Re: [Qemu-ppc] VSX registers definition question

[Alexander Graf]

On 28.08.2013, at 15:59, Jacques Mony wrote:

> Hello,
> 
> That's my understanding.
> 
> However, I am wondering what the best approach is from the following 2 (or 
> any other?):
> 
>       - Access GP registers array for lower 64 bits and vsr for higher 64 
> bits, for the first 32 registers and then use the 32 VR registers for the 
> second block of VSX registers (It makes sense but adds a layer of logic on 
> all instructions (slighly less efficient?). But it would limit the impacts on 
> the rest of the code, which of course is non-negligible.)

The largest register size we have in TCG is 64bit, so I don't think there'd be 
such a big impact here really.

>       - Modify the arrays to have a 64 range of 128 bits registers and modify 
> all the existing addressing in existing opcodes (Honestly, don't like it)

Yeah, I'd rather not have to touch all the existing opcodes :).

Also, could you please reply in-line next time? It makes it a lot easier to 
track what's going on :). Looking very much forward to VSX patches!


Alex