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

LLVM Clang 3.4 SVN Compiler Optimization Level Tests

Michael Larabel

Published on 30 July 2013
Written by Michael Larabel
Page 1 of 4 - 1 Comment

To complement the LLVM 3.4 SVN compiler benchmarks from yesterday that were looking at the impact of using the SLP Vectorizer that's soon to be enabled by default for some optimization levels, here are some more LLVM Clang compiler development benchmarks. This time around are fresh benchmarks of the open-source C/C++ compiler when trying out the different compiler optimization levels, including -O0, -O1, -O2, -Os, -O3, and -Ofast.

From the LLVM, Clang, and Compiler-RT Subversion repositories as of this weekend, a fresh optimized build of LLVM/Clang 3.4 (no assertions, enable optimizations) was used for testing the -O0, -O1, -O2, -Os, -O3, and -Ofast optimization levels. Most Phoronix readers are well versed on the different optimization levels, but the higher the number, the more optimizations that are applied by the compiler. The -Os level is for optimizing the binary for size while -Ofast is the highest standard optimization level and relies upon the potentially unsafe fast-math.

These straightforward compiler benchmarks were done from a ThinkPad W510 laptop with Intel Core i7 720QM quad-core processor with Hyper Threading. Ubuntu 13.10 was running on the system with the Linux 3.11 kernel. All of the compiler benchmarks were done through the Phoronix Test Suite software.

Latest Articles & Reviews
  1. Sub-$20 802.11n USB WiFi Adapter That's Linux Friendly
  2. The Lenovo T450s Is Working Beautifully With Linux
  3. Linux 4.0 SSD EXT4 / Btrfs / XFS / F2FS Benchmarks
  4. Linux 4.0 Hard Drive Comparison With Six File-Systems
  5. Lenovo ThinkPad T450s Broadwell Preview
  6. How Open-Source Allowed Valve To Implement VULKAN Much Faster On The Source 2 Engine
Latest Linux News
  1. Daily Builds Of Wayland & Weston For Ubuntu Linux
  2. AMD Open-Sources "Addrlib" From Catalyst
  3. AMD Releases New "AMDGPU" Linux Kernel Driver & Mesa Support
  4. A Gigabyte Sandy/Ivy Bridge Motherboard Now Handled By Coreboot
  5. Linux 3.16 Through Linux 4.0 Performance Benchmarks
  6. Intel's Windows Driver Now Supports OpenGL 4.4, Linux Driver Still With OpenGL 3.3
  7. DRM Graphics Updates Sent In For The Linux 4.1 Kernel
  8. More eBPF Improvements Heading To Linux 4.1
  9. LLDB Is Getting Into Shape For Linux 64-bit Debugging
  10. Wine-Staging 1.7.41 Works On Improved Debugging Support
Most Viewed News This Week
  1. Nouveau: NVIDIA's New Hardware Is "VERY Open-Source Unfriendly"
  2. LibreOffice 4.5 Bumped To Become LibreOffice 5.0
  3. Linux Audio Is Being Further Modernized With The 4.1 Kernel
  4. KDBUS Is Taking A Lot Of Heat, Might Be Delayed From Mainline Linux Kernel
  5. VirtualBox 5.0 Beta 2 Released
  6. ZFS & Libdvdcss Should Soon Be In Debian
  7. Ubuntu 15.04 Now Under Final Freeze
  8. EXT4 In Linux 4.1 Adds File-System Level Encryption