Copyright 1999, 2001, 2002, 2003, 2004 Free Software Foundation.
Contributed by the Spaces project, INRIA Lorraine.

This file is part of the MPFR Library.

The MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.

The MPFR Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with the MPFR Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA.

##############################################################################

Probably many bugs.

Known bugs:

* The overflows/underflows are partially implemented in some functions.
  For instance, mpfr_pow (z, x, y, rnd) fails for very small x and some
  values of y.

* The mpfr_set_ld function assumes that the long double type has an
  exponent of at most 15 bits.

* When MPFR is compiled with Visual C++ under MS Windows, some tests may
  fail, because of the way special IEEE-754 double values are tested.

Potential bugs:

* Possible integer overflows on some machines. Some types are used
  inconsistently.

* Possible infinite loop in some functions for particular cases: when
  the exact result is an exactly representable number or the middle of
  consecutive two such numbers.

* mpfr_set_d may give wrong results on some architectures.

* Error analysis for some functions may be incorrect (out-of-date due
  to modifications in the code?).

* mpfr_hypot may fail for x very large, y very small and a very large
  target precision. Other functions may be affected by similar problems.

Problems due to compiler bugs:

* on some architectures (for example alpha-dec-osf), gcc 3.3 wrongly
  compares "long double" floating-point numbers, with optimization level
  1 or higher. This bug can be detected by the following program:

  #include <stdio.h>
  #include <stdlib.h>
  #include <float.h>
  int
  main ()
  {
    long double d;
    d = 1.0; while (d < LDBL_MAX / 2.0) d += d;
    if (d == (long double) 0.0)
      printf ("d equals 0.0\n");
  }

  This results in a problem in the mpfr_set_ld function. A workaround is
  to compile set_ld.c with -O0 (no optimization).