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Re: Recompiling packages for Pentium.

On Sun, 6 Jul 1997, Jason Gunthorpe wrote:

> On Sun, 6 Jul 1997, Jim Pick wrote:
> > 
> > > Is it possible, as some people mentioned, to recompile packages to take
> > > advantage of gcc-pentium.  This could be like the m68k port. 
> > 
> > I'm in favour of this - as long as the packages compiled for the 386 are
> > still available.  I've got a few 386's and 486's that are running Debian.
> Could someone please confirm weather pgcc actually makes use of any
> pentium specific instructions?
> I really doubt that it does, but your never know. Every 'Pentium'
> optimizing compiler I have used has only effected the choice of which 386
> instructions to use, ie some combinations pipeline better on the pentium
> but give a couple clock cycle hit on the 386.

I don't think that their are many "pentium specific instructions."  The
major additions to x86 instruction set came with MMX.  The way the pentium
is faster is that if you load the pipeline right, and do other stuff, the
pentium has features that speed it along, if you don't, it's probably hit
or miss.


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