1 /* Test file for mpfr_log2p1. 2 3 Copyright 2001-2023 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 #include "mpfr-test.h" 24 25 #define TEST_FUNCTION mpfr_log2p1 26 #define TEST_RANDOM_EMAX 80 27 #include "tgeneric.c" 28 29 static void 30 special (void) 31 { 32 mpfr_t x; 33 int inex; 34 35 mpfr_init2 (x, MPFR_PREC_MIN); 36 37 mpfr_set_nan (x); 38 mpfr_clear_flags (); 39 inex = mpfr_log2p1 (x, x, MPFR_RNDN); 40 MPFR_ASSERTN (mpfr_nan_p (x) && inex == 0); 41 MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_NAN); 42 43 mpfr_set_inf (x, -1); 44 mpfr_clear_flags (); 45 inex = mpfr_log2p1 (x, x, MPFR_RNDN); 46 MPFR_ASSERTN (mpfr_nan_p (x) && inex == 0); 47 MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_NAN); 48 49 mpfr_set_inf (x, 1); 50 mpfr_clear_flags (); 51 inex = mpfr_log2p1 (x, x, MPFR_RNDN); 52 MPFR_ASSERTN (mpfr_inf_p (x) && mpfr_sgn (x) > 0 && inex == 0); 53 MPFR_ASSERTN (__gmpfr_flags == 0); 54 55 mpfr_set_ui (x, 0, MPFR_RNDN); 56 mpfr_clear_flags (); 57 inex = mpfr_log2p1 (x, x, MPFR_RNDN); 58 MPFR_ASSERTN (mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS (x) && inex == 0); 59 MPFR_ASSERTN (__gmpfr_flags == 0); 60 mpfr_neg (x, x, MPFR_RNDN); 61 mpfr_clear_flags (); 62 inex = mpfr_log2p1 (x, x, MPFR_RNDN); 63 MPFR_ASSERTN (mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_NEG (x) && inex == 0); 64 MPFR_ASSERTN (__gmpfr_flags == 0); 65 66 mpfr_set_si (x, -1, MPFR_RNDN); 67 mpfr_clear_flags (); 68 inex = mpfr_log2p1 (x, x, MPFR_RNDN); 69 MPFR_ASSERTN (mpfr_inf_p (x) && mpfr_sgn (x) < 0 && inex == 0); 70 MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_DIVBY0); 71 72 mpfr_set_si (x, -2, MPFR_RNDN); 73 mpfr_clear_flags (); 74 inex = mpfr_log2p1 (x, x, MPFR_RNDN); 75 MPFR_ASSERTN (mpfr_nan_p (x) && inex == 0); 76 MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_NAN); 77 78 /* include one hard-coded test */ 79 mpfr_set_prec (x, 32); 80 mpfr_set_ui (x, 17, MPFR_RNDN); 81 inex = mpfr_log2p1 (x, x, MPFR_RNDN); 82 MPFR_ASSERTN (mpfr_cmp_ui_2exp (x, 1119355719UL, -28) == 0); 83 MPFR_ASSERTN (inex < 0); 84 85 mpfr_clear (x); 86 } 87 88 /* check exact cases, when 1+x = 2^k */ 89 static void 90 check_exact (void) 91 { 92 mpfr_exp_t k; 93 mpfr_t x; 94 int inex, r; 95 96 #define KMAX 100 97 mpfr_init2 (x, KMAX); 98 for (k = -KMAX; k <= KMAX; k++) 99 RND_LOOP (r) 100 { 101 mpfr_set_ui_2exp (x, 1, k, (mpfr_rnd_t) r); 102 inex = mpfr_sub_ui (x, x, 1, (mpfr_rnd_t) r); 103 MPFR_ASSERTN(inex == 0); 104 inex = mpfr_log2p1 (x, x, (mpfr_rnd_t) r); 105 MPFR_ASSERTN(mpfr_cmp_si0 (x, k) == 0); 106 MPFR_ASSERTN(inex == 0); 107 } 108 mpfr_clear (x); 109 } 110 111 int 112 main (int argc, char *argv[]) 113 { 114 tests_start_mpfr (); 115 116 special (); 117 118 check_exact (); 119 120 test_generic (MPFR_PREC_MIN, 100, 50); 121 122 tests_end_mpfr (); 123 return 0; 124 } 125