Viewing file:  t-fdiv_ui.c (4.61 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* Test mpz_abs, mpz_add, mpz_cmp, mpz_cmp_ui, mpz_fdiv_qr_ui, mpz_fdiv_q_ui,
mpz_fdiv_r_ui, mpz_fdiv_ui, mpz_mul_ui.
Copyright 1993, 1994, 1996, 2000-2002 Free Software Foundation, Inc.
This file is part of the GNU MP Library test suite.
The GNU MP Library test suite is free software; you can redistribute it
and/or modify it under the terms of the GNU 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 test suite 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 General
Public License for more details.
You should have received a copy of the GNU General Public License along with
the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
#include <stdio.h>
#include <stdlib.h>
#include "gmp-impl.h"
#include "tests.h"
void dump_abort (const char *, mpz_t, unsigned long);
void debug_mp (mpz_t, int);
int
main (int argc, char **argv)
{
mpz_t dividend;
mpz_t quotient, remainder;
mpz_t quotient2, remainder2;
mpz_t temp;
mp_size_t dividend_size;
unsigned long divisor;
int i;
int reps = 10000;
gmp_randstate_ptr rands;
mpz_t bs;
unsigned long bsi, size_range;
unsigned long r_rq, r_q, r_r, r;
tests_start ();
rands = RANDS;
mpz_init (bs);
if (argc == 2)
reps = atoi (argv[1]);
mpz_init (dividend);
mpz_init (quotient);
mpz_init (remainder);
mpz_init (quotient2);
mpz_init (remainder2);
mpz_init (temp);
for (i = 0; i < reps; i++)
{
mpz_urandomb (bs, rands, 32);
size_range = mpz_get_ui (bs) % 10 + 2; /* 0..2047 bit operands */
do
{
mpz_rrandomb (bs, rands, 64);
divisor = mpz_get_ui (bs);
}
while (divisor == 0);
mpz_urandomb (bs, rands, size_range);
dividend_size = mpz_get_ui (bs);
mpz_rrandomb (dividend, rands, dividend_size);
mpz_urandomb (bs, rands, 2);
bsi = mpz_get_ui (bs);
if ((bsi & 1) != 0)
mpz_neg (dividend, dividend);
/* printf ("%ld\n", SIZ (dividend)); */
r_rq = mpz_fdiv_qr_ui (quotient, remainder, dividend, divisor);
r_q = mpz_fdiv_q_ui (quotient2, dividend, divisor);
r_r = mpz_fdiv_r_ui (remainder2, dividend, divisor);
r = mpz_fdiv_ui (dividend, divisor);
/* First determine that the quotients and remainders computed
with different functions are equal. */
if (mpz_cmp (quotient, quotient2) != 0)
dump_abort ("quotients from mpz_fdiv_qr_ui and mpz_fdiv_q_ui differ",
dividend, divisor);
if (mpz_cmp (remainder, remainder2) != 0)
dump_abort ("remainders from mpz_fdiv_qr_ui and mpz_fdiv_r_ui differ",
dividend, divisor);
/* Check if the sign of the quotient is correct. */
if (mpz_cmp_ui (quotient, 0) != 0)
if ((mpz_cmp_ui (quotient, 0) < 0)
!= (mpz_cmp_ui (dividend, 0) < 0))
dump_abort ("quotient sign wrong", dividend, divisor);
/* Check if the remainder has the same sign as the (positive) divisor
(quotient rounded towards minus infinity). */
if (mpz_cmp_ui (remainder, 0) != 0)
if (mpz_cmp_ui (remainder, 0) < 0)
dump_abort ("remainder sign wrong", dividend, divisor);
mpz_mul_ui (temp, quotient, divisor);
mpz_add (temp, temp, remainder);
if (mpz_cmp (temp, dividend) != 0)
dump_abort ("n mod d != n - [n/d]*d", dividend, divisor);
mpz_abs (remainder, remainder);
if (mpz_cmp_ui (remainder, divisor) >= 0)
dump_abort ("remainder greater than divisor", dividend, divisor);
if (mpz_cmp_ui (remainder, r_rq) != 0)
dump_abort ("remainder returned from mpz_fdiv_qr_ui is wrong",
dividend, divisor);
if (mpz_cmp_ui (remainder, r_q) != 0)
dump_abort ("remainder returned from mpz_fdiv_q_ui is wrong",
dividend, divisor);
if (mpz_cmp_ui (remainder, r_r) != 0)
dump_abort ("remainder returned from mpz_fdiv_r_ui is wrong",
dividend, divisor);
if (mpz_cmp_ui (remainder, r) != 0)
dump_abort ("remainder returned from mpz_fdiv_ui is wrong",
dividend, divisor);
}
mpz_clear (bs);
mpz_clear (dividend);
mpz_clear (quotient);
mpz_clear (remainder);
mpz_clear (quotient2);
mpz_clear (remainder2);
mpz_clear (temp);
tests_end ();
exit (0);
}
void
dump_abort (const char *str, mpz_t dividend, unsigned long divisor)
{
fprintf (stderr, "ERROR: %s\n", str);
fprintf (stderr, "dividend = "); debug_mp (dividend, -16);
fprintf (stderr, "divisor = %lX\n", divisor);
abort();
}
void
debug_mp (mpz_t x, int base)
{
mpz_out_str (stderr, base, x); fputc ('\n', stderr);
}
|
