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Re: gcc compile-time performance


On Sat, May 18, 2002 at 09:24:25PM -0700, David S. Miller wrote:
>    From: Marc Espie <espie@quatramaran.ens.fr>
>    Date: Sat, 18 May 2002 13:46:43 +0200
>    
>    In case you have missed this, I pitted gcc 2.95.3 -O2 against gcc 3.1 -O1,
>    to see which one was fastest. On the same source. Something big enough to
>    be relevant: a BSD kernel.
>    
>    gcc 2.95.3 wins hands down, by about 20%.
>    
> Hey Marc, could you run your tests with this patch applied
> to gcc-3.1?  It should kill ~10% or more of the compile time
> overhead when optimizations are enabled.

Not significant on x86... not more than 2 seconds difference, out of
several minutes, both in -O2 and -O1 mode.

:(


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