Re: FP aliases

["Svein E. Seldal" <Svein.Seldal@solidas.com>]

Andrew Cagney wrote:
> If your architecture does not have a $fp, do not try to provide it.  GDB 
> will map $fp onto the frame's base address (as defined by the debug info).

<snip>
> Only include $fp in the register names when there is a register, as 
> defined by the ISA, that has the name "fp".
> 
> The d10v doesn't have a register called FP, so doesn't provide "fp". 
> Instead, $fp is mapped onto the frame's base address.

Well, the trick is that tic4x-gcc assigns ar3 as an fp register (at all 
times), so you wind up stuck in the middle here. You have an FP-like 
register, yet it's not named FP.

But I've rough-ported the d10v unwind mechanisms to the tic4x port, and 
it seems like I am able to work it out without the fp register. (Still, 
I need to understand those unwind things..)

> Yes.  An architecture function is deprecated when either: it isn't 
> needed at all (as with FP_REGNUM, READ_FP); or has been made redundant 
> by a newer mechanism.

Yes, and its these new mechanisms I'm trying to work out. I'll take a 
look at the i386 port, and see if I'm able to resolve its functionality 
from that.


Svein