On Mon, Oct 15, 2012 at 9:35 AM, Gabor Rapcsanyi rga...@inf.u-szeged.huwrote:
On 10/12/2012 11:23 AM, Tom Hudson wrote:
Do you have particular bottleneck functions that you have reason to
believe would benefit from ARM SIMD optimizations? Under what
workloads, and how much benefit?
We've
Yes I agree that we need to do some measures to see the benefits of floats.
But it's not just about the performance and memory gain of the floats, I
would like to make ARM SIMD optimizations for the transformation
functions to fasten up them, but ARM NEON technology only works with
floats
on all the platforms.
Don
-Original Message-
From: webkit-dev-boun...@lists.webkit.org
[mailto:webkit-dev-boun...@lists.webkit.org] On Behalf Of Simon Fraser
Sent: Monday, May 21, 2012 10:35 AM
To: Zoltan Herczeg
Cc: webkit-dev@lists.webkit.org
Subject: Re: [webkit-dev] Transformations
Hi, I have the same questions. Using float, It's easier to map to
OGLES2, Decrease memory usage and accelerated using ARM SIMD.
if you do profiling for CSS transformation/Animation, you'll find
TransformationMatrix hotspots that should be well optimized using
NEON.
-Kuii
On Mon, May 21, 2012
: webkit-dev-boun...@lists.webkit.org
[mailto:webkit-dev-boun...@lists.webkit.org] On Behalf Of kui zheng
Sent: 22 May 2012 14:04
To: Stephen Chenney
Cc: webkit-dev@lists.webkit.org
Subject: Re: [webkit-dev] Transformations precision: double - float
Hi, I have the same questions. Using float, It's
, 2012 10:35 AM
To: Zoltan Herczeg
Cc: webkit-dev@lists.webkit.org
Subject: Re: [webkit-dev] Transformations precision: double - float
TransformationMatrix started out as floats, then got changed to doubles in
http://trac.webkit.org/changeset/40761
This was done because on most hardware
Hi,
is there any reason why the transformations in WebKit use doubles? We
could optimize some functions further with ARM SIMD if they would be
floats. Is there any objection to make them float if the change would have
no other side effects except some rounding because of the lower precision?
TransformationMatrix started out as floats, then got changed to doubles in
http://trac.webkit.org/changeset/40761
This was done because on most hardware there is no penalty for using doubles
over floats, and provided a better match with our system APIs that used doubles.
I'd prefer to take a
Maybe you can add a typedef in Platform.h to make it configurable? e.g.
maybe you want to be able to use long double instead of regular double in
the future.
- Ryosuke
On Mon, May 21, 2012 at 10:34 AM, Simon Fraser simon.fra...@apple.comwrote:
TransformationMatrix started out as floats, then
Ideally WebKit would avoid casts by consistently using either double or
floats everywhere a floating point representation is needed. I don't think
it's as simple as adding a typedef, but maybe it is. In any event it would
have to be spelled out in the style guide.
My gut feeling is that floats
10 matches
Mail list logo
