GCC 4.9 vs. LLVM Clang 3.5 On Intel's Haswell-E Platform Under Linux
Written by Michael Larabel in LLVM on 11 September 2014 at 12:45 PM EDT. 15 Comments
LLVM --
With my Intel Core i7 5960X Haswell-E Linux review out there, one of the quick to be requested extra tests is benchmarking the i7-5960X 16-thread processor with LLVM/Clang against GCC. Here's some initial data comparing the compilers for this $1000+ processor.

From the Core i7 5960X system with Gigabyte X99-UD4-CF motherboard, 16GB DDR4 memory, and 128GB SSD, Ubuntu 14.10 was running on the system with its stock Linux 3.16 kernel. For this quick, one-page testing of the i7-5960X compilers I used the packaged GCC 4.9.1 amnd LLVM Clang 3.5.0 compilers found within the Ubuntu 14.10 package archive.


A variety of C/C++ benchmarks were used with compiling the benchmarks under each compiler while maintaining the same CFLAGS/CXXFLAGS. Those wanting to see the results can find them by clicking on 1409114-PTS-COREI75928 for these OpenBenchmarking.org-hosted Linux compiler benchmarks by the Phoronix Test Suite.


Those with other Linux hardware test requests can post in our forums or let me know on Twitter. Test priority from feedback is given to Phoronix Premium subscribers.
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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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