Re: Is this the expected behavior?

[Paolo Bonzini <bonzini at gnu dot org>]

Mohamed Shafi wrote:
> 2008/7/15 Ramana Radhakrishnan <ramana.r@gmail.com>:
> > <snipped parts of the last mail>
> >
> > >   I agree with you, but what about when there are still caller save
> > > register are available and there are no register restrictions for any
> > > instructions? In my case i find that GCC has used only the argument
> > > registers, stack pointer and callee saved registers. So out of the 16
> > > available registers ony 5+1+4 registers were used, even though there
> > > was 6 caller save registers were available
> >
> > Check your REG_ALLOC_ORDER macro ?
>
>   The order is argument registers, caller save registers and finally
> the callee save registers.

Are there instructions that only work on the callee-save registers? 
This might confuse regclass (the pass that decides the register class 
preferences).

Paolo