Dear Tom,
With respect to your nice investigation report on Libjpeg-turbo Vs Libjpeg8c, I
have a query on Libjpeg8c's tjbench
https://wiki.linaro.org/TomGall/LibJpeg8
When i took the Libjpeg8c source code from the Libjpeg community, I did not
find the tjbench support in the libjpeg8c packag
Here's one way that NEON could be employed to accelerate Huffman
decoding. The most common 32 symbols typically account for over 99%
of Huffman codes in a JPEG image, and are typically encoded with
codons of length 2-10 bits. Four 128-bit registers can hold these 32
codons as left-justified 16-bi
On 27 October 2011 12:38, Matthias Klose wrote:
> I doubt that Ubuntu will reconsider this for Precise, but I see that you did
> schedule a session for UDS/Connect [1]. It would be good, if you could provide
> relevant information for the session:
>
> - performance data from your wiki in a precis
On 10/27/11 2:30 PM, Siarhei Siamashka wrote:
> Also huffman decoder optimizations (which are C code, not SIMD) in
> libjpeg-turbo seem to be providing only some barely measurable
> improvement on ARM, while huffman speedup is clearly more impressive
> on x86. This gives libjpeg-turbo more points o
> I have spent much time investigating
> that as well, and I couldn't manage to find a method that didn't require
> moving data back and forth between the SIMD registers and the regular
> registers (because you can't branch when using SIMD instructions, and
> branching is somewhat critical to the H
On 27/10/11 21:45, Christian Robottom Reis wrote:
> Again, wow, thanks for such a thorough analysis. I think this is indeed
> very good material for discusing with Ubuntu. Do we have a session
> scheduled with them to talk about this?
Hi folks
there is a session created:
https://blueprints.launch
On Thu, Oct 27, 2011 at 1:45 PM, Christian Robottom Reis
wrote:
> On Wed, Oct 26, 2011 at 03:54:52PM -0500, Tom Gall wrote:
>> Hardware used includes the imx53 QuickStart board by freescale and an
>> intel core 2 duo in my Lenovo T400.
>>
>> The results can be found here including both the raw num
On Thu, Oct 27, 2011 at 10:30:14PM +0300, Siarhei Siamashka wrote:
> On Thu, Oct 27, 2011 at 9:45 PM, Christian Robottom Reis
> wrote:
> > On Wed, Oct 26, 2011 at 03:54:52PM -0500, Tom Gall wrote:
> >> Hardware used includes the imx53 QuickStart board by freescale and an
> >> intel core 2 duo in m
On Thu, Oct 27, 2011 at 9:45 PM, Christian Robottom Reis
wrote:
> On Wed, Oct 26, 2011 at 03:54:52PM -0500, Tom Gall wrote:
>> Hardware used includes the imx53 QuickStart board by freescale and an
>> intel core 2 duo in my Lenovo T400.
>>
>> The results can be found here including both the raw num
On Wed, Oct 26, 2011 at 03:54:52PM -0500, Tom Gall wrote:
> Hardware used includes the imx53 QuickStart board by freescale and an
> intel core 2 duo in my Lenovo T400.
>
> The results can be found here including both the raw numbers and pretty
> graphs.
>
> https://wiki.linaro.org/TomGall/LibJpe
On 10/26/2011 10:54 PM, Tom Gall wrote:
> In prep for Linaro Connect & the Ubuntu Developers Summit next week
> I've put together some performance measurements comparing libjpeg8c
> and libjpeg-turbo compiled with it's libjpeg8 compatibility setting.
> Quality settings of 95 and 75 are used. Image
In prep for Linaro Connect & the Ubuntu Developers Summit next week
I've put together some performance measurements comparing libjpeg8c
and libjpeg-turbo compiled with it's libjpeg8 compatibility setting.
Quality settings of 95 and 75 are used. Image sizes used are 640x480
and 3136x2352.
Hardware
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