t-sizeinbase.c
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上传日期:2022-08-06
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- /* Test mpz_sizeinbase.
- Copyright 2001, 2002 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP 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 MP 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 MP Library. If not, see http://www.gnu.org/licenses/. */
- #include <stdio.h>
- #include <stdlib.h>
- #include "gmp.h"
- #include "gmp-impl.h"
- #include "tests.h"
- #if 0
- /* Disabled due to the bogosity of trying to fake an _mp_d pointer to
- below an object. Has been seen to fail on a hppa system and on ia64. */
- /* Create a fake mpz consisting of just a single 1 bit, with totbits being
- the total number of bits, inclusive of that 1 bit. */
- void
- mpz_fake_bits (mpz_ptr z, unsigned long totbits)
- {
- static mp_limb_t n;
- unsigned long zero_bits, zero_limbs;
- zero_bits = totbits - 1;
- zero_limbs = zero_bits / GMP_NUMB_BITS;
- zero_bits %= GMP_NUMB_BITS;
- SIZ(z) = zero_limbs + 1;
- PTR(z) = (&n) - (SIZ(z) - 1);
- n = CNST_LIMB(1) << zero_bits;
- ASSERT_ALWAYS (mpz_sizeinbase (z, 2) == totbits);
- }
- /* This was seen to fail on a GNU/Linux powerpc32 with gcc 2.95.2,
- apparently due to a doubtful value of mp_bases[10].chars_per_bit_exactly
- (0X1.34413509F79FDP-2 whereas 0X1.34413509F79FFP-2 is believed correct).
- Presumably this is a glibc problem when gcc converts the decimal string
- in mp_bases.c, or maybe it's only a function of the rounding mode during
- compilation. */
- void
- check_sample (void)
- {
- unsigned long totbits = 198096465;
- int base = 10;
- size_t want = 59632979;
- size_t got;
- mpz_t z;
- mpz_fake_bits (z, totbits);
- got = mpz_sizeinbase (z, base);
- if (got != want)
- {
- printf ("mpz_sizeinbasen");
- printf (" base %dn", base);
- printf (" totbits %lun", totbits);
- printf (" got %un", got);
- printf (" want %un", want);
- abort ();
- }
- }
- #endif
- int
- main (void)
- {
- tests_start ();
- /* check_sample (); */
- tests_end ();
- exit (0);
- }