1/* Test mpz_abs, mpz_add, mpz_cmp, mpz_cmp_ui, mpz_tdiv_qr, mpz_tdiv_q, 2 mpz_tdiv_r, mpz_mul. 3 4Copyright 1991, 1993, 1994, 1996, 1997, 2000, 2001 Free Software Foundation, Inc. 5 6This file is part of the GNU MP Library. 7 8The GNU MP Library is free software; you can redistribute it and/or modify 9it under the terms of the GNU Lesser General Public License as published by 10the Free Software Foundation; either version 3 of the License, or (at your 11option) any later version. 12 13The GNU MP Library is distributed in the hope that it will be useful, but 14WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 16License for more details. 17 18You should have received a copy of the GNU Lesser General Public License 19along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */ 20 21#include <stdio.h> 22#include <stdlib.h> 23 24#include "gmp.h" 25#include "gmp-impl.h" 26#include "tests.h" 27 28void dump_abort __GMP_PROTO ((mpz_t, mpz_t)); 29void debug_mp __GMP_PROTO ((mpz_t, int)); 30 31int 32main (int argc, char **argv) 33{ 34 mpz_t dividend, divisor; 35 mpz_t quotient, remainder; 36 mpz_t quotient2, remainder2; 37 mpz_t temp; 38 mp_size_t dividend_size, divisor_size; 39 int i; 40 int reps = 1000; 41 gmp_randstate_ptr rands; 42 mpz_t bs; 43 unsigned long bsi, size_range; 44 45 tests_start (); 46 TESTS_REPS (reps, argv, argc); 47 48 rands = RANDS; 49 50 mpz_init (bs); 51 52 mpz_init (dividend); 53 mpz_init (divisor); 54 mpz_init (quotient); 55 mpz_init (remainder); 56 mpz_init (quotient2); 57 mpz_init (remainder2); 58 mpz_init (temp); 59 60 for (i = 0; i < reps; i++) 61 { 62 mpz_urandomb (bs, rands, 32); 63 size_range = mpz_get_ui (bs) % 18 + 2; /* 0..524288 bit operands */ 64 65 do 66 { 67 mpz_urandomb (bs, rands, size_range); 68 divisor_size = mpz_get_ui (bs); 69 mpz_rrandomb (divisor, rands, divisor_size); 70 } 71 while (mpz_sgn (divisor) == 0); 72 73 mpz_urandomb (bs, rands, size_range); 74 dividend_size = mpz_get_ui (bs) + divisor_size; 75 mpz_rrandomb (dividend, rands, dividend_size); 76 77 mpz_urandomb (bs, rands, 2); 78 bsi = mpz_get_ui (bs); 79 if ((bsi & 1) != 0) 80 mpz_neg (dividend, dividend); 81 if ((bsi & 2) != 0) 82 mpz_neg (divisor, divisor); 83 84 /* printf ("%ld %ld\n", SIZ (dividend), SIZ (divisor)); */ 85 86 mpz_tdiv_qr (quotient, remainder, dividend, divisor); 87 mpz_tdiv_q (quotient2, dividend, divisor); 88 mpz_tdiv_r (remainder2, dividend, divisor); 89 90 /* First determine that the quotients and remainders computed 91 with different functions are equal. */ 92 if (mpz_cmp (quotient, quotient2) != 0) 93 dump_abort (dividend, divisor); 94 if (mpz_cmp (remainder, remainder2) != 0) 95 dump_abort (dividend, divisor); 96 97 /* Check if the sign of the quotient is correct. */ 98 if (mpz_cmp_ui (quotient, 0) != 0) 99 if ((mpz_cmp_ui (quotient, 0) < 0) 100 != ((mpz_cmp_ui (dividend, 0) ^ mpz_cmp_ui (divisor, 0)) < 0)) 101 dump_abort (dividend, divisor); 102 103 /* Check if the remainder has the same sign as the dividend 104 (quotient rounded towards 0). */ 105 if (mpz_cmp_ui (remainder, 0) != 0) 106 if ((mpz_cmp_ui (remainder, 0) < 0) != (mpz_cmp_ui (dividend, 0) < 0)) 107 dump_abort (dividend, divisor); 108 109 mpz_mul (temp, quotient, divisor); 110 mpz_add (temp, temp, remainder); 111 if (mpz_cmp (temp, dividend) != 0) 112 dump_abort (dividend, divisor); 113 114 mpz_abs (temp, divisor); 115 mpz_abs (remainder, remainder); 116 if (mpz_cmp (remainder, temp) >= 0) 117 dump_abort (dividend, divisor); 118 } 119 120 mpz_clear (bs); 121 mpz_clear (dividend); 122 mpz_clear (divisor); 123 mpz_clear (quotient); 124 mpz_clear (remainder); 125 mpz_clear (quotient2); 126 mpz_clear (remainder2); 127 mpz_clear (temp); 128 129 tests_end (); 130 exit (0); 131} 132 133void 134dump_abort (mpz_t dividend, mpz_t divisor) 135{ 136 fprintf (stderr, "ERROR\n"); 137 fprintf (stderr, "dividend = "); debug_mp (dividend, -16); 138 fprintf (stderr, "divisor = "); debug_mp (divisor, -16); 139 abort(); 140} 141 142void 143debug_mp (mpz_t x, int base) 144{ 145 mpz_out_str (stderr, base, x); fputc ('\n', stderr); 146} 147