AMD Piledriver/Trinity A10-5800K Compiler Tuning
Written by Michael Larabel in Software on 16 October 2012. Page 4 of 4. 9 Comments

Similar to C-Ray, Smallpt saw improvements out of the instruction sets introduced in Barcelona and the first-generation Bulldozer processors, but bdver2 wasn't meaningful for the AMD A10-5800K Piledriver APU.

The Opus audio encoding and Nero2D benchmarks also didn't benefit from targeting "bdver2" with GCC 4.7.2 on the AMD A10-5800K compared to the "bdver1" micro-architecture target.

Having GCC 4.7.2 take advantage of the FMA3, BMI, TBM, and F16C instruction sets by using the -march=bdver2 flag for the AMD A10-5800K APU wasn't of any measurable benefit for the open-source Linux benchmarks tested that ranged from audio encoding to ray-tracing to image manipulation and molecular biology. The only potential improvement spotted with bdver2's additions were image blurring within GraphicsMagick.

When AMD rolls out their new Bulldozer 2 Vishera CPUs it will be tested again from the GCC 4.8 code-base that's presently under development to look for any further compiler optimizations. There's also LLVM/Clang compiler testing to do from AMD's Piledriver processor cores.

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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 or contacted via MichaelLarabel.com.

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