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Re: GCC 4.1.0 Released

On Wed, Mar 01, 2006 at 10:43:40PM +0100, Richard Guenther wrote:
> On 3/1/06, H. J. Lu <> wrote:
> > On Wed, Mar 01, 2006 at 10:06:57PM +0100, Steven Bosscher wrote:
> > > On Wednesday 01 March 2006 21:49, H. J. Lu wrote:
> > > > It is the issue of quality of gcc 4.1 on IA32/x86-64. The current gcc
> > > > 4.1 performs very poorly on IA32/x86-64, comparing against gcc 4.2.
> > >
> > > Oh, really?  Where are the numbers you have to support this, may I
> > > say, unlikely claim?
> >
> > Here are diffs of SPEC CPU 2K between before and after with gcc 4.1
> > using "-O2 -ffast-math" on Nocona:
> Please post more meaningful numbers, like a comparison to -mtune=nocona,
> not whatever you used (the old default is i386 or i586).

That is the whole point: I'd like to back port the -mtune=generic
change to 4.1 branch. There are so many different IA32/x86-64
processors. The default optimization is more useful than -mtune=xxx.
The new default (-mtune=generic) is much better than the old one for
the current IA32/x86-64 processors.


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