Re: [RFA][2/5] New port: Cell BE SPU (valops.c fix)

[Daniel Jacobowitz <drow@false.org>]

On Wed, Dec 06, 2006 at 06:10:04PM +0100, Ulrich Weigand wrote:
> Daniel Jacobowitz wrote:
> 
> > Vladimir has actually been working on a similar change for a different
> > purpose.  He added a "parent value" pointer to values; bitfields then
> > are accessed by reading the enclosing structure and extracting bits
> > from value_contents.
> 
> Can you point me to the patch?  I didn't find it on the gdb-patches list ...

It hasn't been posted yet - it's not quite done.

> > What do you think?  Would this solve the same problem as your patch?
> 
> Depending on the circumstances when a "child" value is generated, it
> may solve the same problem.  To solve the register value problem,
> we would need to make sure that accessing a component of a value in
> a register would create a "child" value, and v_t_r is always only 
> ever called on the (grand-)parent that corresponds to the value
> originally retrieved by r_t_v.

Right.  The current version only did this for bitfields in memory,
rather than fields in registers, but it shouldn't be hard to extend.
Does that make sense, Vlad?

-- 
Daniel Jacobowitz
CodeSourcery