LLVM/Clang 3.3 Performing Against GCC For Old Intel CPU

Written by Michael Larabel in Software on 23 April 2013. Page 3 of 3. 5 Comments

GCC 4.7.3 had a slight advantage over LLVM/Clang for the Himeno Poisson Pressure Solver.

LLVM/Clang continues to lead over GCC when it comes to compilation times.

With C-Ray we have found some noted performance improvements out of the latest LLVM/Clang 3.3 code-base, but for this older Intel Core 2 Duo processor the results are unchanged compared to LLVM/Clang 3.2 stable.

The OpenMP-using Primesieve managed to favor GCC 4.7.3 for the dual-core Intel T5600.

There was no real compiler difference with the Apache benchmark results.

LLVM/Clang overall is performing close to on-par with GCC when it comes to the resulting binary performance for the aging Intel Core 2 Duo. With our other published benchmark results of LLVM/Clang 3.3 we have found some notable performance improvements over the stable LLVM/Clang 3.2 release from last December when using new Intel processors, but for this T5600 "Merom" system there doesn't appear to be much to look at in the way of new performance changes.

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Michael Larabel

Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via MichaelLarabel.com.