[Bug middle-end/29335] transcendental functions with constant arguments should be resolved at compile-time

["ghazi at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #7 from ghazi at gcc dot gnu dot org  2006-10-07 02:04 -------
(In reply to comment #6)
> > > There is mpfr_get_ld(), which converts to a long double.  If the data type
> > > never exceeds the properties of long double, then one may be able to
> > > use mpfr_get_ld() and then fold_convert() the result to the proper type.
> > 
> > I think using long double defeats the whole purpose of using mpfr.
> It appears you misread what I wrote (or meant to write).  "If the data
> type never exceeds the properties of long double"  applies to a cross
> compiler as well where "data type" is on the target and "long double"
> is on the host.  
> >  We're
> > supposed to avoid relying on the properties of the host's floating point for
> > cross-compilers where the target format is different.
> The host's long double is simply an intermediate representation of the
> value.  It is the responsibility of the fold_convert to get the right
> target representation.  This is no different than using strings as the
> intermediate.

I want the optimization to work always, not just in certain host/target
combinations.  So I'll use strings, no big deal.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29335