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

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Subject: Re: [linux-audio-dev] swh plugins and fixing undenormalize
From: Simon Jenkins (sjenkins_AT_blueyonder.co.uk)
Date: Fri Jun 25 2004 - 02:45:34 EEST

Steve Harris wrote:

>On Thu, Jun 24, 2004 at 01:10:37 -0300, Juan Linietsky wrote:
>
>
>>>>>inline float FlushToZero( volatile float f )
>>>>>{
>>>>> f += 9.8607615E-32f;
>>>>> return f - 9.8607615E-32f;
>>>>>}
>>>>>
>>>>>
>>That actually looks nice... since thanks to writing "volatile float f",
>>the optimizer should not touch it.. it' the same thing than
>>when one accsses directly to the harware using pointers
>>to memmaped registers.. lack of using "volatile" often
>>ends up in non-working code..
>>
>>
>
>Ah, yes, I guess volatile should mean that. Hmmm...
>
The reason its an inline function rather than a drop-in replacement
macro is because casting macro arguments to volatile wasn't having
the desired effect on the optimiser, whereas this does.

Simon Jenkins
(Bristol, UK)

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