[maemo-developers] [cairo] Re: [maemo-developers] Cairo performance comparison, 770 / N800 / PXA-320

[From: Daniel Amelang]

On 1/15/07, Kalle Vahlman <kalle.vahlman at gmail.com> wrote:
> 2007/1/16, Daniel Amelang <daniel.amelang at gmail.com>:
> > On 1/13/07, Kalle Vahlman <kalle.vahlman at gmail.com> wrote:
> > > 2007/1/14, Koen Kooi <koen at dominion.kabel.utwente.nl>:
> > > > -----BEGIN PGP SIGNED MESSAGE-----
> > > > Hash: SHA1
> > > >
> > > > Siarhei Siamashka schreef:
> > > > > On Saturday 13 January 2007 21:00, Kalle Vahlman wrote:
> > > >
> > > > > As for optimizing code for ARM (targeting Nokia 770), there are a few things
> > > > > that are slow (maybe this list is still incomplete):
> > > > > 1. Floating point math is slow without vfp (cairo contains a lot of fp math)
> > > >
> > > > Actually not very much if you build it with --disable-some-floatingpoint
> > >
> > > I didn't (had forgot about the whole flag :), but will do (should be
> > > interesting).
> >
> > That flag doesn't do anything yet, so it shouldn't be interesting :)
>
> So does grep tell me :)
>
> I guess all the improvements I thought were under that flag were in
> fact general improvements... Which is better, I guess.

That's right. We haven't yet made an improvement for FPU-less
platforms that resulted in a perceptible loss on others. The time may
come, though, so the flag remains.

Dan