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From: | Anthony Liguori |
Subject: | Re: [Qemu-devel] [PATCH] Enabled building of x86_64 code on Mac OS X |
Date: | Mon, 26 Jan 2009 19:22:38 -0600 |
User-agent: | Thunderbird 2.0.0.19 (X11/20090105) |
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
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