Re: fast pow() for limited inputs

On Wed, Aug 18, 2010 at 11:35 PM, Fabian Giesen <[email protected]> wrote:
>
>> I would also love to just see a sample implementation of pow(), log(),
>> and exp() somewhere, even that might be helpful.
>
> glibc math implementations are in sysdeps/ieee754 for generic IEEE-754
> compliant platforms, with optimized versions for all relevant
> architectures in sysdeps/<arch>. If you really want to know how it's
> implemented :)


What he said.

Also, take a look at the CEPHES library for platform agnostic
reference implementations of the C math functions and some extras like
cotangent, cuberoot and integer powers:

    http://www.netlib.org/cephes/

And here's an X86 specific implementation of powf() that claims to be
faster (than what, it doesn't say):

   http://www.xyzw.de/c190.html

- Robin Green.

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