[LLVMdev] slow on raspberry pi
torsten at villataika.fi
Fri Jan 18 03:03:08 PST 2013
I have been reading about llvm and clang and vmkit, and must say: great work guys.
So when i got my raspberry pi, and having read that llvm is better at arm than gcc, i compiled llvm on the pi. The pi has a soc with armv6 (i don't know what that means exactly though).
The pi is not fast and llvm with clang compilation took 22 h, but worked. hurrah.
Then i compiled llvm/clang with itself and was pleased it took "only" 12 hours. even better.
But then I compiled linpack and clang numbers were less than 1/4 off gcc compiled :-( (9000kFlops about)
Now according to this http://elinux.org/RPi_Performance there is something with compiler settings, hard/soft floats and possibly the exact target (armv6XXX) of the pi to make it better.
My question is: has anybody else tried this, or could tell me what i could try to remedy this.
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