[Bug math/13824] exp2l(small_integer) produces rounding errors

[bruno at clisp dot org]

http://sourceware.org/bugzilla/show_bug.cgi?id=13824

--- Comment #2 from Bruno Haible <bruno at clisp dot org> 2012-03-09 01:24:49 UTC ---
(In reply to comment #1)
> a simpler interim fix to the fallback implementation 
> would be to make it separate the integer and fractional parts of the input 
> and only use __ieee754_expl on M_LN2l * (fractional part)

Exactly. That's also the approach used by the portable gnulib implementation of
exp2l:
<http://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=blob;f=lib/exp2l.c;hb=HEAD>

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