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

AMD Radeon R600 GPU LLVM 3.3 Back-End Testing

Michael Larabel

Published on 14 May 2013
Written by Michael Larabel
Page 1 of 3 - 23 Comments

One of the exciting features of LLVM 3.3 that is due out next month is the final integration of the AMD R600 GPU LLVM back-end. This LLVM back-end is needed for supporting Gallium3D OpenCL on AMD Radeon graphics hardware, "RadeonSI" HD 7000/8000 series support, and can optionally be used as the Radeon Gallium3D driver's shader compiler. In this article are some benchmarks of the AMD R600 GPU LLVM back-end from LLVM 3.3-rc1 when using several different AMD Radeon HD graphics cards and seeing how the LLVM compiler back-end affects the OpenGL graphics performance.

This R600 GPU LLVM back-end has been a big focus of AMD going back to last year. Tom Stellard of AMD has been principally responsible for its development as he's been tackling the open-source OpenCL driver support, but there have also been numerous contributions by other open-source developers. This GPU back-end for LLVM originally lived within the Mesa repository but was finally merged into LLVM for the 3.3 release. Given the approximate six-month release cycle, this back-end still isn't widely depended upon yet but is an optional feature for those wanting to use this shader compiler instead, wanting to experiment with Radeon OpenCL support, or are after RadeonSI support.

Aside from needing to build LLVM 3.3 with the R600 experimental target, Mesa also needs to be built using the --enable-r600-llvm-compiler flag. While a build-time switch, the LLVM compiler back-end can then be manually toggled at run-time via the R600_LLVM environment variable.

When this week trying out the latest Mesa Git in conjunction with LLVM 3.3-rc1, the LLVM back-end is working a heck of a lot better than it has in months prior. There's no longer any rendering problems or other issues as was the case when it was much earlier in development. Overall, it's working great.

For seeing how this R600 LLVM back-end impacts end-users, Linux OpenGL benchmarks were conducted with several different GPUs to see the affect on performance. The tested graphics cards on the "R600g" Gallium3D driver were the Radeon HD 4550, HD 4870, HD 5830, and HD 6770. When it comes to the compiler performance, it's obviously not the full story by just showing the Linux gaming frame-rate when the compiler time, usage, and other factors play into the back-end story, but it provides a glimpse at what end-users and enthusiasts can expect from this R600 LLVM GPU back-end. All benchmarking was handled via the open-source and cross-platform Phoronix Test Suite benchmarking software.

<< Previous Page
1
Latest Linux Hardware Reviews
  1. MSI X99S SLI PLUS On Linux
  2. NVIDIA GeForce GTX 970 Offers Great Linux Performance
  3. CompuLab Intense-PC2: An Excellent, Fanless, Mini PC Powered By Intel's i7 Haswell
  4. From The Atom 330 To Haswell ULT: Intel Linux Performance Benchmarks
Latest Linux Articles
  1. Open-Source Radeon 2D Performance Is Better With Ubuntu 14.10
  2. RunAbove: A POWER8 Compute Cloud With Offerings Up To 176 Threads
  3. 6-Way Ubuntu 14.10 Linux Desktop Benchmarks
  4. Ubuntu 14.10 XMir System Compositor Benchmarks
Latest Linux News
  1. Fedora 21 Beta & Final Release Slip Further
  2. Mesa 10.3.2 Has A Couple Bug-Fixes
  3. RadeonSI/R600g HyperZ Support Gets Turned Back On
  4. openSUSE Factory & Tumbleweed Are Merging
  5. More Fedora Delays: Fedora 21 Beta Slips
  6. Mono Brings C# To The Unreal Engine 4
  7. Coreboot Now Has Support For Intel Broadwell Hardware
  8. Enlightenment's EFL 1.12 Alpha Has Evas GL-DRM Engine, OpenGL ES 1.1 Support
  9. GTK+ Lands Experimental Backend For Mir Display Server
  10. Ubuntu 14.10 Officially Released
Latest Forum Discussions
  1. AMD Radeon VDPAU Video Performance With Gallium3D
  2. HOPE: The Ease Of Python With The Speed Of C++
  3. Updated and Optimized Ubuntu Free Graphics Drivers
  4. Ubuntu 16.04 Might Be The Distribution's Last 32-Bit Release
  5. Linux hacker compares Solaris kernel code:
  6. Advertisements On Phoronix
  7. Users/Developers Threatening Fork Of Debian GNU/Linux
  8. AMD Releases UVD Video Decode Support For R600 GPUs