Advanced Micro Devices - Moderated (AMD) Message Board

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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 213.43

+6.2%

Dec 19 9:30 AM EST

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To: DRBES who wrote (2838)	7/29/2000 9:27:56 AM
From: Scumbria	Read Replies (1) of 275872

DARBES, its very deep, 20 stage, pipeline may be a programmer's nightmare since it obligates timing of calculation parallels to nightmare proportions. There are very simple dataflow algorithms in use which make the problem of forwarding data in a deep pipeline manageable. Basically, each renamed result register is given a tag, which is snooped by the rest of the pipe as a potential operand source. Most x86 operands come from memory rather than the register file, so a similar snooping scheme is required between the store queue and the cache. It would be difficult to manage the state of a deep pipe through old fashioned centralized control, but dataflow techniques make deep pipelines quite manageable. Scumbria

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