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152 lines
3.6 KiB
C
152 lines
3.6 KiB
C
/* Test for mpn_invert function.
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Contributed to the GNU project by Marco Bodrato.
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Copyright 2009 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 <stdlib.h>
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#include <stdio.h>
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#include "gmp-impl.h"
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#include "tests.h"
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/* Sizes are up to 2^SIZE_LOG limbs */
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#ifndef SIZE_LOG
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#define SIZE_LOG 12
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#endif
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#ifndef COUNT
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#define COUNT 1000
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#endif
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#define MAX_N (1L << SIZE_LOG)
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#define MIN_N 1
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static int
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invert_valid (mp_srcptr ip, mp_srcptr dp, mp_size_t n)
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{
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mp_ptr tp;
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int cy;
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TMP_DECL;
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TMP_MARK;
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tp = TMP_ALLOC_LIMBS (2*n);
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refmpn_mul (tp, ip, n, dp, n);
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cy = refmpn_add_n (tp + n, tp + n, dp, n); /* This must not give a carry. */
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cy -= refmpn_add (tp, tp, 2*n, dp, n); /* This must give a carry. */
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TMP_FREE;
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return (cy == -1);
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}
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/*
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Check the result of the mpn_invert function in the library.
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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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mp_ptr ip, dp, scratch;
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int count = COUNT;
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int test;
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gmp_randstate_ptr rands;
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TMP_DECL;
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TMP_MARK;
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TESTS_REPS (count, argv, argc);
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tests_start ();
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rands = RANDS;
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dp = TMP_ALLOC_LIMBS (MAX_N);
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ip = 1+TMP_ALLOC_LIMBS (MAX_N + 2);
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scratch
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= 1+TMP_ALLOC_LIMBS (mpn_invert_itch (MAX_N) + 2);
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for (test = 0; test < count; test++)
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{
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unsigned size_min;
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unsigned size_range;
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mp_size_t n;
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mp_size_t itch;
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mp_limb_t i_before, i_after, s_before, s_after;
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for (size_min = 1; (1L << size_min) < MIN_N; size_min++)
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;
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/* We generate an in the MIN_N <= n <= (1 << size_range). */
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size_range = size_min
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+ gmp_urandomm_ui (rands, SIZE_LOG + 1 - size_min);
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n = MIN_N
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+ gmp_urandomm_ui (rands, (1L << size_range) + 1 - MIN_N);
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mpn_random2 (dp, n);
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mpn_random2 (ip-1, n + 2);
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i_before = ip[-1];
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i_after = ip[n];
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itch = mpn_invert_itch (n);
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ASSERT_ALWAYS (itch <= mpn_invert_itch (MAX_N));
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mpn_random2 (scratch-1, itch+2);
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s_before = scratch[-1];
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s_after = scratch[itch];
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dp[n-1] |= GMP_NUMB_HIGHBIT;
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mpn_invert (ip, dp, n, scratch);
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if (ip[-1] != i_before || ip[n] != i_after
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|| scratch[-1] != s_before || scratch[itch] != s_after
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|| ! invert_valid(ip, dp, n))
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{
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printf ("ERROR in test %d, n = %d\n",
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test, (int) n);
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if (ip[-1] != i_before)
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{
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printf ("before ip:"); mpn_dump (ip -1, 1);
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printf ("keep: "); mpn_dump (&i_before, 1);
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}
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if (ip[n] != i_after)
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{
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printf ("after ip:"); mpn_dump (ip + n, 1);
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printf ("keep: "); mpn_dump (&i_after, 1);
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}
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if (scratch[-1] != s_before)
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{
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printf ("before scratch:"); mpn_dump (scratch-1, 1);
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printf ("keep: "); mpn_dump (&s_before, 1);
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}
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if (scratch[itch] != s_after)
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{
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printf ("after scratch:"); mpn_dump (scratch + itch, 1);
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printf ("keep: "); mpn_dump (&s_after, 1);
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}
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mpn_dump (dp, n);
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mpn_dump (ip, n);
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abort();
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}
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}
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TMP_FREE;
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tests_end ();
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return 0;
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}
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