New CELL Article Online

Article: CELL Microprocessor III
By: David Wang (dwang.delete@this.reRWTexpanded.com), August 10, 2005 10:06 am
Room: Moderated Discussions
Aaron Spink (aaronspink@earthlink.net) on 8/9/05 wrote:
---------------------------
>David Wang (dwang@RWTexpanded.com) on 8/8/05 wrote:
>---------------------------
>
>>Well, if indeed Gekko had been added to DD2 PPE for Nintendo, neither Sony nor
>>MS has to do anything to "take advantage of it". It could simply exist to enables
>>a "12 FLOPS per cycle" claim. Whether Sony or MS actually "takes advantage" of such an FPU is another story.
>>
>Hmm, I'm supprised no one has picked up on the possibility of tree ops?
>
>Tree_Op(V1,V2,V3) = (V11*V21+V31) + (V12*V22+V32) + (V13*V23+V33) + (V14*V24+V34)
>
>A 4 input vector tree op will give you 11 flops with another 1 flop for the FPU
>thats 12. Tree ops are the generallized form of a dot product which we know that Xenon supports.

Thanks. Very interesting theory. I'll see if I can find out if this is the explanation for the 12 flop claim that is proving to be difficult to account for. I like the fact that this theory implies a fused scalar/vector FPU so that the multipler array can't be used by the scalar FPU to generate a 2 flop fmac independently. Otherwise the total count would be 13 flops per cycle rather than 12.

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