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Re: Floatting point operation on PowerPC
Try adding '-mhard-float' to the command line. You shouldn't need to do
this, but it's possible I mis-configured it to default to software
floating point.
Please let me know if this solves the problem for you.
Scott
Olivier DERVYN wrote:
>
> Brendan Simon a écrit :
> >
> > You need to have specify a linker script and a startup file. Look at the
> > documetation on http://www.objsw.com/download.html. The example there shows
> > how to use the gcc command line for the bcc target. The "-T bdd.ld"
> > specifies that this linker script is to be used. You can copy on out of the
> > ppc subdirectories and rename it to whatever you want. eg. foo.ld You also
> > need a startup assembler file which will initialize the ROM, RAM and stack.
> > Once this is done you can jump to C routines and do the rest of the
> > initialization. The startup file is usually called crt0.S or something
> > similar (eg. bcc-crt0.S, bcc-startup.S, ...). You need to copy one from the
> > ppc subdirectory and modify it to suit your target. It generally uses
> > symbols defined in the linker script so they it you will need to understand
> > both. Look at the linker documentation for explanations of the commands.
> >
> > Brendan Simon.
> >
> > Olivier DERVYN wrote:
> >
> > > I have downloaded XGCC from your web site and I want use it
> > > to build PowerPC binary.
> > > I have installed compiler and tools (xgcc.zip, ppc.zip, ppc-gdb.zip,
> > > ppc-1.zip, lsrc180.zip).
> > > When I want to build a little program there is several error
> > > message as :
> > > c:\xgcc\bin/ld.exe: cannot open crt0.o: No such file or directory
> > > (ENOENT)
> > > I think my compiler isn't correctly configured.
> > >
> > > ppc.zip create a sub-tree called ppc\2_8_1\ etc..., What I do with
> > > this files ?
> > >
> > > Can you help me ?
> > >
> > > --
> > > Regards,
> > >
> > > Olivier DERVYN
> > >
> > > --
> > > Cordialement,
> > >
> > > Olivier DERVYN
> >
> > _______________________________________________
> > New CrossGCC FAQ: http://www.objsw.com/CrossGCC
> > _______________________________________________
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> > body of the message.
>
> To evaluate GCC perf. as Power PC compiler. I have compiled
> following prg :
>
> #define N 10
>
> int main()
> {
> float a;
> float X[N],Y[N];
> int cpt, cpt1;
> float b;
>
> a = 0.0;
>
> for( cpt1 = 0; cpt1 < N ; cpt1++ )
> {
> X[cpt1] = 1.0;
> Y[cpt1] = 2.0;
> }
>
> for( cpt = 0; cpt < N ; cpt++ )
> {
> a += X[cpt] * Y[cpt];
> }
>
> b = (int)a;
>
> return b;
> }
>
> and with following command line
>
> gcc -b ppc -mcpu=603e -O3 -S test.c
>
> the result doesn't use floatting point inst.
>
> .L10:
> lwzx 3,31,27
> addi 30,30,1
> lwzx 4,31,28
> addi 31,31,4
> bl __mulsf3 --> jump to __mulsf3 routine
> mr 4,3
> mr 3,29
> bl __addsf3
> cmpwi 0,30,9
> mr 29,3
> bc 4,1,.L10
>
> Anybody kwnow this problem ?
> Any help would be appreciated.
>
> --
> Regards,
>
> Olivier DERVYN
>
> ------------------------------------------------------------------------
>
> Olivier DERVYN <dervyn@digigram.com>
> DIGIGRAM
> Département R&D
>
> Olivier DERVYN
> DIGIGRAM <dervyn@digigram.com>
> Département R&D
> Parc de Pré Milliet ;Montbonnot;;38330;France Fax: 04 76 52 18 44
> Work: 04 76 52 55 01
> DIGIGRAM Parc de Pré Milliet 38330 Montbonnot FRANCE
> Additional Information:
> Last Name DERVYN
> First Name Olivier
> Version 2.1
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