Re: gcc and vfp instructions

["aram bharathi" <arambharathi at linuxmail dot org>]

hi

i have downloaded the gcc4.0 from the gcc web site
and i compiled the above program by the following option

main()
{
float a=88.88,b=99.99,c=0;
c=a*b;
printf("%f",c);
}

arm-elf-gcc -mfpu=vfp -S new.c

but it produces the new.s file without any special kind of (vfp 
instructions) instructions.

for example for multiplying a and b they havent used fmuls..

is there any special command line option should b given to produce new.s with fmuls

thanks


----- Original Message -----
From: "Richard Earnshaw" <rearnsha@gcc.gnu.org>
To: "aram bharathi" <arambharathi@linuxmail.org>
Subject: Re: gcc and vfp instructions
Date: Tue, 22 Mar 2005 09:52:20 +0000

> 
> On Tue, 2005-03-22 at 08:51, aram bharathi wrote:
> > hi,
> >    i like to know whether gcc can generate vfp instructions..
> >
> > main()
> > {
> > float a=88.88,b=99.99,c=0;
> > c=a+b;
> > printf("%f",c);
> > }
> >
> > i used the following option to compile the above program
> >
> > arm-elf-gcc -mfp=2 -S new.c
> >
> > but it produces the new.s file without any special kind of (vfp 
> > instructions) instructions
> > how to generate them using gcc
> >
> > or i have to use inline assembly for this operation for this
> >
> > if then, whether it will be supported on binutils and the gdb simulator
> >
> > thanks
> 
> gcc-4.0 will be the first FSF release to have VFP support.  CodeSourcery
> have a build of gcc-3.4 on their web site which has VFP support
> included.  The options needed to generate the VFP code are described in
> the manual.
> 
> R.

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