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LLVM Clang Works On Profile-Guided Optimizations

Compiler

Published on 14 January 2014 02:24 AM EST
Written by Michael Larabel in Compiler
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Profile-Guided Optimization (PGO) support is landing within LLVM's Clang C/C++ compiler in catching up to feature parity with GCC and their never-ending effort to improve performance of compiled binaries.

For those not normally excited by compilers, Profile-Guided Optimizations are a means of profiling a compiled program so that on subsequent compilations the compiler can better optimize the code for improved run-time performance. PGO is very different from traditional source-level optimizations and it's taken some time for Clang to implement the support besides the fact not many utilize this compiler optimization technique due to it being time intensive with requiring multiple compilations plus run-time profiling.

With a code commit that hit Clang mainline last week, there's now the initial instrumentation for Profile Guided Optimizations. While the code is still in early form, proper Clang PGO support will hopefully be a feature of LLVM 3.5.

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 .
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