Re: Best mcpu option for amcc440 with fpu ?

[Patrice Bouchand <pb_fwd_list at yahoo dot fr>]

   My program was running faster using mcpu=440 but was not giving the
awaited results (I should add a display sooner...). I was linking a
program build with soft-float setting against libraries using hard-float
setting. 

   Sorry for the noise and thanks for your time.

       Patrice 


Le vendredi 23 fÃvrier 2007 Ã 14:16 +0100, Segher Boessenkool a Ãcrit :
> >    I'm having trouble trying to find the best
> > compiling
> >  option for amcc440 with fpu. I'm using a genuine
> > fedora core 6 ppc distro (gcc4.1.1). It seems that
> > using mcpu=440 gives better results than -mcpu=440fp,
> > even with floating point code ? What could be wrong on
> >
> > my platform to give such a result ?
> 
> Dunno.  You need to hunt down more details first:
> 
> -- Run a profiler (oprofile, gprof) to pinpoint one
> specific (preferably smallish) piece of code that has
> a huge slowdown;
> -- Look at the generated assembler code for that routine
> to see what's up;
> -- Try to figure out why that happened, or report back
> here.
> 
> 
> Segher
>