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| 1 | /* Manipulation of the bit representation of 'long double' quantities. |
|---|---|
| 2 | Copyright (C) 1999-2022 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #ifndef _MATH_LDBL_H_ |
| 20 | #define _MATH_LDBL_H_ 1 |
| 21 | |
| 22 | #include <stdint.h> |
| 23 | #include <endian.h> |
| 24 | |
| 25 | /* A union which permits us to convert between a long double and |
| 26 | three 32 bit ints. */ |
| 27 | |
| 28 | #if __FLOAT_WORD_ORDER == __BIG_ENDIAN |
| 29 | |
| 30 | typedef union |
| 31 | { |
| 32 | long double value; |
| 33 | struct |
| 34 | { |
| 35 | int sign_exponent:16; |
| 36 | unsigned int empty:16; |
| 37 | uint32_t msw; |
| 38 | uint32_t lsw; |
| 39 | } parts; |
| 40 | } ieee_long_double_shape_type; |
| 41 | |
| 42 | #endif |
| 43 | |
| 44 | #if __FLOAT_WORD_ORDER == __LITTLE_ENDIAN |
| 45 | |
| 46 | typedef union |
| 47 | { |
| 48 | long double value; |
| 49 | struct |
| 50 | { |
| 51 | uint32_t lsw; |
| 52 | uint32_t msw; |
| 53 | int sign_exponent:16; |
| 54 | unsigned int empty:16; |
| 55 | } parts; |
| 56 | } ieee_long_double_shape_type; |
| 57 | |
| 58 | #endif |
| 59 | |
| 60 | /* Get three 32 bit ints from a double. */ |
| 61 | |
| 62 | #define GET_LDOUBLE_WORDS(exp,ix0,ix1,d) \ |
| 63 | do { \ |
| 64 | ieee_long_double_shape_type ew_u; \ |
| 65 | ew_u.value = (d); \ |
| 66 | (exp) = ew_u.parts.sign_exponent; \ |
| 67 | (ix0) = ew_u.parts.msw; \ |
| 68 | (ix1) = ew_u.parts.lsw; \ |
| 69 | } while (0) |
| 70 | |
| 71 | /* Set a double from two 32 bit ints. */ |
| 72 | |
| 73 | #define SET_LDOUBLE_WORDS(d,exp,ix0,ix1) \ |
| 74 | do { \ |
| 75 | ieee_long_double_shape_type iw_u; \ |
| 76 | iw_u.parts.sign_exponent = (exp); \ |
| 77 | iw_u.parts.msw = (ix0); \ |
| 78 | iw_u.parts.lsw = (ix1); \ |
| 79 | (d) = iw_u.value; \ |
| 80 | } while (0) |
| 81 | |
| 82 | /* Get the more significant 32 bits of a long double mantissa. */ |
| 83 | |
| 84 | #define GET_LDOUBLE_MSW(v,d) \ |
| 85 | do { \ |
| 86 | ieee_long_double_shape_type sh_u; \ |
| 87 | sh_u.value = (d); \ |
| 88 | (v) = sh_u.parts.msw; \ |
| 89 | } while (0) |
| 90 | |
| 91 | /* Set the more significant 32 bits of a long double mantissa from an int. */ |
| 92 | |
| 93 | #define SET_LDOUBLE_MSW(d,v) \ |
| 94 | do { \ |
| 95 | ieee_long_double_shape_type sh_u; \ |
| 96 | sh_u.value = (d); \ |
| 97 | sh_u.parts.msw = (v); \ |
| 98 | (d) = sh_u.value; \ |
| 99 | } while (0) |
| 100 | |
| 101 | /* Get int from the exponent of a long double. */ |
| 102 | |
| 103 | #define GET_LDOUBLE_EXP(exp,d) \ |
| 104 | do { \ |
| 105 | ieee_long_double_shape_type ge_u; \ |
| 106 | ge_u.value = (d); \ |
| 107 | (exp) = ge_u.parts.sign_exponent; \ |
| 108 | } while (0) |
| 109 | |
| 110 | /* Set exponent of a long double from an int. */ |
| 111 | |
| 112 | #define SET_LDOUBLE_EXP(d,exp) \ |
| 113 | do { \ |
| 114 | ieee_long_double_shape_type se_u; \ |
| 115 | se_u.value = (d); \ |
| 116 | se_u.parts.sign_exponent = (exp); \ |
| 117 | (d) = se_u.value; \ |
| 118 | } while (0) |
| 119 | |
| 120 | #endif /* math_ldbl.h */ |
| 121 |
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