Re: [Gumstix-users] floating point replacements

[Leon H. <leo...@ds...>]

----- Original Message ----- 
From: "Brad Midgley" <bmi...@xm...>
To: <gum...@li...>
Sent: Saturday, May 21, 2005 4:01 PM
Subject: [Gumstix-users] floating point replacements


> Hi
>
> Are there any convenient libraries or routines you guys have come across 
> for replacing heavyweight floating point (add/mult/div) with short floats 
> or rationals?
>
> The bluetooth stereo-audio codec is rife with floating point and shows 
> pretty dismal performance on xscale (using uclibc fp emulation).
>
> I started investigating the idea of using rationals but there may need to 
> be a lot of hand-tuning to normalize the ratio in just the right places...

Where I used to work, I replaced the standard IEEE floating point 
calculations used by the C compiler by ADI's old two-word FP format in a 
16-bit DSP application and got it to run much faster. It was a lot of work, 
though.

Leon