93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/* Test mpz_sizeinbase.
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Copyright 2001, 2002 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 <stdlib.h>
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#include "gmp.h"
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#include "gmp-impl.h"
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#include "tests.h"
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#if 0
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/* Disabled due to the bogosity of trying to fake an _mp_d pointer to
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below an object. Has been seen to fail on a hppa system and on ia64. */
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/* Create a fake mpz consisting of just a single 1 bit, with totbits being
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the total number of bits, inclusive of that 1 bit. */
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void
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mpz_fake_bits (mpz_ptr z, unsigned long totbits)
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{
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static mp_limb_t n;
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unsigned long zero_bits, zero_limbs;
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zero_bits = totbits - 1;
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zero_limbs = zero_bits / GMP_NUMB_BITS;
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zero_bits %= GMP_NUMB_BITS;
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SIZ(z) = zero_limbs + 1;
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PTR(z) = (&n) - (SIZ(z) - 1);
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n = CNST_LIMB(1) << zero_bits;
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ASSERT_ALWAYS (mpz_sizeinbase (z, 2) == totbits);
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}
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/* This was seen to fail on a GNU/Linux powerpc32 with gcc 2.95.2,
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apparently due to a doubtful value of mp_bases[10].chars_per_bit_exactly
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(0X1.34413509F79FDP-2 whereas 0X1.34413509F79FFP-2 is believed correct).
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Presumably this is a glibc problem when gcc converts the decimal string
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in mp_bases.c, or maybe it's only a function of the rounding mode during
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compilation. */
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void
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check_sample (void)
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{
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unsigned long totbits = 198096465;
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int base = 10;
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size_t want = 59632979;
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size_t got;
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mpz_t z;
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mpz_fake_bits (z, totbits);
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got = mpz_sizeinbase (z, base);
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if (got != want)
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{
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printf ("mpz_sizeinbase\n");
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printf (" base %d\n", base);
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printf (" totbits %lu\n", totbits);
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printf (" got %u\n", got);
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printf (" want %u\n", want);
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abort ();
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}
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}
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#endif
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int
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main (void)
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{
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tests_start ();
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/* check_sample (); */
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tests_end ();
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exit (0);
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}
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