148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
/* Generate Fibonacci table data.
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Copyright 2001, 2002, 2004 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <stdio.h>
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#include "dumbmp.c"
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mpz_t *f;
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int fnum, fib_limit, luc_limit;
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void
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generate (int numb_bits)
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{
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mpz_t limit, l;
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int falloc, i;
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mpz_init_set_ui (limit, 1L);
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mpz_mul_2exp (limit, limit, numb_bits);
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/* fib(2n) > 2^n, so use 2n as a limit for the table size */
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falloc = 2 * numb_bits;
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f = (mpz_t *) xmalloc (falloc * sizeof (*f));
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mpz_init_set_ui (f[0], 1L); /* F[-1] */
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mpz_init_set_ui (f[1], 0L); /* F[0] */
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mpz_init (l);
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for (i = 2; ; i++)
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{
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ASSERT (i < falloc);
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/* F[i] = F[i-1] + F[i-2] */
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mpz_init (f[i]);
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mpz_add (f[i], f[i-1], f[i-2]);
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if (mpz_cmp (f[i], limit) >= 0)
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break;
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fnum = i+1;
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fib_limit = i-1;
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/* L[i] = F[i]+2*F[i-1] */
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mpz_add (l, f[i], f[i-1]);
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mpz_add (l, l, f[i-1]);
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if (mpz_cmp (l, limit) < 0)
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luc_limit = i-1;
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}
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mpz_clear (limit);
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}
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void
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header (int numb_bits)
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{
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printf ("/* This file generated by gen-fib.c - DO NOT EDIT. */\n");
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printf ("\n");
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printf ("#if GMP_NUMB_BITS != %d\n", numb_bits);
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printf ("#error, error, this data is for %d bits\n", numb_bits);
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printf ("#endif\n");
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printf ("\n");
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printf ("#define FIB_TABLE_LIMIT %d\n", fib_limit);
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printf ("#define FIB_TABLE_LUCNUM_LIMIT %d\n", luc_limit);
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}
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void
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table (int numb_bits)
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{
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int i;
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printf ("/* This file generated by gen-fib.c - DO NOT EDIT. */\n");
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printf ("\n");
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printf ("#include \"mpir.h\"\n");
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printf ("#include \"gmp-impl.h\"\n");
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printf ("\n");
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printf ("#if GMP_NUMB_BITS != %d\n", numb_bits);
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printf ("#error, error, this data is for %d bits\n", numb_bits);
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printf ("#endif\n");
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printf ("\n");
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printf ("const mp_limb_t\n");
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printf ("__gmp_fib_table[FIB_TABLE_LIMIT+2] = {\n");
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for (i = 0; i < fnum; i++)
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{
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printf (" CNST_LIMB (0x");
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mpz_out_str (stdout, 16, f[i]);
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printf ("), /* %d */\n", i-1);
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}
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printf ("};\n");
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}
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int
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main (int argc, char *argv[])
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{
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int limb_bits, nail_bits, numb_bits;
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if (argc != 4)
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{
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fprintf (stderr, "Usage: gen-bases <header|table> <limbbits> <nailbits>\n");
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exit (1);
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}
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limb_bits = atoi (argv[2]);
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nail_bits = atoi (argv[3]);
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if (limb_bits <= 0
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|| nail_bits < 0
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|| nail_bits >= limb_bits)
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{
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fprintf (stderr, "Invalid limb/nail bits: %d %d\n",
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limb_bits, nail_bits);
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exit (1);
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}
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numb_bits = limb_bits - nail_bits;
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generate (numb_bits);
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if (strcmp (argv[1], "header") == 0)
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header (numb_bits);
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else if (strcmp (argv[1], "table") == 0)
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table (numb_bits);
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else
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{
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fprintf (stderr, "Invalid header/table choice: %s\n", argv[1]);
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exit (1);
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}
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return 0;
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}
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