[linux-audio-user] Re: [linux-audio-dev] swh plugins and fixing undenormalize

[Steve Harris]

On Thu, Jun 24, 2004 at 02:11:34AM -0300, Juan Linietsky wrote:
> #define undenormalise(sample) if(((*(unsigned int*)&sample)&0x7f800000)==0) 
> sample=0.0f
> 
> however gcc 3.3 and 3.4 seem to produce an undesired effect
> when the optimizer is turned on, rendering this macro unusable..
> this breaks freeverb and a few other stuff I have that uses it.

It violates C99's pointer aliasing rules. I've posed a C99 friendly
version later in the thread.

Another point of differentiation between denomal hacks is tht this one
doesnt even analyse the potential denomal as a float, so you miss one
denomal operation that can occur with cleaner methods.

- Steve