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Re: gcc -O1 performs better than gcc -O2


Jakub Jelinek <jakub@redhat.com> wrote on 2010/02/14 20:21:50:
>
> On Sun, Feb 14, 2010 at 08:06:20PM +0100, Joakim Tjernlund wrote:
> > the warmup isn't really needed after I added memset and inline or not should
> > not matter that much are only used once so I think my
> > conclusion still stands: gcc 4.3.4 is slower with -O2 than -O1
>
> You mean this particular GCC version on this particular benchmark.

Yes of course

> You'd need to benchmark orders of magnitude more code to be able to
> talk about -O1 vs. -O2 in general.  ;)

Sure, but I figured that this was bad enough to report. Especially
since both the old and the new crc16 was worse at -O2 than -O1

 Jocke



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