src/ieee754/fpcommon/corrections.py

   1 # IEEE Floating Point Adder (Single Precision)
   2 # Copyright (C) Jonathan P Dawson 2013
   3 # 2013-12-12
   4
   5 from nmigen import Module, Mux
   6 from nmigen.cli import main, verilog
   7
   8 from nmutil.pipemodbase import PipeModBase
   9 from ieee754.fpcommon.fpbase import FPNumBase
  10 from ieee754.fpcommon.roundz import FPRoundData
  11
  12
  13 class FPCorrectionsMod(PipeModBase):
  14
  15     def __init__(self, pspec):
  16         super().__init__(pspec, "corrections")
  17
  18     def ispec(self):
  19         return FPRoundData(self.pspec)
  20
  21     def ospec(self):
  22         return FPRoundData(self.pspec)
  23
  24     def elaborate(self, platform):
  25         m = Module()
  26         comb = m.d.comb
  27         m.submodules.corr_in_z = in_z = FPNumBase(self.i.z)
  28         comb += self.o.eq(self.i) # copies mid, z, out_do_z
  29         comb += self.o.z.e.eq(Mux(in_z.is_denormalised,
  30                                   self.i.z.N127, self.i.z.e))
  31         return m
  32
  33