var_args for rs6000 backend

[Yao qi]

>From: Andrew Pinski <pinskia@physics.uc.edu>
>To: qiyaobit@hotmail.com (Yao qi)
>CC: ian@airs.com, gcc@gcc.gnu.org
>Subject: Re: var_args for rs6000 backend
>Date: Fri, 9 Sep 2005 01:51:58 -0400 (EDT)
>
> > BTW, I am concerned about the value of TARGET_HARD_FLOAT and 
>TARGET_FPRS,
> > I think both of them is 1 here, because I built GCC natively on POWER, 
>but
> > when I trace
> > it , I found it skips this condation statement as if ARGET_HARD_FLOAT is 
>0,
> > I do not know
> > why.
> >
> > I have searched TARGET_HARD_FLOAT in GCC internals for GCC 3.3.5 and 
>found
> > nothing about it.  Could anyone tell me which file define these two 
>macros?
> >
> > I grep it in gcc/config/rs6000/ but it seems that there is no file 
>define
> > it.  Could
> > anybody here have a look at it and verify it for me, any comments are 
>highly
> > appreicated.
>
>TARGET_HARD_FLOAT is defined by the options generating file.  So it is
>defined in rs6000.opt:
>mhard-float
>Target Report RejectNegative InverseMask(SOFT_FLOAT, HARD_FLOAT)
>Use hardware floating point

Do you mean the value of TARGET_HARD_FLOAT is *1* when option -mhard-float
is specified according to rs6000.opt ?

I tried to specify this option and it seems useless to set 
TARGET_HARD_FLOAT.

If so, that is to say, in rs6000_gimplify_va_arg() , the condations 
statement in
line 5734,
   5733
   5734   if (TARGET_HARD_FLOAT && TARGET_FPRS
   5735       && (TYPE_MODE (type) == SFmode || TYPE_MODE (type) == DFmode

is *always* FALSE and all the float  parameters wiil be passed in GPRs 
instead of FPRs.
Am I right?  Everyone here could verify or deny it, thanks in advance!

>
>But that does not sense as the default value for powerpc-linux-gnu
>is hard floats.
>
>Thanks
>Andrew Pinski


Best Regards
----------------
Yao Qi
Bejing Institute of Technology

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