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. 13-Way Low-End GPU Comparison With AMD's AM1 Athlon
  2. ASUS AM1I-A: A Mini-ITX Board For Socketed Kabini APUs
  3. Mini-Box M350: A Simple, Affordable Mini-ITX Case
  4. Overclocking The AMD AM1 Athlon & Sempron APUs
Latest Linux Articles
  1. Ubuntu 12.04.4 vs. 13.10 vs. 14.04 LTS Desktop Benchmarks
  2. AMD OpenCL Performance With AM1 Kabini APUs
  3. A Quick Look At GCC 4.9 vs. LLVM Clang 3.5
  4. Are AMD Athlon/Sempron APUs Fast Enough For Steam On Linux?
Latest Linux News
  1. Borderlands Is Being Considered For Linux
  2. Mesa 10.0 & 10.1 Stable Get Updated
  3. Getting Hit By The Variable Performance Of The Public Cloud
  4. Git 2.0 Test Releases Begin With Many Changes
  5. Wine 1.7.17 Works On Its Task Scheduler, C Run-Time
  6. The Improv ARM Board Still Isn't Shipping; Riding A Dead Horse?
  7. Debian To Maintain 6.0 Squeeze As An LTS Release
  8. Wasteland 2 Is Finally Released For Linux Gamers
  9. FreeBSD Advances For ARM, Bhyve, Clang
  10. Ubuntu 14.04 LTS "Trusty Tahr" Officially Released
  11. Ubuntu 12.04 LTS vs. 14.04 LTS Server Benchmarks
  12. QEMU 2.0 Released With ARM, x86 Enhancements
Latest Forum Discussions
  1. Suggestions about how to make a Radeon HD 7790 work decently?
  2. The GNOME Foundation Is Running Short On Money
  3. Updated and Optimized Ubuntu Free Graphics Drivers
  4. Radeon 8000M problematic on Linux?
  5. Linux Kernel Developers Fed Up With Ridiculous Bugs In Systemd
  6. After Jack Keane, RuseSoft will briing Ankh 3 to Linux through Desura
  7. Suspected PHP Proxy Issue
  8. Change installation destination from home directory