[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 #29 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #28)

> just occurred to me that:

> is equivalent to:
> > self.out.eq(both_ones < different) # unsigned compare

that's hilarious. i Grok that from the Power ISA ops,
from Paul and Anton's microwatt work.

> that said, imho we should leave it as the addition version

hm hm as a "<" it intuitively makes sense to me where carry
wasn't. and yosys (etc) may have an easier time. leave it
with you to decide, i'm happy either way.

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