156 lines
4.5 KiB
C
156 lines
4.5 KiB
C
/* Test mpz_fib_ui and mpz_fib2_ui.
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Copyright 2000-2002 Free Software Foundation, Inc.
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This file is part of the GNU MP Library test suite.
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The GNU MP Library test suite is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 3 of the License,
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or (at your option) any later version.
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The GNU MP Library test suite is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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Public License for more details.
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You should have received a copy of the GNU General Public License along with
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the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
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#include <stdio.h>
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#include <stdlib.h>
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#include "gmp-impl.h"
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#include "tests.h"
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/* Usage: t-fib_ui [x|num]
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Run with no arguments, tests goes up to the initial value of "limit"
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below. With a number argument tests are carried up that far, or with a
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literal "x" tests are continued without limit (this being only meant for
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development purposes).
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The size tests performed are designed to partially replicate what will be
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going on in mpz_fib_ui. There's plenty of ASSERTs there, but of course
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they're not normally enabled.
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Misfeatures:
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The tests on MPN_FIB2_SIZE are a bit useless, since that macro includes a
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+2 for the internal purposes of mpn_fib2_ui. It's probably better to
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give mpn_fib2_ui a run with assertion checking enabled. */
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#define MPZ_FIB_SIZE_FLOAT(n) \
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((mp_size_t) ((n) * 0.6942419 / GMP_NUMB_BITS + 1))
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void
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check_fib_table (void)
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{
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int i;
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mp_limb_t want;
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ASSERT_ALWAYS (FIB_TABLE(-1) == 1);
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ASSERT_ALWAYS (FIB_TABLE(0) == 0);
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for (i = 1; i <= FIB_TABLE_LIMIT; i++)
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{
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want = FIB_TABLE(i-1) + FIB_TABLE(i-2);
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if (FIB_TABLE(i) != want)
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{
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printf ("FIB_TABLE(%d) wrong\n", i);
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gmp_printf (" got %#Nx\n", &FIB_TABLE(i), 1);
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gmp_printf (" want %#Nx\n", &want, 1);
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abort ();
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}
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}
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}
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int
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main (int argc, char *argv[])
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{
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unsigned long n;
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unsigned long limit = 100 * GMP_LIMB_BITS;
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mpz_t want_fn, want_fn1, got_fn, got_fn1;
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tests_start ();
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mp_trace_base = -16;
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if (argc > 1 && argv[1][0] == 'x')
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limit = ULONG_MAX;
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else
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TESTS_REPS (limit, argv, argc);
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check_fib_table ();
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/* start at n==0 */
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mpz_init_set_ui (want_fn1, 1); /* F[-1] */
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mpz_init_set_ui (want_fn, 0); /* F[0] */
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mpz_init (got_fn);
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mpz_init (got_fn1);
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for (n = 0; n < limit; n++)
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{
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/* check our float formula seems right */
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if (MPZ_FIB_SIZE_FLOAT (n) < SIZ(want_fn))
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{
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printf ("MPZ_FIB_SIZE_FLOAT wrong at n=%lu\n", n);
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printf (" MPZ_FIB_SIZE_FLOAT %ld\n", MPZ_FIB_SIZE_FLOAT (n));
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printf (" SIZ(want_fn) %d\n", SIZ(want_fn));
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abort ();
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}
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/* check MPN_FIB2_SIZE seems right, compared to actual size and
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compared to our float formula */
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if (MPN_FIB2_SIZE (n) < MPZ_FIB_SIZE_FLOAT (n))
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{
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printf ("MPN_FIB2_SIZE wrong at n=%lu\n", n);
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printf (" MPN_FIB2_SIZE %ld\n", MPN_FIB2_SIZE (n));
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printf (" MPZ_FIB_SIZE_FLOAT %ld\n", MPZ_FIB_SIZE_FLOAT (n));
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abort ();
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}
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if (MPN_FIB2_SIZE (n) < SIZ(want_fn))
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{
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printf ("MPN_FIB2_SIZE wrong at n=%lu\n", n);
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printf (" MPN_FIB2_SIZE %ld\n", MPN_FIB2_SIZE (n));
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printf (" SIZ(want_fn) %d\n", SIZ(want_fn));
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abort ();
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}
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mpz_fib2_ui (got_fn, got_fn1, n);
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MPZ_CHECK_FORMAT (got_fn);
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MPZ_CHECK_FORMAT (got_fn1);
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if (mpz_cmp (got_fn, want_fn) != 0 || mpz_cmp (got_fn1, want_fn1) != 0)
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{
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printf ("mpz_fib2_ui(%lu) wrong\n", n);
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mpz_trace ("want fn ", want_fn);
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mpz_trace ("got fn ", got_fn);
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mpz_trace ("want fn1", want_fn1);
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mpz_trace ("got fn1", got_fn1);
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abort ();
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}
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mpz_fib_ui (got_fn, n);
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MPZ_CHECK_FORMAT (got_fn);
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if (mpz_cmp (got_fn, want_fn) != 0)
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{
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printf ("mpz_fib_ui(%lu) wrong\n", n);
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mpz_trace ("want fn", want_fn);
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mpz_trace ("got fn", got_fn);
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abort ();
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}
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mpz_add (want_fn1, want_fn1, want_fn); /* F[n+1] = F[n] + F[n-1] */
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mpz_swap (want_fn1, want_fn);
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}
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mpz_clear (want_fn);
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mpz_clear (want_fn1);
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mpz_clear (got_fn);
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mpz_clear (got_fn1);
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tests_end ();
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exit (0);
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}
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