P6 Binary Floating-Point Unit

Provided by: IBM
Topic: Hardware
Format: PDF
The floating point unit of the next generation PowerPC is detailed. It has been tested at over 5 GHz. The design supports an extremely aggressive cycle time of 13 FO4 using a technology independent measure. For most dependent instructions, its fused multiply-add dataflow has only 6 effective pipeline stages. This is nearly equivalent to its predecessor, the Power 5, even though its technology independent frequency has increased over 70%. Overall the frequency has improved over 100%. It achieves this high performance through aggressive feedback paths, circuit design and layout.

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