diff options
Diffstat (limited to 'bits/flt-eval-method.h')
| -rw-r--r-- | bits/flt-eval-method.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/bits/flt-eval-method.h b/bits/flt-eval-method.h new file mode 100644 index 0000000..8ecd6a6 --- /dev/null +++ b/bits/flt-eval-method.h @@ -0,0 +1,42 @@ +/* Define __GLIBC_FLT_EVAL_METHOD. + Copyright (C) 2016 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C 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 C 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 C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _MATH_H +# error "Never use <bits/flt-eval-method.h> directly; include <math.h> instead." +#endif + +/* __GLIBC_FLT_EVAL_METHOD is the value of FLT_EVAL_METHOD used to + determine the evaluation method typedefs such as float_t and + double_t. It must be a value from C11 or TS 18661-3:2015, and not + -1. */ + +/* In the default version of this header, follow __FLT_EVAL_METHOD__. + -1 is mapped to 2 (considering evaluation as long double to be a + conservatively safe assumption), and if __FLT_EVAL_METHOD__ is not + defined then assume there is no excess precision and use the value + 0. */ + +#ifdef __FLT_EVAL_METHOD__ +# if __FLT_EVAL_METHOD__ == -1 +# define __GLIBC_FLT_EVAL_METHOD 2 +# else +# define __GLIBC_FLT_EVAL_METHOD __FLT_EVAL_METHOD__ +# endif +#else +# define __GLIBC_FLT_EVAL_METHOD 0 +#endif |