Advanced Micro Devices - Moderated (AMD) Message Board

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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 202.95

-16.2%

12:03 PM EST

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To: Joe NYC who wrote (19739)	11/20/2000 3:03:23 AM
From: jcholewa	Read Replies (3) of 275872

> Look at the last test - RC5. Athlon beats P4 better than 2:1 Yeah, and I could tell you why. rc5 depends solely on one instruction: ROL, or ROTL for you general ISA buffs. That's bitwise ROtate Left. Athlon can do three of these instructions per cycle, and the instruction itself takes one or two cycles (I forget) to complete. P4 can do one per cycle, and each instruction takes a mammoth 4 (or was it 6? I'm pretty sure it was 4) cycles to complete. Still, if rc5 didn't exist, this deficiency would be unimportant, as ROL is used by hardly any program out there.     -JC

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