Re: [Qemu-devel] [PATCH] Enabled building of x86_64 code on Mac OS X

[Anthony Liguori <aliguori@us.ibm.com>]

Paul Brook wrote:
> I did say overall performance.
> My experience with AMD hardware is that you generally get ~10% overall 
> improvement from LP64. Intel hardware (particularly the early 64-bit cores) 
> less so, but it's generally still a win.
>
> I guess ILP32 long mode would probably increase that further, and avoid the 
> odd regressions. It's an awful lot of work to implement though, especially on 
> a target that isn't used to having lots of incompatible variants.
>   

I expected a performance boost.  Since OS X only runs on Intel CPUs, I 
don't think it's dramatically worth it to get a few percent CPU 
improvement.  The reason I asked is that if we decided to drop Cocoa in 
favor of SDL, it would prevent the use of 64-bit.

However, as long as someone is willing to fix Cocoa, I don't think 
there's any harm keeping it around so it doesn't matter that much.

Regards,

Anthony Liguori

> Paul
>
>