regparm guarantee

[Kimmo Fredriksson]

On Wed, 19 Nov 2003 y2bismil@engmail.uwaterloo.ca wrote:

> Hi,
>
> No, its not a problem of variable arguments.  There's no problem per se.  I'm
> just asking if its guaranteed or if its one of those GCC 'hints' that may or may
> not be done.

I suppose it just a hint, that may (will?) be ignored. On the other hand,
see:

http://gcc.gnu.org/onlinedocs/gcc/Explicit-Reg-Vars.html#Explicit%20Reg%20Vars

Kimmo

>
>
> Thanks,
>
> Yamin
>
> Quoting qinfeng.zhang@philips.com:
>
> > Is it the problem of vararg?
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > y2bismil@engmail.uwaterloo.ca
> > Sent by:
> > gcc-help-owner@gcc.gnu.org
> > 2003-11-19 04:41
> >
> >
> >         To:     GCC- help <gcc-help@gcc.gnu.org>
> >         cc:     (bcc: Qinfeng Zhang/SHA/RESEARCH/PHILIPS)
> >         Subject:        regparm guarantee
> >         Classification:
> >
> >
> >
> >
> >
> > I was wondering if by specifying regparam for a function if it is
> > GUARANTEED
> > that parameters passed to the function will be made via register.  I ask
> > this as
> > I'm interfacing with an assembly written library which links to external
> > c-code.
> >  When the assembly routines call c-function, there are some that are
> > stdcall,
> > and some pass variables through register (they only pass 1 variable as far
> > as I
> > can see in EAX).
> >
> > Is there any way to explicitly say "use EAX for this parameter?"
> > >From the wording of the manual under 'function attributes', it doesn't
> > appear
> > so.  But I might guess that it places the 1st paramter in EAX, second in
> > EBX,
> > then ECX, EDX.
> >
> > Thanks,
> >
> > Yamin
> >
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> >
> >
> >
>
>
>
>
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