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From: "danglin at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/33595] FAIL: gfortran.dg/nint_2.f90  -O0  execution test
Date: Sun, 28 Dec 2008 20:26:00 -0000	[thread overview]
Message-ID: <20081228202517.13112.qmail@sourceware.org> (raw)
In-Reply-To: <bug-33595-276@http.gcc.gnu.org/bugzilla/>



------- Comment #8 from danglin at gcc dot gnu dot org  2008-12-28 20:25 -------
The value calculated for b = nearest(0.5,-1.0) is 0.49999997 (raw 0x3effffff).
The code uses the roundf implementation in c99_functions.

float
roundf(float x)
{
   float t;
   if (!isfinite (x))
     return (x);

   if (x >= 0.0) 
    {
      t = ceilf(x);
      if (t - x > 0.5)
        t -= 1.0;
      return (t);
    } 
   else 
    {
      t = ceilf(-x);
      if (t + x > 0.5)
        t -= 1.0;
      return (-t);
    }
}

The call to ceilf returns t = 1 (raw 0x3f800000).  The result of t - x
is 0.5 (raw 0x3f000000).  So, roundf returns 1 and the test fails.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33595


  parent reply	other threads:[~2008-12-28 20:26 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-09-29 21:27 [Bug fortran/33595] New: " danglin at gcc dot gnu dot org
2007-10-01 13:13 ` [Bug fortran/33595] " fxcoudert at gcc dot gnu dot org
2007-10-01 16:33 ` dave at hiauly1 dot hia dot nrc dot ca
2007-10-01 16:39 ` fxcoudert at gcc dot gnu dot org
2007-10-01 17:29 ` dave at hiauly1 dot hia dot nrc dot ca
2007-12-22  7:38 ` jvdelisle at gcc dot gnu dot org
2008-12-04  3:05 ` billingd at gcc dot gnu dot org
2008-12-04  5:13 ` billingd at gcc dot gnu dot org
2008-12-28 20:26 ` danglin at gcc dot gnu dot org [this message]
2008-12-28 20:41 ` dave at hiauly1 dot hia dot nrc dot ca
2008-12-28 20:47 ` danglin at gcc dot gnu dot org
2008-12-28 21:03 ` kargl at gcc dot gnu dot org
2008-12-28 21:50 ` dave at hiauly1 dot hia dot nrc dot ca
2008-12-28 22:16 ` kargl at gcc dot gnu dot org
2008-12-29 17:12 ` danglin at gcc dot gnu dot org
2009-03-28  9:41 ` fxcoudert at gcc dot gnu dot org
2009-03-28 21:16 ` danglin at gcc dot gnu dot org
2009-03-29  7:36 ` [Bug libfortran/33595] " fxcoudert at gcc dot gnu dot org

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