1 /* mpfr_add_ui -- add a floating-point number with a machine integer 2 3 Copyright 2000-2004, 2006-2020 Free Software Foundation, Inc. 4 Contributed by the AriC and Caramba 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 https://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 #define MPFR_NEED_LONGLONG_H 24 #include "mpfr-impl.h" 25 26 MPFR_HOT_FUNCTION_ATTR int 27 mpfr_add_ui (mpfr_ptr y, mpfr_srcptr x, unsigned long int u, mpfr_rnd_t rnd_mode) 28 { 29 MPFR_LOG_FUNC 30 (("x[%Pu]=%.*Rg u=%lu rnd=%d", 31 mpfr_get_prec(x), mpfr_log_prec, x, u, rnd_mode), 32 ("y[%Pu]=%.*Rg", mpfr_get_prec (y), mpfr_log_prec, y)); 33 34 /* (unsigned long) 0 is assumed to be a real 0 (unsigned) */ 35 if (MPFR_UNLIKELY (u == 0)) 36 return mpfr_set (y, x, rnd_mode); 37 38 /* This block is actually useless, but this is a minor optimization. */ 39 if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (x))) 40 { 41 if (MPFR_IS_NAN (x)) 42 { 43 MPFR_SET_NAN (y); 44 MPFR_RET_NAN; 45 } 46 if (MPFR_IS_INF (x)) 47 { 48 MPFR_SET_INF (y); 49 MPFR_SET_SAME_SIGN (y, x); 50 MPFR_RET (0); /* +/-infinity is exact */ 51 } 52 MPFR_ASSERTD (MPFR_IS_ZERO (x) && u != 0); 53 /* Note: the fact that u != 0 is important due to signed zeros. */ 54 return mpfr_set_ui (y, u, rnd_mode); 55 } 56 57 /* Main code */ 58 { 59 int inex; 60 MPFR_SAVE_EXPO_DECL (expo); 61 62 /* Optimization note: Exponent save/restore operations may be 63 removed if mpfr_add works even when uu is out-of-range. */ 64 MPFR_SAVE_EXPO_MARK (expo); 65 66 #ifdef MPFR_LONG_WITHIN_LIMB 67 { 68 mpfr_t uu; 69 mp_limb_t up[1]; 70 int cnt; 71 72 MPFR_TMP_INIT1 (up, uu, GMP_NUMB_BITS); 73 /* So, u fits in a mp_limb_t, which justifies the casts below. */ 74 MPFR_ASSERTD (u != 0); 75 count_leading_zeros (cnt, (mp_limb_t) u); 76 up[0] = (mp_limb_t) u << cnt; 77 MPFR_SET_EXP (uu, GMP_NUMB_BITS - cnt); 78 inex = mpfr_add (y, x, uu, rnd_mode); 79 } 80 #else 81 { 82 mpfr_t uu; 83 84 mpfr_init2 (uu, sizeof (unsigned long) * CHAR_BIT); 85 mpfr_set_ui (uu, u, MPFR_RNDZ); 86 inex = mpfr_add (y, x, uu, rnd_mode); 87 mpfr_clear (uu); 88 } 89 #endif 90 91 MPFR_SAVE_EXPO_UPDATE_FLAGS (expo, __gmpfr_flags); 92 MPFR_SAVE_EXPO_FREE (expo); 93 return mpfr_check_range (y, inex, rnd_mode); 94 } 95 } 96