On Wed, Mar 01, 2006 at 10:43:40PM +0100, Richard Guenther wrote: > On 3/1/06, H. J. Lu <[EMAIL PROTECTED]> 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. H.J.
