| /* Manipulation of the bit representation of 'long double' quantities. |
| Copyright (C) 1999-2018 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_LDBL_H_ |
| #define _MATH_LDBL_H_ 1 |
| |
| #include <stdint.h> |
| #include <endian.h> |
| |
| /* A union which permits us to convert between a long double and |
| four 32 bit ints or two 64 bit ints. */ |
| |
| #if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
| |
| typedef union |
| { |
| long double value; |
| struct |
| { |
| uint64_t msw; |
| uint64_t lsw; |
| } parts64; |
| struct |
| { |
| uint32_t w0, w1, w2, w3; |
| } parts32; |
| } ieee854_long_double_shape_type; |
| |
| #endif |
| |
| #if __FLOAT_WORD_ORDER == __LITTLE_ENDIAN |
| |
| typedef union |
| { |
| long double value; |
| struct |
| { |
| uint64_t lsw; |
| uint64_t msw; |
| } parts64; |
| struct |
| { |
| uint32_t w3, w2, w1, w0; |
| } parts32; |
| } ieee854_long_double_shape_type; |
| |
| #endif |
| |
| /* Get two 64 bit ints from a long double. */ |
| |
| #define GET_LDOUBLE_WORDS64(ix0,ix1,d) \ |
| do { \ |
| ieee854_long_double_shape_type qw_u; \ |
| qw_u.value = (d); \ |
| (ix0) = qw_u.parts64.msw; \ |
| (ix1) = qw_u.parts64.lsw; \ |
| } while (0) |
| |
| /* Set a long double from two 64 bit ints. */ |
| |
| #define SET_LDOUBLE_WORDS64(d,ix0,ix1) \ |
| do { \ |
| ieee854_long_double_shape_type qw_u; \ |
| qw_u.parts64.msw = (ix0); \ |
| qw_u.parts64.lsw = (ix1); \ |
| (d) = qw_u.value; \ |
| } while (0) |
| |
| /* Get the more significant 64 bits of a long double mantissa. */ |
| |
| #define GET_LDOUBLE_MSW64(v,d) \ |
| do { \ |
| ieee854_long_double_shape_type sh_u; \ |
| sh_u.value = (d); \ |
| (v) = sh_u.parts64.msw; \ |
| } while (0) |
| |
| /* Set the more significant 64 bits of a long double mantissa from an int. */ |
| |
| #define SET_LDOUBLE_MSW64(d,v) \ |
| do { \ |
| ieee854_long_double_shape_type sh_u; \ |
| sh_u.value = (d); \ |
| sh_u.parts64.msw = (v); \ |
| (d) = sh_u.value; \ |
| } while (0) |
| |
| /* Get the least significant 64 bits of a long double mantissa. */ |
| |
| #define GET_LDOUBLE_LSW64(v,d) \ |
| do { \ |
| ieee854_long_double_shape_type sh_u; \ |
| sh_u.value = (d); \ |
| (v) = sh_u.parts64.lsw; \ |
| } while (0) |
| |
| /* |
| On a platform already supporting a binary128 long double, |
| _Float128 will alias to long double. This transformation |
| makes aliasing *l functions to *f128 trivial. |
| */ |
| #define _Float128 long double |
| #define L(x) x##L |
| |
| #endif /* math_ldbl.h */ |