Re: Multiplexed registers and invalidating the register cache

Andrew Cagney
2004-04-14T16:01:16Z

> I think you should make this change unconditionally - and flush the
> entire frame cache. I'm not sure whether it should be in the generic
> code that writes a register or the user-level code triggered by set
> $reg = val, though.
>
> I've been meaning to do this for a long time. For instance, there is a
> writeable register on PowerPC targets which has some read-only bits.
> Right now, if you set it to an arbitrary value and then print it you'll
> get the value GDB wrote - not the value that was actually accepted into
> the register.
>
> Andrew convinced me that the performance cost associated with this
> would be small in practice.

Right.

Andrew