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/* Test file for l2b constants.
Copyright 2007-2020 Free Software Foundation, Inc.
Contributed by the AriC and Caramba projects, INRIA.
This file is part of the GNU MPFR Library.
The GNU MPFR 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 MPFR 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 MPFR Library; see the file COPYING.LESSER. If not, see
https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
/* Execute this program with an argument to generate code that initializes
the l2b constants. */
#include "mpfr-test.h"
/* Must be a multiple of 4 */
static const int bits2use[] = {8, 16, 32, 64, 96, 128, 256};
#define size_of_bits2use (numberof (bits2use))
static __mpfr_struct l2b[BASE_MAX-1][2];
static void
print_mpfr (mpfr_srcptr x, const char *name)
{
unsigned char temp[16]; /* buffer for the base-256 string */
unsigned char *ptr; /* pointer to its first non-zero byte */
int size; /* size of the string */
int i; /* bits2use index */
int j; /* output limb index */
int k; /* byte index (in output limb) */
int r; /* digit index, relative to ptr */
char prefix[12]; /* "0x" or "UINT64_C(0x" */
char suffix[2]; /* "" or ")" */
if (printf ("#if 0\n") < 0)
{ fprintf (stderr, "Error in printf\n"); exit (1); }
for (i = 0; i < size_of_bits2use; i++)
{
if (bits2use[i] == 64)
{
strcpy (prefix, "UINT64_C(0x");
strcpy (suffix, ")");
}
else
{
strcpy (prefix, "0x");
strcpy (suffix, "");
}
if (printf ("#elif GMP_NUMB_BITS == %d\n"
"const mp_limb_t %s__tab[] = { %s", bits2use[i], name,
prefix) < 0)
{ fprintf (stderr, "Error in printf\n"); exit (1); }
size = mpn_get_str (temp, 256, MPFR_MANT (x), MPFR_LIMB_SIZE (x));
MPFR_ASSERTN (size <= 16);
ptr = temp;
/* Skip leading zeros. */
while (*ptr == 0)
{
ptr++;
size--;
MPFR_ASSERTN (size > 0);
}
MPFR_ASSERTN (*ptr >= 128);
for (j = (MPFR_PREC (x) - 1) / bits2use[i]; j >= 0; j--)
{
r = j * (bits2use[i] / 8);
for (k = 0; k < bits2use[i] / 8; k++)
if (printf ("%02x", r < size ? ptr[r++] : 0) < 0)
{ fprintf (stderr, "Error in printf\n"); exit (1); }
if (j == 0 && printf ("%s };\n", suffix) < 0)
{ fprintf (stderr, "Error in printf\n"); exit (1); }
else if (j > 0 && printf ("%s, %s", suffix, prefix) < 0)
{ fprintf (stderr, "Error in printf\n"); exit (1); }
}
}
if (printf ("#endif\n\n") < 0)
{ fprintf (stderr, "Error in printf\n"); exit (1); }
}
static void
compute_l2b (int output)
{
mpfr_ptr p;
mpfr_srcptr t;
int beta, i;
int error = 0;
char buffer[256]; /* larger than needed, for maintainability */
if (output)
printf ("#ifndef UINT64_C\n# define UINT64_C(c) c\n#endif\n\n");
for (beta = 2; beta <= BASE_MAX; beta++)
{
for (i = 0; i < 2; i++)
{
p = &l2b[beta-2][i];
/* Compute the value */
if (i == 0)
{
/* 23-bit upper approximation to log(b)/log(2) */
mpfr_init2 (p, 23);
mpfr_set_ui (p, beta, MPFR_RNDU);
mpfr_log2 (p, p, MPFR_RNDU);
}
else
{
/* 77-bit upper approximation to log(2)/log(b) */
mpfr_init2 (p, 77);
mpfr_set_ui (p, beta, MPFR_RNDD);
mpfr_log2 (p, p, MPFR_RNDD);
mpfr_ui_div (p, 1, p, MPFR_RNDU);
}
sprintf (buffer, "mpfr_l2b_%d_%d", beta, i);
if (output)
print_mpfr (p, buffer);
/* Check the value */
t = &__gmpfr_l2b[beta-2][i];
if (t == NULL || MPFR_PREC (t) == 0 || !mpfr_equal_p (p, t))
{
if (!output)
{
error = 1;
printf ("Error for constant %s\n", buffer);
}
}
if (!output)
mpfr_clear (p);
}
}
if (output)
{
if (printf ("const __mpfr_struct __gmpfr_l2b[BASE_MAX-1][2] = {\n")
< 0)
{ fprintf (stderr, "Error in printf\n"); exit (1); }
for (beta = 2; beta <= BASE_MAX; beta++)
{
for (i = 0; i < 2; i++)
{
p = &l2b[beta-2][i];
if (printf (" %c {%3d,%2d,%3ld, (mp_limb_t *) "
"mpfr_l2b_%d_%d__tab }%s\n", i == 0 ? '{' : ' ',
(int) MPFR_PREC (p), MPFR_SIGN (p),
(long) MPFR_GET_EXP (p), beta, i,
i == 0 ? "," : beta < BASE_MAX ? " }," : " } };")
< 0)
{ fprintf (stderr, "Error in printf\n"); exit (1); }
mpfr_clear (p);
}
}
}
/* If there was an error, the test fails. */
if (error)
exit (1);
}
int
main (int argc, char *argv[])
{
if (argc != 1)
{
/* Generate code that initializes the l2b constants. */
compute_l2b (1);
}
else
{
/* Check the l2b constants. */
tests_start_mpfr ();
compute_l2b (0);
tests_end_mpfr ();
}
return 0;
}
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