t-fdiv_ui.c revision 1.1.1.1
1/* Test mpz_abs, mpz_add, mpz_cmp, mpz_cmp_ui, mpz_fdiv_qr_ui, mpz_fdiv_q_ui, 2 mpz_fdiv_r_ui, mpz_fdiv_ui, mpz_mul_ui. 3 4Copyright 1993, 1994, 1996, 2000, 2001, 2002 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 ((char *, mpz_t, unsigned long)); 29void debug_mp __GMP_PROTO ((mpz_t, int)); 30 31int 32main (int argc, char **argv) 33{ 34 mpz_t dividend; 35 mpz_t quotient, remainder; 36 mpz_t quotient2, remainder2; 37 mpz_t temp; 38 mp_size_t dividend_size; 39 unsigned long divisor; 40 int i; 41 int reps = 10000; 42 gmp_randstate_ptr rands; 43 mpz_t bs; 44 unsigned long bsi, size_range; 45 unsigned long r_rq, r_q, r_r, r; 46 47 tests_start (); 48 rands = RANDS; 49 50 mpz_init (bs); 51 52 if (argc == 2) 53 reps = atoi (argv[1]); 54 55 mpz_init (dividend); 56 mpz_init (quotient); 57 mpz_init (remainder); 58 mpz_init (quotient2); 59 mpz_init (remainder2); 60 mpz_init (temp); 61 62 for (i = 0; i < reps; i++) 63 { 64 mpz_urandomb (bs, rands, 32); 65 size_range = mpz_get_ui (bs) % 10 + 2; /* 0..2047 bit operands */ 66 67 do 68 { 69 mpz_rrandomb (bs, rands, 64); 70 divisor = mpz_get_ui (bs); 71 } 72 while (divisor == 0); 73 74 mpz_urandomb (bs, rands, size_range); 75 dividend_size = mpz_get_ui (bs); 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 83 /* printf ("%ld\n", SIZ (dividend)); */ 84 85 r_rq = mpz_fdiv_qr_ui (quotient, remainder, dividend, divisor); 86 r_q = mpz_fdiv_q_ui (quotient2, dividend, divisor); 87 r_r = mpz_fdiv_r_ui (remainder2, dividend, divisor); 88 r = mpz_fdiv_ui (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 ("quotients from mpz_fdiv_qr_ui and mpz_fdiv_q_ui differ", 94 dividend, divisor); 95 if (mpz_cmp (remainder, remainder2) != 0) 96 dump_abort ("remainders from mpz_fdiv_qr_ui and mpz_fdiv_r_ui differ", 97 dividend, divisor); 98 99 /* Check if the sign of the quotient is correct. */ 100 if (mpz_cmp_ui (quotient, 0) != 0) 101 if ((mpz_cmp_ui (quotient, 0) < 0) 102 != (mpz_cmp_ui (dividend, 0) < 0)) 103 dump_abort ("quotient sign wrong", dividend, divisor); 104 105 /* Check if the remainder has the same sign as the (positive) divisor 106 (quotient rounded towards minus infinity). */ 107 if (mpz_cmp_ui (remainder, 0) != 0) 108 if (mpz_cmp_ui (remainder, 0) < 0) 109 dump_abort ("remainder sign wrong", dividend, divisor); 110 111 mpz_mul_ui (temp, quotient, divisor); 112 mpz_add (temp, temp, remainder); 113 if (mpz_cmp (temp, dividend) != 0) 114 dump_abort ("n mod d != n - [n/d]*d", dividend, divisor); 115 116 mpz_abs (remainder, remainder); 117 if (mpz_cmp_ui (remainder, divisor) >= 0) 118 dump_abort ("remainder greater than divisor", dividend, divisor); 119 120 if (mpz_cmp_ui (remainder, r_rq) != 0) 121 dump_abort ("remainder returned from mpz_fdiv_qr_ui is wrong", 122 dividend, divisor); 123 if (mpz_cmp_ui (remainder, r_q) != 0) 124 dump_abort ("remainder returned from mpz_fdiv_q_ui is wrong", 125 dividend, divisor); 126 if (mpz_cmp_ui (remainder, r_r) != 0) 127 dump_abort ("remainder returned from mpz_fdiv_r_ui is wrong", 128 dividend, divisor); 129 if (mpz_cmp_ui (remainder, r) != 0) 130 dump_abort ("remainder returned from mpz_fdiv_ui is wrong", 131 dividend, divisor); 132 } 133 134 mpz_clear (bs); 135 mpz_clear (dividend); 136 mpz_clear (quotient); 137 mpz_clear (remainder); 138 mpz_clear (quotient2); 139 mpz_clear (remainder2); 140 mpz_clear (temp); 141 142 tests_end (); 143 exit (0); 144} 145 146void 147dump_abort (char *str, mpz_t dividend, unsigned long divisor) 148{ 149 fprintf (stderr, "ERROR: %s\n", str); 150 fprintf (stderr, "dividend = "); debug_mp (dividend, -16); 151 fprintf (stderr, "divisor = %lX\n", divisor); 152 abort(); 153} 154 155void 156debug_mp (mpz_t x, int base) 157{ 158 mpz_out_str (stderr, base, x); fputc ('\n', stderr); 159} 160