[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 #3 from ghazi at gcc dot gnu dot org  2006-10-06 13:25 -------
(In reply to comment #2)
> (In reply to comment #0)
> > 
> > 1.  Whether a certain minimum version of GMP/MPFR is required to avoid known
> > bugs, etc.
> See my recent patch to toplevel configure.in.  THe minimum required 
> versions should be gmp-4.1.x and mpfr-2.2.0.

I see that, but when configure detects the "broken" mpfr, it just prints out a
message and proceeds happily.  It doesn't disable anything. (???)

> If you haven't read fortran/{arith.c,simplify.c}, then I'd suggest
> that you take a look to see what gmp/mpfr can do.

I looked through those and read through the mpfr docs so I think I have a good
idea of what mpfr can do.  My main area of concern right now is converting
between gcc's REAL_VALUE_TYPE and mpfr_t.  I found gfc_conv_mpfr_to_tree() in
trans-const.c which uses a string as an intermediate type, is that the most
efficient way to convert?  Also where is the function that does the reverse,
i.e. tree or REAL_VALUE_TYPE to mpfr_t?


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