Subject: Re: [linux-audio-dev] Denormal numbers
From: Simon Jenkins (sjenkins_AT_blueyonder.co.uk)
Date: Mon Aug 04 2003 - 01:39:35 EEST
Steve Harris wrote:
>On Sun, Aug 03, 2003 at 07:47:31 +0100, Simon Jenkins wrote:
>
>
>>Here's where I've got to so far. Comments are welcome.
>>
>>
>
>Looks fine in theory, but it forces an extra branch per MUL, which is not
>really practical.
>
Its only an extra branch on the MULs where you actually use it. I'm not
suggesting
replacing every multiplication everywhere with this, but to pinpoint
*exactly*
the MUL that might first produce a denormal (*if* that is actually a
potential
problem in an app) and replacing just one crucial multiplication with a
flushing
function, which hopefully will propogate the zero through the rest of the
calculation.
>I haven't had a chance to try your fixes to FLUSH_TO_ZERO, but I'l try
>this week.
>
They definitely fix actual problems, but I'm not at all convinced that they
fix all problems. I suspect that its still broken. If so then my
flushing multiply
functions are possibly (but not definitely) broken in the same way.
Simon Jenkins
(Bristol, UK)
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