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Politics : Formerly About Advanced Micro Devices

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To: Tenchusatsu who wrote (61017)	6/8/1999 7:10:00 PM
From: fyo	Read Replies (2) of 1573901

Tench: With AMD banking their hopes on a killer K7 FPU, I wonder how useful 3DNow! would be on K7. That's a very good question. However, the K7 has zero overhead when switching to (and from) 3DNow!, as opposed to the K6-2 which had a substantial overhead (can't remember the exact latency, sorry). The latencies of several of the operations have been significantly improved. A matrix-x-vector transform loop takes about 20 cycles on the K6-2 (3DNow!), 18 on the PIII (SSE) and 14 on the K7 (3DNow!). Note that this is according to AMD, so take it with a grain of salt if you will. Anyway, my point is that there seem to be some 'tweaks' of 3DNow! in the K7. Supposedly, there is also an extra instruction or two... --fyodor

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