From: "Matt" <para AT tampabay DOT rr DOT com>
Newsgroups: comp.os.msdos.djgpp
References: <Pine DOT SUN DOT 3 DOT 91 DOT 1010702091418 DOT 3012G-100000 AT is> <9htlpv$o5t$1 AT news DOT tpi DOT pl>
Subject: Re: Accessing registers from C
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Date: Wed, 04 Jul 2001 04:55:00 GMT
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To: djgpp AT delorie DOT com
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"Jacek K." <xos AT o2 DOT pl> wrote in message news:9htlpv$o5t$1 AT news DOT tpi DOT pl...
>
> Uzytkownik "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il> napisal w wiadomosci
> news:Pine DOT SUN DOT 3 DOT 91 DOT 1010702091418 DOT 3012G-100000 AT is...
> >
> > On Sun, 1 Jul 2001, Jacek K. wrote:
> >
> > > Are there some instructions/macros to access CPU registers?
> >
> > Can you tell what do you need that for?  DJGPP has several provisions
> > in the library which normally make accessing the registers
> > unnecessary.  Section 17.8 of the FAQ gives a couple of examples.
>
> I need to call a procedure via call gate. Because arguments must be passed
> "manualy", doing it by registers will be faster then by stack.
>
> Jacek

If I'm not mistaken, you can do this by doing the following:
void my_func(...) __attribute___((regparm(3)));

// the function body
void my_func(...)
{
}

Requires no inline assembly, and it's easier (in my opinion).