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
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
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