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

New GLSL To LLVM Implementation For Mesa

Mesa

Published on 12 September 2012 12:08 PM EDT
Written by Michael Larabel in Mesa
2 Comments

Vincent Lejeune has shared a new Mesa branch that he's currently soliciting for comments as it introduces a new GLSL to LLVM pass. He hopes drivers will begin to use it, including the Intel driver with their new-found LLVM compiler ambitions.

Vincent's glsl-to-llvm work is able to generate LLVM IR out of GLSL for drivers that have a LLVM back-end in mesa/Gallium3D. Right now most of the work has been toying with the R600g driver and its LLVM back-end. This conversion pass isn't doing any optimization work at this point but simply converting GLSL to LLVM, similar to the GLSL to TGSI work previously.

While the tree is now under an "RFC" state, it's not regression-free and has some work ahead before it could even be considered for merging. "So far I managed to get something like 200 regressions on 7000 passing tests in piglit, but recent changes (ie moving the interpolation logic inside backend) added 100 others regressions in current trunk, because of failing front/back face color issue I'm working on."

Lejeune ends his mailing list message with, "I'd like to request your feedback and suggestion on my work. Glsl-to-llvm does not calls any gallium function and can also be used by classic dri drivers. I don't know what is the current status of the recently announced llvm i965 compiler, I don't know if it has already its own glsl-to-llvm pass or not. If not, it would be really great if this pass was also shared by i965, as the more drivers use it, the more reliable it is."

It was shared last month in San Diego that Intel is finally looking at an LLVM compiler for their DRI driver rather than continuing to work on their own custom compiler implementation. The other Gallium3D drivers have already been after LLVM-based compiler back-ends for various reasons. There was also Mesa LunarGLASS previously as a different implementation that made Mesa use LLVM for its IR.

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. A Walkthrough Of The New 32 System Open-Source Linux Benchmarking Test Farm
  2. Habey MITX-6771: Mini-ITX Board With Quad-Core J1900 Bay Trail
  3. OCZ Vector 150 SSD On Linux
  4. Noctua i4 CPU Cooler: Great For Cooling High-End LGA-2011v3 CPUs
Latest Linux Articles
  1. AMD Kaveri: Open-Source Radeon Gallium3D vs. Catalyst 14.12 Omega Driver
  2. 12-Way AMD Catalyst 14.12 vs. NVIDIA 346 Series Linux GPU Comparison
  3. AMD Catalyst 14.12 Omega Driver Brings Mixed Results For Linux Users
  4. 6-Way Winter 2014 Linux Distribution Comparison
Latest Linux News
  1. Linux 3.19-rc1 Kernel Released Ahead Of Schedule
  2. Civilization: Beyond Earth Linux GPU/Driver Benchmarks
  3. X.Org Server 1.16.3 Released To Fix Security Issues
  4. Linux 3.19 Merge Window Closes Ahead Of Schedule
  5. MIPS R6 Architecture Now Supported By GCC
  6. LowRISC To Feature Tagged Memory & Minion Cores
  7. Intel Skylake Audio Support For Linux 3.19
  8. After 10+ Years, NetworkManager Reaches v1.0
  9. VDPAU Updated To v0.9
  10. An Open Hardware Random Number Generator Proposed
Latest Forum Discussions
  1. FPS capped on Linux (AMD fglrx drivers)
  2. Need some hand holding with upgrading xserver
  3. Are there an app using HSA ?
  4. The New SuperTuxKart Looks Better, But Can Cause GPU/Driver Problems
  5. XLennart: A Game For Systemd Haters With Nothing Better To Do
  6. Updated and Optimized Ubuntu Free Graphics Drivers
  7. Debian init discussion in Phoenix Wright format
  8. Bench specific mount point