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

Intel Is Nearing OpenMP Support In LLVM/Clang

Compiler

Published on 06 May 2013 07:51 PM EDT
Written by Michael Larabel in Compiler
7 Comments

At the recent European LLVM meeting in Paris, Andrey Bokhanko and Alexey Bataev of Intel covered their work on supporting OpenMP within LLVM.

LLVM's lack of OpenMP support for multi-processing is what's made the Clang compiler not too suitable at the moment for some multi-threaded benchmarks, as Phoronix tests so frequently show. For years now there's been efforts to support OpenMP in LLVM/Clang, but nothing that's yet been merged to mainline.

In 2012, work on OpenMP in LLVM heated up but still with the forthcoming LLVM 3.3 release there is not full support for Open Multi-Processing.

In the Intel OpenMP LLVM presentation from France, the state and current work was covered. The slides can be found here (PDF slides).

Intel's efforts build upon earlier work done by AMD in supporting OpenMP and the Clang compiler can generate OpenMP RTL calls without changes to the LLVM IR. The GCC compiler uses libgomp as its OpenMP library but with that being GPLv3 and is incompatible with LLVM's more permissive BSD-style license, Intel stepped up to the place. Released in April was the Intel OpenMP runtime that is under a three-clause BSD license. Intel's OpenMP runtime that they put out under the BSD license is their production runtime used by the ICC compiler and Ifort. This Intel OpenMP runtime has been in development since before OpenMP was officially conceived and has proven to be highly-scalable.

What's been implemented and committed so far when it comes to the LLVM/Clang OpenMP support is handling the -fopenmp compiler switch, supporting the #pragma omp threadprimitive, and parsing and semantic analysis with AST representation. There's code currently under review for supporting all OpenMP pragmas while still under development is code generation support for OpenMP constructs.

While no time-line was shared in regards to mainline OpenMP LLVM/Clang support, hopefully with the current pace of activity, that there will be some functioning support prior to year's end.

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. Trying The Configurable 45 Watt TDP With AMD's A10-7800 / A6-7400K
  2. Sumo's Omni Gets Reloaded
  3. AMD A10-7800 & A6-7400K APUs Run Great On Linux
  4. Radeon Gallium3D Is Running Increasingly Well Against AMD's Catalyst Driver
Latest Linux Articles
  1. CPUFreq Scaling Tests With AMD's Kaveri On Linux 3.16
  2. Enabling HyperZ Is Still An Easy Way For Faster RadeonSI Performance
  3. AMD Kaveri: Catalyst vs. RadeonSI Gallium3D On Linux
  4. Linux OpenCL Performance With The Newest AMD & NVIDIA Drivers
Latest Linux News
  1. Proposed: A Tainted Performance State For The Linux Kernel
  2. Systemd 216 Piles On More Features, Aims For New User-Space VT
  3. Mesa 10.2.6 Has Plenty Of OpenGL Driver Bug Fixes
  4. Wasteland 2 Gets An Official Release Date
  5. Dead Island For Linux Appears Imminent
  6. LXQt 0.8 Is Being Released Soon
  7. Linux 3.17 Lands Memfd, A KDBUS Prerequisite
  8. Humble Jumbo Bundle 2 Shafts Linux Gamers
  9. Ubuntu 14.10's Feature Freeze Is This Wednesday
  10. New VM Software Claims To Be 4.5x Faster Than QEMU
Latest Forum Discussions
  1. Remote gui not accessible in Phoronix Test Suite 5.2
  2. The dangers of Linux kernel development
  3. Dead Island for Linux (?)
  4. Updated and Optimized Ubuntu Free Graphics Drivers
  5. AMD Offers Mantle For OpenGL-Next, Pushes Mantle To Workstations
  6. Next-Gen OpenGL To Be Announced Next Month
  7. OpenGL 4.5 Released With New Features
  8. Updated graphics drivers for Ubuntu 12.04 Precise LTS