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Side by Side Diff: gcc/mpfr/tests/tl2b.c

Issue 3050029: [gcc] GCC 4.5.0=>4.5.1 (Closed) Base URL: ssh://git@gitrw.chromium.org:9222/nacl-toolchain.git
Patch Set: Created 10 years, 4 months ago
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1 /* Test file for l2b constants.
2
3 Copyright 2007, 2008, 2009 Free Software Foundation, Inc.
4 Contributed by the Arenaire and Cacao 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 2.1 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.LIB. If not, write to
20 the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23 /* Execute this program with an argument to generate code that initializes
24 the l2b constants. */
25
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include "mpfr-test.h"
29
30 /* Must be a multiple of 4 */
31 static const int bits2use[] = {16, 32, 64, 96, 128, 256};
32 #define size_of_bits2use ((sizeof bits2use) / sizeof bits2use[0])
33
34 static __mpfr_struct l2b[BASE_MAX-1][2];
35
36 static void
37 print_mpfr (mpfr_srcptr x, const char *name)
38 {
39 unsigned char temp[16]; /* buffer for the base-256 string */
40 unsigned char *ptr; /* pointer to its first non-zero byte */
41 int size; /* size of the string */
42 int i; /* bits2use index */
43 int j; /* output limb index */
44 int k; /* byte index (in output limb) */
45 int r; /* digit index, relative to ptr */
46
47 if (printf ("#if 0\n") < 0)
48 { fprintf (stderr, "Error in printf\n"); exit (1); }
49 for (i = 0; i < size_of_bits2use; i++)
50 {
51 if (printf ("#elif BITS_PER_MP_LIMB == %d\n"
52 "const mp_limb_t %s__tab[] = { 0x", bits2use[i], name) < 0)
53 { fprintf (stderr, "Error in printf\n"); exit (1); }
54 size = mpn_get_str (temp, 256, MPFR_MANT (x), MPFR_LIMB_SIZE (x));
55 MPFR_ASSERTN (size <= 16);
56 ptr = temp;
57 /* Skip leading zeros. */
58 while (*ptr == 0)
59 {
60 ptr++;
61 size--;
62 MPFR_ASSERTN (size > 0);
63 }
64 MPFR_ASSERTN (*ptr >= 128);
65 for (j = (MPFR_PREC (x) - 1) / bits2use[i]; j >= 0; j--)
66 {
67 r = j * (bits2use[i] / 8);
68 for (k = 0; k < bits2use[i] / 8; k++)
69 if (printf ("%02x", r < size ? ptr[r++] : 0) < 0)
70 { fprintf (stderr, "Error in printf\n"); exit (1); }
71 if (printf (j == 0 ? " };\n" : ", 0x") < 0)
72 { fprintf (stderr, "Error in printf\n"); exit (1); }
73 }
74 }
75 if (printf ("#endif\n\n") < 0)
76 { fprintf (stderr, "Error in printf\n"); exit (1); }
77 }
78
79 static void
80 compute_l2b (int output)
81 {
82 mpfr_ptr p;
83 mpfr_srcptr t;
84 int beta, i;
85 int error = 0;
86 char buffer[30];
87
88 for (beta = 2; beta <= BASE_MAX; beta++)
89 {
90 for (i = 0; i < 2; i++)
91 {
92 p = &l2b[beta-2][i];
93
94 /* Compute the value */
95 if (i == 0)
96 {
97 /* 23-bit upper approximation to log(b)/log(2) */
98 mpfr_init2 (p, 23);
99 mpfr_set_ui (p, beta, GMP_RNDU);
100 mpfr_log2 (p, p, GMP_RNDU);
101 }
102 else
103 {
104 /* 76-bit upper approximation to log(2)/log(b) */
105 mpfr_init2 (p, 77);
106 mpfr_set_ui (p, beta, GMP_RNDD);
107 mpfr_log2 (p, p, GMP_RNDD);
108 mpfr_ui_div (p, 1, p, GMP_RNDU);
109 }
110
111 sprintf (buffer, "mpfr_l2b_%d_%d", beta, i);
112 if (output)
113 print_mpfr (p, buffer);
114
115 /* Check the value */
116 t = &__gmpfr_l2b[beta-2][i];
117 if (t == NULL || MPFR_PREC (t) == 0 || !mpfr_equal_p (p, t))
118 {
119 if (!output)
120 {
121 error = 1;
122 printf ("Error for constant %s\n", buffer);
123 }
124 }
125
126 if (!output)
127 mpfr_clear (p);
128 }
129 }
130
131 if (output)
132 {
133 if (printf ("const __mpfr_struct __gmpfr_l2b[BASE_MAX-1][2] = {\n")
134 < 0)
135 { fprintf (stderr, "Error in printf\n"); exit (1); }
136 for (beta = 2; beta <= BASE_MAX; beta++)
137 {
138 for (i = 0; i < 2; i++)
139 {
140 p = &l2b[beta-2][i];
141 if (printf (" %c {%3d,%2d,%3ld, (mp_limb_t *) "
142 "mpfr_l2b_%d_%d__tab }%s\n", i == 0 ? '{' : ' ',
143 (int) MPFR_PREC (p), MPFR_SIGN (p),
144 (long) MPFR_GET_EXP (p), beta, i,
145 i == 0 ? "," : beta < BASE_MAX ? " }," : " } };")
146 < 0)
147 { fprintf (stderr, "Error in printf\n"); exit (1); }
148 mpfr_clear (p);
149 }
150 }
151 }
152
153 /* If there was an error, the test fails. */
154 if (error)
155 exit (1);
156 }
157
158 int
159 main (int argc, char *argv[])
160 {
161 if (argc != 1)
162 {
163 /* Generate code that initializes the l2b constants. */
164 compute_l2b (1);
165 }
166 else
167 {
168 /* Check the l2b constants. */
169 tests_start_mpfr ();
170 compute_l2b (0);
171 tests_end_mpfr ();
172 }
173 return 0;
174 }
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