src/ieee754/fpcommon/basedata.py

   1 # IEEE Floating Point Adder (Single Precision)
   2 # Copyright (C) 2019 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
   3
   4 from nmigen import Signal
   5 from ieee754.fpcommon.fpbase import FPRoundingMode
   6 from ieee754.fpcommon.getop import FPPipeContext
   7
   8
   9 class FPBaseData:
  10
  11     def __init__(self, pspec):
  12         width = pspec.width
  13         n_ops = pspec.n_ops
  14         self.ctx = FPPipeContext(pspec)
  15         ops = []
  16         for i in range(n_ops):
  17             name = chr(ord("a")+i)
  18             operand = Signal(width, name=name)
  19             setattr(self, name, operand)
  20             ops.append(operand)
  21         self.muxid = self.ctx.muxid # make muxid available here: complicated
  22         self.ops = ops
  23
  24         self.rm = Signal(FPRoundingMode, reset=FPRoundingMode.DEFAULT)
  25         """rounding mode"""
  26
  27     def eq(self, i):
  28         ret = []
  29         for op1, op2 in zip(self.ops, i.ops):
  30             ret.append(op1.eq(op2))
  31         ret.append(self.ctx.eq(i.ctx))
  32         ret.append(self.rm.eq(i.rm))
  33         return ret
  34
  35     def __iter__(self):
  36         if self.ops:
  37             yield from self.ops
  38         yield from self.ctx
  39         yield self.rm
  40
  41     def ports(self):
  42         return list(self)
  43
  44