1 /* custom interface -- initialize a floating-point number with given 2 allocation area 3 4 Copyright 2005-2023 Free Software Foundation, Inc. 5 Contributed by the AriC and Caramba projects, INRIA. 6 7 This file is part of the GNU MPFR Library. 8 9 The GNU MPFR Library is free software; you can redistribute it and/or modify 10 it under the terms of the GNU Lesser General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or (at your 12 option) any later version. 13 14 The GNU MPFR Library is distributed in the hope that it will be useful, but 15 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17 License for more details. 18 19 You should have received a copy of the GNU Lesser General Public License 20 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see 21 https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., 22 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ 23 24 #include "mpfr-impl.h" 25 26 #undef mpfr_custom_get_size 27 size_t 28 mpfr_custom_get_size (mpfr_prec_t prec) 29 { 30 return MPFR_PREC2LIMBS (prec) * MPFR_BYTES_PER_MP_LIMB; 31 } 32 33 #undef mpfr_custom_init 34 void 35 mpfr_custom_init (void *mantissa, mpfr_prec_t prec) 36 { 37 return ; 38 } 39 40 #undef mpfr_custom_get_significand 41 void * 42 mpfr_custom_get_significand (mpfr_srcptr x) 43 { 44 return (void*) MPFR_MANT (x); 45 } 46 47 #undef mpfr_custom_get_exp 48 mpfr_exp_t 49 mpfr_custom_get_exp (mpfr_srcptr x) 50 { 51 return MPFR_EXP (x); 52 } 53 54 #undef mpfr_custom_move 55 void 56 mpfr_custom_move (mpfr_ptr x, void *new_position) 57 { 58 MPFR_MANT (x) = (mp_limb_t *) new_position; 59 } 60 61 #undef mpfr_custom_init_set 62 void 63 mpfr_custom_init_set (mpfr_ptr x, int kind, mpfr_exp_t exp, 64 mpfr_prec_t prec, void *mantissa) 65 { 66 mpfr_kind_t t; 67 int s; 68 mpfr_exp_t e; 69 70 if (kind >= 0) 71 { 72 t = (mpfr_kind_t) kind; 73 s = MPFR_SIGN_POS; 74 } 75 else 76 { 77 t = (mpfr_kind_t) -kind; 78 s = MPFR_SIGN_NEG; 79 } 80 MPFR_ASSERTD (t <= MPFR_REGULAR_KIND); 81 e = MPFR_LIKELY (t == MPFR_REGULAR_KIND) ? exp : 82 MPFR_UNLIKELY (t == MPFR_NAN_KIND) ? MPFR_EXP_NAN : 83 MPFR_UNLIKELY (t == MPFR_INF_KIND) ? MPFR_EXP_INF : MPFR_EXP_ZERO; 84 85 MPFR_PREC (x) = prec; 86 MPFR_SET_SIGN (x, s); 87 MPFR_EXP (x) = e; 88 MPFR_MANT (x) = (mp_limb_t*) mantissa; 89 return; 90 } 91 92 #undef mpfr_custom_get_kind 93 int 94 mpfr_custom_get_kind (mpfr_srcptr x) 95 { 96 if (MPFR_LIKELY (!MPFR_IS_SINGULAR (x))) 97 return (int) MPFR_REGULAR_KIND * MPFR_INT_SIGN (x); 98 if (MPFR_IS_INF (x)) 99 return (int) MPFR_INF_KIND * MPFR_INT_SIGN (x); 100 if (MPFR_IS_NAN (x)) 101 return (int) MPFR_NAN_KIND; 102 MPFR_ASSERTD (MPFR_IS_ZERO (x)); 103 return (int) MPFR_ZERO_KIND * MPFR_INT_SIGN (x); 104 } 105 106