Linked by Michael on Tue 29th Mar 2011 23:53 UTC
Benchmarks "Version 4.6 of GCC was released over the weekend with a multitude of improvements and version 2.9 of the Low-Level Virtual Machine is due out in early April with its share of improvements. How though do these two leading open-source compilers compare? In this article we are providing benchmarks of GCC 4.5.2, GCC 4.6.0, DragonEgg with LLVM 2.9, and Clang with LLVM 2.9 across five distinct AMD/Intel systems to see how the compiler performance compares."
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Note that -O2 is used in GCC because it often (usually?) produces faster code than -O3. For some discussion on the topic, see Gentoo's documentation page on optimization flags: . Basically, it sounds like the GCC optimization levels are the separated by the amount of work the compiler has to do to optimize the code, and the extra work done by the -O3 optimizations tends to increase code size (and therefore hurt caching) so it often slows down programs.

That said, testing compilers at multiple optimization levels would likely be more informative about how good their optimizations actually are.

Edited 2011-03-30 20:34 UTC

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