From: "Kaveh R. GHAZI" <ghazi@caip.rutgers.edu>
To: Vincent Lefevre <vincent+gcc@vinc17.org>
Cc: gcc@gcc.gnu.org
Subject: Re: MPFR 2.3.1 Release Candidate
Date: Fri, 04 Jan 2008 02:54:00 -0000 [thread overview]
Message-ID: <Pine.GSO.4.58.0801032142560.27069@caipclassic.rutgers.edu> (raw)
In-Reply-To: <20080102120837.GG1096@prunille.vinc17.org>
On Wed, 2 Jan 2008, Vincent Lefevre wrote:
> See the new bug fixed in r5162 (for the 2.3 branch). mpfr_gamma on
> -1000000001.5 will give you -0 instead of +0.
So I tried that, but mpfr_gamma on that value sets the global underflow
flag. If overflow/underflow are set by mpfr, GCC will intentionally
bypass folding. So this particular case is not something I can use.
I don't know if this mpfr case should be setting the underflow flag or if
it's a bug. Calling the glibc tgamma doesn't seem to think it underflowed
when looking at fetestexcept().
--Kaveh
--
Kaveh R. Ghazi ghazi@caip.rutgers.edu
next prev parent reply other threads:[~2008-01-04 2:54 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-29 20:07 Vincent Lefevre
2007-12-29 20:10 ` Dennis Clarke
2007-12-29 20:14 ` Dave Korn
2007-12-29 22:01 ` Dennis Clarke
2007-12-29 23:03 ` Vincent Lefevre
2008-01-01 5:17 ` Vincent Lefevre
2007-12-31 22:44 ` Kaveh R. GHAZI
2008-01-01 5:08 ` Vincent Lefevre
2008-01-02 6:07 ` Kaveh R. GHAZI
2008-01-02 12:13 ` Vincent Lefevre
2008-01-04 2:54 ` Kaveh R. GHAZI [this message]
2008-01-04 8:06 ` Vincent Lefevre
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