[Xorp-hackers] Floating-point types in IPC

[Ben Greear]

On 08/30/2011 07:58 AM, Steven Simpson wrote:
> Hi Ben, all,
>
> It's been pointed out to me that there are no floating-point types
> supported by XrlAtom, and we might need them in the ECODE project.  Has
> there been any plan for adding them?  How far did it get?  What stopped it?
>
> I've gone through the motions of adding an fp64 type, conforming to
> IEEE754 binary64, so it should be able to transmit NaN and signed
> zero/infinity.  It maps to an alias fp64_t, which is either double or
> long double.  The implementation uses only C99 functions, so that should
> avoid introducing new dependencies.
>
> I've introduced<libxipc/fp64.h>  which chooses the fp64_t alias, and
> <libxipc/fp64serial.h>  which provides C functions for converting between
> fp64_t and uint_fast64_t.  They should not need to be accessed directly
> by user code, as xrl_atom.hh handles it.
>
> The algorithm has been tested in isolation, but I haven't made a start
> yet on an integrated test - I guess something in libxipc/tests would be
> appropriate.  From what I recall, enable_tests=True is required for
> programs in there.
>
> Let me know if that sounds up to scratch, and I'll send you the patch
> when I have the tests in place.

Sounds good to me.

Thanks,
Ben

>
> Cheers,
>
> Steven
>
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-- 
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com