From: Nate Eldredge <neldredge AT hmc DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Assembly in DJGPP (MMX etc)
Date: Sun, 05 Sep 1999 12:40:21 -0700
Organization: Harvey Mudd College
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Duncan Coutts wrote:
> 
> I know the standard gcc inline assembler uses the AT&T syntax rather than
> the more common intel notation. I suspect (but an no sure) that the inline
> assembler is not very recent and does not support new instructions eg MMX,
> P6 or 3DNOW (I noticed that it doesn't even support segment override
> prefixes! - see farptr.h).
> My question therefore is what is the best way to include assembly (including
> new instruction sets - MMX in particular) into my programs. Also, I don't
> suppose there is any chance of inlining instead of linking?
> My aim is to optimise the rendering and geometric transformation routines in
> my 3D engine using MMX instructions.
> 
> Thanks in advance for any suggestions.

Actually, I think Binutils 2.9.1 does support MMX, and more recent
snapshots support 3dnow and and the other Instructions Of The Week. 
(Note that IIRC 2.9.1 has a bug where it generates the wrong opcode for
`pand'.)

GNU as *has* supported segment overrides since time out of mind, but in
some versions they were buggy.  farptr.h uses the .byte method in case
it encounters one of these versions.
-- 

Nate Eldredge
neldredge AT hmc DOT edu