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

OpenMP Support For LLVM/Clang Still Being Drawn

Compiler

Published on 27 December 2012 08:27 AM EST
Written by Michael Larabel in Compiler
4 Comments

One of the features sadly not found in the recent release of LLVM/Clang 3.2 is OpenMP support.

While OpenMP is a very common cross-platform parallel programming interface and its usage is very common to open-source projects with works spanning from desktop applications to super-computer workloads, OpenMP support in LLVM/Clang has been notably missing. There's been OpenMP patches before, talk of how to best represent OpenMP in LLVM, and other attempts, but nothing that's fully materialized within mainline for handling this industry-standard for parallel programming.

This past January it looked like OpenMP was finally coming to LLVM/Clang, LLVM was getting close to handling OpenMP, and then some out-of-tree patches were floating around. Sadly though with OpenMP being around for the past decade there still isn't this support. The roadblocks up to this point with earlier work have been about LLVM IR changes for handling OpenMP that are complex and could lead to other messy changes.

Fortunately, the OpenMP LLVM/Clang discussion has been reignited. Intel's Compiler Team this week sent in an RFC about OpenMP support in Clang. A couple Intel compiler engineers submitted a proposal for comments about the general design description for OpenMP constructs representation within LLVM's AST (Abstract Syntax Tree). "We seek feedback on the proposed design and ways to improve it." This document only covers handling OpenMP within the Abstract Syntax Tree but not the run-time library, ABI, or other design areas.

Hopefully with Intel investing in LLVM OpenMP now we'll see some real progress soon. The proposal and other information can be found from the Clang mailing list. Another parallel programming standard that isn't widely loved by open-source compilers is OpenACC.

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 Articles & Reviews
  1. Intel Broadwell: GCC 4.9 vs. LLVM Clang 3.5 Compiler Benchmarks
  2. Ubuntu vs. Fedora Linux On Lenovo's X1 Carbon With Core i7 Broadwell
  3. Ubuntu 15.04 Is The Easy Path To Better Performance On Intel Broadwell
  4. NVIDIA's Latest Maxwell Line-Up Against AMD With Catalyst On Linux
  5. Preliminary Tests Of Intel Sandy Bridge & Ivy Bridge vs. Broadwell
  6. AMD FX-8320E Performance On Linux
Latest Linux News
  1. I Switched (Back) Over To Fedora As My Main OS & It's Going Great!
  2. Windows 10, PS4, C4 & Systemd News Kicked Off 2015
  3. Calamares 1.0 Distribution-Independent Installer Framework Released
  4. Librem 15 Linux Laptop Set To Close At Around $400k USD
  5. Virtual GEM To Increase Mesa's Software Rasterizer Performance
  6. Open Lunchbox: Yet Another Open-Source Laptop Attempt
  7. Wayland/Weston 1.7 Release Candidate
  8. Bugzilla 5.0 Is Coming Soon With New Features
  9. Linux Benchmarking... Even Faster & A Very Interesting February
  10. Does VirtualBox VM Have Much A Future Left?
Most Viewed News This Week
  1. PlayStation 4 System Compiler Support Landing In LLVM
  2. Does VirtualBox VM Have Much A Future Left?
  3. Linux "GHOST" Vulnerability Hits Glibc Systems
  4. LibreOffice 4.4 Is Coming Soon With New Features
  5. LLVM Adds Options To Do Fuzz Testing
  6. Broadwell Linux Ultrabook Running MUCH Cooler Than Haswell
  7. LibreOffice 4.4 Released With Better OOXML Support, UI Improvements
  8. Inkscape 0.91 Goes Through C++ Code Conversion, New Cairo Rendering, OpenMP Filters