------- Comment #5 from hjl dot tools at gmail dot com 2010-09-01 16:37 -------
(In reply to comment #4)
> (In reply to comment #3)
> > (In reply to comment #2)
> > > gcc-4.5 is still hardmasked downstream in Gentoo, then, I am unsure about
> > > installing it :-/, are you sure this bug could be solved in 4.5* ?
> > >
> > 1. -march=native is changed in gcc 4.5.
> Will try then with 4.5.1 (4.5.2 is still not available on Gentoo)
> > 2. Your cpu is Core.
> > 3. -mtune=generic generates the fastest code for Core.
> > 4. Prescott and Core have the same instruction set.
> Is -mtune=generic better than -mtune=prescott? "man gcc" looks to suggest last
> one would be better:
> If you know the CPU on which your code will run, then you should use the
> corresponding -mtune option instead of -mtune=generic.
-mtune=generic is the best tuning option for Intel processors,
regardless whatever gcc manual says.