Processor having efficient function estimate instructions

Details Processor having efficient function estimate instructions Processor having efficient function estimate instructions

2008-07-29

2008-07-29

Chan, Eddie P (Department: 2183)

Electrical computers and digital processing systems: processing

Processing control

Arithmetic operation instruction processing

C708S495000, C708S508000, C708S500000, C708S502000

Reexamination Certificate

active

11127848

ABSTRACT:
High-precision floating-point function estimates are split in two instructions each: a low precision table lookup instruction and a linear interpolation instruction. Estimates of different functions can be implemented using this scheme: A separate table-lookup instruction is provided for each different function, while only a single interpolation instruction is needed, since the single interpolation instruction can perform the interpolation step for any of the functions to be estimated. Thus, significantly less overhead is incurred than would be incurred with specialized hardware, while still maintaining a uniform FPU latency, which allows for much simpler control logic.

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