1 /* Test file for mpfr_acos. 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_acos 26 #include "tgeneric.c" 27 28 static void 29 special (void) 30 { 31 mpfr_t x, y; 32 int inex1, inex2; 33 34 mpfr_init2 (x, 32); 35 mpfr_init2 (y, 32); 36 37 mpfr_set_str_binary (x, "0.10001000001001011000100001E-6"); 38 mpfr_acos (y, x, MPFR_RNDN); 39 mpfr_set_str_binary (x, "1.10001111111111110001110110001"); 40 if (mpfr_cmp (x, y)) 41 { 42 printf ("Error in mpfr_acos (1)\n"); 43 exit (1); 44 } 45 46 mpfr_set_str_binary (x, "-0.01101011110111100111010011001011"); 47 mpfr_acos (y, x, MPFR_RNDZ); 48 mpfr_set_str_binary (x, "10.0000000101111000011101000101"); 49 if (mpfr_cmp (x, y)) 50 { 51 printf ("Error in mpfr_acos (2)\n"); 52 mpfr_dump (y); 53 exit (1); 54 } 55 56 mpfr_set_prec (x, 2); 57 mpfr_set_ui (x, 0, MPFR_RNDN); 58 inex1 = mpfr_acos (x, x, MPFR_RNDN); /* Pi/2 */ 59 inex2 = mpfr_const_pi (x, MPFR_RNDN); 60 if (inex1 != inex2) 61 { 62 printf ("Error in mpfr_acos (3) for prec=2\n"); 63 exit (1); 64 } 65 66 mpfr_clear (y); 67 mpfr_clear (x); 68 } 69 70 static void 71 special_overflow (void) 72 { 73 mpfr_t x, y; 74 mpfr_exp_t emin, emax; 75 76 emin = mpfr_get_emin (); 77 emax = mpfr_get_emax (); 78 79 set_emin (-125); 80 set_emax (128); 81 mpfr_init2 (x, 24); 82 mpfr_init2 (y, 48); 83 mpfr_set_str_binary (x, "0.101100100000000000110100E0"); 84 mpfr_acos (y, x, MPFR_RNDN); 85 if (mpfr_cmp_str (y, "0.110011010100101111000100111010111011010000001001E0", 86 2, MPFR_RNDN)) 87 { 88 printf("Special Overflow error.\n"); 89 mpfr_dump (y); 90 exit (1); 91 } 92 mpfr_clear (y); 93 mpfr_clear (x); 94 set_emin (emin); 95 set_emax (emax); 96 } 97 98 int 99 main (void) 100 { 101 mpfr_t x, y; 102 int r; 103 104 tests_start_mpfr (); 105 106 special_overflow (); 107 special (); 108 109 mpfr_init (x); 110 mpfr_init (y); 111 112 MPFR_SET_NAN(x); 113 mpfr_acos (y, x, MPFR_RNDN); 114 if (mpfr_nan_p(y) == 0) 115 { 116 printf ("Error: acos(NaN) != NaN\n"); 117 exit (1); 118 } 119 120 mpfr_set_ui (x, 2, MPFR_RNDN); 121 mpfr_acos (y, x, MPFR_RNDN); 122 if (mpfr_nan_p(y) == 0) 123 { 124 printf ("Error: acos(2) != NaN\n"); 125 exit (1); 126 } 127 128 mpfr_set_si (x, -2, MPFR_RNDN); 129 mpfr_acos (y, x, MPFR_RNDN); 130 if (mpfr_nan_p(y) == 0) 131 { 132 printf ("Error: acos(-2) != NaN\n"); 133 exit (1); 134 } 135 136 /* acos (1) = 0 */ 137 mpfr_set_ui (x, 1, MPFR_RNDN); 138 mpfr_acos (y, x, MPFR_RNDN); 139 if (MPFR_NOTZERO (y) || MPFR_IS_NEG (y)) 140 { 141 printf ("Error: acos(1) != +0.0\n"); 142 exit (1); 143 } 144 145 /* acos (0) = Pi/2 */ 146 RND_LOOP (r) 147 { 148 mpfr_set_ui (x, 0, MPFR_RNDN); /* exact */ 149 mpfr_acos (y, x, (mpfr_rnd_t) r); 150 mpfr_const_pi (x, (mpfr_rnd_t) r); 151 mpfr_div_2ui (x, x, 1, MPFR_RNDN); /* exact */ 152 if (mpfr_cmp (x, y)) 153 { 154 printf ("Error: acos(0) != Pi/2 for rnd=%s\n", 155 mpfr_print_rnd_mode ((mpfr_rnd_t) r)); 156 exit (1); 157 } 158 } 159 160 /* acos (-1) = Pi */ 161 RND_LOOP (r) 162 { 163 mpfr_set_si (x, -1, MPFR_RNDN); /* exact */ 164 mpfr_acos (y, x, (mpfr_rnd_t) r); 165 mpfr_const_pi (x, (mpfr_rnd_t) r); 166 if (mpfr_cmp (x, y)) 167 { 168 printf ("Error: acos(1) != Pi for rnd=%s\n", 169 mpfr_print_rnd_mode ((mpfr_rnd_t) r)); 170 exit (1); 171 } 172 } 173 174 test_generic (MPFR_PREC_MIN, 100, 7); 175 176 mpfr_clear (x); 177 mpfr_clear (y); 178 179 data_check ("data/acos", mpfr_acos, "mpfr_acos"); 180 bad_cases (mpfr_acos, mpfr_cos, "mpfr_acos", 0, -40, 2, 4, 128, 800, 30); 181 182 tests_end_mpfr (); 183 return 0; 184 } 185