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LLVM 2.8 is availableLLVM 2.8 is availablePosted Oct 12, 2010 16:09 UTC (Tue) by bronson (subscriber, #4806)In reply to: LLVM 2.8 is available by PaXTeam Parent article: LLVM 2.8 is available
Very cool! Have you formed a gut feeling for performance? Either compile time or generated code?
Just curious about real-world experiences.
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LLVM 2.8 is available Posted Oct 12, 2010 17:17 UTC (Tue) by PaXTeam (subscriber, #24616) [Link]
> Have you formed a gut feeling for performance? Either compile time or generated code?
i haven't had time for benchmarks (and i don't actually know what would exercise various kernel subsystems/paths well enough, kernel compilation isn't exactly it ;) but based on the generated code and overall code size, clang generates about 3% fatter code than gcc (at least with -Os, i didn't try -O2). as for compile time, i only tested llvm 2.7 last spring and the times for compiling the same kernel/.config were something like this: gcc 4.4.x: 20 mins, llvm-gcc: 18 mins, clang: 16 mins.
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