--- /dev/null
+/* Test mpq_get_d and mpq_set_d
+
+Copyright 1991, 1993, 1994, 1996, 2000, 2001, 2002, 2003 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"
+
+#ifndef SIZE
+#define SIZE 8
+#endif
+
+/* VAX D floats only have an 8 bit signed exponent, so anything 2^128 or
+ bigger will overflow, that being 4 limbs. */
+#if defined (__vax__) && SIZE > 4
+#undef SIZE
+#define SIZE 4
+#define EPSIZE 3
+#else
+#define EPSIZE SIZE
+#endif
+
+void dump __GMP_PROTO ((mpq_t));
+
+void
+check_monotonic (int argc, char **argv)
+{
+ mpq_t a;
+ mp_size_t size;
+ int reps = 100;
+ int i, j;
+ double last_d, new_d;
+ mpq_t qlast_d, qnew_d;
+ mpq_t eps;
+
+ if (argc == 2)
+ reps = atoi (argv[1]);
+
+ /* The idea here is to test the monotonousness of mpq_get_d by adding
+ numbers to the numerator and denominator. */
+
+ mpq_init (a);
+ mpq_init (eps);
+ mpq_init (qlast_d);
+ mpq_init (qnew_d);
+
+ for (i = 0; i < reps; i++)
+ {
+ size = urandom () % SIZE - SIZE/2;
+ mpz_random2 (mpq_numref (a), size);
+ do
+ {
+ size = urandom () % SIZE - SIZE/2;
+ mpz_random2 (mpq_denref (a), size);
+ }
+ while (mpz_cmp_ui (mpq_denref (a), 0) == 0);
+
+ mpq_canonicalize (a);
+
+ last_d = mpq_get_d (a);
+ mpq_set_d (qlast_d, last_d);
+ for (j = 0; j < 10; j++)
+ {
+ size = urandom () % EPSIZE + 1;
+ mpz_random2 (mpq_numref (eps), size);
+ size = urandom () % EPSIZE + 1;
+ mpz_random2 (mpq_denref (eps), size);
+ mpq_canonicalize (eps);
+
+ mpq_add (a, a, eps);
+ mpq_canonicalize (a);
+ new_d = mpq_get_d (a);
+ if (last_d > new_d)
+ {
+ printf ("\nERROR (test %d/%d): bad mpq_get_d results\n", i, j);
+ printf ("last: %.16g\n", last_d);
+ printf (" new: %.16g\n", new_d); dump (a);
+ abort ();
+ }
+ mpq_set_d (qnew_d, new_d);
+ MPQ_CHECK_FORMAT (qnew_d);
+ if (mpq_cmp (qlast_d, qnew_d) > 0)
+ {
+ printf ("ERROR (test %d/%d): bad mpq_set_d results\n", i, j);
+ printf ("last: %.16g\n", last_d); dump (qlast_d);
+ printf (" new: %.16g\n", new_d); dump (qnew_d);
+ abort ();
+ }
+ last_d = new_d;
+ mpq_set (qlast_d, qnew_d);
+ }
+ }
+
+ mpq_clear (a);
+ mpq_clear (eps);
+ mpq_clear (qlast_d);
+ mpq_clear (qnew_d);
+}
+
+double
+my_ldexp (double d, int e)
+{
+ for (;;)
+ {
+ if (e > 0)
+ {
+ if (e >= 16)
+ {
+ d *= 65536.0;
+ e -= 16;
+ }
+ else
+ {
+ d *= 2.0;
+ e -= 1;
+ }
+ }
+ else if (e < 0)
+ {
+
+ if (e <= -16)
+ {
+ d /= 65536.0;
+ e += 16;
+ }
+ else
+ {
+ d /= 2.0;
+ e += 1;
+ }
+ }
+ else
+ return d;
+ }
+}
+
+void
+check_random (int argc, char **argv)
+{
+ double d, d2, nd, dd;
+ mpq_t q;
+ mp_limb_t rp[LIMBS_PER_DOUBLE + 1];
+ int test, reps = 100000;
+ int i;
+
+ if (argc == 2)
+ reps = 100 * atoi (argv[1]);
+
+ mpq_init (q);
+
+ for (test = 0; test < reps; test++)
+ {
+ mpn_random2 (rp, LIMBS_PER_DOUBLE + 1);
+ d = 0.0;
+ for (i = LIMBS_PER_DOUBLE - 1; i >= 0; i--)
+ d = d * MP_BASE_AS_DOUBLE + rp[i];
+ d = my_ldexp (d, (int) (rp[LIMBS_PER_DOUBLE] % 1000) - 500);
+ mpq_set_d (q, d);
+ nd = mpz_get_d (mpq_numref (q));
+ dd = mpz_get_d (mpq_denref (q));
+ d2 = nd / dd;
+ if (d != d2)
+ {
+ printf ("ERROR (check_random test %d): bad mpq_set_d results\n", test);
+ printf ("%.16g\n", d);
+ printf ("%.16g\n", d2);
+ abort ();
+ }
+ }
+ mpq_clear (q);
+}
+
+void
+dump (mpq_t x)
+{
+ mpz_out_str (stdout, 10, mpq_numref (x));
+ printf ("/");
+ mpz_out_str (stdout, 10, mpq_denref (x));
+ printf ("\n");
+}
+
+/* Check various values 2^n and 1/2^n. */
+void
+check_onebit (void)
+{
+ static const long data[] = {
+ -3*GMP_NUMB_BITS-1, -3*GMP_NUMB_BITS, -3*GMP_NUMB_BITS+1,
+ -2*GMP_NUMB_BITS-1, -2*GMP_NUMB_BITS, -2*GMP_NUMB_BITS+1,
+ -GMP_NUMB_BITS-1, -GMP_NUMB_BITS, -GMP_NUMB_BITS+1,
+ -5, -2, -1, 0, 1, 2, 5,
+ GMP_NUMB_BITS-1, GMP_NUMB_BITS, GMP_NUMB_BITS+1,
+ 2*GMP_NUMB_BITS-1, 2*GMP_NUMB_BITS, 2*GMP_NUMB_BITS+1,
+ 3*GMP_NUMB_BITS-1, 3*GMP_NUMB_BITS, 3*GMP_NUMB_BITS+1,
+ };
+
+ int i, neg;
+ long exp, l;
+ mpq_t q;
+ double got, want;
+
+ mpq_init (q);
+
+ for (i = 0; i < numberof (data); i++)
+ {
+ exp = data[i];
+
+ mpq_set_ui (q, 1L, 1L);
+ if (exp >= 0)
+ mpq_mul_2exp (q, q, exp);
+ else
+ mpq_div_2exp (q, q, -exp);
+
+ want = 1.0;
+ for (l = 0; l < exp; l++)
+ want *= 2.0;
+ for (l = 0; l > exp; l--)
+ want /= 2.0;
+
+ for (neg = 0; neg <= 1; neg++)
+ {
+ if (neg)
+ {
+ mpq_neg (q, q);
+ want = -want;
+ }
+
+ got = mpq_get_d (q);
+
+ if (got != want)
+ {
+ printf ("mpq_get_d wrong on %s2**%ld\n", neg ? "-" : "", exp);
+ mpq_trace (" q ", q);
+ d_trace (" want ", want);
+ d_trace (" got ", got);
+ abort();
+ }
+ }
+ }
+ mpq_clear (q);
+}
+
+int
+main (int argc, char **argv)
+{
+ tests_start ();
+
+ check_onebit ();
+ check_monotonic (argc, argv);
+ check_random (argc, argv);
+
+ tests_end ();
+ exit (0);
+}
projects / msp430-gcc.git / blobdiff