regparm guarantee

[y2bismil@engmail.uwaterloo.ca]

http://gcc.gnu.org/onlinedocs/gcc-3.3.1/gcc/Function-Attributes.html#Function%20Attributes
--regparm 

This is the section in question.  This is about parameter passing not variable
declaration.

Yamin

Quoting Kimmo Fredriksson <kfredrik@cs.joensuu.fi>:
> 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
> > >
> > > ----------------------------------------
> > > This mail sent through www.mywaterloo.ca
> > >
> > >
> > >
> >
> >
> >
> >
> > ----------------------------------------
> > This mail sent through www.mywaterloo.ca
> >
> 




----------------------------------------
This mail sent through www.mywaterloo.ca