On 23 Jan 2005, at 03:39, Andi Kleen wrote:
Felipe Alfaro Solana <[EMAIL PROTECTED]> writes:
AFAIK, XOR is quite expensive on IA32 when compared to simple MOV operatings. Also, since the original patch uses 3 MOVs to perform the swapping, and your version uses 3 XOR operations, I don't see any gains.
Both are one cycle latency for register<->register on all x86 cores I've looked at. What makes you think differently?
I thought XOR was more expensie. Anyways, I still don't see any advantage in replacing 3 MOVs with 3 XORs.
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