width = width
- self.id_wid = id_wid
+ def __init__(self, pspec):
+ self.pspec = pspec
self.i = self.ispec()
self.o = self.ospec()
def ispec(self):
- return FPADDBaseData(self.width, self.id_wid)
+ return FPADDBaseData(self.pspec)
def ospec(self):
- return FPSCData(self.width, self.id_wid, False)
+ return FPSCData(self.pspec, False)
def setup(self, m, i):
""" links module to inputs and outputs
def elaborate(self, platform):
m = Module()
- m.submodules.sc_out_z = self.o.z
+ #m.submodules.sc_out_z = self.o.z
# decode: XXX really should move to separate stage
- a1 = FPNumDecode(None, self.width, False)
- b1 = FPNumDecode(None, self.width, False)
- m.submodules.sc_decode_a = a1
- m.submodules.sc_decode_b = b1
+ width = self.pspec.width
+ a1 = FPNumBaseRecord(width, False)
+ b1 = FPNumBaseRecord(width, False)
+ m.submodules.sc_decode_a = a1 = FPNumDecode(None, a1)
+ m.submodules.sc_decode_b = b1 = FPNumDecode(None, b1)
m.d.comb += [a1.v.eq(self.i.a),
b1.v.eq(self.i.b),
self.o.a.eq(a1),
# if a is NaN or b is NaN return NaN
with m.If(abnan):
m.d.comb += self.o.out_do_z.eq(1)
- m.d.comb += self.o.z.nan(1)
+ m.d.comb += self.o.z.nan(0)
# if a is inf return inf (or NaN)
with m.Elif(a1.is_inf):
m.d.comb += self.o.z.inf(sabx)
# b is zero return NaN
with m.If(b1.is_zero):
- m.d.comb += self.o.z.nan(1)
+ m.d.comb += self.o.z.nan(0)
# if b is inf return inf (or NaN)
with m.Elif(b1.is_inf):
m.d.comb += self.o.z.inf(sabx)
# a is zero return NaN
with m.If(a1.is_zero):
- m.d.comb += self.o.z.nan(1)
+ m.d.comb += self.o.z.nan(0)
# if a is zero or b zero return signed-a/b
with m.Elif(obz):
m.d.comb += self.o.out_do_z.eq(0)
m.d.comb += self.o.oz.eq(self.o.z.v)
- m.d.comb += self.o.mid.eq(self.i.mid)
+ m.d.comb += self.o.ctx.eq(self.i.ctx)
return m
"""
self.mod.setup(m, i, self.out_do_z)
m.d.sync += self.out_z.v.eq(self.mod.out_z.v) # only take the output
- m.d.sync += self.out_z.mid.eq(self.mod.o.mid) # (and mid)
+ m.d.sync += self.out_z.ctx.eq(self.mod.o.ctx) # (and context)
def action(self, m):
self.idsync(m)
""" special cases: NaNs, infs, zeros, denormalised
"""
- def __init__(self, width, id_wid):
+ def __init__(self, pspec):
FPState.__init__(self, "special_cases")
- self.width = width
- self.id_wid = id_wid
+ self.pspec = pspec
SimpleHandshake.__init__(self, self) # pipe is its own stage
self.out = self.ospec()
def ispec(self):
- return FPADDBaseData(self.width, self.id_wid) # SpecialCases ispec
+ return FPADDBaseData(self.pspec)
def ospec(self):
- return FPSCData(self.width, self.id_wid, False) # DeNorm ospec
+ return FPSCData(self.pspec, False)
def setup(self, m, i):
""" links module to inputs and outputs
"""
- smod = FPMulSpecialCasesMod(self.width, self.id_wid)
- dmod = FPAddDeNormMod(self.width, self.id_wid, False)
+ smod = FPMulSpecialCasesMod(self.pspec)
+ dmod = FPAddDeNormMod(self.pspec, False)
+ amod = FPAlignModSingle(self.pspec, False)
- chain = StageChain([smod, dmod])
+ chain = StageChain([smod, dmod, amod])
chain.setup(m, i)
# only needed for break-out (early-out)
# self.out_do_z = smod.o.out_do_z
- self.o = dmod.o
+ self.o = amod.o # output is from last .o in the chain
def process(self, i):
return self.o