Appeal No. 2004-0115 Page 5
Application No. 09/363,637
1. CLAIM CONSTRUCTION
"Analysis begins with a key legal question -- what is the invention claimed?"
Panduit Corp. v. Dennison Mfg. Co., 810 F.2d 1561, 1567, 1 USPQ2d 1593, 1597 (Fed.
Cir. 1987). Here, claim 17 recites in pertinent part the following limitations: "estimating
the reciprocal square root of the number to produce an estimate (Xi); . . . multiplying
said estimate by the number to produce a first intermediate result (IR1); . . . determining
a second intermediate result (IR2) according to the equation: IR2=(1-Xi*IR1)/2; . . .
multiplying said second intermediate result by said estimate to produce a third
intermediate result; and . . . adding said third intermediate result to said estimate to
produce an approximation of the reciprocal square root of the number." Claim 22
recites in pertinent part the following limitations: "providing an estimate instruction to the
floating-point unit that enables the floating-point unit to produce an estimate (Xi) of the
reciprocal square root of the number; . . . providing a multiply instruction to the floating-
point unit that enables the floating-point unit to produce a first intermediate result (IR1)
equal to said estimate multiplied by said number; . . . providing an instruction to said
floating-point unit that enables the floating-point unit to produce a first intermediate
result (IR1) according to the equation: IR2 = (1 - Xi*IR1)/2; and . . . providing a multiply-
add instruction to said floating-point unit that enables the floating-point unit to produce
an approximation (Xi) of the reciprocal square root of the number according to the
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