1 /* tremquo -- test file for mpfr_remquo and mpfr_remainder
3 Copyright 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
4 Contributed by the AriC and Caramel projects, INRIA.
6 This file is part of the GNU MPFR Library.
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.
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.
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. */
26 #include "mpfr-test.h"
37 mpfr_set_si (x, -1, MPFR_RNDN);
38 mpfr_set_str_binary (y, "1.100100100001111110110101010001000100001011010001100001000110100110001001100011001100010100010111000000011011100000111001101000100101001000000100100111000001000100010100110011111010");
39 mpfr_remainder (r1, x, y, MPFR_RNDU);
40 /* since the quotient is -1, r1 is the rounding of x+y */
41 mpfr_add (r2, x, y, MPFR_RNDU);
42 if (mpfr_cmp (r1, r2))
44 printf ("Error in mpfr_remainder (bug20090227)\n");
58 main (int argc, char *argv[])
63 if (argc == 3) /* usage: tremquo x y (rnd=MPFR_RNDN implicit) */
65 mpfr_init2 (x, GMP_NUMB_BITS);
66 mpfr_init2 (y, GMP_NUMB_BITS);
67 mpfr_init2 (r, GMP_NUMB_BITS);
68 mpfr_set_str (x, argv[1], 10, MPFR_RNDN);
69 mpfr_set_str (y, argv[2], 10, MPFR_RNDN);
70 mpfr_remquo (r, q, x, y, MPFR_RNDN);
72 mpfr_out_str (stdout, 10, 0, r, MPFR_RNDN);
73 printf (" q=%ld\n", q[0]);
90 mpfr_set_ui (y, 1, MPFR_RNDN);
91 mpfr_remquo (r, q, x, y, MPFR_RNDN);
92 MPFR_ASSERTN(mpfr_nan_p (r));
94 mpfr_set_ui (x, 1, MPFR_RNDN);
96 mpfr_remquo (r, q, x, y, MPFR_RNDN);
97 MPFR_ASSERTN(mpfr_nan_p (r));
99 mpfr_set_inf (x, 1); /* +Inf */
100 mpfr_set_ui (y, 1, MPFR_RNDN);
101 mpfr_remquo (r, q, x, y, MPFR_RNDN);
102 MPFR_ASSERTN (mpfr_nan_p (r));
104 mpfr_set_inf (x, 1); /* +Inf */
105 mpfr_set_ui (y, 0, MPFR_RNDN);
106 mpfr_remquo (r, q, x, y, MPFR_RNDN);
107 MPFR_ASSERTN (mpfr_nan_p (r));
109 mpfr_set_inf (x, 1); /* +Inf */
111 mpfr_remquo (r, q, x, y, MPFR_RNDN);
112 MPFR_ASSERTN (mpfr_nan_p (r));
114 mpfr_set_ui (x, 0, MPFR_RNDN);
116 mpfr_remquo (r, q, x, y, MPFR_RNDN);
117 MPFR_ASSERTN (mpfr_cmp_ui (r, 0) == 0 && MPFR_IS_POS (r));
118 MPFR_ASSERTN (q[0] == (long) 0);
120 mpfr_set_ui (x, 0, MPFR_RNDN);
121 mpfr_neg (x, x, MPFR_RNDN); /* -0 */
123 mpfr_remquo (r, q, x, y, MPFR_RNDN);
124 MPFR_ASSERTN (mpfr_cmp_ui (r, 0) == 0 && MPFR_IS_NEG (r));
125 MPFR_ASSERTN (q[0] == (long) 0);
127 mpfr_set_ui (x, 17, MPFR_RNDN);
129 mpfr_remquo (r, q, x, y, MPFR_RNDN);
130 MPFR_ASSERTN (mpfr_cmp (r, x) == 0);
131 MPFR_ASSERTN (q[0] == (long) 0);
133 mpfr_set_ui (x, 17, MPFR_RNDN);
134 mpfr_set_ui (y, 0, MPFR_RNDN);
135 mpfr_remquo (r, q, x, y, MPFR_RNDN);
136 MPFR_ASSERTN (mpfr_nan_p (r));
138 mpfr_set_ui (x, 0, MPFR_RNDN);
139 mpfr_set_ui (y, 17, MPFR_RNDN);
140 mpfr_remquo (r, q, x, y, MPFR_RNDN);
141 MPFR_ASSERTN (mpfr_cmp_ui (r, 0) == 0 && MPFR_IS_POS (r));
142 MPFR_ASSERTN (q[0] == (long) 0);
144 mpfr_set_ui (x, 0, MPFR_RNDN);
145 mpfr_neg (x, x, MPFR_RNDN);
146 mpfr_set_ui (y, 17, MPFR_RNDN);
147 mpfr_remquo (r, q, x, y, MPFR_RNDN);
148 MPFR_ASSERTN (mpfr_cmp_ui (r, 0) == 0 && MPFR_IS_NEG (r));
149 MPFR_ASSERTN (q[0] == (long) 0);
151 mpfr_set_prec (x, 53);
152 mpfr_set_prec (y, 53);
154 /* check four possible sign combinations */
155 mpfr_set_ui (x, 42, MPFR_RNDN);
156 mpfr_set_ui (y, 17, MPFR_RNDN);
157 mpfr_remquo (r, q, x, y, MPFR_RNDN);
158 MPFR_ASSERTN (mpfr_cmp_ui (r, 8) == 0);
159 MPFR_ASSERTN (q[0] == (long) 2);
160 mpfr_set_si (x, -42, MPFR_RNDN);
161 mpfr_set_ui (y, 17, MPFR_RNDN);
162 mpfr_remquo (r, q, x, y, MPFR_RNDN);
163 MPFR_ASSERTN (mpfr_cmp_si (r, -8) == 0);
164 MPFR_ASSERTN (q[0] == (long) -2);
165 mpfr_set_si (x, -42, MPFR_RNDN);
166 mpfr_set_si (y, -17, MPFR_RNDN);
167 mpfr_remquo (r, q, x, y, MPFR_RNDN);
168 MPFR_ASSERTN (mpfr_cmp_si (r, -8) == 0);
169 MPFR_ASSERTN (q[0] == (long) 2);
170 mpfr_set_ui (x, 42, MPFR_RNDN);
171 mpfr_set_si (y, -17, MPFR_RNDN);
172 mpfr_remquo (r, q, x, y, MPFR_RNDN);
173 MPFR_ASSERTN (mpfr_cmp_ui (r, 8) == 0);
174 MPFR_ASSERTN (q[0] == (long) -2);
176 mpfr_set_prec (x, 100);
177 mpfr_set_prec (y, 50);
178 mpfr_set_ui (x, 42, MPFR_RNDN);
179 mpfr_nextabove (x); /* 42 + 2^(-94) */
180 mpfr_set_ui (y, 21, MPFR_RNDN);
181 mpfr_remquo (r, q, x, y, MPFR_RNDN);
182 MPFR_ASSERTN (mpfr_cmp_ui_2exp (r, 1, -94) == 0);
183 MPFR_ASSERTN (q[0] == (long) 2);
185 mpfr_set_prec (x, 50);
186 mpfr_set_prec (y, 100);
187 mpfr_set_ui (x, 42, MPFR_RNDN);
188 mpfr_nextabove (x); /* 42 + 2^(-44) */
189 mpfr_set_ui (y, 21, MPFR_RNDN);
190 mpfr_remquo (r, q, x, y, MPFR_RNDN);
191 MPFR_ASSERTN (mpfr_cmp_ui_2exp (r, 1, -44) == 0);
192 MPFR_ASSERTN (q[0] == (long) 2);
194 mpfr_set_prec (x, 100);
195 mpfr_set_prec (y, 50);
196 mpfr_set_ui (x, 42, MPFR_RNDN);
197 mpfr_set_ui (y, 21, MPFR_RNDN);
198 mpfr_nextabove (y); /* 21 + 2^(-45) */
199 mpfr_remquo (r, q, x, y, MPFR_RNDN);
200 /* r should be 42 - 2*(21 + 2^(-45)) = -2^(-44) */
201 MPFR_ASSERTN (mpfr_cmp_si_2exp (r, -1, -44) == 0);
202 MPFR_ASSERTN (q[0] == (long) 2);
204 mpfr_set_prec (x, 50);
205 mpfr_set_prec (y, 100);
206 mpfr_set_ui (x, 42, MPFR_RNDN);
207 mpfr_set_ui (y, 21, MPFR_RNDN);
208 mpfr_nextabove (y); /* 21 + 2^(-95) */
209 mpfr_remquo (r, q, x, y, MPFR_RNDN);
210 /* r should be 42 - 2*(21 + 2^(-95)) = -2^(-94) */
211 MPFR_ASSERTN (mpfr_cmp_si_2exp (r, -1, -94) == 0);
212 MPFR_ASSERTN (q[0] == (long) 2);
214 /* exercise large quotient */
215 mpfr_set_ui_2exp (x, 1, 65, MPFR_RNDN);
216 mpfr_set_ui (y, 1, MPFR_RNDN);
217 /* quotient is 2^65 */
218 mpfr_remquo (r, q, x, y, MPFR_RNDN);
219 MPFR_ASSERTN (mpfr_cmp_si (r, 0) == 0);
220 MPFR_ASSERTN (q[0] % 1073741824L == 0L);
222 /* another large quotient */
223 mpfr_set_prec (x, 65);
224 mpfr_set_prec (y, 65);
225 mpfr_const_pi (x, MPFR_RNDN);
226 mpfr_mul_2exp (x, x, 63, MPFR_RNDN);
227 mpfr_const_log2 (y, MPFR_RNDN);
228 mpfr_set_prec (r, 10);
229 mpfr_remquo (r, q, x, y, MPFR_RNDN);
230 /* q should be 41803643793084085130, r should be 605/2048 */
231 MPFR_ASSERTN (mpfr_cmp_ui_2exp (r, 605, -11) == 0);
232 MPFR_ASSERTN ((q[0] > 0) && ((q[0] % 1073741824L) == 733836170L));
234 /* check cases where quotient is 1.5 +/- eps */
235 mpfr_set_prec (x, 65);
236 mpfr_set_prec (y, 65);
237 mpfr_set_prec (r, 63);
238 mpfr_set_ui (x, 3, MPFR_RNDN);
239 mpfr_set_ui (y, 2, MPFR_RNDN);
240 mpfr_remquo (r, q, x, y, MPFR_RNDN);
241 /* x/y = 1.5, quotient should be 2 (even rule), remainder should be -1 */
242 MPFR_ASSERTN (mpfr_cmp_si (r, -1) == 0);
243 MPFR_ASSERTN (q[0] == 2L);
244 mpfr_set_ui (x, 3, MPFR_RNDN);
245 mpfr_nextabove (x); /* 3 + 2^(-63) */
246 mpfr_set_ui (y, 2, MPFR_RNDN);
247 mpfr_remquo (r, q, x, y, MPFR_RNDN);
248 /* x/y = 1.5 + 2^(-64), quo should be 2, r should be -1 + 2^(-63) */
249 MPFR_ASSERTN (mpfr_add_ui (r, r, 1, MPFR_RNDN) == 0);
250 MPFR_ASSERTN (mpfr_cmp_ui_2exp (r, 1, -63) == 0);
251 MPFR_ASSERTN (q[0] == 2L);
252 mpfr_set_ui (x, 3, MPFR_RNDN);
253 mpfr_set_ui (y, 2, MPFR_RNDN);
254 mpfr_nextabove (y); /* 2 + 2^(-63) */
255 mpfr_remquo (r, q, x, y, MPFR_RNDN);
256 /* x/y = 1.5 - eps, quo should be 1, r should be 1 - 2^(-63) */
257 MPFR_ASSERTN (mpfr_sub_ui (r, r, 1, MPFR_RNDN) == 0);
258 MPFR_ASSERTN (mpfr_cmp_si_2exp (r, -1, -63) == 0);
259 MPFR_ASSERTN (q[0] == 1L);
261 /* bug founds by Kaveh Ghazi, 3 May 2007 */
262 mpfr_set_ui (x, 2, MPFR_RNDN);
263 mpfr_set_ui (y, 3, MPFR_RNDN);
264 mpfr_remainder (r, x, y, MPFR_RNDN);
265 MPFR_ASSERTN (mpfr_cmp_si (r, -1) == 0);
267 mpfr_set_si (x, -1, MPFR_RNDN);
268 mpfr_set_ui (y, 1, MPFR_RNDN);
269 mpfr_remainder (r, x, y, MPFR_RNDN);
270 MPFR_ASSERTN (mpfr_cmp_si (r, 0) == 0 && MPFR_SIGN (r) < 0);
272 /* check argument reuse */
273 mpfr_set_si (x, -1, MPFR_RNDN);
274 mpfr_set_ui (y, 1, MPFR_RNDN);
275 mpfr_remainder (x, x, y, MPFR_RNDN);
276 MPFR_ASSERTN (mpfr_cmp_si (x, 0) == 0 && MPFR_SIGN (x) < 0);
278 mpfr_set_ui_2exp (x, 1, mpfr_get_emax () - 1, MPFR_RNDN);
279 mpfr_set_ui_2exp (y, 1, mpfr_get_emin (), MPFR_RNDN);
280 mpfr_remquo (r, q, x, y, MPFR_RNDN);
281 MPFR_ASSERTN (mpfr_zero_p (r) && MPFR_SIGN (r) > 0);
282 MPFR_ASSERTN (q[0] == 0);