[Libre-soc-bugs] [Bug 784] Implement cl* instructions for carry-less operations

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=784

--- Comment #9 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
  95     def elaborate(self, platform):
  96         m = Module()
  97         xor_reduce = BitwiseXorReduce(self.__reduce_inputs())
  98         m.submodules.xor_reduce = xor_reduce
  99         m.d.comb += self.output.eq(xor_reduce.output)
 100         return m

yeah looking at the comment in line 26 that can be entirely
replaced with

from nmutil.util imprt treereduce

     comb += treereduce(self.reduce_inputs(), operator.xor)

please delete BitwiseXorReduce entirely.  if the HDL generated
is complex then have self.reduce_inputs() store its yielded terms
in intermediary Signals (pass m as a parameter to reduce_inputs
in order to do so)

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