Running GCC 4.9 With Intel's Core i7 "Core-AVX2"
Written by Michael Larabel in Compiler on 27 June 2013 at 01:32 AM EDT. Add A Comment
I've already delivered GCC vs. LLVM Clang compiler benchmarks on Intel's Core i7 4770K "Haswell" platform and tested the "core-avx2" optimizations offered by the latest compilers. That previous testing was done from the stable releases of LLVM Clang 3.1/3.2 and GCC 4.7/4.8 releases, but looking ahead, here's some benchmarks of the latest GCC 4.9 development snapshot.

GCC 4.8.1 stable was benchmarked against the GCC 4.9 2013-06-23 snapshot to see if there's any other performance changes yet for this next compiler release. Version 4.9 of the GNU Compiler Collection isn't expected until 2014 with the 4.8 series having just been stabilized in March. Among the changes already found in GCC 4.9 is colorizing of GCC diagnostics, many C++1y features have been implemented, and other changes have taken place.

Anyhow, the quick benchmarks between GCC 4.8.1 and GCC 4.9.0 2013-06-23 from the Core i7 4770K system can be found on OpenBenchmarking.org within 1306266-SO-GCC49INTE20. The CFLAGS/CXXFLAGS during testing were set to -O3 and -march=core-avx2 for hitting all of the Intel Haswell CPU instruction set extensions.

For many CPU benchmarks, GCC 4.9 doesn't (yet) deliver any major performance changes over the binaries yielded by GCC 4.8.1.

For some benchmarks though, the GCC 4.9 SVN code is already getting faster, at least for the high-end Intel Core i7 Haswell processor.

One of the test cases where GCC 4.9.0 yielded the biggest leap in performance was the Himeno Pressure Solver.

See the rest of these early GCC 4.9 Intel x86_64 Linux benchmarks at OpenBenchmarking.org.
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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 Twitter or contacted via MichaelLarabel.com.

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