Optimize glibc for Pentium 4

[H. J. Lu]

On Thu, May 22, 2003 at 01:15:06PM -0700, Ulrich Drepper wrote:
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> H. J. Lu wrote:
> 
> >    /* XXX Which others to add here?  */
> > -  HWCAP_IMPORTANT = (HWCAP_I386_MMX)
> > +  HWCAP_IMPORTANT = (HWCAP_I386_MMX | HWCAP_I386_XMM | HWCAP_I386_XMM2)
> 
> This won't go in.
> 
> Yes, MMX is not very useful and maybe it should be removed.  But XMM and
> XMM2 are falling in the same category.  Applications which benefit can
> explicitly enable this using the environment variable.
> 
> I realize that you want to misuse the xmm/xmm2 paths to enable general
> p4 optimization.  That's bogus.  It's only for xmm/xmm2 features.
> 
> If you want  specific path for p4 etc then get the kernel to report the

I want ld.so to load a different libc.so.

> real processor type and not i686.  This is a long overdue extension.
> 

I will talk to kernel people on that.


H.J.