125 lines
3.8 KiB
C
125 lines
3.8 KiB
C
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/* Test mpn_mulmod_2expm1
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Copyright 2009 Jason Moxham
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This file is part of the MPIR Library.
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The MPIR Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License, or (at
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your option) any later version.
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The MPIR Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the MPIR Library; see the file COPYING.LIB. If not, write
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to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "mpir.h"
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#include "gmp-impl.h"
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#include "tests.h"
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#define DISP(xp,xn) \
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do { \
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int __t; \
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printf("%s=", #xp); \
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for(__t = (xn) - 1; __t >= 0; __t--) \
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printf("%lX ", (xp)[__t]); \
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printf("\n"); \
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} while(0)
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int
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main (void)
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{
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unsigned long bp, xn, n, b, zn, c;
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gmp_randstate_t rands;
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int qpn, j, k, i, l, i1, k1, j1, i2, k2, j2;
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mp_limb_t xp[10000], dp[10000], qp[10000], yp[10000], rp[10000], zp[10000],
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tp[10000];
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tests_start ();
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gmp_randinit_default (rands);
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for (b = 1; b < 600; b++)
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{
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xn = BITS_TO_LIMBS (b);
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k = xn * GMP_NUMB_BITS - b;
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MPN_ZERO (dp, xn);
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mpn_com_n (dp, dp, xn);
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dp[xn - 1] &= GMP_NUMB_MASK >> k; /* dp is 2^b-1 */
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for (c = 0; c < 5 * b; c++)
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{
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mpn_rrandom (xp, rands, xn);
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mpn_rrandom (yp, rands, xn);
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xp[xn - 1] &= GMP_NUMB_MASK >> k;
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yp[xn - 1] &= GMP_NUMB_MASK >> k;
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mpn_mul_n (zp, xp, yp, xn);
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zn = xn * 2;
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MPN_NORMALIZE (zp, zn);
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if (zn >= xn)
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{
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mpn_tdiv_qr (qp, rp, 0, zp, zn, dp, xn);
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}
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else
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{
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MPN_COPY (rp, zp, xn);
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}
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mpn_mulmod_2expm1 (tp, xp, yp, b, qp);
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if (mpn_cmp (tp, dp, xn) == 0)
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MPN_ZERO (tp, xn); /* fully reduce */
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if (mpn_cmp (tp, rp, xn) != 0)
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{
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printf ("mpn_mulmod_2expm1 error %ld\n", b);
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abort ();
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}
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}
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}
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for (b = MULMOD_2EXPM1_THRESHOLD * GMP_NUMB_BITS;
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b < 2 * MULMOD_2EXPM1_THRESHOLD * GMP_NUMB_BITS; b += 2)
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{
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xn = BITS_TO_LIMBS (b);
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k = xn * GMP_NUMB_BITS - b;
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MPN_ZERO (dp, xn);
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mpn_com_n (dp, dp, xn);
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dp[xn - 1] &= GMP_NUMB_MASK >> k; /* dp is 2^b-1 */
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for (c = 0; c < 5; c++)
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{
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mpn_rrandom (xp, rands, xn);
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mpn_rrandom (yp, rands, xn);
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xp[xn - 1] &= GMP_NUMB_MASK >> k;
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yp[xn - 1] &= GMP_NUMB_MASK >> k;
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mpn_mul_n (zp, xp, yp, xn);
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zn = xn * 2;
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MPN_NORMALIZE (zp, zn);
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if (zn >= xn)
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{
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mpn_tdiv_qr (qp, rp, 0, zp, zn, dp, xn);
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}
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else
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{
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MPN_COPY (rp, zp, xn);
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}
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mpn_mulmod_2expm1 (tp, xp, yp, b, qp);
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if (mpn_cmp (tp, dp, xn) == 0)
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MPN_ZERO (tp, xn); /* fully reduce */
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if (mpn_cmp (tp, rp, xn) != 0)
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{
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printf ("mpn_mulmod_2expm1 error %ld\n", b);
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abort ();
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}
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}
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}
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gmp_randclear (rands);
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tests_end ();
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exit (0);
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}
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