PATCH 1: Re: BOOTSTRAP FAILURE: segementation fault in genattrtab

[Bernd Schmidt]

Jeff Law wrote:
> > It seems to me that we should return the hard frame pointer if it is
> > being used that way.  Else we should not.
> >
> > ie, if we did not eliminate the frame pointer, then returning frame_pointer_rtx
> > would be the right thing to do.
> >
> > If we did eliminate the frame pointer, then we do not want to return
> > frame_pointer_rtx.

On Tue, 21 Nov 2000, John David Anglin wrote:
> Is there a simple test to determine whether the frame pointer or other
> eliminable register has been eliminated?

frame_pointer_needed might do it.

> When I wrote the patch, I assumed
> that no code would call gen_rtx_REG if it needed the frame_pointer_rtx
> after reload even if it hadn't been eliminated.

I believe this assumption is correct.  If you want the frame pointer register,
you should be using frame_pointer_rtx rather than calling gen_rtx_REG.  The
code in gen_rtx_REG is simply a workaround for the insn-emit.c.


Bernd