XCHG is slow ?

John Rose john.r.rose at oracle.com
Tue Jul 3 16:29:50 PDT 2012


On Jul 3, 2012, at 4:26 PM, John Rose wrote:

> Isn't "dec %esi" really a REX prefix? — John

No, not if it's two bytes.

Pretty strange.  I don't think our nop-generator produces xchg.

— John
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