gen-fib.c
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上传日期:2022-08-06
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- /* Generate Fibonacci table data.
- Copyright 2001, 2002, 2004 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or (at your
- option) any later version.
- The GNU MP Library is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include <stdio.h>
- #include "dumbmp.c"
- mpz_t *f;
- int fnum, fib_limit, luc_limit;
- void
- generate (int numb_bits)
- {
- mpz_t limit, l;
- int falloc, i;
- mpz_init_set_ui (limit, 1L);
- mpz_mul_2exp (limit, limit, numb_bits);
- /* fib(2n) > 2^n, so use 2n as a limit for the table size */
- falloc = 2 * numb_bits;
- f = (mpz_t *) xmalloc (falloc * sizeof (*f));
- mpz_init_set_ui (f[0], 1L); /* F[-1] */
- mpz_init_set_ui (f[1], 0L); /* F[0] */
- mpz_init (l);
- for (i = 2; ; i++)
- {
- ASSERT (i < falloc);
- /* F[i] = F[i-1] + F[i-2] */
- mpz_init (f[i]);
- mpz_add (f[i], f[i-1], f[i-2]);
- if (mpz_cmp (f[i], limit) >= 0)
- break;
- fnum = i+1;
- fib_limit = i-1;
- /* L[i] = F[i]+2*F[i-1] */
- mpz_add (l, f[i], f[i-1]);
- mpz_add (l, l, f[i-1]);
- if (mpz_cmp (l, limit) < 0)
- luc_limit = i-1;
- }
- mpz_clear (limit);
- }
- void
- header (int numb_bits)
- {
- printf ("/* This file generated by gen-fib.c - DO NOT EDIT. */n");
- printf ("n");
- printf ("#if GMP_NUMB_BITS != %dn", numb_bits);
- printf ("Error, error, this data is for %d bitsn", numb_bits);
- printf ("#endifn");
- printf ("n");
- printf ("#define FIB_TABLE_LIMIT %dn", fib_limit);
- printf ("#define FIB_TABLE_LUCNUM_LIMIT %dn", luc_limit);
- }
- void
- table (int numb_bits)
- {
- int i;
- printf ("/* This file generated by gen-fib.c - DO NOT EDIT. */n");
- printf ("n");
- printf ("#include "gmp.h"n");
- printf ("#include "gmp-impl.h"n");
- printf ("n");
- printf ("#if GMP_NUMB_BITS != %dn", numb_bits);
- printf ("Error, error, this data is for %d bitsn", numb_bits);
- printf ("#endifn");
- printf ("n");
- printf ("const mp_limb_tn");
- printf ("__gmp_fib_table[FIB_TABLE_LIMIT+2] = {n");
- for (i = 0; i < fnum; i++)
- {
- printf (" CNST_LIMB (0x");
- mpz_out_str (stdout, 16, f[i]);
- printf ("), /* %d */n", i-1);
- }
- printf ("};n");
- }
- int
- main (int argc, char *argv[])
- {
- int limb_bits, nail_bits, numb_bits;
- if (argc != 4)
- {
- fprintf (stderr, "Usage: gen-bases <header|table> <limbbits> <nailbits>n");
- exit (1);
- }
- limb_bits = atoi (argv[2]);
- nail_bits = atoi (argv[3]);
- if (limb_bits <= 0
- || nail_bits < 0
- || nail_bits >= limb_bits)
- {
- fprintf (stderr, "Invalid limb/nail bits: %d %dn",
- limb_bits, nail_bits);
- exit (1);
- }
- numb_bits = limb_bits - nail_bits;
- generate (numb_bits);
- if (strcmp (argv[1], "header") == 0)
- header (numb_bits);
- else if (strcmp (argv[1], "table") == 0)
- table (numb_bits);
- else
- {
- fprintf (stderr, "Invalid header/table choice: %sn", argv[1]);
- exit (1);
- }
- return 0;
- }