OpenEuphoria

Re: Implementing the exponential function

• Posted by Alexander Toresson <alexander.toresson at gm?il.?om> Sep 15, 2007
• 521 views

CChris wrote:
> 
> 
> Do all supported C compilers know about double ldexp(double x,int pw2), which
> multiplies a real by a power of 2?
> If not, then exp() can properly be implemented call()ing machine code. But the
> overhead of call() could be an issue.
> 
> power(E,x) is not as acurate as can be, so an alternate form is desirable,
> even
> though this definition is mathematically correct.
> 
> CChris

They should. ldexp() (the variant that takes a double and returns a double) is
standard C89.

Regards, Alexander Toresson