amd64 optimized gcc?

Kris Kennaway kris at
Thu May 26 08:55:25 PDT 2005

On Thu, May 26, 2005 at 10:13:35AM +1000, Michael VInce wrote:
> Interesting.
> I have been playing with GCC optimizations my self latterly and have 
> been wondering how much it helps, haven't done any benchmarks though.
> I some times wonder if the GCC people are doing good working with 
> optimization flags.
> I recently lost my hard drive on my ASUS A4K (AMD64) laptop,
> so bought a new 16meg cache 80gig Toshiba hard drive for it, while I 
> wait for warranty to come through on my old one.
> I did a buildworld under  'CPUTYPE=athlon64' in make.conf and 'CFLAGS= 
> -O2 -pipe -funroll-loops' for the the kernel.
> I also used both to build all my ports including xorg and KDE.

> All this combined has made my laptop feel a lot faster.

Google for 'placebo effect' :-) Unfortunately, leet optimization flags
do not measurably effect everyday system performance, only specific
CPU-intensive operations.

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