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LLVM/Clang 3.2 Compiler Competing With GCC

Michael Larabel

Published on 27 December 2012
Written by Michael Larabel
Page 2 of 5 - 20 Comments

Kicking things off with some molecular biology benchmarks, for HMMer the latest LLVM/Clang 3.2 release is still slower than GCC. GCC 4.8 wasn't any faster than GCC 4.7, but LLVM/Clang 3.2 is slightly slower still and wasn't improved between the 3.1 and 3.2 releases. (For the compiler flags noted, the -lm part can be ignored as for some cases LLVM/Clang 3.1 had problems with the -march=native mode on the Intel Ivy Bridge processor so the ordering was switched around.)

LLVM/Clang 3.2 is close behind the modern GCC releases tested on this Ivy Bridge processor.

For the new BLAKE2 crypto algorithm, the benchmark wouldn't build with LLVM/Clang 3.1 but it now works with LLVM/Clang 3.2. The Clang performance was shortly behind that of the GNU Compiler Collection.

LLVM/Clang secures a win when it comes down to the Monte Carlo test within SciMark. GCC 4.8 makes some performance gains over GCC 4.7 for this computational test, but LLVM/Clang 3.2 remains noticeably faster on the Intel processor.

There isn't much difference between LLVM/Clang and GCC for the Fast Fourier Transform workload.

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