[cmucl-imp] [cmucl-help] NaN

[james anderson]

good morning;

> On 2017-01-11, at 09:48, Marco Antoniotti <marcoxa at cs.nyu.edu> wrote:
> 
> Thank you James, thank you Stelian.
> 
> The CFFI solution seems very interesting and the codec James pointed me to are also useful.

i sent marco an off-line note, in which i had pointed out some code which figures (among other things) in an amqp implementation, where it is figures in buffer codecs.
for the curious, it is to be found here:

https://github.com/lisp/de.setf.utility/tree/master/codecs/float-codecs.lisp

my memory may be spotty, but i do not recall that it relied on cffi.
the consequence is much the same, in that it arranges the bist in memory, but the mechanism is different.

best regards, from berlin,

> 
> Do you have any ideas about how your code(s) would impact the lower levels of the implementation?  Meaning: the solutions both of you propose essentially use the FFI: any ideas about how such solutions would impact memory management?

you have lost me here.
each of them arranges to write/read a memory word.
the codec version targets an unboxed byte array while the cffi gets a pointer to an arbitrary word. (at least, that is how i read it.)
you might be more successful getting the later onto the stack via a dynamic extent declaration. some lisps let force arrays to the stack, others do not.

is that what you meant?

best regards, from berlin,
> 
> Just curious.
> 
> All the best
> 
> Marco
> 
> 
> 
> 
> 
> 
>> On Jan 11, 2017, at 24:25 , james anderson <james at dydra.com> wrote:
>> 
>> good evening;
>> 
>>> On 2017-01-11, at 00:17, Raymond Toy <toy.raymond at gmail.com> wrote:
>>> 
>>> […]
>>> You will have to figure out how to get LW or your favorite impl to do
>>> something similar.
>> 
>> that is what the code i pointed you at does.
>> 
>> best regards, from berlin,
> 
> --
> Marco Antoniotti
> 
> 
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