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gen-fib.c
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1 /* Generate Fibonacci table data.
2 
3 Copyright 2001, 2002, 2004, 2012, 2014, 2015 Free Software Foundation, Inc.
4 
5 This file is part of the GNU MP Library.
6 
7 The GNU MP Library is free software; you can redistribute it and/or modify
8 it under the terms of either:
9 
10  * the GNU Lesser General Public License as published by the Free
11  Software Foundation; either version 3 of the License, or (at your
12  option) any later version.
13 
14 or
15 
16  * the GNU General Public License as published by the Free Software
17  Foundation; either version 2 of the License, or (at your option) any
18  later version.
19 
20 or both in parallel, as here.
21 
22 The GNU MP Library is distributed in the hope that it will be useful, but
23 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
24 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
25 for more details.
26 
27 You should have received copies of the GNU General Public License and the
28 GNU Lesser General Public License along with the GNU MP Library. If not,
29 see https://www.gnu.org/licenses/. */
30 
31 #include <stdio.h>
32 #include "bootstrap.c"
33 
36 
37 void
38 generate (int numb_bits)
39 {
40  mpz_t limit, l;
41  int falloc, i;
42 
43  mpz_init2 (limit, numb_bits + 1);
44  mpz_setbit (limit, numb_bits);
45 
46  /* fib(2n) > 2^n, so use 2n as a limit for the table size */
47  falloc = 2 * numb_bits;
48  f = (mpz_t*) xmalloc (falloc * sizeof (*f));
49 
50  mpz_init_set_ui (f[0], 1L); /* F[-1] */
51  mpz_init_set_ui (f[1], 0L); /* F[0] */
52 
53  mpz_init (l);
54 
55  for (i = 2; ; i++)
56  {
57  assert (i < falloc);
58 
59  /* F[i] = F[i-1] + F[i-2] */
60  mpz_init (f[i]);
61  mpz_add (f[i], f[i-1], f[i-2]);
62  if (mpz_cmp (f[i], limit) >= 0)
63  break;
64 
65  fnum = i+1;
66  fib_limit = i-1;
67 
68  /* L[i] = F[i]+2*F[i-1] */
69  mpz_add (l, f[i], f[i-1]);
70  mpz_add (l, l, f[i-1]);
71 
72  if (mpz_cmp (l, limit) < 0)
73  luc_limit = i-1;
74  }
75 
76  mpz_clear (limit);
77 }
78 
79 
80 void
81 header (int numb_bits)
82 {
83  printf ("/* This file generated by gen-fib.c - DO NOT EDIT. */\n");
84  printf ("\n");
85  printf ("#if GMP_NUMB_BITS != %d\n", numb_bits);
86  printf ("Error, error, this data is for %d bits\n", numb_bits);
87  printf ("#endif\n");
88  printf ("\n");
89  printf ("#define FIB_TABLE_LIMIT %d\n", fib_limit);
90  printf ("#define FIB_TABLE_LUCNUM_LIMIT %d\n", luc_limit);
91 }
92 
93 void
94 table (int numb_bits)
95 {
96  int i;
97 
98  printf ("/* This file generated by gen-fib.c - DO NOT EDIT. */\n");
99  printf ("\n");
100  printf ("#include \"gmp.h\"\n");
101  printf ("#include \"gmp-impl.h\"\n");
102  printf ("\n");
103  printf ("#if GMP_NUMB_BITS != %d\n", numb_bits);
104  printf ("Error, error, this data is for %d bits\n", numb_bits);
105  printf ("#endif\n");
106  printf ("\n");
107  printf ("const mp_limb_t\n");
108  printf ("__gmp_fib_table[FIB_TABLE_LIMIT+2] = {\n");
109 
110  for (i = 0; i < fnum; i++)
111  {
112  printf (" CNST_LIMB (0x");
113  mpz_out_str (stdout, 16, f[i]);
114  printf ("), /* %d */\n", i-1);
115  }
116  printf ("};\n");
117 }
118 
119 int
120 main (int argc, char *argv[])
121 {
122  int limb_bits, nail_bits, numb_bits;
123 
124  if (argc != 4)
125  {
126  fprintf (stderr, "Usage: gen-fib <header|table> <limbbits> <nailbits>\n");
127  exit (1);
128  }
129 
130  limb_bits = atoi (argv[2]);
131  nail_bits = atoi (argv[3]);
132 
133  if (limb_bits <= 0
134  || nail_bits < 0
135  || nail_bits >= limb_bits)
136  {
137  fprintf (stderr, "Invalid limb/nail bits: %d %d\n",
138  limb_bits, nail_bits);
139  exit (1);
140  }
141  numb_bits = limb_bits - nail_bits;
142 
143  generate (numb_bits);
144 
145  if (strcmp (argv[1], "header") == 0)
146  header (numb_bits);
147  else if (strcmp (argv[1], "table") == 0)
148  table (numb_bits);
149  else
150  {
151  fprintf (stderr, "Invalid header/table choice: %s\n", argv[1]);
152  exit (1);
153  }
154 
155  return 0;
156 }
int strcmp()
Definition: coll.cpp:143
int printf()
int main(int argc, char *argv[])
Definition: gen-fib.c:120
int luc_limit
Definition: gen-fib.c:35
mpz_t * f
Definition: gen-fib.c:34
int fib_limit
Definition: gen-fib.c:35
int fnum
Definition: gen-fib.c:35
void generate(int numb_bits)
Definition: gen-fib.c:38
void header(int numb_bits)
Definition: gen-fib.c:81
void table(int numb_bits)
Definition: gen-fib.c:94
int limb_bits
#define mpz_init
Definition: gmp.h:851
#define mpz_clear
Definition: gmp.h:679
#define mpz_init2
Definition: gmp.h:854
#define mpz_add
Definition: gmp.h:628
__mpz_struct mpz_t[1]
Definition: gmp.h:164
#define mpz_init_set_ui
Definition: gmp.h:872
#define mpz_cmp
Definition: gmp.h:688
#define mpz_setbit
Definition: gmp.h:1038
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