Not sure I completely understand what you are after, but I think most audio
folks don't use types like int, long and short, but rather types like int32_t
from types.h (or sys/types.h). There are various guarantees made about the
sizes of those types that you can look up.
Also, I assume you've given C++ templates and operator overloading
consideration.
bjorn
On May 1, 2013, at 4:35 PM, Sampo Syreeni wrote:
> For the longest time I took out a compiler and started cranking out an old
> idea. In that vein, I'm using libsndfile and its (highly reasonable)
> processing model: you just keep everything to zero padded ints (preferably
> signed) and go from there.
>
> The trouble is that my code is of the kind that also requires lots of bit
> twiddling. My current problem comes from trying to make the code more or less
> adaptive to any bit width, while I also have to do stuff like computed shifts.
>
> So, how do you go about systematically and portably implementing what you
> would expect from your logical operations, using standard C operations,
> without knowing the basic width of your types? (Logical, not arithmetic)
> right shifts of signed quantities, efficient parity, and computed shifts with
> negative offsets are proving particularly nasty at the moment. (It has to do
> with dithering at arbitrary word length which also has to be reasonably
> efficient if any set in silicon.)
> --
> Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front
> +358-50-5756111, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
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-----------------------------
Bjorn Roche
http://www.xonami.com
Audio Collaboration
http://blog.bjornroche.com
@xonamiaudio
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