Vector performance

[Danni Coy]

awesome sauce... Incidently I got given a 48MHz arm dev board today....

On Wed, Jan 11, 2012 at 12:14 AM, Manu <turkeyman at gmail.com> wrote:

> Just thought I might share a real-life case study today. Been a lot of
> talk of SIMD stuff, some people might be interested.
>
> Working on an android product today, I noticed the matrix library was
> burning a ridiculous amount of our frame time.
> The disassembly looked like pretty normal ARM float code, so rewriting a
> couple of the key routines to use the VFPU (carefully), our key device
> moved from 19fps -> 34fps (limited at 30, we can now ship).
> GalaxyS 2 is now running at 170fps, and devices we previously considered
> un-viable can now actually get a release! .. Most devices saw around 25-45%
> speed improvement.
>
> Imagine if all vector code throughout was using the vector hardware
> nicely, and not just one or 2 key functions...
> Getting the API right (intuitively encouraging proper usage and
> disallowing inefficient operations), it'll make a big difference!
>
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