1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

A New OpenCL Back-End For LLVM Is Published

Compiler

Published on 07 March 2012 07:55 AM EST
Written by Michael Larabel in Compiler
4 Comments

Besides the open-source AMD Radeon support for OpenCL finally taking shape, there's more good open-source OpenCL news: a newly open-sourced LLVM OpenCL back-end.

Back in August I wrote about an OpenCL, GLSL back-end for LLVM that may soon open up. The work was the result of a German student writing the LLVM OpenCL back-end as part of his university thesis. OpenCL is generated from LLVM bit-code, similar to how the Emscripten project is generating JavaScript from LLVM bit-code. This work is what's finally being opened up.

As announced to the LLVM developers, Simon Moll, the student responsible for this work, has released his OpenCL back-end and control-flow restructuring framework. The restructuring framework re-does the instructions such that they can be expressed without goto statements and switch/loops, which is needed to emit source-code for strict control-flow structured languages like OpenCL and the GL Shading Language.

Simon's OpenCL LLVM back-end has been tested against both the recent AMD and NVIDIA drivers using the vendor demos/benchmarks, and it works with few caveats.

The OpenCL back-end has been updated so that it works against the current SVN development state of LLVM 3.0/3.1, but the GLSL back-end is currently living in the LLVM 2.9 days, but with word that it will be ported later to the latest LLVM interfaces.

The code for this interesting back-end has been published on BitBucket.org.

AMD has already commented on the work by this university student. In particular, Axtor (the restructuring framework) was compared to AMD's control-flow structizer in the AMDIL LLVM back-end AMD open-sourced a few months ago. AMD said it would be nice if the efforts could be merged, but the current licensing is incompatible. Simon Moll has already responded that he's looking at possibly putting out this code under a more permissive license.

Other related reading would be An Initial Version Of LunarGLASS-LLVM For Mesa and AMD Makes Progress With LLVM For Gallium3D.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
Latest Linux Hardware Reviews
  1. Even With Re-Clocking, Nouveau Remains Behind NVIDIA's Proprietary Linux Driver
  2. The Power Consumption & Efficiency Of Open-Source GPU Drivers
  3. AMD R600g/RadeonSI Performance On Linux 3.16 With Mesa 10.3-devel
  4. Intel Pentium G3258 On Linux
Latest Linux Articles
  1. AMD Catalyst 14.6 Does Slightly Better With APITest OpenGL Tests
  2. Updated Source Engine Benchmarks On The Latest AMD/NVIDIA Linux Drivers
  3. Nouveau vs. Radeon vs. Intel Tests On Linux 3.16, Mesa 10.3-devel
  4. KVM Benchmarks On Ubuntu 14.10
Latest Linux News
  1. Fedora Assembles A Security Team
  2. AMD Launches The A10-7800, The 65 Watt Kaveri
  3. Builder: A New Development IDE Being Built For GNOME
  4. GDB 7.8 Betters Python Scripting, Adds Guile Support
  5. GNOME's GTK+ Is Still Striving For A Scene Graph, Canvas API
  6. Unreal Tournament Looks Great For Team Deathmatch
  7. LibreOffice 4.3 Released With Many Exciting Changes
  8. GNOME/GTK On Wayland Gains Focus At GUADEC
  9. GNOME Stakeholders Take Issue With Groupon Over their Gnome
  10. GStreamer VA-API Plug-In Update Adds New Features
Latest Forum Discussions
  1. Grand Theft Auto Running On Direct3D Natively On Linux Shows Gallium3D Potential
  2. AMD Publishes Open-Source Linux HSA Kernel Driver
  3. Linus Torvalds On GCC 4.9: Pure & Utter Crap
  4. Debian + radeonsi
  5. Open-source drivers on ATI R7 260X
  6. AMD Athlon 5350 APU On Linux
  7. Updated and Optimized Ubuntu Free Graphics Drivers
  8. List of Linux friendly Kickstarter projects