Hello:
I did some quick benchmarks, having to do with qualifying pointers local to
gegl-sampler-yafr.c and gegl-sampler-linear.c with the restrict keyword.
The upshoot:
Speed wise, this makes not difference.
Comments:
These functions are fairly simple, so it could be that gcc can untangle
a
Hello Sven:
Given that the restrict keyword may be defined by default for other compilers
than gcc (it is in gcc
http://developer.apple.com/documentation/DeveloperTools/gcc-4.0.1/gcc/Other-Builtins.html
wouldn't the following be better?
#ifndef restrict
#ifndef G_GNUC_RESTRICT
#if defined (_
Short postscript about the benchmark:
I got worried that with a scaling factor of 20, since we recompute the exact
same piexl coefficients about 400 times, the chip's branch prediction may be
performing better than would be typical with more reasonable enlargement ratios.
So, I redid the tests
On Sat, Sep 13, 2008 at 1:49 PM, Sven Neumann <[EMAIL PROTECTED]> wrote:
> Hi,
>
> On Sat, 2008-09-13 at 08:41 -0400, Nicolas Robidoux wrote:
>
>> One thing which I would not mind seeing throughout the gegl code is the
>> systematic use of the const keyword.
>
> We will happily accept patches that
Hi,
On Sat, 2008-09-13 at 08:41 -0400, Nicolas Robidoux wrote:
> One thing which I would not mind seeing throughout the gegl code is the
> systematic use of the const keyword.
We will happily accept patches that introduce more constness. Pippin, do
you agree?
Sven
__
(Forgive me for preaching, done from the vantage point of a very stubby
soapbox.)
One thing which I would not mind seeing throughout the gegl code is the
systematic use of the const keyword.
My understanding is that the const keyword can also be used effectively to
indicate to the compiler th
Hi,
I've filed an enhancement request for G_GNUC_RESTRICT:
http://bugzilla.gnome.org/show_bug.cgi?id=552098
We should however not wait for this to be included in GLib. As GLib 2.18
has just been released, it will take a while before 2.20 hits the road.
Sven
_
Hi,
On Sat, 2008-09-13 at 09:37 +0200, Sven Neumann wrote:
> It looks like the restrict keyword could be easily wrapped into a macro
The following code seems to do the trick. It introduces G_GNUC_RESTRICT,
which is actually in the GLib namespace. But I hope that we can convince
the GLib develope
Hi,
regarding the use of C99 features, this is a pointer to the last time
this question came up among the GLib developers:
http://mail.gnome.org/archives/gtk-devel-list/2008-June/msg00020.html
The thread linked from this mail might have some interesting arguments
that we should consider.
Sven
Hi,
On Fri, 2008-09-12 at 19:45 -0400, Nicolas Robidoux wrote:
> There is another C99/gcc built-in with the potential to speed up code a lot:
> the restrict keyword.
>
> See:
>
> http://www.cellperformance.com/mike_acton/2006/05/demystifying_the_restrict_keyw.html
It looks like the restrict k
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