Re: [RFC PATCH 0/3] target/ppc: Change CR registers from i32 to tl

[Richard Henderson]

On 9/12/23 17:58, Nicholas Piggin wrote:
> This is a bit of churn so I might leave it for later in the cycle (or
> defer if we get a lot of other changes) since it's a relatively
> mechanical change. So don't spend time reviewing details, I'm just
> wondering about concept and general approach.
>
> I'm not sure the history of why these are 32-bit, maybe better code gen
> on 32-bit host emulating 64-bit? If so, that shouldn't be so important
> now that most people use 64-bit systems to develop and test with.

It was probably in order to save space, but I have no specific knowledge.

What does this do to the generated code?  I suspect, without looking, that it doesn't 
change things much at all on e.g. a ppc64 host, and for an x86_64 host merely changes the 
types of some instructions (which, considering the rex64 encoding, might consume a few 
more bytes).


r~