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• arm : vp9itxfm : Avoid reloading the idct32 coefficients

  2 janvier 2017, par Martin Storsjö

  arm : vp9itxfm : Avoid reloading the idct32 coefficients
  The idct32x32 function actually pushed q4-q7 onto the stack even
  
  though it didn’t clobber them ; there are plenty of registers that
  
  can be used to allow keeping all the idct coefficients in registers
  
  without having to reload different subsets of them at different
  
  stages in the transform.
  Since the idct16 core transform avoids clobbering q4-q7 (but clobbers
  
  q2-q3 instead, to avoid needing to back up and restore q4-q7 at all
  
  in the idct16 function), and the lanewise vmul needs a register in
  
  the q0-q3 range, we move the stored coefficients from q2-q3 into q4-q5
  
  while doing idct16.
  While keeping these coefficients in registers, we still can skip pushing
  
  q7.
  Before :                              Cortex A7       A8       A9      A53
  
  vp9_inv_dct_dct_32x32_sub32_add_neon :  18553.8  17182.7  14303.3  12089.7
  
  After :
  
  vp9_inv_dct_dct_32x32_sub32_add_neon :  18470.3  16717.7  14173.6  11860.8
  This is cherrypicked from libav commit
  
  402546a17233a8815307df9e14ff88cd70424537.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/arm/vp9itxfm_neon.S

• swscale/rgb2rgb : remove R-V V shuffle_bytes_3012

  29 septembre 2023, par Rémi Denis-Courmont

  swscale/rgb2rgb : remove R-V V shuffle_bytes_3012
  This is slower than the Zbb version on real hardware due to register
  
  strides. Proper support for vector byte-swap requires the Zvbb
  
  extension, but it's much too early for me to worry about it.
  

  • [DH] libswscale/riscv/rgb2rgb.c
  • [DH] libswscale/riscv/rgb2rgb_rvv.S

• Official Piwik Training in Berlin – 2014, June 6th

  6 mai 2014, par Piwik Core Team — Community

  This event will focus on providing training to users of the Piwik analytics platform. The training will provide attendees with the necessary skills and knowledge that they will need to be able to take their website to the next level with Piwik.

  Language : English

  Register to Piwik Training now.

  Location : The 25hours Hotel Bikini Berlin is as diverse as the big city it is located in and as wild as a jungle. The hotel showcases cosmopolitan Berlin at its location in the listed Bikini-Haus building between the Tiergarten park and Breitscheidplatz with Kaiser Wilhelm Memorial Church.

  

  Why do you need training ?

  If you have just started using Piwik and are finding it a bit overwhelming, this training event will benefit you immensely. You will be able to learn all the necessary skills that will allow you move forward with Piwik.

  For users who have been using Piwik for a short time and have a bit of experience in using Piwik, you will be able to learn how to advance your skills and extend your knowledge of the Piwik platform.

  Advanced users will be able to gain more knowledge about the complex features and functions that Piwik incorporates, allowing you to customise different areas of the platform and learn about advanced topics.

  How can you benefit from this training event ?

  By understanding how Piwik works and how to use and operate Piwik more effectively, you will be able to make sound changes to your website that will allow you to achieve your business goals.

  Everyone, from ecommerce businesses to government organisations can benefit from this training event and learn the essential skills and gain the relevant knowledge to meet their goals and requirements.

  Some of the skills that you will learn during the training include :

  • How to install and get started with the Piwik platform
  • How Piwik will add value to your website
  • How to analyse and make sense of the data and information that you collect
  • How to create custom segments that will allow you to report on certain data and information
  • Advance exercises – Piwik settings, tweaking and basic diagnostics

  What equipment do I need in order to participate in the event ?

  You will need a computer that is able to connect to a Wifi network

  Are the tickets transferable ?

  Yes, the tickets are transferable.

  What is the refund policy on the tickets ?

  You are entitled to a refund up to 1 week before the commencement of the training.

  Training details

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  Contact us : contact@piwik.pro

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