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. 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. Radeon Graphics Yield Mixed Results With Linux 3.17 Kernel
  2. AMD's RadeonSI Driver Sped Up A Lot This Summer
  3. Intel's Latest Linux Graphics Code Competes Against OS X 10.9
  4. Intel Sandy Bridge Gets A Surprise Boost From Linux 3.17
Latest Linux News
  1. Preview Of AMD Radeon R9 290 Hawaii Open-Source Performance
  2. Intel Bay Trail Performance With Linux 3.16/3.17 & Mesa 10.3
  3. EFL Sees A Ton Of Work Following Recent v1.11 Release
  4. ARM Talks Up Wayland For Mali
  5. GNOME/GTK+ Human Interface Guidelines Updated
  6. Robocraft Is Rolling Over To Linux
  7. The Widely-Criticized New Commercial Linux Distro Is Now On Kickstarter
  8. Wayland & Weston 1.6 Alpha Released
  9. A New First-Person Mystery Game Might Be Coming To Linux
  10. Patch By Patch, LLVM Clang Gets Better At Building The Linux Kernel
Latest Forum Discussions
  1. Systemd 216 Piles On More Features, Aims For New User-Space VT
  2. Btrfs Gets Talked Up, Googler Encourages You To Try Btrfs
  3. OSS radeon driver for A10-7850K (Kaveri)
  4. Could be avoid to use flash for show the benchmark on the articles?
  5. American Citizens running AMOK for food stamps
  6. What Linux Distribution Should Be Benchmarked The Most?
  7. Company I work for is looking to contribute to Open Source projects... but wrongly?
  8. Microsoft vs. Campaign