141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
/* cre-conv-tab.c -- Create conversion table in a wordsize-dependent way.
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$Id$
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Copyright (C) 1991 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 General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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The GNU MP Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the GNU MP Library; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include <math.h>
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#include "gmp.h"
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#include "gmp-impl.h"
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#include "longlong.h"
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static unsigned long int
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upow (unsigned long int b, unsigned int e)
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{
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unsigned long int y = 1;
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while (e != 0)
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{
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while ((e & 1) == 0)
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{
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b = b * b;
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e >>= 1;
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}
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y = y * b;
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e -= 1;
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}
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return y;
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}
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unsigned int
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ulog2 (unsigned long int x)
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{
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unsigned int i;
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for (i = 0; x != 0; i++)
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x >>= 1;
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return i;
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}
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void
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main (void)
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{
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int i;
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unsigned long idig;
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unsigned long big_base, big_base_inverted;
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double fdig;
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int dummy;
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int normalization_steps;
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unsigned long int max_uli;
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int bits_uli;
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max_uli = 1;
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for (i = 1; ; i++)
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{
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if ((max_uli << 1) == 0)
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break;
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max_uli <<= 1;
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}
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bits_uli = i;
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puts ("/* __mp_bases -- Structure for conversion between internal binary");
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puts (" format and strings in base 2..36. The fields are explained in");
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puts (" gmp-impl.h.");
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puts ("");
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puts (" ***** THIS FILE WAS CREATED BY A PROGRAM. DON'T EDIT IT! *****");
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puts ("");
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puts ("Copyright (C) 1991 Free Software Foundation, Inc.");
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puts ("");
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puts ("This file is part of the GNU MP Library.");
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puts ("");
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puts ("The GNU MP Library is free software; you can redistribute it and/or");
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puts ("modify it under the terms of the GNU General Public License as");
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puts ("published by the Free Software Foundation; either version 2, or");
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puts ("(at your option) any later version.");
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puts ("");
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puts ("The GNU MP Library is distributed in the hope that it will be");
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puts ("useful, but WITHOUT ANY WARRANTY; without even the implied warranty");
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puts ("of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the");
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puts ("GNU General Public License for more details.");
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puts ("");
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puts ("You should have received a copy of the GNU General Public License");
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puts ("along with the GNU MP Library; see the file COPYING. If not, write");
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puts ("to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,");
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puts ("USA. */");
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puts ("");
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puts ("#include \"gmp.h\"");
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puts ("#include \"gmp-impl.h\"");
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puts ("");
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puts ("const struct bases __mp_bases[37] =\n{");
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puts (" /* 0 */ {0, 0, 0, 0.0},");
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puts (" /* 1 */ {0, 0, 0, 0.0},");
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for (i = 2; i <= 36; i++)
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{
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/* The weird expression here is because many /bin/cc compilers
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generate incorrect code for conversions from large unsigned
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integers to double. */
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fdig = log(2.0)/log((double) i);
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idig = floor(bits_uli * fdig);
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if ((i & (i - 1)) == 0)
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{
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big_base = ulog2 (i) - 1;
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big_base_inverted = 0;
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}
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else
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{
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big_base = upow (i, idig);
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for (normalization_steps = 0;
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(long int) (big_base << normalization_steps) >= 0;
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normalization_steps++)
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;
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udiv_qrnnd (big_base_inverted, dummy,
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-(big_base << normalization_steps), 0,
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big_base << normalization_steps);
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}
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printf (" /* %2u */ {%lu, 0x%lX, 0x%lX, %.8f},\n",
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i, idig, big_base, big_base_inverted, fdig);
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}
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puts ("};");
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exit (0);
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}
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