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

64-bit ARM (AArch64) Support Merged Into LLVM

Compiler

Published on 31 January 2013 10:30 AM EST
Written by Michael Larabel in Compiler
Comment On This Article

GCC has had support for 64-bit ARM, a.k.a. AArch64, going back to last summer for using the open-source compiler with next-generation ARMv8 hardware. Being merged today is finally support for the LLVM compiler infrastructure with an experimental 64-bit ARM/AArch64 back-end target.

Adding fourty-five thousand lines of new code to the LLVM tree is a patch that adds support for ARM's 64-bit architecture to LLVM. This target is currently experimental and not built by default, but requires a compile-time switch for enabling. However, there's already talk amongst developers about enabling 64-bit ARM support by default. This work was merged into mainline LLVM this morning and will thus be found in the LLVM 3.3 release due out in a couple months time.

This initial AArch64 LLVM compiler support covers Assembly for all scalar instructions except for the late addition CRC instructions, code generation features needed for C++0x and C99, compilation support for the small memory model, absolute and position-independent code support, GNU-style TLS, and debugging support.

The 64-bit ARM compiler support, however, has yet to undergo any performance tuning for the greatest compiler performance. With there still being a few months to go until LLVM 3.3 is released, this will likely be achieved before the AArch64 LLVM support is in any released version.

Another limitation is that there isn't any NEON support for the AArch64 experimental target because the developer says there was "an outbreak of batshit insanisty in [ARM's] legal department."

The initial AArch64/ARMv8 instruction set support for LLVM can be found by cloning the LLVM SVN/Git repository where this big patch landed today.

LLVM 3.3 should be a fantastic release since aside from the 64-bit ARM support will also be the AMD Radeon GPU back-end, likely the enabling by default of the new loop vectorizer, and many other features for this open-source compiler infrastructure.

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. Intel Launches The Core i7 5960X, Mighty Powerful Haswell-E CPUs
  2. AMD Radeon R9 290: Gallium3D vs. Catalyst Drivers
  3. AMD Radeon R9 290 Open-Source Driver Works, But Has A Ways To Go
  4. Trying The Configurable 45 Watt TDP With AMD's A10-7800 / A6-7400K
Latest Linux Articles
  1. Testing For The Latest Linux Kernel Power Regression
  2. The Most Energy Efficient Radeon GPU For AMD Linux Gaming
  3. 20-Way Radeon Comparison With Open-Source Graphics For Steam On Linux Gaming
  4. Preview: OS X 10.10 Yosemite vs. Ubuntu Linux GPU Performance
Latest Linux News
  1. LibreOffice Ported To 64-bit ARM (AArch64)
  2. Enlightenment E19 RC3 Shows Off The New Wayland Compositor
  3. Metro Redux Is Going To Require OpenGL 4.x On Linux
  4. Jailhouse v0.1 Released As A Basic Hypervisor For Linux
  5. Google's Chromebook "Samus" Now Supported By Coreboot
  6. Chrome 38 Now In Beta With Exciting Advancements
  7. Ubuntu's Utopic Unicorn 14.10 Beta 1 Released
  8. Genode OS 14.08 Has New GUI Architecture, Pluggable VFS
  9. Another Intel Linux Power Regression Is Being Investigated
  10. DNF Makes It A Step Closer To Replacing Yum On Fedora
Latest Forum Discussions
  1. Updated and Optimized Ubuntu Free Graphics Drivers
  2. Canonical Joined The Khronos Group To Help Mir/Wayland Drivers
  3. Users defect to Linux as OpenBSD removes Lynx from base system
  4. Radeon HD5670 and Ubuntu 14.04
  5. AMD Releases UVD Video Decode Support For R600 GPUs
  6. Best Radeon for a Power Mac G5?
  7. OC capability - Intel Core i5 4690K & Biostar Hi-Fi Z97WE
  8. Announcing radeontop, a tool for viewing the GPU usage