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

LLVM 3.1 Will Enhance AVX & Bring AVX2 Support

Compiler

Published on 26 December 2011 08:01 AM EST
Written by Michael Larabel in Compiler
Comment On This Article

While LLVM 3.0 has been barely out for one month and a release schedule for LLVM 3.1 hasn't even been plotted yet, there are already some new details about what this next release of the extremely popular open-source compiler infrastructure will offer.

In particular, LLVM 3.1 is poised to offer bug-fixes and overall improved support for Advanced Vector Extensions. AVX is the x86 instruction set extension that first appeared with Intel Sandy Bridge processors in early 2011 and then made their way to the AMD side with the Bulldozer launch.

GCC 4.6 offered AVX support that worked with the Sandy Bridge CPUs, but on the LLVM side they weren't as quick to adopt support for this new instruction set. As mentioned before. "Key points of the AVX ISA is expecting the vector data width to 256-bits, a new SIMD instruction format, and new data manipulation and arithmetic compute primitives. Simply put, AVX is meant to be another step forward for increasing the processor's performance and efficiency."

Within LLVM 3.1, there is "bug fixes and improved support for AVX1." However, that is not all.

Also coming in LLVM 3.1 will be preliminary support for AVX2. AVX2 is the second version of the Advanced Vector Extensions that will expand most AVX integer instructions to 256-bit, support three-operand bit manipulation and multiply, Gather support, vector shifts, and other new functionality. AVX2 isn't set to appear on any hardware until 2013 when Intel brings forth the Haswell processors (the next-generation Ivy Bridge CPUs are AVX1 still), so it's good to see the LLVM crew on top of their support game this time around and the AVX2 support will hopefully mature in LLVM over the next year.

Scanning the LLVM commit logs in the past month or two does show several AVX1/AVX2 related commits. The AVX1/AVX2 work is also mentioned in the very premature LLVM release notes page that's currently tracking LLVM 3.1 development.

On the GCC side there's also been early work towards supporting the AVX2 instruction set. Preliminary patches there have been floating around since August, among other AVX-related patches.

LLVM 3.1 will be released at some point in 2012.

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. NVIDIA GeForce GTX 970 Offers Great Linux Performance
  2. CompuLab Intense-PC2: An Excellent, Fanless, Mini PC Powered By Intel's i7 Haswell
  3. From The Atom 330 To Haswell ULT: Intel Linux Performance Benchmarks
  4. AMD Radeon R9 285 Tonga Performance On Linux
Latest Linux Articles
  1. Ubuntu 14.10 XMir System Compositor Benchmarks
  2. Btrfs RAID HDD Testing On Ubuntu Linux 14.10
  3. Ubuntu 14.10 Linux 32-bit vs. 64-bit Performance
  4. AMD Moves Forward With Unified Linux Driver Strategy, New Kernel Driver
Latest Linux News
  1. Cairo-Dock 3.4 Shows A Lot Of Progress, Works Toward EGL/Wayland Support
  2. Mesa 10.4 Tentatively Planned For Early December
  3. SteamOS Update 145 Brings Compositor, Update Fixes
  4. GStreamer 2014 Conference Videos Posted: Wayland, HTML5, 3D
  5. Nouveau Now Supports DRI3 Without GLAMOR
  6. Features Of The Linux 3.18 Kernel
  7. Debian Now Defaults To Xfce On Non-x86 Desktops
  8. Phoenix Is Trying To Be An Open Version Of Apple's Swift
  9. Linux 3.19 To Have Skylake Graphics, PPGTT Enablement
  10. Ubuntu 16.04 Might Be The Distribution's Last 32-Bit Release
Latest Forum Discussions
  1. HOPE: The Ease Of Python With The Speed Of C++
  2. Users/Developers Threatening Fork Of Debian GNU/Linux
  3. Ubuntu 16.04 Might Be The Distribution's Last 32-Bit Release
  4. AMD Releases UVD Video Decode Support For R600 GPUs
  5. Proof that strlcpy is un-needed
  6. xbox one tv tuner
  7. Bye bye BSD, Hello Linux: A Sys Admin's Story
  8. Updated and Optimized Ubuntu Free Graphics Drivers