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 Benchmarking Platform
Phoromatic Test Orchestration

Intel Makes Microsoft's C++ AMP Cross-Platform

Compiler

Published on 16 November 2012 06:29 AM EST
Written by Michael Larabel in Compiler
10 Comments

Microsoft conceived C++ Accelerated Massive Parallelism (AMP) as a library atop DirectX 11 for offering data-parallelism directly in C++ that can make easy use of GPUs while having CPU fall-back support. With C++ AMP being similar to OpenCL, Intel engineers decided to implement the Microsoft specification within OpenCL and using LLVM/Clang so that it can be used cross-platform.

Microsoft considers C++ Accelerated Massive Parallelism to be one of their open specifications (it's under their "Community Promise" license), but with being implemented atop DirectX 11 and the compiler support being only built into Microsoft Visual Studio 2012, it isn't widely available outside of Microsoft's scope.

Engineers at Intel ended up developing "Shevlin Park", which is a prototype implementation of C++ AMP built using OpenCL with LLVM/Clang. The LLVM/Clang compiler stack was modified to handle C++ AMP programming constructions and the C++ AMP computations expressed within OpenCL compute kernels.

The C++ AMP run-time library was also implemented on an OpenCL run-time. Being implemented in this manner, C++ AMP can now be used within non-Microsoft/Windows environments. This Intel implementation with LLVM works on both the GPU and CPU.

The Shevlin Park project was talked about earlier this month at the LLVM Developers' Meeting in San Jose, California. The Intel slides covering Shevlin Park can be found here (PDF).

As far as why someone would want to try C++ AMP rather than just using OpenCL or other GPGPU models, Intel's Dillon Sharlet describes the Microsoft interface as an "elegant, minimal C++ extensions and template libraries for data parallel programming." C++ AMP has the host and device code in the same programming language while concealing any driver APIs. Meanwhile, the data programming parallel model is very close to that of OpenCL and is similar to that of the NVIDIA CUDA run-time API.

Benchmarks by Intel show that their Shevlin Park implementation of C++ AMP can actually outperform that of the C++ AMP support within Visual Studio 2012. In some cases, using raw OpenCL is faster than both Accelerated Massive Parallelism versions.

The Shevlin Park work is still considered experimental but the slides are definitely worth checking out for anyone interested in low-level code/compiler work.

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. Trying Out The Modern Linux Desktops With 4 Monitors + AMD/NVIDIA Graphics
  2. Turning A Basement Into A Big Linux Server Room
  3. NVIDIA's $1000+ GeForce GTX TITAN X Delivers Maximum Linux Performance
  4. OS X 10.10 vs. Ubuntu 15.04 vs. Fedora 21 Tests: Linux Sweeps The Board
  5. The New Place Where Linux Code Is Constantly Being Benchmarked
  6. 18-GPU NVIDIA/AMD Linux Comparison Of BioShock: Infinite
Latest Linux News
  1. Firefox 37 Coming Today With Heartbeat, HTTPS Bing
  2. OpenIndiana 2015.03 Updates Its Solaris/Illumos Environment
  3. GNOME 3.16 SDK Runtime Now Available
  4. Initial Intel Braxton Support Might Come To Linux 4.1
  5. Why KDE's KWin Doesn't Integrate Weston/QtCompositor For Wayland Support
  6. Clang Now Supports Targeting The NaCl OS
  7. PC-BSD Updates Its Lumina Desktop (v0.8.3)
  8. Fedora 22 Alpha Now Available For AArch64 & PowerPC64
  9. Systemd Developers Did NOT Fork The Linux Kernel
  10. PulseAudio 7.0 To Enable LFE Remixing By Default
Most Viewed News This Week
  1. Introducing The Library Operating System For Linux
  2. Improved OpenCL Support For Blender's Cycles Renderer
  3. Allwinner Continues Jerking Around The Open-Source Community
  4. Open-Source Driver Fans Will Love NVIDIA's New OpenGL Demo
  5. GNOME 3.16 Released: It's Their Best Release Yet
  6. Systemd Change Allows For Stateless Systems With Tmpfs
  7. Ubuntu 15.04 Final Beta Released
  8. Nuclide: Facebook's New Unified IDE