1/* Test mpz_abs, mpz_add, mpz_cmp, mpz_cmp_ui, mpz_fdiv_qr, mpz_fdiv_q, 2 mpz_fdiv_r, mpz_mul. 3 4Copyright 1993, 1994, 1996, 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 rands = RANDS; 47 48 mpz_init (bs); 49 50 if (argc == 2) 51 reps = atoi (argv[1]); 52 53 mpz_init (dividend); 54 mpz_init (divisor); 55 mpz_init (quotient); 56 mpz_init (remainder); 57 mpz_init (quotient2); 58 mpz_init (remainder2); 59 mpz_init (temp); 60 61 for (i = 0; i < reps; i++) 62 { 63 mpz_urandomb (bs, rands, 32); 64 size_range = mpz_get_ui (bs) % 16 + 2; /* 0..131071 bit operands */ 65 66 do 67 { 68 mpz_urandomb (bs, rands, size_range); 69 divisor_size = mpz_get_ui (bs); 70 mpz_rrandomb (divisor, rands, divisor_size); 71 } 72 while (mpz_sgn (divisor) == 0); 73 74 mpz_urandomb (bs, rands, size_range); 75 dividend_size = mpz_get_ui (bs) + divisor_size; 76 mpz_rrandomb (dividend, rands, dividend_size); 77 78 mpz_urandomb (bs, rands, 2); 79 bsi = mpz_get_ui (bs); 80 if ((bsi & 1) != 0) 81 mpz_neg (dividend, dividend); 82 if ((bsi & 2) != 0) 83 mpz_neg (divisor, divisor); 84 85 /* printf ("%ld %ld\n", SIZ (dividend), SIZ (divisor)); */ 86 87 mpz_fdiv_qr (quotient, remainder, dividend, divisor); 88 mpz_fdiv_q (quotient2, dividend, divisor); 89 mpz_fdiv_r (remainder2, dividend, divisor); 90 91 /* First determine that the quotients and remainders computed 92 with different functions are equal. */ 93 if (mpz_cmp (quotient, quotient2) != 0) 94 dump_abort (dividend, divisor); 95 if (mpz_cmp (remainder, remainder2) != 0) 96 dump_abort (dividend, divisor); 97 98 /* Check if the sign of the quotient is correct. */ 99 if (mpz_cmp_ui (quotient, 0) != 0) 100 if ((mpz_cmp_ui (quotient, 0) < 0) 101 != ((mpz_cmp_ui (dividend, 0) ^ mpz_cmp_ui (divisor, 0)) < 0)) 102 dump_abort (dividend, divisor); 103 104 /* Check if the remainder has the same sign as the divisor 105 (quotient rounded towards minus infinity). */ 106 if (mpz_cmp_ui (remainder, 0) != 0) 107 if ((mpz_cmp_ui (remainder, 0) < 0) != (mpz_cmp_ui (divisor, 0) < 0)) 108 dump_abort (dividend, divisor); 109 110 mpz_mul (temp, quotient, divisor); 111 mpz_add (temp, temp, remainder); 112 if (mpz_cmp (temp, dividend) != 0) 113 dump_abort (dividend, divisor); 114 115 mpz_abs (temp, divisor); 116 mpz_abs (remainder, remainder); 117 if (mpz_cmp (remainder, temp) >= 0) 118 dump_abort (dividend, divisor); 119 } 120 121 mpz_clear (bs); 122 mpz_clear (dividend); 123 mpz_clear (divisor); 124 mpz_clear (quotient); 125 mpz_clear (remainder); 126 mpz_clear (quotient2); 127 mpz_clear (remainder2); 128 mpz_clear (temp); 129 130 tests_end (); 131 exit (0); 132} 133 134void 135dump_abort (mpz_t dividend, mpz_t divisor) 136{ 137 fprintf (stderr, "ERROR\n"); 138 fprintf (stderr, "dividend = "); debug_mp (dividend, -16); 139 fprintf (stderr, "divisor = "); debug_mp (divisor, -16); 140 abort(); 141} 142 143void 144debug_mp (mpz_t x, int base) 145{ 146 mpz_out_str (stderr, base, x); fputc ('\n', stderr); 147} 148