Index: gcc/mpfr/BUGS |
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-Copyright 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
-Contributed by the Arenaire and Cacao projects, INRIA. |
- |
-This file is part of the GNU MPFR Library. |
- |
-The GNU 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 GNU 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 GNU MPFR Library; see the file COPYING.LIB. If not, write to |
-the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, |
-MA 02110-1301, USA. |
- |
-############################################################################## |
- |
-Probably many bugs. |
- |
-Known bugs: |
- |
-* The overflow/underflow exceptions may be badly handled in some functions; |
- specially when the intermediary internal results have exponent which |
- exceeds the hardware limit (2^30 for a 32 bits CPU, and 2^62 for a 64 bits |
- CPU) or the exact result is close to an overflow/underflow threshold. |
- |
-* Under Linux/x86 with the traditional FPU, some functions do not work |
- if the FPU rounding precision has been changed to single (this is a |
- bad practice and should be useless, but one never knows what other |
- software will do). |
- |
-* Some functions do not use MPFR_SAVE_EXPO_* macros, thus do not behave |
- correctly in a reduced exponent range. |
- |
-* Function hypot gives incorrect result when on the one hand the difference |
- between parameters' exponents is near 2*MPFR_EMAX_MAX and on the other hand |
- the output precision or the precision of the parameter with greatest |
- absolute value is greater than 2*MPFR_EMAX_MAX-4. |
- |
-Potential bugs: |
- |
-* Possible incorrect results due to internal underflow, which can lead to |
- a huge loss of accuracy while the error analysis doesn't take that into |
- account. If the underflow occurs at the last function call (just before |
- the MPFR_CAN_ROUND), the result should be correct (or MPFR gets into an |
- infinite loop). TODO: check the code and the error analysis. |
- |
-* Possible integer overflows on some machines. |
- |
-* Possible bugs with huge precisions (> 2^30). |
- |
-* Possible bugs if the chosen exponent range does not allow to represent |
- the range [1/16, 16]. |
- |
-* 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. However for non-algebraic functions, it is |
- believed that no such case exists, except the well-known cases like cos(0)=1, |
- exp(0)=1, and so on, and the x^y function when y is an integer or y=1/2^k. |
- |
-* The mpfr_set_ld function may be quite slow if the long double type has an |
- exponent of more than 15 bits. |
- |
-* mpfr_set_d may give wrong results on some non-IEEE architectures. |
- |
-* Error analysis for some functions may be incorrect (out-of-date due |
- to modifications in the code?). |
- |
-* Possible use of non-portable feature (pre-C99) of the integer division |
- with negative result. |