Register Cache.

[Andrew Cagney]

Steven Johnson wrote:

> I have gotten around the issues by invalidating the register cache
> between writes. This is obviously sub-optimal but it works OK.

Very sub-optimal.  Being able to blat register_valid[] is going away :-)

> A better implementation would be to allow a setting on a register by
> register basis that sets how it will be cached by reg-cache.  At the
> time of the original post, this was a fairly major undertaking.
> Regcache currently seems to be undergoing changes that will make
> implementing this easier but for the moment flushing works fine.

I hope it helps.

	Andrew