Date:	Fri, 12 Mar 1999 04:07:58 +0100
To:	pgcc AT delorie DOT com
Subject:	Re: AMDK6/ PPro instructions
Message-ID:	<19990312040758.O16842@cerebro.laendle>
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In-Reply-To:	<19990312003221.C20937@math.fu-berlin.de>; from Felix von Leitner on Fri, Mar 12, 1999 at 12:32:21AM +0100
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From:	Marc Lehmann <pcg AT goof DOT com>
Reply-To:	pgcc AT delorie DOT com
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On Fri, Mar 12, 1999 at 12:32:21AM +0100, Felix von Leitner wrote:
> > >   Are you sure about this ?  AFAIK the AMD K6 implements the pentium
> > >   instruction set CMOVZ e.t.c.  are not implemented. It is the Cyrix M2
> > >   which implements the full pentium-pro instruction set.
> > As I said, I'm not sure. Pitty on AMD that they are unable to create a
> > reasonable cpu ;)
> 
> Why do you spread slander like this, then?

As other people have pointed out, AMD lacks these instructions, so its not
really "slander". Also, haven't you noted the smiley???

> actually create them.  I just compiled some test code with
> -march=pentiumpro on that machine and it ran OK, it was the "Request"
> program in the test subdirectory of the Hermes pixel conversion library.

This only proves 1. that pgcc still does not use them as aggressively as
it should and 2. that a compiler is not forced to use every instruction in
every program...

> > Until somebody corrects me I take it for granted that -march=pentiumpro
> > programs won't run on amd-k6 (Mark: isn't that a question for the faq ;?)
> 
> Which program can I try to use that will actually make pgcc create some
> of those instructions?

Any program might. egcs/pgcc is not yet very aggressive about generating
these, but most larger programs have enough of them in them so they won't
work on incompatible chips (glibc, pgcc, perl...).

--  
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      ---==---(_)__  __ ____  __       Marc Lehmann      +--
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    The choice of a GNU generation                       |
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