Re: Bug#164766: Problem with VIA C3 chip and libcrypto

[Daniel Jacobowitz <dan@debian.org>]

On Tue, Jan 28, 2003 at 02:39:06AM +0900, GOTO Masanori wrote:
> At Mon, 27 Jan 2003 11:39:43 -0500 (EST),
> Alan Cox wrote:
> > > >>>>>GCC 3.2 still uses CMOVE instructions on -march=i686.
> > > >>>>>
> > > >>>>>On the other hand:
> > > >>>>>     {"c3", PROCESSOR_I486, PTA_MMX | PTA_3DNOW},
> > > >>>>>GCC disagrees with you that the C3 is an i686.
> > 
> > gcc uses i486 scheduling because that gives best performance
> > 
> > The situation is as follows
> > 
> > gcc "i686" definition is wrong. The gcc people wont fix it because the 686
> > definition without cmov is mostly useless anyway.
> 
> Thanks for your explanation.  Hmm.  "cmov" is really key instruction...
> 
> I think it may be needed that we add -mcpu=c3 for gcc, which generates
> i686 without cmov instruction.

It's already there in development GCC versions.  I think Andi Kleen did
it.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer