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From: "Mark Cuss" <mcuss@cdlsystems.com>
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References: <20011204153416.A24659@disaster.jaj.com><Pine.LNX.4.33.0112042032530.27017-100000@kern.srcf.societies.cam.ac.uk><20011204155032.A24992@disaster.jaj.com><00d001c17d05$4be398c0$160e10ac@hades> <3C0D3A05.6FE3602F@redhat.com><00cc01c18271$ef4c12a0$160e10ac@hades> <org06hcxj1.fsf@free.redhat.lsd.ic.unicamp.br>
Subject: Re: Embedded Assembly and MMX in GCC
Date: Tue, 11 Dec 2001 13:00:00 -0000
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Yes, I did have the closing double quote - I forgot to type it into the
message......

 If I put two %'s in front of mm0, the assembler returns "bad register name
`%%mm0` "

With the one %, it says "suffix or operands invalid for `movq`"

It seems that on an inline statement, I need to put only 1 % in front of reg
names if there are no input or output variables, and 2 %'s if there are...

Mark


----- Original Message -----
From: "Alexandre Oliva" <aoliva@redhat.com>
To: <mcuss@cdlsystems.com>
Cc: <grahams@redhat.com>; <gcc@gcc.gnu.org>
Sent: Tuesday, December 11, 2001 1:27 PM
Subject: Re: Embedded Assembly and MMX in GCC


> On Dec 11, 2001, "Mark Cuss" <mcuss@cdlsystems.com> wrote:
>
> > __asm__("movq $1, %mm0);
>
> I suppose you're missing a `"' after `%mm0'.
>
> Note that `%' is an active character in inline assembly, mostly like
> printf.  If you want a `%' to get through to the output assembly,
> double it.
>
> --
> Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
> Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
> CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
> Free Software Evangelist    *Please* write to mailing lists, not to me
>