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

GCC 4.8 vs. LLVM/Clang 3.3 On Intel's Core i7 4770K

Michael Larabel

Published on 21 June 2013
Written by Michael Larabel
Page 1 of 3 - 14 Comments

Complementing the earlier Phoronix article about optimized binaries for Intel Haswell CPUs via the "-march=core-avx2" Haswell compiler optimizations, in this article is a comparison of the GCC and LLVM/Clang compilers when targeting the new Core i7 4770K CPU. GCC 4.7.3, GCC 4.8.1, LLVM Clang 3.2, and LLVM Clang 3.3 were the tested compilers under Ubuntu Linux when seeing how well these different compilers optimized for Haswell.

For this testing, GCC 4.7.3/4.8.1 and LLVM Clang 3.2/3.3 were all built from source and using similar configure options for producing release-ready optimized builds. A variety of open-source C/C++ tests were carried out on the competing compilers while using the same CFLAGS/CXXFLAGS across all of the testing. All benchmarking was handled in a fully automated and reproducible manner using the Phoronix Test Suite benchmarking software for Linux, OS X, BSD, Solaris, and Windows platforms.

The CFLAGS/CXXFLAGS set for the environment were "-O3 -march=core-avx2". In Terms of the core-avx2 optimizations, see the earlier article on optimized binaries for Haswell. Both GCC 4.7 and LLVM Clang 3.2 had early support for Intel Haswell CPUs, but the support is now much more polished in the latest releases of GCC 4.8 and LLVM Clang 3.3.

This compiler comparison and testing is quite straightforward so let's get immediately to the results from this Core i7 4770K system running an Ubuntu 13.10 development snapshot with the Linux 3.10 kernel.

Latest Linux News
  1. Radeon & AMDGPU DRM Fixes Queue Up For Linux 4.2
  2. KDE Applications 15.04.3 Fixes Bugs
  3. Benchmarks Of 54 Different Intel/AMD Linux Systems
  4. Linux 4.2 Bringing Support For ARCv2, HS38 CPU Cores
  5. Libdrm 2.4.62 Is An Important Update For Open-Source GPU Drivers
  6. The State of Unity 3D Game Engine, Editor On Linux
  7. ZFS On Linux 0.6.4.2 Brings Linux 4.1 Support, Fixes
  8. Old Net Burst Tests, Ubuntu Phone & Assembly x86 Were Popular Topics Last Month
  9. Qt 5.5 Officially Released
  10. Global Shortcuts In KDE Plasma Under Wayland
Latest Articles & Reviews
  1. How KDE VDG Is Trying To Make Open-Source Software Beautiful
  2. Attempting To Try Out BCache On The Linux 4.1 Kernel
  3. CompuLab's Fitlet Is A Very Tiny, Fanless, Linux PC With AMD A10 Micro
  4. AMD A10-7870K Godavari: RadeonSI Gallium3D vs. Catalyst Linux Drivers
Most Viewed News This Week
  1. Kubuntu 15.10 Could Be The End Of The Road
  2. KDBUS Won't Be Pushed Until The Linux 4.3 Kernel
  3. The State & Complications Of Porting The Unity Editor To Linux
  4. The Staging Pull For Linux 4.2: "Big, Really Big"
  5. Latest Rumor Pegs Microsoft Wanting To Buy AMD
  6. SteamOS "Brewmaster" Is Valve's New Debian 8.1 Based Version
  7. Jonathan Riddell Steps Down From The Kubuntu Council
  8. ARM Posts Pictures Of AMD's New Development Board