Return to mul_siui.c CVS log

Up to [local] / OpenXM_contrib / gmp / mpz

Annotation of OpenXM_contrib/gmp/mpz/mul_siui.c, Revision 1.1.1.1

1.1       maekawa     1: /* mpz_mul_ui/si (product, multiplier, small_multiplicand) -- Set PRODUCT to
                      2:    MULTIPLICATOR times SMALL_MULTIPLICAND.
                      3:
                      4: Copyright (C) 1991, 1993, 1994, 1996, 2000 Free Software Foundation, Inc.
                      5:
                      6: This file is part of the GNU MP Library.
                      7:
                      8: The GNU MP Library is free software; you can redistribute it and/or modify
                      9: it under the terms of the GNU Lesser General Public License as published by
                     10: the Free Software Foundation; either version 2.1 of the License, or (at your
                     11: option) any later version.
                     12:
                     13: The GNU MP Library is distributed in the hope that it will be useful, but
                     14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     16: License for more details.
                     17:
                     18: You should have received a copy of the GNU Lesser General Public License
                     19: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     21: MA 02111-1307, USA. */
                     22:
                     23: #include "gmp.h"
                     24: #include "gmp-impl.h"
                     25:
                     26:
                     27: #ifdef OPERATION_mul_ui
                     28: #define FUNCTION              mpz_mul_ui
                     29: #define MULTIPLICAND_UNSIGNED unsigned
                     30: #define MULTIPLICAND_ABS(x)   x
                     31: #else
                     32: #ifdef OPERATION_mul_si
                     33: #define FUNCTION              mpz_mul_si
                     34: #define MULTIPLICAND_UNSIGNED
                     35: #define MULTIPLICAND_ABS(x)   ABS(x)
                     36: #else
                     37: Error, error, unrecognised OPERATION
                     38: #endif
                     39: #endif
                     40:
                     41:
                     42: void
                     43: #if __STDC__
                     44: FUNCTION (mpz_ptr prod, mpz_srcptr mult,
                     45:           MULTIPLICAND_UNSIGNED long int small_mult)
                     46: #else
                     47: FUNCTION (prod, mult, small_mult)
                     48:      mpz_ptr prod;
                     49:      mpz_srcptr mult;
                     50:      MULTIPLICAND_UNSIGNED long int small_mult;
                     51: #endif
                     52: {
                     53:   mp_size_t size = mult->_mp_size;
                     54:   mp_size_t sign_product = size;
                     55:   mp_limb_t cy;
                     56:   mp_size_t prod_size;
                     57:   mp_ptr prod_ptr;
                     58:
                     59:   if (size == 0 || small_mult == 0)
                     60:     {
                     61:       prod->_mp_size = 0;
                     62:       return;
                     63:     }
                     64:   size = ABS (size);
                     65:
                     66:   prod_size = size + 1;
                     67:   if (prod->_mp_alloc < prod_size)
                     68:     _mpz_realloc (prod, prod_size);
                     69:
                     70:   prod_ptr = prod->_mp_d;
                     71:
                     72:   cy = mpn_mul_1 (prod_ptr, mult->_mp_d, size,
                     73:                   (mp_limb_t) MULTIPLICAND_ABS (small_mult));
                     74:   if (cy != 0)
                     75:     {
                     76:       prod_ptr[size] = cy;
                     77:       size++;
                     78:     }
                     79:
                     80:   prod->_mp_size = ((sign_product < 0) ^ (small_mult < 0)) ? -size : size;
                     81: }