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Reply-To: "Frank J. Lhota" <NOSPAM.FrankLho@rcn.com>
From: "Frank J. Lhota" <NOSPAM.FrankLho@rcn.com>
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References: 
 <pan.2003.12.26.10.37.14.290567@n_o_p_o_r_k_a_n_d_h_a_m.abyss2.demon.co.uk>
 <3FEC43B2.5080606@noplace.com> <1072450300.440355@master.nyc.kbcfp.com>
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 <pan.2003.12.26.15.39.28.529093@n_o_p_o_r_k_a_n_d_h_a_m.abyss2.demon.co.uk>
 <1072458199.346049@master.nyc.kbcfp.com>
 <pan.2003.12.26.17.08.27.898789@n_o_p_o_r_k_a_n_d_h_a_m.abyss2.demon.co.uk>
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 <tQCIb.1395$x34.387@nwrdny02.gnilink.net>
 <1072891494.595791@master.nyc.kbcfp.com>
 <R5FIb.23183$tY5.8488@nwrdny01.gnilink.net>
 <1072899508.453543@master.nyc.kbcfp.com>
 <aBGIb.1657$x34.18@nwrdny02.gnilink.net>
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Subject: Re: GNAT parameter passing, C-style?
Date: Thu, 1 Jan 2004 19:25:39 -0500
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Date: 2004-01-01T19:25:39-05:00
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"Jano" <nono@celes.unizar.es> wrote in message
news:MPG.1a5e7497a07ca7709897ad@News.CIS.DFN.DE...
> Frank J. Lhota dice...
> > "Hyman Rosen" <hyrosen@mail.com> wrote in message
> > news:1072899508.453543@master.nyc.kbcfp.com...
> > > This is vanilla C for that platform. Varargs functions are called the
> > > same way. The function itself will then muck about with the registers
as
> > > needed to make things work.
> >
> > Now I get it! The problem is that I have spent most of my career with
the
> > Intel architecture, where the paucity of registers preclude any
extensive
> > use of registers for parameter passing. Of course, passing parameters by
> > registers avoids all of these issues, since nothing is pushed onto or
popped
> > off the stack.
>
> I remember from my days of assembler of some compiler which used
> frequently the AX register for the first parameter and function results.
> Though it was maybe a Pascal compiler %-)
>
> Just a curiosity.

There is still a x86 convention that functions returning integers return
them in AX / EAX.