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

GCC Prepares Compiler Support For Intel Broadwell

Compiler

Published on 26 February 2013 07:43 PM EST
Written by Michael Larabel in Compiler
Comment On This Article

While Intel Haswell processors won't even be released to the public until later this year, compiler developers have already been working on supporting the new instruction set extensions of Haswell for more than one year. GCC developers already have early Intel Broadwell support ready for GCC 4.8.

One of the many features that will be part of the GNU Compiler Collection 4.8 release when it happens in the next month or two is initial Intel Broadwell support. Haswell support was already found in GCC 4.7 and improvements in 4.8, so in months prior these free software developers have already been hitting a large chunk of the Broadwell additions. Broadwell is the 14nm die shrink of Haswell due out likely in mid-2014. Broadwell is notable in that it moves to a Multi-Chip Package design, but as it concerns compiler developers, there are new instructions to support.

The hardware instructions that are now supported in GCC 4.8 for Intel Broadwell include:

RDSEED - GCC already supports RDRAND (a.k.a. "Bull Mountain") of Ivy Bridge / Haswell while Broadwell brings RDSEED. RDSEED is for generating 16/32/64-bit random numbers in accordance with the NIST SP 800-90B and 800-90C standards.
ADCX/ADOX - ADCX and ADOX are new arbitrary precision integer operations with the difference between the two instructions being how the integers are added.
PREFETCHW - Intel's PREFETCHW instruction is similar to AMD's pre-fetch handling.

These new ISA extensions are exposed in GCC via the -madx, -mprfchw, -mrdseed compiler switches.

While not part of the Broadwell enablement, GCC 4.8 for Intel also supports Intel RTM and HLE intrinsics. HLE is the Hardware Lock Elisions and RTM is for Restricted Transactional Memory. These new supported Intel intrinsics are supported by the -mrtm and -mhle switches.

Last but not least, GCC 4.8 supports the Intel FXSR, XSAVE and XSAVEOPT instruction sets with -mfxsr, -mxsave, and -mxsaveopt.

Aside from advancing Intel's processor support, GCC 4.8 also offers AMD Jaguar and Steamroller support. Steamroller is "Bulldozer 3" and Jaguar is AMD's upcoming Fusion APU.

Other GCC 4.8 highlights include a new optimization level, some performance advantages, libstdc++ improvements, new optimizations, better C++11 support and early C++1y support, improved diagnostics, is built in C++ mode, and many other additions.

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 Xeon E5-1680 v3 & E5-2687W v3 Compared To The Core i7 5960X On Linux
  2. Intel 120GB 530 Series SSD Linux Performance
  3. Btrfs/EXT4/XFS/F2FS RAID 0/1/5/6/10 Linux Benchmarks On Four SSDs
  4. AMD's Windows Catalyst Driver Remains Largely Faster Than Linux Drivers
Latest Linux Articles
  1. Mesa Git Yields Performance Improvements For Newer AMD GPUs
  2. Apple OS X 10.10 vs. Ubuntu 14.10 Performance
  3. Mesa 10.5-devel Brings Some Intel Haswell HD Graphics Changes Over Mesa 10.3
  4. NVIDIA vs. Nouveau Drivers With Linux 3.18 + Mesa 10.4-devel
Latest Linux News
  1. Qt 5.4 Planned For Release On 9 December
  2. Meizu's Ubuntu Phone Not Expected Until Early Next Year
  3. DragonFlyBSD 4.0 Drops i386 Support, Improves Graphics
  4. Expensive "Free/Libre Software Laptop" Uses A NVIDIA GPU
  5. QEMU 2.2-rc3 Released, Final Release Pushed Back By Couple Days
  6. 64-bit ARM FreeBSD Support Is Taking Shape
  7. GCW Zero Starts Seeing New Game Releases
  8. Intel's Cherry Trail Delayed To Next Year
  9. Bq Introduces More Android Devices, But Still No Ubuntu Phones
  10. Qt 5.4 Release Candidate Expected Later This Week
Latest Forum Discussions
  1. Updated and Optimized Ubuntu Free Graphics Drivers
  2. Hurrican SDL Port
  3. Roadmap to Catalyst 14.10 ?
  4. how to configure module phoromatic ?
  5. PulseAudio 6.0 Is Coming & Other Linux Audio Plans For The Future
  6. Debian Developer Resigns From The Systemd Maintainership Team
  7. Cant get working Kaveri APU - A10-7850k
  8. Script for Fan Speed Control