1 /* Generate Fibonacci table data.
3 Copyright 2001, 2002, 2004 Free Software Foundation, Inc.
5 This file is part of the GNU MP Library.
7 The GNU MP Library is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Lesser General Public License as published by
9 the Free Software Foundation; either version 2.1 of the License, or (at your
10 option) any later version.
12 The GNU MP Library is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15 License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with the GNU MP Library; see the file COPYING.LIB. If not, write to
19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
20 MA 02110-1301, USA. */
26 int fnum, fib_limit, luc_limit;
29 generate (int numb_bits)
34 mpz_init_set_ui (limit, 1L);
35 mpz_mul_2exp (limit, limit, numb_bits);
37 /* fib(2n) > 2^n, so use 2n as a limit for the table size */
38 falloc = 2 * numb_bits;
39 f = (mpz_t *) xmalloc (falloc * sizeof (*f));
41 mpz_init_set_ui (f[0], 1L); /* F[-1] */
42 mpz_init_set_ui (f[1], 0L); /* F[0] */
50 /* F[i] = F[i-1] + F[i-2] */
52 mpz_add (f[i], f[i-1], f[i-2]);
53 if (mpz_cmp (f[i], limit) >= 0)
59 /* L[i] = F[i]+2*F[i-1] */
60 mpz_add (l, f[i], f[i-1]);
61 mpz_add (l, l, f[i-1]);
63 if (mpz_cmp (l, limit) < 0)
72 header (int numb_bits)
74 printf ("/* This file generated by gen-fib.c - DO NOT EDIT. */\n");
76 printf ("#if GMP_NUMB_BITS != %d\n", numb_bits);
77 printf ("Error, error, this data is for %d bits\n", numb_bits);
80 printf ("#define FIB_TABLE_LIMIT %d\n", fib_limit);
81 printf ("#define FIB_TABLE_LUCNUM_LIMIT %d\n", luc_limit);
89 printf ("/* This file generated by gen-fib.c - DO NOT EDIT. */\n");
91 printf ("#include \"gmp.h\"\n");
92 printf ("#include \"gmp-impl.h\"\n");
94 printf ("#if GMP_NUMB_BITS != %d\n", numb_bits);
95 printf ("Error, error, this data is for %d bits\n", numb_bits);
98 printf ("const mp_limb_t\n");
99 printf ("__gmp_fib_table[FIB_TABLE_LIMIT+2] = {\n");
101 for (i = 0; i < fnum; i++)
103 printf (" CNST_LIMB (0x");
104 mpz_out_str (stdout, 16, f[i]);
105 printf ("), /* %d */\n", i-1);
111 main (int argc, char *argv[])
113 int limb_bits, nail_bits, numb_bits;
117 fprintf (stderr, "Usage: gen-bases <header|table> <limbbits> <nailbits>\n");
121 limb_bits = atoi (argv[2]);
122 nail_bits = atoi (argv[3]);
126 || nail_bits >= limb_bits)
128 fprintf (stderr, "Invalid limb/nail bits: %d %d\n",
129 limb_bits, nail_bits);
132 numb_bits = limb_bits - nail_bits;
134 generate (numb_bits);
136 if (strcmp (argv[1], "header") == 0)
138 else if (strcmp (argv[1], "table") == 0)
142 fprintf (stderr, "Invalid header/table choice: %s\n", argv[1]);