[speex-dev] XScale realtime encoding possible?

[Jean-Marc Valin]

Le lun 10/11/2003 à 11:19, Massimo a écrit :
> On Sun, 2003-11-09 at 21:00, Jean-Marc Valin wrote: 
>         On recent x86 processors, floating point is faster than fixed-point.
>         
>         	Jean-Marc
>         
> This left me something shocked. Please, can you tell me what kind of
> processors are showing this behaviour? Are you referring to speex
> codec performance or to general performance? 
> Sorry to drive this a little off-topic but my XP1800 seems to be much
> faster with integer (when this is applicable). 

There are two reasons. First, integer multiplications tend to take a
little longer than float. The second reason is that in order to convert
from float to int, there are several cases where one float operation is
replaced by more than one integer operation.

        Jean-Marc


-- 
Jean-Marc Valin, M.Sc.A., ing. jr.
LABORIUS (http://www.gel.usherb.ca/laborius)
Université de Sherbrooke, Québec, Canada


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