[PATCH] add Kconfig option for optimizing for cell

[Arnd Bergmann]

On Saturday 15 September 2007, Segher Boessenkool wrote:
> 
> > +config TUNE_CELL
> > +     bool "Optimize for Cell Broadband Engine"
> > +     depends on PPC64
> > +     help
> > +       Cause the compiler to optimize for the PPE of the Cell Broadband
> > +       Engine. This will make the code run considerably faster on Cell
> > +       but somewhat slower on other machines. This option only changes
> > +       the scheduling of instructions, not the selection of instructions
> > +       itself,
> 
> It _does_ change instruction selection, which is the main factor
> in the slowdown on other machines (and a big part of the speedup
> on Cell, too).  It doesn't change which insns the compiler is
> allowed to use though, which is probably what you wanted to say?

Right, thanks for the correction.

	Arnd <><