| /* Manipulation of the bit representation of 'long double' quantities. |
| Copyright (C) 2001-2018 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> |
| |
| /* A union which permits us to convert between a long double and |
| three 32 bit ints. */ |
| |
| typedef union |
| { |
| long double value; |
| struct |
| { |
| uint32_t lsw; |
| uint32_t msw; |
| int sign_exponent:16; |
| unsigned int empty1:16; |
| unsigned int empty0:32; |
| } parts; |
| } ieee_long_double_shape_type; |
| |
| /* Get three 32 bit ints from a double. */ |
| |
| #define GET_LDOUBLE_WORDS(exp,ix0,ix1,d) \ |
| do { \ |
| ieee_long_double_shape_type ew_u; \ |
| ew_u.value = (d); \ |
| (exp) = ew_u.parts.sign_exponent; \ |
| (ix0) = ew_u.parts.msw; \ |
| (ix1) = ew_u.parts.lsw; \ |
| } while (0) |
| |
| /* Set a double from two 32 bit ints. */ |
| |
| #define SET_LDOUBLE_WORDS(d,exp,ix0,ix1) \ |
| do { \ |
| ieee_long_double_shape_type iw_u; \ |
| iw_u.parts.sign_exponent = (exp); \ |
| iw_u.parts.msw = (ix0); \ |
| iw_u.parts.lsw = (ix1); \ |
| (d) = iw_u.value; \ |
| } while (0) |
| |
| /* Get the more significant 32 bits of a long double mantissa. */ |
| |
| #define GET_LDOUBLE_MSW(v,d) \ |
| do { \ |
| ieee_long_double_shape_type sh_u; \ |
| sh_u.value = (d); \ |
| (v) = sh_u.parts.msw; \ |
| } while (0) |
| |
| /* Set the more significant 32 bits of a long double mantissa from an int. */ |
| |
| #define SET_LDOUBLE_MSW(d,v) \ |
| do { \ |
| ieee_long_double_shape_type sh_u; \ |
| sh_u.value = (d); \ |
| sh_u.parts.msw = (v); \ |
| (d) = sh_u.value; \ |
| } while (0) |
| |
| /* Get int from the exponent of a long double. */ |
| |
| #define GET_LDOUBLE_EXP(exp,d) \ |
| do { \ |
| ieee_long_double_shape_type ge_u; \ |
| ge_u.value = (d); \ |
| (exp) = ge_u.parts.sign_exponent; \ |
| } while (0) |
| |
| /* Set exponent of a long double from an int. */ |
| |
| #define SET_LDOUBLE_EXP(d,exp) \ |
| do { \ |
| ieee_long_double_shape_type se_u; \ |
| se_u.value = (d); \ |
| se_u.parts.sign_exponent = (exp); \ |
| (d) = se_u.value; \ |
| } while (0) |
| |
| #endif /* math_ldbl.h */ |