| /* Macros for not-a-number. |
| Copyright (C) 2007-2020 Free Software Foundation, Inc. |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program 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 General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| |
| |
| /* IBM z/OS supports both hexadecimal and IEEE floating-point formats. The |
| former does not support NaN and its isnan() implementation returns zero |
| for all values. */ |
| #if defined __MVS__ && defined __IBMC__ && !defined __BFP__ |
| # error "NaN is not supported with IBM's hexadecimal floating-point format; please re-compile with -qfloat=ieee" |
| #endif |
| |
| /* NaNf () returns a 'float' not-a-number. */ |
| |
| /* The Compaq (ex-DEC) C 6.4 compiler and the Microsoft MSVC 9 compiler choke |
| on the expression 0.0 / 0.0. The IBM XL C compiler on z/OS complains. |
| PGI 16.10 complains. */ |
| #if (defined __DECC || defined _MSC_VER \ |
| || (defined __MVS__ && defined __IBMC__) \ |
| || defined __PGI) |
| static float |
| NaNf () |
| { |
| static float zero = 0.0f; |
| return zero / zero; |
| } |
| #else |
| # define NaNf() (0.0f / 0.0f) |
| #endif |
| |
| |
| /* NaNd () returns a 'double' not-a-number. */ |
| |
| /* The Compaq (ex-DEC) C 6.4 compiler and the Microsoft MSVC 9 compiler choke |
| on the expression 0.0 / 0.0. The IBM XL C compiler on z/OS complains. |
| PGI 16.10 complains. */ |
| #if (defined __DECC || defined _MSC_VER \ |
| || (defined __MVS__ && defined __IBMC__) \ |
| || defined __PGI) |
| static double |
| NaNd () |
| { |
| static double zero = 0.0; |
| return zero / zero; |
| } |
| #else |
| # define NaNd() (0.0 / 0.0) |
| #endif |
| |
| |
| /* NaNl () returns a 'long double' not-a-number. */ |
| |
| /* On Irix 6.5, gcc 3.4.3 can't compute compile-time NaN, and needs the |
| runtime type conversion. |
| The Microsoft MSVC 9 compiler chokes on the expression 0.0L / 0.0L. |
| The IBM XL C compiler on z/OS complains. |
| PGI 16.10 complains. */ |
| #ifdef __sgi |
| static long double NaNl () |
| { |
| double zero = 0.0; |
| return zero / zero; |
| } |
| #elif defined _MSC_VER || (defined __MVS__ && defined __IBMC__) || defined __PGI |
| static long double |
| NaNl () |
| { |
| static long double zero = 0.0L; |
| return zero / zero; |
| } |
| #else |
| # define NaNl() (0.0L / 0.0L) |
| #endif |