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 Now Uses Loop Vectorizer At New Levels

Compiler

Published on 17 June 2013 04:37 PM EDT
Written by Michael Larabel in Compiler
1 Comment

The LLVM Loop Vectorizer is now being utilized by default at new optimization levels, in the name of faster performance.

Changed in the LLVM SVN/Git code for the LLVM 3.4 release (not the imminent LLVM 3.3) is greater use of the loop vectorizer, the compiler infrastructure's support for automatically vectorizing many different types of loops. This is a follow-up story to early in the month when talking about LLVM May Expand Its Use Of The Loop Vectorizer.

With the latest LLVM code, the loop vectorizer is turned on for the -O2 and -Os levels, the mid-optimization level for performance and the optimization level for the smallest resulting binary size, respectively. The vectorizer is being used in these new cases for faster performance. Previously this vectorizer was only used for -O3, the most aggressive optimization level.

Separately, LLVM also with the 3.3 release has the SLP Vectorizer but that's not touched by today's code commits.

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 Articles & Reviews
  1. Ubuntu 15.04 Offers Faster OpenGL For AMD Radeon GPUs On Open-Source
  2. Ubuntu 15.04 Brings Some Graphics Performance Improvements For Intel Haswell
  3. Sub-$20 802.11n USB WiFi Adapter That's Linux Friendly
  4. The Lenovo T450s Is Working Beautifully With Linux
  5. Linux 4.0 SSD EXT4 / Btrfs / XFS / F2FS Benchmarks
  6. Linux 4.0 Hard Drive Comparison With Six File-Systems
Latest Linux News
  1. Reasons To Make A PTS/OB Test Profile For Your Software
  2. Vivaldi TP3 Browser Adds Native Window Support On Linux
  3. A Brief Update On Fwupd For Linux Firmware Updating Of Devices
  4. Upgrading To KDE Plasma 5.3 On Kubuntu 15.04
  5. Ubuntu 15.10 Plans Being Discussed Next Week
  6. KDE Plasma 5.3 Released: Expands On Widgets, Bluetooth, PM
  7. Making It Easier To Deploy CUDA On Fedora
  8. GCC 4.9.2 vs. GCC 5 Benchmarks On An Intel Xeon Haswell
  9. Intel Haswell/Broadwell Power Use On Linux Still Moving Lower
  10. QEMU 2.3 Officially Released
Most Viewed News This Week
  1. Ubuntu's Desktop-Next Switching From .DEBs To Snappy
  2. Systemd Kills Off Shutdownd
  3. KDBUS Still Hasn't Been Pulled, Might Not Land For Linux 4.1
  4. My Favorite Computer Desk Of The Past Decade For Less Than $100
  5. AMD Open-Sources "Addrlib" From Catalyst
  6. Qt Creator 3.4 Brings C++ Programming Improvements & More
  7. Debian 8.0 Jessie Is Ready For Release This Weekend
  8. GIMP's Porting To GTK3 Continues