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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/57994] Constant folding of infinity
Date: Sat, 27 Jul 2013 00:15:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57994

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-07-27
                 CC|                            |ghazi at gcc dot gnu.org,
                   |                            |jsm28 at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Oh nice. And if I disable by hand the real_isfinite (ra) check in do_mpfr_arg1
I even get 0. And I also checked what happens for sin(Inf) in that case: a -nan
as before the hack.

Then which is at this point a safe way to proceed? Get in touch with the mpfr
people, ask if simplifying infinities has known issues? Tentatively remove the
real_isfinite checks from one of the do_mpfr_arg? functions at a time, or even
one mathematical function at a time?