Re: [Algorithms] (no subject)

[Dave E. <eb...@ma...>]

From: "Matthew Davies" <MD...@ac...>
> I have assembly code versions of sine, cosine and tangent functions but
now
> I need arcsine, arccosine and arctangent functions, some of which are
needed
> in my quaternion code.  Can anyone provide references to how these can be
> implemented on the Pentium processor using the FPU?

http://www.magic-software.com/MgcNumerics.html , files
MgcFastFunction.{h,cpp}
The code includes polynomial approximations for sin, cos, tan, atan, a
couple of other approximations for atan, and approximations for asin and
acos that involve polynomials multiplied by sqrt(1-x) for 0 <= x <= 1.  This
code alone ran 2.5 times faster than using calls to asin/acos, but it should
be easy enough for you to swap out sqrt for your own Pentium-specific fast
square root calculator.

--
Dave Eberly
eb...@ma...
http://www.magic-software.com