1 /* tpow -- test file for mpc_pow.
2
3 Copyright (C) 2009, 2011, 2012, 2013 INRIA
4
5 This file is part of GNU MPC.
6
7 GNU MPC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU Lesser General Public License as published by the
9 Free Software Foundation; either version 3 of the License, or (at your
10 option) any later version.
11
12 GNU MPC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
15 more details.
16
17 You should have received a copy of the GNU Lesser General Public License
18 along with this program. If not, see http://www.gnu.org/licenses/ .
19 */
20
21 #include "mpc-tests.h"
22
23 static void
reuse_bug(void)24 reuse_bug (void)
25 {
26 /* bug found by the automatic builds on
27 http://hydra.nixos.org/build/1469029/log/raw */
28 mpc_t x, y, z;
29 mp_prec_t prec = 2;
30
31 for (prec = 2; prec <= 20; prec ++)
32 {
33 mpc_init2 (x, prec);
34 mpc_init2 (y, prec);
35 mpc_init2 (z, prec);
36
37 mpfr_set_ui (mpc_realref (x), 0ul, MPFR_RNDN);
38 mpfr_set_ui_2exp (mpc_imagref (x), 3ul, -2, MPFR_RNDN);
39 mpc_set_ui (y, 8ul, MPC_RNDNN);
40
41 mpc_pow (z, x, y, MPC_RNDNN);
42 mpc_pow (y, x, y, MPC_RNDNN);
43 if (mpfr_signbit (mpc_imagref (y)) != mpfr_signbit (mpc_imagref (z)))
44 {
45 printf ("Error: regression, reuse_bug reproduced\n");
46 exit (1);
47 }
48
49 mpc_clear (x);
50 mpc_clear (y);
51 mpc_clear (z);
52 }
53 }
54
55 /* at precision 53, mpc_pow gave (inf,-inf), and
56 at precision 73, it gave (inf,inf) */
57 static void
bug20200208(void)58 bug20200208 (void)
59 {
60 mpc_t x, y, z, zr;
61 mpfr_prec_t prec1 = 53, prec2 = 73;
62
63 mpc_init2 (x, prec1);
64 mpc_init2 (y, prec1);
65 mpc_init2 (z, prec1);
66 mpc_init2 (zr, prec2);
67 mpfr_set_d (mpc_realref (x), 2.0851332234623992e-197, MPFR_RNDN);
68 mpfr_set_d (mpc_imagref (x), -5.6221457829327427e-17, MPFR_RNDN);
69 mpfr_set_d (mpc_realref (y), -2.1866902464899554e+138, MPFR_RNDN);
70 mpfr_set_d (mpc_imagref (y), 2.5932544562430328e-234, MPFR_RNDN);
71 mpc_pow (z, x, y, MPC_RNDNN);
72 mpc_pow (zr, x, y, MPC_RNDNN);
73 if (mpc_cmp (z, zr))
74 {
75 printf ("Inconsistent power with different precisions:\n");
76 mpfr_printf ("prec %lu: (%Re,%Re)\n",
77 prec1, mpc_realref (z), mpc_imagref (z));
78 mpfr_printf ("prec %lu: (%Re,%Re)\n",
79 prec2, mpc_realref (zr), mpc_imagref (zr));
80 exit (1);
81 }
82 mpc_clear (x);
83 mpc_clear (y);
84 mpc_clear (z);
85 mpc_clear (zr);
86 }
87
88 #define MPC_FUNCTION_CALL \
89 P[0].mpc_inex = mpc_pow (P[1].mpc, P[2].mpc, P[3].mpc, P[4].mpc_rnd)
90 #define MPC_FUNCTION_CALL_REUSE_OP1 \
91 P[0].mpc_inex = mpc_pow (P[1].mpc, P[1].mpc, P[3].mpc, P[4].mpc_rnd)
92 #define MPC_FUNCTION_CALL_REUSE_OP2 \
93 P[0].mpc_inex = mpc_pow (P[1].mpc, P[2].mpc, P[1].mpc, P[4].mpc_rnd)
94
95 #include "data_check.tpl"
96 #include "tgeneric.tpl"
97
98 int
main(void)99 main (void)
100 {
101 test_start ();
102
103 bug20200208 ();
104
105 reuse_bug ();
106
107 data_check_template ("pow.dsc", "pow.dat");
108
109 tgeneric_template ("pow.dsc", 2, 1024, 7, 10);
110
111 test_end ();
112
113 return 0;
114 }
115