Article: CELL Microprocessor III
By: Deadmeat (deadmeatoa.delete@this.yahoo.com), August 7, 2005 3:39 pm
Room: Moderated Discussions
>I've since received two negative feedbacks on the "DD2 PPE has Gekko" speculation
>from people who *should* know. So I'm now back to square one. The flops are mysterious
>once again with no explanation as to how to account for the last 4 flops per cycle.
Since DD2 has a maximum instruction issue rate of 2 per cycle, one has to be an Altivec FMAC and the other has to be "Gekko" FMAC to reach 12 FLOPS per cycle.
If DD2 was a tri-issue, then 1 Altivec + 2 FMAC instructions might make sense, but it isn't here.
>from people who *should* know. So I'm now back to square one. The flops are mysterious
>once again with no explanation as to how to account for the last 4 flops per cycle.
Since DD2 has a maximum instruction issue rate of 2 per cycle, one has to be an Altivec FMAC and the other has to be "Gekko" FMAC to reach 12 FLOPS per cycle.
If DD2 was a tri-issue, then 1 Altivec + 2 FMAC instructions might make sense, but it isn't here.
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