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Questions - elementary-functions

What purpose is the lookup table serving in this code?

Below I have adapted code from William Kahan and K.C. Ng (look at the comment block on the bottom) written in 1986 to produce an approximation of 1 / sqrt(x) where x is an IEEE-754 double precision fl...
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Adam Hyland

c

floating-point

pointer-arithmetic

square-root

elementary-functions

Votes: 0

Answers: 1

Latest Answer

xi = *(unsigned long long int*)&x; This reinterprets the bits representing the double x as an unsigned long long, which should be a 64-bit type. This method of reinterpretation is not defined by ...
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Eric Postpischil

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