Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Reexamination Certificate
2005-02-16
2010-06-29
Do, Chat C (Department: 2193)
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
Reexamination Certificate
active
07747667
ABSTRACT:
A data processing apparatus and method generate an initial estimate of a result value that would be produced by performing a reciprocal operation on an input value. The input value and the result value are either fixed point values or floating point values. The data processing apparatus comprises processing logic for executing instructions to perform data processing operations on data, and a lookup table referenced by the processing logic during generation of the initial estimate of the result value. The processing logic is responsive to an estimate instruction to reference the lookup table to generate, dependent on a modified input value that is within a predetermined range of values, a table output value. For a particular modified input value, the same table output value is generated irrespective of whether the input value is a fixed point value or a floating point value. The initial estimate of the result value is then derivable from the table output value. This provides a particularly efficient technique for performing the initial estimate generation within a data processing apparatus where the reciprocal operation may be performed on either fixed point values or floating point values.
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U.S. Appl. No. 11/058,420, filed Feb. 16, 2004; Inventor: Lutz et al.
Office Action mailed Feb. 27, 2008 in co-pending U.S. Appl. No. 11/058,420.
Office Action mailed Aug. 10, 2009 in co-pending U.S. Appl. No. 11/058,420.
Translation of Japanese official action, Mar. 2, 2010, in corresponding Japanese Application No. 2005-341816.
Ford Simon Andrew
Hinds Christopher Neal
Lutz David Raymond
Symes Dominic Hugo
ARM Limited
Do Chat C
Nixon & Vanderhye P.C.
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