1 /* mpfr_stack -- initialize a floating-point number with given allocation area 2 3 Copyright 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc. 4 Contributed by the AriC and Caramel projects, INRIA. 5 6 This file is part of the GNU MPFR Library. 7 8 The GNU MPFR Library is free software; you can redistribute it and/or modify 9 it under the terms of the GNU Lesser General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or (at your 11 option) any later version. 12 13 The GNU MPFR Library is distributed in the hope that it will be useful, but 14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 16 License for more details. 17 18 You should have received a copy of the GNU Lesser General Public License 19 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see 20 http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., 21 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ 22 23 #include "mpfr-impl.h" 24 25 #undef mpfr_custom_get_size 26 size_t 27 mpfr_custom_get_size (mpfr_prec_t prec) 28 { 29 return MPFR_PREC2LIMBS (prec) * BYTES_PER_MP_LIMB; 30 } 31 32 #undef mpfr_custom_init 33 void 34 mpfr_custom_init (void *mantissa, mpfr_prec_t prec) 35 { 36 return ; 37 } 38 39 #undef mpfr_custom_get_significand 40 void * 41 mpfr_custom_get_significand (mpfr_srcptr x) 42 { 43 return (void*) MPFR_MANT (x); 44 } 45 46 #undef mpfr_custom_get_exp 47 mpfr_exp_t 48 mpfr_custom_get_exp (mpfr_srcptr x) 49 { 50 return MPFR_EXP (x); 51 } 52 53 #undef mpfr_custom_move 54 void 55 mpfr_custom_move (mpfr_ptr x, void *new_position) 56 { 57 MPFR_MANT (x) = (mp_limb_t *) new_position; 58 } 59 60 #undef mpfr_custom_init_set 61 void 62 mpfr_custom_init_set (mpfr_ptr x, int kind, mpfr_exp_t exp, 63 mpfr_prec_t prec, void *mantissa) 64 { 65 mpfr_kind_t t; 66 int s; 67 mpfr_exp_t e; 68 69 if (kind >= 0) 70 { 71 t = (mpfr_kind_t) kind; 72 s = MPFR_SIGN_POS; 73 } 74 else 75 { 76 t = (mpfr_kind_t) -kind; 77 s = MPFR_SIGN_NEG; 78 } 79 MPFR_ASSERTD (t <= MPFR_REGULAR_KIND); 80 e = MPFR_LIKELY (t == MPFR_REGULAR_KIND) ? exp : 81 MPFR_UNLIKELY (t == MPFR_NAN_KIND) ? MPFR_EXP_NAN : 82 MPFR_UNLIKELY (t == MPFR_INF_KIND) ? MPFR_EXP_INF : MPFR_EXP_ZERO; 83 84 MPFR_PREC (x) = prec; 85 MPFR_SET_SIGN (x, s); 86 MPFR_EXP (x) = e; 87 MPFR_MANT (x) = (mp_limb_t*) mantissa; 88 return; 89 } 90 91 #undef mpfr_custom_get_kind 92 int 93 mpfr_custom_get_kind (mpfr_srcptr x) 94 { 95 if (MPFR_LIKELY (!MPFR_IS_SINGULAR (x))) 96 return (int) MPFR_REGULAR_KIND * MPFR_INT_SIGN (x); 97 if (MPFR_IS_INF (x)) 98 return (int) MPFR_INF_KIND * MPFR_INT_SIGN (x); 99 if (MPFR_IS_NAN (x)) 100 return (int) MPFR_NAN_KIND; 101 MPFR_ASSERTD (MPFR_IS_ZERO (x)); 102 return (int) MPFR_ZERO_KIND * MPFR_INT_SIGN (x); 103 } 104 105