Re: [PATCH 12/29] x86, tsx: Add a per thread transaction disablecount
From: Borislav Petkov
Date: Sat Mar 23 2013 - 12:26:11 EST
On Sat, Mar 23, 2013 at 04:52:56PM +0100, Borislav Petkov wrote:
> And wow, the XOR is *actually* faster. That's whopping three cycles on
> AMD. Similar observation on SNB.
Ok, correction: I was looking at the wrong row in the table. The XOR
version with an immediate and mem access is actually as fast as the
INC/DEC mem versions: 4 cycles on AMD F10h and 6 on SNB, according to
the docs. I should've realized that there's still a mem access there...
Anyway, the rest stands.
Sent from a fat crate under my desk. Formatting is fine.
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