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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libfortran/59836] [4.7/4.8/4.9 Regression] Wrong outputs with rounding formats for some values.
Date: Sat, 18 Jan 2014 16:46:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59836

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jb at gcc dot gnu.org

--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The line

  if (w > 0 && d == 0 && p == 0)

has been introduced at r173408 and obviously the first code in comment 0 has
started to give the wrong output after it.

The second code in comment 0 has started to give the wrong output after r185433
(so far I did not try to understand why).

Note that the block

   if (nbefore + nafter == 0)
     {
       ndigits = 0;
       if (nzero_real == d && digits[0] >= rchar)
     {
       /* We rounded to zero but shouldn't have */
      nzero--;
      nafter = 1;
       digits[0] = '1';
       ndigits = 1;
     }

is present in the first version of libgfortran/io/write_float.def (r128114)
with char replaced with '5' (the change was introduced at r152263).