[LLVMdev] arm compiler benchmarks

[matic at nimp.co.uk]

Hi, 

I didn't do any serious benchmarking but so far I never found
a case where LLVM does better than IAR on CortexM0, but I saw a lot of
cases where IAR output is better than LLVM... 

That said I did not use
-Os or -Oz, I just used -O3. 

A recurrent situation is that LLVM
push/pop one or two extra registers compared to IAR, I guess it does so
in order to comply with a standard ABI or something but in the world of
deeply embedded system, we don't care of such things 99.99% of the
time... 

If you want to see some good code output, take a look at IAR,
there is a free version limited in code size online. 

Cheers,


Sebastien 
 
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